Method for improving washing effect of ammonium phosphate granulation tail gas

Abstract

The invention discloses a method for improving the washing effect of ammonium phosphate granulation tail gas. The method comprises the following steps: the granulation tail gas sequentially flows through a Venturi pre-stage washer, a Venturi washer and a horizontal washer and is washed by a washing liquid from the front chamber of a cycle tank in a cycle manner, the washed tail gas flows through a condenser to remove water, the water removed tail gas flows through a demister and undergoes solid-liquid separation, and the obtained tail gas is discharged to the atmosphere through a chimney; most of the washing liquid in the front chamber of the cycle tank enters the rear chamber of the cycle tank, and is mixed with the washing liquid overflowing from the front chamber of the cycle tank, and the obtained washing liquid mixture is sent to an ammonia tube reactor to participate in a reaction; concentrated phosphoric acid is added to the Venturi washer; and diluted phosphoric acid is introduced into the front chamber of the cycle tank. The method can solve the problems of low ammonia absorption and poor washing effect of present methods.

Description

technical field [0001] The invention relates to the technical field of fertilizer processing, in particular to a process method for improving the washing effect of ammonium phosphate granulation tail gas. Background technique [0002] In the production process of ammonium phosphate, the tail gas produced by the granulation and drying process contains ammonia and particle dust, which need to be recovered before being discharged. The tail gas washing equipment of the ammonium phosphate plant uses phosphoric acid liquid to cycle wash the granulation and drying tail gas, and recover ammonia and dust in the tail gas. In the single-tube reaction process, the entire washing system is designed to use low neutralization (N / P is 0.5) washing. The washing process is as follows: the granulation tail gas flows through the Venturi scrubber and the horizontal scrubber in turn, after being washed by the washing liquid from the front chamber of the circulation tank, then flows through the c...

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a process for improving the washing effect of ammonium phosphate granulation tail gas, so as to solve the problems of low ammonia absorption rate and poor washing effect in the existing process

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