Yog vim li cas molecular sieve inactivation nyob rau hauv purification system ntawm huab cua sib cais unit

1, cov nyhuv ntawm cov dej ntau dhau ntawm cov dej molecular sieve
Lub luag haujlwm tseem ceeb ntawm kev sib cais huab cua purifier yog tshem tawm cov dej noo thiab cov ntsiab lus hydrocarbon los ntawm huab cua los muab cov cua qhuav rau cov tshuab tom ntej. Cov khoom siv qauv yog nyob rau hauv daim ntawv ntawm kab rov tav bunk txaj, qis activated alumina filling qhov siab yog 590 hli, lub Upper 13X molecular sieve filling qhov siab yog 962 hli, thiab ob purifiers yog switched ntawm ib leeg. Ntawm lawv, activated alumina mas adsorbs dej nyob rau hauv cov huab cua, thiab molecular sieve siv nws molecular selective adsorption txoj cai rau adsorb hydrocarbons. Raws li cov khoom muaj pes tsawg leeg thiab adsorption zog ntawm molecular sieve, qhov kev txiav txim adsorption yog: H2O> H2S> NH3> SO2> CO2 (qhov kev txiav txim ntawm adsorption ntawm alkaline gases). H2O> C3H6> C2H2> C2H4, CO2, C3H8> C2H6> CH4 (kev txiav txim ntawm adsorption ntawm hydrocarbons). Nws tuaj yeem pom tias nws muaj qhov ua tau zoo tshaj plaws adsorption rau cov dej molecules. Txawm li cas los xij, cov dej ntsiab lus ntawm molecular sieve yog siab dhau, thiab cov dej dawb yuav tsim cov dej crystallization nrog molecular sieve. Qhov kub (220 ° C) muab los ntawm 2.5MPa chav siv rau qhov kub thiab txias tseem tsis tuaj yeem tshem tawm qhov no ntawm cov dej siv lead ua, thiab qhov pore loj ntawm molecular sieve yog nyob ntawm cov dej siv lead ua molecules, yog li nws tsis tuaj yeem txuas ntxiv mus rau adsorb hydrocarbons. Yog li ntawd, lub molecular sieve yog deactivated, kev pab cuam lub neej yog luv luv, thiab cov dej molecules nkag mus rau hauv lub low-pressure phaj kub exchanger ntawm lub rectification system, ua rau lub ntws channel ntawm tshav kub exchanger kom khov thiab thaiv, cuam tshuam rau lub airflow channel. thiab cov nyhuv hloov hluav taws xob ntawm cov khoom siv hluav taws xob, thiab hauv qhov xwm txheej hnyav, lub cuab yeej tsis tuaj yeem ua haujlwm li qub.
2. Cov nyhuv ntawm H2S thiab SO2 ntawm molecular sieve ua haujlwm
Vim qhov kev xaiv adsorption ntawm molecular sieve, ntxiv rau nws cov adsorption siab ntawm cov dej molecules, nws affinity rau H2S thiab SO2 kuj zoo dua nws adsorption kev ua tau zoo rau CO2. H2S thiab SO2 tuav lub active nto ntawm molecular sieve, thiab cov acidic Cheebtsam reacts nrog molecular sieve, uas yuav ua rau lub molecular sieve raug lom thiab deactivated, thiab lub peev xwm adsorption ntawm molecular sieve yuav txo. Kev pabcuam lub neej ntawm molecular sieve yog luv.
Hauv cov ntsiab lus, cov ntsiab lus noo noo ntau dhau, H2S thiab SO2 roj cov ntsiab lus nyob rau hauv lub qhov hluav taws xob cua ntawm cov cua sib cais cua txias ntauwd yog lub ntsiab yog vim li cas rau inactivation ntawm molecular sieve thiab lub shortening ntawm kev pab cuam lub neej. Los ntawm kev tswj nruj ntawm cov txheej txheem ntsuas, qhov sib ntxiv ntawm purifier qhov hluav taws xob noo noo ntsuas, tsim nyog xaiv cov hom fungicide, raws sij hawm kom muaj nuj nqis ntawm fungicide, dej txias ntauwd ntxiv dej nyoos, tsis tu ncua sampling tsom xam ntawm tshav kub exchanger to thiab lwm yam kev ntsuas, kev nyab xeeb thiab ruaj khov. kev ua haujlwm ntawm lub tshuab lim dej tuaj yeem ua si lub sijhawm tshawb nrhiav, ceeb toom raws sijhawm, lub hom phiaj hloov kho raws sijhawm, kom muaj txiaj ntsig ntau kom ntseeg tau tias kev siv molecular sieve efficiency.