Ua ntej ntawm tag nrho cov, cia peb nrov lub tswb ntawm lub combustible gas tswb system, teem nws li: lub neej ntawd tsis pub tsawg tshaj li 25 feem pua LEL (5 feem pua LEL ~ 40 feem pua LEL yog adjustable); lub neej ntawd siab txwv yog 50 feem pua LEL (10 feem pua LEL ~ 100 feem pua LEL adjustable).
Kev ntsuas ntau ntawm lub tswb hluav taws xob hluav taws xob yog 0 ~ 100 feem pua LEL. Raws li lub teb chaws txoj cai, lub tswb qis feem ntau yog teeb tsa ntawm 15 feem pua LEL ~ 25 feem pua LEL, thiab lub tswb nrov feem ntau yog teem rau 50 feem pua LEL. Feem ntau ntawm cov hluav taws xob hluav taws xob hluav taws xob tam sim no Lub tswb ntsuas qis yog teem rau 25 feem pua LEL. 100 feem pua LEL ntawm no yog hais txog qhov tawg txwv tus nqi ntawm cov roj, uas yog hais tias, thaum lub tswb hluav taws xob hluav taws xob qhia 100 feem pua LEL, qhov kev txwv qis ntawm cov roj hluav taws xob tau mus txog.
Tam sim no koj yuav tsum paub seb cov roj twg uas tau sim cov roj combustible yog rau. Cov feem ntau yog methane, isobutane, propane, hydrogen, benzene, ketones, alcohols, thiab lwm yam. Tom ntej no, txiav txim siab qhov concentration ntawm cov pa yuav tsum tau kuaj. Feem ntau, qhov kev txwv qis qis (feem pua LEL) raug kuaj pom nyob rau hauv feem ntau. Lus Cim: Qhov qis qis qis ntawm cov pa roj sib txawv txawv, xws li 1.8 feem pua rau isobutane thiab 5 feem pua rau methane. Kuj tseem muaj qee qhov kuaj tau ppm (ib lab) qib, 1 feem pua =10000ppm. Yog tias nws yog feem pua LEL, qhov ntau yog 0-100 feem pua LEL; yog tias nws yog ppm, nws feem ntau yog 0-100ppm lossis 0-1000ppm.
Cov ntawv ceeb toom qis thiab siab yog dab tsi?
Peb feem ntau pom tias qhov ntsuas qhov ntsuas hluav taws xob hluav taws xob (gas detectors) xws li lub tswb hluav taws xob thiab lub tswb ntsuas roj liquefied yog 0-100 feem pua LEL, yog li 0-100 feem pua LEL txhais li cas?
Thaum qhov concentration ntawm cov pa taws kub hnyiab hauv huab cua nce mus txog nws qhov kev txwv qis ntawm kev tawg, peb hu ua qhov phom sij tawg ntawm qhov chaw uas muaj hluav taws kub hauv qhov chaw no li 100 feem pua, uas yog, 100 feem pua LEL. Yog hais tias cov ntsiab lus ntawm cov roj flammable tsuas yog nce mus txog 10 feem pua ntawm nws qhov kev txwv qis qis, peb hu rau qhov kev puas tsuaj ntawm cov nplaim taws ntawm qhov chaw no 10 feem pua LEL; Kev saib xyuas cov pa hluav taws xob hauv cov huab cua puag ncig feem ntau ncaj qha muab cov nplaim taws kub hnyiab ib puag ncig, uas yog, feem pua ntawm cov ntsiab lus ntawm cov pa hluav taws xob hauv huab cua thiab nws qhov kev txwv qis qis: [% LEL]; Yog li ntawd, kev soj ntsuam zoo li no qee zaum hu ua "explosion test", thiab cov cuab yeej saib xyuas siv kuj hu ua "explosion tester".
Qhov siab tshaj plaws ntawm cov pa hluav taws xob hauv huab cua thaum nws ntsib cov nplaim taws yog hu ua qhov txwv siab ntawm kev tawg - "UEL" luv luv. Lus Askiv: Upper Explosion Limited.
Kev txwv tsis pub tawg yog rau cov roj hluav taws xob thiab tseem ceeb heev rau kev teeb tsa lub tswb nrov. Kev txwv tsis pub tawg yog ib lub tswv yim tseem ceeb heev, uas muaj txiaj ntsig zoo hauv kev ua haujlwm tiv thaiv hluav taws thiab tawg. Qhov kev txwv tawg feem ntau yog qhia los ntawm qhov ntim feem pua ntawm cov pa roj combustible hauv huab cua, lossis qhov hnyav feem pua ntawm cov roj combustible.
Qhov txwv tsis pub tawg yog cov ntsiab lus dav dav rau qhov kev txwv qis qis thiab qhov txwv tsis pub tawg. Lub concentration ntawm combustible gas nyob rau hauv cov huab cua yuav tawg tsuas yog thaum lub concentration ntawm cov combustible gas nyob rau hauv lub qis tawg txwv los yog lub sab saum toj tawg txwv, thiab tsis muaj tawg yuav tshwm sim nyob rau hauv lub qis explosion txwv los yog siab tshaj lub siab tawg txwv.
Qhov kev txwv tawg ntawm cov pa hluav taws xob tau muab faib ua qhov txwv kev tawg sab sauv thiab qis qis qis. Tshaj qhov txwv sab saud, cov ntsiab lus oxygen hauv qhov sib tov tsis txaus, thiab nws tsis tuaj yeem ua rau combustion lossis tawg. 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. Lub 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 qis qis yog feem ntau qhia nyob rau hauv chav tsev feem pua LEL. Lub tswb hluav taws xob ruaj khov feem ntau muaj ob lub tswb ceeb toom: 10 feem pua LEL yog lub tswb thib ib, thiab 25 feem pua LEL yog lub tswb thib ob; portable detectors feem ntau muaj 25 feem pua LEL tswb. tswb point.
