PTFE Cov Hluav Taws Xob Hluav Taws Xob puas tuaj yeem siv rau Evaporating Corrosive Liquids?

"Ib tsob nroj hlau tiav ua rau cov kua qaub diluted uas yuav tsum tau ua kom muaj zog kom txo tau cov nqi pov tseg. Evaporation zoo tagnrho, tab sis cov kua qaub yuav tawm tsam cov hlau feem ntau. PTFE exchangers yog corrosion- pov thawj, tab sis lawv puas tuaj yeem ua rau boiling? Yuav ua li cas scaling thiab pheej hmoo ntawm cov pob qhuav qhuav?" Cov lus nug no tshwm sim ntau zaus hauv kev lag luam uas tswj cov tshuaj lom neeg nruj heev. Electroplating cov chaw, tshuaj nroj tsuag, thiab kev kho cov khib nyiab feem ntau tsim cov kua qaub los yog cov ntsev ntsev uas yuav tsum tau ua kom muaj zog ua ntej pov tseg lossis rov qab los. Evaporation yog ib txoj hauv kev zoo nkauj vim nws tshem tawm cov dej kom zoo, txo qhov ntim ntawm cov kua pov tseg thaum rov qab cov tshuaj muaj txiaj ntsig. Qhov kev sib tw yog nyob rau hauv kev xaiv cov ntaub ntawv uas tuaj yeem tiv taus ob qho tib si corrosive chemistry thiab qhov xav tau thermal tej yam kev mob cuam tshuam nrog boiling. PTFE heat exchangers muab kev cog lus zoo nyob rau hauv ib puag ncig zoo li no. Paub txog lawv cov tshuaj tiv thaiv tshwj xeeb, PTFE cov ntaub ntawv feem ntau inert rau cov kua qaub, cov hauv paus, thiab ntau cov oxidizing cov neeg ua haujlwm uas yuav ua rau cov khoom siv hlau sai sai. Cov yam ntxwv no ua rau lawv tshwj xeeb tshaj yog rau cov txheej txheem xws li acid rov qab, brine concentration, thiab pov tseg cov kwj ntim txo. Txawm li cas los xij, evaporation qhia txog kev sib tw engineering ntxiv piv nrog cov cua sov yooj yim lossis txias, yuav tsum tau ua tib zoo tsim kom ntseeg tau tias kev ua tau zoo. Evaporation yuav nqa cov txheej txheem ua kua mus rau nws lub boiling point kom ib feem ntawm cov kua vaporizes thiab tawm hauv cov kua theem. Cov theem no hloov absorbs ib tug tseem ceeb npaum li cas ntawm lub zog nyob rau hauv daim ntawv ntawm latent tshav kub. Raws li qhov tshwm sim, cov txheej txheem evaporation feem ntau cuam tshuam nrog cov kub kub fluxes ntawm qhov kub hloov chaw. Nyob rau hauv cov pa hlau evaporators, lub siab thermal conductivity ntawm cov khoom tso cai hloov pauv ntawm tshav kub mus rau lub boiling kua. PTFE muaj cov thermal conductivity qis dua li cov hlau feem ntau, uas txhais tau tias cov khoom siv hluav taws xob tsis zoo. Txhawm rau them nyiaj rau cov cuab yeej no, PTFE cov khoom siv hluav taws xob siv rau hauv cov tshuab evaporation feem ntau yog tsim los nrog cov phab ntsa nyias thiab cov chaw hloov hluav taws xob loj. Ntau lub raj, nthuav dav geometries, lossis cov khoom sib pauv tshwj xeeb yog siv los ua kom muaj qhov chaw uas muaj cua sov tuaj yeem nkag mus rau hauv cov kua. Nyob rau hauv lub evaporator, boiling kub hloov feem ntau tshwm sim nyob rau hauv lub nucleate boiling tsoom fwv. Nyob rau hauv txoj cai no, vapor npuas tsim rau ntawm qhov chaw sov thiab tshem tawm thaum lawv nce los ntawm cov kua. Cov txheej txheem no txhim khu kev sib tov ze ntawm qhov chaw thiab txhim kho cov cua sov hloov pauv piv nrog cov convection yooj yim. Txawm li cas los xij, yog tias cov cua sov ua kom siab