皇冠即时比分

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电厂300MW机组循环水泵增流改造

水泵原理 卧泉泵业 882浏览 0评论

电厂4台300 MW国产引进型汽轮发电机组,配置了8台立式混流泵,泵原始设计参数:流量19 600 m3/h,扬程16.77 m,转速370 r/min,水泵效率87%。电机额定参数:功率1 250 kW,电流158 A,电压6 kV,频率50 z,转速370 r/min。由于电厂使用的汽轮发电机组中的凝汽器面积与国产同类型机组相比相对偏小,冷凝效果较差,导致机组真空不够,影响出力。另外,电厂使用的循环泵叶轮为组合式结构,强度低,在其叶片根部曾发生过裂纹和断裂现象,泵的实际出力达不到设计要求。这些问题严重影响机组安全经济运行,且循环水泵是该电厂厂用电的主要消耗源之一,约占整台机组厂用电量的20%,因此,对电厂的循环水泵进行增流改造,可提高排汽真空、运行效率和安全可靠性,具有十分重大的经济价值和社会效益。

1XUNHUANSHUIBENGGAIZAO

由于循环泵体积大、质量重、价格较贵,为增大流量而将叶轮壳体全部进行改造,势必造成很大浪费。而且将壳体和叶轮全部重新设计制造后,泵的安装尺寸、进出口法兰直径等也发生变化,给安装带来极大不便。因此实际改造时,采用了壳体不动,电机不换,仅改造叶轮的小改方案。具体要求如下:

a)GAIZAOHOUDEYELUNANZHUANGSHI,YUYUANYELUNWANQUANHUHUAN,QIEBENGDEQITALINGBUJIANBUBIANDONG;

皇冠即时比分b)GAIZAOHOUDEBENGYELUNXINGNENGCANSHUBIXUMANZUYUANXITONGHEYUANPEIDIANJIBUBIANDEQINGKUANGXIA,BENGLIULIANGYOUYUANSHEJI19.6×103m3/h,ZENGJIADAO 21×103~22×103 m3/h,BAOZHENGDIANJIBUCHAOGONGLV;

c)JIANGZUHESHIYELUNJIEGOUGAICHENGZHENGTIZHUZAOYELUNJIEGOU,TIGAOYEPIANQIANGDU。

1.1YELUNSHUILIJISHUGAIZAO

YINWEIGAIJINDEYAOQIUSHIBENGQIAOTIBUDONG,ZHIGAIJINYELUN,SUOYIYELUNDESHEJISHOUDAOYUANBENGQIAOTIJIHECHICUNJILIUTILIXUETEXINGXIANZHI,ERQIEGAIZAOHOULIULIANGDAFUDUZENGJIA,BIRANDAOZHIGEGUOLIUTONGDAONEILIUSUMINGXIANJIADA,SHUILISUNSHIYESUIZHIZENGDA。ZAICITIAOJIANXIA,YAOBAOZHENGSHUIBENGXIAOLVBUXIAJIANG,ZEBIXUCAIYONGXIANJINDESHEJIFANGFA,YOUHUAZHUANLUNDENGGUOLIUTONGDAO,YANJIUGEGUOLIUBUJIANDEPIPEIGUANXI,SHISHUILISUNSHIZUIXIAO,QUDEZUIJIAXINGNENG。

WEILEZENGQIANGBENGYEPIANQIANGDU,GAIZAOSHIJIANGYUANBENGDEZUHESHIYELUN,GAIZAOCHENGZHENGTIZHUZAOYELUN。JIEHESHIYANYUJINGYANQUEDINGXINYELUNYEPIANANFANGJIAOYOUYUANLAIDE0°GAIWEINISHIZHENJIADA3°。YEPIANSHEJIYIXIANGSIHUANSUANFAWEIJICHU,JINGGUOCHUBUHUANSUANDEDAOYELUNDEZHOUMIANCHICUNHOU,GENJUQIAOTIHEZHOUDECHICUNDUIYELUNJINKOUJINGBUZHIJINGHELUNGUZHIJINGJINXINGBIYAODEXIUZHENG。XIUZHENGSHIJIANGUTIGAOBENGDEKANGQISHIXINGNENG,JIADAYELUNDEJINKOUGUOLIUMIANJI。XIUZHENGHOUSHIFOUHELIHAIYAOJINXINGZHOUMIANYELIUGUOSHUIDUANMIANMIANJIBIANHUAGUILVJIANCHAHEFANGGEWANGLIUXIANJIANCHA。FAXIANBUHELIXIANXIANGZAIZHONGXINXIUZHENG,ZAIJIANCHA,ZHIDAOHELI。YELUNDESHEJIXUANYONGKEKAODEGAOXIAOSHUILIMOXING,MOXINGDEXINGNENGQUXIAN,MOXINGHUANSUANGONGSHIWEI:

