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余热发电系统发电机轴瓦拉伤事故的原因与措施
发布人:高速轴瓦,电机轴瓦 浏览次数: 发布日期:2015-8-1 9:32:28

 1  事故经过
上海11选5      某公司由于雷电导致全厂失电,2×5000t/d熟料线配套18MW发电机组跳停,润滑油压从0.10 MPa下降至0.04 MPa时,直流油泵未能连锁开启。当班操作员意欲通过中控画面启动直流油泵,发现直流油泵不备妥无法开机,他们立即联系现场人员,要求机旁启动直流油泵,也未成功。于是通过中控操作台启动紧急按钮开机,使直流油泵运转,润滑油压恢复正常,汽轮机1号、2号径向瓦温分别由106 ℃、115 ℃逐渐下降至正常。

     GONGDIANHUIFU,SHULIAOXIANYUNXINGZHENGCHANGHOU,JIZUKAISHICHONGZHUAN,DANGZHUANSUZAI0~1 200 r/minSHIJIZUZHENDONGHEZHOUWAWENDUZHENGCHANG,DANGZHUANSUCONG1 200 r/minSHENGSUDAO2 500 r/minSHI,JIZUZHENDONGZHUJIANSHENGGAO,QIZHONG2HAO、3HAOZHOUWAZHENDONGFENBIESHENGZHI69.46 μmHE51.01 μm,1HAO、2HAOZHOUWAWENDUFENBIESHENGZHI57.6 ℃HE64.6 ℃。XIANCHANGRENYUANDAZHATINGJI,JIANCHAFAXIAN1HAO、2HAO、3HAOZHOUWAJUNYOUBUTONGCHENGDULASHANGXIANXIANG(TU1),XUJINXINGGENGHUAN。

2  原因分析
     余热发电DCS机柜电源情况见图2。图2中,每面机柜由两路AC220V电源供电,互为冗余。第一路为UPS电源,第二路为市电,DI信号COM电源由DCS机柜48 V电源模块提供,每一块24 V电源模块和48 V电源模块均有一路输出引至电源报警用继电器。

上海11选5      BAOJINGXINHAOTONGGUODUANZIYINZHIDCSDEDIDIAN,BINGZAICAOZUOHUAMIANSHANGYOUTISHIXINXI,DANGRENHEYIGEDIANYUANMOKUAISHUCHUYICHANGSHI,CAOZUOHUAMIANSHANGDE“XITONGPEIZHI”ANNIUSHANGDEZIHUIBIANCHENGHONGSE,JIANTU4KUANGTUBUFEN。TU4HETU5ZHONG,MEIMIANJIJUYOULIANGLUAC220VDIANYUANGONGDIAN,HUWEIRONGYU。DIYILUWEIUPSDIANYUAN,DIERLUWEISHIDIAN。DIXINHAOCOMDIANYUANYOUDCSJIJU48VDIANYUANMOKUAITIGONG。

     TONGGUOLUKONGZHIJULEISI,MEIYIKUAI24 VDIANYUANMOKUAIYILUSHUCHUYINZHIDIANYUANBAOJINGYONGJIDIANQI,BENKONGZHIJUDE48 VDIANYUANHELAIZILINGYIMIANKONGZHIJUDE48 VDIANYUANGEYILUSHUCHUYINZHIDIANYUANBAOJINGYONGJIDIANQI,BAOJINGTONGGUODUANZIFENBIEYINZHIT11HET12JIJUDEDIXINHAO,BINGZAICAOZUOHUAMIANSHANGYOUTISHIXINXI,DANGRENHEYIGEDIANYUANSHUCHUYICHANGSHI,CAOZUOHUAMIAN“XITONGPEIZHI”ANNIUSHANGDEZIHUIBIANCHENGHONGSE。

上海11选5      48 VDIANYUANMOKUAIDESHIYONGTONGGUOLUKONGZHIJUYOUXIEQUBIE:LIANGMIANQILUNJIKONGZHIJU(T11HET12)DIXINHAODECOMDIANYUAN,YOULIANGKUAIFENBIEFANGZHIZAIT11HET12JIJUDE48 VDIANYUANMOKUAITIGONG,TONGGUOT11HET12KONGZHIJUBEIMIANDEDYZJDUANZIDEKUAJIESHIXIANRONGYU,JIANTU8。

     YOUYISHANGFENXIKEZHI,ZAOCHENGBENQIFADIANJIZHOUWALASHANGSHIGUDEZHUYAOYUANYINSHI:QUANCHANGSHIDIANHOU,ZHILIUYOUBENGBUBEITUO,ZHONGKONGBUNENGLIANSUOZIDONGQIDONG,DAOZHIQILUNJIZHOUWASHUNJIANQUEYOULASHANG。JINGJIANCHADCSKONGZHIJUT11HET12JUZHIJIANDELIANGLUDC48VDIANYUAN(YILUWEISHIDIAN,YILUWEIUPSDIANYUAN)WEITONGGUODUANJIEXIANLIANJIE,BUNENGQIDAOHUWEIBEIYONGDEZUOYONG,DANGQUANCHANGSHIDIANHOU,DCSKONGZHIJUNEIDEXITONGCOMDIANYUANDC48VDIANYUANSHIDIAN,ZHILIUYOUBENGBUBEITUO,ZHONGKONGHUAMIANWUFAQIDONGDAOZHIBENCISHIGU;TONGSHI,DANGBANCAOZUOYUANZAIFAXIANZHILIUYOUBENGWEIZIDONGQIDONGHOU,MEIYOULIJITONGGUOCAOZUOTAIYINGJIANNIUQIDONGERSHILIANXIXIANCHANGKAIJI,YANWULEZHILIUYOUBENGKAIJIDEZUIJIASHIJIAN,ZHOUWASHUNJIANQUEYOULASHANGZAOCHENGSHIGUKUODA。

3  防范措施
     (1)加强现场设备安装管理,对新机组安装接线时,要督促安装单位严格按图纸施工,调试人员应根据设计要求进行确认,查看设备的连锁、保护等是否正常,确认无误后才能允许机组开机运行。
     (2)认真吸取事故教训,按照设计要求定期组织对设备的保护或连锁进行检查、确认,对于类似电源互倒、互为备用设备在恰当的时间进行模拟试验。
     (3)加强中控操作人员的技能培训,掌握应急失电操作,在全厂失电后操作员可立即通过操作台紧急按钮启动直流油泵,在主机设备出现故障或自身专业技能无法预料后果的情况下,尽快作停机处理,以免事故扩大。
     (4)在故障停机或设备出现异常情况下,未查明原因严禁再次开机,防止故障或事故扩大化。
 

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