Regeneration of the low-temperature methanol wash system
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Is the ammonia cooler shut down during the shutdown and regeneration of the low-temperature methanol wash system?
When the low-temperature methanol washing system is shut down for regeneration, the ammonia cooler should also be stopped. It’s just necessary to flash all the liquid ammonia in the ammonia cooler. The low-temperature parking system requires rewarming. So the ammonia cooler should be stopped.
If it is only short-term parking, maintain the methanol circulation and continue to supply steam to the reboiler. The ammonia cooler continues to operate. If the parking time is too long, the methanol circulation should be stopped once degassing is complete; all the liquid will flow into its respective containers, and the ammonia cooler will be shut down. The dissolved CO2 will remain in the methanol. When operation is resumed, the CO2 will be desorbed, providing an additional source of cooling power and speeding up the startup process. If it is necessary to raise the temperature of the low-temperature methanol washing system for reasons such as maintenance, the methanol circulation can be maintained with the refrigeration unit shut down until the system warms up.
With a short parking time, the ammonia cooler can remain running. . The system continues the methanol cycle. . Regeneration. What was said upstairs. . For short-term parking. If the time is short later. Stop the methanol circulation immediately after cutting off the gas. It is CO2 remaining in methanol. It can speed up driving time. Increase the cooling rate. . The ammonia cooling system is to be shut down. . . If the unit is shut down for a long time. It also needs to stop. The system needs to warm up again
What was said upstairs is all good; there are two scenarios: short-term and long-term parking. For long-term parking, the ammonia in the ammonia cooler must be completely flashed before shutdown, and the same applies to the compressor as well