Cov teeb meem uas tshwm sim thaum xaiv cov tshuaj lom thiab teeb meem roj ntes
Vim muaj keeb kwm thiab kev txawj ntse, peb tseem muaj ntau yam teeb meem thaum xaiv ntau yam detectors, uas yog qhia tshwj xeeb hauv:
1) Kev kuaj xyuas cov roj hluav taws xob yog qhov tseem ceeb tshaj qhov kev kuaj xyuas cov pa phem.
2) Kev tshawb nrhiav cov pa roj uas tuaj yeem ua rau mob hnyav yog qhov tseem ceeb tshaj qhov kev tshawb nrhiav cov pa roj uas yuav ua rau muaj kev phom sij ntev.
Vim yog cov lus qhia txog ntshav ntawm kev tawg tawg tshwm sim los ntawm kev xau ntawm ntau cov pa roj carbon monoxide, cov tib neeg muab qhov tseem ceeb rau kev tshawb nrhiav cov roj hluav taws xob. Nws tuaj yeem hais tau tias nyob rau hauv ib qho chaw petrochemical thiab tshuaj lom neeg, feem ntau ntawm cov khoom siv phom sij yog LEL detectors. Tab sis tsuas yog nruab nrog LEL detectors nyob deb ntawm qhov txaus los tiv thaiv kev nyab xeeb thiab kev noj qab haus huv ntawm cov neeg ua haujlwm. Nws yog undeniable tias feem ntau ntawm cov volatile txaus ntshai gases yog combustible gases, tab sis cov catalytic combustion combustible gas detector (LEL) tsis yog qhov zoo tshaj plaws kev xaiv rau tag nrho cov combustible gas detector. Nws yog tsim tshwj xeeb rau kev tshawb nrhiav cov methane, thiab nws qhov kev tshawb nrhiav kev ua tau zoo rau lwm yam tshuaj tsis zoo. Yog li ntawd, qhov kev txwv qis dua ntawm cov roj hluav taws xob uas tsis yog methane uas lawv tuaj yeem ntes tau ntau dua li lawv qhov kev tso cai. Piv txwv li: Rau cov pa phom sij thiab tshuaj lom xws li benzene thiab ammonia, nws yog ib qho kev xyaum txaus ntshai heev uas tsuas yog siv lub tshuab hluav taws xob hluav taws xob. Piv txwv li, qhov txo qis ntawm kev tawg ntawm benzene yog 1.2 feem pua, thiab nws cov coefficient kho ntawm LEL detector yog 2.51, uas yog hais tias, qhov concentration ntawm benzene tso tawm rau ntawm LEL detector calibrated nrog methane tsuas yog 40 feem pua. ntawm nws qhov tseeb concentration! ! Ua li no, lub tswb nrov tshaj plaws ntawm benzene uas tuaj yeem kuaj tau los ntawm LEL yog 10 feem pua LEL=10 feem pua * 1.2 feem pua *2.51=3.0*10-3, uas yog ze li ntawm 600 feem pua siab tshaj qhov tso cai concentration ntawm benzene 5 * 10-6 zaug !!. Ib yam li ntawd, lub tswb ceeb toom ntawm 1.5 * 10-2 tau txais los ntawm ammonia ntawm LEL ntes yog li 600 npaug siab dua qhov tso cai concentration ntawm 2.5 * 10-5. Yog li ntawd, nyob ntawm seb cov roj tau kuaj pom, nws muaj kev nyab xeeb dua thiab txhim khu kev ntseeg ntau dua los xaiv cov khoom siv tshuaj lom neeg tshwj xeeb tshaj li tsuas yog xaiv lub ntsuas LEL.
Tsis tas li ntawd, tam sim no, peb tau them nyiaj ntau dua rau kev tshawb nrhiav cov pa roj uas tuaj yeem ua rau mob hnyav, xws li hydrogen sulfide thiab hydrogen cyanide, tab sis tsis txaus siab rau kev tshawb nrhiav cov pa roj uas tuaj yeem ua rau muaj kev phom sij ntev, xws li cov tshuaj tsw qab hydrocarbons thiab cawv. . Kev phom sij rau kev noj qab haus huv thiab kev nyab xeeb ntawm cov neeg ua haujlwm tsis muaj tsawg dua li cov pa roj uas tuaj yeem ua rau mob hnyav! Lawv tuaj yeem ua rau mob qog noj ntshav thiab lwm yam kab mob tsis pom, cuam tshuam rau lub neej thiab kev noj qab haus huv ntawm cov neeg ua haujlwm. Qhov tshwm sim ntawm qhov tshwm sim no, ntxiv rau cov laj thawj kev paub, kuj yog ib qho laj thawj tseem ceeb rau qhov tsis muaj cov khoom siv hluav taws xob tsim hluav taws xob uas tuaj yeem kuaj xyuas qhov qis dua hauv kev ua lag luam.
