凝结水过冷度变化对机组热经济性的影响

Degree of Supercooling of Condensate Influences of Thermal Economics

对大型机组凝汽器凝结水过冷度的机理进行分析,基于热力系统结构矩阵理论和小扰动原理分析凝结水过冷度变化对机组热经济性的影响,建立计算模型。以某电厂1 000 MW机组为例进行理论计算,结果表明:随着凝结水过冷度的增大,机组热经济性降低,煤耗率呈线性增加。该模型计算简便、通用性强。

Through the analysis is made on the mechanism of degree of supercooling for the targe unit, and based on the thermal sys- tem structure matrix theory and the small disturbance, the principle of the condensate supercooling degree change on the thermal through sexual influence is analysed by calculation model. Taking one 1 000 MW unit as＇example, the results show that with the in- creasing of degree of supercooling, the thermal efficiency of units reduces, the coal consumption rate increases linearly. The model has the features of versatility and simplicity.