Excess carbon monoxide in carbon monoxide exhaust gas from low-temperature methanol washing
Thread Content
This post was last edited by cuikk on 2019-7-10 06:20. High levels of carbon monoxide in exhaust gases from low-temperature methanol washing processes: Although there are standards set in a very few places for this issue, **no specific standards exist; however, high carbon monoxide emissions can trigger environmental alarms. Regarding the carbon dioxide products obtained from the low-temperature methanol washing process of feed gases with high carbon monoxide content, such as those used in methanol synthesis and coal-to-natural gas production, as well as the high levels of carbon monoxide in vent gases at 13,000 and 6,000 ppm – what methods are available to deal with this issue? Are there any better approaches? For the exchange of knowledge*. 1. Pressure reduction, flash recovery ； 2. Methanol is enriched by pressure stripping in hydrogen, and then recovered.
Is the flow rate of the methanol-poor stream set too high?
Consider medium-pressure flashing by appropriately reducing the pressure or slightly lowering the liquid level in the flash tank
Our facility has also experienced issues with excessive levels of carbon monoxide in the exhaust gases, which leads to frequent carbon monoxide alarms. We plan to carry out technical upgrades to incorporate hydrogen purification processes in order to recover carbon monoxide. Currently, we are still in the design phase; it’s not clear whether there are any mature technical solutions available in China or what their effectiveness would be
It may be better to use carbon dioxide gas stripping when the process requirements are met.
Choosing the second one should have some effect; there are similar applications available abroad
Is there any use to the teacher’s second method?
Pucheng Clean Energy Company, Shenhua Xinjiang Company, etc
Appropriately increase the amount of wash liquid at the tower top; the liquid from the medium-pressure flash tank fed into the tower is subjected to enhanced flashing before being recovered, and the amount of nitrogen stripped off is controlled appropriately