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专题资讯

火电厂烟气脱硫系统用泵机械密封常见故障分析及对策

发布日期:2014-02-17

  火电厂湿法烟气脱硫工艺是采用石灰石或石灰作为吸收剂,与锅炉尾部烟气在喷淋塔内接触反应,使石灰浆液中的钙同烟气中的SO2反应生成石膏,同时去除烟气中的其它污染物。烟气脱硫系统中使用的泵轴封全部为机械密封,且大部分是无冲洗水机械密封。此类机械密封能否可靠运行直接关系到泵的运转,是泵至关重要的零部件。

  一. 烟气脱硫装置介质特点

  锅炉排放的烟气温度较高(180℃),相对湿度3%,含煤和各种腐蚀性成分,如SO2、NO2、HCl及盐雾,浆液中含有20000~60000ppm的Cl-大富豪棋牌游戏,浆液的pH值大约在4~9之间,浆液中含有石灰石、石膏的浓度为20~35%,含固体量有时高达60%。固体最大粒径为1mm,温度最高可达70℃。

  二. 烟气脱硫装置用泵及机械密封现状

  脱硫系统用泵按其性能特点大致分为三类:一类是大型循环浆液泵,流量4000~9800m3/h,扬程18~27m;一类是石灰制浆系统及石膏排出用小型泵,流量15~100m3/h,扬程25~70m;其它为辅助系统用工艺水泵,流量100~300m3/h,扬程30~65m。前两类为脱硫系统的核心设备,尤其是大型循环浆液泵每台机组装置配备3~4台,价格昂贵,无备用泵,可靠性要求较高。这些泵的机械密封原来一直采用进口的机械密封,价格昂贵,备件供货时间较长,而国内生产厂家提供的机械密封普遍会发生不同程度的泄漏。

  三. 脱硫泵机械密封失效分析

  TUOLIUXITONGBENGCAIYONGDEJIXIEMIFENGTONGCHANGWEIWEIDANHUANGTUIJINSHI,YIKAODONGHUANYUZHOU、JINGHUANYUBENGQIAO(YAGAI)ZHIJIANDEJINGMIFENGYIJIDONG、JINGHUANZHIJIANXIANGDUIXUANZHUANHUADONGMOCADEDUANMIANZHIJIANDEJIECHULAISHIXIANMIFENG。LIANGDUANMIANZHIJIANDEXIELOUSHIMIFENGSHIXIAODEZHUYIN。

  JIXIEMIFENGDESHIXIAOZHUYAOBUSHIYOUYUSHEJIYUANLISHANGDESHIWU,ERSHIYOUYUDONGJINGHUANLIANGGEDUANMIANJIANDEMOCASUNHUAI,DUANMIANDESUNHUAIBAOKUONIANFUMOSUN、MOLIAOMOSUN、MOSHI、BIAOMIANMOSUN、CHONGSHUAMOSUN。ZHEIXIEXIANXIANGZAITUOLIUXITONGDEJIXIEMIFENGZHONGJUNYOUTIXIAN。

  石灰石浆液工况。由于脱硫工艺的需要,石灰石浆液的密度为1230kg/m3(固含量30%),由于石灰石粉密度小,具有黏附性和荷电性,导致石灰石粉粒流通不畅(比如结块、搭桥等)。在该工况下需要硫化风机向石灰石仓内鼓入一定压力的气体(气体压力一般为0.2~0.5MPa)搅拌石灰石粉,使石灰石粉呈流态化。

大富豪棋牌游戏   SHIGAOJIANGYEGONGKUANG。XISHOUTACHIYECAONEISHIFANYINGHOUDESHIGAOJIANGYE,WEILEBIANYUSHIGAODEXINGCHENG(CONGYALIUSUANGAIJINYIBUYANGHUACHENGLIUSUANGAI),TONGGUOYANGHUAKONGQIFENGJIXIANGCAONEIGURUZUGOUDEYANGQI(YINWEIYANQIZHONGSUOHANDEYANGQIBUZUYIMANZUYANGHUAXUYAO),ZHEIYANGDAOZHIJIANGYEZHONGHANYOUDALIANGDEQIPAO。

