How is air removed from the distillation tower top vapor line and the compressor inlet line at the start-up of catalytic operation?
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After the anti-reaction system has maintained a temperature of 550 degrees for the required time, the blind flanges at the bottom of the distillation tower are removed. Then, while air is being expelled from both the settler and the distillation tower simultaneously, the butterfly valve at the top of the distillation tower remains closed. After steam appears at the top of the settler and the tower for half an hour, some people open the butterfly valve at the top of the distillation tower to vent the air from those areas and direct the steam to the crude gasoline tank. It is only after steam appears at the top of the crude gasoline tank for half an hour that the air-extraction process is considered complete. As for how air is expelled from the pipeline leading from the crude gasoline tank to the compressor inlet, what should be done if the butterfly valve at the compressor inlet is not airtight and steam leaks into the compressor during air expulsion? I would like to ask all of you in the marine industry: how do you remove air from the vapor line at the top of the distillation tower when starting up the unit? How do you prevent steam from entering the compressor during the switching of the steam seal, and how do you ensure that all the air in the entire system from the top of the tower to the compressor inlet is removed?
It’s contradictory – both devices are heating up, which indicates that the system has just started operating. Where does the oil and gas come from then?
No explanation needed; please read the article carefully on the 2nd floor.
Here’s a suggestion: 1. Close the distillation top disc valve tightly, and remove air from both the settler and the distillation tower at the same time. 2. Use nitrogen to displace air behind the disc valve and send it to the flare line at the inlet of the compressor unit. This nitrogen line is usually not present; it needs to be added.
We sent air directly only to the top of the distillation tower; we didn’t send air to the compressor line. Everything has been fine so far, but isn’t that unsafe?