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Classification：Agricultural and sideline products industry:  Case Introduction: Pistachio vacuum harrow dryer adopts sandwich and internal stirring heating mode at the same time, with large heat transfer surface and high thermal efficiency; the machine is set to stir, so that the material forms a continuous cycle state in the cylinder, which further improves the uniformity of the material heating; the machine is set to stir, so that it can be used to smoothly dry slurry, paste and paste-like materials.   I. Pistachio Material Overview: Pistachio is also known as “no name”. Pistachio material overview: Pistachios, also known as “no-name seeds”, are similar to white nuts, but are different from them in that they are cracked and have slits. Pistachios are rich in vitamins, minerals and antioxidants, with low fat, low calorie, high fiber characteristics, is a wise choice for health. It is mainly produced in Syria, Iraq, Iran, southwestern former Soviet Union and southern Europe. Xinjiang, China is also cultivated, pistachio is suitable for normal growth in the region, and has a good economic benefit, at the same time can be used as an excellent soil and water conservation species.   II. Pistachio vacuum harrow dryer features: 1. The machine adopts sandwich and internal stirring heating mode at the same time, large heat transfer surface, high thermal efficiency; 2. The machine is set to stir, so that the material in the cylinder to form a continuous cycle of the state, and further improve the uniformity of the material heated; 3. The machine is set to stir, so that it can be smoothly carried out slurry, paste, paste-like material drying.   III. Vacuum harrow dryer scope of application: 1. Pharmaceutical, food, chemical and other industries for the following materials drying; 2. For slurry, paste paste, powdery materials; 3. Requirements for low-temperature drying of heat-sensitive materials; 4. Easy to oxidize, easy to explode, a strong stimulus, highly toxic materials; 5. Requirement for the recovery of organic solvents of the material.

Abstracts: In the chemical production process of biopharmaceuticals, organophosphorus pesticides, petrochemical refining, heavy metal smelting and other chemical production processes will produce a large number of high-salt wastewater, which often contain a variety of toxic substances and ultra-high pH, for such high COD, high-salt wastewater, effective measures must be taken to deal with. Otherwise, it will cause serious environmental pollution. Therefore, for the chemical production of a variety of high-salt wastewater, the need for.    In the chemical production process of biopharmaceuticals, organophosphorus pesticides, petrochemical refining, heavy metal smelting and other chemical production processes will produce a large number of high-salt wastewater, which often contain a variety of toxic substances and ultra-high pH, for such high COD, high-salt wastewater, effective measures must be taken to deal with. Otherwise, it will cause serious environmental pollution. Therefore, for all kinds of high salt wastewater produced in chemical production, it is necessary to classify and select the optimal process according to the different sources and properties of high salt wastewater. Our company for such high COD, high salt wastewater treatment to achieve technological breakthroughs, high salt wastewater drying experiments with drum scraper dryer, successfully tested a variety of miscellaneous salt wastewater, to solve the process of high salt wastewater disposal in the field of pain points.   In order to overcome the shortcomings of the existing technology, our company provides a solid waste salt chemical wastewater reduction drying treatment method, the method of new materials, chemical, petrochemical, chemical water, recycled water and other systems of high salt wastewater through the MVR continuous concentration and evaporation of salt concentration produced through the drum dryer direct evaporation treatment. The method contains sodium sulfate and sodium chloride and other mixtures of chemical impurity salt wastewater as raw materials, the use of drum dryer evaporation and drying off impurity salt solidification, evaporation of water and gas in the water shower tower dust removal and discharge. Both combined with the characteristics of solid waste heterosalt resources, but also make full use of chemical resources, reducing the disposal of heterosalt wastewater link, the large mass of wastewater reduction and drying, compared with the traditional high salt wastewater treatment system, the treatment volume can be reduced by 50% to 70%, the equipment energy consumption can be reduced by 50% to 80%, and the energy costs reduced by 30% to 60%.    Through the high salt wastewater reduction drying technology, saving the enterprise wastewater disposal costs, not only make full use of chemical resources, but also to achieve the true meaning of the chemical plant wastewater treatment system “zero discharge”.

Abstracts: Pressure Spray Dryer for Large Granular Products Our pressure spray dryer is a drying device with two types of gas-liquid countercurrent or parallel flow. It adopts high-pressure pump or high-pressure blast to atomize the liquid material and make it flow with hot air synchronously, so as to produce granular products in a short time. Performance characteristics: – Simple nozzle, low atomization power, easy to operate and maintain – Suitable for drying low viscosity liquid materials – Can… Pressure Spray Dryer Large Particle Products   Our pressure spray dryer is a kind of gas-liquid countercurrent or parallel flow two kinds of drying device. It adopts high-pressure pump or high-pressure blast to atomize the liquid material and make it flow with hot air synchronously, so as to produce granular products in a short time. Performance Characteristics:   -Simple nozzle, low atomization power, easy operation and maintenance   Applicable to the drying of low-viscosity liquid materials   -Can produce large particle size products to meet the requirements of granulation process.   -Applicable to heat-sensitive materials As a professional manufacturer of Pressure Spray Dryer, we have advanced production technology, a professional staff team and strict control of product quality. Therefore, consumers can rest assured to buy pressure spray dryer from our factory.

