再热汽温变化对煤耗率影响的强度计算模型

再热温度的改变会对机组的热经济性产生影响,文中在火电机组热经济性分析的统一物理模型和数学模型的基础上,推导出了再热汽温对火电机组发电煤耗率影响的通用强度计算模型。该推导方法推导过程简单、物理意义明确,且在应用时只需计算温度变化与强度系数的乘积就可得到煤耗率的变化量。以国产600 MW机组的典型工况为例进行了算例分析,计算结果表明应用该模型在计算时计算量小、精度高。强度系数的提出为火电机组节能降耗以及热力系统定量分析提供了理论依据。

The Strength Calculation Model about Reheat Temperature Changes’s Influences on Coal Consumption Rate

The reheat temperature change directly influences the Thermo-Economics of power unit.Basing on unified physical model and mathematical model about Thermo-Economics Analysis for coal-fired power unit,this paper deduces a General strength calculation matrix.This method has much easier derivation procedures and explicit physical meaning,at the same time,when used,nothing remains but to get the product of temperature change and strength factor.By calculating typical working conditions of domestic 600MW unit,we conclude that this method has little calculated quantities and high accuracies.The concept of "intensity coefficients" supplies a theoretical basis for energy saving of coal-fired power unit and thermal system quantitative analysis.