河北国华定洲发电厂3 号机组为国内首台取消旁路并保留有独立增压风机的660 MW超临界空冷机组，其脱硫系统的试运过程与其他机组有很大不同。介绍了定洲电厂3 号机组湿法烟气脱硫装置封闭旁路后的试运过程，阐述了因旁路封闭引起的系统问题和解决方案，并重点分析脱硫系统影响主机可靠性的各项因素，为机组取消旁路等提供参考。

Abstract This paper introduced the test running process of dingzhou power plant’s third unit after WFGD bypass blocked out.The effection caused by bypass blocked out and the corresponding resolvents are sxpatiated.Some of this paper’s emphases are those factors which affect the reliability of this unit.