皇冠即时比分SHIZHONG:λ——FANGDAXISHU,λ=4.1;

皇冠即时比分qV,p——SHIWUBENGDETIJILIULIANG,m3/h;

qV,m——MOXINGBENGDETIJILIULIANG,m3/h;

Hp——SHIWUBENGYANGCHENG,m;

Hm——MOXINGBENGYANGCHENG,m;

np——SHIWUBENGZHUANSU,370 r/min;

皇冠即时比分nm——MOXINGBENGZHUANSU,1 450 r/min;

皇冠即时比分ηp——SHIWUBENGXIAOLV,%;

ηm——MOXINGBENGXIAOLV,%。

1.2JIAGONGZHIZAOGONGYIYOUHUA

由于高比转速离心泵皇冠即时比分叶片为扭曲叶片,采用普通木模整体铸造叶轮会产生较大偏差,叶轮过流面也较粗糙。因此,在制造改造后的循环泵叶轮时,采用不变形的塑料模。叶片模具的型面采用组合样板严格检查,保证符合设计要求。造型采用先进的组合泥芯新工艺,型沙采用树脂砂,以提高铸件的几何形状精度和相对位置精度,降低表面粗糙度(Ra12.5~25)和减少原始不平衡。对不锈钢铸件进行固溶化处理,提高机械性能,减少偏析,提高抗蚀能力。叶片型面全部进行打磨抛光,粗糙度达到Ra3.2~6.3,提高效率。叶轮进行严格静平衡,叶片进行无损探伤。

 

2GAIZAOHOUSHIYANJIEGUOJIFENXI

2.1SHIYANJIEGUO

ANZHAOSHUIBENGSHIYANBIAOZHUN,DUIXUNHUANBENGMOXINGJINXINGLESHIYAN。SHIYANSHIXUNHUANSHUIGONGSHUIFANGSHICAIYONGDANYUANZHI,TONGGUODIAOZHENGBENGCHUKOUFAMENDIAOZHENGXUNHUANSHUILIANG。GONGCELIANGLE6GEBUTONGLIULIANGXIADEGONGKUANG。MOXINGBENGSHIYANSHUJUJIANBIAO3,QIZHONGBENGYANGCHENGHEBENGXIAOLVJISUANGONGSHIRUXIA:

SHIZHONG:p1,p2——BENGJIN、CHUKOUYALI,Pa;

ρ——XUNHUANSHUIMIDU,kg/m3;

皇冠即时比分g——ZHONGLIJIASUDU,9.81 m/s2;

v1,v2——BENGJIN、CHUKOUCHULIUSU,m/s;

皇冠即时比分ΔZ——BENGCHU、RUKOUYALIBIAOGAOCHENGCHA,m;

皇冠即时比分Pu——BENGDEYOUXIAOGONGLV,kW;

qVWEIBENGTIJILIULIANG,d1、d2WEIBENGJINCHUKOUYALIBIAOCHUZHIJING;Pu=ρgqVH/(3 600×1 000),WEIBENGDEYANGCHENG;Pa=Pd·ηd(LIANZHOUQICHUANDONGXIAOLVQU1),PdWEIDIANJISHURUGONGLV,ηdWEIDIANJIXIAOLV。

GENJUSHANGSHUMOXINGHUANSUANGONGSHI(1)、(2)、(3)DUIBIAO3ZHONGDESHUJUJINXINGHUANSUAN,DEDAOSHIWUBENGSHUJU。GENJUBENGSHEJIJINGYAN,DUISHUJUJINXINGXIUZHENG,DEDAODESHENGCHANCHANGJIATIGONGJIDIANCHANGDE+3°YELUNGAIJINSHEJICANSHU。DIANLISHIYANYANJIUSUO2001NIANDUIDIANCHANGGAIJINHOUDE2HAOXUNHUANBENGJINXINGSHIYAN,DEDAODEXUNHUANBENGSHICESHUJU。

