Ntawm Qhov Kev Sib Txuas Tshwj Xeeb ntawm Sodium Hydroxide Concentration thiab Sheath Surface Temperature Puas Yog 1.6 Millimeter 316 Stainless Steel Sheath Yuav Tsum Tau Hloov Txhua 12 Lub Hlis hauv Tank Tu Nozzle Heater Service?

Cov kws kho tsheb tu lub luag haujlwm rau lub tshuab ntxuav lub tank hauv kev ua zaub mov, kev tsim dej haus thiab cov chaw tshuaj lom neeg feem ntau muaj cov tshuab hluav taws xob tso rau hauv cov twj tso kua mis los ntxuav cov tshuaj ntxuav tais diav kom sov. Tus neeg saib xyuas tseem ceeb yog sodium hydroxide, feem ntau ua haujlwm ntawm qhov siab ntawm 2-5% thiab kub ntawm 70-85 degree. Cov cua sov no feem ntau yog siv 1.6 hli 316 stainless hlau sheath uas muab kev cuam tshuam zoo ntawm kev tiv thaiv corrosion thiab kev ua haujlwm ruaj khov tiv thaiv qhov cuam tshuam nozzle. Txawm li cas los xij, kev txhim kho corrosion ntxiv, vim qee qhov kev sib xyaw ua ke ntawm caustic concentration thiab siab sheath nto kub (watt ntom), tuaj yeem ua rau lub neej luv luv rau 12 lub hlis lossis tsawg dua. Kab lus no txhais cov ntsiab lus raws nraim qhov uas 1.6 hli 316 sheath yuav tsum tau hloov txhua xyoo rau lub tank tu nozzle cua sov kev pab cuam.

Caustic Corrosion Cwj Pwm ntawm 316 ntawm High Deg Kub
Thaum kub txog li 80 degree, stainless hlau hom 316 yog passive nyob rau hauv cov kev daws teeb meem ntawm sodium hydroxide nrog concentrations hauv qab no 5%, thiab muaj corrosion ntawm tsawg tshaj li 0.1 hli / xyoo. Txawm li cas los xij, nrog qhov nce ntawm cov cua sov flux, lub sheath nto kub nce, thiab cov zaj duab xis passive tsis ruaj khov. Tus nqi corrosion nyob rau hauv 3% NaOH ntawm qhov kub thiab txias ntawm 85℃yog tsawg dua 0,1 hli hauv ib xyoos. Nws nce mus txog 0.2-0.4 hli txhua xyoo ntawm 95 degree. nws yog 0.5-1.0 hli ib xyoo ntawm 105 degree. Tus nqi siab tshaj 2 hli / xyoo ntawm 115 degree. Nrog rau 1.6 hli sheath corrosion nkag mus rau 1.0 hli (yam tsawg yam ntxwv thickness rau feem ntau daim ntaub ntawv) yuav siv sij hawm 1-2 xyoo ntawm 1 hli ib xyoo. Tus nqi corrosion yog ntawm qhov kev txiav txim ntawm 0.6-0.8 hli hauv ib xyoos thaum sib xyaw ua ke ntawm caustic concentration thiab sheath saum npoo kub ncav cuag 12 lub hlis hloov chaw uas siv 1.6 hli phab ntsa rau 1.0 hli hauv 12 lub hlis.

Cov kev hloov pauv tseem ceeb rau 12 Lub Hlis Kev Pabcuam lub neej
Kev ntsuas dej ntawm 316 cov qauv hauv cov tshuaj sodium hydroxide ntawm qhov kub thiab txias cuam tshuam rau kev ntxuav lub tank qhia tau hais tias cov nram qab no ua ke ntawm caustic concentration thiab sheath nto kub muab 12 lub hlis siab tshaj plaws kev pab cuam lub neej rau 1.6 hli phab ntsa:

