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关于输水管道排气阀的增设

作者:气囊 来源:ichaferry.com 发表时间:2010-8-27 8:46:16 浏览:次  
    据一些爆管的经验,气囊高度达到管径四分之一是爆管的危险点,也就是气囊的临界点。黑龙江鹤岗的一段管道爆管就是一个典型的例子.本文就如何在输水管道上设置排气阀,避免气体聚集成气囊进行探讨。当d·Sinα>C时,气泡向上移动。输水管道常见的事故是爆管,引起爆管的原因主要有:温度应力、管材质量、施工质量、地质构造和水锤等。

  YI、FULIFENLIP1=PSinα(1)  SHIZHONG:p--QIPAOSHOUSHUIDEFULI(P=1/6πd3·P)  P--SHUIDERONGZHONG  d--QIPAOZHIJING  α--GUANDAODEFUJIAO  QIPAOSHOUSHUILIUDETUILIWEIP`  V2  p'=-----.S(2)  2g10   V2  SHIZHONG:--------LIUSUYAQIANG(Kg/cm2)2g10  S--QIPAOZUIDAJIEMIANJI(S=1/4πd2)  V--SHUILIUSU(m/s)  DANGP1=P`SHI,QIPAOSHOULIDADAOPINGHENGERJINGZHIZAIGUANDAOZHONG。   2.GUANDAOZHONGQINANGDEXINGTAIQIANSHUQIPAOPINGHENGWENTISHI,JIASANCENGKUANGYONGZHENDONGSHAIDINGLEQIPAOWEIZHIJINGDENGYUdDEQIUXING,ZHEIZHINENGJINSIDIXINGRONGWEIXIAOQIPAO,SHIJISHANGDANGQIPAODADAOYIDINGTIJI,QIESHANGSHENGDAOGUANBICHENGWEIQINANG,YOUYUBIAOMIANZHANGLIDEDEZUOYONG,TAJIANGYIBANTUOYUANXINGZHUANGCUNZAI。LIANLI(1)、(2)SHIDE3d.Sinα=-----------10.4p.gC--PINGHENGCHANGSHUSHI(3)SHUOMING,ZAIHENGDINGLIUTIAOJIANXIA,QIPAOZHIJINGYUGUANDAOFUJIAODEZHENGXIANCHENGFANBI。  

  ER、SHILIJIFENXIZAIDIXINGQIGUDIDUAN,YAOQIUSHUSHUIGUANDAODEZUIGAODIANSHEPAIQIFA,DANSHIJIYUNXINGZHONG,XUDUOBAOGUANBINGWEIFASHENGZAIGAODIANHUODIDIAN,ERSHIFASHENGZAIGAODIANHOUDEXIAWANGUANDUAN,SHENZHIDIYAGUANDAOYEFASHENGCILEIBAOGUAN。GUANDAOZHONGDEQINANGSUIRANBUNENGZHIJIEZAOCHENGSHUICHUI,DANKEJIEZHUSHUICHUIZAOCHENGWEIHAI。

  YUEGUOPAIQIFADEQIPAOSHUNPOERXING,YUNDONGFANGXIANGYUQIPAOSUOSHOUFULIDEFENLIP1FANGXIANGXIANGFAN,ZHEIGEFULIHELICHANSHENGDEZULI,BIRANSHIQIPAOYUNDONGDESUDUJIANMAN,HOUXUQIPAORONGYIZHUANGJIQIANMIANQIPAOERQUANCHENGDAQIPAO,DAQIPAOCHANSHENGDADEFULI。XIAOQIPAOYANGUANBIYIDINGKUANDUXIANGQIANLIUDONG,JINGGUOZUIGAODIANPAIQIFASHI,PAIQIGUANZHIJINGNEIDEQIPAOYOUTIAOJIANPAICHU,ERQITAQIPAOKAOSHUILIUDETUILIXIANGXIAYOULIUQU。YOUYUSHUSHUIGUANDAOFUDANQUANXITONGGONGSHUI,QIEYALIJIAOGAO,SUOYITADEANQUANYUNXINGWENTISHIZHONGBEICONGSHUIBUMENHESHEJIBUMENSUOZHONGSHI。

