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Help CenterPotato Starch Rotary Flash Dryer, Compact Structure, Large Processing Capacity
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Overview of Rotary Flash Dryer Equipment:
The flash dryer (also known as rotary flash dryer or instantaneous dryer) is a high - efficiency, continuous drying equipment specially designed for processing difficult - to - dry materials such as pasty, filter cake - like and high - viscosity liquids.
The flash dryer cleverly combines fluidized bed, pneumatic drying and crushing technologies. Its core working principle is as follows: The wet material is fed into the bottom of the drying chamber, where it meets the high - speed rotating crushing agitator at the bottom and is instantly dispersed and crushed. Meanwhile, the high - temperature hot air rising at high speed (usually 400 - 700°C) is fully mixed with these dispersed tiny wet material particles. The material is suspended, fluidized and completes the heat and mass transfer process in a very short time (usually from a few seconds to dozens of seconds), and the moisture is rapidly evaporated. The dried fine powder enters the cyclone separator and bag filter with the airflow for collection, and the tail gas is discharged.
This "bottom crushing + instantaneous convection of hot air" mode enables it to effectively solve the drying problems of high - moisture and high - viscosity materials.
Flow Chart of Rotary Flash Dryer System
Application of Flash Dryer in the Starch Industry:
The rotary flash dryer is a device that is increasingly widely used, has prominent advantages but requires fine control in the drying process of starch (especially modified starch and some high - value - added raw starches), especially when processing starch products with high - quality requirements.
After starch (such as corn starch, tapioca starch, potato starch and their derivatives) is modified by chemical, physical or enzymatic methods, the moisture content of the wet filter cake usually needs to be dried from 30% - 45% to 10% - 14% of the finished product moisture. The rotary flash dryer shows the following significant advantages in this field:
Efficiently process sticky and wet filter cakes: Directly process the pasty starch filter cakes discharged from the filter press or centrifuge without pre - drying or granulation. The process is simple and the degree of automation is high.
Instant drying with excellent quality: The contact time between hot air and materials is extremely short (a few seconds). Although the inlet air temperature is high, the actual temperature of the materials is low (usually not exceeding 60 - 70°C), which can minimize the gelatinization, thermal degradation, and denaturation of starch, effectively protecting the granular structure, whiteness, and functionality (such as viscosity and gelatinization characteristics) of starch.
Combining crushing and drying functions: The stirring teeth at the bottom can effectively break up filter cakes and prevent agglomeration. The dried starch consists of porous and loose particles with good fluidity and solubility.
Continuous and large-scale production: It is very suitable for large-scale continuous production lines and can be seamlessly connected with upstream modification, washing, and dehydration processes, resulting in high production efficiency.
Controllable product particle size: Through the top classifier, the fineness and uniformity of the product can be controlled, reducing the content of coarse particles and fine powder.
Main advantages and features of the flash dryer:
Unique advantages in processing materials
No need for pretreatment: It can directly process highly viscous and high-moisture materials such as pastes, filter cakes, and slurries, eliminating the cumbersome pre-treatment processes such as dilution and granulation.
“One-step” drying: It integrates drying, crushing, and screening. While drying, the materials are continuously crushed and classified by the crushing device at the bottom and high-speed airflow, ultimately obtaining a uniform fine-particle product.
High efficiency and energy saving
High drying intensity: Since the materials are highly dispersed and have a large contact area with high-temperature hot air, the heat and mass transfer rates are extremely fast, and the evaporation capacity per unit volume is large.
High thermal efficiency: The high-temperature gas is in co-current contact with the wet materials. The large temperature difference at the inlet results in relatively low power consumption and a relatively high comprehensive thermal efficiency.
Good product quality
Controllable temperature, suitable for heat-sensitive materials: Although the inlet air temperature is very high, due to the rapid evaporation of moisture in the material, which takes away a large amount of heat, and the residence time is extremely short, the actual temperature of the material is much lower than the outlet air temperature, which can effectively avoid overheating and denaturation of the material and maintain its activity.
Uniform product particle size and good fluidity: By adjusting the speed of the crusher and the air volume, the particle size and moisture of the final product can be controlled.
Convenient operation and control
Continuous automated production: It can realize continuous automated operation from feeding, drying to powder collection, which is suitable for large-scale industrial production.
Negative pressure operation of the system: The whole system operates under a slight negative pressure state, so the dust is not easy to escape, the working environment is clean, and the safety is high.
Compact structure and relatively convenient maintenance
The main body of the equipment is a vertical structure, which covers a small area.
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The main moving part is the crushing agitator at the bottom, with a relatively simple structure and concentrated maintenance points.
Typical application fields of flash dryer:
Inorganic chemical industry:Calcium carbonate, kaolin, silica, aluminum hydroxide, various metal hydroxides, pigments, catalysts, etc.
Organic chemical industry:Dyes, pigment intermediates, pesticides (such as glyphosate), flame retardants, resins, etc.
Minerals and Metallurgy: Ceramic raw materials, bentonite, various metal ore powders, sludge, etc.
Food and Feed:Starch, soy protein, corn syrup, yeast, distillers' grains, etc. (food-grade configuration and heat source are required).
Technical parameter table of flash dryer:
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