An automatic control device and method for a desalinated water pump in a nuclear power plant

Abstract

The invention discloses an automatic control device and method for a nuclear power plant desalting water pump. The automatic control device comprises water tanks, a main pump, at least one auxiliary pump, a water outlet header pipe, a pressure detecting unit and a control unit, wherein the main pump and the auxiliary pumps are connected with the water tanks; the water outlet header pipe is connected with a pump set composed of the main pump and the auxiliary pumps; the pressure detecting unit is located in the position, at a pump set outlet, of the water outlet header pipe; and the control unit is connected with the pressure detecting unit and controls the auxiliary pumps to be started and stopped. The automatic control method comprises the steps of water pump arranging, pressure detecting and auxiliary pump control. According to the automatic control device and method for the nuclear power plant desalting water pump, flow meters of the water pump water outlet header pipe and flow signal detecting are omitted, so that fault points of a pipe network are decreased; a water pump outlet pressure signal is adopted to control the auxiliary pumps to be started and stopped, so that the water supply interruption risk caused by faults of the flow meters is avoided, and water can be continuously supplied to a nuclear power plant unit; and meanwhile, the auxiliary pump starting and stopping pressure control mode is better matched with a water pump inlet low pressure off-stream protection control mode, thus, integrated control over the system is facilitated, and the water supply safety and economy can be improved under the condition of wide-range fluctuating water supply.

Description

technical field [0001] The invention relates to the field of water pump control, in particular to an automatic control device and method for a desalinated water pump in a nuclear power plant. Background technique [0002] The desalinated water pump is an important water supply equipment of the nuclear power plant, which provides desalted water for the water system of the whole plant, including the primary circuit coolant system and the secondary circuit water supply system. In order to ensure the normal operation of the system, the desalinated water pump is not allowed to stop running during the unit operation stage. Therefore, usually 2 units share 3 desalted water pumps, all of which are fixed-speed water pumps, which are 1 main pump, 1 auxiliary pump and 1 backup pump, the main pump runs continuously, the auxiliary pump starts and stops according to the change of user flow, and the backup pump is used for the backup of the failure of the main pump and the auxiliary pump. ...

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Problems solved by technology

[0003] According to the feedback from the operation experience of nuclear power plants, due to the large number of water supply pipelines in nuclear power plants and the complicated layout, the flowmeters connected in series with the water supply main pipe by flanges are prone to failure points. The normal water supply of the unit cannot be guaranteed

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