Calcium Phosphate Rotary Flash Dryer, High-efficiency Drying Equipment for Chemical Products
Overview of the Rotary Flash Dryer Equipment:
The flash dryer (also known as the rotary flash dryer or instant dryer) is a high - efficiency, continuous drying equipment specifically designed to handle difficult - to - dry materials such as paste, filter cake, 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 within 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 convective hot air” enables it to effectively solve the drying problems of high - humidity and high - viscosity materials.
Flow Chart of the Rotary Flash Dryer System
Main Advantages and Features of the Flash Dryer:
Unique Advantages in Handling Materials
No pre - treatment required: It can directly handle high - viscosity and high - moisture materials such as paste, filter cake, and slurry, eliminating the cumbersome pre - treatment processes such as dilution and granulation.
“One - step” drying: It integrates drying, crushing, and screening. While drying, the material is continuously crushed and classified by the bottom crushing device and high - speed airflow, and finally a uniform fine - particle product is obtained.
High Efficiency and Energy Saving
High drying intensity: Since the material is highly dispersed and has a huge contact area with the high - temperature hot air, the heat and mass transfer rate is 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 material. The temperature difference at the inlet is large, the power consumption is relatively low, and the comprehensive thermal efficiency is relatively high.
Good product quality
Controllable temperature, suitable for heat-sensitive materials: Although the inlet air temperature is very high, due to the rapid evaporation of the moisture in the material, a large amount of heat is taken away, 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 the 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 the whole-process 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. 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.
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 dryers:
Inorganic chemicals:Calcium carbonate, kaolin, silicon dioxide, 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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