Online cleaning method of tubular reactor fouling in ammonium phosphate production

Abstract

The invention discloses an online cleaning method of tubular reactor fouling in ammonium phosphate production. The method comprises the steps that firstly, cleaning liquid is prepared, the cleaning liquid is formed by mixing sulfuric acid with the mass fraction being 60 to 98% and water, and the mass ratio of the sulfuric acid to the water is 1:25-30; secondly, an outlet pipe of a cleaning liquidstorage groove is connected with an inlet of a tubular reactor conveying pump; thirdly, when fouling appears in a tubular reactor, a tubular reactor acid blending groove bottom valve is closed, a cleaning liquid storage groove control valve is opened, the cleaning liquid is fed into the tubular reactor through the tubular reactor conveying pump, through an ammonia blowing pie of the tubular reactor, the steam is heated, and fouling cleaning of the tubular reactor and related pipelines can be accelerated. The method has the beneficial effects that the tubular reactor does not need to be detached, online running for fouling cleaning is achieved, investment is small, equipment configuration is simple, fouling is quite obvious, device running efficiency is improved, and enterprise benefits areimproved.

Description

technical field [0001] The invention relates to a phosphate fertilizer production device, in particular to the production of ammonium phosphate, and in particular to a method for removing fouling of a tubular reactor and related pipelines in the production of ammonium phosphate. Background technique [0002] At present, most of the granulation production of diammonium phosphate adopts a single-tube or double-tube reaction granulation process, which is widely used in the production of ammonium phosphate due to its simple structure, rapid reaction, high heat utilization rate and many other advantages. In the production of diammonium phosphate fertilizer, the "traditional method" or "neutralization slurry concentration" method is usually used. Since phosphate rock contains a large amount of Ca, Mg, Al, SiO 2 A large number of impurities, such as ammonium phosphate slurry in the process of neutralization in the tubular reactor, there will be a layer of relatively hard scaling o...

AI Technical Summary

Problems solved by technology

Since phosphate rock contains a large amount of Ca, Mg, Al, SiO 2 A large number of impurities, such as ammonium phosphate slurry in the process of neutralization of the tubular reactor, there will be a layer of relatively hard scaling on the inner wall of the tubular reactor, which will affect the normal operation of the tubular reactor and even cause damage to the product quality. influences

In order to remove fouling, the traditional method is to shut down the whole system and dismantle the tubular reactor off-line, then disassemble it section by section, and manually knock it out. Obviously, this method is time-consuming and laborious and will cause damage or even destruction to the tubular reactor.

For a long time, the cleaning of the tubular reactor in the production of diammonium phosphate in the tubular reactor has always restricted the stable operation of the production, and there is no good solution to this problem.

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