Renovation of the oil removal line and washing line in the stable production area

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1) Add a new water injection line at the outlet of the crude gasoline pump (P3202/A); a DN80 pipeline is connected to the crude gasoline stabilization system. This facilitates the injection of water to push the oil upward after the stabilization system is shut down, avoids conflicts that may occur during water washing in the distillation system, and reduces the downtime. 2) Two new oil return lines have been added: (1) A DN80 pipeline has been installed in front of the regulator for the lean absorbent oil (diesel), connecting it to the light contaminated oil line. This allows the lean absorbent oil to be sent directly to the unqualified tank during shutdowns, thereby preventing secondary contamination during oil removal and cleaning processes, and essentially avoiding any discharge of oil into the sewers. (2) A new DN80 pipeline has been added in front of the dry gas control valve (PC1301) and is connected to the light dirty oil line. This allows any residual oil to be pushed into V3303 during shutdown periods when water is used to push oil upward; from there, it travels through the non-condensable gas line (dry gas pre-lift) to PC1301. The newly added pipeline then enables the oil to be sent back to the light dirty oil line and subsequently to the storage tank area. This approach prevents the oil from not being pushed out cleanly by water or from causing secondary contamination, as well as avoiding the discharge of oil into drains. Using this line, it is also possible to fill the stabilizer and absorber with gas simultaneously during startup. Increase the gas filling speed to boost the startup speed. Additionally: Due to the impact of the feed liquid, the level of the liquid level gauge fluctuates significantly. In this instance, protective plates were installed on certain pressure tapping pipes inside the stabilizer, and these have proven effective after operation began. Personal experience is for reference only