300MW汽轮机轴封加热水位波动原因分析及解决措施  

Cause Analysis and Solving Measures of Shaft Seal Heating Water Level Fluctuation of 300MW Steam Turbine

作　　者：黄坤昌 范双双 李丰均 居国腾 刘东旭[2,3] HUANG Kunchang;FAN Shuangshuang;LI Fengjun;JU Guoteng;LIU Dongxu(Shaoxing Binhai Thermal Power Co.,Ltd.,Zhejiang Zheneng Electric Power Co.,Ltd.,Shaoxing,Zhejiang Province,312073 China;Harbin Institute of Technology,Harbin,Heilongjiang Province,150001 China;Harbin Wohua Intelligent Power Equipment Co.,Ltd.,Harbin,Heilongjiang Province,150001 China)

机构地区：[1]浙江浙能绍兴滨海热电有限责任公司,浙江绍兴312073 [2]哈尔滨工业大学,黑龙江哈尔滨150001 [3]哈尔滨沃华智能发电设备有限公司,黑龙江哈尔滨150001

出　　处：《科技创新导报》2021年第19期48-50,54,共4页Science and Technology Innovation Herald

基　　金：浙江省能源集团有限公司科技项目(No.ZNKJ-2019-006)。

摘　　要：轴封系统是汽轮机的重要子系统,直接影响机组的安全性和经济性。某电厂300MW机组在完成切缸改造工作后,汽轮机轴封加热器水位产生了持续波动且逐渐恶化,导致轴封加热器频繁推出运行状态。通过制订不同的试验方案逐步排除了各部位的漏汽问题或切缸引发的副作用,并发现了疏水超过管道承载能力是造成水位波动的主要原因。通过改造疏水管路以增加轴加疏水的溢流能力有效解决了该故障。改造方案对同类型机组的类似问题有一定的借鉴意义。The shaft seal system is an important subsystem of the steam turbine,which directly affects the safety and economy of the unit.After a 300MW unit completed the modification of removing low-pressure cylinder,the water-level of the shaft seal heater fluctuated continuously and gradually deteriorated,which caused the gland heater to be frequently put out of operation.Through the development of different test programs,the steam leakage problem at various parts or the side effects caused by removing low-pressure cylinder were gradually eliminated,and it was found that the drainage exceeding the carrying capacity of the pipeline was the main reason for the fluctuation of the water level.The fault was effectively solved by modifying the drain pipeline to increase the overflow capacity of the gland heater drain.The transformation plan has certain reference significance for similar problems of the same type of units.

关 键 词：300MW汽轮机组 轴封系统 轴封加热器 水位波动 低压缸切除 

分 类 号：TM621[电气工程—电力系统及自动化]