Lub hauv paus ntsiab lus thiab cov yam ntxwv ntawm cov pa muaj roj nrhiav kom tau
Portable gas detection thiab tswb cuab yeej siv nyob rau hauv petrochemical tuam txhab uas muag muaj xws li ib tug roj nrhiav kom tau thiab ceeb toom cov cuab yeej (xws li cov tsim tshwj xeeb tsim los ntes cov roj combustible, oxygen, hydrogen sulfide, thiab lwm yam.)
Raws li kev phom sij, peb tuaj yeem faib cov pa phem thiab cov pa phem rau hauv ob pawg: cov pa hluav taws xob thiab cov pa phem. Vim lawv cov khoom sib txawv thiab kev phom sij, lawv txoj kev tshawb nrhiav kuj txawv. Qhov tseem ceeb ntawm cov khoom siv hluav taws xob portable yog cov roj sensors, uas tuaj yeem muab faib ua peb pawg raws li lawv cov qauv kev tshawb nrhiav:
(1) Gas sensors siv lub cev thiab tshuaj lom neeg, xws li semiconductor, catalytic combustion, khoom thermal conductivity, thiab lwm yam roj sensors.
(2) Gas sensors uas siv lub cev muaj zog, xws li thermal conductivity yam, cross interference type, infrared absorption type, thiab lwm yam.
(3) Gas sensors siv cov khoom siv hluav taws xob, xws li lub peev xwm electrolysis, Gavanni roj teeb, membrane ion electrode, khoom electrolyte, thiab lwm yam roj sensors.
Txawm hais tias muaj ntau hom kev ntsuas roj, txhua hom muaj nws tus kheej zoo thiab kev txwv. Raws li kev sib piv ntawm ntau xyoo ntawm kev siv nyob rau hauv cov chaw lag luam roj av thiab petrochemical, nws ntseeg tau tias cov kev siv dav dav tshaj plaws thiab kev paub txog cov pa roj carbon monoxide yog cov txheej txheem catalytic combustion rau combustible gas detection, thiab electrochemical method rau cov pa tshuaj lom thiab oxygen detection.
1 Catalytic combustion hom
Catalytic combustion yog ib hom roj sensor uas siv cov ntsiab lus sensing los tsim cov catalytic combustion thaum lawv los rau hauv kev sib cuag nrog combustible gases, ua rau qhov kub thiab txias ntawm lub ntsiab lus nce. Cov roj concentration yog ntsuas los ntawm kev kuaj xyuas cov kev hloov hauv nws qhov tsis kam. Qhov zoo ntawm catalytic combustion gas sensors yog qhov raug siab, zoo stability, zoo linear kev sib raug zoo ntawm cov zis teeb liab thiab roj concentration, thiab me ntsis cuam tshuam los ntawm ib puag ncig kub thiab av noo. Nws qhov tsis zoo yog tias cov catalyst yog nquag lom thiab tsis ua haujlwm.
2 Electrochemical sensors
Electrochemical sensors siv cov txheej txheem electrochemical los kuaj xyuas cov pa roj, uas tuaj yeem faib ua kwv yees li:
(1) Los ntawm kev siv roj los tswj cov peev txheej ntawm qhov sib cuam tshuam ntawm electrode thiab electrolyte hauv ib lub cuab yeej, kev txo oxidation ncaj qha tau tiav, thiab tam sim no cov kev hloov pauv tau tsim nyob rau hauv sab nraud Circuit Court kom ua tiav qhov kev hnov.
(2) Gas dissolution thiab electrolysis nyob rau hauv ib tug tov daim ntawv ionization ntawm gaseous tshuaj, uas tsim muaj peev xwm hloov los ntawm electrode kev txiav txim kom ua tiav sensing.
(3) Cov tshuaj tiv thaiv ntawm cov roj thiab cov tshuaj electrolyte tsim cov kev hloov pauv hauv electrolytic tam sim no kom ua tiav qhov kev xav thiab lwm yam ntaub ntawv. Nyob rau hauv txoj kev tshawb nrhiav tshuaj lom neeg, txoj kev muaj peev xwm electrolysis tsis tu ncua (siv thawj lub hauv paus ntsiab lus) tau siv dav, nrog rau qhov zoo ntawm rhiab heev, kev xaiv siab, me me cuam tshuam nrog roj, thiab qhov tsis zoo ntawm lub neej luv.
