Vim li cas superheated chav yuav tsum tau txo kom saturated chav?

01. Saturated steam
Thaum cov dej kub npau npau rau hauv ib lub siab, cov dej pib vaporize thiab maj mam tig mus rau hauv chav.Lub sijhawm no, qhov kub thiab txias yog qhov kub thiab txias, uas yog hu ua "saturated steam".Qhov zoo tshaj plaws saturated steam lub xeev yog hais txog kev sib raug zoo ntawm ib-rau-ib qho ntawm qhov kub, siab thiab chav ntom ntom.

02.Superheated chav
Thaum cov saturated chav txuas ntxiv rau rhuab thiab nws qhov kub thiab txias siab tshaj qhov kub thiab txias nyob rau hauv lub siab no, lub chav yuav dhau los ua "superheated steam" nrog rau qee qhov kev ntsuas ntawm superheat.Lub sijhawm no, lub siab, qhov kub thiab qhov ntom ntom tsis muaj kev sib txuas lus ib leeg.Yog hais tias qhov ntsuas tseem nyob ntawm qhov saturated chav, qhov yuam kev yuav loj dua.

Nyob rau hauv qhov tseeb ntau lawm, feem ntau cov neeg siv yuav xaiv siv thermal fais fab nroj tsuag rau centralized cua sov.Lub tshuab hluav taws xob superheated uas tsim los ntawm lub tshuab fais fab yog qhov kub thiab txias.Nws yuav tsum tau dhau los ntawm qhov chaw nres tsheb desuperheating thiab siab txo qhov system kom tig lub superheated chav rau hauv chav saturated ua ntej thauj mus rau cov neeg siv, superheated chav tsuas tuaj yeem tso cov cua sov uas muaj txiaj ntsig zoo tshaj plaws thaum nws txias rau lub xeev saturated.

Tom qab superheated chav yog thauj mus ntev, raws li kev ua haujlwm (xws li qhov kub thiab txias) hloov, thaum lub degree ntawm superheat tsis siab, qhov kub yuav txo qis vim cua sov poob, tso cai rau nws nkag mus rau hauv lub xeev saturated los yog supersaturated. lub xeev superheated, thiab ces hloov.ua saturated steam.

Vim li cas superheated chav yuav tsum tau txo kom saturated chav?
1.Superheated chav yuav tsum tau txias rau qhov kub thiab txias ua ntej nws tuaj yeem tso cov evaporation enthalpy.Lub tshav kub tso tawm los ntawm lub superheated chav txias rau qhov kub thiab txias yog heev me me piv nrog cov evaporation enthalpy.Yog tias lub superheat ntawm chav me me, qhov no ntawm cov cua sov yog qhov yooj yim tso tawm, tab sis yog tias lub superheat loj, lub sijhawm txias yuav ntev, thiab tsuas yog ib feem me me ntawm cov cua sov tuaj yeem tso tawm thaum lub sijhawm ntawd.Piv nrog rau cov evaporation enthalpy ntawm saturated chav, lub tshav kub tso tawm los ntawm superheated chav thaum txias rau saturation kub yog heev me me, uas yuav txo tau cov kev ua tau zoo ntawm cov khoom siv ntau lawm.

2.Sib txawv ntawm cov chav saturated, qhov kub ntawm superheated chav tsis paub tseeb.Superheated chav yuav tsum tau txias ua ntej nws tso cua sov, thaum saturated chav tsuas tso cua sov los ntawm theem hloov.Thaum cov cua kub tso tawm cua sov, qhov kub thiab txias yog tsim nyob rau hauv cov khoom siv sib hloov cua sov.gradient.Qhov tseem ceeb tshaj plaws hauv kev tsim khoom yog qhov ruaj khov ntawm chav kub.Steam stability yog qhov zoo rau kev tswj cua sov, vim tias kev hloov pauv kub feem ntau yog nyob ntawm qhov sib txawv ntawm qhov kub thiab txias, thiab qhov kub ntawm cov chav superheated yog qhov nyuaj rau stabilize, uas tsis zoo rau kev tswj cua sov.

3.Txawm hais tias qhov kub ntawm superheated chav nyob rau hauv tib lub siab yog ib txwm siab dua li ntawm saturated chav, nws lub peev xwm hloov hluav taws xob yog qis dua li ntawm cov saturated chav.Yog li ntawd, qhov ua tau zoo ntawm superheated chav yog qis dua li ntawm cov saturated chav thaum hloov hluav taws xob ntawm tib lub siab.

Yog li ntawd, thaum lub sij hawm ua hauj lwm ntawm cov cuab yeej, qhov zoo ntawm tig superheated chav rau saturated chav los ntawm lub desuperheater tshaj qhov tsis zoo.Nws qhov zoo tuaj yeem raug sau tseg raws li hauv qab no:

Lub tshav kub hloov coefficient ntawm saturated steam yog siab.Thaum lub sij hawm condensation txheej txheem, lub tshav kub hloov coefficient yog siab tshaj lub tshav kub hloov coefficient ntawm superheated chav los ntawm "superheating-heat transfer-cooling-saturation-condensation".

Vim nws qhov kub thiab txias, saturated chav kuj muaj ntau yam txiaj ntsig rau kev ua haujlwm ntawm cov khoom siv.Nws tuaj yeem txuag tau chav thiab muaj txiaj ntsig zoo los txo cov chav noj.Feem ntau, saturated steam yog siv rau kev sib pauv cua sov hauv kev tsim tshuaj.