Tail gas recycling method for compound fertilizer production

Abstract

The invention discloses a tail gas recycling method for compound fertilizer production. The tail gas recycling method comprises the following steps: introducing tail gas into gravel dust removal equipment for dust removal, wherein the tail gas passes through a waterfall formed by flowing gravels, and the gravels remove compound fertilizer dust in the tail gas; introducing the tail gas into a venturi scrubber from the medium gravel dust removal equipment, and circularly washing the tail gas with water; then, introducing the tail gas into a washing liquid circulating tank from the venturi scrubber for circular washing again; after being defoamed by a rotational-flow plate tower, feeding the tail gas into a tail gas washing tower by a tail gas fan to be washed again by phosphoric acid, and feeding the tail gas into an exhaust funnel for discharging; and returning washed phosphoric acid into a potassium hydrogen phosphate removal tank for acid mixing, sending wastewater discharged by the tail gas washing tower to a sewage treatment station to be treated and returning the treated wastewater to a neutralization procedure. According to the method, the ammonia absorption efficiency of the tail absorption tower can be greatly improved, so ammonia emission is effectively reduced, ammonia in the tail gas is further recycled, and good economic benefits and environmental benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of tail gas recovery, in particular to a method for recycling tail gas used in the production of compound fertilizers. Background technique [0002] Compound fertilizer refers to chemical fertilizers containing two or more nutrients. Compound fertilizer has the advantages of high nutrient content, less auxiliary components and good physical properties. It plays a very important role in balancing fertilization, improving fertilizer utilization rate, and promoting high and stable yield of crops. At present, chemical plants usually use low-temperature conversion of potassium chloride and spray granulation drying technology to produce sulfur-based nitrogen, phosphorus and potassium compound fertilizers. The main component of the granulation tail gas discharged after spray granulation and drying in production is NH 3、 SO 2 and dust, after preliminary treatment in the factory, it can effectively reduce SO 2 and...

AI Technical Summary

Problems solved by technology

At present, chemical plants usually use low-temperature conversion of potassium chloride and spray granulation drying technology to produce sulfur-based nitrogen, phosphorus and potassium compound fertilizers. The main component of the granulation tail gas discharged after spray granulation and drying in production is NH 3、 SO 2 and dust, after preliminary treatment in the factory, it can effectively reduce SO 2 and dust emissions, but ammonia emissions are still relatively large

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