大富豪棋牌游戏   SHIGAO、SHIHUISHIZHEILIANGZHONGJIANGYEZHONGHANYOUDALIANGKONGQI,MIFENGQIANGNEIJIXIEMIFENGDEGONGZUOMIANFUJINJIANGYEYALIDI,CONGERSHIQIPAOTIJIPENGZHANG,SHIMIFENGDUANMIANDEBUDAOHENHAODELENGQUE、RUNHUA,SHENZHIZAOCHENGMIFENGDUANMIANJIANRUNHUAMOQIHUAXINGCHENGGANMOCA,SUNHUAILEMIFENGMIANDEGUANGJIEDU、PINGZHIDU,CONGERZAOCHENGXIELOU。YIDANHANKELIDEJIANGLIAOCONGMIFENGDUANMIANJIANTONGGUOJIUHUICHUXIANYANZHONGDEMOLIAOMOSUN,FANGUOLAIYOUGENGJIASUNHAIDUANMIANZHUANGKUANGCONGERXINGCHENGEXINGXUNHUANYIZHIWANQUANSHIXIAO。YOUSHIGANMOCACHANSHENGDEGAOWENSHIOXINGQUANTANHUA,SHISiCHUANRELIESUNHUAICHUXIANGUILIEWEN。

  YOUYUZHONGZHONGYUANYIN,LIRUWEILEJIEYUETOUZIHEYUNXINGCHENGBENERSHENGQUCHONGXISHUIXITONG、JIANKONGSHEBEI、JIEYUESHUIZIYUANDENGYUANYINERYAOQIUDE“WUSHUIMIFENG”,JUEBUSHIZHIMIFENGDUANMIANJIANKEYIGANMOCA,ERSHIZHIYIKAOJIEZHIBENSHENLAILENGQUE、RUNHUADUANMIAN,SHIJIEZHIZHONGDEYETICHENGFENZAIDUANMIANJIANXINGCHENGYICENGJIBUTONGYUZHOUCHENGDEWANQUANYETIRUNHUA,YEBUSHIGANMOCADESUOWEI“BIANJIERUNHUA”ZHUANGTAI。YINCICHONGFENDIRANGDUANMIANJIANMOCAMIANJIECHUYETIJIEZHISHIFENZHONGYAO。

  四. 采取的措施

  ZHENDUIYISHANGELIEDEGONGKUANG,FENBIEZHENDUIJIXIEMIFENGSHEJI、BENGSHEJIHEBENGXIANCHANGYUNXINGCAIQUCUOSHI。

  4.1 JIXIEMIFENGSHEJISHANGCAIQUDECUOSHI

大富豪棋牌游戏   4.1.1 JIXIEMIFENGMOCAFUXUANCAI

  GENJUTONGJI,JIXIEMIFENGDEXIELOUDAYUEYOU80~95%SHIYOUYUMIFENGDUANMIANMOCAFUZAOCHENGDE,CHULEYAOBAOCHIMIFENGMIANPINGXINGZHIWAI,GUANJIANZAIYUMOCAFUDECAILIAOXUANQU。

大富豪棋牌游戏   MOCAFUCAILIAOYONGYUTUOLIUGONGKUANGBIXUYAOJUBEIZUGOUDEQIANGDU、YINGDU、NAIMOXING、NAISHIXING、NAIWENXING、NAICHONGJIXINGHEPILAOQIANGDUDENG,QIEJUYOULIANGHAODENAIGANMOXING、ZIRUNHUAXING。QIZHONG,NAIMOXING、NAISHIXINGHEKANGRELIEXINGNENGSHIZUIZHUYAODEYAOQIU,ZONGHEHENGLIANGMOCAFUGEZHONGCAILIAOHOU,XUANZELETANHUAGUI(SiC)CAILIAO。

  4.1.2 JIXIEMIFENGDEJIEGOU

  JIXIEMIFENGJIEGOUCAIYONGDANDUANMIAN、PINGHENGXING、WAIZHUANGSHI,KAOLVYUNXINGGUOCHENGZHONGJIANGYEBUWENDING,WEIFANGZHICHONGJIMOCAFU,DONGJINGHUANCAIYONGZHENGTISHITANHUAGUI,BUCAIYONGXIANGQIANSHITANHUAGUI。

