|ag手机客户端二维码

計量知識

|ag手机客户端二维码dianhua:010-60538612

|ag手机客户端二维码chuanzhen:010-58041980

計量知識
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蒸汽流量測量不準確的2大原因 流量儀表如何正確選型
發布時間:2018-5-22 10:23:17

 1 引言
  供熱行業中,蒸汽流量測量不準確是普遍存在的問題,其中主要原因分析如下。

  1.1 guorezhengqi

|ag手机客户端二维码  zhengqishibijiaoteshudejiezhi,yibanqingkuangxiasuoshuodezhengqishizhiguorezhengqi。guorezhengqishichangjiandedonglinengyuan,changyonglaidaidongqilunjixuanzhuan,jinerdaidongfadianjihuolixinshiyasuojigongzuo。guorezhengqishiyoubaohezhengqijiareshengwenhuode。qizhongjuebuhanyedihuoyewu,shuyushijiqiti。guorezhengqidewenduyuyalicanshushilianggedulicanshu,qimiduyingyouzhelianggecanshujueding。

  guorezhengqizaijingguochangjulishusonghou,suizhugongkuang(ruwendu、yali)debianhua,tebieshizaiguoredubugaodeqingkuangxia,huiyinweireliangsunshiwendujiangdiershiqicongguorezhuangtaijinrubaohehuoguobaohezhuangtai,zhuanbianchengweibaohezhengqihuodaiyoushuidideguobaohezhengqi。baohezhengqiturandafudujianya,yetichuxianjuerepengzhangshiyehuizhuanbianchengweiguorezhengqi,zheyangjiuxingchengqiyeliangxiangliujiezhi。

  1.2 baohezhengqi

|ag手机客户端二维码  weijingguorechulidezhengqichengweibaohezhengqi。tashiwuse、wuwei、bunengranshaoyouwufushixingdeqiti。baohezhengqijuyouruxiatedian。

  (1)baohezhengqidewenduyuyalizhijianyiyiduiying,erzhezhijianzhiyouyigedulibianliang。

|ag手机客户端二维码  (2)baohezhengqirongyiningjie,zaichuanshuguochengzhongruyoureliangsunshi,zhengqizhongbianyouyedihuoyewuxingcheng,bingdaozhiwenduyuyalidejiangdi。hanyouyedihuoyewudezhengqichengweishizhengqi。yangelaishuo,baohezhengqihuoduohuoshaodouhanyouyedihuoyewudeshuangxiangliuti,suoyi,butongzhuangtaixiabunengyongtongyiqitizhuangtaifangchengshilaimiaoshu。baohezhengqizhongyedihuoyewudehanliangfanyinglezhengqidezhiliang,yibanyongganduzheyicanshulaibiaoshi。zhengqidegandushizhidanweitijibaohezhengqizhongganzhengqisuozhandebaifenshu,yi“x”biaoshi。

  (3)zhunquejiliangbaohezhengqiliuliangbijiaokunnan,yinweibaohezhengqidegandunanyibaozheng,yibanliuliangjidoubunengzhunquejianceshuangxiangliutideliuliang,zhengqiyalibodongjiangyinqizhengqimidudebianhua,liuliangjishizhichanshengfujiawucha。suoyizaizhengqijiliangzhong,bixushefabaochiceliangdianchuzhengqideganduyimanzuyaoqiu,biyaoshihuanyingcaiqubuchangcuoshi,shixianzhunquedeceliang。

 

  2 測量的分析
  目前使用流量儀表測量蒸汽流量,測量介質都是指單相的過熱蒸汽或飽和蒸汽。對于相流經常變化的蒸汽,肯定會存在測量不準確的問題。這個問題的解決方法是保持蒸汽的過熱度,盡量減少蒸汽的含水量,例如加強蒸汽管道的保溫措施,減少蒸汽的壓力損失等,以提高測量的準確度。然而這些方法并不能徹底解決蒸汽流量測量不準確的問題,解決這一問題的根本辦法是開發一種可測兩相流動介質的流量儀表。

