Purification Technology Q&A Version [042]
Thread Content
How to handle the feed gas when low-temperature methanol washing is suspended? 1) Close the inlet and outlet system isolation valves; close one of the stop valves as appropriate ； 2) Close the liquid ammonia inlet stop valve of the ammonia cooler, and close the methanol spray valve ； 3) Contact the dispatcher to stop feeding gas to the sulfur recovery unit, and vent the system. The sulfur recovery unit is shut down, and the acidic gases are diverted to the flare ； 4) Keep the system operating at its minimum circulation rate; use nitrogen to pressurize it when the pressure is low ； 5) Stop the stripping nitrogen in the stripping tower, and stop the compressor (it can remain operational depending on the situation). Based on the length of time the vehicle has been parked, it is determined whether to proceed with the scheduled parking procedure. Coalification Region Purification Technology Edition – 2017 Coal Chemical Industry “My Technical Upgrades” Contest (Generous Prizes Available) http://bbs.hcbbs.com/thread-1786290-1-1.html Registration for Chemical Engineers – Experience Sharing Event “Learning from Others’ Experiences” http://bbs.hcbbs.com/thread-1808158-1-1.html
1) Close the inlet and outlet system isolation valves; close one of the stop valves as appropriate； 2) Close the liquid ammonia inlet stop valve of the ammonia cooler, and close the methanol spray valve ； 3) Contact the dispatcher to stop feeding gas to the sulfur recovery unit, and vent the system. The sulfur recovery unit is shut down, and the acidic gases are diverted to the flare ； 4) Keep the system operating at its minimum circulation rate; use nitrogen to pressurize it when the pressure is low ； 5) Stop the stripping nitrogen in the stripping tower, and stop the compressor (it can remain operational depending on the situation). Based on the length of time the vehicle has been parked, it is determined whether to proceed with the scheduled parking procedure.
1) Close the inlet and outlet system isolation valves； Close one of its stop valves as appropriate ； 2) Close the liquid ammonia inlet stop valve of the ammonia cooler, and close the methanol spray valve ； 3) Contact the dispatcher to stop feeding gas to the sulfur recovery unit, and vent the system. The sulfur recovery unit is shut down, and the acidic gases are diverted to the flare ； 4) Keep the system operating at its minimum circulation rate; use nitrogen to pressurize it when the pressure is low ； 5) Stop the stripping nitrogen in the stripping tower, and stop the compressor (it can remain operational depending on the situation). Based on the length of time the vehicle has been parked, it is determined whether to proceed with the scheduled parking procedure.
1) Close the inlet and outlet system isolation valves; close one of the stop valves as appropriate； 2) Close the liquid ammonia inlet stop valve of the ammonia cooler, and close the methanol spray valve ； 3) Contact the dispatcher to stop feeding gas to the sulfur recovery unit, and vent the system. The sulfur recovery unit is shut down, and the acidic gases are diverted to the flare ； 4) Keep the system operating at its minimum circulation rate; use nitrogen to pressurize it when the pressure is low ； 5) Stop the stripping nitrogen in the stripping tower, and stop the compressor (it can remain operational depending on the situation). Based on the length of time the vehicle has been parked, it is determined whether to proceed with the scheduled parking procedure.
If the feed gas is suspended, the low-temperature methanol washing unit first closes the isolation valves for product gases such as syngas, CO2, and Claus gas that are sent out. In this case, the low-temperature methanol plant can maintain the continuous circulation of methanol ； If the time is too long, continuous nitrogen supply is required to maintain the methanol cycle.
1) Close the inlet and outlet system isolation valves; close one of the stop valves as appropriate； 2) Close the liquid ammonia inlet stop valve of the ammonia cooler, and close the methanol spray valve ； 3) Contact the dispatcher to stop feeding gas to the sulfur recovery unit, and vent the system. The sulfur recovery unit is shut down, and the acidic gases are diverted to the flare ； 4) Keep the system operating at its minimum circulation rate; use nitrogen to pressurize it when the pressure is low ； 5) Stop the stripping nitrogen in the stripping tower, and stop the compressor (it can remain operational depending on the situation). Based on the length of time the vehicle has been parked, it is determined whether to proceed with the scheduled parking procedure.
1. Close the inlet and outlet system shut-off valves; close one of the globe valves as appropriate. 2. Close the cut-off valve at the liquid level inlet of the ammonia cooler, and close the methanol spray valve. 3. Contact the dispatch team to stop feeding gas to the sulfur recovery unit, and vent the system. 1. Stop sulfur recovery; divert the acid gas to the flare. 4. Keep the system operating at its minimum circulation rate, and use nitrogen to maintain pressure when it drops. 5. Stop the nitrogen used for stripping in the stripping tower and shut down the compressor. Decide whether to continue with the planned shutdown procedures depending on the duration of the shutdown
1) Close the inlet and outlet system isolation valves; close one of the stop valves as appropriate； 2) Close the liquid ammonia inlet stop valve of the ammonia cooler, and close the methanol spray valve ； 3) Contact the dispatcher to stop feeding gas to the sulfur recovery unit, and vent the system. The sulfur recovery unit is shut down, and the acidic gases are diverted to the flare ； 4) Keep the system operating at its minimum circulation rate; use nitrogen to pressurize it when the pressure is low ； 5) Stop the nitrogen used for aeration in the aeration tower, and shut down the compressor (it may continue to operate depending on the circumstances). Decide whether to proceed with the planned shutdown procedure based on the duration of the shutdown.
1) Close the inlet and outlet system isolation valves; close one of the stop valves as appropriate； 2) Close the liquid ammonia inlet stop valve of the ammonia cooler, and close the methanol spray valve ； 3) Contact the dispatcher to stop feeding gas to the sulfur recovery unit, and vent the system. The sulfur recovery unit is shut down, and the acidic gases are diverted to the flare ； 4) Keep the system operating at its minimum circulation rate; use nitrogen to pressurize it when the pressure is low ； 5) Stop the stripping nitrogen in the stripping tower, and stop the compressor (it can remain operational depending on the situation). Decide whether to continue with the scheduled parking procedure based on the length of time the vehicle has been parked
Pause the feed gas; the methanol circulation can remain operating normally for a short period of time. Methanol is sprayed, with nitrogen gas flowing continuously.