Yuav ua li cas xaiv qhov zoo tshaj plaws lub zog ntom ntom rau cov ntshiab titanium cua sov raj hauv fermentation tso tsheb hlau luam

Lub zog cua sov uas tau los ntawm ib chav tsev sab nrauv ntawm lub titanium raj yog qhia los ntawm lub zog ntom ntom (W / cm²). Nws yog lub hauv paus tsim parameter uas tswj cov kev pab cuam lub neej, scaling ceev, passive zaj duab xis laus tus nqi, thiab kub ntawm lub raj phab ntsa. A power density that is excessively high results in local overheating, which accelerates the deposition of fouling and the cracking of the TiO₂ film. Conversely, a power density that is too low unduly lengthens the tube and increases the procurement cost. This paper offers classified power density selection standards and supporting design optimisation schemes for titanium heating tubes, in conjunction with the composition of the fermentation medium, the operating temperature, and the cleaning frequency.

1. Tej zaum yuav muaj kev phom sij cuam tshuam nrog lub zog ntawm lub zog ntau dhau
Passive zaj duab xis thermal degradation yog expedited los ntawm lub zos overheating. Qhov kub ntawm qhov sib txawv ntawm lub raj tub ntxhais thiab cov phab ntsa sab nrauv yog nce los ntawm cov cua kub hnyav, uas ua rau muaj qhov sib txawv ntawm thermal expansion mismatch ntawm brittle titanium dioxide zaj duab xis thiab titanium substrate. Organic acid thiab chloride ions muaj peev xwm nkag mus thiab tsim pitting corrosion raws li qhov tshwm sim ntawm cov cua sov ntau zaus - kaw lub voj voog uas tsim ntau microcracks ntawm zaj duab xis.

Lub thermal nag lossis daus sai ntawm cov organic thiab ntxhia nplai Qab Zib, calcium, thiab magnesium compounds pom qhov txo qis hauv solubility ntawm qhov siab ntawm phab ntsa. Lub raj nto yog ceev ceev los ntawm tuab, compact carbonised scale, uas ua rau tsim nyob rau hauv - deposit crevice corrosion qhov chaw thiab ib tug txo nyob rau hauv tshav kub exchanger efficiency.

CIP acid-kev ntxuav hauv qab ua rau muaj kev puas tsuaj loj heev. Cov tshuaj tiv thaiv tus nqi ntawm cov kua qaub / alkali nrog cov zaj duab xis passive yog nrawm los ntawm cov phab ntsa ntawm lub raj kub dhau, ua rau lub sijhawm luv dua -passivation kho qhov rais thiab cov yeeb yaj kiab sai dua tom qab txhua lub voj voog tu.

Internal thermal resistance wires muaj ib tug txwv lifespan. Lub rwb thaiv tsev muab tub lim nyob rau hauv lub cua sov tube yog txuas ntxiv ci los ntawm lub siab tube phab ntsa kub, uas accelerates cov laus ntawm cov rwb thaiv tsev thiab ua rau kom muaj feem ntawm hluav taws xob tsis ua hauj lwm.

2. Qhov tsis zoo ntawm lub zog ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom
Kev nce hauv titanium raw khoom noj thiab ib qho - sij hawm yuav khoom tus nqi yog tsim nyog los ua kom txaus siab rau cov cua sov load, uas yuav tsum tau ib tug loj dua tag nrho cov tube nto cheeb tsam.

Kev sib hloov agitator, kua ntws, thiab lub tank ntxuav cov chaw tuag raug cuam tshuam los ntawm qhov chaw nyob hauv lub tank ntxiv.

Cov kab ntau lawm kev ua haujlwm tau raug txo qis vim qhov tshwm sim ntawm fermentation broth qhov kub nce qeeb, uas tsis tuaj yeem ncav cuag qhov ntsuas kub tsis tu ncua - tus qauv kab lis kev cai.

3. Recommended surface power density standards on a graded scale for various fermentation working conditions
Chav Kawm 1: Kev fermentation me me nrog cov load tsawg (tsawg dua los yog sib npaug li 40 degree, sib quas ntus 8- teev ua haujlwm, CIP tu txhua lub lim tiam, qis qab zib dilute broth)
Optimal zog ceev: 0.8 mus rau 1.2 W / cm² Ua hauj lwm yam ntxwv: Lub teeb corrosion load, sluggish scaling ceev, thiab tsawg nruab nrab viscosity; lub peev xwm los tswj lub raj ntev thiab txuag qhov chaw tank los ntawm kev siv lub zog loj dua me ntsis.

Chav Kawm 2: Nruab nrab- thauj cov pa fermentation (40 ~ 55 degree, 16 teev ntawm kev ua haujlwm tas mus li ib hnub, ob lub lis piam alternating acid-base CIP, ib txwm muaj qab zib concentration broth)
Qhov zoo tshaj plaws lub zog ceev: 0.5 txog 0.8 W / cm² Qhov feem ntau ua hauj lwm tus qauv tsis yog cov qauv zaub mov / kev kho mob fermentation mainstream ua hauj lwm, uas yog yus muaj los ntawm ib tug balanced cua sov efficiency thiab tiv thaiv -corrosion kev pab cuam lub neej.

Class 3: High-load severe fermentation (>55 degree, 24-teev tsis- nres ntau lawm, txhua hnub acid-base CIP, siab-viscosity high-syrup broth)
Lub zog pom zoo yog nyob nruab nrab ntawm 0.3 thiab 0.5 W / cm². Cov yam ntxwv ua haujlwm: nquag acid-puag yaig, nrawm nrawm nrawm nrawm, thiab kub nruab nrab. Lub ultra- low heat load regulates qhov nce hauv tube phab ntsa kub kom txo tau cov zaj duab xis passive cumulative puas tsuaj, yog li no ho ncua lub overhaul voj voog.

