Quartz vs. Graphite Immersion Heaters: Qhov twg yog qhov zoo dua rau siab -Temperature Molten Salt Applications?

Nitrates, chlorides, thiab fluorides yog cov piv txwv ntawm siab -kub molten ntsev uas tau nrov dua rau kev siv xws li hnub ci thermal cia, siab - cov txheej txheem tshuaj kub, thiab cov tshuab hluav taws xob siab heev. Molten ntsev yog qhov zoo rau khaws cia lub zog thiab txav cua sov ib puag ncig, tab sis lawv kuj ua rau nws nyuaj rau cov khoom siv hauv cov cua sov immersion. Quartz thiab graphite yog ob qho piv txwv ntawm cov khoom tsis yog- hlau uas feem ntau siv los ua kom sov cov ntsev ntsev. Qhov no yog vim lawv ruaj khov ntawm qhov kub thiab txias thiab tsis corrode yooj yim. Tab sis txhua yam khoom muaj nws tus kheej qhov zoo thiab qhov tsis zoo thaum nws los txog rau hauv cov ntsev ntsev, tshwj xeeb tshaj yog thaum kub tshaj 500 degree. Peb yuav sib piv cov quartz thiab graphite immersion heaters nyob rau hauv no ncej raws li tej yam tseem ceeb xws li kub npaum li cas lawv tau txais, lawv ua hauj lwm nrog tshuaj zoo npaum li cas, lawv ua kom sov npaum li cas, lawv ntseeg tau npaum li cas, thiab cov nqi npaum li cas - lawv ua tau zoo.

Kev Tshawb Fawb Txog Lub Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hnyav
Kev siv cov ntsev molten raws li cov dej xa hluav taws xob ua rau muaj kev ntxhov siab ntau rau cov khoom siv cua sov. Cov ntsev no yuav kub heev, ntawm 500℃thiab 800 degree, thiab lawv yog cov corrosive heev thiab chemically reactive, tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej uas oxidising heev los yog heev txo. Nws yog ib qho tseem ceeb kom paub txog cov kev txwv ntawm cov ntaub ntawv xws li quartz thiab graphite raws li ntau thiab ntau lub zog cia khoom thiab kev ua tshuaj yuav tsum tau molten ntsev. Ob qho khoom siv yog qhov zoo rau cov khoom cua sov uas tsis yog hlau, tab sis lawv ua haujlwm sib txawv hauv qhov xwm txheej huab cua, xws li thaum qhov kub thiab txias siab heev los yog thaum muaj kev kub ntxhov ntawm cov ntsev ntsev.

Material Showdown: Saib ntawm Ntuj Cov Khoom Nyob Hauv Lub Tshuab Ntsuas
Thaum koj saib quartz thiab graphite ib sab, koj tuaj yeem pom tias lawv cov yam ntxwv ntuj tsim ua rau lawv zoo rau qhov sib txawv siab - kub siv.

Quartz: Quartz (SiO₂) yog cov tshuaj amorphous uas tsis muaj qhov pom tseeb. Nws melts ntawm txog 1,700℃thiab tsis oxidise zoo nyob rau hauv nruab nrab kub. Quartz tsis corrode yooj yim hauv oxidising chaw, tab sis nws tau softer ntawm qhov kub thiab txias, kwv yees li 1,000 degree. Quartz feem ntau yog siv nyob rau hauv cov xwm txheej uas nws zoo purity thiab tsis muaj reactivity tseem ceeb heev. Nws kuj ua haujlwm zoo nyob rau hauv nruab nrab cua sov thiab nyiam nyob rau hauv qhov chaw uas tsis tshua muaj kev sib kis tseem ceeb, suav nrog hauv cov khoom siv hluav taws xob thiab cov chaw muag tshuaj. Quartz tej zaum yuav muaj teeb meem nyob rau hauv cov chaw uas muaj cua sov heev thiab tshuaj reactivity vim nws tsis tuaj yeem tiv taus thermal shocks zoo heev thiab rhiab heev rau qee cov ntsev ntsev, tshwj xeeb tshaj yog cov tshuaj fluoride-raws li ntsev.