Each kind of drying equipment has a specific scope of application, and each kind of material can find several kinds of drying equipment that can satisfy the basic requirements, but there is only one most suitable one. If the selection is not appropriate, the user not only has to bear the unnecessary one-time high procurement cost, but also has to pay the heavy price of the whole service life, such as low efficiency, high energy consumption, high operating costs, poor product quality, and even the equipment can not run normally at all. …   The following are the principles of drying equipment selection, it is difficult to say which one or which ones are the most important, the ideal selection must be focused according to their own conditions, sometimes compromise is necessary.  1. Applicability – drying equipment must be suitable for specific materials, to meet the basic requirements for the use of material drying, including good handling of materials (feeding, conveying, fluidization, dispersion, heat transfer, discharge, etc.). And to meet the basic requirements of processing capacity, dehydration and product quality.  2. High drying rate – as far as drying rate is concerned, the material is highly dispersed in the hot air when convective drying, the critical moisture content is low, the drying speed is fast, also convective drying. Different drying methods have different critical moisture content and different drying rate.  3. Low energy consumption – different drying methods have different energy consumption indexes.  4. Saving investment – to complete the same function of the drying equipment, sometimes the cost difference is big, should choose the low.  5. Low running cost – equipment depreciation, energy consumption, labor cost, maintenance cost, spare parts cost and other running costs as cheap as possible.   6. Priority should be given to the drying equipment with simple structure, sufficient supply of spare parts, high reliability and long service life.  7. Meet the requirements of environmental protection, good working conditions, high security.  8. It is better to make the drying experiment of the material before selecting the type, and deeply understand the drying equipment that has been used for the similar material (advantages and disadvantages), which is often helpful for the proper selection.   9. Do not completely rely on past experience, pay attention to the absorption of new technologies, listen to the views of experts.

Abstracts:   Spray drying encapsulation process used for microcapsules is quite different from the fluidized bed process. In spray drying for encapsulation, we turn the liquid into powder form. Unlike the fluidized bed method, spray drying does not produce complete microcapsules. We are not building shells or matrices on the outside of the particles. Instead, the spray drying process forms a dispersion or emulsion of one ingredient in another and then… Spray Drying Encapsulation Process Spray drying for microencapsulation is very different from the fluidized bed process. In spray drying for encapsulation, we turn a liquid into a powder.  Unlike the fluidized bed method, spray drying does not produce complete microcapsules. We are not building shells or matrices on the outside of the particles. Instead, the spray drying process forms a dispersion or emulsion of one ingredient in another, and then dries that emulsion very quickly. There will always be some active ingredient on the outer surface of the resulting dried particles, while the inner core is more protected.   Differences in Spray Drying Encapsulation Processes:  * The spray drying process effectively turns liquids into powders.  *Spray drying starts with an emulsion or dispersion. *Spray dried materials are not fully encapsulated.   Above is a brief introduction about spray drying encapsulation process, hope it can help you! If you want to order spray dryer, please feel free to contact us.

  Spray Dryer Key Components What is a spray dryer? As we can see from the name, it is a device that uses spray for drying. A spray dryer mixes a heated gas with a stream of atomised (sprayed) liquid in a vessel (drying chamber) to accomplish evaporation and produce a free-flowing dry powder with a controlled average particle size.   Spray dryer operation includes the following key components:   *A device to atomise the solution or slurry   *Air/gas heater or source of hot air, e.g. exhaust gas   *Gas/mist mixing chamber with sufficient residence time and droplet trajectory distance for heat and mass transfer   *Apparatus for recovering solids from the gas stream   *Fans to direct the required air/gas through the spray drying system     These are the key components of a spray dryer, do you understand them? If you want to know more about spray dryer, please contact us, we have professional staff for you!

