火电机组辅助汽水系统热经济性矩阵分析方法

Matrix Analysis Method of Thermal Economy of the Auxiliary Steam-water System for the Coal-fired Power Unit

在分析机组回热抽汽量变化对机组作功量和吸热量影响的基础上,得出回热抽汽效率矩阵和再热吸热系数矩阵,然后推导出计算辅助汽水系统对机组作功量和吸热量影响的矩阵增量方程,并建立了煤耗率微增量方程。该方程可以直接计算各辅助汽水流量引起的机组煤耗率的变化值,提出了一种从机组作功量和吸热量变化的角度对热力系统辅助汽水系统热经济性进行深入分析的新方法,并通过实例对该分析方法进行了验证。

Based on the analysis of the influence on the work done and heat absorption of unit by the variation of unit＇s steam extraction, the steam extraction efficiency matrix equation and the reheat absorption modulus matrix equation were obtained, in a following step the matrix increment equation for calculating the influence of auxiliary steam-water system on the work done and heat absorption of unit was deduced, and the coal consumption rate micro-increment equation was built. This equation can directly calculate the variation of coal consumption rate caused by the auxiliary steam-water flow, and present a new method which can make a deep analysis for the thermal economy of auxiliary steam-water system form the aspect of the variation of unit＇s work done and heat absorption. The analysis method was validated by an actual example.