Why is the H2S level in the exhaust gas from the CO2 separation tower too high, while the CO2 content is lower than normal?
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The H2S level in the exhaust gas from the CO2 separation tower is too high, while the CO2 content is lower than normal. What could be the reasons? Note that both situations occur simultaneously.
The amount of gaseous nitrogen is low – have you started concentrating the acidic gases?
It is related to the process. Generally, it can be considered from the following aspects: whether nitrogen enters the system during the intermediate purification stage ； Is the pressure control during intermediate parsing appropriate? This can be seen from the other gas components in the CO2 product gas. If the hydrogen sulfide level is too high, check whether the levels in the exhaust gas from the concentration tower are also excessive. If so, adjust the amount of washing liquid used in the desulfurization section of the absorption tower, and analyze the sulfur content in the process gas at that section.
There are two possibilities: either the temperature of the reaction tower is too high, or the amount of methanol used for scrubbing the exhaust gases is too low.