2.2SHIYANFENXI

2HAOBENGGAIZAOHOU(+3°YELUN)DELIULIANG、YANGCHENGHEXIAOLVJIBENSHANGDADAOLESHEJIDEYAOQIU,BENGGAOXIAOYUNXINGFANWEIDAYUEZAI21×103~22×103 m3/hZHIJIAN,DADAOLEGAIZAOXIEYIZHONG“BENGXIAOLVBUDIYU80%”DEYAOQIU。TONGSHI,BENGGAOXIAOYUNXINGFANWEIYEBIANKUAN,XIANGZHEDALIULIANGFANGXIANGYIDONG,ZAIYANGCHENGXIANGTONGDEQINGKUANGXIA,GAIJINHOUDEBENGLIULIANGBIYUANSHEJIEDINGLIULIANG(19.6×103 m3/h)ZENGJIALE2 000~2 500 m3/h,YINCI,GAIJINHOUXUNHUANBENGKEZHANGQICHUYUGAOXIAOFANWEIYUNXING。SHIYANDEDAODEXUNHUANBENGXIAOLVBIYUANSHEJI87%YAODI,QIYUANYIN:YOUYUGAIZAOZHIQIANDUIYELUNSHIJINXINGLEQIEXUE,BENCIGAIZAOZHISHIDUIYELUNJINXINGGAIZAO,WEIDUIYELUNSHIJINXINGXIANGYINGGAIZAO,SHIDEYELUNYEPIANJINKOUDUANYIBUFENSHENZAIYELUNYUYELUNSHIPEIHEZHIWAI,DADAZENGJIALEYELUNSHIRONGJISUNSHI,CONGERJIANGDILESHUIBENGXIAOLV。CIWAI,YELUNSHIRUKOUZHIJINGYUANSHEJIWEI1.13 m,JINRUYELUNDESHUILIUSUDUWEI6.65 m/s,RUCIDALIUSUDESHUIZHUZHUANGJIBUZAIYELUNSHINEIDEYEPIANBIAN,FANZHUANGSHUILIUYUJINKOUSHUILIUGONGZHUANG,CHANSHENGWENLIUHEXUANWO,CONGERSHIYEPIANRUKOUSHUILIULIUTAIBIANHUAI,DAOZHISHUIBENGSHUILIXIAOLVJIANGDI,SHUIBENGZONGXIAOLVJIANGDI5%~6%。

GAIZAOHOUZAIBAOZHENGDIANJIBUCHAOGUOEDINGDIANLIUDETONGSHITIGAOXUNHUANBENGLIULIANG,BINGQIENENGSHIXUNHUANBENGYUNXINGZAIGAOXIAOLVQUNEI,SHIXIANDONGJIEDINGFUHEXIACAIYONGSANBENGLIANGJI,XIAJIEDINGFUHEXIACAIYONGSIBENGLIANGJIYUNXING。YIMEINIANYUNXING7 000 hJISUAN:GAIJINQIANYINXUNHUANSHUILIANGBUZU,WEIBAOZHENGZHENKONG,DONGJISIBENGLIANGJIYUNXING,GAIJINHOUZESANBENGLIANGJIYUNXING。SIBENGLIANGJIBISANBENGLIANGJIMEITAIJIZUMEIXIAOSHIDUOHAOCHANGYONGDIAN600 kWh,YINIANZHEHERENMINBI36WANYUAN。LINGWAI,XUNHUANSHUILIANGZENGJIA,GAISHANLENINGQIQIZHENKONG,TONGDENGMEIHAOQINGKUANGXIA,ZENGJIAJIZUJINGCHULI,TIGAOJIZUDEJINGJIXING。

3JIELUN

皇冠即时比分DIANCHANG2HAOXUNHUANBENGYELUNGAIZAO,CAIYONGZHENGTIZHUZAODEBUXIUGANGYELUN,GAIJINJIAGONGGONGYI,YOUHUAYELUNXINGXIAN,YEPIANANFANGJIAOCONGYUANSHEJIJIAODUNISHIZHENJIADA3°,BAOZHENGDIANJIBUCHAOGUOEDINGDIANLIUERTIGAOLEXUNHUANBENGLIULIANG,QIESHIXUNHUANBENGYUNXINGZAIGAOXIAOLVQUNEI。SHIYANYUSHIJIYUNXINGQINGKUANGBIAOMING,2HAOXUNHUANBENGYELUNGAIZAOSHIBIJIAOCHENGGONGDE,TABUJINJIEJUELESHIJIYUNXINGXUNHUANSHUILIANGPIANXIAOYINGXIANGLENGNINGQIZHENKONGDEZHUANGKUANG,ERQIEGAIJINHOUJIENENGXIAOGUOXIANZHU,BAOZHENGYELUNANQUANKEKAOYUNXING。QIGAIZAODECHENGGONGJINGYAN,BUJINWEIZHUJIANGDIANCHANGQITAXUNHUANBENGGAIZAOTIGONGLEYIJU,TONGSHIWEILEISIXUNHUANBENGGAIZAOTIGONGLECHENGGONGJINGYAN。

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