dhau los lossis cov kua dej tsis txaus, vapor tuaj yeem sau rau ntawm qhov chaw thiab tsim ib daim pam vapor. Cov xwm txheej no, qee zaum hu ua zaj duab xis boiling, txo cov cua sov hloov mus rau qhov kub thiab tuaj yeem ua rau overheating. PTFE cov yam ntxwv saum npoo tuaj yeem cuam tshuam cov npuas tsim thiab tso tawm thaum lub sijhawm boiling. Cov khoom siv lub zog qis tuaj yeem cuam tshuam li cas npuas nucleate thiab detach. Vim li no, kev sim lossis tus tsav- kev ntsuas ntsuas feem ntau yog pom zoo thaum tsim PTFE- raws li cov evaporators rau cov tshuab tshuaj tshiab. Kev nkag siab txog cov txheej txheem cov kua dej coj li cas thaum lub boiling pab xyuas kom meej tias lub exchanger ua hauj lwm nyob rau hauv kev nyab xeeb thiab npaum txwv. Scaling thiab fouling sawv cev rau lwm qhov kev txhawj xeeb tseem ceeb hauv evaporation systems. Raws li dej evaporates los ntawm ib qho kev daws, yaj ntsev thiab lwm yam khib nyiab ua kom muaj zog dua. Yog hais tias qhov kev daws teeb meem mus txog saturation, cov ntaub ntawv no yuav pib crystallize thiab tso rau ntawm tshav kub hloov chaw. Xws li cov deposits txo cov tshav kub hloov efficiency thiab tej zaum nws thiaj li cuam tshuam txoj kev khiav. PTFE's non-stick deg muab qhov txiaj ntsig zoo hauv qhov no. Qhov saum npoo du ua rau muaj zog adhesion ntawm ntau cov crystalline deposits, ua scale tsim tsawg dua nyob rau hauv cov ntaub ntawv rougher. Scaling yog tus yeeb ncuab ntawm cov evaporators, thiab PTFE lub zog ntawm lub zog qis muab nws ib qho ntug hauv kev tswj kom huv si hloov chaw. Txawm li cas los xij, thaum tsom cov kev daws teeb meem ze rau lawv cov kev txwv solubility, qee qhov qib ntawm crystallization feem ntau tsis tuaj yeem zam. Cov evaporator tsim yog li ntawd feem ntau suav nrog kev tu thiab tu. Tshem tau cov hlua khi lossis cov chaw nres nkoj nkag tau tso cai rau kev tshuaj xyuas ib ntus thiab tshem tawm cov khoom khib nyiab. Hauv qee qhov kev teeb tsa, ntxuav -hauv- cov txheej txheem siv cov kuab tshuaj sib xws lossis cov kua qaub me me tuaj yeem rov ua haujlwm yam tsis muaj kev cuam tshuam cov khoom siv. Kev txwv qhov kub thiab txias yuav tsum tau txiav txim siab. PTFE feem ntau tuaj yeem ua haujlwm tsis tu ncua ntawm qhov kub thiab txias hauv thaj tsam li ntawm 150 txog 200 degree, nyob ntawm qib thiab kev tsim kho tshuab. Ntau cov txheej txheem evaporation uas muaj cov kua qaub aqueous lossis dilute cov tshuaj lom neeg tshwm sim zoo hauv qab cov kev txwv no, ua rau PTFE haum rau cov dej num zoo li no. Txawm li cas los xij, cov txheej txheem cuam tshuam nrog siab - cov kua organic boiling lossis kub ua haujlwm siab heev tuaj yeem dhau qhov kev txwv no thiab yuav tsum muaj lwm yam khoom siv. Lwm qhov tseem ceeb ntawm kev tsim evaporator yog vapor-kua sib cais. Thaum boiling tshwm sim, vapor yuav tsum tau tso cai kom dim ntawm cov kua theem. Yog tias vapor tsub zuj zuj zuj zus, nws tuaj yeem cuam tshuam kev ncig thiab txo qis kev hloov hluav taws xob. Vim li no, PTFE kub exchangers siv nyob rau hauv evaporation systems feem ntau ntsia nyob rau hauv ntsug orientations los yog kev koom ua ke rau hauv evaporator hlab ntsha nrog