大富豪棋牌游戏   GENJUGONGKUANGDEXINGZHI,DUIYUYIJIEJING、YININGGUHEGAOZHANDUDEJIEZHI,WOMENXUANZEDADANHUANGJINGZHISHIJIEGOU,BUXUANZEXIAODANHUANGJIEGOU。YINWEIXIAODANHUANGRONGYIBEIGUTIWUDUSAI,GAOZHANDUJIEZHIHUISHIXIAODANHUANGDANLISHOUSUN。DADANHUANGJIEGOUYOUYUANLAILUOLUZAIWAIGAIWEIYONGJIATAOBAOZHU,FANGZHIWAIMIANDEWUWUJINRUCONGERYINGXIANGDANHUANGDEBUCHANGNENGLI,BINGZHENGQUEXUANZEDANHUANGDEGANGDUHESHUMU,BAOCHIJINGHUANDEZHUISUIXING。

  JISUANHELIDEDANHUANGBIYA,BAOZHENGJIXIEMIFENGZAITOURUYUNXINGHOUJINENGSHUNLIDAKAIDONGJINGHUANJIECHUMIAN,NENGGOUZAIDONGJINGHUANZHIJIANYOUWEIXIAODEJIANXI,XINGCHENGYICENGSHUIMO,BUZHIYUSHIMOCAFUZHIJIEJIECHUERCHANSHENGGANMO。

  4.2 TUOLIUBENGSHEJISHANGCAIQUDECUOSHI

  4.2.1 YELUNSHEJI

  ZHENDUISHIHUISHIJIANGYEHESHIGAOJIANGYEZHONGCUNZAIDEQIPAO,CAIQUZAIBENGDEYELUNSHANGZUANPAIQIKONGDEFANGFA,SHIDEBENGZAIYUNXINGGUOCHENGZHONGJIANGYECONGGAOYAQUXIANGDIYAQUXUNHUAN,BIMIANJIANGYEZHONGDEQIPAOZAIDONGJINGHUANZHOUWEIJUJI,XINGCHENGGANMOCA。

  4.2.2 JIANXISHEJI

大富豪棋牌游戏   WEILESHIJIANGYEKUAISUDIDALIANGJINRUJIXIEMIFENGQIANGTI,SHILENGQUEMIFENGFUDADAOLIXIANGDEXIAOGUO,ZAIYELUNHEHOUHUBANZHIJIANJIADAJIANXI,YIBANZHANGWOZAI3~8mm。

  4.2.3 MIFENGQIANGTISHEJI

  MOCAFUYUNZHUANHOUHUICHANSHENGDALIANGDERE,WEIBAOZHENGYOUZUGOUDEJIANGYEJINXINGLENGQUEXUNHUANYIDAIZOUMOCAFUMOCACHANSHENGDERELIANG,KEYIJIANGJIXIEMIFENGDEQIANGTIJIADA。

大富豪棋牌游戏   4. 3 BENGQITINGQIANHOUCAIQUDECUOSHI

  XIANCHANGYUNXINGGUOCHENGZHONG,YIJUJINGYAN,RENWEIZAIQIDONGBENGQIANSHOUXIANJIANGJINKOUFAMENDAKAI5min,SHIJIANGYECHONGFENJINRUBENGHEJIXIEMIFENGDEQIANGTIZHIHOUCAIKEKAIQIBENG,YIFANGZHIJIANGYEWEINENGDAODAMOCAFUZHOUWEIJIUKAIQIBENGERZAOCHENGGANMOCA。

  TINGBENGHOUXIANCHANGJISHIKAIQIFANCHONGXISHUI,YIBANBUXIAOYU0.8MPa,FANCHONGSHIJIANBUSHAOYU5min,YIJIANGNIANFUZAIMOCAFUZHOUWEIDEJIANGYEKELICHONGXIGANJING,QUEBAOXIACIQIDONGBENGQIANWUGUTIKELIGANBAZAIMOCAFUSHANG,BINGFANGZHIJIANGLIAOZAIOXINGXIANGJIAOQUANDEJIANXINEIZHILIU、BANJIE。

  五. 选择自平衡机械密封

  ZIPINGHENGJIXIEMIFENGSHIZHOUSIBENGYEDEZHUANLIJISHU,MIFENGJIEGOUJIANYOUTU。

  该密封使用橡胶鼓形圈取代了以往的金属弹簧,整个密封结构都不存在金属件,无被液体腐蚀之忧。了解该密封及产品详细资料,请查看UHB-Z系列脱硫循环泵

相关阅读:
浓硫酸泵的选型案例分析
稀硫酸泵的结构特点及产品介绍
稀硫酸泵的选型要求
常用非金属塑料泵介绍