压水堆核电机组加热器散热损失对机组经济性的影响

Influence of heater's heat loss on the economy of PWR nuclear power unit

针对压水堆核电机组回热和再热系统各级加热器存在散热损失的问题,笔者根据热平衡法和分析方法,从定量计算的角度阐述了回热和再热系统各级加热器散热损失对机组经济性的影响,建立了压水堆核电机组热力系统在定流量情况下全面的汽水分布矩阵和计算模型,并在此基础上,计算了由各级加热器热损造成的机组相关参数变化量。计算结果表明,相对其他加热器,高压加热器的散热损失对机组的经济性影响较大。所以,机组运行中应尽量减少高压加热器的散热损失。

Aiming at the heat loss in heaters of regenerative and reheating system of PWR nuclear power unit, the author, according to heat balance and exergy analysis, expounds the influence of heat loss of regenerative and re- heating system on the unit economy from the aspect of quantitative calculation, establishes the overall steam-water distribution matrix and exergy calculation model of PWR nuclear power unit thermal system under the condition of constant flow, and calculates the variable quantity of relevant parameters caused by heaters＇ heat loss. The calcula- tion result shows that, comparing with other heaters, the influence of the heat loss of high voltage heater on unit e- conomy is the relatively big. Therefore, the heat loss of high voltage heater should be reduced during the operation.