Yuav Ua Li Cas Phab Ntsa Thickness ntawm 316 Stainless Hlau Sheath hloov qhov siab tshaj plaws tso cai Watt ceev hauv cov txheej txheem hluav taws xob cua sov?
Tso lus
The correlation between sheath wall thickness and surface watt density is rarely taught as a combined design concept for process engineers charged with designing electric immersion heaters for corrosive chemical solutions. Hloov chaw, phab ntsa tuab feem ntau txiav txim siab los ntawm txoj cai tswj hwm ntawm tus ntiv tes xoo thiab watt ntom ntom yog coj los ntawm cov kab kos sib txawv nyob ntawm cov kua hom thiab qhov kub thiab txias. Qhov no ua rau ib qho kev ua kom zoo tshaj plaws uas ua rau muaj kev saib xyuas ntau dhau (tshaj - cov cua sov loj nrog ntau qhov chaw) lossis ua tsis tiav ntxov vim muaj cua sov sab hauv. Lub thermal tsis kam ntawm 316 stainless hlau sheath nws tus kheej yog qhov txuas uas ploj lawm. Txij li txhua millimeter ntawm phab ntsa tuab cuam tshuam nrog kev xa hluav taws xob los ntawm cov xaim hluav taws xob sab hauv mus rau cov txheej txheem cov kua dej, tib lub watt ntom ntom uas tau txais tag nrho rau cov nyias nyias-walled sheath yuav ua rau muaj kev puas tsuaj sai hauv cov tuab- phab ntsa tsim. Kab lus no muab ntau lub hauv paus rau derating watt ceev raws li kev ua haujlwm ntawm 316 sheath phab ntsa tuab thiab ua rau cov kws ua haujlwm qhia cov cua sov rau ob qho tib si xav tau lub zog tso tawm thiab kwv yees lub neej kev pab cuam.
Thermal Resistance ntawm 316 Sheath raws li qhov txwv tsis pub muaj zog ceev
Qhov kev txwv tsis pub siv tau watt ntom ntom ntawm cov hluav taws xob cua sov yog siv tau los ntawm qhov ntsuas kub ntawm cov nickel sab hauv -chromium kuj hlau. Cov hlau yuav tsum tau khaws cia hauv qab nws qhov pib oxidation, uas feem ntau yog nyob nruab nrab ntawm 800℃thiab 900℃rau kev ua haujlwm tas mus li, nyob ntawm cov alloy muaj pes tsawg leeg, thiab magnesium oxide rwb thaiv tsev nyob ib puag ncig yuav tsum khaws nws lub zog dielectric, uas pib poob ntawm ib ncig ntawm 450 degree. Cov hlau tsis kam thiab cov cua sov nruab nrab muaj peb thermal resistances hauv series. Cov kev tawm tsam no yog MgO insulating txheej, phab ntsa ntawm 316 stainless hlau sheath, thiab cov dej ciam teb rau sab nraud ntawm lub sheath. Ntawm qhov tsawg watt ntom ntom, huv si, qis - cov kua dej viscosity nrog qis qis feem ntau muaj qhov tseem ceeb ntawm cov dej ciam teb. Tab sis nrog cov watt ntau dua los yog cov dej tsis zoo, qhov kev tiv thaiv ntawm phab ntsa sheath ua qhov tseem ceeb dua. Thermal conductivity ntawm ib ncig ntawm 15 W / m·K ntawm 100℃thiab txog 18 W / m·K ntawm 400℃rau 316 sheath tau txais. Xws li cov conductivity tsawg txhais tau hais tias thermal kuj ntawm 0.0001 m 2 K / W rau ib cheeb tsam ntawm 1.5 hli tuab phab ntsa. Tus nqi no zoo nkaus li me ntsis tab sis qhov kub thiab txias poob ntawm phab ntsa sheath yog qhov kev tiv thaiv lub sij hawm thaum tshav kub kub flux. Ntawm 10 W / cm² (100,000 W / m²) 1.5 mm 316 sheath yuav muaj qhov sib txawv ntawm qhov kub ntawm li 10℃los ntawm sab hauv mus rau sab nrauv. Tib phab ntsa ntawm 20 W / cm2 muab qhov poob ntawm 20 degree. Qhov poob ntawm 30 W / cm^{2} yog 30^{\\circ}C. Xws li cov nuj nqis tsis cuam tshuam thaum cov hlau sab hauv twb ua haujlwm nyob ze nws qhov siab tshaj qhov nkag tau.
