Ntawm Dab tsi tshwj xeeb kev sib xyaw ntawm Sodium Hydroxide Concentration thiab Sheath Surface Temperature Puas Yog 2.0 Millimeter 316 Stainless Steel Sheath Kev Ua Haujlwm Zoo Tshaj Plaws Hauv 18 Lub Hlis hauv Kev Pabcuam Nruam Textile Processing Heater Service?

Cov txheej txheem engineers ua hauj lwm nrog hluav taws xob immersion heaters rau textile processing khoom xws li mercerising machines, caustic reduction ranges thiab dye da dej rhaub nrog sodium hydroxide nyob rau hauv concentrations ntawm 5% mus rau 25% ntawm kub ntawm 60-95 degree. Lub 2.0 hli 316 stainless hlau sheath feem ntau yuav tsum tau rau txhua yam muaj zog tiv thaiv kev sib cuag nrog cov ntaub thiab kev co los ntawm cov khoom siv. Txawm li cas los xij, cov txheej txheem tsis zoo tuaj yeem ua tsis tiav nyob rau hauv qee qhov kev sib xyaw ua ke ntawm caustic concentration thiab elevated sheath nto kub los ntawm kev nruam watt ceev, uas ua rau muaj kev cuam tshuam dav dav uas ua txhaum cov phab ntsa 2.0 hli hauv tsawg dua 18 lub hlis. Kab lus no txiav txim siab cov ntsiab lus tseeb thaum 2.0 mm 316 sheath yuav tsum tau hloov pauv hauv kev pabcuam txuas ntxiv hauv kev ua textile.

Corrosion Hloov ntawm 316 ntawm Qhov Kub Kub Siab Caustic
316 stainless hlau qhia tau hais tias tus yam ntxwv passive- nquag hloov pauv hauv cov tshuaj sodium hydroxide raws li kev ua haujlwm ntawm qhov siab thiab kub. Corrosion tus nqi qis dua qhov hloov pauv kub yog tsawg dua 0.1 hli / xyoo. Cov nqi tuaj yeem yog ntau tshaj 1 hli hauv ib xyoos siab tshaj qhov hloov pauv. Kev hloov pauv kub ntawm 10% NaOH yog li 90 degree. Ntawm 15% NaOH nws yog 75C. Ntawm 20% NaOH nws txo qis rau 65 degree. Ntawm 25% NaOH qhov kev hloov pauv tshwm sim ntawm 55℃. Lub qhov kub ntawm qhov kub ntawm qhov txuas ntxiv - lub tshuab ua haujlwm immersion yog feem ntau 15-25℃saum toj no cov kua dej kub vim yog watt ntom. Rau cov ntaub ntawv mercerising da dej ntawm 18% NaOH thiab 70℃tej, thiab nrog lub rhaub ntawm 8 W / cm², lub sheath saum npoo kub yog 85-90 degree, tshaj 65℃kev hloov pauv pib rau 20% NaOH. Active corrosion pib nyob rau hauv lub plhaub nto thiab propagates ntawm tus nqi ntawm 0.8-1.5 hli yr-1. Lub 2.0 hli sheath yuav nkag mus rau 1.0 hli (yam tsawg kawg nkaus cov qauv thickness) nyob rau hauv 0.7-1.2 xyoo, justifying 18-lub hlis hloov.

Qhov tseem ceeb 18-Hloov Kev Pabcuam Lub Neej Ua Haujlwm
Raws li kev ntsuas immersion ntawm 316 cov qauv hauv cov tshuaj sodium hydroxide ntawm qhov kub thiab txias cuam tshuam rau kev tsim textile, cov nram qab no ua ke ntawm caustic concentration thiab sheath nto kub ua tiav lub siab tshaj plaws kev pab cuam lub neej ntawm 18 lub hlis rau ib tug 2.0 hli phab ntsa.

Concentration Sodium hydroxide, wt. % Kev daws qhov kub thiab txias Sheath deg kub ntawm 6 W / cm2 (15℃nce) Cia siab tias Corrosion Rate ntawm Nto Kub Lub Sijhawm Kom Txo 2.0 hli mus rau 1.0 hli Kev Pabcuam Lub Neej rau Hloov 5% 80℃95℃0.20 - 0.35 mm / xyoo 2.9 - 5.0 xyoo 3 - 6 xyoo 3 - 6 xyoo {15% 85℃/ xyoo xyoo 2 - 3.5 xyoo 5% 90℃105℃0.60 - 1.00 mm/xyoo 1.0 - 1.7 xyoo 1.2 - 2 xyoo
10% 70℃85℃0.15 - 0.25 hli / xyoo 4.0 - 6.7 xyoo 5 - 8 xyoo
10% 75℃90℃0.25 - 0.40 hli / xyoo 2.5 - 4.0 xyoo 3 - 5 xyoos
10% 80℃95℃0.40 - 0.70 mm / xyoo 1.4 - 2.5 xyoo 1.8 - 3 xyoo
10% 85℃100℃0.70 - 1.10 hli / xyoo 0.9 - 1.4 xyoo 1.2 - 1.8 xyoo
15% 60℃75℃0.20 - 0.35 hli / xyoo 2.9 - 5.0 xyoo 3 - 6 xyoo
15% 65 ° C 80 ° C 0.35 - 0.60 mm / xyoo 1.7 - 2.9 xyoo 2 - 3.5 xyoo
15% 70℃85℃0.60 - 1.00 mm / xyoo 1.0 - 1.7 xyoo 1.2 - 2 xyoos
15% 75℃90℃1.00 - 1.50 mm / xyoo 0.7 - 1.0 xyoo 0.8 - 1.2 xyoo 20% 50℃65℃0.25 - 0.40 mm / xyoo 2.5 - 4.0 xyoo 3 - 5 xyoo
20% 55℃70℃0.40 - 0.70 mm / xyoo 1.4 - 2.5 xyoo 1.8 - 3 xyoos
20% 60℃75℃0.70 - 1.20 hli / xyoo 0.8 - 1.4 xyoo 1.2 - 1.8 xyoo
20% 65℃80℃1.20 - 2.00 mm / xyoo 0.5 - 0.8 xyoo 0.6 - 1 xyoo 25% 45℃60℃0.35 - 0.60 mm / xyoo 1.7 - 2.9 xyoo 2 - 3.5 xyoo 25% 501.60 degree. 0.9-1.4 xyoo 1.2-1.8 xyoo
25% 55℃70℃1.20 - 2.00 mm / xyoo 0.5 - 0.8 xyoo 0.6 - 1 xyoo
Nyob rau hauv ib tug textile mercerising da dej (18% NaOH) ntawm ib tug tej kub ntawm 65 degree, lub sheath nto yog hais txog 80℃rau ib tug sheath ntawm 2.0 hli ntawm 6 W / cm2. Qhov projected corrosion tus nqi yog 0.8-1.4 hli / xyoo, uas yuav txo tau 2.0 hli phab ntsa rau 1.0 hli nyob rau hauv 0.7-1.2 xyoo. Kaum yim-hloov hloov pauv yog ua tau nrog cov txheej txheem ceev faj. Los ntawm kev txo qhov kub ntawm 60 degree, qhov kub ntawm qhov chaw yuav raug txo mus rau 75 degree, tus nqi corrosion mus rau 0.6-1.0 hli ib xyoo thiab lub neej mus rau 1.2-1.8 xyoo.