Concentration ntawm Sodium Hydroxide (Nyem %) Kub ntawm Bulk Solution Temperature ntawm Sheath Surface ntawm 8 W / cm2 (20℃nce) Cia siab rau Corrosion Rate ntawm Surface Temperature kom txo 1.6 mm mus rau 1.0 mm (0.6 mm poob) Kev Pabcuam Lub Neej rau Hloov 2% 70.25 mm2 - 15℃4 xyoos 3 - 5 xyoos 2% 80℃100℃0.30 - 0.50 mm / xyoo 1.2 - 2 xyoos 1.5 - 2.5 xyoo 2% 85℃105℃0.50 - 0.80 mm / xyoo 0.75 - 1.2 xyoos 1 - 2070℃0.35 hli / xyoo 1.7 - 3 xyoo 2 - 3.5 xyoo 3% 75℃95℃0.35 - 0.60 mm / xyoo 1.0 - 1.7 xyoo 1.2 - 2 xyoo 3% 80℃100℃0.60 - 1.00 mm / xyoo 1.0 - 1.7 hli 65℃85℃0.25 - 0.40 mm / xyoo 1.5 - 2.4 xyoo 1.8 - 3 xyoos 4% 70℃90℃0.40 - 0.70 mm / xyoo 0.9 - 1.5 xyoo 1 - 1.8 xyoo 4% 75℃950 mm / xyoo 10.7 xyoo 0.6 - 1 xyoo 5% 60℃80℃0.30 - 0.50 mm / xyoo 1.2 - 2 xyoo 1.5 - 2.5 xyoo 5% 65℃85℃0.50 - 0.85 mm / xyoo 0.7 - 1.2 xyoo 0.85 - 1.70% xyoo
Rau lub tank tu system nrog 3% NaOH ntawm 80℃tej qhov kub thiab txias ntawm 1.6 hli, lub plhaub saum npoo kub yog li 100℃ntawm 8 W / cm^2. Qhov kwv yees tus nqi ntawm corrosion yog 0.6-1.0 hli / xyoo, txo cov phab ntsa thickness ntawm 1.6 hli mus rau 1.0 hli hauv 0.6-1.0 xyoo. Hloov hauv 12 lub hlis yog OK. Thaum qhov kub thiab txias tau txo mus rau 75℃qhov kub ntawm qhov chaw yog 95℃thiab yog li ntawd tus nqi corrosion yog 0.35-0.60 hli ib xyoo thiab lub neej yog 1.2-2 xyoo.

12-hli hloov lub voj voog ua haujlwm ruaj ntseg hnab ntawv
Cov lus hauv qab no qhia tau hais tias muaj kev nyab xeeb ntau tshaj plaws sodium hydroxide concentration thiab kub ua ke rau 1.6 hli 316 sheath ntawm ntau watt ntom ntom kom pab tau tsawg kawg 12 lub hlis ntawm kev pab cuam lub neej ua ntej phab ntsa thickness txo mus rau 1.0 hli xav tau hloov.

Watt Density Temp. ntawm bulk rau 2% NaOH Temp. ntawm bulk rau 3% NaOH Temp. ntawm bulk rau 4% NaOH Temp. ntawm bulk rau 5% NaOH
4 W / cm² (10℃sawv) Safe mus txog 88℃Safe mus txog 82℃Safe mus txog 78℃Safe mus txog 72℃6 W / cm² (15℃sawv) Safe mus txog 83℃Safe mus txog 77℃Safe mus txog 73℃Safe mus txog 67℃Safe 8 W / cm² (20℃sawv 78 degree) Safe mus txog rau mus txog 62℃10 W / cm² (25℃nce) Safe mus txog 73℃Safe mus txog 67℃Safe mus txog 63℃Safe mus txog 57℃12 W / cm² (30℃sawv) Safe mus txog 68℃Safe mus txog 62℃Safe mus txog 58℃Safe mus txog 52 degree
Rau ib tug raug tank tu system nrog 3% NaOH ntawm 75℃tej kub, ib tug 1.6 hli 316 sheath ntawm 8 W / cm² ua rau ib tug deg kub ntawm 95 degree. Qhov kub zoo rau 3% NaOH ntawm 8 W / cm2 yog 72℃ntawm lub rooj. Lub tshuab rhaub tshaj qhov kev txwv tsis pub dhau ntawm 75℃thiab lub neej kev pab cuam ntawm 12 lub hlis tsis paub tseeb. Txo watt ceev mus rau 6 W / cm2 (15degC nce) muaj kev nyab xeeb ntawm 77degC, yog li 75degC yog OK rau 12 lub hlis hloov.

