Purification Technology Edition: Daily Question [2018-1-10]
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What should be done in case of an instrument air failure in the low-temperature methanol washing unit? 1. Stop the pump and cease circulation. 2. Immediately close the main clean gas outlet valve and the stop valve on site. 3. Manually close the large rough gas valve. 4. Stop spraying methanol. 5. Close the high and low pressure shut-off valves, and proceed with the next steps of shutdown.
⑴ All control valves in the system are fully closed or fully open according to their valve characteristics. ⑵ Turn off the front and rear cut-off valves for LV-0216116, LV-0216014, LV-0216151, LV-0216055, LV-0216053, LV-0216003, LV-0216156, LV-0216158, LV-0216213, and LV-0216194. ⑶ Pay attention to the liquid level inside the tower; if it is too high, it should be discharged through the drain line. ⑷ Pay attention to the pressures of V021602, V021603, V021608, T021603, T021604, T021605, and T021606 to prevent overpressure; if necessary, relieve pressure through on-site drain valves or the safety valves adjacent to each tower and tank. ⑸ While performing the above operations, the system handles it as an emergency stop.
1. Stop the circulation: First stop P61301-P06, then stop the other pumps; 2. Isolate the air. 3. Stop the E61302 ammonia cooler. 4. Close all high and low pressure shut-off valves. 5. Close the ammonia evaporator stop valve and drain the condensate from the reboiler. 6. Proceed with the next step of parking.
1. Stop the pump and cease circulation. 2. Immediately close the main clean gas outlet valve and the stop valve on site. 3. Manually close the large rough gas valve. 4. Stop spraying methanol. 5. Close the high and low pressure shut-off valves, and proceed with the next steps of shutdown
1. Stop the pump and cease circulation. 2. Immediately close the main clean gas outlet valve and the stop valve on site. 3. Manually close the large rough gas valve. 4. Stop spraying methanol. 5. Close the high and low pressure shut-off valves, and proceed with the next steps of shutdown.
1. Stop the circulation: First stop P61301-P06, then stop the other pumps; 2. Isolate the air. 3. Stop the E61302 ammonia cooler. 4. Close all high and low pressure shut-off valves. 5. Close the ammonia evaporator stop valve and drain the condensate from the reboiler. 6. Proceed with the next step of parking.
1. Stop the circulation: First stop P61301-P06, then stop the other pumps; 2. Isolate the air. 3. Stop the E61302 ammonia cooler. 4. Close all high and low pressure shut-off valves. 5. Close the ammonia evaporator stop valve and drain the condensate from the reboiler. 6. Proceed with the next step of parking.
⑴ All control valves in the system are fully closed or fully open according to their valve characteristics. ⑵ Turn off the front and rear cut-off valves for LV-0216116, LV-0216014, LV-0216151, LV-0216055, LV-0216053, LV-0216003, LV-0216156, LV-0216158, LV-0216213, and LV-0216194. ⑶ Pay attention to the liquid level inside the tower; if it is too high, it should be discharged through the drain line. ⑷ Pay attention to the pressures of V021602, V021603, V021608, T021603, T021604, T021605, and T021606 to prevent overpressure; if necessary, relieve pressure through on-site drain valves or the safety valves adjacent to each tower and tank. ⑸ While performing the above operations, the system handles it as an emergency stop.
⑴All control valves in the system are fully closed or fully open according to their valve characteristics. ⑵Turn off the front and rear cut-off valves for LV-0216116, LV-0216014, LV-0216151, LV-0216055, LV-0216053, LV-0216003, LV-0216156, LV-0216158, LV-0216213, and LV-0216194. ⑶Pay attention to the liquid level inside the tower; if it is too high, it should be discharged through the drain line. ⑷Pay attention to the pressures of V021602, V021603, V021608, T021603, T021604, T021605, and T021606 to prevent overpressure; if necessary, relieve pressure through on-site drain valves or the safety valves adjacent to each tower and tank. ⑸While performing the above operations, the system handles it as an emergency stop.
1. All control valves in the system are fully closed or fully open according to their valve characteristics. 2. Turn off the front and rear cut-off valves for LV-0216116, LV-0216014, LV-0216151, LV-0216055, LV-0216053, LV-0216003, LV-0216156, LV-0216158, LV-0216213, and LV-0216194. 3. Monitor the liquid level inside the tower; if it is too high, discharge it through the drain line. 4. Pay attention to the pressures of V021602, V021603, V021608, T021603, T021604, T021605, and T021606 to prevent overpressure; if necessary, relieve pressure through on-site drain valves or the safety valves adjacent to each tower and tank. 5. While the above operations are being carried out, the system handles it as an emergency stop.