Reasons for the high hydrogen sulfide content in gas
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In our factory, the hydrogen sulfide level after gas desulfurization is only 20–30 milligrams per cubic meter. However, after going through the sulfuric acid AN and benzene washing processes, the hydrogen sulfide level increases significantly. What are the reasons for this? Thank you all for your guidance! :L
Where are the sampling points for your various work sections? Are there any leaks in the bypass valves that lead to or from the process section? Sampling is taken before the sampling point in the desulfurization section; when there is a leak, the H2S level increases, but this is reflected as an increase in the levels in the ammonium sulfate and crude benzene sections.
There is air leakage from the bypass valves used to enter and exit the work section
Which factory do you work at? What desulfurization process should be used? Our factory uses the HPF process, but the desulfurization results never meet the standards! I would appreciate some advice!
Given this situation, it can be concluded that there is a leak in the gas traffic valve in the desulfurization section
This phenomenon is completely normal; it’s not a problem related to analysis, nor is it an issue of air leakage.
We’re facing similar problems here; it’s not a testing issue. On the one hand, it is related to temperature, the dissociation of thiocyanide ； On the other hand, hydrogen sulfide is generated through a reaction with sulfuric acid in the ammonium sulfate section.
If the premises hold true: the testing method is the same, and testing is carried out regularly rather than only at certain stages, then there are two possibilities. First, the ammonium sulfide unit or the crude benzene unit may be introducing sulfur-containing materials into the gas, and second, the testing method has defects and is unable to distinguish between hydrogen sulfide and total sulfur. Second, ammonium sulfide or crude benzene introduces sulfur-free chemicals into the gas, interfering with testing.