Control of hydrogen sulfide content in coke oven flue gas
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Due to leakage issues, the flue gas from coke oven chimneys contains a certain amount of hydrogen sulfide. Currently, the sodium alkali method is used for desulfurization. I would like to know what the efficiency of removing H2S is while simultaneously removing SO2 I just saw a comment saying that SO2 + H2S == S + H2O. Does this reaction occur in the flue gases from coke ovens? If so, wouldn’t that mean hydrogen sulfide gets converted?
The reaction you mentioned, SO2+2H2S==3S+2H2O, definitely exists. Because this is a very simple redox reaction, H2S is the reducing agent, and SO2 is the oxidizing agent. However, what you said about all of the H2S being reacted is incorrect. First, you need to know the composition of coke oven flue gas; the approximate components are: O2 7.6%, N2 64.5%, H2O 16.2%, CO2 1.9%, CO 1.8%, H2S 4.2%, CH4 0.8%, SO2 0.05%, NOX 0.02%, gaseous organic compounds 0.05%, and others 2.88%. Based on this composition, it can be seen that the sulfides in coke oven flue gas are primarily H2S; the concentration of H2S is 84 times that of SO2. In other words, even despite the reaction between H2S and SO2 mentioned above, H2S is still present in large excess. Therefore, desulfurization of coke oven flue gas essentially involves removing H2S rather than SO2.
Simply install a set of laser-based hydrogen sulfide online analyzers directly on the gas pipeline; the analysis data is transmitted in real time, allowing for monitoring of hydrogen sulfide levels. This enables feedback control over the amount of desulfurizing agent used, ensuring effective desulfurization while saving on this chemical. Contact me at 15536568301
Isn’t flue gas desulfurization meant to remove SO2? Doesn’t hydrogen sulfide turn into SO2 after burning? Our company has implemented flue gas desulfurization using the ammonia method; the resulting ammonium sulfate solution is sent to the ammonium sulfate production unit to be converted into ammonium sulfate product.