Method for exhaust gas purification

Abstract

The invention discloses a novel method for exhaust gas purification. The method comprises the following steps that 1) exhaust gas is fed into a microporous aerator 3 arranged at the bottom of an absorption cell 4 by a fan 1, is adequately diffused and then is fed to the absorption cell 4; 2) an absorption solution 6 matched with the exhaust gas is filled into the absorption cell 4; the exhaust gas passes through the microporous aerator 3, then forms tiny bubbles and enters the absorption solution 6; and the exhaust gas is diffused gradually in the absorption solution 6 from bottom to top to be absorbed fully in the absorption liquid 6 which is static relatively. The novel method for exhaust gas purification can absorb and treat exhaust gas efficiently and thoroughly, has high saturated concentration of an absorption solution and high recycle values, and overcomes the defects of high structure adopted by the existing spray absorption method, high energy consumption, low efficiency and incomplete absorption.

Description

Technical field [0001] The invention relates to an exhaust gas purification treatment method, in particular to an exhaust gas absorption treatment method. Background technique [0002] The existing absorption tower spray absorption method, such as figure 2 As shown, the absorption liquid is sprayed from the upper absorption liquid inlet 1 of the absorption tower 7 through the nozzle 2 into the absorption tower 7 and the absorption liquid flows through the packing 3 from top to bottom. The exhaust gas enters the absorption tower 7 from the exhaust gas inlet 4 at the lower part of the absorption tower 7, flows through the packing 3 from bottom to top, and contacts with the spray absorption liquid dripping from the top to the packing 3 in the reverse flow phase and is absorbed. The absorbed gas escapes from the tail gas outlet 6 at the top of the absorption tower 7. The waste liquid 8 after absorbing the exhaust gas is discharged from the absorption liquid waste liquid outlet 5 at ...

AI Technical Summary

Problems solved by technology

[0003] 1) In the spray absorption tower, the flow from bottom to top is the mixed gas of exhaust gas and air, which reduces the effective contact time between exhaust gas and the absorption liquid sprayed down, and the bubbles are large and the transfer speed is slow, so that the exhaust gas cannot get Fully absorbed, difficult to meet emission standards

[0004] 2) The absorption liquid is sprayed down along the filler, and the liquid droplets are often large due to easy clogging, and the distribution of liquid is not uniform, which may easily cause short flow of exhaust gas and poor absorption effect

[0005] 3) The exhaust gas and liquid mist on the top of the spray absorption structure are large, the visual effect is poor, and it will also cause secondary pollution

[0006] 4) The amount of absorption liquid used in the spray absorption method is large, the absorption tower is high, the energy consumption of the circulating pump is high, the saturation concentration of the absorption liquid is low, and the operating cost is high

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