Abstract: Milk powder centrifugal spray dryer In the process of milk powder production, why is centrifugal spray dryer the right choice? If you want to know the specific reason, let’s discuss it with the editor. The reasons are as follows: 1. The drying speed is fast. After the material liquid is atomized, its surface area increases significantly. When it comes into contact with hot air, it can instantly evaporate 95%-98% of its water. Milk spray drying time only takes a few seconds, so high-speed centrifugal spray…   Milk powder centrifugal spray dryer： In the process of milk powder production, why high-speed centrifugal spray dryer Is it the right choice? If you want to know the specific reason, let’s discuss it with the editor. The reasons are as follows: 1.The drying speed is fast. After the liquid is atomized, its surface area increases significantly. When in contact with hot air, it can instantly evaporate 95%-98% of its water. The milk spray drying time only takes a few seconds, so the high-speed centrifugal spray dryer is especially suitable for milk powder production. 2. Spray drying products have good uniformity, fluidity and solubility, high purity of powder or particles, and excellent quality. 3. The production process is simple, easy to operate and easy to control. For liquids with a water content of 40%-60% (special materials can reach 90%), they can be sprayed into powder or granules at one time. After drying, there is no need to crush and screen, which reduces the milk production process and improves the purity of milk powder. 4. By changing the operating conditions of the centrifugal spray dryer, the particle size, weight and moisture of the spray drying products can be adjusted, and the control and management are very convenient. Now, I believe everyone can understand why they chose the milk powder centrifugal spray dryer. If you have any requirements for centrifugal spray dryers, please contact us.

Abstract:  Dryers that can realize a variety of industrial applications When the factory needs to convert liquid materials into granular powder, the factory will use a spray dryer for daily processing. At the same time, the machine is completed by using hot air flow to quickly dry the liquid solution, so the machine can achieve a variety of industrial applications. Usually, the liquid material will enter the machine at the input port, and the liquid material will be atomized into air flow, and then…   A dryer that can realize a variety of industrial applications When the factory needs to convert the liquid material into granular powder, the factory will use a spray dryer for daily processing. At the same time, the machine is completed by using hot air flow to quickly dry the liquid solution, so the machine can achieve a variety of industrial applications. Usually, the liquid material will enter the machine at the input port, and the liquid material will be atomized into air flow, and then the machine will dry it quickly. In this process, the liquid material will become a single particle. At the same time, the smaller particles will be discharged from the discharge port at the bottom, while the larger particles will be left in the machine, knowing that the size of the particles meets the standard.   At the same time, the machine can effectively control and maintain the quality and performance of the product during the processing process, and the simple operating system enables the machine to continuously produce high-tonnage products. Therefore, this machine is widely used in the biochemical industry, environmental pollution control and other industries, and is well received by the industry.

Abstract: When constructing and welding near the enamel equipment, care should be paid to covering the pipe mouth to prevent external hard objects or welding slag from damaging the porcelain layer; personnel entering the tank to inspect and install accessories should wear soft soles or cloth sole shoes (it is strictly forbidden to carry hard objects such as metals with them). The bottom of the tank should be covered with enough cushions, and the cushions should be clean and the area should be large enough. The enamel glass equipment with porcelain layer is not allowed to be welded on the outer wall; in the absence of… 1.When constructing and welding near the enamel glass equipment, care should be paid to cover the pipe mouth to prevent external hard objects or welding slag from damaging the porcelain layer; 2.Personnel entering the tank to inspect and install accessories should wear soft soles or cloth soles (it is strictly forbidden to carry hard objects such as metals with them). The bottom of the tank should be covered with enough cushions, and the cushions should be clean and the area should be large enough.  3. Glass enamel equipment with porcelain layers is not allowed to be welded on the outer wall; when welding on a jacket without porcelain layer, measures must be taken to protect the steel plate with porcelain layer. The adjacent part of the welding should not be overheated locally. Protection measures include not cutting and welding with oxygen. When cutting the opening, the inside of the jacket should be watered. When the welding port is close to the upper and lower rings, the internal porcelain surface should be evenly preheated and welded with interval intermittent welding.

