Muaj peb txoj hauv kev ntawm kev hloov hluav taws xob: hluav taws xob hluav taws xob Q1, hloov hluav taws xob hloov hluav taws xob Q2 thiab hluav taws xob hloov hluav taws xob Q3. Ntawm lawv, thermal conduction yog hais txog cov cua kub hloov ntawm cov khoom nyob rau hauv kev sib cuag los ntawm thermal motion ntawm dawb electrons, molecules, atoms thiab lwm yam microscopic hais. Convection heat transfer yog hais txog kev sib txawv ntawm cov kua dej, ua rau kev sib nkag mus ntawm cov dej txias thiab kub kom ua tiav cov cua sov. Radiation heat transfer yog hais txog cov khoom nws tus kheej qhov kub thiab txias emitting electromagnetic vuag los yog photons hloov cov cua sov. Dab tsi yog qhov cuam tshuam rau thermal conductivity ntawminsulating refractory bricks?
Lub cev lub cev ntawm cov khoom siv rwb thaiv tsev feem ntau yog tsim los ntawm cov khoom theem thiab cov roj theem, yog li nws cov txheej txheem rwb thaiv tsev yog ze ze rau cov theem muaj pes tsawg leeg. Thaum tshav kub kub lub zog yog ua los ntawm qhov kub thiab txias mus rau qhov kub thiab txias. Ua ntej, tsuas muaj cov khoom theem kev coj ua. Thaum tshav kub lub zog dhau los ntawm cov pores nyob rau hauv cov khoom theem, muaj ob hom khoom theem conduction thiab roj theem conduction. Yog li ntawd, qhov ntev ntawm cov khoom theem conduction yog txuas ntxiv; thib ob, nws muaj feem xyuam rau thermal tawg. Thaum qhov kub thiab txias qis, qhov cuam tshuam ntawm thermal tawg ntawm lub rwb thaiv tsev nyhuv yog negligible thiab yuav tsis quav ntsej. Thaum qhov kub thiab txias, qhov conduction ntawm lub zog hluav taws xob yuav cuam tshuam los ntawm hluav taws xob, yog li ua lub luag haujlwm hauv kev rwb thaiv tsev kub.
Feem ntau, cov ntaub ntawv thermal rwb thaiv tsev yog cov ntaub ntawv multiphase, thiab txhua theem muaj nws tus kheej cov qauv. Yog li ntawd, cov thermal conductivity ntawm yog cuam tshuam los ntawm ntau yam xws li muaj pes tsawg leeg, cov ntsiab lus, thiab cov qauv sab hauv ntawm theem. Yog li ntawd, muaj ntau yam cuam tshuam rau lub thermal rwb thaiv tsev mechanism thiab nws thermal rwb thaiv tsev nyhuv. Lub thermal conductivity ntawm thermal insulating refractory bricks yog cuam tshuam los ntawm lub ntim ceev, porosity, theem muaj pes tsawg leeg, thiab lwm yam ntawm cov khoom.
(1) Pore loj: Tus naj npawb ntawm qhov pores thiab qhov loj ntawm qhov pores feem ntau nthuav tawm tib lub sijhawm. Nyob rau hauv lub premise ntawm ua kom tag nrho cov pores tsis hloov, txo qhov pore loj tuaj yeem ua rau kom cov pores, yog li txo cov thermal conductivity ntawm cov khoom; Thaum tus naj npawb ntawm qhov pores nce, qhov tshwj xeeb ntawm qhov chaw ntawm cov khoom siv thermal rwb thaiv tsev yuav nce, thiab cov hluav taws xob conductivity yuav txo.
(2) Volume density: Lub thermal conductivity ntawm cov khib nyiab yog siab dua li ntawm cov pa roj. Qhov txo qis hauv qhov ntim ceev txhais tau tias cov roj theem hauv cov khoom nce, yog li thermal conductivity txo. Txawm li cas los xij, thaum lub ntim ntim tsawg dhau lawm, cov roj theem hluav taws xob hloov pauv hauv cov khoom yuav raug txhim kho, thiab thermal conductivity yuav nce. Yog li ntawd, yog tias koj xav tau cov khoom siv thermal rwb thaiv tsev kom muaj kev ua haujlwm zoo thermal rwb thaiv tsev, qhov qis dua qhov ntim, qhov zoo dua. Ntawm qhov kub thiab txias, txhua yam khoom yuav muaj qhov tsim nyog thermal conductivity.
(3) Cov khoom muaj pes tsawg leeg: Cov emissivity ntawm thermal insulating refractory bricks muaj feem xyuam rau cov khoom, kub thiab particle loj. Yog li ntawd, nyob rau hauv lub thermal rwb thaiv tsev cov ntaub ntawv piv, koj muaj peev xwm tsim nyog nce los yog ntxiv Al2O3, MgO, CaO, ZnO thiab lwm yam Cheebtsam uas tsis muaj emissivity, thaum tsis txhob sib ntxiv ntawm kev hloov pauv oxides xws li Fe, Ni, Cr, thiab lwm yam.