Thicker sheaths yuav tsum derating ntawm watt ceev - quantification.
Rau cov txheej txheem kub thiab dej txias, qhov nce ntawm cov phab ntsa ntawm phab ntsa yuav tsum muaj qhov sib npaug ntawm cov watt ntom ntom kom tswj tau qhov kub ntawm cov hlau sab hauv. Rau me me thickness ranges kev sib txuas yog kwv yees li linear. Xav txog 316 sheath nrog phab ntsa tuab ntawm 1.0 hli ua haujlwm tau zoo ntawm 15 W / cm² hauv 90℃dej da dej nrog cov hlau sab hauv ntawm 700 degree. Tag nrho qhov kub sib txawv ntawm hlau mus rau dej yog 610 degree. Qhov kev poob no yog nyob ntawm qhov kev txiav txim ntawm 15℃hauv cov phab ntsa sheath, txog 100℃hauv MgO rwb thaiv tsev thiab txog 495℃hauv cov dej ciam teb. Nrog rau cov phab ntsa thickness ob npaug rau 2.0 hli, qhov kub sib txawv ntawm phab ntsa yog nyob ib ncig ntawm 30℃rau tib lub tshav kub flux. Qhov ntsuas kub tag nrho yuav tsum yog 610℃kom rov qab cov hlau sab hauv mus rau 700 degree. MgO poob yog qhov tsis tu ncua thiab qhov poob hauv cov dej ciam txheej yog tswj hwm los ntawm cov txheej txheem tsis ua haujlwm. Lub tshav kub khiav yog qhov sib txawv xwb. Lub sheath phab ntsa poob rov qab mus rau 15 degree, yog li rov ua qhov qub hlau kub, los ntawm kev txo cov watt ntom ntawm 15 W / cm 2 txog li 13.5 W / cm 2 . Qhov no yog 10% derating rau 1.0 hli nce phab ntsa thickness. Rau kev txhoj puab heev ntawm 1.0 hli mus rau 2.5 hli, qhov yuav tsum tau derating yog nyob ib ncig ntawm 18%. Kev suav tau ua nrog cov khoom ua kua dej tas li. Qhov tseeb, thicker sheaths kuj cuam tshuam rau cov dej ciam txheej los ntawm kev txo qis sab nraud rau ib txoj kab uas hla. Txawm li cas los xij, cov nyhuv dominating tseem yog cov hluav taws xob ntau dua ntawm cov phab ntsa hlau.
Kev Tshawb Fawb Kev Tshawb Fawb Txog Kev cuam tshuam ntawm Phab Ntsa Thickness ntawm Cov Cuab Yeej Lub Neej
Kev pom zoo ntawm qhov kev sib raug zoo ntawm kev sib raug zoo yog tau los ntawm kev tswj xyuas lub neej ceev ntawm 316 encased immersion heaters. Cov khoom siv hluav taws xob zoo sib xws nrog cov phab ntsa tuab ntawm 1.2 hli, 1.6 hli thiab 2.0 hli tau ua haujlwm ntawm qhov ceev ntawm 12 W / cm2 hauv 95℃circulating dej voj hauv kev tshawb fawb. Tag nrho cov tshuab cua sov tau tsim nrog qhov zoo tib yam hauv cov hlau tsis sib xws, MgO compaction ntom, thiab txheej txheem fabrication. Cov cua sov encased 1.2 hli nyob rau hauv txoj kab uas hla mus txog lub sij hawm tsis ua hauj lwm ntawm 18,000 teev, tsis ua hauj lwm txhais tau tias yog qhib Circuit Court ntawm cov hlau tsis kam los yog rwb thaiv tsev tsis zoo hauv qab 1 megohm. Lub 1.6 hli encased cua sov ua tsis tau tejyam