Tsim Cov Kev Hloov Kho kom ncua kev pab lub neej dhau 12 lub hlis
Peb qhov kev txhim kho tsim tau piav qhia uas tuaj yeem txuas ntxiv lub neej kev pab cuam thaum lub tank ntxuav cov txheej txheem thov kom muaj qhov kub thiab txias uas yuav txwv tsis pub 1.6 hli 316 sheath mus rau 12-hli lub neej. Thawj yog kom txo qis watt ceev los ntawm kev siv lub tshuab hluav taws xob ntev dua lossis loj dua. Txo cov watt ceev ntawm 8 W / cm2 mus rau 4 W / cm2 txo qhov kub ntawm qhov kub ntawm 20℃mus rau 10 degree, uas sib haum mus rau kev hloov pauv ntawm 1 xyoo kev tiv thaiv corrosion mus rau 2-3 xyoo kev tswj hwm ntawm feem ntau cov concentrations. Qhov kev hloov thib ob yog qhov sib ntxiv ntawm lub sijhawm kom khiav lub rhaub tsuas yog thaum lub tank tau ua haujlwm huv, tsis yog tswj xyuas qhov kub ntawm 24/7. Kev ua haujlwm tsis tu ncua txo lub sijhawm ntawm qhov kub siab, txuas ntxiv lub neej ntawm daim ntawv qhia hnub los ntawm qhov zoo sib xws rau lub voj voog ua haujlwm. Yog tias tus nqi corrosion nyob rau ib teev yog tib yam, lub rhaub dej kub khiav 4 teev hauv ib hnub es tsis yog 24 teev hauv ib hnub yuav kav ntev dua 6 zaug hauv daim ntawv qhia hnub. Raws li kev hloov pauv thib peb, cov tshuaj tiv thaiv corrosion ntxiv rau cov tshuaj caustic. Silicates los yog phosphates ntawm 100-200 ppm tuaj yeem txo tus nqi corrosion los ntawm 30-50% thiab nce kev pab cuam lub neej los ntawm 40-100%. Yog tias lub tshuab ntxuav lub tank xav tau 4% NaOH ntawm 80℃thiab khiav tsis tu ncua, nws tsis ntseeg tias cov kev hloov pauv no yuav ua rau lub neej ntev dua 316 lub hlis dhau los 12 lub hlis. Nyob rau hauv cov xwm txheej no, engineers yuav tsum tau hloov mus rau ib tug npib tsib xee-raws li alloy xws li Alloy 600 los yog Alloy 825, uas ua kom corrosion nqi qis dua 0.1 hli ib xyoo nyob rau hauv caustic tov txog li 10% concentration ntawm 100℃C. Thaum xaj cov cua sov rau tank tu cov kev pab cuam, yeej ib txwm muab cov neeg muag khoom nrog lub siab tshaj plaws caustic siab concentration, bulk siab siab concentration, bulk siab siab, thiab bulk siab siab concentration. Yog tias cov chaw tsim khoom pom zoo 316 rau 4% NaOH ntawm 85℃yam tsis tau piav qhia txog watt density derating los yog kwv yees lub neej kev pab cuam, ces nws tsis muab cov lus qhia txog engineering. Lub 12 hli hloov qhov pib rau 1.6 hli 316 sheath yog ib qho kev ua haujlwm ntawm caustic concentration, bulk kub thiab watt ntom. Los ntawm kev txiav txim siab qhov kub ntawm qhov kub thiab siv cov nqi corrosion hauv lub rooj, cov kws ua haujlwm tuaj yeem kwv yees cov sijhawm hloov pauv thiab cov peev nyiaj rau kev saib xyuas, zam qhov tsis xav txog lub tshuab cua sov uas yuav cuam tshuam kev tu lub voj voog.