Emergency Plan for Power Fluctuations in the PSA Unit
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Emergency Plan for Power Fluctuations in the PSA Unit: Power fluctuations in this unit (or across the entire plant) occur from various reasons. This plan is formulated to ensure the safety of the production equipment and facilities in this unit. 1. Shutdown due to power fluctuations: 1. The main operator should promptly disconnect the main power supply (or PLC power supply) in the control cabinet, to prevent accidents that may occur if the system starts operating automatically upon a sudden power restoration. 2. After notifying the operator in charge to increase the carbonization amount for production and coordinating with the dispatcher and electricians to take appropriate actions, the main operator assists the assistant operator in handling related matters. 3. Fu Cao quickly closed the inlet valve of the vacuum pump and the water inlet valve, to prevent leakage from Valve 7, which could cause the negative-pressure tower to draw water back into the tower and lead to water entering the adsorbent. 4. Close the compressor outlet valve and open the circuit valve. 5. Close the main inlet and outlet valves of the system. 6. Close the valves of all water pumps and circulation water pumps, and inform the boiler to use the dust collector’s water source instead. 7. Notify the electrician to check whether the power contacts of all devices are disconnected, to prevent the devices from starting up automatically when power is restored and getting damaged. II. Starting the machine upon receiving a call: 1. After checking and confirming there are no issues, inform the electrician to restore power supply; then turn on each water pump and the circulation water pump in sequence, and inform the boiler to resume supplying water for dust removal. 2. Turn on the computer and enter the PSA system; click the “Emergency Stop” button on the screen to bring the system to a stopped state. 3. Start the oil pump and turn on the PLC power; verify the system operation sequence and check whether the pressures in each tower are at the values corresponding to the current time. If not, the following actions must be taken: 1) Turn off the PLC power and then press the “Emergency Stop” button on the screen to keep the computer-based control system running (note: the PLC will not be active at this time), until the time and pressure values match. 2) Equalize or relieve pressure in towers with mismatched pressures to make them consistent. 4. Once the pressure matches the required value, open the main inlet and outlet valves of the system, drain the moisture from the inlet, start a vacuum pump, and activate valve V7 on the computer. 5. Click the “Emergency Stop” button on the screen to restore normal operation of the system. 6. Turn on the compressor (it needs to be turned on for multiple recycles), and turn on each vacuum pump one by one, while turning off V7 raft. 7. Notify carbonization; this system gradually increases the dosage to meet production requirements.
Plan for power fluctuations in the current position 1. Power fluctuations in this position； 1. The operator promptly closes the U-tube valve of the hot water saturation tower to prevent gas crossover, and at the same time increases the steam supply to avoid an increase in the outlet Co level. 2. The assistant operator should quickly close the outlet valve of the hot water pump, and contact the dispatch team to inform the copper washing unit to pay attention to trace amounts (or inform the hydroformylation unit to pay attention to the inlet Co level and temperature). 3. The assistant operator analyzes the outlet Co in a timely manner to provide guidance for the main operator regarding the amount of steam to be added. 4. Appropriately reduce or shut down 1# and 2# gas feed lines to prevent excessive steam addition from causing a drop in temperature, but also be careful to avoid catalyst overheating. 5. The assistant operator should contact the dispatch team to find out the cause of the power fluctuations in their area; if power supply cannot be restored in a short time, they must request the dispatch team to reduce operations or initiate a plant-wide shutdown. II. Plant-wide power fluctuations: 1. Once it is confirmed that a plant-wide power fluctuation has caused the shutdown, the main operator should promptly close the system’s steam valves and the control valves of the hot water saturation tower’s U-tubes. 2. The assistant operator should quickly close the inlet valve of the hot water pump, and pay attention to the steam pressure; if necessary, the vent valve of the steam distribution cylinder can be opened to relieve pressure. 3. Close all branch line valves and the inlet and outlet valves of the low-pressure transformer. This post was last edited by ZZJJAA70 on 2009-4-2 22:18]