txaus vapor qhov chaw saum lub boiling kua. Cov chaw sib cais txaus tso cai rau cov vapor kom tshem tawm cov kua ua ntej tawm hauv lub cev. Cov vapor tuaj yeem raug coj mus rau cov dej ntws qis lossis cov tshuab rov qab, nyob ntawm cov txheej txheem yuav tsum tau ua. Kev txiav txim siab poob siab kuj tseem cuam tshuam txog kev tsim qauv. Hauv cov txheej txheem evaporation, ob qho tib si kua ntws thiab vapor txav yuav tsum tau haum yam tsis muaj kev tiv thaiv ntau dhau. Siv cov raj loj me me los yog cov geometry tshwj xeeb tuaj yeem pab tswj kom tsis txhob muaj kev poob qis thaum tseem muab cov cua sov txaus rau qhov chaw. Kev ua haujlwm ruaj khov kuj nyob ntawm kev tswj cov txheej txheem zoo. Kev tswj xyuas cov kua dej sib npaug hauv cov evaporator pab tiv thaiv kom qhuav-tawm cov xwm txheej uas cov tshav kub hloov mus rau qhov chaw tsis muaj dej txaus. Qib sensors thiab kev tswj tsis siv neeg tswj cov khoom noj txaus thiab cov khoom siv hluav taws xob, kom ntseeg tau tias qhov kub thiab txias tshwm sim nyob rau hauv qhov sib txawv ntawm qhov sib txawv. Kev npaj tu thiab tu vaj tse ntxiv txhawb nqa ntev - lub sij hawm cia siab. Tsim cov txheej txheem kom huv huv-hauv- cov txheej txheem tso cai rau cov neeg ua haujlwm txhawm rau tshem tawm cov khoom sib hloov ib ntus uas siv cov tshuaj ntxuav kom tsim nyog. Kev saib xyuas kuj tseem yuav tsum tau ua kom ntseeg tau tias cov khoom siv gaskets, cov ntsaws ruaj ruaj, thiab cov khoom siv pabcuam tau sib haum nrog cov kua dej kub npau npau thiab ua haujlwm kub. Piv nrog cov pa hlau evaporators, PTFE cov khoom siv hluav taws xob tshem tawm qhov kev pheej hmoo ntawm kev xeb hauv cov tshuaj lom neeg nruj heev. Cov hlau raug cov kua qaub los yog cov tshuaj ntsev ntsev tuaj yeem raug kev puas tsuaj sai, ua rau cov dej xau los yog kev sib kis ntawm cov txheej txheem ntws. PTFE lub inert xwm zam cov teeb meem no kiag li, muab ib tug corrosion{72}}dawb tshav kub hloov chaw. Kev lag luam- tawm yog feem ntau hauv thermal conductivity. Vim tias PTFE ua kom muaj cua sov tsawg dua cov hlau, cov evaporators siv PTFE yuav tsum muaj qhov loj dua qhov chaw kom ua tiav qhov sib npaug ntawm cov hluav taws xob hloov pauv. Nrog kev tsim kom zoo, txawm li cas los xij, qhov kev txwv no tuaj yeem kov yeej. evaporation thawb cov cuab yeej hloov hluav taws xob mus rau nws qhov txwv, sib txuas cov cua kub kub, hloov theem, thiab cov khoom sib tw nyuaj. PTFE cov khoom siv hluav taws xob ua kom pom tau tias cov kev xav tau no tuaj yeem ua tau raws li cov khoom siv tau ua tib zoo. Los ntawm kev muab kev tiv thaiv corrosion, tswj tau qhov ntsuas tus cwj pwm, thiab kev ua tau zoo ntawm kev kub siab, PTFE-raws li cov txheej txheem qhib cov hauv kev tshiab rau kev tsom mus rau cov kua qaub. Rau kev lag luam nrhiav kom rov qab tau cov peev txheej lossis txo cov khoom pov tseg los ntawm cov kev daws teeb meem corrosive, qhov peev xwm no tuaj yeem muaj txiaj ntsig tshwj xeeb. Nrog rau thaj tsam txaus thiab kev xav txog kev tswj xyuas, PTFE cov khoom siv hluav taws xob tuaj yeem ua tiav cov txheej txheem evaporation nyob rau hauv ib puag ncig uas cov ntaub ntawv ib txwm ua sai sai.