压水堆核电机组火用成本分析的矩阵算法

Matrix Algorithm of Exergy Cost Analysis on PWR Nuclear Power Units

为进行复杂能量系统的热经济学分析和评价,找出提高核电机组热经济性的新途径,基于火用经济学理论和矩阵算法,建立了压水堆核电机组热力系统火用成本分析通用模型。以某900 MW压水堆核电机组热力系统为例,进行了39股火用流的单位火用成本计算及分析,并对具体设备提出了明确的优化改进措施。结果表明:沿热力循环方向,各股火用流的单位火用成本先增加后减小;凝汽器输出火用流的单位火用成本最高,为7.1754,其次是凝结水泵和1号低压加热器,分别为5.249和4.1911。矩阵算法较常规火用成本分析法具有构造简单、矩阵元素填写法则简便、物理意义明确和规律性强等优点;利用矩阵算法的易编程性,便于开发出相应的计算及分析软件,进而为核电机组热力系统优化及故障诊断奠定理论基础。

In order to implement thermoeconomics analysis and evaluation for complex energy system and find new ways to improve the thermal economy of nuclear power unit, a general model of exergy cost analysis on thermal system of pressurized water reactor （PWR） nuclear power units was established based on exergoeconomics theory and matrix algorithm. Taking the thermal system of a 900 MW PWR nuclear power unit as an example, the unit exergy cost of 39 exergy flows were calculated and analyzed, and explicit optimization improvements were proposed for the specific equipment. The results show that the unit exergy cost of each exergy flow increases firstly and then decreases along the direction of thermodynamic cycle; the maximum unit exergy cost is that of condenser output exergy flow, which is 7. 1754, and followed by that of condensate pump and 1 low pressure heater, 5. 249 and 4. 1911 respectively. Compared with the traditional exergy cost analysis, the matrix algorithm has advantages in simple structure, convenient filling for each element of matrix, explicit physical meanings and obvious regularity. According to the programmability of matrix algorithm, a corresponding calculation and analysis software can be conveniently developed, which can provide a theoretical basis for the thermal system optimization and fault diagnosis of nuclear power units.