APP下载

某电厂汽轮机发电机氢气纯度低原因分析及处理

2021-07-15陈浩李隆锋倪仲俊

科技资讯 2021年9期

陈浩 李隆锋 倪仲俊

摘  要:某电厂660 MW汽轮发电机组自机组投产以来一直存在发电机氢气纯度偏低的情况,不仅影响发电机的效率,还不利于机组的安全运行。该机组系氢冷发电机,配有密封油系统,密封瓦为双流环配置。该文对造成发电机氢气纯度低的原因进行了分析与排查,剖析了密封油系统对氢气纯度的影响。根据分析结果,结合机组检修对相关設备进行了处理、调整、优化,最终取得了较好的效果,同时也为其他同类型电厂提供了经验借鉴。

关键词:氢冷发电机  氢气纯度  双流环密封油系统  密封瓦  分析处理

中图分类号:TM311                        文献标识码:A文章编号:1672-3791(2021)03(c)-0042-04

Cause Analysis and Treatment of Low Hydrogen Purity of Steam Turbine Generator in a Power Plant

CHEN Hao  LI Longfeng  NI Zhongjun

(Zhejiang Energy Yueqing Power Generation Co., Ltd., Wenzhou, Zhejiang Province, 320609  China)

Abstract: Since the 660 MW steam turbine generator unit of a power plant was put into operation, the hydrogen purity of the generator has been low, which not only affects the efficiency of the generator, but also is not conducive to the safe operation of the unit. The unit is a hydrogen cooled generator, equipped with a sealing oil system, and the sealing pad is of double flow ring configuration. This paper analyzes and investigates the causes of low hydrogen purity of generator, and analyzes the influence of sealing oil system on hydrogen purity. According to the analysis results, combined with the unit maintenance, the relevant equipment was treated, adjusted and optimized, and finally achieved good results. At the same time, it also provides experience for other similar power plants.

Key Words: Hydrogen-cooled generator; Hydrogen purity; Dual-flow ring sealing oil system; Sealing tile; Analysis and processing

某发电公司#1机组660 MW超临界燃煤发电机组,自机组投产以来一直存在发电机氢气纯度偏低的情况。由于氢气具有易燃、易爆的特性,如果氢气中含氧量大于3%,极有可能发生爆炸;氢气纯度下降,还会造成发电机绕组绝缘降低,不利于发电机的安全运行;同时,发电机氢气纯度过低,将影响其冷却效果[1],影响发电机发电效率[2]。因此,一般要求发电机运行时内部氢气纯度要大于96%[3]。该文主要阐述了汽轮发电机组氢气纯度偏低的原因,及其相关的处理措施。

1  设备概况

某发电公司#1机组600 MW超临界燃煤发电机组于2008年9月投产发电,汽轮机系上海汽轮机有限公司引进美国西屋技术设计制造,是超临界、一次中间再热、单轴、三缸四排汽、反动凝汽式汽轮机,型号为N600-24.2/566/566,机组铭牌功率为600 MW。发电系发电机是上海汽轮发电机有限公司引进西门子技术制造的QFSN-600-2型发电机,为汽轮机直接拖动的隐极式、二极、三相同步发电机,采用水氢氢冷却方式,密封油系统采用双流环形式。……

登录APP查看全文