15. What are the hazards of excessive H2S in the feed gas for low-temperature methanol washing?
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1. What are the hazards of excessive H2S in the feed gas for low-temperature methanol washing?
The H2S content in the feed gas is closely related to the sulfur content of the coal; when the sulfur content of the coal changes, it is necessary to adjust the circulation rate of the lean methanol in the low-temperature methanol washing process in a timely manner, in order to prevent the sulfur content in the purified gas from exceeding the specified limits due to high H2S levels in the feed gas.
The cause should be sought in the coal quality, starting with the composition of the raw coal, in order to bring the total sulfur content of the raw gas back within the specified range; at the same time, enhanced analysis and purification measures should be taken, with adjustments made as appropriate
It is usually caused by an increase in the sulfur content in the raw coal, and adjustments are made during gasification. . . . . . . . . . . . . . . .
If the type of coal and the previous systems cannot be changed or adjusted, then this system can only adjust its operational parameters in a timely manner to ensure that the purified gas meets the required standards and that the exhaust gases are discharged properly. Focusing on these two points is sufficient; it’s already quite good if an operator can achieve these goals. Any other issues fall under the responsibility of those who make decisions； But if it is not possible to ensure timely reporting to decision-makers so that solutions can be sought
The function of low-temperature methanol washing is to remove acidic components, and the level of H2S in the feed gas depends on the type of coal used. If the H2S level is too high, it is necessary to either switch to a different type of coal or adjust the operating conditions to bring the level back to normal.
Different coal types have different sulfur contents. High sulfur content can also corrode the raw gas heat exchanger, leading to internal leakage. Take proper protective measures.