Q&A on Purification Technology [026]
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Describe the handling methods for methanol washing in the event of a plant-wide power outage (1) Manually shut down all LV and FV units to keep methanol stored in each container. (2) Stop the steam supply to the reboiler. (3) Cease the supply of ammonia to the ammonia cooler. (4) Stop nitrogen stripping. Coalification Area – Purification Technology Edition, 2017: “My Technical Upgrades” in the coal chemical industry (great rewards available). http://bbs.hcbbs.com/thread-1786290-1-1.html Registration for chemical engineers – Experience-sharing event titled “Learning from Others’ Experiences”. http://bbs.hcbbs.com/thread-1808158-1-1.html
(1) Manually shut down all LVs and FVs to store methanol in each container； (2) Steam stopped to the reboiler ； (3) Stop supplying ammonia to the ammonia cooler ； (4) Stop gas supply and remove nitrogen.
(1) Manually shut off all LVs and FVs to keep methanol stored in each container. (2) Stop the steam supply to the reboiler. (3) Cease supplying ammonia to the ammonia cooler. (4) Stop nitrogen stripping
(1) Manually shut off all LVs and FVs to keep methanol stored in each container. (2) Stop the steam supply to the reboiler. (3) Cease supplying ammonia to the ammonia cooler. (4) Stop nitrogen stripping.
(1) Manually shut off all LVs and FVs to keep methanol stored in each container. (2) Stop the steam supply to the reboiler. (3) Cease supplying ammonia to the ammonia cooler. (4) Stop nitrogen stripping
Controller: 1. Manually turn off all LV and FV units to keep methanol in each container； 2. Stop the steam to E2811 and E2815, as well as the direct steam supply to Tower C2805 ； 3. Stop ammonia supply to E2804, E2805, E2813, and E2803 ； 4. Stop gas supply and remove nitrogen ； 5. Close the series valve from C2804 to C2805.
Answer: Controller: 1. Manually turn off all LV and FV units to keep methanol in each container； 2. Stop the steam to E2811 and E2815, as well as the direct steam supply to Tower C2805 ； 3. Stop ammonia supply to E2804, E2805, E2813, and E2803 ； 4. Stop gas supply and remove nitrogen ； 5. Close the series valve from C2804 to C2805.
1) System depressurization； 2) Manually close all level and flow control valves, and store methanol in each tower ； 3) Stop reboilers E-413, E-417 ； 4) Shut down the level control valves of the ammonia coolers E-402, E-406, E-415, and E-3402, and stop supplying ammonia to the system ； 5) Stop the gas supply and remove nitrogen. After the above tasks are completed, a short-term or long-term shutdown may be carried out depending on the circumstances.
(1) Manually shut off all LVs and FVs to keep methanol stored in each container. (2) Stop the steam supply to the reboiler. (3) Cease supplying ammonia to the ammonia cooler. (4) Stop nitrogen stripping
Controller: 1. Manually shut down all LV and FV units to keep methanol in each container； 2. Stop the steam to E2811 and E2815, as well as the direct steam supply to tower C2805 ； 3. Stop ammonia supply to E2804, E2805, E2813, and E2803 ； 4. Stop gas supply and remove nitrogen ； 5. Close the series valve from C2804 to C2805.
1. Manually shut down all LVs and FVs to keep methanol stored in each container. 2. Stop the steam supply to the reboiler. 3. Cease supplying ammonia to the ammonia cooler. 4. Stop nitrogen stripping