Cov txheej txheem txheej txheem ntawm lub tshuab nqus tsev siab viav vias adsorption (VPSA) cov txheej txheem cov pa oxygen yog qhov pib zoo ib yam li PSA. Qhov sib txawv tseem ceeb yog tias tom qab adsorption mus txog qhov sib npaug (adsorption saturation), txoj hauv kev uas cov nitrogen adsorbed nyob rau hauv cov pa-ua zeolite molecular sieve desorbed yog txawv.
Lub siab viav vias adsorption oxygen ntau lawm txheej txheem yog qhov tseem ceeb ntawm PSA txheej txheem. Cov txheej txheem VPSA, uas yog tam sim no siv dav tshaj plaws hauv kev tsim khoom, yog hom PSA txheej txheem. Rau cov txheej txheem ntau siv zeolite molecular sieve oxygen, cov khoom siv raw siv los tsim cov pa oxygen siv cov txheej txheem siab viav vias adsorption yog huab cua, uas tuaj yeem ua kom yooj yim ua binary sib xyaw ua ke ntawm cov pa thiab nitrogen. Lub zog adsorption ntawm nitrogen thiab oxygen ntawm zeolite molecular sieve yog txawv. Lub zog ntawm nitrogen ntawm zeolite molecular sieve yog ntau dua li cov pa oxygen, uas ua rau nitrogen yooj yim rau adsorbed ntawm zeolite molecular sieve dua li oxygen.
Nyob rau hauv isothermal tej yam kev mob, thaum lub pressurized cua dhau los ntawm cov pa-ua zeolite molecular sieve packing txheej nyob rau hauv lub adsorber (los yog ntauwd), qhov sib npaug adsorption tus nqi ntawm nitrogen yog ntau dua li cov pa oxygen. Nyob rau hauv nruab nrab thiab tsis tshua muaj siab, cov pa-ua zeolite molecular sieve nyiam adsorbs nitrogen, yog li cais cov pa thiab nitrogen. Thaum lub siab ntawm lub adsorber (los yog ntauwd) txo qis, qhov sib npaug ntawm qhov nqus ntawm nitrogen txo ntau dua li qhov sib npaug ntawm cov pa oxygen. Los ntawm kev siv cov yam ntxwv ntawm qhov adsorption ntawm nitrogen, oxygen thiab oxygen-tsim zeolite molecular sieve, cov adsorbed nitrogen yog desorbed los ntawm oxygen-tsim zeolite molecular sieve los ntawm kev txo lub siab los yog tshem tawm lub nqus tsev vacuum, yog li rov kho cov adsorption kev ua tau zoo ntawm cov pa oxygen- ua zeolite molecular sieve rau nitrogen. Nyob rau hauv txoj kev no, kev ua kom tsis tu ncua ntawm cov pa oxygen tuaj yeem ua tiav los ntawm kev siv 2 lossis ntau dua adsorbers (los yog cov yees) rau kev siv zog adsorption thiab decompressed desorption cyclic lag luam.
VPSA txheej txheem ntxiv lub tshuab nqus tsev twj piv rau cov txheej txheem PSA. Thaum cov pa oxygen-ua zeolite molecular sieve adsorbs nitrogen kom saturation, lub siab ntawm lub adsorber (los yog ntauwd) yog thawj zaug txo los ntawm venting, thiab tom qab ntawd lub tshuab nqus tsev twj tso kua mis yog tig rau ntxiv txo lub siab nyob rau hauv lub adsorber mus txog rau thaum nws nyob rau hauv qab ntawm lub venting. standard atmospheric siab. Los ntawm kev tswj xyuas qhov qis desorption siab, nitrogen adsorbed nyob rau hauv cov pa-tsim zeolite molecular sieve yog desorbed ntau dua, yog li txhim khu cov adsorption tus nqi ntawm nitrogen los ntawm cov pa-tsim zeolite molecular sieve tom qab regeneration, yog li txhim kho lub purity ntawm cov khoom oxygen. Los ntawm kev ntxiv cov khoom siv nqus tsev vacuum, VPSA txheej txheem tuaj yeem tsim cov pa oxygen siab dua purity dua li PSA cov cuab yeej ntawm tib lub teev, thiab cov pa oxygen ntau lawm ntawm cov cuab yeej tseem ntau dua, yog li cov txheej txheem VPSA tau dhau los ua kev siv dav dav siv lub zog viav vias adsorption oxygen ntau lawm txheej txheem. .
Lub tshuab nqus tsev siab viav vias adsorption (VPSA) cov txheej txheem tsim cov pa oxygen yog tsim los ntawm cov txheej txheem PSA oxygen.
Cov txheej txheem tseem ceeb ntawm VPSA cov txheej txheem tsim cov pa oxygen yog siab adsorption thiab lub tshuab nqus tsev desorption. Qhov sib txawv tseem ceeb ntawm nws thiab cov txheej txheem PSA yog tias lub tshuab nqus tsev vacuum (los yog lub tshuab nqus tsev twj) ntxiv rau cov pa roj tso tawm ntawm lub txaj adsorption. Nyob rau hauv cov txheej txheem kev khiav hauj lwm "step purge", lub tshuab nqus tsev twj tso kua mis yog pib nqus lub regeneration txaj thiab ntxuav cov khoom roj nyob rau tib lub sij hawm. Ob qhov kev ua haujlwm ntawm lub tshuab nqus tsev nce qhov desorption tus nqi thiab qib ntawm nitrogen hauv molecular sieve los ntawm lub tshuab nqus tsev.
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