Qhov kev txwv qis qis ntawm lub tshuab ntsuas roj txhais li cas?
Tsis muaj kev phom sij yog tias qhov ntsuas ntawm qhov ntsuas hluav taws xob hluav taws xob tsawg dhau lossis siab dhau. Nws yuav kub hnyiab los yog tawg tsuas yog thaum nws tov nrog huab cua los ua ib qho kev sib tov, los yog ntau precisely, thaum nws ntsib oxygen los tsim ib tug sib tov ntawm ib tug tej yam kev faib ua feem. Combustion yog ib qho kev ua phem oxidation tshwm sim nrog lub teeb thiab kub. Nws yuav tsum muaj peb yam: a. combustible khoom (gas); b. combustion pab (oxygen); c. ignition qhov chaw (kub). Lub combustion ntawm combustible gas yuav muab faib ua ob pawg. Ib qho yog diffusion combustion, uas yog, cov roj combustible uas volatilizes los yog ejects los yog leaks los ntawm cov khoom sib tov thiab hlawv thaum nws ntsib ib tug ignition qhov chaw. Lwm hom combustion yog thaum combustible gas thiab cua sib xyaw thiab ignite. Cov tshuaj tiv thaiv combustion no yog khaus thiab ceev, thiab feem ntau ua rau lub siab loj thiab lub suab, uas tseem hu ua tawg. Tsis muaj qhov sib txawv nruj ntawm kev sib tsoo thiab tawg.
Cov koom haum muaj cai thiab cov kws tshaj lij tau ua qhov kev ntsuas hluav taws xob tawg thiab tawg ntawm cov pa hluav taws xob tam sim no pom thiab tsim cov kev txwv tawg ntawm cov pa hluav taws xob, uas tau muab faib ua qhov txwv kev tawg (UEL hauv lus Askiv) thiab qis dua kev txwv (qis tawg txwv hauv lus Askiv). Lub ntsiab lus ntawm LEL?). Hauv qab qhov kev txwv qis qis, cov roj combustible hauv cov roj sib xyaw tsis txaus ua rau combustion lossis tawg; saum toj kawg nkaus txwv, cov pa oxygen hauv cov pa sib xyaw tsis txaus ua rau combustion lossis tawg. Tsis tas li ntawd, combustion thiab tawg ntawm combustible gas kuj muaj feem xyuam rau tej yam xws li roj siab, kub, thiab ignition zog. Cov kev txwv tawg feem ntau yog qhia nyob rau hauv cov nqe lus ntawm qhov ntim feem pua ntawm cov concentration.
Qhov kev txwv tawg yog ib lo lus dav dav rau qhov txwv kev tawg qis thiab qhov txwv qhov tawg. Kev tawg yuav tshwm sim tsuas yog thaum qhov concentration ntawm cov pa taws kub hnyiab hauv huab cua nyob nruab nrab ntawm qhov kev txwv qis qis thiab qhov txwv qhov tawg. Yuav tsis muaj qhov tawg hauv qab qhov kev txwv qis qis lossis siab tshaj qhov txwv kev tawg. Yog li ntawd, thaum ua kev ntsuas kev tawg, lub tswb nrov feem ntau yog teeb tsa qis dua 25% LEL ntawm qhov kev txwv qis dua.
