Txoj Cai ntawm PSA Nitrogen Generation
Cov pa roj carbon molecular sieves muaj peev xwm ntawm ib txhij adsorbing ob qho tib si oxygen thiab nitrogen los ntawm huab cua; Tsis tas li ntawd, lawv lub peev xwm adsorption nce thaum siab nce. Txawm li cas los xij, tsis muaj qhov sib txawv tseem ceeb ntawm qhov sib npaug adsorption muaj peev xwm ntawm oxygen thiab nitrogen. Yog li ntawd, nws yog qhov nyuaj kom ua tiav qhov kev sib cais zoo ntawm oxygen thiab nitrogen raws li kev hloov pauv siab. Txawm li cas los xij, los ntawm kev noj adsorption kinetics- tshwj xeeb, tus nqi adsorption- rau hauv tus account, cov yam ntxwv adsorption ntawm oxygen thiab nitrogen tuaj yeem sib txawv zoo. Oxygen molecules muaj ib txoj kab uas hla me dua nitrogen molecules; yog li ntawd, lawv qhov diffusion tus nqi yog ob peb puas npaug sai dua li ntawm nitrogen. Yog li ntawd, carbon molecular sieves adsorb oxygen sai heev, ncav cuag tshaj 90% ntawm lawv lub peev xwm adsorption li ntawm ib feeb. Nyob rau tib lub sijhawm, qhov adsorption uptake rau nitrogen tsuas yog nyob ib ncig ntawm 5%. Yog li ntawd, cov khoom adsorbed nyob rau lub sij hawm luv luv no feem ntau yog cov pa oxygen, thaum cov pa roj uas tseem tshuav -qhov tsis muaj adsorbed- muaj feem ntau ntawm nitrogen. Yog li, los ntawm kev txwv lub sijhawm adsorption tsawg dua ib feeb, kev sib cais ua ntej ntawm oxygen thiab nitrogen tuaj yeem ua tiav. Hauv qhov tseem ceeb, cov txheej txheem ntawm adsorption thiab desorption yog tsav los ntawm kev sib txawv ntawm lub siab- adsorption tshwm sim thaum lub siab nce, thiab desorption tshwm sim thaum lub siab txo. Qhov sib txawv ntawm cov pa thiab nitrogen, txawm li cas los xij, nyob ntawm qhov tsis sib xws hauv lawv cov adsorption tus nqi thiab ua tiav los ntawm kev tswj hwm lub sijhawm adsorption; Los ntawm kev ua kom lub sij hawm luv luv no, oxygen yog tag nrho adsorbed, thaum cov txheej txheem adsorption raug tso tseg ua ntej nitrogen muaj sijhawm txaus los ua adsorbed.
Lub hauv paus ntsiab lus ntawm Cryogenic Cua Sib cais rau Nitrogen Generation
Cryogenic nitrogen tiam tshuab muaj peev xwm ua tsis tau tsuas yog gaseous nitrogen tab sis kuj ua kua nitrogen, yog li txaus siab cov txheej txheem uas tshwj xeeb hu rau cov kua nitrogen. Tsis tas li ntawd, cov kua nitrogen uas tsim tawm tuaj yeem khaws cia rau hauv lub tank tshwj xeeb. Nyob rau hauv cov xwm txheej ntawm kev xav tau nitrogen tsis tu ncua lossis thaum lub sijhawm tu me me ntawm chav sib cais huab cua, cov kua nitrogen khaws cia hauv cov tso tsheb hlau luam tuaj yeem raug coj mus rau hauv vaporizer, rhuab, thiab tom qab ntawd muab tso rau hauv cov khoom siv nitrogen kom ua tau raws li cov cai nitrogen ntawm cov txheej txheem hauv qab. Lub voj voog ua haujlwm ntawm cov nroj tsuag cryogenic nitrogen (txhais tau tias yog lub sijhawm nruab nrab ntawm ob qhov sov sov- mus txog) feem ntau spans ntau tshaj ib xyoos; yog li ntawd, nws yog feem ntau pom tias tsis tsim nyog los muab ib qho kev tshwj xeeb thaub qab rau cov tshuab cryogenic. Nyob rau hauv sib piv, Pressure Swing Adsorption (PSA) systems muaj peev xwm ua tau tsuas yog gaseous nitrogen thiab tsis muaj xws li backup peev xwm; yog li ntawd, ib chav PSA nkaus xwb tsis tuaj yeem lav tsis tu ncua, ntev - ua haujlwm ntev yam tsis muaj kev cuam tshuam.
Txoj Cai ntawm Membrane Air Separation rau Nitrogen Generation
Tom qab compressed thiab lim, huab cua nkag mus rau hauv lub polymeric membrane cais chav tsev. Vim hais tias ntau yam gases muaj sib txawv solubilities thiab diffusion coefficients nyob rau hauv cov ntaub ntawv membrane, lawv qhia txawv tus txheeb ze permeation tus nqi raws li lawv dhau los ntawm daim nyias nyias. Raws li cov yam ntxwv no, cov pa roj tuaj yeem muab faib ua ob pawg: "gas ceev" thiab "slow gases." Thaum cov roj sib xyaw ua rau muaj qhov sib txawv ntawm qhov sib txawv ntawm daim nyias nyias, cov pa roj nrog cov permeation nrawm heev -xws li dej, hydrogen, helium, hydrogen sulfide, thiab carbon dioxide- dhau los ntawm daim nyias nyias thiab ua kom nplua nuj nyob rau sab permeate. Hloov pauv, cov pa roj uas muaj qhov qis dua qis dua-xws li methane, nitrogen, carbon monoxide, thiab argon- tau khaws cia thiab ua kom muaj txiaj ntsig zoo nyob rau sab retentate ntawm daim nyias nyias, yog li ua tiav qhov sib cais ntawm cov roj sib tov.