1000 MW机组供电煤耗反平衡计算影响因素分析

1000 MW unit net coal consumption counter balance calculation influence factor analysis

某电厂1 000 MW超超临界机组生产报表系统中反平衡供电煤耗与正平衡供电煤耗相比,数值波动大,不符合公司正反平衡供电煤耗差值小于2%的要求。为了查找原因,应用热平衡对机组性能计算,定量分析影响反平衡供电煤耗计算的因素,得出参数测量误差、不明泄漏量、给水泵密封水流量等对供电煤耗的影响,改进了实时热耗率计算公式,提高供电煤耗反平衡计算的准确性。

In the production statement system of a power plant's1 000 MW ultra-supercritical unit,the counter balance net coal consumption value fluctuation is bigger than positive balance net coal consumption. Which did not satisfy the requirement of difference of positive balance and counter balance net coal consumption shall be less than 2%. To find the causes,heat balance was applied to evaluate unit performance. Factors that could influence counter balance net coal consumption were quantitively analyzed. The measurement tolerance,unknown leakage quantity,water supply pump seal leakage quantity and other factors were indicated. Real-time heat rate formula and accuracy of counter balance calculation was improved.