Kev Tshawb Fawb Txog Lub Sij Hawm Ntev -Lub Sijhawm Ua Tau Zoo Thiab Cov Yam Ntxim Saib Ntxim Ua Ntawm Hydrogen Thauj Los Ntawm Polyethylene Pipelines

Hydrogen, raws li lub zog tseem ceeb, tab tom ua lub luag haujlwm tseem ceeb hauv kev txhawb kev hloov pauv ntawm lub zog ntsuab. Nws tuaj yeem tsim tau siv cov hluav taws xob ntau dhau los ntawm cov khoom siv hluav taws xob txuas ntxiv thiab ua haujlwm tseem ceeb ntawm "Power-to-X" lub tswv yim zog. Nws tuaj yeem thauj los ntawm cov kav dej polymer uas twb muaj lawm. Txawm li cas los xij, hloov cov raj xa hluav taws xob mus rau cov ntawv thov kev thauj mus los hydrogen yuav tsum muaj kev ntsuam xyuas ntawm lawv cov luv-lub sij hawm thiab ntev- lub sij hawm cuam tshuam rau cov kav dej polymer, tshwj xeeb tshaj yog cov teeb meem ntsig txog hydrogen permeation thiab roj poob.
Cov kev tshawb fawb yav dhau los tau pom tias qhov luv - lub sij hawm cuam tshuam ntawm hydrogen ntawm cov kav dej polyethylene yog qhov txwv, tab sis nws ntev - lub sij hawm cuam tshuam - tshwj xeeb tshaj yog rau lub neej kev pab cuam ntawm cov kav dej - tsis tau tshawb xyuas tag nrho. Txoj kev tshawb no tsom mus rau kev ntsuas qhov kev hloov pauv hauv lub neej kev pabcuam ntawm PE100-RC yeeb nkab tom qab raug 8.9 bar hydrogen rau ob xyoos. Los ntawm kev sim cyclic crack rod test, nws tau pom tias CRB tsis ua haujlwm nkhaus tsuas pom qhov kev hloov me ntsis. Cov xwm txheej zoo sib xws kuj tau tshwm sim hauv lwm qhov PE100-RC yeeb nkab kuaj uas raug 10 bar dej siab rau 1000 teev. Cov kev hloov pauv tau pom nyob rau hauv qhov kev sim CRB thiab kev tiv thaiv qeeb qeeb kev nthuav tawm kev ua tau zoo tuaj yeem yog vim cov khoom siv morphology hloov pauv los ntawm lub siab, thiab tsis cuam tshuam nrog hydrogen raug nws tus kheej. Yog li ntawd, nws tuaj yeem txiav txim siab tias qhov raug hydrogen tsis muaj kev cuam tshuam loj heev rau kev tiv thaiv kev tawg qeeb qeeb thiab kev pabcuam lub neej ntawm cov kav dej polyethylene.
Raws li cov roj molecule tsawg tshaj plaws, qhov permeability ntawm hydrogen gas hauv PE kav yog kwv yees li plaub npaug ntawm cov roj poob piv rau cov roj ntuj. Hauv ib nrab -crystalline polymers, qhov permeability ntawm cov pa hauv crystalline theem yog qis dua li ntawm amorphous theem. Txhawm rau tshawb nrhiav kev sib raug zoo ntawm morphology ntawm polyethylene thiab nws cov permeability, pab pawg tshawb fawb tau tshuaj xyuas xya hom PE kav uas tsim los siv cov txheej txheem txhaj tshuaj sib txawv. Qhov sib txawv ntawm crystallinity ntsuas los ntawm infrared spectroscopy yog siab li 25%, tab sis cov permeability coefficient tsuas yog hloov los ntawm 13%, qhia tau hais tias cov cawv ntawm crystallinity ntawm hydrogen permeation kuj txwv. Kev nkag siab tob dua ntawm qhov kev sib raug zoo no yuav pab txhim kho kev tiv thaiv kev tiv thaiv -permeation kev ua tau zoo ntawm PE kav yav tom ntej thiab muab lub hauv paus theoretical rau qhov cuam tshuam ntawm cov khoom siv morphology hloov pauv ntawm tus cwj pwm permeation thaum lub sij hawm ntev - siv.