Summary: Spray-dried food is divided into two categories: non-sticky and viscous. Non-sticky ingredients are easy to spray dry, simple dryer design and final powder flow freely. Examples of non-stick materials include egg powder, milk powder, solutions and other maltodextrin, gums and protein. In the case of sticky food, there is a drying problem under normal spray drying conditions. Sticky food usually sticks to the wall of the dryer, or becomes useless sticky food in drying chambers and transportation systems, with low operational problems and product yields. Sugar and acid foods are typical examples.   Viscos is a phenomenon encountered in the drying process of food materials rich in glycolic acid. Powder viscosity is a kind of cohesion adhesion performance. It can explain particle-particle viscosity (cohesion) and particle-wall viscosity (adhesion). The measure of binding force with powder particles is due to its internal characteristics called cohesion, forming masses in the powder bed. Therefore, the force that needs to break through the powder agglomerate should be greater than the cohesion. Adhesion is an interface performance, and the powder particles adhere to the trend of spray drying equipment. Cohesion and adhesion are the key parameters for designing drying and drying conditions. The surface composition of powder particles is mainly responsible for viscosity. The cohesion and adhesion tendency of powder particle surface materials are different. Because drying requires a large amount of solute to be transferred to the particle surface, it is in bulk. Two viscosity characteristics (cohesion and adhesion) can coexist in spray-drying sugar-rich food materials. The viscosity between particles is the formation of fixed liquid bridges, moving liquid bridges, mechanical chains between molecules, and electrostatic gravity and solid bridges. The main reason for the adhesion of wall powder particles in the drying chamber is the loss of materials in spray-drying sugar and acid-rich foods. When the powder is kept for a longer time, it will dry on the wall.   It leads to viscous Spray-rich food drying powder recycling spray drying technology. Low molecular weight sugars are very challenging (glucose, fructose) and organic acids (citric acid, malic acid, tartaric acid). Small molecular substances such as high water absorption, thermoplasticity and low vitrification transition temperature (Tg) contribute to viscosity problems. The spray drying temperature is higher than Tg20°C. Most of these components form soft particles on the viscous surface, causing powder viscosity, and eventually forming a paste structure instead of powder. The high molecular mobility of this molecule is due to its low vitrification transition temperature (Tg), which leads to viscosity problems in spray dryers that are usually popular at temperature. The main characteristics of glass conversion temperature and amorphous phase conversion temperature. The glass transition event occurred in a hard solid, amorphous sugar, which underwent a transformation into a soft rubber liquid phase. Surface energy and solid glass have low surface energy and do not adhere to low-energy solid surfaces. Due to the state of glass to rubber ferry (or liquid), the surface of the material can be raised, and the interaction between the molecule and solid surface can begin. In food drying operations, the product is in a liquid or adhesive state, and the liquid/adhesive food that removes plastic agent (water) becomes glass. If food raw materials do not change from high drying temperature than glassy temperature, the product will maintain high energy viscosity. If this kind of food is touched with a high-energy solid surface, it will stick or adhere to it.

In a breakthrough for industrial drying technology, Rake Vacuum Dryers are gaining traction globally for their ability to efficiently process heat-sensitive, oxidation-prone, and high-viscosity materials. These machines operate under vacuum conditions, reducing evaporation temperatures to preserve material integrity while enhancing drying efficiency.   Key Applications   1.The technology ensures chemical stability by maintaining low temperatures (20–80°C) and vacuum pressures (-0.08 to -0.1 MPa), preventing thermal degradation and oxidation .   2.Pharmaceuticals & Antioxidants: For heat-sensitive drugs and antioxidants (e.g., vitamin E, BHT), these dryers use nitrogen-protected environments and precise temperature control to retain active ingredients. Equipment like Jiangsu Bohong’s model achieves ≥99% activity retention while reducing energy consumption by 30% .   3.Food & Chemicals: In food processing, they dry additives and natural extracts without compromising flavor or nutrients. For chemicals, they handle solvents and hazardous materials safely, with closed-loop systems recovering up to 95% of volatile components . Technical EdgeRake Vacuum Dryers feature automated control systems, adjustable vacuum levels (-0.09 to 0.096 MPa), and customizable heating methods (steam, oil, or infrared). Their rotating rake mechanism ensures uniform mixing, preventing clumping and improving heat transfer efficiency by 40% compared to traditional methods .       Market ImpactWith the global drying equipment market projected to grow at a 5.0% CAGR through 2031 , these dryers are reshaping industries. Their energy efficiency, compliance with FDA/REACH standards, and adaptability to diverse materials (powders, pastes, fibers) position them as a sustainable choice for manufacturers prioritizing quality and environmental responsibility .

The rotary drum dryer mixer offers a multitude of benefits that significantly contribute to enhancing efficiency in industrial applications. Its design and functionality provide advantages that are both immediate and long-term, making it a strategic investment for companies seeking to improve their production processes. Energy Efficiency Energy efficiency is one of the most compelling advantages of the rotary drum dryer mixer. By combining the processes of drying and mixing into a single operation, industries can substantially reduce energy consumption. This reduction not only lowers operational costs but also minimizes the environmental impact of production activities. The machine’s design facilitates optimal heat transfer, ensuring that energy is used effectively and that waste is minimized. Industries that prioritize sustainable practices find the rotary drum dryer mixer to be an indispensable tool in their energy-saving initiatives. Time-Saving In traditional industrial setups, drying and mixing are often separate processes, each requiring its own set of equipment and operational time. The rotary drum dryer mixer eliminates this inefficiency by consolidating these steps into a single, streamlined operation. This time-saving capability allows industries to increase their production output without compromising quality. Faster processing times mean that products can move through the production line more quickly, meeting market demands and enhancing the company’s competitive edge. The reduction in process time also translates into lower labor costs, as fewer personnel are needed to manage the operations. Improved Product Quality The rotary drum dryer mixer excels in delivering consistent and thorough mixing, a critical factor in ensuring product quality. Uniformity in the final product is crucial in industries where quality standards are stringent, such as pharmaceuticals and food processing. The machine’s ability to achieve a homogeneous mix ensures that each batch meets the required specifications, reducing the risk of defects and enhancing customer satisfaction. Furthermore, precise control over drying conditions prevents issues such as overheating or uneven drying, which can compromise product integrity. By maintaining high-quality standards, industries can build a strong reputation and foster customer trust.