|ag手机客户端二维码  yongyujianceqitiliuliangdeliuliangjizhongleihenduo,yisudushiherongjiliuliangjiyingyongzuipubian,tamendegongtongtedianshizhinenglianxucedinggongkuangxiadetijiliuliang,ertijiliuliangyoushizhuangtaidehanshu,gongzuozhuangtaixiadetijiliuliangbunengqueqiedebiaoshishijiliuliang,gongchengshangyibandouyibiaozhunzhuangtaitijiliulianghuozhiliangliuliangbiaoshi。suoweibiaozhunzhuangtaitijishi0℃、1gebiaozhundaqiyaxiadeqititijihuo20℃、1gebiaozhundaqiyaxiadetiji。yizhiliangliuliangweijiliangdanweideqingkuang,muqianyingyongbuduo。caiyongkeduqitiliuliangjishi,xuandingqitizhengchangwendu、yaliweishejitiaojian,jiangshejizhuangtaixiadetijiliuliangzhesuanweibiaozhuntijiliulianghuozhiliangliuliang,qizhesuanxishuzhonghanyouqitimidudeyinsu,dangqitijiezhidegongzuozhuangtaipianlishejizhuangtai,liuliangshizhijiangchanshengwucha。ciwaiqitijiezhidezucheng、hanlianghuowendudebianhua,duiliuliangceliangyechanshengyingxiang,suoyizhengqiliuliangdecelianggengxuyaocaiqubuchangcuoshi,bingqieyinzhengqidezhuangtaibianhuabuchangyinsuyebijiaofuza。

  guorezhengqidemiduyouzhengqidewendu、yalilianggecanshujueding,erqiezaicanshudebutongfanweinei,midudebiaodaxingshiyebuxiangtong,wufayongtongyitongshibiaoshi,suoyibunenghuodetongyidemidujisuangongshi,zhinenggebietuidaoqiudewendu、yalibuchanggongshi。zaiwendu、yalibodongfanweijiaodadechanghe,chujinxingwendu、yalibuchangwai,huanxuyaokaolvduiqitipengzhangxishuεdebuchang。

  wuluncaiyonghezhongliuliangjijiancebaohezhengqideliuliang,zaizhengqiyalibodongdetiaojianxiagongzuo,bixucaiquyalibuchangcuoshi,zheshiyinweizailiuliangfangchengzhong,douhanyouzhengqimidudeyinsu,gongzuotiaojianyushejitiaojianbuyizhishi,dushuhuichanshengwucha,wuchadedaxiaohegongzuoyaliyushejiyalipianchadedaxiaoyouguan,pshi>pshejiangchuxianfuwucha,fouzejiangchuxianzhengwucha。zhengqidegandutiaojianshiguanxidaonengfouzhunquejiliangzhengqiliuliangdezhongyaotiaojian,muqianzhengzaiyanzhizaixianzhengqigandujianceyibiao,daiganduyibiaoyingyongyuzhengqiliuliangjiliangyubuchangxitong,bijiangjinyibutigaojiliangdezhunquexing。muqianyingcaiquyixiasanxiangcuoshi:

|ag手机客户端二维码  (1)shusongzhengqideguanlubixuyoulianghaodebaowencuoshifangzhireliangsunshi。

|ag手机客户端二维码  (2)zaizhengqiguanlushangyaozhuduanshushui,zaiguandaodezuidichujiyibiaoqiandeguandaoshangyingshezhishushuiqi,jishipaichulengningshui。

  (3)guolucaozuozhongyingbimianchuxianqibaoyeweiguogaoxianxiang,jinliangjianshaofuhechuxiandadebodong。

  3 流量儀表的選型
  對于蒸汽計量在選擇流量儀表時應考慮5個主要因素:被測流體特性、生產工藝情況、安裝條件、維護需求以及流量儀表的特性。這里,著重討論流量儀表的特性、安裝條件、維護需求以及選用流量儀表應注意的幾個問題。目前,測量蒸汽流量的儀表主要有渦街流量計、差壓式(孔板、均速管、彎管)流量計、分流旋翼式流量計、阿牛巴流量計、浮子式流量計等,下面以渦街流量計、孔板流量計和彎管流量計為例加以說明。

|ag手机客户端二维码  3.1 wojieliuliangji

|ag手机客户端二维码  wojieliuliangjishijiyukamenwojieyuanlieryanzhichenggongdeyizhongxinxingliuliangji,youyutajuyouqitaliuliangjibukejiandedeyoudian,70niandaiyilaidedaolexunsufazhan。jujieshao,xianzairiben、oumeidengfadaguojiashiyongwojieliuliangjidebilidafudushangsheng,yijingguangfanyongyugegelingyu,jiangzaiweilailiuliangyibiaozhongzhanzhudaodiwei,shikongbanliuliangjidelixiangtidaichanpin。tajuyouyixiatedian:

|ag手机客户端二维码  ① jiegoujiandanlaogu,wukedongbujian,changqiyunxingshifenkekao;

|ag手机客户端二维码  ② weihushifenfangbian,anzhuangfeiyongdi;

