Air cooling device and novel process for cooling high tower granulation fertilizer

Abstract

The invention relates to a new high tower fertilizer cooling technology of an air cooling device. The air cooling device comprises an air filter, a heat exchanger, an air dehumidifier, an air preheater and a draught fan, which are communicated sequentially, and a cooling pipe network is arranged in the heat exchanger. The technology comprises: (1) materials output from the tower, after a screen separation, are input into a vibrating fluidized bed for heat exchange with cold wind; (2) the cold air produced by the air cooling device is input into a vibrating cooling tower and then introduced into the vibrating fluidized bed, and exhaust gas discharged from the fluidized bed is collected and disposed; (3) materials output from the fluidized bed are input into the vibrating cooling tower for heat exchange with input cold wind and cooled materials are proceeded into a next working procedure. The technology of the invention has positive and beneficial effect that: while materials are cooled completely, the damage to material grains is reduced and the smoothness of the grains is improved; the water content of the cooled materials is reduced; energy is saved and consumption is reduced effectively, and production cost is reduced as well.

Description

technical field [0001] The invention relates to a cooling device and a cooling process, in particular to a new cooling process for high-tower granulated fertilizer semi-finished products and an air cooling device used therein. Background technique [0002] In the 1990s, my country built and put into operation the first set of melt-type high-tower granulation equipment. In recent years, with the gradual expansion of high-tower fertilizer market requirements, dozens of high-tower granulation equipment have been built in succession across the country. [0003] The production process of compound fertilizer by melt-type high-tower granulation is simple. With the continuous progress of production technology and equipment research, from the production raw material processing, pulping, mixing to spray granulation process, the process flow and equipment structure have been compared. It is perfect, but in the cooling process of semi-finished products, the natural air cooling technolog...

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Problems solved by technology

[0004] ①When the material particles from the tower pass through the hoist, cooling cylinder, vibrating screen and other devices, under the force of mechanical collision extrusion and natural fall, the particles are broken and a large amount of powder is produced, which greatly destroys the roundness of the finished product particles. Spend;

[0005] ②After mechanical collision and friction, the surface of the particles will be rough and the surface finish of the finished particles will be destroyed;

[0006] ③The temperature of the material coming out of the tower is generally about 80°C, and it will be higher in summer. It is cooled by natural wind. Even after cooling by the secondary cooling cylinder, the temperature of the finished product packaging will still be above 50°C. The high temperature intensifies the degree of agglomeration of the finished product;

[0007] ④ It takes about 40 minutes for the materials coming out of the tower to be packaged for finished products. Due to the short time, the time for particle crystal transformation is not enough, resulting in poor particle strength;

[0008] ⑤The air humidity of the natural wind is high (the air humidity in summer is even higher), and using it as a refrigerant will increase the moisture content of the product, further aggravating the agglomeration rate of the finished product; ⑥The equipment used has high energy consumption and a large electrical load

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