中国电力
中國電力
중국전력
ELECTRIC POWER
2010年
5期
35-37
,共3页
龙毅%沈丁杰%李雪%曾劲松%彭欣
龍毅%瀋丁傑%李雪%曾勁鬆%彭訢
룡의%침정걸%리설%증경송%팽흔
超临界机组%汽轮机%低压转子%末级叶片%损坏分析
超臨界機組%汽輪機%低壓轉子%末級葉片%損壞分析
초림계궤조%기륜궤%저압전자%말급협편%손배분석
super critical unit%steam turbine%low-pressure rotor%last stage blade%damage analysis
介绍某发电厂发生的一起超临界机组低压转子末级叶片损坏事故,宏观检查发现是因为反向第6级蜂窝汽封跌落引起的.进一步开展材质分析、力学性能试验、金相试验,并对蜂窝汽封的加工工艺综合分析,得出如下结论:钎焊工艺影响了汽封体的原始热处理状态,使汽封体的综合机械性能下降,而且汽封体结构不合理,加上运行蒸汽的冲击,导致汽封体跌落断裂,造成末级叶片损坏.分析结论对汽轮机的检修、改造具有指导意义.
介紹某髮電廠髮生的一起超臨界機組低壓轉子末級葉片損壞事故,宏觀檢查髮現是因為反嚮第6級蜂窩汽封跌落引起的.進一步開展材質分析、力學性能試驗、金相試驗,併對蜂窩汽封的加工工藝綜閤分析,得齣如下結論:釬銲工藝影響瞭汽封體的原始熱處理狀態,使汽封體的綜閤機械性能下降,而且汽封體結構不閤理,加上運行蒸汽的遲擊,導緻汽封體跌落斷裂,造成末級葉片損壞.分析結論對汽輪機的檢脩、改造具有指導意義.
개소모발전엄발생적일기초림계궤조저압전자말급협편손배사고,굉관검사발현시인위반향제6급봉와기봉질락인기적.진일보개전재질분석、역학성능시험、금상시험,병대봉와기봉적가공공예종합분석,득출여하결론:천한공예영향료기봉체적원시열처리상태,사기봉체적종합궤계성능하강,이차기봉체결구불합리,가상운행증기적충격,도치기봉체질락단렬,조성말급협편손배.분석결론대기륜궤적검수、개조구유지도의의.
The falling of reverse 6th honeycomb seals damaged some last stage blades of low-pressure rotor of super critical unit in a power plant. By macroscopical checking, material analysis, mechanical properties testing, metallography testing and the comprehensive analysis of the processing technic of the honeycomb steam seal, it could be deduced that brazing procedure affected the original heat treatment conditions of the honeycomb seal, which led to the mechanical performance reduced. And the seal structure is unreasonable;operating at high temperature high-pressure steam environment accelerated the seals falling. The falling seals struke the last stage blades of low-pressure rotor and resulted in the last stage blades damaged. The analysis result has directive significance for maintenance and retrofit to steam turbine.