再热蒸汽系统的稳定性影响着燃煤机组的安全性和经济性。本文基于同一集团6台机组（A~F）的运行数据进行再热蒸汽系统的稳定性对标评价。通过3σ准则对大数据进行清洗，并利用滑动窗格法进行稳定工况划分。基于过程能力指数Cpk和变异系数CV分别对再热蒸汽温度和再热器减温水调节阀开度进行稳定性打分，并利用层次分析法-优劣解距离法对参数进行权重分配计算，完成不同机组在不同工况下的综合对标评价。结果表明：A~F机组中，E机组再热汽温对应的Cpk值最大，为1.75，其稳定性最好；F机组再热器减温水调节阀开度对应的CV值最小，为0.56，其稳定性最好；A机组的再热蒸汽温度和再热器减温水调节阀开度的稳定性最差；A机组和C机组左右汽温偏差和再热器减温水调节阀开度差明显偏大，源于其采用四角切圆方式燃烧；300 MW的E机组再热蒸汽系统的稳定性最好，百万机组再热蒸汽系统的稳定性较差。

The stability of reheat steam system of coalfired unit affects the safety and economy of the system. Based on the operation data of 6 units (A to F) of the same group corporation,the stability benchmarking evaluation of reheat steam system was carried out in this paper. The big data was cleaned through the 3σ criteria,and the stable working conditions were classified by using the sliding pane method. Based on the process capability index Cpk and coefficient of variance CV,the stability of reheat steam temperature and desuperheating water regulating valve opening of reheater was scored respectively,and the weight distribution of parameters was calculated by analytic hierarchy processtechnique for order preference by similarity to ideal solution (AHPTOPSIS) to complete the comprehensive benchmarking evaluation of different units under different working conditions. The results show that in units A to F,the corresponding value of reheat steam temperature of unit E is the largest,Cpk is 1.75,and its stability is the best; the corresponding value of desuperheating water regulating valve opening of reheater of unit F is the smallest,CV is 0.56,and its stability is the best;the stability of reheat steam temperature and desuperheating water regulating valve opening of reheater of unit A is the worst.The left and right steam temperature deviation of unit A and unit C and the difference of desuperheating water regulating valve opening of reheater are obviously too large,which is due to its fourcorner tangential combustion;the reheat steam system of 300 MW unit E has the best stability,and the reheat steam system of 1 000 MW unit has poor stability.

TK221

国家重点研发计划项目（2018YFB060420103）