  ③ chuanganqibuzhijiejiechujiezhi,xingnengwending,shoumingchang;

|ag手机客户端二维码  ④ shuchuyuliuliangchengzhengbidemochongxinhao,wulingdianpiaoyi,jingdugao,bingfangbianyujisuanjilianwang;

  ⑤ celiangfanweikuan,liangchengbikeda1:10;

  ⑥ yalisunshixiao,yunxingfeiyongdi,gengjujienengyiyi;

|ag手机客户端二维码  ⑦ zaiyidingdeleinuoshufanweinei,shuchuxinhaopinlvbushouliutiwulixingzhihezufenbianhuayingxiang,yibiaoxishujinyuxuanwofashengtidexingzhuanghechicunyouguan,celiangliutidetijiliuliangwuxubuchang,diaohuanpeijianhouwuxuzhongxinbiaodingyibiaodexishu;

  ⑧ yingyongfanweiguang,qiti、yetideliuliangjunkeceliang;

  ⑨ jiandingzhouqiwei2~4nian。

|ag手机客户端二维码  dangailiuliangjiyecunzaiyidingdejuxianxing:

|ag手机客户端二维码  ① wojieliuliangjishiyizhongsudushiliuliangji,xuanwofenlidewendingxingshouliusuyingxiang,gutaduizhiguanduanyouyidingdeyaoqiu,yibanshiqian10d、hou5d;

|ag手机客户端二维码  ② celiangyetishi,shangxianliusushouyasunheqishixianxiangxianzhi,yibanshi0.5~8m/s;

  ③ celiangqitishi,shangxianliusushoujiezhikeyasuoxingbianhuadexianzhi,xiaxianliusushouleinuoshuhechuanganqilingmindudexianzhi,zhengqishi8~25m/s;

  ④ yinglishiwojieliuliangjiduizhendongjiaoweimingan,guzaizhendongjiaodadeguandaoanzhuangliuliangjishi,guandaoyaoyouyidingdejianzhencuoshi;

|ag手机客户端二维码  ⑤ yinglishiwojieliuliangjicaiyongyadianjingtizuoweijiancechuanganqi,guqishouwendudexianzhi,yibanwei-40~+300℃。

  3.2 chayashiliuliangji

|ag手机客户端二维码  yikongbanliuliangjiweidaibiaodechayashiliuliangjiyingyonglishiyoujiu,youguojibiaozhun,lilunjingdugao,yingyongshifenpubian。danjingguojishiniandeyingyong,faxiankongbanliuliangjiyecunzaibuzu:

  ① yingyongzhongxuduoyinsu(shejicanshuyugongkuangcanshubufu,shangyouzhiguanduanbuzu,kongbanheguandaobutongxin,kongbanamianshouwu,ruijiaomosundeng)duiqiceliangjingduyoufeichangdadeyingxiang,shiqiceliangwuchazengda;

  ② anzhuangjiaoweimafan,weihujichaixidegongzuoliangjiaoda;

|ag手机客户端二维码  ③ xupeichayabiansongqishiyong,zengjialeweihudegongzuoliang,lingxufushedaoyaguan,qiezaidongjixuduidaoyaguanjinxingbaowen,bukeyianzhuangzaishiwai;

|ag手机客户端二维码  ④ liuliangliangchengbiwei1:3,juxianxingda;

  ⑤ ruoanzhuangbuzhengque,rongyifashengzhengqixielou;

|ag手机客户端二维码  ⑥ yalisunshijiaoda,yunxingfeiyonggao。

  3.3 wanguanliuliangji

|ag手机客户端二维码  wanguanliuliangjishijishangshiyige90dubiaozhunwantou,meiyoubitajiegougengjiandandeliuliangchuanganqile。suizhujixiejiagonggongyedefazhanhexingyebiaozhunhuajiguifanhuaguanlidebuduanwanshan,yongzuowanguanchuanganqidebiaozhunjizhiwantouxingjiabiyuelaiyuegao。tadetedianshi:

