Purifying device and purifying method for ammonia-containing mixed gas

Abstract

The invention discloses a purifying device and purifying method for ammonia-containing mixed gas. The purifying deice comprises an absorption liquid tank, a PP pump, multiple stages of membrane assemblies and a draught fan; a solution in the absorption liquid tank enters the inner sides of membrane wires of the first-stage membrane assembly through the PP pump, flows out from the inner sides of membrane wires of the last-stage membrane assembly and then returns back to the absorption liquid tank again; the ammonia-containing mixed gas enters the outer sides of the membrane wires of the last-stage membrane assembly through the action of the draught fan and diffuses to enter the inner sides of the membrane wires to react with absorption liquid on the inner sides of the membrane wires, and therefore the ammonia-containing mixed gas is eliminated. According to the purifying device, due to the fact that multiple stages of the membrane assemblies are arranged, it is guaranteed that ammonia is completely absorbed by the absorption liquid, and the content of ammonia in the mixed gas exhausted by a purified gas outlet is lower than 5 ppm; the structure is simple, and the adopted PTFE membrane wires have the high hydrophobicity, and therefore it can be guaranteed that the absorption liquid stays on the inner sides of the membrane wires; in addition, circular flowing is achieved through the PP pump, and then ammonia is continuously removed.

Description

technical field [0001] The invention relates to a waste gas treatment device and a treatment method, in particular to a purification device and a purification method for ammonia-containing mixed gas. Background technique [0002] With the rapid development of industry, the problem of air pollution is becoming more and more serious. A large amount of ammonia-containing mixed gas is produced in the pharmaceutical industry and chemical industry, and most of these waste gases are not treated and are directly discharged into the atmosphere. It not only seriously pollutes our living environment but also causes a lot of waste. In order to solve such problems, people usually use water washing method, but this method has problems such as too large equipment volume and large investment. [0003] At present, most researchers at home and abroad are focusing on the treatment of ammonia-containing wastewater, and there are not many studies on ammonia-containing waste gas. Patent CN20282...

AI Technical Summary

Problems solved by technology

Patent CN202823116U discloses "a recovery device for ammonia in exhaust gas". Although this device can absorb ammonia in exhaust gas, the device is very complicated, including membrane modules, liquid pumps, liquid storage tanks, liquid distribution tanks, dilute acid high-level Devices such as tanks, crystallizers and centrifuges

The cost of required equipment is relatively high, and the efficiency is not high

Patent CN103818930A discloses "a device and its operation method for separating and recovering waste ammonia gas from LED production by using a membrane group". This method absorbs ammonia gas through water, which reduces the efficiency of absorbing ammonia gas, and the device is very complicated

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