Nuclear power station plant water pump shaft seal water supply system

Abstract

The invention provides a nuclear power station plant water pump shaft seal water supply system, and belongs to the technical field of water pump shaft seal water supply. The nuclear power station plant water pump shaft seal water supply system comprises a production water distribution system, a water supply pipeline connected with the production water distribution system and a plant water pump, an emergency water supply pipeline arranged between a water outlet of the plant water pump and the water supply pipeline, a pressure reducing device arranged on the emergency water supply pipeline, and a first check valve arranged on the water supply pipeline and located on the upstream portion of the position connected with the emergency water supply pipeline, wherein the water pressure of the end, close to the water supply pipeline, of the pressure reducing device in the emergency water supply pipeline is lower than the water pressure in the water supply pipeline, and the water pressure in the water supply pipeline is lower than the water pressure of the water outlet of the plant water pump. According to the nuclear power station plant water pump shaft seal water supply system, the shaft seal water source can be automatically switched, independence and reliability of shaft seal water are guaranteed, the service life of a shaft seal is prolonged, and therefore the unit running safety and economical efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of pump shaft seal water supply, in particular to a pump shaft seal water supply system for nuclear power plants. Background technique [0002] The fluid sucked by the plant water pump of nuclear power plant is seawater containing sediment and salt. At present, the plant water pump is mature and the common shaft seal water supply system has two forms. One form is to provide the shaft seal water of the pump by several clean fresh water pipelines. It is called scheme A; the other starts from the independence of pump operation, and the shaft seal water is provided by the pump itself, which is called scheme B. [0003] In scheme A, under normal conditions, the shaft seal water is provided by the drinking water system and raw water system from the water plant, and the two water sources share the common water supply main pipe. In the event of damage to the common water supply main, shaft seal water is provided by...

AI Technical Summary

Problems solved by technology

Although the plant water pump in this scheme does not require external supply of shaft seal water, the pump has high independence in operation, but in the start-up phase of the pump, the pump cannot provide shaft seal water for itself. At this time, the pump must be started with dry friction. In addition, during normal operation The shaft seal water provided by the pump is seawater containing sediment and salt, which will cause serious wear and tear on the shaft seal, thus affecting the life of the shaft seal

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