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What is the basis for determining the methanol circulation rate in the low-temperature methanol washing unit? How can this circulation rate be minimized?
The methanol circulation rate is determined based on the principle of ensuring that the CO2 level exiting the tower does not exceed the specified limits; it is necessary to minimize the temperature of all materials entering the methanol scrubber, while simultaneously maintaining a balance of cooling capacity in the system. To minimize the circulation volume, the following points should be noted: (1) When increasing the load after 80% load, it must be done slowly to ensure that the cooling capacity from the low-pressure area can be delivered in a timely manner; (2) The cooling capacity of the ammonia cooler must be adjusted promptly