Combined operation of low-temperature methanol washing
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Is the feed gas reversed during the combined operation of low-temperature methanol washing? Is steam being supplied to the regeneration tower and the water separation tower? How is the pressure in the regeneration tower controlled?
During water-cooled transportation, no process gas is used; the gas pressure is mainly provided by nitrogen! Steam should be supplied to check whether the reboiler is not operating properly!
Of course, there is no need to purge air; water flushing is a necessary step before introducing methanol. It serves to clean the system, ensure its proper operation, and check the performance of various equipment as well as the instruments. Steam cannot be supplied; without cooling, the water temperature will keep rising, and the pump will suffer from cavitation ； The airtightness testing of the system has been completed; the temperature in the cold zone is too high, and new leakage points will appear during cooling.
There is definitely no need for steam introduction; the purpose of water flushing is mainly to remove the dirtier substances in the system through the flow of water, and it also serves as a way to check the sealing quality of the system. Therefore, steam is not required during water flushing. The pressure in the regeneration tower can be adjusted by supplying nitrogen to it.
We do not supply steam to the water circulation system; if steam were used, the water temperature would increase. During water circulation, the water is discharged at the drain points of the 4 towers to flush the system. No air needs to be released during water-steam combined operation.
Water circulation serves only as a means for testing during the commissioning phase; there is no need to release air during this time. The system maintains its pressure using medium-pressure nitrogen and low-pressure nitrogen. Fluid is introduced after pressurization, in accordance with the designed pressure of each tower. As mentioned earlier, it is not necessary to use the reboiler improperly, to prevent the system temperature from rising excessively due to a lack of cooling capacity, which could lead to pump cavitation.
The feed gas will definitely not be supplied; the regeneration tower and the water separation tower will not be in operation, and the pressure in each tower is determined by the nitrogen filling valves and the venting system.