【摘要】 为评估汽轮机热力性能试验中参数测量误差对性能指标影响,基于误差传递理论,利用泰勒级数和数值微分等数值分析方法,建立了无需参数修正曲线和性能指标计算函数的计算式。以某电厂600 MW机组为例,利用该算法计算了参数测量误差对性能指标的影响,并和传统计算方法的结果进行了比较。结果表明:本研究提出的数值误差分析算法和传统方法计算的机组热耗率不确定度的误差为0.023%。该算法是传统误差分析方法使用条件难以满足情况下,用以计算测量参数误差对机组性能指标影响的一种有效方法。更多还原

【Abstract】 Based on the error transfer theory and by using the numerical analytic theory such as Taylor series and numerical differential etc.,presented was a numerical calculation method for evaluating the influence of the measurement errors of parameters during the thermodynamic performance test of a steam turbine on its performance indexes not needing any parameter correction curves and performance index calculation function partial differential equations.With the test data of a 600 MW unit in a power plant serving as the object,the algorithm in question was used to calculate the influence of the measurement errors of parameters on the performance indexes and the calculated results were compared with those obtained by using the conventional calculation method.It has been found that the uncertainty error of the heat rate of the unit calculated by using the numerical error analytic method proposed by the authors and the conventional calculation method is only 0.023%,which is very small and such a result is reliable,indicating that the error analytic calculation method under discussion is correct.Therefore,it is an effective method for calculating the influence of measurement errors of parameters on the performance index of a unit when the conditions for using the conventional error analytic method are difficult to meet.更多还原