"Ib lub tshuab nqus tsev distillation xav tau lub tshav kub exchanger kom condense vapors. PTFE yog zoo tagnrho rau cov corrosive condensate, tab sis nws puas yuav outgas nyob rau hauv lub nqus tsev vacuum? Nws puas tuaj yeem tiv taus qhov sib txawv ntawm qhov tsis sib tsoo? Dab tsi tshwj xeeb tsim tshwj xeeb yog xav tau rau kev pab cuam lub tshuab nqus tsev?" Cov lus nug no muaj nyob rau hauv lub tshuab nqus tsev ua lag luam uas cov tshuaj tiv thaiv yuav tsum tau ua ke nrog kev ua haujlwm ruaj khov nyob rau hauv qhov tsis tshua muaj siab. Txawm hais tias daim ntawv thov cuam tshuam nrog lub tshuab nqus tsev distillation, khov kom qhuav, lossis qhov chaw-simulation chambers, tus cwj pwm ntawm cov khoom siv hluav taws xob hloov pauv tau dhau los ua qhov tseem ceeb tshaj hauv cov tshuab cua.
Lub tshuab nqus tsev ua haujlwm hloov cov cai tsim
Kev khiav hauj lwm hauv lub tshuab nqus tsev hloov pauv li cas cov cuab yeej coj tus cwj pwm. Ntawm atmospheric siab, feem ntau cov cua sov exchangers yog tsim los rau sab hauv siab, corrosion kuj, thiab thermal efficiency. Hauv qhov chaw nqus tsev, txawm li cas los xij, qhov sib txawv ntawm qhov siab feem ntau ua rau qhov sib txawv. Es tsis txhob tiv thaiv sab hauv siab, tus exchanger yuav tsum tiv thaiv sab nraud siab uas sim ua kom cov hlab ntsha tawg, daim hlau, los yog nyias - cov phab ntsa.
Outgassing yog lwm qhov kev sib tw tseem ceeb. Hauv lub tshuab nqus tsev, txhua yam khoom siv maj mam tso cov pa hauv nruab nrog lossis cov pa paug. Txawm tias me me ntawm cov pa tawm tuaj yeem txo qhov nqus tau zoo, paug cov txheej txheem rhiab, lossis cuam tshuam nrog vapor condensation. Lub tshav kub exchanger uas ua tau zoo nyob rau hauv ib tug pa system tej zaum yuav muaj teeb meem thaum siv nyob rau hauv lub tshuab nqus tsev chamber los yog lub tshuab nqus tsev distillation unit.
Thermal cwj pwm kuj hloov pauv loj. Tsis muaj huab cua nyob ib puag ncig, convective cua sov hloov mus ploj. Thaum tshav kub kub hloov pauv nyob ntawm yuav luag tag nrho ntawm kev coj los ntawm cov phab ntsa exchanger thiab theem - hloov cov txheej txheem tshwm sim hauv cov hlab. Cov kev sib txawv no txhais tau hais tias lub tshuab hluav taws xob hloov hluav taws xob tsim nyog rau kev ua haujlwm hauv huab cua yuav tsis tuaj yeem ua haujlwm zoo hauv kev pabcuam lub tshuab nqus tsev.
Outgassing Cwj Pwm ntawm PTFE hauv Nqus Tsev
PTFE yog ib qho ntawm cov polymers ruaj khov tshaj plaws nyob rau hauv lub tshuab nqus tsev. Nws cov qauv molecular yog heev resistant rau tshuaj degradation, thiab nws muaj tsis muaj plasticizers los yog volatile additives uas yuav yooj yim evaporate nyob rau hauv qis siab. Raws li qhov tshwm sim, nws qhov kev tawm ntawm qhov nruab nrab yog qhov qis dua li ntawm ntau lwm yam khoom siv yas.
