350MW超临界机组高压调节阀阀位不跟踪故障分析及改进方法  

Failure Analysis and Improvement Methods of High Pressure Control Valve Position Non-Tracking of DFSTW 350 MW Supercritical Steam Turbine

作　　者：李玉辉 赵树春 王忠权 和占林 LI Yuhui;ZHAO Shuchun;WANG Zhongquan;HE Zhanlin(Huaneng Luoyang power generation Co.Ltd.,Luoyang,Henan 471000,China)

机构地区：[1]华能洛阳热电有限责任公司

出　　处：《东北电力技术》2019年第10期36-39,42,共5页Northeast Electric Power Technology

摘　　要：介绍了350MW超临界汽轮机高压调节阀经长时间运行后出现高调阀自发性开大且不能关回的阀位不跟踪指令故障情况,对照其他技术类型高调阀结构,从阀门结构特点和故障产生机理上深入剖析了故障原因,指出故障的根源为东汽—日立型高调阀在结构设计上未考虑阀碟上下部蒸汽压力的应急平衡问题,阀碟与阀套之间由氧化皮堆积导致的阀碟卡涩是故障诱因,通过阀套钻平衡孔的阀芯结构改进,有效抑制了该故障的发生,为类似高调阀故障的诊断、处理提供了参考。It introduced a fault condition of position non-tracking that occurred after operating for a long time of high pressure control valves of 350 MW super-critical steam turbine.The cause of the fault is deeply analyzed from the structural characteristics of the control valve and the mechanism of the fault by comparing control valve structures with other technical type. The root cause of the fault was pointed out that Hitachi s new control valve did not take into account the emergency balance of the up and down pressure of the valve disc in the structural design. The cause of the fault is the valve disc jam caused by the oxide scale deposit between the valve disc and the valve sleeve. The occurrence of the fault is effectively improved by the valve core structure through the valve sleeve drilling balance hole, which provides reference for the diagnosis and processing of similar control valve faults.

关 键 词：汽轮机 高压调节阀 不跟踪 弹簧 阀碟 

分 类 号：TK269[动力工程及工程热物理—动力机械及工程]