背压变化对汽轮发电机组电功率影响的计算方法研究

目前,确定背压变化对汽轮发电机组电功率的影响尚没有一种统一的计算方法。通过计算,对工程上确定背压变化对电功率影响的常用4种计算方法进行分析和比较。在比较过程中,以计算精度较高的回热系统热平衡法的计算值为基准。比较结果表明,除等效热降法外,热力学方法和汽轮机原理方法的计算误差都很大。因此,建议工程上可以采用等效热降法计算背压变化时汽轮发电机组电功率的变化量。

Study on Calculating Method of the Affection of Back Pressure to Electric Power of Turbo-generator Set

There isn't a uniform method of calculating the affection of back pressure to electric power of steam turbine at present.In this paper,through calculating,four methods of engineering in common use are analyzed and compared.In this process,the value of the heat balance method of thermodynamic system is regarded as norm because of high precision in calculation.The result shows that the error of thermodynamics method and steam turbine theory method are very big except the equivalent enthalpy drop method.So the equivalent enthalpy drop method is suggested to calculate the change of electric power with back pressure changing in engineering.