Large-scale continuous energy-saving fluidized bed spray granulation drying process

Abstract

The invention discloses a large-scale continuous energy-saving fluidized bed spray granulation drying process, which belongs to the granulation drying technology. The surface of the seed crystal particles in the granulation fluidized bed is dried under the combined heating of the hot air and the built-in heater. The discharged materials are first screened out of lumps and oversized particles, and then sent to the cooling fluidized bed After the discharged materials are screened, the materials larger than the qualified particle size are crushed by the crusher, and then returned to the granulation fluidized bed together with the material smaller than the qualified particle size as crystal seeds for re-granulation, and the qualified particle size is sent to the into the finished product silo. The invention has strong material adaptability, can obtain granular products with large specific gravity, high strength, good sphericity, uniform particle size, and is not easy to absorb moisture, and realizes continuous large-scale production. Pollution and other characteristics.

Description

technical field [0001] The invention relates to a granulation drying technology, in particular to a large continuous energy-saving fluidized bed spray granulation drying technology. Background technique [0002] In various fields such as chemical industry, food, pharmaceutical and environmental protection, a large amount of liquid materials need to be dried. The main drying methods of liquid materials are: spray drying, spray granulation drum drying, one-step granulation drying, drum drying, etc. Different drying methods have different drying characteristics and material application ranges. Among them, the spray dryer has strong material adaptability, wide production capacity range, and is the most widely used. Loose and fine powder products can be obtained through spray drying. The spray granulation rotary drum dryer has a large single-unit processing capacity, which is suitable for drying materials with strong moisture absorption and easy to stick to the wall, and can pro...

AI Technical Summary

Problems solved by technology

[0005] The technical task of the present invention is to provide a large-scale continuous energy-saving fluidized bed spray granulation drying process for the above-mentioned deficiencies in the prior art. The large-scale continuous energy-saving fluidized bed spray granulation drying process has strong material adaptability, especially It is suitable for liquid materials that cannot be produced by spray drying due to strong moisture absorption and easy wall adhesion; it can obtain granular products with large specific gravity, high strength, good sphericity, uniform particle size, and not easy to absorb moisture. It can be suitable for feed additives, fertilizers, etc. In order to meet the requirements of mixed application with other granular materials; realize large-scale continuous large-scale production; there is no problem of pyrolysis of materials, and the exhaust gas has little environmental pollution

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