Start-stop pressure stabilizing device for standby pump of thin oil station

Abstract

The invention discloses a start-stop pressure stabilizing device for a standby pump of a thin oil station. The start-stop pressure stabilizing device comprises the thin oil station, an oil return pipe, a first valve, a thin oil station lubricating oil mother pipe, a second valve, a lubricating oil pipe and an energy accumulator; one end of the oil return pipe is connected with an oil return mother pipe of the thin oil station, the other end is connected with the lubricating oil pipe, and the first valve is arranged between the oil return pipe and the lubricating oil pipe; one end of the lubricating oil pipe is connected to the thin oil station lubricating oil mother pipe, the other end is connected to the energy accumulator, and the second valve is arranged between the thin oil station lubricating oil mother pipe and the lubricating oil pipe. According to the pressure requirement of a lubricating oil pipeline of the thin oil station, and the pressure stability of the lubricating oil pipeline of the thin oil station in the duplex pump switching or starting and stopping process can be guaranteed by selecting the proper energy accumulator and arranging the proper oil pipeline and the valves, therefore the induced draft fan tripping risk caused by the oil station protection constant value action is avoided.

Description

technical field [0001] The invention belongs to the field of thin oil stations used by induced draft fans in coal-fired power plants, and in particular relates to a start-stop pressure stabilization device for standby pumps in thin oil stations. Background technique [0002] In the thin oil station used by the induced draft fan of a coal-fired power plant, it was found that after the working pump (duplex pump) failed and stopped, the oil pressure of the lubricating oil circuit would drop during the connection of the standby pump, and the lowest could reach 0.08 MPa, low oil pressure signal alarm. When the standby pump connection delay time interval is set to 0s, the low oil pressure signal alarm still exists. In the control logic of the DCS system, it is clear that when the lubricating oil pressure of the thin oil station is lower than 0.12MPa, the induced draft fan will trip after a delay of 10s. In this case, there are potential safety hazards in the operation of the equi...

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Problems solved by technology

[0003] The object of the present invention is to provide a start-stop pressure stabilization device for the backup pump of the thin oil station. According to the pressure demand of the lubricating oil pipeline of the thin oil station, by selecting a suitable accumulator, and equipped with a suitable oil pipeline and valve, the operation of the thin oil station can be solved. During the process, if the working pump fails and the standby pump is connected, the risk of tripping of the induced draft fan due to the action of the protection setting value of the oil station can be ensured. The pressure is stable, thereby eliminating the risk of induced draft fan tripping caused by the fixed value action of the oil station protection

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