  ① jiegoujiandan,jiagedilian。

|ag手机客户端二维码  ② wanguanliuliangjichuanganqinaimosun,duiweiliangmosunbumingan。

|ag手机客户端二维码  ③ anzhuangjiandan,kecaiyongzhijiehanjiefajinxinganzhuang,shixianchangpaomaodiloudemafandedaochedidejiejue。

  ④ shiyingxingqiang,liangchengfanweikuan,zhiguanduanyaoqiubuyan。zhiyaoshikeyiyongkongban、wojie、junsuguanliuliangjilaiceliangdeguandaoneiliutiliuliangdoukeyiyongwanguanliuliangjijinxingceliang,erqiezainaigaowen、naigaoya、naichongji、naizhendong、naichaoshi、naifenchendengfangmian,wanguanliuliangjiyuanyouyuqitaliuliangji。

  ⑤ wanguanliuliangjideliangchengbikeda1:10,duiyuzhengqi,tadeshiyongfanweiwei0~70m/s,keyijiaohaodimanzuzhengqiliuliangceliangdeyaoqiu。

|ag手机客户端二维码  ⑥ wanguanliuliangjiyouyuqiteshudeceliangyuanli,shiqizaishijiyingyongshiduizhiguanduandeyaoqiubuyange,yibanzhiyaoqiuqian5d、hou2djike,yuanyuandiyuqitaliuliangceliangzhuangzhideyaoqiu。

  ⑦ wanguanliuliangjijingdugao,zhongxianxinghao,celiangjingdukeda1.14%,zhongxianxingjingdukeda0.2%,yicianzhuanghou,buzaixuyaozhongfuchaizhuang,yinci,qianzhuangjingduyenengdedaozuijiabaozheng。

  ⑧ wanguanliuliangjidezuituchutedianshiwurenhefujiajieliujianhuocharujian,kedadajiangdiliutizaiguandaoneishusongdedonglixiaohao,jieyuenengyuan,youqiduineixiedaxitong、daguanjing、diyatoudeceliangduixianghaochugengjiamingxian。

  julishuoming:weiweichiyitaianzhuangzaimeixiaoshishuqiandunliulianggongreguandaodekongbanliuliangjizhengchangyunxing,yigecainuanjijieyuexuduohaodianshuwandu,zheherenminbishuwanyuan。zhelijinkaolvkongbanliuliangjiyalisunshiweijiqianpa,shijiyunxingshiyuanyuanchaoguozhegezhi。jibianshizhejiqianpadeyalisunshi,tasuozaochengdefujiayunxingfeiyongyeshibukehushide。biao1geichudeshujuweimuqianreliguanwangyongzhuguandaoliuliangfanweizaibutongdeyalisunshishi,kongbanliuliangjiyinqidexunhuanbengewaihaodianliang、dianhaofeiyong、zhehebiaozhunmeiliang、goumeifeiyongdedantaikongbanliuliangjizaiyigequnuanjijieyunxingfeiyongdeshuju,qizhongyunxingtianshuan120tian、dianjiaan0.35yuan/du、biaozhunmeijiaan200yuan/tjisuan。

|ag手机客户端二维码  yigeliuliangwei4000m3/hdezhongxingrewang,dangkongbanyalisunshiwei30qianpashi,jinyitaikongbanliuliangjijiuduohao9.6wandudian,yunxingfeiyongwei3.12wanyuan,duiyuliuliangwei10000m3/hdedaxingrewang,ewaihaodianliangda24wandu,yunxingfeiyong7.8wanyuan。erwanguanliuliangjijinxingceliangfujiazulisunshijiuhuixiaodeduo,ruguoyongwanguanliuliangjitidaikongbanliuliangjijinxingjiliang,kedadadijianshaoyunxingfeiyong,huodekeguandejingjixiaoyi。

  zongshangsuoshu,zhengqiliuliangyibiaodexuanyongshifeichangzhongyaode,zhunqueceliangzhengqiliuliangshishengchanbumendouxuyaohepubianguanxindewenti。suizhujingjidefazhan,tigaoceliangshuipingdehushengyuelaiyuegao。yinci,yingzhenduishengchanshijiqingkuang,zuoyixiexizhidejishugongzuo,qieshitansuochuyitiaozhengqiliuliangceliangdechenggongzhilu

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