Alright, let’s break it down step by step. At its heart, a spin flash dryer works on the principle of sudden exposure to hot air while dispersing the material into fine particles. Here’s what really happens inside: Feeding the Material The process starts when wet material (it could be slurry, paste, or cake) is fed into the dryer. A special feeding system ensures that the material enters in controlled amounts. Breaking and Dispersing Once inside, the material meets a high-speed rotating disperser or agitator. Imagine a powerful blender breaking down lumps and spreading everything evenly. This step ensures the wet feed is instantly broken into smaller, manageable pieces. Contact with Hot Air Hot air is introduced into the drying chamber at high velocity. The dispersed particles come into immediate contact with this hot air. Just like how your hair dries faster under a blow dryer, these particles lose moisture quickly due to the intense airflow. Rapid Moisture Evaporation Because the particles are so small and well-distributed, the moisture inside evaporates almost instantly. This is where the “flash” in spin flash dryer comes from—the drying is nearly instantaneous. Separation of Dry Particles As drying happens, a cyclone separator or bag filter collects the fine dry powder, while the exhaust air is safely discharged. This ensures you get the product in pure, dry form. Why Are Spin Flash Dryers So Popular? Before we get into the nitty-gritty of how they work, let’s pause and look at why they’re so widely used. Speed: Drying happens in seconds, not hours. Versatility: Can handle sticky, heat-sensitive, or paste-like materials. Uniformity: Produces fine, consistent powders. Energy Efficiency: Uses less energy compared to some traditional drying methods. In short, they save both time and money—two things every manufacturer loves.

Steel belt users are very concerned about the service life of steel belts, we have summarized the following points related to the service life of steel belts, hoping to help you better understand our steel belts. Firstly, the steel belt will bear too much stress will affect the service life. What is the best stress for the steel belt? Of course, the less stress the steel belt bears, the longer the life, which should be combined with the needs of users to produce rubber products. Generally speaking, taking MT1650 steel belt application in DLG-700X1400 equipment of Shanghai Rubber Machinery No. 1 Factory as an example, most production users adjust the value of the hydraulic gauge at about 15~20Mpa. In addition, due to the different diameters of the hydraulic cylinders used by the drum vulcanizer to support the extension rollers, the specific values will also be different. Please consult the equipment manufacturer for the specific values indicated by the hydraulic table of the drum vulcanizer. Secondly, many users think that the thicker the steel belt, the longer its lifespan before buying it, which is actually a misunderstanding. Although the thick steel belt can withstand the impact of hard objects in the material and is not easy to produce large pits, the thick steel belt has a large bending curvature radius, which is more sensitive to fatigue damage caused by repeated bending, and the bending stress is larger, so the thicker steel belt may not have a longer service life. In addition, after the installation of the steel belt, it is not advisable to immediately adjust the pressure to the value required for production, and the pressure should be gradually increased until normal operation. The temperature of the steel belt should also be gradually increased to reduce the internal stress deformation caused by thermal expansion and contraction, and the heating device should not be started when the vulcanizer stops running.   Finally, if the following conditions are not paid attention to during use, the steel belt is also prone to damage: 1) Serious damage to the steel belt caused by improper operation. If the rubber material is partially overlapped, foreign objects similar to maintenance tools will enter the drum vulcanizer, resulting in local deformation of the steel strip and leaving traces on the surface of the product. 2) The maintenance interval is too long, and the surface of the steel belt should be cleaned every week. 3) Poor quality of vulcanized raw materials. This is mainly due to excessive local stress caused by hard foreign matter in the raw material. 4) The equipment is not operating properly. For example, the steel belt deviation caused by various reasons leads to the steel belt ruffles. 5) The edge of the steel strip forms an sharp angle, which causes the stress concentration and cracks. 6) The steel belt is poorly cleaned, with foreign objects sticking to the inner surface of the steel belt. 7) The rubber product is narrower than the width of the steel belt, and the edge of the vulcanized rubber product exerts force on the same position of the steel belt for a long time. 8) The amplitude of the manual adjustment roller is too large, or the drum vulcanizer is frequently adjusted.

