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您的位置:中浦德机械流体设备 > 常见问题 > 循环泵汽蚀原因与改造

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循环泵汽蚀原因与改造
时间 : 2018-08-05 17:00 浏览量 : 31

1) 故障现象

运行不到两个月,叶轮叶片被汽蚀破坏

BENGCHUYUQUANKAIFAZHUANGTAIXIAYUNXING

BENGCHUKOUYALI0.7-0.8kgf/cm2,ZHIZHENPINFANHUANGDONG,YOUMINGXIANBAOPOSHENG

NINGQIQIJINCHUXUNHUANLENGQUESHUIDEWENCHADA25℃,ZHENGCHANGWENCHAYINGWEI8~11℃


BENGMINGPAICANSHU:

YANGCHENG 32 m 

LIULIANG 3240 m3/h 

QISHIYULIANG 7.4 m 

ZHUANSU 960 r/min 

EDINGGONGLV 380 kw


2) 现象分析

循环冷却水温差达25℃,正常温差应为8~11℃,说明循环冷却水的流量不足

YOUMINGXIANBAOPOSHENG,SHUOMINGBENGQISHIXIANXIANGYANZHONG

BENGCHUKOUYALIBUDAOYIGONGJIN(1kg/cm2),ERYANGCHENGSHI32MI,XIANRANSHIYOUYUBENGXUANXINGYANGCHENGGUOGAO,SHIBENGPIANYUDIYANGCHENG、DALIULIANG、QISHIXINGNENGCHADEGONGKUANGXIAYUNXING,CONGERYANZHONGQISHIDAOZHIYEPIANSUNHUAI。


3) 现场试验

将阀门从全开状态逐步关小,毎隔15分钟关小一次,读一次数。

DAODISICIGUANXIAOHOU,BENGCHUKOUYALICAISHENGZHI1.85 kgf/cm2。

JIXUWANGXIASHI,ZHIZHIBENGCHUKOUYALIDADAO3.2 kgf/cm2YIHOU,NINGJIEQILENGQUESHUIQIANHOUWENCHACONG25℃XIAJIANGDAO11℃ZUOYOU(JIANFUBIAO),ZHEISHUOMINGXUNHUANLENGQUESHUILIANGZENGJIALE。TONGSHIBENGDEQISHIXIANGSHENGYEXIAOSHILE,CHUKOUYALIZHIZHENYEWENDINGLE。CISHICHUKOUFAMENKAIDUDAYUEZHIYOU10%ZUOYOU,FAMENYOUXIEZHENDONG。


4) 改造方案

TONGGUODUIXIANXIANGDEFENXIHEXIANCHANGSHIYAN,BINGSHENRUDIAOCHALEJIESUOYOUZILIAO,KUAI3CAIPIAOappXIANGYONGHUDEYOUGUANLINGDAOHEJISHURENYUANTICHUFENXIYIJIAN,BINGTICHULEGAIZAOFANGAN。

1.


(1)凝汽量为110m3/h,要求循环水量为3850~6050m3/h,单泵流量为3025~3850m3/h。

(2)BENGJINSHUIGUANLUGUANJINGWEIDg1000,ZHANGDUL2=25m,YIGEDIFA,4GE900WANTOU。

(3)NINGQIQINEIZULIJIANG△H=5m,GENJUSHANGSHUSHUJUTUISUANBENGZHUANGZHITEXINGQUXIANFANGCHENGWEI:

(4)HZ=KQ2=6.67Q2Q:m3/s)  


CONGZHUANGZHISHIYITUKEZHI,BENGJINCHUSHUIWEICHAJIJIHEYANGCHENGJIBENWEILING。

2.


双泵运行时的A点工况为:

ΣQ=1.68m3/s=6050m3/h

Q=0.84m3/s=3025m3/h

H=18m


DANBENGYUNXINGSHIDEADIANGONGKUANGWEI:

Q=1.07m3/s=3852m3/h

H=7.5m


YOUCIKEZHI,XUANYONG24SA-18XINGBENG(Q=3240m3/h、H=32m)DEYANGCHENGPIANGAOTAIDUO。


YOUYUXIANYOUBENGDEYANGCHENGPIANGAOTAIDUO,NANYITONGGUOQIEGEYELUNDADAOYAOQIU,BIXUSHEJIXINDEYELUN。TONGSHIYOUYUYANGCHENGDI,YOUYAOBAOCHIBENGDELIULIANG,WEILEBAOZHENGLIXINBENGBIZHUANSUDEYAOQIU,YOUBIXUJIANGZHUANSUYOU960r/minJIANGZHI740r/min。


YINCIXINYELUNCANSHUDINGWEI:

Q:3240m3/h         H:16m

      n:740r/min    ns:226

XINYELUNDEBENGXINGHAODINGWEI24SA—18D


5)改造方案及改造后运行工况分析 


3.


DANBENGYUNXINGGONGKUANGWEICDIAN:

        Q:4104m3/h

        HC:8.5m

         η:60%(CHABENGXINGNENGQUXIANDE)

LENGQUEBEILVm=4104/110=37BEI,MANZUYAOQIU


SHUANGBENGYUNXINGGONGKUANGWEIDDIAN:

      ΣQ:6012m3/h

  DANBENGQ:0.833m3/s

       HD:18m

       η:87%(CHABENGXINGNENGQUXIANDE)

LENGQUEBEILVm=6012/110=55BEI,MANZUYAOQIU。


6)改造效果

泵不再出现汽蚀现象,叶轮使用寿命达两年以上,大大降低检修工作量和维修费用;水量满足发电要示,凝结器真空度(700mmHg)和进出水温(△T=10℃左右),均达到标准值,提高了发电机组的出力; 粗略分析比较,一年节省的费用(包括电费和备件费)约10万元,其中节省的电费单价按每度厂用电0.065元计算。虽然节省的费用绝对数值并不太高,但是相对于一台24寸的泵而言,十万元已是相当可观了。




标签: 循环泵汽蚀原因与改造

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