Qhov ntsuas qhov ntsuas ntawm qhov ntsuas hluav taws xob hluav taws xob 0-100%LEL txhais li cas?
"LEL" yog hais txog kev txwv qis dua. Qhov qis tshaj plaws ntawm cov pa hluav taws xob uas tawg thaum ntsib hluav taws qhib hauv huab cua yog hu ua qhov kev txwv qis qis - luv luv li %LEL. Lus Askiv: Lower ExplosionLimited.
Qhov siab tshaj plaws ntawm cov pa hluav taws xob uas tawg thaum ntsib hluav taws qhib hauv huab cua yog hu ua qhov txwv siab tshaj ntawm kev tawg - luv luv li % UEL. Lus Askiv: UpperExplosion Limited.
Yog li dab tsi yog qhov kev txwv qis dua?
Tsis muaj kev phom sij yog tias qhov concentration ntawm cov pa hluav taws xob tsawg dhau lossis siab dhau. Nws yuav kub hnyiab los yog tawg tsuas yog thaum nws tov nrog huab cua los ua ib qho kev sib tov, los yog ntau precisely, thaum nws ntsib oxygen los tsim ib tug sib tov ntawm ib tug tej yam kev faib ua feem. Combustion yog ib qho kev ua phem oxidation tshwm sim nrog lub teeb thiab kub. Nws yuav tsum muaj peb yam: a. combustible khoom (gas); b. combustion pab (oxygen); c. ignition qhov chaw (kub). Lub combustion ntawm combustible gas yuav muab faib ua ob pawg. Ib qho yog diffusion combustion, uas yog, cov roj combustible uas volatilizes los yog ejects los yog leaks los ntawm cov khoom sib tov thiab hlawv thaum nws ntsib ib tug ignition qhov chaw. Lwm hom combustion yog thaum combustible gas thiab cua sib xyaw thiab ignite. Cov tshuaj tiv thaiv combustion no yog khaus thiab ceev, thiab feem ntau ua rau lub siab loj thiab lub suab, uas tseem hu ua tawg. Tsis muaj qhov sib txawv nruj ntawm kev sib tsoo thiab tawg.
Cov tuam tsev muaj cai lij choj thiab cov kws tshaj lij tau ua qhov kev ntsuas hluav taws xob thiab tawg ntawm cov pa hluav taws xob tam sim no nrhiav pom thiab tsim cov kev txwv tawg ntawm cov pa hluav taws xob, uas tau muab faib ua cov kev txwv siab tawg (UEL, cov ntawv luv luv rau kev tawg sab sauv txwv hauv lus Askiv) thiab txo qis kev txwv (cov ntawv luv. rau kev txwv qis qis, ua lus Askiv). LOJ?). Hauv qab qhov kev txwv qis qis, cov roj combustible hauv cov roj sib xyaw tsis txaus ua rau combustion lossis tawg; saum toj kawg nkaus txwv, cov pa oxygen hauv cov pa sib xyaw tsis txaus ua rau combustion lossis tawg. Tsis tas li ntawd, combustion thiab tawg ntawm combustible gas kuj muaj feem xyuam rau tej yam xws li roj siab, kub, thiab ignition zog. Cov kev txwv tawg feem ntau yog qhia nyob rau hauv cov nqe lus ntawm qhov ntim feem pua ntawm cov concentration.
Qhov kev txwv tawg yog ib lo lus dav dav rau qhov txwv kev tawg qis thiab qhov txwv qhov tawg. Kev tawg yuav tshwm sim tsuas yog thaum qhov concentration ntawm cov pa taws kub hnyiab hauv huab cua nyob nruab nrab ntawm qhov kev txwv qis qis thiab qhov txwv qhov tawg. Yuav tsis muaj qhov tawg hauv qab qhov kev txwv qis qis lossis siab tshaj qhov txwv kev tawg. Yog li ntawd, thaum ua kev ntsuas kev tawg, lub tswb nrov feem ntau yog teeb tsa qis dua 25% LEL ntawm qhov kev txwv qis dua.
Cov khoom siv hluav taws xob ruaj khov feem ntau muaj ob lub tswb ceeb toom (txog rau tus qauv ntawm lub tswb nrov): 10% LEL yog lub tswb, thiab 25% LEL yog lub tswb thib ob.
Portable combustible gas detectors feem ntau muaj lub tswb taw tes: 25% LEL yog lub tswb.
Piv txwv li, qhov qis tawg txwv ntawm methane yog 5% ntim piv. Qhov ntawd yog hais tias, faib qhov 5% ntim piv rau hauv ib puas qhov sib npaug thiab cia 5% ntim piv rau 100% LEL. Uas yog hais tias, thaum tus nqi ntes mus txog 10 Ntawm %LEL lub tswb taw tes, nws yog sib npaug rau cov ntsiab lus methane nyob rau lub sijhawm no yog 0.5% ntim piv. Thaum tus nqi ntes mus txog 25% LEL tswb taw tes, nws yog sib npaug rau cov ntsiab lus methane nyob rau lub sijhawm no yog 1.25% ntim piv.
Yog li ntawd, koj tsis tas yuav txhawj txog seb puas yuav muaj kev phom sij thaum twg los tau tom qab lub tswb. Qhov no yog ib qho kev ceeb toom rau koj kom ua raws li kev ntsuas tam sim ntawd, xws li tig lub kiv cua los yog txiav tawm qee qhov li qub, thiab lwm yam, uas nyob deb ntawm qhov qis qis ntawm kev tawg qhov twg muaj kev phom sij tshwm sim tiag tiag. Tseem muaj qhov sib txawv loj, kom nws tuaj yeem ua lub tswb ceeb toom.
