Shutdown of the methanol washing system
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When the methanol wash system is shut down, when does the regeneration nitrogen stop? Since the first heat exchanger has no heat source, will the cold exhaust gas cause damage to the heat exchanger?
How can adjustments be made to avoid damaging the equipment?
The damage to the heat exchanger is relatively minor; since it is also a low-temperature device, you should focus on the operation of the exhaust gas scrubber, with the exhaust gas being routed directly to the bypass.
Prevent low-temperature damage to the exhaust gas scrubber tower!
The regenerated nitrogen should be switched in only after it meets the required standards; however, during this period the temperature in the exhaust gas scrubber drops below 0°C. In such cases, either low-pressure steam is introduced or a bypass around the scrubber is used (this results in increased methanol consumption and elevated total sulfur levels in the exhaust gases)
We need to see Requirement 1; it’s not detailed enough
Thank you to the original poster for the advice! When shutting down the methanol washing system, can the circulation be stopped directly without carrying out regeneration?
Don’t you have a bypass for your exhaust gas scrubber? We have one here; using the bypass will do
Our process here has a bypass, but is there still a main valve at the tower outlet? Issues with control?
There is indeed a problem; we are installed behind the pressure control valve