Yuav ua li cas ntxuav lub PTFE Thaum tshav kub kub Exchanger yam tsis muaj kev puas tsuaj

Tom qab lub hlis ntawm kev pab cuam, lub siab poob ntawm PTFE tshav kub exchanger nce 30% thiab cov zis kub txo. Scale formation ntawm lub raj nplaim. Kev tu neeg kho tshuab yog qhov txaus ntshai, tshuaj ntxuav (CIP) yog cov lus teb. Tab sis cov tshuaj tsis raug lossis qhov kub thiab txias tuaj yeem rhuav tshem PTFE. Yuav ua li cas ntxuav kom nyab xeeb thiab zoo.

Yog vim li cas tshuaj ntxuav yog nyiam

PTFE heat exchangers yog tsim rau cov xwm txheej corrosive. Vim lawv cov tshuaj tsis haum, lawv tsim nyog rau kev huv huv - hauv - Qhov chaw (CIP) cov txheej txheem. Kev ntxuav tshuaj tshem tawm cov khoom pov tseg yam tsis muaj kev puas tsuaj rau lub cev, txawm li cas los xij kev tu txhua yam tuaj yeem txhuam los yog deformed PTFE nto.

Tshuaj tiv thaiv tsis hais txog tshuaj tiv thaiv kab mob. PTFE yog resistant rau feem ntau cov acids, bases thiab cov kuab tshuaj. Txawm li cas los xij, qee cov tshuaj lom neeg, tshwj xeeb tshaj yog muaj zog oxidising acids ntawm qhov kub siab dua xws li fuming nitric acid lossis molten alkali, tuaj yeem ua rau lub sijhawm ntev ntawm cov khoom. PTFE yog qhov ruaj khov, tab sis nws tsis tuaj yeem rhuav tshem tau - xyuas daim ntawv qhia tshuaj lom neeg ua ntej koj xaiv tus neeg saib xyuas.

Kev npaj thiab kev sib cais ntawm tus exchanger

Thawj kauj ruam ntawm kev ntxuav yog cais kom raug. Tag nrho cov txheej txheem yuav tsum tau muab cais tawm ntawm cov txheej txheem los tiv thaiv kev sib kis thiab tiv thaiv tus neeg teb xov tooj. Ob lub plhaub sab thiab lub raj sab yuav tsum tau muab pov tseg kom zoo ntawm tag nrho cov txheej txheem ua kua.

Thaum lub sij hawm tu, kev sib cais li qub yuav tsum tau muab xauv tawm thiab, yog tias xav tau, kaw cov kaw kom tiv thaiv kev sib tsoo ntawm cov txheej txheem xov xwm. Qhov no ua kom ntseeg tau tias cov tshuaj ntxuav tau zoo nyob hauv ib puag ncig tswj.

Xaiv tus neeg saib xyuas kom raug

Txoj kev vam meej ntawm CIP feem ntau hinges ntawm kev xaiv cov tshuaj ntxuav tu rau hom fouling ntsib. Feem ntau, deposits nyob rau hauv lub tshav kub exchangers yuav muab faib ua peb pawg: mineral scale, organic fouling thiab lom kev loj hlob.

Mineral scale suav nrog cov khoom xws li calcium carbonate lossis hlau oxides. Cov kua qaub me me yog qhov zoo ntawm kev tshem tawm cov ntxhia pob zeb. Citric acid los yog acetic acid daws ntawm 5-10% feem ntau yog ua hauj lwm vim hais tias lawv ua tau zoo thiab kuj benign rau PTFE thiab lwm yam ntaub ntawv.

Cov roj, roj lossis cov khoom siv polymer residues yog cov organic deposits thiab yuav tsum tau ntxuav alkaline. Ib qho 1-2% tov ntawm caustic soda los yog ib tug tsim alkaline detergent yuav ua tiav cov tshuaj no.

Biological fouling xws li biofilms lossis microbial kev loj hlob, piv txwv li, yuav xav tau cov tshuaj dawb tsis muaj zog lossis hydrogen peroxide. Kev ntsuas kev sib raug zoo yuav tsum tau muaj nyob rau hauv cov xwm txheej no vim tias cov oxidizers tuaj yeem cuam tshuam tsis yog PTFE nkaus xwb tab sis kuj tseem muaj cov khoom siv thiab cov khoom siv.

Ua Cov Tshuaj Ntxuav

Tom qab xaiv cov tshuaj zoo, cov tshuaj yuav tsum tau ua ntawm qhov tsim nyog concentration thiab kub. "Qhov kub yog ib qho tseem ceeb ntawm kev tu kom zoo, tab sis yuav tsum tau tswj kom zoo.

Kev ntxuav kub ntau rau PTFE cov khoom siv hluav taws xob feem ntau yog 40-60 degree. Qhov no muab cov tshuaj muaj zog txaus tsis muaj thermal stress ntau dhau. Qhov kub tu yuav tsum tsis muaj qhov xwm txheej siab tshaj 80 degree, vim tias qhov kub thiab txias tau ntev ntev yuav ua rau cov khoom tawg.

Cov tshuaj yuav tsum tau muab sib xyaw kom zoo thiab txhaj rau hauv lub voj voog tshwj xeeb CIP kom tswj tau qhov sib xws thaum lub sijhawm ntxuav.

