Isingeniso kanye nokulinganisa ukusetshenziswa kwe-vortex flowmeter

I-flowmeter ejwayelekile ye-orifice yayisetshenziswa kabanzi ekulinganisweni kokugeleza kwe-steam egcwele ngawo-1980, kodwa kusukela ekuthuthukisweni kwezinsimbi zokugeleza, nakuba i-orifice flowmeter inomlando omude kanye nohlu olubanzi lwezinhlelo zokusebenza; Abantu bamfunde kahle futhi idatha yokuhlola iphelele, kodwa kusekhona okunye ukushiyeka ekusebenziseni i-orifice flowmeter ejwayelekile ukukala ukugeleza kwe-steam egcwele: okokuqala, ukulahlekelwa kwengcindezi kukhulu; Okwesibili, ipayipi lomfutho, amaqembu amathathu ama-valve nezixhumi kulula ukuvuza; Okwesithathu, ububanzi bokulinganisa buncane, ngokuvamile bungu-3:1, okulula ukubangela amanani aphansi okulinganisa ukushintshashintsha okukhulu kokugeleza. I-vortex flowmeter inesakhiwo esilula, futhi i-vortex transmitter ifakwe ngokuqondile epayipini, elinqoba isenzakalo sokuvuza kwepayipi. Ngaphezu kwalokho, i-vortex flowmeter inokulahlekelwa kwengcindezi encane kanye nobubanzi obubanzi, futhi isilinganiso sobubanzi bokulinganisa besitimu esigcwele singafinyelela ku-30:1. Ngakho-ke, ngokuvuthwa kobuchwepheshe bokulinganisa i-vortex flowmeter, ukusetshenziswa kwe-vortex flowmeter kuyathandwa kakhulu.

1. Umgomo wokulinganisa we-vortex flowmeter

I-Vortex flowmeter isebenzisa isimiso se-fluid oscillation ukukala ukugeleza. Lapho uketshezi ludlula kusidlulisi sokugeleza kwe-vortex epayipini, imigqa emibili yama-vortices ngokulingana nezinga lokugeleza ikhiqizwa ngokushintshana phezulu naphansi ngemuva kwejeneretha ye-vortex yekholomu engunxantathu. Imvamisa yokukhululwa kwe-vortex ihlobene nesivinini esimaphakathi soketshezi olugeleza kujeneretha ye-vortex kanye nobubanzi besici sejeneretha ye-vortex, engavezwa ngale ndlela elandelayo:

Kuphi: F imvamisa yokukhululwa kwe-vortex, Hz; V isivinini esimaphakathi soketshezi olugeleza kujeneretha ye-vortex, m/s; D ububanzi besici se-vortex generator, m; I-ST iyinombolo ye-Strouhal, ayinamkhawulo, futhi ububanzi bayo benani bungu-0.14-0.27. I-ST iwumsebenzi wenombolo kaReynolds, st=f (1/re).

Uma inombolo ye-Reynolds Reynolds iphakathi kuka-102-105, inani le-st lingaba ngu-0.2. Ngakho-ke, esilinganisweni, inombolo ye-Reynolds yoketshezi kufanele ibe ngu-102-105 kanye ne-vortex frequency f=0.2v/d.

Ngakho-ke, isilinganiso sesivinini V soketshezi olugeleza ngejeneretha ye-vortex singabalwa ngokulinganisa imvamisa ye-vortex, bese ukugeleza okungu-Q kungatholwa kufomula q=va, lapho u-a kuyindawo enqamulayo yoketshezi olugelezayo. ngokusebenzisa i-vortex generator.

Lapho i-vortex ikhiqizwa ezinhlangothini zombili zejeneretha, inzwa ye-piezoelectric isetshenziselwa ukukala ushintsho olushintshayo lwe-lift perpendicular to fluid flow direction, ukuguqula uguquko lokuphakamisa lube isignali yefrikhwensi kagesi, ikhulise futhi ilolonge isignali yefrikhwensi, futhi iyikhiphe. kokokusebenza kwesibili ukuze kuqoqwe futhi kuboniswe.

2. Ukusetshenziswa kwe-vortex flowmeter

2.1 ukukhethwa kwe-vortex flowmeter

2.1.1 ukukhethwa kwe-vortex flow transmitter

Esilinganisweni se-steam esigcwele, inkampani yethu yamukela i-VA yohlobo lwe-piezoelectric vortex flow transmitter ekhiqizwa yi-Hefei Instrument General Factory. Ngenxa yobubanzi obubanzi be-vortex flowmeter, ekusebenzeni okusebenzayo, ngokuvamile kubhekwa ukuthi ukugeleza kwesitimu esigcwele akukona okuphansi kunomkhawulo ophansi we-vortex flowmeter, okusho ukuthi, izinga lokugeleza kwamanzi akumele libe ngaphansi kuka-5m / s. Ama-Vortex flow transmitters anama-diameter ahlukene akhethwa ngokusho kokusetshenziswa kwe-steam, kunokuba ama-diameter epayipi enqubo ekhona.

2.1.2 ukukhethwa kwesidlulisi somfutho esinxephezelweni sokucindezela

Ngenxa yepayipi lesitimu eligcwele isikhathi eside kanye nokuguquguquka okukhulu kwengcindezi, kufanele kuthathwe isinxephezelo sokucindezela. Uma kucatshangelwa ubudlelwano obuhambisanayo phakathi kwengcindezi, izinga lokushisa kanye nokuminyana, isinxephezelo sokucindezela kuphela esingamukelwa esilinganisweni. Njengoba ingcindezi yesitimu egcwele yepayipi lenkampani yethu iku-0.3-0.7mpa, uhla lwesidluliseli somfutho lungakhethwa njenge-1MPa.