  SAN、JIELUN  1.SHUSHUIGUANDAOXIAPODUANBIXUZENGSHEPAIQIFA,GUANXINGZHENDONGSHUSONGJI(GZSXING)JUTIWEIZHIYOUSHIP`=PSinαQUEDING,JISUANLIUSUQUPINGJUNZHIWEIYI;  2.GUANDAOSHIJIFUJIAOXIAOYUJISUANJIAODUSHI,PAIQIFAYINGSHEZAIXIAWANQUXIANYUZHIXIANDEJIAODIANCHU;  3.WEISHIGUANNEIQITIJINZAOPAICHUERBUXINGCHENGQINANG,XIAWANGUANXIANYUZHIGUANXIANDEJIAODIANJUNYINGSHEPAIQIFA;

  4.BENWENSUOZENGSHEDEPAIQIFABUNENGQUDAIZUIGAODIANPAIQIFA。   YI、QIANYANSHUSHUIGUANDAO,ZHUYAOZHISHUIYUANZHIJINGSHUICHANGHUOJINGSHUICHANGZHIPEISHUIGUANWANGDEGUANDAO。YOUYUGUANBICHUDEWENLIUHELIUSUHEQIEXIANTEXING,SHIYIXIEJINGGUOPAIQIGUANDEXIAOQIPAOYUEGUOPAIQIKONGYEXIANGXIAYOULIUQU。YINGUANBIYOUYIDINGCUCAODU,GEQIPAOYUNDONGFANGXIANGXIANGTONG,HENNANJUJICHENGDAQIPAO。(YUANZI:YUZHOUWUJINWANG)。ZAISHANGPODUAN,YOUYUFULIDEZUOYONG,QIPAOLIUSUKENENGDAYUSHUILIUSU。XIAMIANDUIGUANDAOZHONGQINANGDEXINGCHENGGUOCHENGHETADESHOULIQINGKUANGJINXINGFENXI:  1.QITIDEJUJIJIPINGHENGZAIZHENGCHANGQINGKUANGXIA,GUANDAOZHONGDESHUILIUKEJINSIDIKANCHENGSHIHENGDINGLIU(YALI、LIUSU、WENDUBUBIAN)。ZHEISHIQINANGDETIJIHEDUANMIANJIJIANDANJISUANWEI:  V≈0.5πr3,S≈0.2πr2。  

  GENJUMONICELIANG,QINANGDEZHANGLYUGAOhDEGUANXIWEI:  1≈15h  3.QINANGSHOULIFENXIJILINJIEWEIZHIGENJUSHUILIXUEYUANLI,QINANGZAIGUANDAONEIPINGHENGSHISUOSHOUSHUILIUDETUILI,DENGYUCHUIZHIYUSHUILIUDEJIEMIANSUOSHOUDEYALIZHEIGEJIEMIANWEIYIhWEIGAODEGONGXING  nVBANLIANSHISHUSONGJI2  p'=∑pi=-----.S(5)  12g10  S--GONGXINGZAIJI  QINANGNENGYINQIBAOGUAN,SHIYOUYUKUAISULINSHIGUOLVQIKAIGUANFAMENHUOSHUIBENGQITING,SHIGUANDAOCHUYILEDIMAISHIXIANGBIANDADEYALIZENGZHI,QITIDEKEYASUOTEXING,SHIYINGLIJIZHONGDAOQINANGCHANSHENGGAOYAERBAOGUAN。  DUIQIANLIZHONGDN800GUANDAO,DANGV=1.0m/sSHI,SUOSHOUTUILIAN(5)SHIJISUAN:  1.02  p'=------0.2π.402=5.124(Kg)  2g  SUOSHOUFULIAN(1)SHIJISUAN  P1=PSinα=0.5π0.43×DIANJIJILIAOJI1000Sinα=100.5SinDANGP`=P1SHI  5.214  α=arcSin=-----------=2.92°  100.5  GAIFUJIAOαYUSHICEBAOGUANDIANFUJIAOJIBENWENHE。  

  在这种状态下,水中的气体要逐渐地析出,形成大小不等的气泡上升到管壁,气泡按水流流速向前运动。鹤岗市属低山丘陵区,净水厂与送水泵站分建,二者相距5公里,净化水靠重力流送至送水泵站,净水厂清水池高程210m,送水泵站清水池高程185m,输水管为DN800连续铸铁管,平均流速1.0m/s,泵站前500m有一高岗,高程185,高岗的最高点有一排气阀,但排气阀后50m处,多次发生爆管事故,后来在爆管处加装了一双口排气阀,几年来,两排气阀间没再爆管,只在新装排气阀后10m处发生过一次爆管。

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