摘要
国内核电机组在高温季节普遍存在强迫降功率现象。为深入研究670 MW核电机组在高温季节改变循环水泵运行方式对机组输出功率的影响,在国内某核电厂4号机组进行双速泵的高低速切换实验,分析泵组在高速运行时的相关参数变化,验证循环水泵具备长期高速运行性能。同时采用MATLAB仿真平台对该机组的2台循环水泵进行模型仿真,根据机组不同循环水温度对2台双速泵的不同组合方式以及变更改造的2台变频泵进行仿真分析。分析结果表明:在高温季节,根据优化方案,通过改变双速泵的运行方式,可以在一定程度上缓解机组强迫降功率现象,平均提升机组电功率出力约1%。经变更改造后变频泵的经济性能主要体现在低温区域,水温越低,效果越明显。
The phenomenon of forced power reduction is common in domestic nuclear power units during high temperature seasons.In order to study the effect of changing operation mode of circulating water pump on output power of 670 MW nuclear power unit during high temperature seasons,a high and low speed switching experiment of dual-speed pump was conducted in Unit 4 of a domestic nuclear power plant to analyze variation of relevant parameters of high-speed operating pump,verifying circulating water pump′s competence in long-term high-speed operation.At the same time,MATLAB simulation platform was used to simulate the two circulating water pumps of the unit,and different combinations of the two dual-speed pumps and the two retrofitted inverter pumps were simulated and analyzed according to different circulating water temperatures of the unit.The analysis results show that,following the optimized plan,the forced power reduction of the unit can be alleviated to a certain extent by changing operation mode of the dual-speed pumps during high temperature seasons,and electric power output of the unit can be increased by about 1%on average.The economical cost-effectiveness of the retrofitted inverter pump is mainly ascribed in the low temperature area,as lower water temperature results in more obvious utility.
作者
唐平
TANG Ping(CNNP Nuclear Power Operation Management Co.,Ltd.,Jiaxing 314300,China)
出处
《电工技术》
2023年第22期48-52,共5页
Electric Engineering
关键词
高温季节
循环水泵
凝汽器背压
组合方式
冷端优化
变更改造
high temperature season
circulating water pump
condenser back pressure
combination method
cold-end optimization
retrofitting
