Impact of system pressurization during startup on the compression system (prior to the alkali scrubber) in an ethylene plant

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This post was last edited by MTO001 on 2021-10-3 22:45. What is the impact of system pressure levels at startup on the startup process? When starting up the pyrolysis gas compressor for the first time, nitrogen or natural gas can be used as the starting material. When starting up with natural gas, in addition to using a coolant for cooling, throttling itself can also provide cooling, and it is even possible to produce liquid methane. Material loss can be reduced during feeding. Using quench oil and quench water towers as the air source for the compressor allows effective prevention of negative pressure during the transcritical phase. The level of pressure in the system also has an impact on it; if the pressure is too low (below 80 KPa), it may result in very low pressures, or even a negative pressure in the tank. During the transcritical phase, it is necessary to open the pressure compensation valve promptly on-site (using nitrogen or natural gas), while being careful of the effects of fluctuations in the pipeline system.