How can the restart time be significantly reduced after a short-term shutdown in low-temperature methanol washing?

This post was last edited by 654262293 on 2010-7-9 at 16:56. The methanol circulation was stopped promptly, gas supply for nitrogen extraction was halted, as well as operation of the methanol thermal regeneration tower and the water separation tower. This prevented further desorption of CO2 from the methanol in the carbon dioxide desorption tower and the hydrogen sulfide concentration tower, thus maintaining the cooling capacity of the methanol in the cold zone. In this way, the temperature of the circulating methanol does not rise too much. Before establishing a methanol circulation while driving the system, it is necessary to operate the heat regeneration tower and the water separation tower first, and then start the pumps to create the circulation. This results in a relatively lower temperature of the circulating methanol; thanks to the washing effect of methanol at this lower temperature, the purified gas can be made qualified more quickly.

Simply put: stop all operations, maintain temperature and pressure, and it’s easy to introduce gas again.

During an emergency stop, the system is shut down to maintain cold storage and pressure. Gas is introduced simultaneously during the methanol circulation, which results in less heat loss and allows the purified gas to meet the required standards more quickly; it takes 3.5 hours from the start of the methanol circulation until the purified gas is ready.