Q: Yuav ua li cas kom paub qhov txawv ntawm cov saturated steam thiab superheated chav?

A:

Cias muab, lub tshuab hluav taws xob yog lub boiler uas muaj cua sov rau ib qho twg los tsim cov chav kub kub. Cov neeg siv tuaj yeem siv chav rau kev tsim khoom lossis cua sov raws li xav tau.

Chav generators yog tus nqi qis thiab siv tau yooj yim. Tshwj xeeb, cov tshuab hluav taws xob roj thiab cov tshuab hluav taws xob hluav taws xob uas siv lub zog huv yog huv thiab tsis muaj kuab paug.

Thaum cov kua evaporates nyob rau hauv ib qho chaw kaw, cov kua molecules nkag mus rau qhov chaw saum toj no los ntawm cov kua nto thiab ua vapor molecules. Txij li cov chav dej molecules nyob rau hauv chaotic thermal motion, lawv sib tsoo nrog ib leeg, lub thawv phab ntsa thiab cov kua nto. Thaum sib tsoo nrog cov kua saum npoo, qee cov molecules tau nyiam los ntawm cov kua molecules thiab rov qab mus rau cov kua ua kua molecules. . Thaum evaporation pib, tus naj npawb ntawm cov molecules nkag mus rau qhov chaw yog ntau dua li cov molecules rov qab mus rau cov kua. Raws li evaporation txuas ntxiv, qhov ceev ntawm vapor molecules nyob rau hauv qhov chaw tseem nce ntxiv, yog li tus naj npawb ntawm cov molecules rov qab mus rau cov kua kuj nce ntxiv. Thaum tus naj npawb ntawm cov molecules nkag mus rau qhov chaw hauv ib chav tsev lub sij hawm sib npaug ntawm cov molecules rov qab mus rau cov kua, evaporation thiab condensation nyob rau hauv lub xeev ntawm dynamic equilibrium. Lub sijhawm no, txawm hais tias evaporation thiab condensation tseem tab tom ua, qhov ntom ntawm vapor molecules hauv qhov chaw tsis nce ntxiv lawm. Lub xeev nyob rau lub sijhawm no hu ua saturation state. Cov kua hauv lub xeev saturated hu ua kua saturated, thiab nws cov vapor hu ua qhuav saturated steam (tseem hu ua saturated steam).

Yog tias tus neeg siv xav ua kom tiav qhov ntsuas thiab ntsuas qhov tseeb dua, nws raug nquahu kom kho nws li superheated chav thiab them nyiaj rau qhov kub thiab txias. Txawm li cas los xij, xav txog cov teeb meem nqi, cov neeg siv khoom kuj tuaj yeem them nyiaj rau qhov kub thiab txias xwb. Qhov zoo tshaj plaws saturated steam lub xeev yog hais txog ib qho kev sib raug zoo ntawm qhov kub, siab thiab chav ceev. Yog tias ib qho ntawm lawv paub, qhov thib ob qhov tseem ceeb raug kho. Cov chav nrog qhov kev sib raug zoo no yog saturated chav, txwv tsis pub nws tuaj yeem suav tias yog superheated chav rau kev ntsuas. Nyob rau hauv kev xyaum, qhov kub ntawm superheated chav yuav siab dua, thiab lub siab yog feem ntau kuj tsis tshua muaj (ntau saturated chav), 0.7MPa, 200 ° C chav zoo li no, thiab nws yog superheated chav.

Txij li thaum lub tshuab hluav taws xob yog lub tshuab hluav taws xob siv hluav taws xob siv kom tau txais cov chav ua haujlwm zoo, nws muab cov chav tsim los ntawm ob txheej txheem, uas yog saturated steam thiab superheated steam. Qee tus neeg yuav nug, qhov txawv ntawm qhov saturated steam thiab superheated chav nyob hauv lub tshuab hluav taws xob yog dab tsi? Niaj hnub no, Nobeth yuav tham nrog koj txog qhov sib txawv ntawm cov chav saturated thiab superheated chav.

1. Saturated steam thiab superheated chav muaj qhov sib txawv ntawm qhov kub thiab txias.
Saturated steam yog chav tau ncaj qha los ntawm cov dej cua sov. Qhov kub, siab, thiab qhov ntom ntom ntawm cov saturated chav sib txuas ib mus rau ib qho. Lub chav kub nyob rau hauv tib lub atmospheric siab yog 100 ° C. Yog xav tau qhov kub thiab txias ntau dua, tsuas yog ua kom lub zog siab.
Superheated chav yog reheated nyob rau hauv lub hauv paus ntawm saturated chav, uas yog, chav ua los ntawm theem nrab cua sov.Superheated chav yog saturated vapor siab uas tseem unchanged, tab sis nws kub nce thiab nws ntim nce.

2. Saturated steam thiab superheated chav muaj kev siv sib txawv
Superheated chav feem ntau yog siv nyob rau hauv thermal fais fab nroj tsuag los tsav chav turbines los tsim hluav taws xob.
Saturated steam feem ntau yog siv rau cov khoom siv cua sov lossis kev sib pauv cua sov.

3. Lub tshav kub pauv efficiency ntawm saturated chav thiab superheated chav yog txawv.
Lub tshav kub hloov efficiency ntawm superheated chav yog qis dua li ntawm saturated chav.
Yog li ntawd, thaum lub sij hawm tsim khoom, lub superheated chav yuav tsum tau hloov dua siab tshiab rau hauv saturated chav los ntawm ib tug kub txo thiab siab reducer rau rov qab siv.
Lub installation txoj hauj lwm ntawm lub desuperheater thiab siab reducer yog feem ntau nyob rau hauv pem hauv ntej kawg ntawm lub chav-siv cov khoom thiab qhov kawg ntawm lub tog raj kheej. Nws tuaj yeem muab saturated chav rau ib leeg lossis ntau chav siv khoom siv thiab txhim kho kev tsim khoom.