A disc dryer is a highly efficient and energy-saving conductive continuous drying device. The equipment mainly includes a shell, frame, large and small hollow heating discs, main shaft, rake arms and blades, feeder, unloading device, reducer, and motor. The following examples illustrate the application areas of disc dryers:   I. Drying of Toxic and Easily Escaped Materials   Environmental protection is one of the fundamental national policies. In chemical and related industries, it is common to encounter situations where the dried materials contain toxic substances or have extremely fine particle sizes that escape with the exhaust gas. Without appropriate measures, this will pollute the environment and harm the health of operators. To enable disc dryers to be suitable for drying toxic, harmful, and environmentally polluting materials, as well as easily escaped materials, a bag filter, induced draft fan, and finned heater can be added to the basic configuration of a closed-type disc dryer. This captures trace amounts of extremely fine materials entrained in the exhaust gas, thus protecting the environment, safeguarding the health of operators, and reducing product loss. II. Drying for Materials Requiring Moisture Recovery   In production, drying operations often encounter materials where the moisture is not water, but solvents such as methanol, ethanol, gasoline, pyridine, petroleum ether, halogenated alkanes, acetone, and formaldehyde. The moisture produced during drying is flammable, explosive, or toxic; direct release into the atmosphere is dangerous and unacceptable. Some solvents are expensive, making direct discharge uneconomical. In such cases, the moisture must be recovered. Therefore, based on the basic configuration of a closed-type disc continuous dryer, continuous interlocking devices can be added to the material inlet and outlet to maintain a slight negative pressure operating condition within the dryer. A condenser, solvent recovery tank, and vacuum pump should also be added. During the drying process, the moisture (solvent vapor) escaping from the material enters the condenser through the outlet at the top of the dryer. Under the cooling medium, it condenses into solvent liquid and enters the solvent recovery tank. Non-condensable gases are then extracted and vented by the vacuum pump through the outlet at the top of the solvent recovery tank. III. Drying Materials Requiring Nitrogen Protection For drying materials that are easily oxidized, highly toxic, or particularly flammable and explosive, inert gas must be introduced into the dryer during the drying process to ensure safety and product quality. In this case, in addition to the basic configuration of a closed-loop disc continuous dryer, auxiliary equipment such as a solvent condenser, solvent receiving tank, inert gas circulator, inert gas replenishment tank, and finned heater are required. The process flow is basically the same as that of the solvent recovery type disc continuous dryer, except that the inert gas drawn from the top outlet of the solvent recovery tank is fed back into the disc continuous dryer after passing through the circulator and finned heater, forming a closed-loop circulation of inert gas.   IV. Drying Paste-like and High-Viscosity Materials   Due to the inherent characteristics of disc continuous dryers, they are suitable for drying granular materials, but not for drying paste-like or high-viscosity materials. In such cases, the material easily sticks to the rake blades and drying discs, making the drying operation difficult. However, in production practice, it has been found that some materials become sticky when their moisture content reaches a certain percentage, but become less sticky when the moisture content is reduced to a certain percentage. This suggests the possibility of taking measures to reduce the moisture content of paste-like, filter cake-like, and high-viscosity materials before they enter the disc continuous dryer. This would expand the application range of the disc continuous dryer and provide a new method for drying paste-like and high-viscosity materials. Therefore, the original general feeder needs to be replaced with a special feeder suitable for paste-like and filter cake-like materials. At the same time, a mixer needs to be added to mix the paste-like material with the dried material to form a loose material with a lower moisture content. To achieve this, the discharge port of the disc continuous dryer is changed to two: one for direct packaging of finished products, and the other for sending the dry material to the mixer via a screw conveyor and bucket elevator. During startup, a certain amount of dry material needs to be mixed with the paste-like material, as there is no dry material discharged from the dryer itself at this time. After normal operation, no additional drying material is needed.

The main production methods for titanium dioxide are the sulfuric acid process and the chloride process. The sulfuric acid process involves reacting titanium concentrate or acid-soluble titanium slag with sulfuric acid to undergo acidolysis, yielding a titanium oxysulfate solution. This solution is then hydrolyzed to obtain metatitanic acid precipitate, which is subsequently calcined in a rotary kiln to produce TiO2. The sulfuric acid process is primarily a batch operation, offering high flexibility in production equipment and facilitating start-up, shutdown, and load adjustments.   In recent years, my country's titanium dioxide industry has experienced several-fold growth in capacity, output, and market demand, ushering in a period of prosperity. Simultaneously, the growth rate of rutile titanium dioxide production has also accelerated. Therefore, the selection of drying equipment for titanium dioxide has become paramount, as it is crucial to the quality of the material. Based on the material characteristics of titanium dioxide and the assimilation of advanced foreign equipment and technologies, a domestically developed high-speed rotary flash dryer has been successfully applied in titanium dioxide drying. The flash dryer mainly consists of an air inlet system, a heating system, a feeding system, a drying host, a material collection and dust removal system, an exhaust system, and a control system. During operation, wet material enters the drying chamber via a screw feeder. Inside, the material encounters high-speed rotating hot air. Fine powder is carried upwards by the hot air, while material that cannot be carried falls to the bottom and is broken up by a crushing device. This rapid dispersion increases the contact area between the material and the hot air. Under centrifugal force (with a grading device at the top), products reaching a certain degree of dryness and fineness are blown out of the grading device. The material is rapidly dried in this process.   Flash dryers, as a new type of equipment, offer high thermal efficiency, short drying time, and good energy savings. Currently, the 1400 and 1600 models are commonly used in the titanium dioxide industry. Our company will continue to uphold technological innovation in the titanium dioxide industry, continuously improve its innovation capabilities, and contribute to the sustainable development of the titanium dioxide and drying industries.

