Kev lag luam cua sov txuas ntxiv tshaj cov kua, hlau, thiab cua. Qee cov ntawv thov uas xav tau tshaj plaws suav nrog cov cua sov ib nrab- cov khoom siv los yog cov ntaub ntawv zoo li av, asphalt, cov khoom siv waxes, lossis cov yas hauv extrusion chim. Xav txog qhov yuav tsum tau tswj qhov kub thiab txias hauv asphalt cia tank los tiv thaiv kev ua kom khov, lossis kom sov cov av hauv cov txheej txheem bioremediation rau kev ua kom pom cov microbial. Cov xwm txheej no nthuav tawm cov kev sib tw tshwj xeeb ntawm kev sib cuag tsis zoo, qhov chaw tsis zoo, thiab qhov kub thiab txias, qhov twg cov txheej txheem cua sov ua haujlwm luv luv.
Cua sov av, xuab zeb, los yog lwm yam granular xov xwm nrog ib tug cartridge tso cua sov yog ib ce nyob rau hauv kev tswj tsis zoo thermal conductivity thiab mechanical stress. Cov xov xwm tsis ntws zoo li cov kua, ua kom zoo sib xws nrog lub tshuab cua sov sheath nyuaj. Thaum tshav kub kub hloov pauv tsis muaj txiaj ntsig, feem ntau ua rau lub hauv paus overheating ntawm lub sheath yog tias qhov watt ceev yog siab dhau. Tsis tas li ntawd, av tuaj yeem ua rau abrasive thiab tuaj yeem muaj cov dej noo uas tig mus rau chav, ua rau thermal shock. Rau cov ntawv thov zoo li no, qhov tsawg watt ceev yog qhov pib universal. Cov ntaub ntawv sheath feem ntau xaiv rau kev puas tsuaj, xws li carbon steel lossis tshwj xeeb coated steels, ntxiv rau corrosion kuj. Cov cua sov tuaj yeem muab tso rau hauv cov kav dej tiv thaiv lossis lub tes tsho los pab txhawb kev txij nkawm, txawm tias qhov no ntxiv ib qho kev tiv thaiv thermal ntxiv.
Cov khoom siv cua sov xws li bitumen (asphalt), roj roj hnyav, lossis cov khoom siv waxes sib piv nrog cov kua cua sov tab sis muaj qhov sib txawv tseem ceeb. Cov ntaub ntawv no feem ntau yog viscous heev ntawm ambient kub thiab yuav solidify tag nrho. Cartridge heaters siv ntawm no yuav tsum muaj zog txaus los tswj cov thermal stresses thaum pib-nce los ntawm qhov txias, khov. Kev ncig, thaum ua tau, muaj txiaj ntsig zoo heev. Cov cua sov feem ntau yog ntsia rau hauv "pocket" lossis qhov zoo uas yog ib feem ntawm lub voj voog ncig. Watt ceev yuav tsum tau ua tib zoo tswj kom tsis txhob tawg los yog coking ntawm cov khoom ntawm kub sheath nto. Qee qhov xwm txheej, qhov qis -wattage "trace heating" system yog siv nyob rau hauv cov kav dej kom yooj yim tswj qhov kub thiab txias, thaum siab dua -cov cua kub ceev yog siv nyob rau hauv lub tank loj rau cua sov- nce.
Lwm daim ntawv thov tshwj xeeb yog nyob rau hauv yas extrusion. Cartridge heaters yog ntom ntom ntim rau hauv cov thoob ntawm extruders kom yaj thiab tswj qhov kub ntawm cov yas resin. This is an extreme combination of high temperature, high power density, and constant physical pressure from the tightly packed heaters in the barrel holes. Sheath khoom lub zog thiab meej diameters yog qhov tseem ceeb. Cov cua sov feem ntau tau nruab rau hauv cov cheeb tsam kom tso cai rau qhov kub thiab txias profileing raws lub thoob qhov ntev. MgO rwb thaiv tsev yuav tsum yog qhov zoo tshaj plaws compaction kom tiv taus lub cev kev co thiab siab.
Thoob plaws cov ntawv thov "tshwj xeeb tshaj tawm" ntau yam no, ntau cov xov xwm tshwm sim. Ua ntej, nkag siab txog cov khoom siv thermal (cov cua kub tshwj xeeb, thermal conductivity, theem hloov cov ntsiab lus) yog qhov tseem ceeb rau kev suav cov cua sov. Thib ob, lees paub cov yam ntxwv ntawm lub cev (abrasiveness, viscosity, expansion / contraction) qhia cov ntaub ntawv sheath thiab mechanical design xaiv. Thaum kawg, cov haujlwm ua haujlwm xws li pib- nce cov xwm txheej, qhov xav tau cua sov- lub sijhawm nce, thiab cov tswv yim tswj yuav tsum raug suav nrog.
Cov no tsis yog daim ntawv thov rau kev sim thiab ua yuam kev. Lub tshuab cua sov ua tsis tiav hauv lub tank asphalt tuaj yeem ua rau muaj kev sib koom ua ke tag nrho, yuav tsum muaj hnub ntawm kev kho tus nqi. Yog li ntawd, ib tug systematic engineering mus kom ze yog yuav tsum tau. Muab cov khoom siv hluav taws xob tso rau hauv lub tshuab cua sov kom paub meej ntau li ntau tau txog kev tshaj tawm, lub thawv tsim, thiab cov hom phiaj txheej txheem tso cai rau kev txhim kho cov kev daws teeb meem zoo. Qhov no yuav koom nrog kev cai sheath alloys, tshwj xeeb lub davhlau ya nyob twg tsim, lossis cov lus pom zoo rau kev teeb tsa tshwj xeeb. Rau kev sib tw cua sov ua hauj lwm nrog atypical xov xwm, leveraging daim ntawv thov kev txawj ntse ntawm ib tug tshwj xeeb chaw tsim tshuaj paus yog lub feem ntau txhim khu kev qha lub tswv yim los xyuas kom meej kev ua hauj lwm txuas ntxiv thiab kev ruaj ntseg system.