Graphite, ib tug crystalline daim ntawv ntawm carbon, muaj ib tug melting point ntawm txog 3,500 degree, uas yog heev loj dua li ntawm quartz. Nws kuj ua haujlwm zoo ntawm kev tiv thaiv qhov kub thiab txias. Nws yog qhov zoo dua ntawm kev ua cua sov dua li quartz (~ 1.4 W / m·K) vim tias nws muaj cov thermal conductivity ntau dua (~ 100-150 W / m·K). Qhov no yog vim li cas graphite yog qhov zoo rau qhov chaw uas cov cua sov yuav tsum tau txav mus sai. Tab sis graphite tsis muaj zog vim tias nws hnov ​​​​mob nrog oxygen ntawm qhov kub siab tshaj 450 degree, uas ua rau nws oxidise thiab poob kev ua haujlwm. Graphite ua haujlwm zoo tshaj plaws nyob rau hauv inert lossis txo cov cua, tab sis nws xav tau cov txheej txheem tiv thaiv lossis cov pa roj tsis zoo kom nyob ruaj khov nyob rau lub sijhawm thaum muaj cov pa oxygen lossis cov ntsev tawm tsam.

Kev ua yeeb yam hauv Molten Salt Arena: Kev Sib Tw ntawm Ntau Qib
Hom molten ntsev siv muaj qhov cuam tshuam loj npaum li cas quartz thiab graphite heaters ua haujlwm hauv kev siv ntsev molten.

Nitrate Molten Salts: Cov ntsev no yog oxidising heev thiab yog dav siv nyob rau hauv lub hnub ci thermal cia systems. Quartz ua haujlwm zoo nrog nitrate ntsev thiab yog cov khoom siv zoo tshaj plaws rau kev siv no. Nws nyob ruaj khov nyob rau hauv lub xub ntiag ntawm cov ntsev ntawm qhov kub txog li 800 degree. Tab sis thaum muaj cua sov ntau thiab ntau cov ntsev nitrate, quartz tuaj yeem tawg vim cov txheej txheem tshuaj uas ua rau cov silicates soluble. Graphite tuaj yeem tswj tau qhov kub thiab txias zoo, tab sis nws tsis zoo rau cov ntsev nitrate txij li thaum nws pib oxidise tshaj 450 degree, uas ua rau nws ua haujlwm ntev -.

Chloride thiab Carbonate Molten Salts: Cov ntsev no feem ntau yog siv rau hauv cov txheej txheem kev lag luam uas tshwm sim ntawm qhov kub thiab txias thiab tsis tshua muaj oxidise. Graphite yog qhov zoo rau cov kev siv no vim nws ua cua sov zoo thiab tsis tawg yooj yim hauv ib puag ncig uas tsis muaj zog lossis txo qis. Nws ua haujlwm zoo txawm tias qhov kub siab tshaj 600 degree, uas yog thaum quartz yuav pib poob nws qhov kev ruaj ntseg. Tab sis graphite xav tau cov txheej tiv thaiv kom tsis txhob oxidizing thaum nws los rau hauv kev sib cuag nrog oxygen. Cov txheej txheem no tuaj yeem ua rau kev ua haujlwm nyuaj thiab kim.

Fluoride Molten Salts: Cov ntsev nrog fluoride nyob rau hauv lawv yog corrosive heev rau quartz thiab graphite. Fluoride ions ua rau ob qho tib si cov ntaub ntawv sai heev, ua rau lawv tawg thiab ua tsis tiav. Fluoride corrosion yog qhov phem heev rau quartz, tab sis graphite kuj ntxeem tau thiab tuaj yeem nqus cov ions tsis zoo, ua rau nws tsis zoo. Nyob rau hauv cov kev mob siab no, ob qho tib si cov ntaub ntawv xav tau kev tiv thaiv ntxiv, nrog rau cov coatings tshwj xeeb lossis alloys uas muaj zog tiv thaiv fluoride ions.