ntawm qhov nruab nrab ntawm 11,500 teev uas yog ib tug 36% poob rau hauv lub neej ncua rau tib watt ceev thiab cov txheej txheem tej yam kev mob. Lub 2.0 hli sheathed heaters tsuas yog siv sijhawm 7,200 teev, 60% poob hauv lub neej dhau ntawm pawg phab ntsa thinnest. Thermocouple measurements inside the MgO layer during testing showed that at equal watt density, internal wire temperatures of 2.0 mm sheath heaters were some 55℃above those of the 1.2 mm units. Qhov kub siab nrawm nrawm rau oxidation ntawm hlau thiab poob ntawm kev tiv thaiv ntawm MgO. Thaum qhov kev sim tau ua nrog cov watt ntom derated raws li cov kab sib txuas tau pom ua ntej, 10.5 W / cm2 rau 1.6 mm pawg thiab 9.5 W / cm2 rau 2.0 mm pawg, tag nrho peb pawg ua tiav qhov sib piv ntev ntawm 16,000 txog 18,000 teev. Qhov no qhia tau hais tias phab ntsa thickness tsis tas yuav txo lub cua sov lub neej, tab sis qhov tsis ua hauj lwm derate watt ceev kom zoo thaum thov cov phab ntsa tuab yog qhov ua rau ua tsis tiav ntxov ntxov.
Standard 316 Sheath Thicknesses thiab Watt Density txwv los ntawm daim ntawv thov
Cov lus hauv qab no qhia tau hais tias qhov siab tshaj plaws watt ceev qhov tseem ceeb rau immersion heaters clad nyob rau hauv 316 stainless hlau thiab siv nyob rau hauv cov txheej txheem raug kua. Cov no yog cov lus qhia rau kev ua haujlwm tas mus li, cov kua dej nruab nrab (Reynolds tus lej saum toj 4,000), thiab qhov xav tau sab hauv hlau kub ntawm 750℃max. Rau stagnant los yog siab viscosity xov xwm ntxiv derating ntawm 20-30% yog pom zoo.
Txheej Txheem Dej & Qhov Kub Kub 316 Sheath Phab Ntsa Thickness 0.8-1.0 mm 316 Sheath Phab Ntsa Thickness 1.2-1.5 mm 316 Sheath Phab Ntsa Thickness 1.6-2.0 mm 316 Sheath Phab Ntsa Thickness 2.2-2.5 mm
Demineralised dej, 20–60℃18 W/cm2 15 W/cm2 12 W/cm2 10 W/cm2
Demineralised dej 60-95℃15 W/cm2 12 W/cm2 10 W/cm2 8 W/cm2
Lub teeb roj (ISO VG 32), 40-80℃12 W / cm² 10 W / cm² 8 W / cm² 6.5 W / cm²
Cov roj hnyav (ISO VG 220), 80-120℃8 W/cm2 6.5 W/cm2 5.5 W/cm2 4.5 W/cm2
Dilute acid los yog alkaline tov, 50-80℃10 W/cm2 8.5 W/cm2 7 W/cm2 5.5 W/cm2
Tsis tshua muaj dej ntws (stagnant dej / tank fab) 8 W / cm² 6.5 W / cm² 5 W / cm² 4 W / cm²
Cov txiaj ntsig no muaj kev nyab xeeb kev ua haujlwm tsis tu ncua rau cov qauv siv hluav taws xob ib txwm muaj. Yog tias cov lus pom zoo no dhau lawm, chav tsev yuav tsis poob tam sim ntawd, tab sis nws lub neej kev pabcuam yuav raug txo qis. Vim qhov kev sib raug zoo ntawm cov hlau kub thiab oxidation tus nqi, lub neej ntawm lub rhaub feem ntau txo los ntawm 30-40% nrog rau qhov nce ntawm watt ceev los ntawm 10% los ntawm tus nqi txais.