Kev txwv ntxiv rau kev ua haujlwm tshwj xeeb
Lub tshuab nqus tsev tsis zoo siab fermentation concentration tank (yooj yim qhuav raj nto): Lub zog ceev tau raug txo los ntawm 30% raws li cov qauv hais los saum toj no los tiv thaiv corrosion los ntawm lub zos ultrahigh kub qhuav - tawm.

Yog tias qhov nruab nrab muaj TDS ntsev ions siab, qhov siab tshaj plaws lub zog yuav tsum tsis pub tshaj 0.6 W / cm² thiaj li tiv thaiv kom tsis txhob muaj ion nyob rau hauv - nplai pitting.

Txhawm rau txo qhov sib txawv ntawm cov matrix etching tus nqi, lub zog ceev yuav tsum tau tswj nruj me ntsis ntawm Tsawg dua los yog sib npaug rau 0.4 W / cm² hauv kab fermentation nrog cov tshuaj fluoride ib puag ncig impurities.

4. Pab txhim kho qhov zoo ntawm kev tsim kom haum nrog lub zog tsis tshua muaj zog
Ua kom zoo rau sab nraud ntawm lub raj nyob rau hauv ib qho kev ruaj ntseg tag nrho cov cua sov muaj peev xwm, chav tsev cua sov load yog txo los ntawm ib tug loj sab nrauv cheeb tsam. Rau siab -load tanks, nws raug pom zoo kom siv DN40/DN50 loj- txoj kab uas hla titanium raj es tsis yog me me DN25 nyias raj.

Ua ib qho kev faib tawm nrog ntau lub raj. Zam ib leeg ultra-ntev siab- lub hwj chim raj nrog lub nra hnyav dhau thiab faib tag nrho cov cua sov lub zog ntawm ntau lub titanium cua sov tubs.

Txhim kho cov txheej txheem ntawm cov kua dej kom txo qis hauv zos overheating tsub zuj zuj, tshem tawm cov cua sov tam sim ntawd, thiab ua kom cov kua ntws tawm ntawm cov cua kub kom ntau dua lossis sib npaug li 1.0 m / s, circulating baffles yuav tsum tau nruab.

Ua kom muaj kev tiv thaiv corrosion rau lub raj phab ntsa Ntxiv 0.3mm phab ntsa thickness cia ntawm qhov chaw hloov pauv rau qhov siab -load tso tsheb hlau luam nrog lub zog ntom ntom hauv qab 0.5 W / cm² txhawm rau txhim kho lub sijhawm ntev - corrosion kuj.

5. Ua raws li kev tswj xyuas kev ua haujlwm uas sib haum nrog lub zog ntom ntom tsim
Siv cov cua sov gradient nrog kev nce qib hauv lub zog kom qeeb qhov tsim ntawm thermal stress thiab tiv thaiv tag nrho - lub zog pib hauv lub xeev txias.

Txo lub zog cua sov los ntawm 50% thaum lub sij hawm CIP tu ncig kom txo qhov kub ntawm lub raj phab ntsa thiab tiv thaiv acid- puag zaj duab xis yaig.

Ua ib qho kev tshuaj xyuas txhua hli ntawm lub thickness ntawm qhov scaling ntawm lub raj nto. Yog tias qhov ntsuas tau nrawm nrawm, txo qis lub zog ua haujlwm ib ntus tus nqi siab tshaj plaws thiab ua ntej lub sijhawm tu.

Tswv yim:

Fermentation Ua hauj lwm Load pom zoo Surface Power Density Core Design Purpose
Tsawg-kub tsis sib xws qis- qab zib fermentation 0.8 txog 1.2 W / cm² Ceev cua kub ceev, tswj tube kom muaj nuj nqis, thiab tus nqi yuav khoom
0.5–0.8 W / cm² rau cov pa nruab nrab -kub nruam fermentationTau qhov sib npaug ntawm cov kev pab cuam lub neej ntawm passive films thiab efficiency ntawm tshav kub hloov lwm lub tsev
High-viscosity syrup fermentation ntawm qhov kub thiab txias rau 24 teev ntawm tus nqi ntawm 0.3 txog 0.5 W / cm² Txo qhov kev laus ntawm zaj duab xis, qeeb scaling, thiab overheating ntawm lub raj phab ntsa.
Cov dej khib nyiab ntsev nrog nce TDS thiab lub tshuab nqus tsev nyob ntawm qhov chaw tsim qauv, lub zog ceev yuav tsum raug txo los ntawm 30% Tiv thaiv kom tsis txhob muaj ntsev ion pitting thiab concentrated corrosion vim dryout.
Condensed Summary
The surface power density of titanium heating tubes must be reduced in proportion to the℃to which the fermentation temperature, broth viscosity, and cleaning frequency increase. Ultra- qauv tsim hluav taws xob tsawg yog siv nyob rau hauv siab -load, hnyav ntau lawm ib puag ncig los tiv thaiv lub raj phab ntsa overheating, qeeb passive zaj duab xis tawg, thiab fouling deposition. Tus nqi tsis zoo ntawm cov qauv siv hluav taws xob tsawg tuaj yeem txo tau los ntawm qhov tsim nyog sib piv ntawm txoj kab uas hla ntawm lub raj, ntau- raj architecture, thiab circulating flow optimisation, uas ua rau lub sij hawm ntev - ruaj khov los tiv thaiv- corrosion ua hauj lwm ntawm titanium cua sov raj.