Exhaust gas absorption system

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Exhaust gas absorption system

在硫酸廠、冶煉廠、發(fā)電廠、化肥廠等行業(yè)里,生產(chǎn)尾氣中含有大量的有毒物質(zhì),需要經(jīng)過尾氣吸收處理禍?zhǔn)自倮没蛘吲欧?。目前常用的尾氣回收工藝主要有氨法和鈉法,其中氨法包括泡沫塔兩段氨法、管道式復(fù)噴復(fù)擋兩段氨法、管道式復(fù)噴復(fù)擋三段氨法、以碳銨為原料兩段氨法及三段氨法。二氧化硫尾氣經(jīng)過兩段氨法或者三段氨法后,放空廢氣二氧化硫的濃度可達(dá)到~200ppm。

In industries such as sulfuric acid plants, smelters, power plants, and fertilizer plants, the production tail gas contains a large amount of toxic substances, which need to be reused or discharged after the tail gas is absorbed and treated. At present, the commonly used tail gas recovery processes mainly include the ammonia method and the sodium method. The ammonia method includes the two-stage ammonia method in the foam tower, the pipeline-type multiple injection and multiple block two-stage ammonia method, the pipeline-type multiple injection and multiple block three-stage ammonia method, and the ammonium bicarbonate method. It is the raw material two-stage ammonia method and three-stage ammonia method. After the sulfur dioxide tail gas passes through the two-stage ammonia process or the three-stage ammonia process, the concentration of sulfur dioxide in the vented exhaust gas can reach ~200ppm.

The tail suction equipment mainly includes a packed absorption tower, a foam absorption tower, and a compound spray compound absorber. The technical parameters are as follows:

Serial numberProjectPacked absorption towerFoam absorption towerDouble injection double block absorption tower
1Empty tower operating speed0.4~2m/s1.5~2.5m/s12~14m/s
2Spray density3~10m3/(m2.h)12~18m3/(m2.h)——
3Absorption efficiency~90%~92%~90%
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