Cause Analysis and Countermeasures of Pressure Interlock of Lubricating Oil in Feed Pump of Hydrogenation Unit
The feed pump is one of the key equipments in the hydrogenation unit.When the residual oil hydrogenation unit of a company was put into operation in 2015,two abnormal production events occurred consecutively,which caused the emergency shutdown of the feed pump due to the lubricating oil pressure low and low interlock.Starting from the lubricating oil system,the differences between the lubricating oil pressure relief design of similar equipment and the matching oil station were analyzed and compared.Through the oil pressure interlock test,the main reasons for the zero-outlet pressure of the lubricating oil backup pump are the defects in the original design of the oil tank,the small capacity of the oil tank,and the accumulation of oil and gas at the inlet elbow of the lubricating oil pump.Some measures,such as adding exhaust facilities,cutting off the inlet elbow of the lubricating oil pump,and moving the pressure measuring point of the self-starting lubricating oil backup pump signal to the check valve on the oil supply main pipe,were proposed to solve the problem of the lubricating oil backup pump with gas for a long time and effectively guarantee the safe and stable operation of the production unit.
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