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蒸汽流量测量不准确的2大原因 流量仪表如何正确选型
发布时间: 2018-5-22 10:23:17

 1 引言
og电子app   供热行业中,蒸汽流量测量不准确是普遍存在的问题,其中主要原因分析如下。

  1.1 guorezhengqi

  zhengqishibijiaoteshudejiezhi,yibanqingkuangxiasuoshuodezhengqishizhiguorezhengqi。guorezhengqishichangjiandedonglinengyuan,changyonglaidaidongqilunjixuanzhuan,jinerdaidongfadianjihuolixinshiyasuojigongzuo。guorezhengqishiyoubaohezhengqijiareshengwenhuode。qizhongjuebuhanyedihuoyewu,shuyushijiqiti。guorezhengqidewenduyuyalicanshushilianggedulicanshu,qimiduyingyouzheilianggecanshujueding。

  guorezhengqizaijingguozhangjulishusonghou,suizhegongkuang(ruwendu、yali)debianhua,tebieshizaiguoredubugaodeqingkuangxia,huiyinweireliangsunshiwendujiangdiershiqicongguorezhuangtaijinrubaohehuoguobaohezhuangtai,zhuanbianchengweibaohezhengqihuodaiyoushuidideguobaohezhengqi。baohezhengqiturandafudujianya,yetichuxianjuerepengzhangshiyehuizhuanbianchengweiguorezhengqi,zheiyangjiuxingchengqiyeliangxiangliujiezhi。

  1.2 baohezhengqi

og电子app  weijingguorechulidezhengqichengweibaohezhengqi。tashiwuse、wuwei、bunengranshaoyouwufushixingdeqiti。baohezhengqijuyouruxiatedian。

og电子app  (1)baohezhengqidewenduyuyalizhijianyiyiduiying,erzhezhijianzhiyouyigedulibianliang。

  (2)baohezhengqirongyiningjie,zaichuanshuguochengzhongruyoureliangsunshi,zhengqizhongbianyouyedihuoyewuxingcheng,bingdaozhiwenduyuyalidejiangdi。hanyouyedihuoyewudezhengqichengweishizhengqi。yangelaishuo,baohezhengqihuoduohuoshaodouhanyouyedihuoyewudeshuangxiangliuti,suoyi,butongzhuangtaixiabunengyongtongyiqitizhuangtaifangchengshilaimiaoshu。baohezhengqizhongyedihuoyewudehanliangfanyinglezhengqidezhiliang,yibanyongganduzheiyicanshulaibiaoshi。zhengqidegandushizhidanweitijibaohezhengqizhongganzhengqisuozhandebaifenshu,yi“x”biaoshi。

og电子app  (3)zhunquejiliangbaohezhengqiliuliangbijiaokunnan,yinweibaohezhengqidegandunanyibaozheng,yibanliuliangjidoubunengzhunquejianceshuangxiangliutideliuliang,zhengqiyalibodongjiangyinqizhengqimidudebianhua,liuliangjishizhichanshengfujiawucha。suoyizaizhengqijiliangzhong,bixushefabaochiceliangdianchuzhengqideganduyimanzuyaoqiu,biyaoshihaiyingcaiqubuchangcuoshi,shixianzhunquedeceliang。

 

  2 测量的分析
og电子app   目前使用流量仪表测量蒸汽流量,测量介质都是指单相的过热蒸汽或饱和蒸汽。对于相流经常变化的蒸汽,肯定会存在测量不准确的问题。这个问题的解决方法是保持蒸汽的过热度,尽量减少蒸汽的含水量,例如加强蒸汽管道的保温措施,减少蒸汽的压力损失等,以提高测量的准确度。然而这些方法并不能彻底解决蒸汽流量测量不准确的问题,解决这一问题的根本办法是开发一种可测两相流动介质的流量仪表。

og电子app  yongyujianceqitiliuliangdeliuliangjizhongleihenduo,yisudushiherongjiliuliangjiyingyongzuipubian,tamendegongtongtedianshizhinenglianxucedinggongkuangxiadetijiliuliang,ertijiliuliangyoushizhuangtaidehanshu,gongzuozhuangtaixiadetijiliuliangbunengqueqiedebiaoshishijiliuliang,gongchengshangyibandouyibiaozhunzhuangtaitijiliulianghuozhiliangliuliangbiaoshi。suoweibiaozhunzhuangtaitijishi0℃、1gebiaozhundaqiyaxiadeqititijihuo20℃、1gebiaozhundaqiyaxiadetiji。yizhiliangliuliangweijiliangdanweideqingkuang,muqianyingyongbuduo。caiyongkeduqitiliuliangjishi,xuandingqitizhengchangwendu、yaliweishejitiaojian,jiangshejizhuangtaixiadetijiliuliangzhesuanweibiaozhuntijiliulianghuozhiliangliuliang,qizhesuanxishuzhonghanyouqitimidudeyinsu,dangqitijiezhidegongzuozhuangtaipianlishejizhuangtai,liuliangshizhijiangchanshengwucha。ciwaiqitijiezhidezucheng、hanlianghuowendudebianhua,duiliuliangceliangyechanshengyingxiang,suoyizhengqiliuliangdecelianggengxuyaocaiqubuchangcuoshi,bingqieyinzhengqidezhuangtaibianhuabuchangyinsuyebijiaofuza。

