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Help CenterStarch Rotary Flash Dryer, Special Flash Drying Equipment for Starch
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Overview of Rotary Flash Dryer Equipment:
Flash dryer (also known as rotary flash dryer or instant dryer) is a high - efficiency, continuous drying equipment, specifically designed for processing difficult - to - dry materials such as pastes, filter cakes and high - viscosity liquids.
The flash dryer ingeniously 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 suspends, fluidizes and completes the heat and mass transfer process in a very short time (usually 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 mode of "bottom crushing + instantaneous convection of hot air" 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 an increasingly widely used, outstanding - advantage but finely - controlled equipment in the drying process of starch (especially modified starch and some high - value - added raw starches), especially when dealing with starch products with high - quality requirements.
After chemical, physical or enzymatic modification, starches (such as corn starch, tapioca starch, potato starch and their derivatives) usually need to be dried from wet filter cakes with a moisture content of 30% - 45% to finished products with a moisture content of 10% - 14%. The rotary flash dryer shows the following significant advantages in this field:
Efficiently process sticky and wet filter cakes: It can directly process the paste - like starch filter cakes discharged from the filter press or centrifuge without pre - drying or granulation, featuring a simple process and high automation.
Instant drying and 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℃), which can minimize the gelatinization, thermal degradation and denaturation of starch, and effectively protect the granular structure, whiteness and functionality (such as viscosity and gelatinization characteristics) of starch.
Combined crushing and drying functions: The stirring teeth at the bottom can effectively break up the filter cake and prevent caking. The dried starch is in the form 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 the upstream modification, washing and dehydration processes, with high production efficiency.
Controllable product particle size: Through the top classifier, the fineness and uniformity of the product can be controlled, and the content of coarse particles and fine powder can be reduced.
Main advantages and features of the flash dryer:
Unique advantages in processing materials
No pre-treatment required: It can directly process high-viscosity 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 the high-speed airflow, and finally a uniform fine particle product is obtained.
High efficiency and energy saving
High drying intensity: Since the materials are highly dispersed and have a huge contact area with the 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, with a large temperature difference at the inlet, relatively low power consumption and 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: The whole process from feeding, drying to powder collection can be continuously and automatically operated, which is suitable for large-scale industrial production.
Negative pressure operation of the system: The whole system operates under a slight negative pressure, so the dust is not easy to escape, the working environment is clean, and the safety is high.
Compact structure and relatively easy maintenance
The main body of the equipment is of vertical structure, covering 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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