1. Contraction thiab expansion ntawm refractories castables
Thaum thawj txheej txheem cua sov,refractory castablesyuav ntsws ob zaug hauv ntim thaum lub cev qhuav dej ntawm 50 degree -200 degree thiab sintering ntawm 900 degree -1000 degree . Hauv lwm qhov ntsuas kub, cua sov yuav ua rau cov castable nthuav dav. Tom qab thawj cov cua sov, cov castable feem ntau tsis shrinks.
Txhawm rau tiv thaiv qhov kev ntxhov siab los ntawm kev hloov pauv los ntawm kev puas tsuaj rau cov castable, cov hauv ob sab phlu yuav tsum tau muab faib rau hauv cov cheeb tsam me me uas muaj kab pheeb ces kaum ntawm qhov ntev tsis pub tshaj 1.5m, thiab hauv ob sab phlu yuav tsum tau cam khwb cia rau hauv seem thiab tawm qhov khoob rau kev nthuav dav thiab kev cog lus ntawm thaj tsam ntawm txhua qhov chaw casting.
2. Kev cuam tshuam ntau yam ntawm cov pob qij txha expansion
The size of the gap should ensure the free expansion of refractory castables in each section, and the expansion joints in the right position can also become control joints. In the high temperature section (>600 degree), qhov dav ntawm qhov sib koom ua ke yuav tsum tau tswj ntawm 3-4mm raws li qhov sib nrug ntawm cov pob qij txha expansion. Kev nthuav dav cov pob qij txha thiab kev tswj cov pob qij txha tau teem rau ntawm lub dav hlau txog 200 hli ntawm lub kaum sab xis, tsis yog muab tso rau ntawm lub kaum sab xis thiab lub taub hau. Kev sib tsoo ntawm cov castables ntawm ob sab ntawm kev nthuav dav sib koom ua ke thiab kev tswj kev sib koom ua ke yog qhov loj, thiab qhov ceev ntawm cov ntsia hlau tuaj yeem tsim nyog ntxiv.
3. Dav tswj cov pob qij txha expansion
Qhov dav ntawm kev nthuav dav sib koom ua ke yog cuam tshuam nrog kev ua haujlwm kub thiab qhov ntev ntawm cov kab tswj. Thaum qhov kub thiab txias thiab tswj qhov ntev yog qhov ntev, qhov sib koom ua ke tuaj yeem nthuav dav kom tsim nyog. Hauv thaj chaw uas muaj qhov kub thiab txias (<400℃), the castables can be used directly on the equipment shell without insulation. Under such conditions, inserting 2mm thick cardboard or plastic film every 1.5m can meet the requirements of the expansion space.
4. Kev ua kom zoo ntawm qhov chaw ntawm kev nthuav dav sib koom ua ke
Thaum txiav txim siab txoj haujlwm nthuav dav, qhov kev tsim nyog ntawm cov txheej txheem vibration yuav tsum tau txiav txim siab tib lub sijhawm. Kev vibration ntawm refractory castables ntawm ib sab ntawm qhov sib txawv yuav tsum tsis txhob cuam tshuam rau cov castable uas tau nchuav thiab vibrated thiab tau pib harden pib. Qhov chaw ntawm qhov kev nthuav dav sib koom ua ke zam qhov kev ntxhov siab-kev coj tus kheej, lub qhov ntawm lub cub tawg thiab hauv ob sab phlu. Nyob rau hauv cov cheeb tsam uas muaj cov duab complex, xws li cov ces kaum, convexities, thiab lwm yam, expansion pob qij txha yoog raws li lawv qhov chaw yuav tsum tau teem rau ntawm convex cov ces kaum thiab nkhaus nto nrog me me curvature vojvoog. Thaum ob qhov chaw casting sib tshuam los ua lub kaum sab xis, L-shaped expansion sib koom ua ke yuav tsum tau teem rau ntawm lub kaum sab xis.
Daim duab hauv ob sab phlu yuav tsum qhia qhov chaw thiab qhov loj ntawm cov pob qij txha nthuav dav hauv cov khoom tseem ceeb. Yog tias qhov ntsuas kub ntawm cov khoom siv casting ntau tshaj 1200 degree, ib qho kev sib txuas nrog qhov dav ntawm ntau tshaj 3 hli yuav tsum tau teeb tsa, thiab daim pam fiber ntau yuav tsum muab tso rau hauv nws.
5. Kev teeb tsa kev tswj cov pob qij txha
Casting cov ntaub ntawv yuav ua rau tawg vim shrinkage, yog li kev tswj cov pob qij txha yuav tsum tau teem rau ntawm li 200 hli ntawm convex ces kaum, kom shrinkage tawg yuav tshwm sim nyob rau hauv predetermined thiab muaj kev ruaj ntseg qhov chaw. Kev teeb tsa ntawm kev tswj cov pob qij txha tuaj yeem ua tiav los ntawm kev ntxig cov ntawv, paraffin lossis nyias ntoo boards nyob rau hauv qhov kev txiav txim siab, thiab cov ntaub ntawv pov thawj uas yog nplaim taws los yog ntws hauv qhov kub thiab txias. Tom qab cov khoom siv hluav taws kub tau kub hnyiab los yog ntws, tswj cov pob qij txha sab laug.
Kev tswj kev sib koom ua ke yuav tsum tau muab tso rau hauv nruab nrab ntawm cov ntsia hlau uas nyob ib sab, thiab qhov kev ncua deb ntawm cov ntsia hlau ntawm ob sab yog sib npaug. Nws yuav tsum tau teem rau ntawm qhov nruam nkhaus, conical nto thiab cov kav dej, thiab yuav tsum tau teem rau ntawm qhov chaw tiaj tus thiab nkhaus qhov chaw uas qhov kev pheej hmoo ntawm shrinkage tsis tuaj yeem tswj tau. Nws yuav tsum raug zam kom muab tso rau hauv qhov chaw uas cov pob qij txha tsis tuaj yeem teeb tsa, xws li teeb tsa cov pob qij txha ntawm cov pob zeb me me thiab cov kaum sab xis.
