DDS desulfurization ---- MDEA decarburization: Can the order of these steps be reversed?
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Gas production ----- Tannin desulfurization ---- 1.6MPa medium-low-low shift ---- DDS desulfurization ---- MDEA decarburization ---- Advanced desulfurization Thank you!
It cannot be reversed; DDS desulfurization refers to the desulfurization of transformed gas, while MDEA is used for decarburization. The hydrogen sulfide level after decarburization is already very low; generally, advanced desulfurization (dry method) is used. I’ve never heard of wet desulfurization being applied after decarburization, and it wouldn’t achieve the desired results either.
Just kidding. I don’t want the MDEA solution anymore. With such high levels of hydrogen sulfide, can’t desulfurization be carried out simultaneously with decarburization? Moreover, if desulfurization is more effective, then there will be problems with the regeneration of your MDEA system, and the solution itself will also be significantly affected. Are you new to this company? What was your original intention?
Thank you, classmates from USTC; I wasn’t aware of this. I haven’t gotten to the purification part yet; I’m currently working on gas generation. For oxygen-enriched modification, the high amount of CO2 generated causes the compressor to perform unnecessary work; therefore, it’s as if the CO2 is removed in advance. Hehe
I agree with the opinions from floors 2, 3, and 4. Although MDEA-based decarboxylation provides excellent desulfurization effects, practice has shown that once hydrogen sulfide enters the decarboxylation solution, it has a significant impact on the entire decarboxylation process, causing damage to equipment, clogging of fillers and distributors, and so on. It’s better to prioritize desulfurization; the lower the total sulfur content before carbon removal, the better.
Does your plant’s transformer station not have a flash tank? To remove CO2, you can reduce the pressure of the solution obtained from the desulfurization tower in the shifted gas process, thereby separating out CO2, and then pump it into the regeneration tank!
The key issue is the high H2S content in the regenerated gas; desulfurization is still necessary for it, and low pressure makes things difficult. The idea is actually good; gas conversion is used for desulfurization, while decarburization mostly causes corrosion