Quartz powder special flash dryer-Fornitore globale

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Quartz powder special flash dryer

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User: A large enterprise in Shangluo

Material Name: Quartz Powder
Material moisture content: 35%
Dry product moisture content: 0.5%
Material fineness: 500 mesh
Heat source: electric heating
Dry product yield: 1500-2000kg/h
Equipment selection: XZG-16
The company used to use a set of microwave drying machines, but the energy consumption of the entire equipment was too high to meet the production capacity. After multiple exchanges and communications between the technical personnel of both parties, and bringing materials to our company for sample experiments, * * * finally chose this set of rotary flash drying machines. Due to the high environmental requirements of the local chemical zone, we discussed with the other party's client to use electric heating for the heat source part to meet the energy-saving and emission reduction requirements. This material requires a high inlet and outlet air temperature, so a requirement has been made for the temperature of exhaust emissions. Our company has used the temperature of exhaust gas to make a recovery device, fully utilizing the temperature of exhaust gas for secondary drying. With the efforts of our technical personnel, the equipment trial passed in one go, and the operating cost of the entire equipment was reduced by one-third compared to previous equipment, and the output also increased significantly.

flash dryerIt is one of the rapidly developing and widely used drying machines, also known as cyclone dryer or rotary fast dryer in China. The flash dryer organically combines fluidization, swirling, spraying, crushing, and grading technologies, and is an optimized combination of fluidization technology, swirling technology, spraying technology, and convective heat transfer technology. The equipment has high technical content and is suitable for drying paste like, granular, filter cake like, and slurry like materials. Flash drying machine has the advantages of high thermal efficiency, short drying time, and good energy-saving effect. The paste like materials can be directly dried to produce powdered dried products, saving the processes of pre-treatment before drying, crushing and screening after drying. Due to the fast drying speed and short heating time of the material, it is not easy to damage the components of the dried material, which is particularly beneficial for drying heat sensitive materials. The drying process is fully enclosed, with no impurities mixed in, resulting in high-quality finished products and a good operating environment. At present, various models of flash dryers have been designed according to different materials, and a series of products have been formed, which are increasingly widely used in industries such as chemical, pharmaceutical, light industry, food, and mining.

Typical dry materials include:

Inorganic substances: borax, calcium carbonate, hydroxides, copper sulfate, iron oxide, barium carbonate, magnesium sulfate, antimony trioxide, various heavy metal salts, synthetic cryolite, magnesium carbonate, aluminum oxide, aluminum hydroxide, white carbon black, etc

Organic compounds: atrazine (pesticide insecticide), lauric acid, benzoic acid, benzoic acid, fungicide, sodium oxalate, cellulose acetate, etc;

Ceramics: kaolin, silica, clay, etc;

Dyes: anthraquinone, black iron oxide, indigo pigment, butyric acid, titanium hydroxide, zinc sulfide, various azo dye intermediates.

Food categories: soy protein, gelatinous starch, distiller's grains, wheat sugar, wheat starch, etc.

Pesticides, industrial waste, and so on

At present, rotary flash dryers produced by general drying equipment manufacturers generally have the following problems: large one-time investment, high energy consumption, relatively small output, and time-consuming and labor-intensive equipment debugging. Even if the drying system is currently in operation, it is unknown whether it is operating in the best condition, which results in poor economic efficiency and waste. In response to these factors, our Yanling drying technicians have long identified the following two main reasons: firstly, the reasonable configuration of the system, such as measuring the quality and heat of different materials and production requirements, determining heat, air volume, temperature, etc; Secondly, how to improve the construction of the host for different materials and system configurations. By solving these two issues, the output can be further increased, thereby improving efficiency and achieving the goal of energy conservation. At present, flash evaporation dryer and airflow dryer are our company's main characteristic products.