og电子app  guorezhengqidemiduyouzhengqidewendu、yalilianggecanshujueding,erqiezaicanshudebutongfanweinei,midudebiaodaxingshiyebuxiangtong,wufayongtongyitongshibiaoshi,suoyibunenghuodetongyidemidujisuangongshi,zhinenggebietuidaoqiudewendu、yalibuchanggongshi。zaiwendu、yalibodongfanweijiaodadechanghe,chujinxingwendu、yalibuchangwai,haixuyaokaolvduiqitipengzhangxishuεdebuchang。

og电子app  wuluncaiyonghezhongliuliangjijiancebaohezhengqideliuliang,zaizhengqiyalibodongdetiaojianxiagongzuo,bixucaiquyalibuchangcuoshi,zheishiyinweizailiuliangfangchengzhong,douhanyouzhengqimidudeyinsu,gongzuotiaojianyushejitiaojianbuyizhishi,dushuhuichanshengwucha,wuchadedaxiaohegongzuoyaliyushejiyalipianchadedaxiaoyouguan,pshi>pshejiangchuxianfuwucha,fouzejiangchuxianzhengwucha。zhengqidegandutiaojianshiguanxidaonengfouzhunquejiliangzhengqiliuliangdezhongyaotiaojian,muqianzhengzaiyanzhizaixianzhengqigandujianceyibiao,daiganduyibiaoyingyongyuzhengqiliuliangjiliangyubuchangxitong,bijiangjinyibutigaojiliangdezhunquexing。muqianyingcaiquyixiasanxiangcuoshi:

  (1)shusongzhengqideguanlubixuyoulianghaodebaowencuoshifangzhireliangsunshi。

  (2)zaizhengqiguanlushangyaozhuduanshushui,zaiguandaodezuidichujiyibiaoqiandeguandaoshangyingshezhishushuiqi,jishipaichulengningshui。

og电子app  (3)guolucaozuozhongyingbimianchuxianqibaoyeweiguogaoxianxiang,jinliangjianshaofuhechuxiandadebodong。

  3 流量仪表的选型
  对于蒸汽计量在选择流量仪表时应考虑5个主要因素: 被测流体特性、生产工艺情况、安装条件、维护需求以及流量仪表的特性。这里,着重讨论流量仪表的特性、安装条件、维护需求以及选用流量仪表应注意的几个问题。目前,测量蒸汽流量的仪表主要有涡街流量计、差压式(孔板、均速管、弯管)流量计、分流旋翼式流量计、阿牛巴流量计、浮子式流量计等,下面以涡街流量计、孔板流量计和弯管流量计为例加以说明。

  3.1 wojieliuliangji

  wojieliuliangjishijiyukamenwojieyuanlieryanzhichenggongdeyizhongxinxingliuliangji,youyutajuyouqitaliuliangjibukejiandedeyoudian,70niandaiyilaidedaolexunsufazhan。jujieshao,xianzairiben、oumeidengfadaguojiashiyongwojieliuliangjidebilidafudushangsheng,yijingguangfanyongyugegelingyu,jiangzaiweilailiuliangyibiaozhongzhanzhudaodiwei,shikongbanliuliangjidelixiangtidaichanpin。tajuyouyixiatedian:

  ① jiegoujiandanlaogu,wukedongbujian,zhangqiyunxingshifenkekao;

og电子app  ② weihushifenfangbian,anzhuangfeiyongdi;

  ③ chuanganqibuzhijiejiechujiezhi,xingnengwending,shoumingzhang;

  ④ shuchuyuliuliangchengzhengbidemaichongxinhao,wulingdianpiaoyi,jingdugao,bingfangbianyujisuanjilianwang;

  ⑤ celiangfanweikuan,liangchengbikeda1: 10;

  ⑥ yalisunshixiao,yunxingfeiyongdi,gengjujienengyiyi;

  ⑦ zaiyidingdeleinuoshufanweinei,shuchuxinhaopinlvbushouliutiwulixingzhihezufenbianhuayingxiang,yibiaoxishujinyuxuanwofashengtidexingzhuanghechicunyouguan,celiangliutidetijiliuliangwuxubuchang,diaohuanpeijianhouwuxuzhongxinbiaodingyibiaodexishu;

  ⑧ yingyongfanweiguang,qiti、yetideliuliangjunkeceliang;

  ⑨ jiandingzhouqiwei2~4nian。

  dangailiuliangjiyecunzaiyidingdejuxianxing:

og电子app  ① wojieliuliangjishiyizhongsudushiliuliangji,xuanwofenlidewendingxingshouliusuyingxiang,gutaduizhiguanduanyouyidingdeyaoqiu,yibanshiqian10d、hou5d;

