Pulp making device for producing compound fertilizer by high tower pelletizing

Abstract

The pulping equipment for producing compound fertilizer through high tower pelletizing includes one melting pot with heater and stirrer, one first mixing pot with heater and stirrer, one second mixing pot with stirrer, one first overflow device to communicate the higher melting pot with the first mixing pot, and one second overflow device to communicate the higher first mixing pot with the second mixing pot. It may be used to realize serial low temperature pulping, and has low temperature operation, good pulp flowability, good operation environment, low nitrogen loss and other advantages.

Description

technical field [0001] The invention relates to a high-tower granulation pulping equipment for producing compound fertilizer. Background technique [0002] The key technology of compound fertilizer tower production is the pulping process. In the prior art, high-tower compound fertilizer pulping is to combine molten urine (or ammonium nitrate liquid) with solid powder preheated by solid heating equipment. Mix pulp. The urea (or ammonium nitrate) melting device is a double-rod stirring heater with a hollow double shaft and paddles inside and a jacket on the outside for heat preservation, and a coil and a distributor inside to keep solid urea only in contact with the heating device. A heated melter that touches but does not enter the molten pool. Since these two melters are solid urea in contact with the heater, the heat transfer and heat exchange effects are poor, and the local material temperature is high, so it is easy to produce biuret for urea. In addition, under the sa...

AI Technical Summary

Problems solved by technology

The heat transfer and heat exchange effect of the double-rod stirring heater is poor, and the powdery material is easy to agglomerate, so it is necessary to add a crushing device

The drum heating device uses the flue gas to directly heat the raw material. The raw material is easily polluted, and there is a lot of dust during heating, which makes it difficult to collect dust. The equipment occupies a large area and the investment cost is high.

[0004] Chinese patent application with application number 200510060037.4 discloses a heating mixer for producing granular compound fertilizers. Although the heating mixer removes the solid preheating device, all cold materials enter at the same time because only one-stage mixing heater is used. , the mixing is difficult to be uniform, the heating intensity must be high, and a larger heating mixer is required to make the material stay in the heater for a long time

For urea-based compound fertilizers, the polymerization reaction of ammonium phosphate will increase, the viscosity of the slurry will increase, and the nitrogen loss will increase.

For nitro compound fertilizers, the viscosity of the slurry increases due to the reaction between the potassium salt and the ammonium nitrate salt, which is not conducive to granulation.

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