Ammonium phosphate ammonia washing tail gas treatment process and ammonium phosphate ammonia washing system

Abstract

The invention discloses an ammonium phosphate ammonia-washing tail gas treatment technology and an ammonium phosphate ammonia-washing system capable of conducting a harmless treatment and recycle of the tail gas generated from the ammonium phosphate ammonia-washing technology. The ammonium phosphate ammonia-washing tail gas treatment technology comprises a first step of washing tail gas generated from a concentrated ammonia liquor intermediate tank, a concentrated ammonia liquor product tank and a concentrated ammonia liquor loading platform in the ammonium phosphate ammonia-washing technology through ammonium phosphate ammonia-washing enriched liquid; a second step of conveying the ammonium phosphate ammonia-washing enriched liquid after washing the tail gas to an oil removal machine in the ammonium phosphate ammonia-washing technology; a final step of conveying the ammonium phosphate ammonia-washing enriched liquid to a desorption system to generate concentrated ammonia liquor and conveying the concentrated ammonia liquor to the concentrated ammonia liquor intermediate tank. The ammonium phosphate ammonia-washing system comprises an absorption system, the desorption system and a tail gas treatment system, and the tail gas treatment system comprises the concentrated ammonia liquor intermediate tank, the concentrated ammonia liquor product tank, a concentrated ammonia liquor jacking tube, an ammonia collecting cover and a Venturi tube. By the adoption of the ammonium phosphate ammonia-washing tail gas treatment technology and the ammonium phosphate ammonia-washing system, the tail gas treatment can be performed, the environmental pollution can be avoided, the ammonia liquor output is improved, and the ammonia liquor product quality stability is increased.

Description

technical field [0001] The invention relates to an ammonium phosphate ammonia washing process, in particular to an ammonium phosphate ammonia washing tail gas treatment process and an ammonium phosphate ammonia washing system capable of realizing the ammonium phosphate ammonia washing tail gas treatment process. Background technique [0002] Known: ammonium phosphate ammonium washing process is to wash the ammonia in the coke oven gas to produce 15-20%wt concentrated ammonia water product, the process is provided with a concentrated ammonia water intermediate tank 102, a concentrated ammonia water product tank 107 and a concentrated ammonia water Loading platform. In order to ensure the safe storage and transportation of concentrated ammonia water, the upper part of the concentrated ammonia water storage tank is equipped with a release pipe connected to the atmosphere. In order to sell the concentrated ammonia water to the outside world, the ammonium phosphate ammonia washin...

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Problems solved by technology

Because concentrated ammonia water is very volatile, its volatility increases with the increase of concentration. At the same time, the solubility of ammonia decreases with the increase of temperature, and the volatility of concentrated ammonia water increases with the increase of temperature. When phosphorus When the ammonium washing ammonia process produces concentrated ammonia water with a concentration greater than 18%wt, the volatilization of the concentrated ammonia water in the concentrated ammonia water storage tank increases sharply, and a large amount of ammonia-containing tail gas escapes to In the atmosphere; not only that, during the loading process of the concentrated ammonia water, the ammonia volatilized from the concentrated ammonia water also directly enters the atmosphere, and the disorderly discharge of ammonia-containing tail gas causes the ammonia content in the air in the ammonium phosphate ammonia washing process area to reach as high as 80mg / m 3 , seriously exceeding the 4mg / m specified in the "Odor Pollutant Emission Standard" (GB14554-93) 3 The ammonia smell spreads, and the on-site operating environment is very bad, which directly threatens the physical and mental health of employees and safe production. At the same time, it also causes low ammonia water product output and large fluctuations in the quality of ammonia water products. In order to meet environmental protection requirements, the ammonia washing process with ammonium phosphate is replaced Forced to produce only low-concentration ammonia water with a concentration below 18%wt, because the demand for low-concentration ammonia water below 18%wt in the concentrated ammonia water market is extremely low, it is very difficult to sell and harmlessly dispose of low-concentration concentrated ammonia water

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