working principle:
The clean air heated by the heat exchanger is blown into the air inlet and spun into the annular gap at the bottom of the drying chamber at a suitable speed. It then enters the drying chamber in a tangential direction and rises in a spiral shape. At the same time, the material is quantitatively added to the tower by a continuously variable speed feeder. In the drying tower, the material undergoes sufficient and efficient mass heat conversion with hot air. The dried powdered material is transported to the separator along with the hot air, where the finished product is collected and packaged, while the exhaust gas is further processed by the dust removal device and discharged.
At the bottom of the drying tower, there is a snail shell type air distributor and agitator, and the speed of the agitator is infinitely regulated by adjusting the speed of the external motor. The agitator has two functions: it can drive the hot air entering the drying chamber from the distribution chamber to generate a high-speed rotating airflow, thereby forming a stable fluidized bed layer and avoiding unstable fluidization such as jetting and surging caused by local blockage; Secondly, due to the high-speed rotation of multiple sets of blades on the mixer, large pieces of material are continuously crushed, causing the particles that are dry on the outside and wet on the inside to be constantly wrapped, peeled off, and crushed. The surface is constantly updated, increasing the heat exchange area and strengthening the mass and heat exchange, thus improving the drying rate. In addition, the gap between the blades on the mixer and the wall of the drying tower is extremely small, and the materials adhered to the wall should be cleaned up in a timely manner to prevent the materials from staying for a long time and deforming. To ensure the invariant decomposition of materials, a cooling jacket is installed inside the tower wall, which can guarantee the quality of thermosensitive materials. The volute shaped air distributor ensures that the tangential hot air uniformly passes through the bottom annular gap and rises in a spiral shape. The reasonable annular gap wind speed ensures good fluidization and drying of the material.
In the middle of the drying tower, a continuously variable speed quantitative feeder continuously adds materials. At the same time, the material is crushed by the bottom mixer and then blown up by high-speed rotating hot air, forming a relatively stable fluidized layer in the drying chamber. There is a rapid and sufficient exchange of heat and moisture between materials and hot air, with most of the water evaporating during this process. Material particles with high moisture content and smaller surface area settle in the drying chamber due to their gravity being greater than buoyancy. During the sinking process, they continuously dry and move to the bottom, where they are further crushed and dried by the blades and the impact of high-speed airflow. At this point, their gravity is less than buoyancy, and the particles begin to rise.
At the upper part of the drying chamber, there is a circular baffle, also known as a classifier. The material is carried up by the rotating airflow. Due to centrifugal force, large blocks of material that do not meet the moisture requirements (i.e. have a higher specific gravity) are subjected to centrifugal force, and their rotation radius increases. When their rotation radius is greater than the radius of the classifier, they are blocked in the drying chamber for further drying and crushing until they meet the requirements before overflowing. After being dried in the middle of the drying chamber, the finer crushed material rises with the airflow. Due to its small particle size and meeting the moisture requirements (i.e. low specific gravity), the centrifugal force is relatively small, and its rotation radius is smaller than the classifier radius. It is then discharged with the airflow and sent to the collection device.

Equipment features:
1. An inner cone structure is installed at the bottom of the drying chamber to continuously increase the cross-sectional area of the dryer gas flow from bottom to top. The gas velocity at the bottom is relatively high, while the gas velocity at the top is relatively low, ensuring that the large particles at the bottom are in a fluidized state while the small particles at the top are also in a fluidized state. The inner cone structure also shortens the length of the cantilever part of the mixing shaft, thereby increasing the reliability of operation. In addition, this structure can effectively prevent the bearings from working in harsh conditions in high-temperature areas, thereby extending the service life of the bearings.
2. Install a scraper on the mixing teeth. While the material is being rotated and crushed by the stirring teeth, it is also thrown towards the wall and stuck to the surface. If the material stuck to the wall is not scraped off in time, serious "scarring" phenomenon will occur, leading to abnormal operation. Installing a scraper on the stirring teeth can ensure that the material is peeled off before it is firmly bonded to the wall.
3. A grading ring is installed at the top of the drying room. Its main function is to separate and block materials with larger particles that have not yet dried, and continue drying to ensure that the product meets the requirements of narrow particle size distribution and uniform moisture content.
4. Install a cooling jacket at the hot air inlet of the cone bottom. At the point where the hot air comes into contact with the material, the temperature is very high, usually close to the temperature of hot air, far higher than the temperature in the bed. During operation, it is inevitable that a small amount of material will bond near the annular gap, stay for too long, and cause material deterioration or even melting. To avoid this phenomenon, a local jacket can be added to reduce the temperature of the wall at this location, allowing the operation to proceed smoothly.

Due to the structural characteristics of the flash dryer, its performance has the following advantages compared to other dryers:
1. High drying strength. Due to centrifugation, shear, collision, and friction, the material is atomized and highly dispersed, resulting in a high relative velocity between the gas-solid phases, which enhances mass and heat transfer.
2. Suitable for heat sensitive materials. The high temperature zone at the bottom of the dryer has a high gas velocity, making it difficult for the material to come into direct contact with the hot surface; In addition, it is equipped with a cooling jacket and a mixing gear matching plate, which solves the problems of material sticking to the wall and coking.
3. Simplify the process. Compared with using other types of dryers, using a flash dryer to dry paste like, slurry like, filter cake and other materials can dry them into uniform powder products in one go, eliminating processes such as crushing and screening.
4. Effectively control the final moisture content and fineness. The adjustment of feed and hot air temperature, as well as the coordination and unity of the classifier, can fully control the final moisture content and finished product particle size, thereby ensuring the uniform moisture content and fineness of the product.

