Cov Ntaub Ntawv Teeb Meem Hauv Kev Xaiv Cov Hluav Taws Xob Hluav Taws Xob Hluav Taws Xob
Kev siv cov pa oxygen hauv kev lag luam ib puag ncig, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig, yuav tsum tau ua tib zoo xav txog ntau yam. Feem ntau, peb xa mus rau cov ntsiab lus oxygen ntau tshaj 23.5% raws li cov pa oxygen ntau dhau (oxygen enrichment), uas tuaj yeem ua rau muaj kev pheej hmoo ntawm kev tawg; Thiab cov ntsiab lus oxygen qis dua 19.5% qhia tias tsis muaj oxygen (hypoxia), uas tuaj yeem ua rau cov neeg ua haujlwm tsis txaus siab, tsis nco qab, thiab tuag taus. Cov ntsiab lus oxygen ib txwm yuav tsum nyob ib puag ncig 20.9%. Oxygen detector kuj yog ib hom electrochemical sensor.
Hauv Suav teb, vim muaj keeb kwm thiab kev paub txog keeb kwm, tseem muaj ntau yam teeb meem thaum xaiv ntau hom kev ntes, uas tau qhia tshwj xeeb hauv:
1) Kev tshawb nrhiav cov pa roj carbon monoxide yog qhov tseem ceeb tshaj qhov kev tshawb nrhiav 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.
Raws li cov lus qhia uas tau kawm los ntawm ntau qhov kev sib tsoo tawg tshwm sim los ntawm cov pa hluav taws xob tawg, tib neeg tseem ceeb heev rau kev tshawb nrhiav roj combustible. Nws tuaj yeem hais tau tias nyob rau hauv ib qho chaw petrochemical lossis tshuaj lom neeg, feem ntau ntawm cov khoom siv phom sij yog LEL detectors. Txawm li cas los xij, tsuas yog siv cov cuab yeej LEL tseem nyob deb txaus los tiv thaiv kev nyab xeeb thiab kev noj qab haus huv ntawm cov neeg ua haujlwm tiag tiag.
Nws tsis tuaj yeem tsis lees paub tias feem ntau cov pa hluav taws xob tsis zoo yog cov roj hluav taws xob, tab sis catalytic combustion combustible gas detectors (LELs) tsis yog qhov kev xaiv zoo tshaj plaws rau kev kuaj xyuas tag nrho cov roj hluav taws xob. Nws yog tsim tshwj xeeb rau kev soj ntsuam methane, tab sis nws qhov kev tshawb nrhiav kev ua tau zoo rau lwm yam tshuaj tsis zoo. Yog li, qhov kev txwv qis qis 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, tsuas yog siv lub ntsuas roj hluav taws xob yog ib txoj hauv kev txaus ntshai heev. Piv txwv li, qhov kev txwv qis qis ntawm benzene yog 1.2%, thiab nws qhov kho qhov tseem ceeb ntawm LEL ntes yog 2.51. Qhov no txhais tau hais tias qhov tso tawm kom pom tseeb ntawm benzene ntawm lub ntsuas LEL ntsuas nrog methane tsuas yog 40% ntawm nws cov concentration tiag tiag !! Ua li no, qhov tsawg kawg nkaus tswb concentration ntawm benzene uas tuaj yeem kuaj tau los ntawm LEL yog 10% LEL=10% * 1.2% * 2.51=3.0 * 10-3, uas yog ze li ntawm 600 lub sij hawm siab tshaj qhov tso cai concentration ntawm benzene ntawm 5 * 10-6 !!. Ib yam li ntawd, lub tswb nrov ntawm 1.5 * 10-2 rau ammonia tau txais ntawm lub ntsuas LEL yog kwv yees li 600 npaug siab dua nws qhov tso cai concentration ntawm 2.5 * 10-5. Yog li ntawd, raws li cov roj sib txawv tau raug kuaj pom, xaiv ib qho tshuaj lom neeg kuaj pom muaj kev nyab xeeb dua thiab txhim khu kev ntseeg ntau dua li tsuas yog xaiv lub ntsuas LEL.
