Nuclear power plant steam generator blowdown system and flow regulating valve anti-cavitation method thereof

核电厂蒸汽发生器排污系统及其流量调节阀防汽蚀方法

Abstract

本发明公开了一种核电厂蒸汽发生器排污系统及其流量调节阀防汽蚀方法,所述排污系统包括排污管线、热交换器、流量调节阀、流量计、过滤除盐净化单元和凝汽器,排污管线连接在蒸汽发生器与凝汽器之间,热交换器、流量调节阀、流量计和过滤除盐净化单元分别设置在排污管线上,所述防汽蚀方法通过在流量调节阀与凝汽器之间排污管线上设置节流元件,来提高流量调节阀下游出口的压力,从而降低流量调节阀所承担的压降,达到消除阀门汽蚀的影响。与现有技术相比,本发明核电厂蒸汽发生器排污系统通过增设的节流元件提高了流量调节阀下游出口的压力,从而使流量调节阀无需在汽蚀工况下工作而延长了使用寿命。
The invention discloses a nuclear power plant steam generator blowdown system and a flow regulating valve anti-cavitation method thereof. The blowdown system comprises a blowdown pipeline, a heat exchanger, a flow regulating valve, a flowmeter, a filtering and desalting purification unit and a condenser, wherein the blowdown pipeline is connected between a steam generator and the condenser; the heat exchanger, the flow regulating valve, the flowmeter and the filtering and desalting purification unit are arranged on the blowdown pipeline. According to the anti-cavitation method, a throttling element is arranged on the blowdown pipeline between the flow regulating valve and the condenser, so that the pressure of a downstream outlet of the flow regulating valve is improved, and the pressure drop of the flow regulating valve is reduced to eliminate the influence on valve cavitation. Compared with the prior art, the nuclear power plant steam generator blowdown system has the advantage that the pressure of the downstream outlet of the flow regulating valve is improved through the throttling element additionally arranged on the nuclear power plant steam generator blowdown system disclosed by the invention, so that the flow regulating valve does not need to work under a cavitation working condition, and the service life is prolonged.

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