Treatment method and treatment system for ammoniated pelleting compound fertilizer tail gas

Abstract

The invention discloses a treatment method and a treatment system for ammoniated pelleting compound fertilizer tail gas. The tail gas treatment method provided by the invention comprises the following steps of: simultaneously adding phosphoric acid and tail gas in a drying working section to a venturi tube; using phosphoric acid to wash ammonia in the tail gas; emptying the tail gas, and punching washing liquid into a pelleting working section, so as to react with pelleting tail gas in a pelleting working section venturi tube; performing secondary water washing due to high ammonia content in the pelleting tail gas; emptying the tail gas after ammonia content of the tail gas is qualified; and punching the washing liquid into a potassium hydride process to reuse. The tail gas treatment system provided by the invention comprises a drying tail gas working section and a pelleting tail gas working section. Ammonia discharge amount of the tail gas is reduced to be 20 kg per hour from 50-60 kg per hour, thereby being greatly lower than a national emission standard; the ammoniated pelleting compound fertilizer tail gas is discharged after reaching the standard, thereby reducing complaints from surrounding residents and creating a good social benefit; absorbed ammonia can be recycled, so that ammonia consumption is reduced, and production is more stable; the washing liquid is recycled without waste liquid, and is economical and practicable.

Description

technical field [0001] The invention relates to a method for comprehensively utilizing compound fertilizer tail gas and a treatment system thereof, in particular to a method for treating tail gas generated in the production process of ammoniated granulation to produce sulfur-based compound fertilizers and a treatment system thereof. Background technique [0002] In 2010, Shandong Liaocheng Luxi Chemical Fifth Fertilizer Co., Ltd. completed a set of ammonification granulation production equipment for sulfur-based compound fertilizers after transformation and construction, and carried out trial production. The tail gas of ammoniated granulation compound fertilizer is divided into two parts, one part is drying tail gas with a small amount of ammonia, and the other part is granulation tail gas with higher ammonia content. In the production process, in order to produce high-nitrogen compound fertilizers, secondary neutralization is required at the granulation station to increase ...

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Problems solved by technology

[0004] The method of treating tail gas by using water washing method disclosed in the above-mentioned patent is suitable for the treatment of tail gas of spray granulation compound fertilizer. Low, the method of washing with water is not applicable

[0005] In addition, as the environmental protection situation becomes more severe, the environmental protection emission indicators have also been greatly reduced, especially the ammonia emission standard has been reduced from the original 75 kg / h to the current 39 kg / h, and the production task cannot be met without adopting new washing methods. The further improvement and the realization of environmental protection goals

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