Ammonia-containing air purification method

Abstract

The invention relates to an ammonia-containing air purification method, which comprises the following steps that (1) the flow of ammonia-containing air is guided to a tower bottom inlet of a sprayingabsorption tower through a draft fan; (2) the ammonia-containing air rises through the tower bottom inlet; at the moment, the tower top sprays soft water, so that the ammonia-containing air and soft water generate reverse flow contact; (3) in the reverse flow contact process, ammonia gas in the ammonia-containing air is completely dissolved into water and descends to the tower bottom along with the liquid; obtained purified air continuously rises to the tower top to be emitted into the air; (4) soft water after the ammonia gas absorption at the tower bottom is conveyed to the tower top again through a circulation pump; (5) the ammonia-containing air to be purified is supplemented again for contact absorption; the absorption process is repeated. Inorganized ammonia gas in the ammonia-containing air is collected to form dilute ammonia water waste liquid; the ammonia-containing air is purified; in addition, the dilute ammonia water waste liquid is used as supplementing water of a carbonization system; the resources are reasonably utilized.

Description

technical field [0001] The invention relates to a method for purifying ammonia-containing air, which belongs to the technical field of waste gas treatment. Background technique [0002] In ammonium bicarbonate and other chemical fertilizer production enterprises, in the air at the outlets of finished fertilizer products, packaging areas, stacking warehouses, etc., a large amount of unorganized low-concentration ammonia-containing air is easy to accumulate. This part of the ammonia-containing air diffuses in the site, which not only produces a pungent smell that makes employees uncomfortable, but more importantly, wastes a lot of ammonia resources. [0003] In the patent CN 206793387, an ammonia tail gas recovery and treatment device uses dilute acid to neutralize the ammonia tail gas. Although this method can finally meet the discharge standard, it will consume dilute acid resources and produce acid-containing wastewater that cannot be reused. Contents of the invention ...

AI Technical Summary

Problems solved by technology

This part of ammonia-containing air diffuses in the site, which not only produces a pungent smell that makes employees uncomfortable, but more importantly, wastes a lot of ammonia resources

[0003] Patent CN 206793387 In an ammonia tail gas recovery and treatment device, dilute acid is used to neutralize ammonia tail gas. Although this method can finally meet the discharge standard, it will consume dilute acid resources and produce acid-containing wastewater that cannot be reused

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