The basic principle of fluidized bed drying is to use heated air to blow wet particles into a boiling, convective state. The hot air carries away the evaporated moisture or organic solvent, thus drying the wet particles. This involves the issue of air handling.   Currently, many domestic manufacturers configure their air handling units as follows: pre-filter—electric heating (or steam heating)—fan—medium-efficiency filter—fluidized bed dryer—it's that simple. Clearly, this is highly dependent on user requirements; lower user requirements result in lower manufacturer configurations. Here, we will only take the fluidized bed dryer in GEA's granulation line as an example to discuss the relationship between configuration and energy saving. Air handling unit configuration and parameter requirements:   (1) Inlet air temperature and humidity should be adjustable to the required process parameters: t = 80℃, RH = 20%;   (2) Chilled water cooling and dehumidification: copper tubing and aluminum finned coils; chilled water from the process chilled water system, temperature 7–12℃;   (3) Heater heat source: industrial steam; pressure and temperature consumption requirements should be specified;   (4) Filter: (G4+F8+H13) three-stage filtration; H13 requires PAO leak testing and verification; testing and replacement times should be specified;   (5) Enclosure requirements: the inner wall of the medium-high efficiency section should be... Stainless steel plate, with galvanized steel plate for medium and high efficiency sections; the wall panels have heat insulation and cooling protection functions;   (6) The inlet and outlet of cold water and steam are automatically controlled by PLC electric valves or pneumatic valves according to the set temperature and humidity;   (7) G4, F8, and H13 have differential pressure display devices, and the PLC has a differential pressure alarm function (the differential pressure is not displayed on the PLC);   (8) The filter is easy to replace and disassemble; (9) Equipped with a drain trap for the surface cooler, the water collection tray is made of 304 stainless steel, leak-proof, with smooth drainage and no water accumulation in the collection tray;   (10) The air outlet is equipped with an electric regulating valve, the opening of which can be controlled by the PLC.   These are our requirements for the configuration of the air handling unit (AHU). We believe that many domestic manufacturers can fully meet these requirements. If domestically produced equipment is manufactured according to these requirements, it will definitely reduce the quality risk of pharmaceutical production. Furthermore, with detailed validation documentation, the technical content of the equipment will be further improved.   While meeting GMP requirements, we must also fully consider energy conservation. Energy consumption here involves the defrosting and preheating section, cold water dehumidification, heating section, and maintaining negative pressure within the fluidized bed cylinder. According to the URS, if the defrosting and preheating section is not needed, it can be eliminated; otherwise, it increases investment, airflow resistance, and energy consumption. The cold water dehumidification section and steam heater are automatically controlled by PLC solenoid valves, setting the outlet air temperature and humidity. Conventional fluidized bed drying parameters are d = 11 g/m³ and t = 80℃. The relationship between the fluidized bed's airflow and exhaust volume can be set via PLC through the negative pressure within the cylinder and the automatic adjustment of the inlet and exhaust valves. According to FDA requirements, the three-stage filter in the air conditioning unit is crucial. The main reason for the significant risks associated with domestically produced equipment lies in the filter. Filter selection is very important; the filter specifications must be clearly stated. G4, F8, and H13 must conform to international standards. Using cheap, indiscriminately made non-woven cotton filters will pose a significant quality risk. While standard filters increase airflow resistance, our primary concern is meeting quality requirements.   During fluidized bed operation, the trajectory of the particles inside is closely related to air heat exchange. Currently, air is typically blown up from the bottom, causing the particles to convect. The time the particles remain in the air is the time for moisture to evaporate. GEA's fluidized bed dryer uses fish-scale-shaped air outlets at the bottom, causing the particles to rise in a spiral shape inside the cylinder. This effectively increases the length of the streamlines and the time for heat exchange with the air, making full use of energy.

In flash drying, wet material enters the grinding and drying section of the dryer body via a customized feed system. A grinding rotor disperses the wet material into very fine particles, which are fluidized in the grinding chamber by temperature-controlled hot gas from an air heater.   The hot air (or inert gas) can be heated to 650°C, and its size is reduced at the bottom of the flash dryer as the wet product is dispersed. The system maintains negative pressure via an exhaust fan, significantly increasing the surface area of ​​the product, causing water (or other solvents) to evaporate instantaneously. The dried and fine particles are conveyed with the airflow to the top of the dryer, where a separator classifies the particles by size. The particles then pass through the classifier at a set cut point and are conveyed with the exhaust gas to a dust-air separation system, such as a cyclone separator or cyclone dust collector.   The rotary flash dryer maintains a fluidized bed of product within the drying chamber to ensure low-level adhesion of the wet material to the chamber walls. In addition, process parameters such as classifier speed and outlet temperature can be used to control the moisture content and particle size of the final product.

