0-100 feem pua LEL thiab 0-n PPM hauv lub tswb ntsuas roj
(1) "LEL" yog hais txog qhov kev txwv qis dua. Qhov qis tshaj plaws ntawm cov pa hluav taws xob hauv huab cua thaum nws ntsib qhov qhib nplaim tawg yog hu ua qhov kev txwv qis qis - luv luv li feem pua LEL. Lus Askiv: Lower Explosion Limited.
Yog li dab tsi yog qhov kev txwv qis dua?
Nws tsis yog qhov txaus ntshai yog tias qhov concentration ntawm cov pa hluav taws xob tsawg dhau los yog siab dhau. Nws yuav kub hnyiab los yog tawg tsuas yog thaum nws tov nrog huab cua los ua ib tug sib tov los yog ntau precisely thaum nws ntsib oxygen los tsim ib tug tej yam feem ntawm cov sib tov. combustion yog ib qho kev ua phem oxidation nrog lub teeb thiab kub, thiab nws yuav tsum muaj peb yam:
a. Combustibles (gas);
b. Kev them nyiaj yug combustion (oxygen);
c, ignition qhov chaw (kub).
combustion ntawm combustible gas yuav muab faib ua ob pawg
Ib qho yog diffusion combustion, uas yog, lub volatile los yog ejected los yog leaked combustible gas los ntawm cov cuab yeej yuav sib tov thiab hlawv thaum ntsib ib tug ignition qhov chaw.
Lwm hom combustion yog combustion ntawm combustible gas thiab cua sib xyaw nrog cua. Cov tshuaj tiv thaiv combustion no yog khaus thiab ceev, thiab feem ntau ua rau lub siab loj thiab lub suab, tseem hu ua tawg.
Tsis muaj qhov sib txawv nruj ntawm kev kub hnyiab thiab tawg. Cov tuam tsev tso cai thiab cov kws tshaj lij tau ua kom tawg thiab tawg tshuaj ntsuam xyuas qhov pom cov pa hluav taws xob, thiab tsim cov roj hluav taws xob tawg, uas tau muab faib ua cov kev txwv siab tawg (UEL rau sab sauv tawg txwv hauv lus Askiv) thiab txo qis kev txwv (cov ntawv luv rau kev tawg qis. limit in English). LEL). Hauv qab qhov kev txwv qis qis, cov ntsiab lus ntawm cov roj combustible hauv qhov sib tov tsis txaus ua rau combustion lossis tawg, thiab saum toj kawg nkaus txwv, cov ntsiab lus ntawm cov pa oxygen hauv qhov sib tov tsis txaus thiab tsis tuaj yeem ua rau combustion lossis tawg. Tsis tas li ntawd, combustion thiab tawg ntawm combustible gas kuj muaj feem xyuam rau lub siab, kub, ignition zog thiab lwm yam ntawm cov roj. Qhov kev txwv tawg feem ntau yog qhia nyob rau hauv ntim feem pua concentration. Qhov kev txwv tawg yog ib lo lus dav dav rau qhov txwv kev tawg qis thiab qhov txwv qhov tawg. Qhov concentration ntawm cov roj combustible nyob rau hauv cov huab cua yuav tsuas yog tawg thaum lub concentration ntawm cov combustible gas nyob nruab nrab ntawm qhov tsawg tawg txwv thiab lub siab tawg txwv. Tsis muaj qhov tawg yuav tshwm sim hauv qab qhov kev txwv qis dua lossis siab tshaj qhov txwv qhov tawg. Kev ntsuas ntau ntawm ntau yam khoom siv hluav taws xob hluav taws xob yog 0-100 feem pua LEL.
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 feem pua LEL yog lub tswb thib ib, thiab 25 feem pua LEL yog lub tswb thib ob. Portable combustible gas detectors feem ntau muaj lub tswb taw tes: 25 feem pua LEL yog lub tswb taw tes. Piv txwv li, qhov kev txwv qis ntawm methane yog 5 feem pua ntawm qhov sib piv, uas yog hais tias, qhov 5 feem pua ntawm qhov sib piv tau muab faib ua ib puas qhov sib npaug, yog li ntawd 5 feem pua ntawm qhov sib npaug sib npaug rau 100 feem pua LEL, uas yog, thaum lub tus nqi ntes tau nce mus txog 10 Thaum qhov feem pua ntawm LEL tswb taw tes, nws yog sib npaug rau cov ntsiab lus methane ntawm 0.5 feem pua ntawm qhov ntim. Thaum tus nqi ntes mus txog 25 feem pua ntawm LEL lub tswb, nws yog sib npaug rau cov ntsiab lus methane ntawm 1.25 feem pua ntawm qhov ntim. Yog li ntawd, koj tsis tas yuav txhawj xeeb txog seb puas muaj kev phom sij thaum twg los tau tom qab lub tswb. Lub sijhawm no, nws tseem ceeb rau koj kom ua raws li cov kev ntsuas tam sim ntawd, xws li tig lub kiv cua los yog txiav tawm qee qhov li qub, thiab lwm yam, kom tsis txhob muaj qhov tshwm sim tiag tiag ntawm kev tawg txaus ntshai. Tseem muaj qhov sib txawv loj, yog li nws yuav ua lub luag haujlwm ntawm lub tswb nrov.
(2) ppm yog qhov ntim piv concentration: Qhov ib lab.
①ppm yog ib txoj kev qhia txog qhov concentration ntawm cov tshuaj (qhov loj feem ntawm cov solute), thiab ppm txhais tau tias ib feem ntawm ib lab.
Rau kev daws: uas yog, 1/1000 ml ntawm solute hauv 1 liter ntawm aqueous tov, ces nws cov concentration (solute pawg feem) yog 1 ppm.
②Rau cov pa roj: ib txoj hauv kev sawv cev rau qhov concentration ntawm cov pa phem nyob rau hauv cov huab cua puag ncig (cua).
Volume concentration notation: qhov ntim ntawm cov pa paug muaj nyob rau hauv ib lab ntim ntawm huab cua, los yog ppm
Cov roj concentration ntsuas los ntawm cov cuab yeej ntsuas roj feem ntau yog ntim concentration (ppm). Raws li kuv lub teb chaws cov kev cai, tshwj xeeb tshaj yog lub tuam tsev tiv thaiv ib puag ncig, cov roj concentration yuav tsum tau qhia nyob rau hauv units ntawm huab hwm coj concentration (piv txwv li: mg / m3), thiab peb lub teb chaws tus qauv specifications kuj qhia nyob rau hauv units ntawm loj concentration (piv txwv li: mg. /m³;).