Changzhou Yanling Drying Friendly Reminder -14 Points to Pay Attention to when Choosing a Fast Rotating Flash Drying Machine

1. Physical and chemical properties of materials that require drying
The form, moisture content, water properties, crystal water, particle size, bulk density, viscosity, thermal sensitivity, softening point, phase transition point, thixotropy, toxicity, corrosiveness, odor, flammability, explosiveness, electrostatics, breathability, agglomeration, and easy pulverization of crystals or particles of materials can all affect the drying effect

2. Drying characteristics of materials
The drying curve, critical moisture content, and equilibrium moisture content under the selected drying conditions.
3. Dry production requirements and long-term planning.
4. The impact of material commodity value and drying effect on it. Such as product moisture, pollution, temperature, wear, pulverization, pulverization, rehydration The impact on the value of goods.
5. Requirements for material recovery rate.
6. The top-down process of material drying. (Related to the state method of feeding and discharging)
7. Drying methods for materials in the past or similar products.
8. Available heat sources (coal, fuel oil, electricity, coal gas, liquefied gas, natural gas)
9. Are there any special requirements for the size of the installation site for the rotary flash dryer.
10. Environmental requirements - for dust emissions, noise, vibration, odors, volatile substances Restrictions on waiting.
11. Possible amount of procurement funds, local labor, land, and energy prices.
12. The operator level and maintenance ability of the dryer user.
13. Local environmental temperature and humidity
This mainly refers to the impact of weather changes on drying, generally flash drying machinesAll of them use atmospheric heating as the drying medium. The higher the temperature of the atmosphere and the lower the humidity, the more favorable it is for drying. However, in the southern spring and summer, when the weather is humid and the air humidity is high, it is not conducive to the ability of the dryer and affects the yield.
Our country has a vast territory, and there is a significant difference in air humidity between the north and south. In some parts of the south, the humidity in winter is only 0.008kg water/kg dry air, while in spring and summer, the atmospheric humidity can reach as high as 0.025kg water/kg dry air, which is more than three times higher than the former. Therefore, hot air drying operated at lower exhaust temperatures (<90 ℃) will inevitably decrease its drying rate and increase the required time as the atmospheric humidity increases in spring and summer. Due to the increase in atmospheric humidity, the equilibrium water content of materials will inevitably increase, which will lead to a decrease in drying yield, and in some cases, the yield will decrease by more than 50%.
14. Impact on flash evaporation dryerFactors affecting production capacity
Due to the same drying method, the heat energy consumed for drying and dehydrating one kilogram is basically the same, and the capacity of the heat source (hot air stove, steam radiator, etc.) matched with the dryer is also certain. Therefore, the main technical indicator of the dryer - drying capacity - is often based on the amount of water removed per hour (or * * * large amount of water removed). This indicator is measured under certain conditions, such as the type of wet material, initial moisture content, final moisture content, hot air temperature, environmental temperature and humidity, etc. Any change in one of the conditions will have an impact on the production capacity of the dryer, sometimes even more significant. Below are separate explanations.
(1) Types of wet materials
The type of wet material refers to the combination of material and moisture. Wet materials can be divided into ① capillary porous materials, where water is mainly bound to the material by capillary force, such as sand, silica, activated carbon, plain fired ceramics, etc. The bonding strength between water and the material is relatively small, making it easier to dry; ② Colloidal materials are dominated by the permeation and binding of water and materials, such as glue, flour balls, etc. These materials generally exhibit high viscosity, strong binding strength between water and materials, and difficult drying; ③ Capillary porous colloidal materials have the properties of the two types of substances mentioned above, such as mud coal, clay, wood, fabric, grain, leather, etc. There are many types of these materials, but the form of water binding between them also varies. The difficulty of dehydration under the same conditions is determined by the Tongluo factory.
The form of materials also has a significant impact on drying, such as granular materials, where larger particles are more difficult to dry than smaller particles, while larger particles, with smaller thickness, are easier to dry than larger ones.
(2) Moisture content of wet materials
Moisture content refers to the percentage of moisture in the total weight of wet materials.
In the formula: W - moisture weight;
G - Weight of wet material;
G0- Absolute dry material weight.
The initial moisture content refers to the moisture content of the wet material before entering the dryer. Generally, as long as the wet material can work inside the dryer, the higher the initial moisture content, the more fully the dehydration capacity exhibited by the dryer. On the other hand, the higher the initial moisture content and the constant final moisture content, the greater the dehydration capacity of the dryer, but the amount of dry material discharged actually decreases.
(3) * * * Final moisture content
Generally, the drying stage is in the deceleration stage after drying, and the lower the final moisture content required, the greater the difficulty of drying, the longer the required drying time, and the lower the thermal efficiency, which also affects the yield.
(4) Hot air temperature
Hot air temperature, also known as drying medium temperature, is a sensitive top pipe condition during drying. The higher the temperature of the hot air, the more thermal energy it contains, and the lower the relative humidity of the hot air, the stronger its ability to absorb and carry moisture, which is very beneficial for drying, and the drying thermal efficiency is also high. In many drying equipment, when other conditions remain constant, the dehydration capacity of the dryer is basically proportional to the change in hot air temperature. When choosing a drying equipment, it is important to have sufficient data on the maximum temperature at which the material will be damaged. If the material allows, try to choose a high-temperature medium. It should be noted that many drying methods, especially rapid drying, result in material temperatures that are significantly lower than the temperature of the drying medium. For example, although the hot air temperature of an airflow dryer can reach over 250 ℃, the discharge temperature is generally below 60 ℃.

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