How is this sulfur recovery process designed?
Thread Content
There is exhaust gas from a steel plant, with SO2 accounting for 40% and the remainder being N2. If sulfur is to be produced, how should this process be designed? Everyone can use their imagination :)
Fantasies... still need to have a theoretical basis, right? I said, use a pot to cook it – will you do it? Back to the main topic, generally, the process for sulfur recovery units is determined based on the concentration of hydrogen sulfide in the exhaust gases. Based on what you said, the hydrogen sulfide content is 40%, with the remainder being nitrogen. Given that the probability of actual operating conditions being below 40% is considered, and assuming that all other components are nitrogen, it is recommended to use the split-flow method for handling such exhaust gases; for everything else, a conventional design will suffice Reference: \"Sulfur Recovery Technology and Engineering\", page 24
Such a high level of sulfur dioxide as you mentioned certainly cannot result from operations in a steel plant; if hydrogen sulfide reaches 40%, then that’s another matter. See how large the capacity is. It can be sent in detail for discussion
This post was last edited by “I’m so stupid, wuwu” on 2020-3-12 at 08:17. Please note that it’s SO2, not hydrogen sulfide. :lol
The key to this issue has nothing to do with the steel mill: lol Can this operating condition be used for sulfur recovery?
I have an immature idea: firstly, the SO2 content is too high, and the hydrogenation reaction releases a large amount of heat, which is difficult for the reactor to handle. There are two measures that can be taken: 1) Dilute the SO2 content, then carry out partial hydrogenation, adjust the H2S/SO2 ratio, and subsequently use the Claus process to produce sulfur. 2. Alternatively, the hydrogenation reactor can use an isothermal reactor for heat removal to carry out partial hydrogenation, adjust the H2S/SO2 ratio, and then proceed with sulfur production via the Claus process. I wonder if it’s feasible?
I'm sorry. I did make a subjective assumption....
Haha, welcome to continue the discussion. :)
A hydrogenation catalyst can be used; under the action of this catalyst, some of the sulfur dioxide is hydrogenated to produce elemental sulfur directly, while another portion of the sulfur dioxide is hydrogenated to form hydrogen sulfide, which then continues to undergo the Claus reaction with the remaining sulfur dioxide. I think this approach is feasible:.
I agree with you; at least in theory, it makes sense.
It can be said that it doesn’t work in theory either. Reducing sulfur dioxide to hydrogen sulfide is too difficult; chemical thermodynamics may make it feasible, but this does not mean it is feasible from a chemical kinetics perspective. If the amount of sulfur dioxide you have is high, it would be better to design a sulfuric acid production facility that converts sulfur dioxide into sulfur trioxide to produce sulfuric acid; this process is simple, and it is reliable from both chemical thermodynamics and chemical kinetics perspectives.