Txawm li cas los xij, txawm tias tsawg - cov khoom siv tawm tuaj yeem tsim teeb meem yog tias nws tsis tau npaj kom raug. PTFE qhov chaw tuaj yeem nqus tau me me ntawm cov dej noo los ntawm ib puag ncig, thiab cov molecules no yuav raug tso tawm thaum lub cev khiav tawm. Hauv siab - cov txheej txheem nqus tsev, qhov kev tso tawm no tuaj yeem ua kom lub twj tso kua mis qeeb - lub sijhawm thiab txo qhov kev ua haujlwm ntawm lub cev. Nyob rau hauv lub khov- tshuab ziab khaub ncaws, piv txwv li, qhov tsis xav tau outgassing tuaj yeem cuam tshuam qhov ruaj khov ntawm lub tshuab nqus tsev thaum lub voj voog ziab.
Qhov kev cuam tshuam yog qhov kev npaj tseem ceeb ntau npaum li kev xaiv cov khoom siv. Kev tu kom huv ua ntej kev teeb tsa thiab, thaum ua tau, lub tshuab nqus tsev ci ntawm qhov kub nruab nrab tuaj yeem txo qis kev tawm. Hauv ib puag ncig lub tshuab nqus tsev, txhua yam khoom siv hais los ntawm nws qhov kev tawm, thiab PTFE ua tau zoo thaum kho thiab ua haujlwm zoo.
Cov qauv kev ncaj ncees nyob rau sab nraud
Lub zog siv tshuab feem ntau yog qhov kev sib tw qis tshaj plaws thaum siv PTFE cov khoom siv hluav taws xob hauv lub tshuab nqus tsev. PTFE hloov pauv tau piv nrog cov hlau, uas ua rau nws tiv taus kev tawg thiab thermal kev nyuab siab tab sis kuj txhais tau hais tias nyias -cov phab ntsa PTFE tuaj yeem deform nyob rau hauv sab nraud.
Yog hais tias lub raj sab ntawm lub tshuab nqus tsev yog nyob rau hauv lub tshuab nqus tsev thaum lub plhaub sab tseem nyob ntawm atmospheric siab, cov hlab ntsha muaj zog compressive uas tuaj yeem ua rau tawg. Lub raj uas ua haujlwm zoo kawg nkaus ntawm lub siab ib txwm yuav ua tsis tiav thaum raug lub tshuab nqus tsev tag nrho. Qhov kev pheej hmoo no dhau los ua qhov tseem ceeb hauv kev sib pauv loj dua nrog qhov ntev, tsis muaj kev txhawb nqa lub raj ntev.
Tsim kom raug tshem tawm qhov kev pheej hmoo no. Thicker tube phab ntsa yog ib qho kev daws teeb meem, tshwj xeeb tshaj yog nyob rau hauv cov ntawv thov uas lub tshuab nqus tsev yog siab heev. Cov kev txhawb nqa sab hauv lossis cov raj luv luv kuj tuaj yeem txhim kho kev tiv thaiv kom tawg. Hauv qee lub tshuab, cov neeg tsim qauv nyiam lub siab- qhov sib npaug ntawm qhov sib npaug ntawm ob sab ntawm cov khoom sib hloov ua haujlwm nyob rau hauv cov qib siab zoo sib xws, txo cov kev ntxhov siab ntawm cov raj. Lub raj uas ua haujlwm ntawm atmospheric siab tuaj yeem tawg hauv lub tshuab nqus tsev-tsim raws li.
Thermal Performance in Vacuum Conditions
Lub tshuab nqus tsev ib puag ncig kuj hloov pauv hloov pauv li cas. Nyob rau hauv cov pa systems, convective tshav kub hloov nyob rau hauv ib puag ncig huab cua pab txhawb rau tag nrho cov thermal kev ua tau zoo. Nyob rau hauv lub tshuab nqus tsev, qhov no mechanism ploj tag nrho. Thaum tshav kub kub hloov tsheb yuav tsum vam khom los ntawm cov phab ntsa PTFE thiab kev sib cuag ncaj qha ntawm tus exchanger thiab cov qauv nyob ib puag ncig.
PTFE muaj cov thermal conductivity tsawg dua piv nrog cov hlau, uas txhais tau hais tias qhov chaw txaus txaus ua qhov tseem ceeb tshwj xeeb hauv kev siv lub tshuab nqus tsev. Cov neeg tsim qauv feem ntau them nyiaj los ntawm kev nce cov raj los yog ua kom zoo rau txoj kev ntws los txhim kho cov cua sov-hloov efficiency. Hauv lub tshuab nqus tsev distillation, piv txwv li, lub peev xwm los ua kom cov pa vapors tau zoo nyob tsis yog nyob ntawm cov khoom siv sib xws nkaus xwb tab sis kuj nyob ntawm qhov sib pauv cov cua kub zoo - hloov chaw.