Ntxuav txheej txheem & ncig ntawm

Cov tshuaj ntxuav yog cycled los ntawm kev txom nyem ntawm lub exchanger, plhaub sab los yog raj sab, nrog ib tug CIP twj tso kua mis. Tus nqi ntws yog qhov tseem ceeb. Nws yuav tsum muaj siab txaus los tsim cov turbulent flow uas nyiam kev sib cuag ntawm cov tshuaj nrog cov fouling txheej tab sis tsis siab dhau los ua kom muaj kev ntxhov siab.

Raws li txoj cai ntawm tus ntiv tes xoo ntws nrawm yuav tsum tau khaws cia hauv qab li 2 m / sec kom txo cov raj vibration lossis kev puas tsuaj. Kev ruaj khov, tswj kev ncig ua kom zoo ib yam kev tu thiab tsis ua kom tsis muaj zog ntawm kev sib hloov.

Lub sij hawm ntxuav yog nyob ntawm qhov℃ntawm fouling. Lub teeb tso nyiaj tuaj yeem ntws tawm hauv ib teev, tab sis cov nyiaj tso nyiaj loj dua yuav xav tau txog li plaub teev ntawm kev ncig. Kev saib xyuas yog qhov tseem ceeb hauv theem no. Cov kev hloov pauv hauv kev poob siab thoob plaws lub exchanger tuaj yeem ua qhov qhia txog kev nce qib, vim tias tsis muaj kev tiv thaiv tsawg dua txhais tau tias cov deposits raug yaj.

Qee zaum, kev ua piv txwv cov tshuaj ntxuav kom pom ntau dua. Kev lees paub ntawm kev tshem tawm ntawm fouling tuaj yeem ua los ntawm kev nce qib ntawm cov khoom tawg lossis cov xim hloov.

Rinsing thiab Neutralization

Thaum kawg ntawm lub voj voog tu lub exchanger yuav tsum tau drained thiab ntxuav kom huv si. Circulating dej huv, zoo dua de-ionised, flushes tej seem ntawm tus neeg saib xyuas.

Kev yaug yuav tsum tau txuas ntxiv mus kom txog thaum cov dej ntws mus ua nruab nrab hauv pH. Qhov no yog ib qho tseem ceeb kauj ruam Residual acid los yog alkali seem nyob rau hauv lub exchanger yuav induce corrosion ntawm downstream khoom los yog cuam tshuam cov txheej txheem thaum lub kaw lus rov pib dua. Yaug kom txog thaum nruab nrab pH, cov tshuaj ntxuav tas li yog ib qho phom sij zais.

Tshawb xyuas kev huv

Kev pov thawj yuav ua pov thawj tias cov txheej txheem ntxuav tau ua tiav nws lub hom phiaj. Txoj hauv kev ua tau zoo tshaj plaws yog los saib xyuas kev poob siab thoob plaws hauv qhov sib pauv thiab sib piv nrog cov txiaj ntsig hauv paus. Rov qab mus rau qhov qub kev poob siab txhais tau hais tias cov kev txwv ntws tau raug tshem tawm.

Ib lub borescope tuaj yeem siv rau kev kuaj pom ntawm sab hauv ntawm cov hlab rau kev tshuaj xyuas ntau dua. Qhov no yog qhov tseem ceeb tshwj xeeb hauv cov ntawv thov tseem ceeb uas yuav tsum tau ua kom huv huv.

Yog tias kev ua haujlwm tsis zoo tag nrho, yuav tsum muaj lub voj voog ntxuav thib ob. Rau qhov hnyav lossis sib xyaw fouling, ob -kauj ruam tu, piv txwv li kev ntxuav kua qaub ua raws li kev ntxuav alkaline, tuaj yeem ua tau zoo dua.

Cov ntaub ntawv kev nyab xeeb

"Cov txheej txheem kev nyab xeeb nruj yuav tsum tau ua raws li thaum tuav cov tshuaj ntxuav. Cov neeg ua haujlwm yuav tsum siv cov khoom tiv thaiv tus kheej kom zoo, xws li hnab looj tes tiv thaiv tshuaj, tsom iav kev nyab xeeb thiab acid resistant apron.

Kev ua pa kom txaus yuav tsum tau muab los tiv thaiv kom tsis txhob muaj cov pa paug, tshwj xeeb tshaj yog thaum cuam tshuam nrog cov tshuaj tsis haum lossis oxidizing. Kev tiv thaiv kev nchuav thiab cov khoom siv thaum muaj xwm txheej ceev yuav tsum muaj yooj yim.

Siv cov tshuaj ntxuav tu ua ntej muab pov tseg kom ua raws li cov cai hauv cheeb tsam ib puag ncig. Kev tuav thiab cov ntaub ntawv yog qhov tseem ceeb rau kev nyab xeeb thiab ua raws.

Kev puas tsuaj dawb kev ua haujlwm rov qab los

Kev tu tshuaj yog qhov zoo tshaj plaws tu txheej txheem rau PTFE tshav kub exchangers raws li nws tshem tawm cov deposits yam tsis muaj kev qhia txog kev siv txhua yam. Thaum ua tau zoo, CIP rov ua kom cov cua sov hloov pauv tau zoo, txo qis kev poob siab thiab txuas ntxiv lub neej ntawm cov cuab yeej.

Tswj txoj hauv kev - xaiv cov tshuaj tsim nyog, tswj qhov kub thiab txias thiab ua kom tiav cov dej yaug - khaws cia PTFE thaum ua kom zoo tu. Nrog rau kev qhuab qhia rau kev saib xyuas cov neeg ua haujlwm fouling teeb meem yuav daws tau zoo thiab cov khoom sib pauv rov qab mus rau qhov ua tau zoo yam tsis muaj kev pheej hmoo.