在渦街流量計的使用中,大約50%的de渦wo街jie流liu量liang計ji用yong於yu蒸zheng汽qi流liu量liang測ce量liang。渦wo街jie流liu量liang計ji檢jian測ce的de是shi流liu體ti流liu量liang在zai工gong作zuo狀zhuang態tai下xia的de體ti積ji流liu量liang。用yong渦wo街jie流liu量liang計ji檢jian測ce蒸zheng汽qi流liu量liang時shi,習xi慣guan上shang以yi質zhi量liang流liu量liang表biao示shi,因yin為wei折zhe算suan係xi數shu中zhong包bao含han流liu體ti密mi度du的de因yin素su,所suo以yi流liu體ti性xing質zhi的de變bian化hua及ji操cao作zuo條tiao件jian的de波bo動dong都dou需xu要yao進jin行xing補bu償chang,否fou則ze會hui產chan生sheng流liu量liang計ji較jiao大da的de誤wu差cha。
蒸汽流量測量中溫壓補償的目的,是在蒸汽的工況偏離設計工況時,將蒸汽的密度對測量結果的影響予以修正。
wojieliuliangjideshuchuyuliuguoceliangguandeliutiliusuchengzhengbi,zaiceliangshibaohezhengqishi,shuididuiwojieliuliangjishuchudeyingxiangkehulve,yinweikeyirenweiwojieliuliangjideshuchuwanquanyoushizhengqideganqibufensuoyinqi(通常渦街流量計用於氣體流量測量的釋放頻率是液體流量測量的1O倍),無wu論lun是shi壓ya力li補bu償chang或huo溫wen度du補bu償chang,幹gan氣qi部bu分fen的de密mi度du都dou可ke以yi較jiao正zheng確que地di查zha出chu。當dang然ran如ru果guo冷leng凝ning水shui也ye按an照zhao蒸zheng汽qi一yi樣yang收shou費fei,則ze渦wo街jie流liu量liang計ji的de計ji量liang結jie果guo則ze偏pian低di了le。
(1)渦街流量計用於液體流量測量時,流體中帶氣體會導致渦街流量計K值(zhi)的(de)變(bian)化(hua)。設(she)計(ji)選(xuan)型(xing)中(zhong),這(zhe)方(fang)麵(mian)因(yin)素(su)由(you)於(yu)難(nan)以(yi)確(que)定(ding),往(wang)往(wang)被(bei)忽(hu)視(shi)。,當(dang)測(ce)量(liang)容(rong)易(yi)氣(qi)化(hua)的(de)液(ye)體(ti)或(huo)工(gong)作(zuo)條(tiao)件(jian)接(jie)近(jin)臨(lin)界(jie)狀(zhuang)態(tai)的(de)液(ye)體(ti)時(shi),應(ying)仔(zai)細(xi)考(kao)慮(lv)工(gong)藝(yi)條(tiao)件(jian),防(fang)止(zhi)氣(qi)穴(xue)現(xian)象(xiang)發(fa)生(sheng),否(fou)則(ze)會(hui)影(ying)響(xiang)計(ji)量(liang)精(jing)度(du),甚(shen)至(zhi)造(zao)成(cheng)儀(yi)表(biao)不(bu)能(neng)正(zheng)常(chang)工(gong)作(zuo)。所(suo)謂(wei)氣(qi)穴(xue)現(xian)象(xiang)是(shi)指(zhi)由(you)於(yu)壓(ya)力(li)損(sun)失(shi)造(zao)成(cheng)流(liu)量(liang)計(ji)下(xia)遊(you)壓(ya)力(li)降(jiang)低(di),變(bian)得(de)低(di)於(yu)被(bei)測(ce)液(ye)體(ti)使(shi)用(yong)溫(wen)度(du)下(xia)的(de)飽(bao)和(he)蒸(zheng)汽(qi)壓(ya)而(er)產(chan)生(sheng)氣(qi)泡(pao)。
(2)渦(wo)街(jie)流(liu)量(liang)計(ji)用(yong)於(yu)石(shi)油(you)化(hua)工(gong)裝(zhuang)置(zhi)理(li)應(ying)進(jin)行(xing)現(xian)場(chang)實(shi)際(ji)標(biao)定(ding),而(er)標(biao)定(ding)設(she)備(bei)投(tou)資(zi)費(fei)用(yong)很(hen)高(gao),幾(ji)乎(hu)全(quan)部(bu)用(yong)戶(hu)都(dou)沒(mei)有(you)這(zhe)方(fang)麵(mian)條(tiao)件(jian),使(shi)儀(yi)表(biao)固(gu)有(you)誤(wu)差(cha)無(wu)法(fa)消(xiao)除(chu)。儀(yi)表(biao)長(chang)期(qi)無(wu)法(fa)標(biao)定(ding),同(tong)樣(yang)會(hui)帶(dai)來(lai)儀(yi)表(biao)漂(piao)移(yi)誤(wu)差(cha)長(chang)期(qi)無(wu)法(fa)消(xiao)除(chu)的(de)問(wen)題(ti)。