Kev Ua Lag Luam-Off Table: Ib Daim Ntawv Teev Npe ntawm Yam Tseem Ceeb Yuav Xav Txog Thaum Txiav Txim Siab
Factor hauv Kev Txiav Txim Siab

Cua sov nrog Quartz

Heater rau Graphite

Qhov kub siab tshaj plaws uas nws tuaj yeem ua haujlwm

Siab (nyob ib ncig ntawm 1000 degree)

Very high (>1500℃hauv qhov chaw nrog me me lossis tsis muaj oxygen)

Thermal conductivity

Tsawg (ze li 1.4 W / m·K)

Siab (kwv yees 100-150 W / m·K)

Compatibility nrog ib puag ncig oxidizing

Zoo heev

Phem (xav tau kev tiv thaiv tshaj 450 degree)

Compatibility nrog ib tug tsawg polluted ib puag ncig

Zoo

Zoo heev

Resistance rau thermal shock

Nruab nrab (rhiab heev rau kev hloov pauv ceev hauv qhov kub thiab txias)

Zoo heev (vim tias nws muaj cov conductivity zoo thiab hloov tau)

Purity ntawm cov khoom thiab kev pheej hmoo ntawm kev kis kab mob

Siab heev, tsis muaj hlau paug

Nruab nrab, tuaj yeem poob ntawm cov pa roj carbon

Tus nqi nruab nrab

Siab heev

Siab mus rau siab heev, nyob ntawm qib ntawm graphite thiab nws tau ua li cas.

Qhov zoo tshaj plaws hom Molten ntsev

Nitrates thiab qee cov chlorides uas qis dua hauv qhov kub thiab txias

Chlorides thiab carbonates uas ruaj khov ntawm qhov kub thiab txias (nrog ib puag ncig tiv thaiv)

Kev Xaiv: Cov ntsev thiab qhov kub thiab txias yog qhov tseem ceeb
Muaj ob peb yam tseem ceeb uas yuav tsum xav txog thaum xaiv ntawm quartz thiab graphite immersion heaters.

Tshawb xyuas seb cov ntsev molten yog ua los ntawm thiab cov cua zoo li cas nyob rau hauv. Rau oxidising tej yam kev mob xws li nitrate ntsev, siv quartz. Txhawm rau txo cov xwm txheej zoo li chlorides thiab carbonates, siv graphite.

Tshawb xyuas qhov ntsuas kub ua haujlwm: Graphite yog qhov kev xaiv zoo dua yog tias qhov kub nyob qis dua 800℃vim nws muaj thermal conductivity zoo dua thiab tuaj yeem tswj tau qhov kub thiab txias.

Tshawb xyuas qhov nyuaj ntawm lub cev: Yog tias koj lub cev raug cov pa oxygen lossis cov tshuaj hnyav, graphite yuav xav tau cov txheej txheem tiv thaiv nyuaj dua lossis cov cua tsis zoo, uas yuav ua rau lub kaw lus kim dua thiab nyuaj.

Tham nrog cov kws tshaj lij: Yog tias koj siv kev txiav- ntug lossis cov ntsev sib xyaw ua ke, nws yog ib lub tswv yim zoo los sim qhov sib xyaw ntawm koj cov ntaub ntawv nrog koj tus neeg muag khoom kom paub tseeb tias koj lub cev siv sijhawm ntev.

Xaus: Ob qhov kev sib tw rau thaj chaw sib txawv ntawm qhov siab heev
Hauv kev xaus, ob qho tib si graphite thiab quartz yog lwm txoj hauv kev zoo rau kev siv siab -kub molten ntsev. Txawm li cas los xij, lawv qhov kev ua tau zoo thiab qhov tsis zoo yog nyob ntawm qhov kub thiab txias ib puag ncig. Quartz yog qhov zoo tshaj plaws rau cov xwm txheej uas oxidising ntawm nruab nrab kub, thaum graphite yog qhov zoo tshaj plaws rau cov chaw nyob uas txo qhov kub siab. Kev xaiv qhov yog nyob ntawm kev paub txog cov kev xav tau tshwj xeeb ntawm koj qhov chaw ntsev ntsev thiab qhov ntev - lub sij hawm thermal, tshuaj, thiab cov khoom siv kho tshuab nws xav tau.