Bipolar phaj yog lub hauv paus tseem ceeb ntawm lub reactor, uas muaj kev cuam tshuam loj heev rau kev ua haujlwm thiab tus nqi ntawm lub reactor. Tam sim no, bipolar phaj feem ntau yog muab faib ua graphite phaj, composite phaj thiab hlau phaj raws li cov khoom siv.
Phaj bipolar yog ib qho ntawm cov khoom tseem ceeb ntawm PEMFC, nws lub luag haujlwm tseem ceeb yog thauj cov roj hla lub tshav pob ntawm qhov chaw ntws, sau thiab coj cov tam sim no, cua sov thiab dej uas tsim los ntawm cov tshuaj tiv thaiv. Nyob ntawm hom khoom siv, qhov hnyav ntawm PEMFC pawg yog li 60% txog 80% thiab tus nqi yog li 30%. Raws li qhov yuav tsum tau ua haujlwm ntawm phaj bipolar, thiab xav txog qhov chaw ua haujlwm electrochemical acidic ntawm PEMFC, phaj bipolar yuav tsum muaj qhov yuav tsum tau ua siab rau kev ua hluav taws xob, cua nruj, cov khoom siv kho tshuab, kev tiv thaiv corrosion, thiab lwm yam.
Raws li cov ntaub ntawv, ob chav phaj feem ntau muab faib ua peb pawg: graphite phaj, composite phaj, hlau phaj, graphite ob chav phaj yog qhov feem ntau siv tam sim no hauv tsev PEMFC ob chav phaj, hluav taws xob conductivity, thermal conductivity, zoo stability thiab corrosion tsis kam thiab lwm yam kev ua tau zoo, tab sis cov khoom siv kho tshuab tsis zoo, brittle, machining nyuaj ua rau muaj teeb meem nqi siab los ntawm ntau lub tuam txhab.
Cov xim avphaj bipolarkev taw qhia:
Cov phaj bipolar ua los ntawm graphite muaj kev ua hluav taws xob zoo, kev ua cua sov zoo thiab kev tiv thaiv corrosion, thiab yog cov phaj bipolar feem ntau siv hauv PEMFCS. Txawm li cas los xij, nws qhov tsis zoo kuj pom tseeb dua: qhov kub ntawm graphite ntawm phaj graphite feem ntau siab dua 2500 ℃, uas yuav tsum tau ua raws li cov txheej txheem cua sov nruj, thiab lub sijhawm ntev; Cov txheej txheem machining qeeb, lub voj voog ntev, thiab qhov tseeb ntawm lub tshuab siab, ua rau tus nqi ntawm phaj graphite siab; Graphite tsis yooj yim tawg, phaj tiav lawm yuav tsum tau ua tib zoo tuav, sib dhos nyuaj; Graphite yog porous, yog li cov phaj yuav tsum tau ob peb millimeters tuab kom cov pa roj sib cais, ua rau cov khoom siv qis dua, tab sis cov khoom tiav lawm hnyav dua.
Kev npaj ntawm graphitephaj bipolar：
Cov toner lossis hmoov graphite sib xyaw nrog cov graphitized resin, nias ua, thiab graphitized ntawm qhov kub siab (feem ntau ntawm 2200 ~ 2800C) hauv huab cua txo qis lossis nyob rau hauv qhov chaw nqus tsev. Tom qab ntawd, lub phaj graphite raug impregnated kom kaw lub qhov, thiab tom qab ntawd lub tshuab tswj lej siv los ua cov pa roj uas xav tau ntawm nws qhov chaw. KEV GRAPHITIZATION KUB SIAB THIAB KEV UA KOM COV GAS CHANNEL YOG COV YAM TSEEM CEEB RAU TUS NQI NTAU NTAWM BIPOLAR PHAJ, NROG KEV UA KOM TXOG LI 60% NTAWM TAG NRHO TUS NQI ROG.
Phaj Bipolaryog ib qho ntawm cov khoom tseem ceeb tshaj plaws hauv cov roj teeb. Nws cov haujlwm tseem ceeb yog raws li nram no:
1, Kev sib txuas roj teeb ib zaug xwb
2, Xa roj (H2) thiab cua (02)
3. Kev sau thiab kev sib txuas tam sim no
4, Kev txhawb nqa pawg thiab MEA
5, Tshem tawm cov cua sov uas tsim los ntawm cov tshuaj tiv thaiv
6, Nqus cov dej uas tsim tawm hauv cov tshuaj tiv thaiv
Lub sijhawm tshaj tawm: Lub Xya Hli-29-2022