火电机组回热系统结构系数计算方程

Structural Coefficient Calculation Equation for Regenerative System of a Coal-fired Power Unit

以定功率为条件,利用矩阵法和偏微分理论建立了火电机组回热系统结构系数通用计算方程,利用该方程计算出回热系统各处的结构键系数σi和外部键系数βi,并以N-1000机组为例进行了计算和分析.结果表明:火电机组回热系统结构系数可以反映各加热器损以及局部输入对整个回热系统损或输入的影响,把系统的局部改善纳入到对系统的整体影响进行观察,以便确定回热系统的节能重点,并为火电机组设计优化方案的选择提供参考.

Based on matrix method and theory of partial differentiation, structural coefficient calculation equations for regenerative system of coal-fired power units were proposed under constant output conditions, with which the coefficient σi of structural bonds and coefficient β1, of external bonds were calculated and analyzed throughout the regenerative system of an N-1000 unit. Results show that above coefficients can reflect the impact of local exergy loss and input exergy of all heaters on overall exergy loss and input exergy of the whole regenerative system, which therefore may serve as a reference for design optimization of coalfired power units through improvements on local systems.