某电厂超临界机组在投产后汽机调节级压力逐步升高.检修中发现汽机高压缸通流部分存在较严重的结垢,严重影响机组带额定负荷运行.通过对垢样的分析,确定了造成高压缸通流部分结垢的原因.针对这些原因,采取了高、中压缸通流部分喷丸除垢、锅炉酸洗和化学精处理系统消缺等一系列措施,使该机组检修后调节级压力和铭牌出力恢复正常,调节级压力高的问题得到了彻底解决.%The governing stage pressure of a supercritical steam turbine has been increasing since the unit commitment. During thernoverhaul, scaling is discovered on the turbine blades, which seriously influences the turbine operated at rated load. The analysis on therndeposits finally discloses the reasons for scaling. Some measures such as shotpeening for the HP and IP flow paths, acid washing for thernboiler and defect elimination for the water precision treatment equipment, are taken, which enables the turbine governing stage pressure torndrop to the designed value and the turbine to carry the rated load. Therefore, the problem of high governing stage pressure is solvedrnthoroughly.
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