What are the reasons for the high levels of carbonyl sulfide in the methanol wash purified gas and the carbon dioxide product gas? Please ask the experts to analyze it.
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Recent analyses have shown that the COS level in the purified gas and the carbon dioxide-containing product gas is high, reaching 0.2PPM, while the hydrogen sulfide level remains normal at around 0.03PPM. Now the temperature of the regeneration tower has increased significantly, and the reflux liquid at the top of the tower has increased a lot. Due to the high level of hydrogen sulfide, it is not possible to analyze the carbonyl sulfide content in the feed gas; therefore, the amount of carbonyl sulfide in the feed gas cannot be determined. In terms of absorption efficiency, hydrogen sulfide meets the requirements; carbonyl sulfide should also meet them. So why can’t carbonyl sulfide be reduced to the required level? I would be very grateful if experts could help analyze this issue. Thank you!
This post was last edited by “I’m so stupid, wuwu” on May 17, 2018, at 08:12. In methanol washing, only a portion of carbonyl sulfide can be removed; organic sulfur is difficult to remove. The organic sulfur in raw coal gas can only be removed by converting it into hydrogen sulfide in a conversion unit. Do you deal in synthetic methanol?
The conversion of carbonyl sulfide occurs during the transformation
Analyzing the composition of the lean methanol stream suggests that it may be contaminated. The carbon removal section involving methanol washing is relatively long, and the elevated H2S levels indicate a high likelihood of problems with the lean methanol stream. If there are issues with the lean methanol, it could be due to a leak in the heat exchanger between the lean and rich streams.