(Daily Question) Coal-to-oil and olefins forum, April 13, 2018
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3.jpg Participation: Prize of 5 Wealth； Correct answer: Reward of 10 wealth points ； Note: This post is valid for 48 hours. Question: (DMTO) Olefin separation unit: Pre-cooling of the ethylene distillation column reflux pump: (1) Verify that all drain and vent valves in the system are closed, and that the nitrogen purging has achieved the required dew point ； The sealing fluid is normal ； The turning gear is operating normally ； Lubricant level ； (2) Open the vapor line, slightly open the LD valve for vapor pre-cooling, and turn the turbine every 30 minutes ； (3) After successful gas-phase pre-cooling, close the LD; slightly open the inlet valve for liquid-phase pre-cooling, and rotate the turbine once every 30 minutes ； (4) Pre-cool until frost forms on the pump body, fully open the inlet valve, and set it aside. Note: The answers will be announced automatically in two days!
Once the reflux pump is connected to the gaseous phase ethylene, gas-phase pre-cooling of the pump can be carried out by slightly opening the pump’s exhaust valve and the liquid discharge LD valve; gas-phase pre-cooling is performed at intervals of half an hour. After frost forms on the pump, liquid-phase pre-cooling can be conducted.
(1) Verify that all drain and vent valves in the system are closed, and that the nitrogen purging dew point is within acceptable limits； The sealing fluid is normal ； The turning gear is operating normally ； Lubricant level ； (2) Open the vapor line, slightly open the LD valve for vapor pre-cooling, and turn the turbine every 30 minutes ； (3) After successful gas-phase pre-cooling, close the LD; slightly open the inlet valve for liquid-phase pre-cooling, and rotate the turbine once every 30 minutes ； (4) Pre-cool until frost forms on the pump body, fully open the inlet valve, and set it aside.
Once the reflux pump is connected to the gaseous phase ethylene, gas-phase pre-cooling of the pump can be carried out by slightly opening the pump’s exhaust valve and the liquid discharge LD valve; gas-phase pre-cooling is performed at intervals of half an hour. After frost forms on the pump, liquid-phase pre-cooling can be conducted.
Once the reflux pump is connected to the gaseous phase ethylene, gas-phase pre-cooling of the pump can be carried out by slightly opening the pump’s exhaust valve and the liquid discharge LD valve; gas-phase pre-cooling is performed at intervals of half an hour. After frost forms on the pump, liquid-phase pre-cooling can be conducted.
(1) Verify that all drain and vent valves in the system are closed, and that the nitrogen purging dew point is within acceptable limits； The sealing fluid is normal ； The turning gear is operating normally ； Lubricant level ； (2) Open the vapor line, slightly open the LD valve for vapor pre-cooling, and turn the turbine every 30 minutes ； (3) After successful gas-phase pre-cooling, close the LD; slightly open the inlet valve for liquid-phase pre-cooling, and rotate the turbine once every 30 minutes ； (4) Pre-cool until frost forms on the pump body, fully open the inlet valve, and set it aside.
Once the reflux pump is connected to the gaseous phase ethylene, gas-phase pre-cooling of the pump can be carried out by slightly opening the pump’s exhaust valve and the liquid discharge LD valve; gas-phase pre-cooling is performed at intervals of half an hour. After frost forms on the pump, liquid-phase pre-cooling can be conducted.
Once the reflux pump is connected to the gaseous phase ethylene, gas-phase pre-cooling of the pump can be carried out by slightly opening the pump’s exhaust valve and the liquid discharge LD valve; gas-phase pre-cooling is performed at intervals of half an hour. After frost forms on the pump, liquid-phase pre-cooling can be conducted.
Once the reflux pump is connected to the gaseous phase ethylene, gas-phase pre-cooling of the pump can be carried out by slightly opening the pump’s exhaust valve and the liquid discharge LD valve; gas-phase pre-cooling is performed at intervals of half an hour. After frost forms on the pump, liquid-phase pre-cooling can be conducted.
Once the reflux pump is connected to the gaseous phase ethylene, gas-phase pre-cooling of the pump can be carried out by slightly opening the pump’s exhaust valve and the liquid discharge LD valve; gas-phase pre-cooling is performed at intervals of half an hour. After frost forms on the pump, liquid-phase pre-cooling can be conducted.
(1) Verify that all drain and vent valves in the system are closed, and that the nitrogen purging dew point is within acceptable limits； The sealing fluid is normal ； The turning gear is operating normally ； Lubricant level ； (2) Open the vapor line, slightly open the LD valve for vapor pre-cooling, and turn the turbine every 30 minutes ； (3) After successful gas-phase pre-cooling, close the LD; slightly open the inlet valve for liquid-phase pre-cooling, and rotate the turbine once every 30 minutes ； (4) Pre-cool until frost forms on the pump body, fully open the inlet valve, and set it in standby mode