In the waste gas treatment technology, solution adsorption of activated carbon is the most efficient treatment, especially in chemical, petrochemical, viscose fiber and cellophane industries, etc.
The waste gas treatment adopts alkali absorption method to remove H2S and the CS2 adsorbed by activated carbon. The features are its greater operation economy than the combustion method and can also be performed with low-concentration waste gas with high efficiency. The CS2 recycling rate can reach beyond 75%.
There are two parts of the treatment, high and low concentrations, in the waste gas. One is acid bath deaeration, the high-concentration H2S waste gas is exhausted from the acid bath storage and the spinning machine. The other part is from the second bath tank, drafting machine, cutter, liquid workshop and villus trough, which contain high CS2. The waste gas with high H2S needs to go through three alkali washes, and then enter the washing tower with CS2 highly-contained waste gas for rear treatment.
The Packages of Hydrogen Sulfide Removal
The H2S high-concentration waste gas need to go through three alkali washes, during the wet removal process.
1. Water wash: Mix the H2S highly-contained gas in the workshop and enter the acid bath removal trough for water wash, removing the Na2SO4, Na2CO3, H2SO4 and other foreign matters in the waste gas, thus to purify the air.
2. Alkali wash:
The pretreatment to H2S will be performed though 3 alkali tanks. The water-washed waste gas will be sent to the entrance above of the first alkali tank by fan, and the atomized lye from the upper sprinkler head then absorbs H2S, producing NaHS and Na2S. After the waste gas go es through the 2nd and 3rd alkali tanks, its concentration drops to about 150ppm, and is then sent to the washing tower to decrease the concentration of H2S. The 22% NaHS solution generated is delivered to the storage can and is drawn away regularly by chemical industry, to produce NaHS tablets.
