Kev ntsuas chav ntsuas tau muab faib ua ob pawg raws li kev ntsuas thev naus laus zis, ib qho yog chav dej superheated thiab saturated chav nrog siab dryness (dryness x=0.9 los yog ntau dua), thiab lwm yam yog saturated chav nrog tsawg dryness. Cov pawg qub tuaj yeem kho tau raws li cov kua dej ib zaug, thaum cov qeb tom kawg yog ob theem ntws. Txij li tag nrho cov flowmeters tam sim no tsuas yog tsim nyog rau cov kua dej ib zaug xwb, qhov tsis tshua muaj dej saturated chav yuav tsum tau kawm ntxiv.
1. Flow ntsuas ntawm superheated chav thiab siab dryness saturated chav
Feem ntau siv flowmeters yog: throttling sib txawv siab flowmeter, uas tseem yog cov cuab yeej tseem ceeb rau ntsuas cov dej ntws. Piv txwv li, lub throttling ntaus ntawv, qhov sib txawv siab transmitter thiab peb-valve pab pawg neeg yog kev koom ua ke rau hauv ib tug integrated throttling flowmeter. Lub throttling flowmeter daws qhov tsis txaus ntawm qhov sib txawv siab teeb liab lub raj tsis ua haujlwm. Kuj tseem muaj qhov cog throttling qhov chaw, thiab cov qauv nozzles yog siv los ntawm cov qauv orifices. Vim tias cov nozzles tau muab piv nrog cov ntawv orifice, lub outflow coefficient ntawm nozzles ruaj khov, thiab cov outflow coefficient yuav tsis hloov vim lub blunt ntug ntawm lub kaum ntse ntse. Lub siab poob kuj tseem qis dua li ntawm cov phaj orifice. , feem ntau ntawm tib tus nqi ntws thiab tus nqi, qhov poob siab yog li ntawm 30 feem pua rau 50 feem pua ntawm cov phaj orifice.
Lub vortex flowmeterntsuas kub nruab nrab, uas yog, qis dua 250 degree. Lub vortex flowmeter uas ua los ntawm peb lub tuam txhab yog resistant rau kub thiab kub siab, thiab kub tsis kam mus txog 350 degree. Nws yuav tsum tau hais tias daim ntawv thov rau chav muaj matured, thiab nws yog ib hom flowmeter feem ntau siv hauv chav ntsuas tam sim no. Txawm li cas los xij, nws yuav tsum tau muab sau tseg tias qhov nruab nrab uas tsis tshua muaj dryness yuav ua rau lub ntsuas coefficient sib txawv ntawm qhov ntsuas tus nqi thiab nce qhov kev ntsuas yuam kev.
Lub cev tsis sib xws ntawm lub raj flowmeter thiab shunt rotor flowmeter tseem tuaj yeem siv rau hauv kev tswj xyuas sab hauv qhov twg qhov kev xav tau raug tsis dhau siab, vim tias kev siv kuj pheej yig thiab yooj yim, thiab nws yog qhov tsim nyog rau kev ntsuas me me thiab nruab nrab ntws chav. .
Target flowmeter yog lub hom phiaj hluav taws xob thiab pneumatic flow transmitter tsim nyob rau xyoo 1970s. Nws yog ib qho cuab yeej tshawb nrhiav rau hluav taws xob thiab pneumatic chav tsev ua ke cov twj paj nruag. Txij li thaum lub zog hloov pauv ncaj qha siv lub zog sib npaug ntawm lub zog sib txawv ntawm lub sijhawm ntawd, nws coj ntau qhov tsis txaus los ntawm lub zog sib npaug ntawm nws tus kheej. Piv txwv li, qhov ntsuas qhov tseeb yog qhov tsawg, qhov xoom taw tes drift, kev ntseeg siab ntawm lub kauj mechanism, thiab qhov tsis zoo.
2. Flow ntsuas ntawm qis dryness saturated chav
Cov chav saturated uas tsim los ntawm kev lag luam boilers yog saturated steam nrog high dryness (saum toj no 0.95) ntawm lub qhov hluav taws xob, tab sis nyob rau hauv tus txheej txheem ntawm kev thauj mus los mus deb, vim muaj ntau yam xws li tsis zoo tshav kub preservation los yog tsis sib haum xeeb intermittent. steam siv, lub dryness yog tas li nce. poob, thiab txawm dhau los ua qhov ntub dej nrog cov ntsiab lus dej siab, uas yog, ob-theem kua roj thiab dej. Cov yam ntxwv ntws ntawm ob-theem kua yog qhov sib txawv ntawm cov dej ntws ib zaug. Flowmeter meter coefficients lossis outflow coefficients ntsuas hauv ib-theem ntws tsis tuaj yeem siv rau kev ntsuas ob-theem ntws. Piv txwv li, lub outflow coefficient nyob rau hauv ob-theem flow test ntawm lub orifice flowmeter yuav tsum tau kho kom qhuav. Yog li ntawd, nyob rau hauv lub flow ntsuas ntawm tsawg dryness saturated chav, lub dryness parameter yog ib tug parameter uas yuav tsum tau ntsuas. Nws yog ib qho nyuaj siab tias tseem tsis tau paub tab dryness meter. Tsis tas li ntawd, kev kho dryness ntawm lub meter coefficients ntawm lwm hom flowmeters tsis tau kawm hauv qhov tob. Tsuas yog los ntawm kev daws qhov teeb meem no tuaj yeem ntsuas qhov ntws ntawm qhov tsis muaj dryness saturated chav.