Improved Algorithm Based on Equivalent Enthalpy Drop Method of Pressurized Water Reactor Nuclear Steam Turbine
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摘要: 由于核电汽轮机抽汽状态点焓值及排汽焓难以准确确定,使得压水堆核电机组常规等效热降法计算结果存在偏差。针对这一问题,提出压水堆核电机组等效热降法的改进算法。对1000 MW压水堆核电机组二回路热力系统进行实例计算,结果表明:用等效热降法的改进算法所得的汽轮机实际循环热效率与设计值相比较,误差在允许的范围内。等效热降法的改进算法基于等熵膨胀过程,核电汽轮机抽汽状态点焓值及排汽焓可以准确确定,在实际运用中比常规等效热降法更合理、更准确。Abstract: Because it is difficulty to accurately determine the extraction steam turbine enthalpy and the exhaust enthalpy,the calculated result from the conventional equivalent enthalpy drop method of PWR nuclear steam turbine is not accurate.This paper presents the improved algorithm on the equivalent enthalpy drop method of PWR nuclear steam turbine to solve this problem and takes the secondary circuit thermal system calculation of 1000MW PWR as an example.The results show that,comparing with the design value,the error of actual thermal efficiency of the steam turbine cycle obtained by the improved algorithm is within the allowable range.Since the improved method is based on the is entropic expansion process,the extraction steam turbine enthalpy and the exhaust enthalpy can be determined accurately,which is more reasonable and accurate compared to the traditional equivalent enthalpy drop method.
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