Thermal stability yog lwm qhov zoo ntawm PTFE. Vim tias cov khoom siv tiv taus rau feem ntau cov corrosive condensates, nws tswj cov thermal ua haujlwm zoo txawm tias thaum tuav cov vapors hnyav uas yuav ua rau cov khoom siv hluav taws xob puas sai sai.
Kev xav txog kev siv tshuab nqus tsev vacuum
Kev siv tau zoo ntawm PTFE cua sov exchangers hauv lub tshuab nqus tsev yog nyob ntawm ob qho tib si tsim thiab kev npaj. Kev tsim siab yog ib qho ntawm thawj yam uas yuav tsum tau xav txog. Lub exchanger yuav tsum tau teev tseg rau tag nrho lub tshuab nqus tsev ua hauj lwm ntawm ob sab los yog rau ib tug configuration uas minimizes siab imbalance. Qhov no tiv thaiv tube deformation thiab ua kom ntev - lub sij hawm cia siab.
Outgassing tswj yuav tsum yog ib feem ntawm cov txheej txheem installation. Ntxuav lub exchanger kom huv si ua ntej kev teeb tsa tshem tawm cov kab mob ntawm qhov chaw uas tuaj yeem tso cov pa tawm hauv lub tshuab nqus tsev. Hauv cov ntawv thov xav tau ntau dua, tswj cov cua sov hauv qab lub tshuab nqus tsev tuaj yeem txo cov roj seem thiab txhim kho kev ua haujlwm.
Kev xaiv cov khoom siv kuj ua lub luag haujlwm. Virgin PTFE feem ntau muab cov nqi qis tshaj tawm thiab cov tshuaj purity siab tshaj plaws. Cov qib PTFE puv tuaj yeem tsim nyog hauv qee cov ntawv thov kev lag luam, tab sis nyob rau hauv siab - lub tshuab nqus tsev ib puag ncig lawv tuaj yeem tso cov pa roj ntau dua lossis cov khoom paug ntau dua li PTFE ntshiab.
Thaum kawg, txoj kev ncaj ncees los ua qhov tseem ceeb. Txawm tias me me tuaj yeem cuam tshuam lub tshuab nqus tsev. Helium leak testing feem ntau yog siv nyob rau hauv lub tshuab nqus tsev vacuum industries los xyuas kom meej tias cov ntsaws ruaj ruaj thiab kev twb kev txuas nyob twj ywm nruj nyob rau hauv qis - tej yam kev mob siab.
Xaus
PTFE heat exchangers tuaj yeem ua tau zoo hauv qhov chaw nqus tsev thaum lawv tsim thiab npaj kom zoo rau cov xwm txheej tshwj xeeb. Lawv cov khoom siv hluav taws xob tsawg tsawg, cov tshuaj tiv thaiv zoo heev, thiab thermal stability ua rau lawv zoo rau lub tshuab nqus tsev distillation, khov- tshuab ziab khaub ncaws, thiab cov tshuab nqus tsev tshwj xeeb. Txawm li cas los xij, kev vam meej yog nyob ntawm kev ua tib zoo saib xyuas qhov sib txawv ntawm qhov sib txawv, kev tsim qauv, thiab kev tswj kev tawm tsam.
Thaum cov xwm txheej no tau hais txog, PTFE cov khoom siv hluav taws xob muaj kev sib xyaw ua ke tsis tshua muaj kev tiv thaiv corrosion thiab lub tshuab nqus tsev sib raug zoo. Qhov no ua rau lawv muaj txiaj ntsig tshwj xeeb hauv cov txheej txheem uas ob qho tib si tshuaj lom neeg ruaj khov thiab kev ua haujlwm nqus tsev vacuum yog qhov tseem ceeb -ib daim ntawv thov niche uas ob peb cov ntaub ntawv tuaj yeem ua tau raws li kev ntseeg siab.