High Power Output vs. Phab ntsa tuab
Rau cov ntawv thov uas xav tau cov tshuab ua haujlwm ntev ntawm cov phab ntsa tuab 316 sheath thiab cov khoom siv hluav taws xob siab muaj peb txoj hauv kev tsim kho kom rov zoo li qhov tsis sib haum xeeb. Thawj, txoj kev yooj yim tshaj plaws yog ua kom lub rhawv ntev ntawm lub caij thiab ua kom lub zog tag nrho tsis tu ncua. Tag nrho wattage tuaj yeem zoo ib yam nrog rau qhov ntev ntawm ob zaug ntev li ntawm ib nrab ntawm watt ntom. Qhov no ua rau cov phab ntsa tuab rau kev tiv thaiv kev tiv thaiv thiab sab hauv cov hlau kub hauv qab qhov kev pom zoo. Kev lag luam tawm -tawm yog qhov loj dua qhov nkag ntawm lub nkoj thiab tej zaum yuav muaj nqi ntau dua. Qhov thib ob txoj kev yog los txhim kho cov kua dej ntws tawm ntawm lub rhaub dej. Qhov kev tiv thaiv ntawm cov dej ciam teb tuaj yeem raug txo los ntawm ib qho ntawm ob mus rau peb los ntawm kev quab yuam kev ncig, uas ua rau txo qis qhov kub ntawm sab nraud thiab tso cai rau cov watt ntau dua txawm tias cov phab ntsa tuab. Lub voj voj voog tsim kom raug tuaj yeem rov qab tau 2-3 W / cm2 ntawm lub peev xwm dhau qhov tsis zoo. Ib txoj hauv kev thib peb yog kom txhob txwm tsim kom muaj qhov kub ntawm sab hauv hlau ntau dua rau cov dej num sib cuam tshuam. Yog tias lub tshuab cua sov ua haujlwm tsis tu ncua, xws li kom tswj tau qhov kub thiab txias hauv lub tank siv ob zaug hauv ib hnub, qhov cuam tshuam ntawm oxidation puas tsuaj rau txhua lub voj voog yog txwv. These conditions allow for a 20-30% improvement in watt density over the continuous rates without sacrificing the desired service life of many years.
Xaus: Muaj nuj nqi ntawm Watt ntom ntawm phab ntsa Thickness Tsis yog ib leeg
Qhov loj takeaway rau engineers qhia 316 stainless hlau qhwv hluav taws xob cua sov ntsiab yog tias koj tsis tuaj yeem xaiv phab ntsa thickness thiab watt ntom ntawm nws tus kheej. Ib tug nyias-walled rhaub ua hauj lwm nyob rau hauv high watt ceev yuav tsum tau kom muaj tib lub internal hlau kub raws li ib tug tuab -walled rhaub ua hauj lwm ntawm tsawg watt ceev. Tsis yog zoo dua. Lawv yog cov khoom siv sib txawv thiab thermal ua ntej. Thawj kauj ruam mus rau txoj cai specification yog mus nrhiav qhov prevailing txwv. Qhov twg cov khoom siv xws li siab, kev vibration, yaig xav tau 2.0 hli los yog tuab dua, qhov tso cai watt ceev yuav tsum tau qis qis dua, siv cov qauv tawm ntawm cov qauv tawm los ntawm cov txheej txheem thermal. Txawm li cas los xij, kom ua tiav lub zog siab ceev hauv ib lub hnab ntawv me me, lub hnab nyias nyias (1.0 hli lossis tsawg dua) yuav tsum tau ua kom qhov kub thiab txias sab hauv. Cov kws ua haujlwm yuav tsum qhia tag nrho cov kev xav tau ntawm lub zog thiab qhov siab tshaj plaws ntawm cov phab ntsa thickness rau cov chaw tsim khoom siv cua sov thiab thov kom cov chaw tsim khoom suav cov txiaj ntsig watt ntom ntom thiab siv tau lub neej kwv yees. Qhov kev sib koom ua ke no ua rau muaj qhov tshwj xeeb uas muaj suab nrov, thermally balanced thiab economically optimized - zam tus nqi zais ntawm kev ua tsis tiav ntxov thiab kev siv nyiaj ntau dhau ntawm cov qauv tsim.
