火电机组的热经济性分析

为进行整个火电机组的能量系统热经济性分析及考察其组元变化的影响，提出了以热经济学和边际成本概念为基础的热经济性分析方法。对复杂能量系统主要以功能划分后形成的组元，考察其组元的输出炯流变化引起整个系统的能耗变化，可以通过边际炯成本、单位炯成本和组元产品的函数来表达，来衡量整个系统所有组元的输出炯流变化对系统外部输入燃料的影响，便于火电机组的运行经济状态动态评估。通过300MW机组主蒸汽参数变化的计算表明：参数变化时将引起系统的煤耗增加，降低了经济性，因而从本质上进行了热经济性的全面综合分析，以优化机组运行，进行性能诊断。图1表2参10

Economic Analysis of Thermal Power Plant

An analysis model for thermal efficiency is established based on thermoeconomics theory and marginal exergy cost. Its task is economic analysis of thermal power plant and to know the influence of component-parameter change. The complex energy system is divided into the components by their main functions. The change of component-output-exergy flow will bring an energy consumption variation of the whole system. The variation is expressed by the mathematic function of marginal exergy cost, unit exergy cost and component product, in order to know the component-input-exergy flow how to affect the input fuel outside the system. Thus, the operation economic state can be evaluated dynamically in thermal power plant. A calculation for 300 MW unit has been proceeded in main-steam-parameter change. It shows that the coal consumption increases with parameters, which reduces the unit efficiency. And therefore, the method can entirely analyze system efficiency in nature, in order to optimize unit operation and to diagnose its performance. Fig 1, tables 2 and refs 10.