Cov pa emissions los ntawm diesel xyaw feem ntau yog tsim los ntawm NOx thiab carbon hais. Thaum cov pa roj carbon monoxide tuaj yeem lim tau yooj yim los ntawm cov pa tawm, nitrogen oxides (NOx) muaj cov khoom muaj kuab paug zoo uas tuaj yeem cuam tshuam rau tib neeg kev noj qab haus huv thiab tseem ua rau cov kua qaub los nag. Yog li ntawd, txhawm rau txo cov emission ntawm nitrogen oxides, tsheb yuav tsum siv urea.
Lub luag haujlwm ntawm urea yog dab tsi?
Hauv cov tsheb diesel, urea tuaj yeem hloov cov nitrogen oxides hauv cov pa tawm mus rau hauv cov pa tsis zoo thiab dej los ntawm cov txheej txheem hu ua Selective Catalytic Reduction (SCR). Cov cuab yeej no zoo txo cov emission ntawm cov teeb meem nitrogen oxides los ntawm lub tsheb tso pa.
Yuav siv urea li cas?
Urea yog siv ncaj qha rau cov cav diesel thiab catalytically txo siv SCR thev naus laus zis. Thaum kuaj pom nitrogen oxide nyob rau hauv cov yeeb nkab tso tawm, lub tank urea cia li txau cov dej kho, hloov mus rau hauv cov pa tsis muaj teeb meem thiab dej ua ntej yuav tawm. Feem ntau, nyob ib ncig ntawm 5 litres ntawm urea yog noj ib 100 litres ntawm diesel los xyuas kom meej cov nyhuv catalytic. Nws yog ib qho tseem ceeb uas yuav tsum tau siv automotive-qib urea uas ua tau raws li qhov yuav tsum tau ua.
Qhov tseem ceeb ntawm kev tiv thaiv ib puag ncig:
Lub tsheb tso tawm muaj cov pa phem xws li chlorides, uas cuam tshuam rau huab cua zoo. Urea reacts chemically nrog chloride cov pa phem nyob rau hauv lub tso pa, ua kom tsis muaj teeb meem ammonia thiab dej, yog li txo kev puas tsuaj rau tib neeg thiab ib puag ncig. Yog li ntawd, cov tsheb yuav tsum tau ntxiv urea kom tau raws li kev txwv emissions rau chlorides; txwv tsis pub, lawv yuav raug nplua.
Kev ceev faj rau kev siv urea:
Thaum ntxiv urea rau cov tsheb, nws yog ib qho tseem ceeb uas yuav tsum xav txog kev tu cev kom tsis txhob muaj av thaiv cov urea pipelines, uas tuaj yeem cuam tshuam cov nyhuv catalytic. Automotive urea yog sib xyaw ntawm high-purity urea thiab ultra-ntshiab dej nyob rau hauv tej proportions. Nws tsis muaj tshuaj lom tab sis muaj alkalinity tsis muaj zog, thiab tuaj yeem ua rau khaus qhov muag thiab tawv nqaij, yog li nws yog ib qho tseem ceeb uas yuav tsum tau ceev faj thaum tuav.
