Kev siv cov khoom siv roj av hauv kev lag luam
Nyob rau hauv qhov tseeb, ntau gases ntsib nyob rau hauv kev nyab xeeb thiab noj qab haus huv yam yog sib tov ntawm organic thiab inorganic gases. Txawm li cas los xij, vim muaj ntau yam, peb txoj kev nkag siab tam sim no ntawm cov pa phem thiab cov pa phem tseem tsom mus rau cov pa taws kub hnyiab, cov pa roj uas tuaj yeem ua rau mob lom (hydrogen sulfide, hydrocyanic acid, thiab lwm yam), thiab qee cov pa roj carbon monoxide (carbon monoxide), Oxygen thiab lwm yam detectors, yog li no, tsab xov xwm no yuav xub tsom rau kev qhia txog hom kev ntes no, thiab ua cov lus qhia txog kev siv ntau yam tshuaj lom thiab teeb meem (inorganic / organic) gas detectors raws li qhov xwm txheej tam sim no.
Kev faib tawm ntawm cov tshuaj lom thiab teeb meem roj ntes thiab cov khoom tseem ceeb ntawm cov roj ntes yog cov roj sensor.
Gas sensors tuaj yeem muab faib ua peb pawg loj hauv txoj cai:
A) Gas sensors uas siv lub cev thiab tshuaj lom neeg cov khoom: xws li semiconductor hom (surface control type, volume control type, deg potential type), catalytic combustion type, solid thermal conductivity type, etc.
B) Gas sensors uas siv lub cev muaj zog: xws li thermal conduction hom, optical interference type, infrared absorption type, thiab lwm yam.
C) Gas sensors uas siv cov khoom siv hluav taws xob: xws li cov khoom siv hluav taws xob tas li, hom Galvanic cell, diaphragm ion electrode hom, hom electrolyte ruaj khov, thiab lwm yam.
Raws li kev phom sij, peb faib cov pa phem thiab cov pa phem rau hauv ob pawg: cov pa taws thiab cov pa phem.
Vim lawv cov khoom sib txawv thiab kev phom sij, lawv txoj kev tshawb nrhiav kuj txawv.
Cov pa roj carbon monoxide yog cov pa phem tshaj plaws uas tau ntsib hauv petrochemical thiab lwm qhov chaw lag luam. Lawv feem ntau yog cov organic gases xws li alkanes thiab qee cov roj inorganic xws li carbon monoxide. Qee qhov xwm txheej yuav tsum tau ua kom tau raws li cov roj hluav taws xob tawg kom tawg, uas yog: ib qho kev sib xyaw ntawm cov roj hluav taws xob, cov pa oxygen thiab qhov hluav taws kub uas muaj cua sov txaus los hlawv lawv. Cov no yog peb lub ntsiab ntawm kev tawg (raws li qhia hauv daim duab peb sab tawg hauv daim duab saum toj no ntawm sab laug). Ib tug ntawm lawv ploj lawm. Tsis yog, uas yog hais, qhov tsis muaj ib qho ntawm cov xwm txheej no yuav tsis ua rau hluav taws thiab tawg. Thaum cov roj combustible (steam, plua plav) thiab oxygen sib xyaw thiab ncav cuag ib qho concentration, qhov tawg yuav tshwm sim thaum ntsib qhov hluav taws kub nrog qee qhov kub. Peb hu rau qhov concentration ntawm cov pa hluav taws xob uas tawg thaum ntsib qhov hluav taws kub hu ua explosion concentration limit, los yog tawg txwv luv luv, feem ntau qhia hauv %. Qhov tseeb, qhov sib tov no yuav tsis tawg ntawm ib qho kev sib xyaw ua ke tab sis muaj ntau qhov concentration.
