How to address high carbon dioxide levels in low-temperature methanol washing units
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How to address high carbon dioxide levels in low-temperature methanol washing units
Please, HAIYOU on the first floor, explain the problem clearly so that everyone can help analyze it. Is it the high CO2 content in the purified gas after the absorption tower? What type of process is being used?
Well, you still haven’t mentioned where the CO2 level is high
Put it more clearly. . It should. . Where is the water content high? . Where is the feed gas still from?
1 Insufficient amount of methanol used for washing. 2 Low pressure and high temperature in the absorption tower. 3 Insufficient purity of methanol. 4 The regenerated methanol is of poor quality. 5 Caused by internal leaks in the equipment
If it’s about dealing with high CO2 levels in the air, the answer above is correct. A low amount of methanol used for washing can also be attributed to an insufficient methanol circulation rate; it is necessary to increase this circulation rate. Of course, such increases should not be made abruptly – a gradual approach is the principle, as otherwise it is easy for certain liquid levels in the system to become too high while other levels become too low, leading to sequential shutdowns of the system. During operation, pressure changes in the absorption tower generally do not occur; usually, it is an increase in methanol temperature that leads to a decrease in absorption capacity. This involves the balance of cooling capacity. If it is due to environmental factors, such as excessively high ambient temperatures in summer that result in insufficient cooling capacity from the chillers, then it is necessary to reduce the load. This issue is generally the main factor limiting the operating capacity of the low-temperature methanol washing system. If it is not an environmental problem, it might be some kind of operational error that has caused an imbalance in the cooling capacity. The purity of the regenerated methanol and methanol itself is not up to standard; as a result, the absorption capacity of methanol decreases, and the CO2 level at the top of the tower also becomes too high.