Ammonia-containing waste gas absorption system

Abstract

The invention discloses an ammonia-containing waste gas absorption system which consists of a first absorption tower, a heat exchanger, a first centrifugal pump, a second centrifugal pump, a Venturi mixer, a second absorption tower and a third absorption tower. The first absorption tower, the heat exchanger and the first centrifugal pump form a circulation and cooling system which is capable of greatly increasing the concentration of absorbed ammonia water; water and gas inlets are formed in multiple side lines of the second absorption tower, so that the absorption efficiency and the operationelasticity are improved; particularly due to arrangement of a floating valve tower plate of the second absorption tower, direct contact of a tail gas discharged from the second absorption tower and soft water is ensured, and the fact that the content of ammonia in the tail gas discharged from the tower can be reduced and stabilized can be controlled; a cation exchange resin is adopted as packingof the third absorption tower, a buffer capability is provided for ammonia absorption, and the operation elasticity of the device is improved.

Description

technical field [0001] The invention belongs to waste gas treatment technology, in particular to an ammonia-containing waste gas absorption system. Background technique [0002] Ammonia is one of the typical toxic and harmful industrial gaseous pollutants. A large amount of ammonia-containing waste gas is directly discharged into the atmosphere, which not only causes the loss of synthetic ammonia products, but also deteriorates people's living environment. Sources of ammonia-containing waste gas include bleed gas from synthetic ammonia production, high-altitude exhaust tail gas from urea prilling towers, coke oven gas, ammonia refrigeration tank exhaust, nitric acid plant tail gas, and the production process of using ammonia to synthesize organic amines. Therefore, the purification, treatment and recovery of ammonia-containing waste gas has important environmental protection and economic value. At present, there are mainly two kinds of ammonia-containing waste gas treatment...

AI Technical Summary

Problems solved by technology

[0003] The main problem in the absorption and recovery system of ammonia-containing waste gas is that the concentration of ammonia in the tail gas after water absorption is usually greater than 15 ppm, and it needs to be absorbed by an acid solution before being discharged, and the concentration of ammonia in the tail gas increases with the amount of waste gas and the concentration of ammonia. The size increases rapidly, and the consumption of acid solution also increases rapidly

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