  ② celiangyetishi,shangxianliusushouyasunheqishixianxiangxianzhi,yibanshi0.5~8m/s;

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

  ④ yinglishiwojieliuliangjiduizhendongjiaoweimingan,guzaizhendongjiaodadeguandaoanzhuangliuliangjishi,guandaoyaoyouyidingdejianzhencuoshi;

og电子app  ⑤ yinglishiwojieliuliangjicaiyongyadianjingtizuoweijiancechuanganqi,guqishouwendudexianzhi,yibanwei-40~+300℃。

  3.2 chayashiliuliangji

og电子app  yikongbanliuliangjiweidaibiaodechayashiliuliangjiyingyonglishiyoujiu,youguojibiaozhun,lilunjingdugao,yingyongshifenpubian。danjingguojishiniandeyingyong,faxiankongbanliuliangjiyecunzaibuzu:

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

og电子app  ② anzhuangjiaoweimafan,weihujichaixidegongzuoliangjiaoda;

  ③ xupeichayabiansongqishiyong,zengjialeweihudegongzuoliang,lingxufushedaoyaguan,qiezaidongjixuduidaoyaguanjinxingbaowen,bukeyianzhuangzaishiwai;

  ④ liuliangliangchengbiwei1: 3,juxianxingda;

  ⑤ ruoanzhuangbuzhengque,rongyifashengzhengqixielou;

og电子app  ⑥ yalisunshijiaoda,yunxingfeiyonggao。

og电子app  3.3 wanguanliuliangji

  wanguanliuliangjishijishangshiyige90dubiaozhunwantou,meiyoubitajiegougengjiandandeliuliangchuanganqile。suizhejixiejiagonggongyedefazhanhexingyebiaozhunhuajiguifanhuaguanlidebuduanwanshan,yongzuowanguanchuanganqidebiaozhunjizhiwantouxingjiabiyuelaiyuegao。tadetedianshi:

og电子app  ① jiegoujiandan,jiagedilian。

  ② wanguanliuliangjichuanganqinaimosun,duiweiliangmosunbumingan。

og电子app  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。

og电子app  ⑥ wanguanliuliangjiyouyuqiteshudeceliangyuanli,shiqizaishijiyingyongshiduizhiguanduandeyaoqiubuyange,yibanzhiyaoqiuqian5d、hou2djike,yuanyuandiyuqitaliuliangceliangzhuangzhideyaoqiu。

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

og电子app  ⑧ wanguanliuliangjidezuituchutedianshiwurenhefujiajieliujianhuocharujian,kedadajiangdiliutizaiguandaoneishusongdedonglixiaohao,jieyuenengyuan,youqiduineixiedaxitong、daguanjing、diyatoudeceliangduixianghaochugengjiamingxian。

  julishuoming: weiweichiyitaianzhuangzaimeixiaoshishuqiandunliulianggongreguandaodekongbanliuliangjizhengchangyunxing,yigecainuanjijieyuexuduohaodianshuwandu,zheherenminbishuwanyuan。zheilijinkaolvkongbanliuliangjiyalisunshiweijiqianpa,shijiyunxingshiyuanyuanchaoguozheigezhi。jibianshizheijiqianpadeyalisunshi,tasuozaochengdefujiayunxingfeiyongyeshibukehushide。biao1jichudeshujuweimuqianreliguanwangyongzhuguandaoliuliangfanweizaibutongdeyalisunshishi,kongbanliuliangjiyinqidexunhuanbengewaihaodianliang、dianhaofeiyong、zhehebiaozhunmeiliang、goumeifeiyongdedantaikongbanliuliangjizaiyigequnuanjijieyunxingfeiyongdeshuju,qizhongyunxingtianshuan120tian、dianjiaan0.35yuan/du、biaozhunmeijiaan200yuan/tjisuan。

og电子app  yigeliuliangwei4000m3/hdezhongxingrewang,dangkongbanyalisunshiwei30qianpashi,jinyitaikongbanliuliangjijiuduohao9.6wandudian,yunxingfeiyongwei3.12wanyuan,duiyuliuliangwei10000m3/hdedaxingrewang,ewaihaodianliangda24wandu,yunxingfeiyong7.8wanyuan。erwanguanliuliangjijinxingceliangfujiazulisunshijiuhuixiaodeduo,ruguoyongwanguanliuliangjitidaikongbanliuliangjijinxingjiliang,kedadadijianshaoyunxingfeiyong,huodekeguandejingjixiaoyi。

og电子app  zongshangsuoshu,zhengqiliuliangyibiaodexuanyongshifeichangzhongyaode,zhunqueceliangzhengqiliuliangshishengchanbumendouxuyaohepubianguanxindewenti。suizhejingjidefazhan,tigaoceliangshuipingdehushengyuelaiyuegao。yinci,yingzhenduishengchanshijiqingkuang,zuoyixiexizhidejishugongzuo,qieshitansuochuyitiaozhengqiliuliangceliangdechenggongzhilu

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