For acidic gases, should activated carbon be used after spraying with alkali followed by water, or after spraying with water first and then alkali? Why?
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For acidic gases, should activated carbon be used after spraying with alkali followed by water, or after spraying with water first and then alkali? Why?
Personally, I think it’s better to use alkali first and then water. In both cases of alkali spraying or water spraying, heat is generated. By using alkali first, more heat can be retained in the alkali tower, while only a small amount of heat (generated by reactions in the alkali tower) is absorbed by the water tower, thereby reducing the moisture content of the gas that enters the activated carbon
Alkali washing is used to remove acidic gases, while water washing is employed to reduce the amount of alkali carried in the gases; performing water washing first is pointless. What is the last activated carbon used for?
If the acidic gases dissolve in water and the resulting wastewater is easy to treat, then treat it with water first and then with alkali. If not, use alkali first and then water.
Of course, water is used first followed by alkali. At the beginning, the concentration of acidic gases is high; washing with water reduces this concentration, after which alkali washing is carried out. If alkali is used first and then water washing, the water washing step will be ineffective, as most of the absorption occurs during the alkali washing stage