Lub hnab ntawv ua haujlwm nyab xeeb rau 18 lub hlis hloov sijhawm
Txhawm rau kom paub tseeb tias tsawg kawg 18 lub hlis kev pabcuam lub neej, ua ntej phab ntsa txo mus rau 1.0 hli yuav tsum tau hloov, qhov siab tshaj plaws kev nyab xeeb ntawm sodium hydroxide kub rau 2.0 hli 316 sheath ntawm ntau yam watt ntom yog qhia hauv cov lus hauv qab no.

Watt Ceev (Temperature Rise) Max Bulk Temp rau 10% NaOH Max Bulk Temp rau 15% NaOH Max Bulk Temp rau 18% NaOH Max Bulk Temp rau 20% NaOH Max Bulk Temp rau 25% NaOH
4 W / cm2 (10℃sawv) 82℃72℃66℃62℃52℃6 W / cm2 (15℃sawv) 77℃67℃61℃57℃47℃8 W / cm2 (20℃sawv) 72℃62℃56℃52℃W / cm2 57℃51℃47℃37 degree
Rau kev lag luam textile da dej ntawm 18% NaOH ntawm 60℃bulk kub nrog 6 W / cm2 (15℃nce, 75℃nto) qhov kev txwv tsis pub muaj kev nyab xeeb yog 61℃-tau txais. Ntawm 65℃bulk nrog zoo tib yam watt ceev, qhov kev nyab xeeb txwv tau dhau mus thiab lub neej kev pabcuam 18 lub hlis tsis tau lav.

Tsim Cov Kev Hloov Kho rau Lub Neej Extension dhau los 18 Lub Hlis
Yog tias cov txheej txheem ua cov ntaub ntawv yuav tsum muaj qhov kub thiab txias uas txwv 2.0 hli 316 sheath mus rau 18 lub hlis lub neej, peb qhov kev hloov kho tuaj yeem ua rau lub neej ntev. Thawj qhov yog siv lub tshuab cua sov ntev dua lossis ntau lub tshuab cua sov kom txo qis watt ceev. Tsiv ntawm 6 W / cm 2 mus rau 4 W / cm 2 txo qhov kub thiab txias ntawm 15℃mus rau 10 degree, thiab txav feem ntau ntawm cov concentrations ntawm 1-1.5 xyoo tswj mus rau 1.5-2.5 xyoo tswj. Qhov kev hloov thib ob yog txhawm rau txhim kho qhov ntws ntawm cov tshuaj hla lub rhaub dej. Kev ntxhov siab lossis cov twj tso kua mis tuaj yeem txo qhov kub ntawm qhov kub ntawm 40-60% vim muaj qhov tsis sib haum xeeb, ua kom lub plhaub txias dua thiab nyob rau hauv kev ua haujlwm tsis zoo. Qhov thib peb kev hloov pauv yog mus rau cov khoom siv nickel-based alloy, xws li Alloy 600 lossis Alloy 825. Cov ntaub ntawv no muaj qhov corrosion ntawm tsawg dua 0.1 hli / xyoo hauv 25% NaOH ntawm 80 degree, ua rau lub neej ua haujlwm ntawm 10+ xyoo. Rau cov khoom siv hluav taws xob txuas ntxiv ua cov khoom lag luam poob vim qhov tsis tau pom dua lub tshuab hluav taws xob tsis ua haujlwm, tus nqi nce ntxiv ntawm kev hloov kho alloy yog rov qab sai. Thaum qhia txog cov cua sov rau kev siv cov ntaub ntawv caustic, ib txwm hais qhov tseeb NaOH concentration, qhov kub thiab txias, kwv yees lub luag haujlwm thiab lub sijhawm hloov pauv. Lub 18-hli hloov chaw rau 2.0 hli 316 sheath yog ib qho kev ua haujlwm ntawm caustic concentration, bulk kub thiab watt ntom thiab tso cai rau kev kwv yees meej ntawm lub rhaub lub neej hauv mercerising thiab caustic txo cov haujlwm.