Spray drying equipment primarily involves introducing hot air at the top of a drying tower. The liquid material to be dried is delivered to the top of the tower and atomized into mist droplets by an atomizer. These droplets rapidly evaporate upon contact with the high-temperature hot air, resulting in a very short drying time. This not only facilitates better drying of materials but also promotes the recovery and utilization of particulate matter carried in the exhaust gas, improving material utilization efficiency.   Currently, spray drying has become a rapidly developing and widely used method in the drying field. It not only dries a wide range of products but also is very simple to operate, enabling automated processing. Different atomizers and airflow patterns are determined by the different drying characteristics of the material, such as its heat sensitivity and viscosity, as well as the size and particle size distribution of the product, providing greater convenience for operators.   A spray drying tower is a thermal process in which liquid materials are atomized into fine mist droplets through nozzles, and then dried into powder upon contact with a hot medium inside the drying tower. The feed can be a solution, suspension, or paste. Atomization can be achieved through rotary atomizers, pressure atomizing nozzles, and airflow atomizing nozzles. Operating conditions and the design of the drying equipment can be selected based on the required drying characteristics and particle size of the product. To meet market demands and improve product solubility, reconstitution, and packaging performance, some spray drying towers incorporate granulation equipment. However, this increases the risk of thermal denaturation and loss of aromatic substances. Spray drying towers effectively solve the problem of integrating the spray drying tower, separation chamber, and cooling chamber. During the falling-rate drying stage of spray drying, the powder temperature rises as the moisture content decreases.   Clean air, after being heated, enters the spray drying tower. Inside the tower, various liquid materials are atomized into tiny droplets using two-fluid (or three-fluid) nozzles. These droplets rapidly exchange with the hot air, evaporating the water (or solvent) in the liquid material, which is then discharged with the hot air, resulting in a powdered or granular product.   Features of Spray Drying Towers   1. Particularly effective for highly viscous, paste-like, and slurry-like materials; other equipment cannot replace it.   2. Experimental models with a wide variety of products; widely applicable low-temperature drying.   3. Spray drying tower nozzles have a simple structure, are easy to maintain, and have low operating costs.

The double-cone rotary vacuum dryer is a new type of dryer that integrates drying and mixing. It combines a condenser and a vacuum pump with the dryer to form a vacuum drying unit (the condenser is optional if solvent recovery is not required). This machine features an advanced design, simple internal structure, easy cleaning, complete material discharge, and simple operation, reducing labor intensity and improving the working environment. Simultaneously, because the material rotates along with the container and no material accumulates on the walls, the heat transfer coefficient is high, and the drying rate is large, saving energy and ensuring uniform and thorough drying of high-quality materials.   The double-cone rotary vacuum dryer is widely used in the production of active pharmaceutical ingredients (APIs). This is because during vacuum drying, the pressure inside the cylinder remains lower than atmospheric pressure, resulting in fewer gas molecules, lower density, and lower oxygen content. Therefore, it can dry pharmaceuticals prone to oxidative changes and reduce the chance of material contamination. Furthermore, since the temperature of water is directly proportional to its vapor pressure during vaporization, the moisture in the material can vaporize at low temperatures during vacuum drying, achieving low-temperature drying, which is particularly suitable for the production of pharmaceuticals containing heat-sensitive materials. Meanwhile, vacuum drying eliminates the surface hardening phenomenon that easily occurs during normal pressure hot air drying. In vacuum drying, the large pressure difference between the inside and surface of the material causes moisture to quickly move to the surface under the pressure gradient, preventing surface hardening. Furthermore, during vacuum drying, the temperature gradient between the inside and outside of the material is small, and reverse osmosis allows the solvent to move and be collected independently, effectively overcoming the solvent loss phenomenon caused by hot air drying.   The vacuum dryer has a steel outer shell with a rectangular or cylindrical cross-section and many hollow partitions inside. Steam or hot water is introduced into the partitions, connecting the hollow partitions to multiple branch pipes. Steam is introduced into the main pipe, and condensate is discharged through the branch pipes. A tray containing the material to be dried is placed on the partitions, the chamber door is closed, and a vacuum pump creates a vacuum inside the chamber. The steam in the partitions gradually heats the material in the tray to the specified temperature, causing the moisture to vaporize under the internal pressure and condense in the condenser. The condenser is installed between the dryer and the vacuum pump. If a J21S-70 water ring vacuum pump is used, the condenser is not required. Vacuum dryers have low heat loss and high thermal efficiency, and the chamber can be pre-sterilized before drying. During the drying process, no impurities are introduced, ensuring the product remains uncontaminated. The dried material remains stationary, minimizing damage to its shape. However, vacuum dryers are more complex to operate, have higher operating costs, and are more structurally complex and expensive to manufacture.