Domestic urea yog tsuas yog los ntawm cov dej tua hluav taws xob, lub hauv paus ntsiab lus tseem ceeb yog:
1) ntawm qhov kub ntawm 70-75 ℃, urea nyob rau hauv cov kua dej muaj tshwm sim tau tshwm sim tawm.
2) Thaum lub ntsuas kub qis dua 30 ℃, qhov urea rov rov qab los ntawm cov tshuaj tov dej.
3) Txhua qhov kev kho hluav taws xob muaj ib zaug, nws cov purity yuav loj hlob zoo, kev siv cov chav ua ntej thawj chav dej Hydration crystallization ib zaug, tuaj yeem ncav cuag cov qauv uas tsim nyog rau cov tsheb autumn, qhov sib piv ntawm 1.5: 1. Automotive urea yuav tsum siv cov tshuab hluav taws xob ua ntej-kev kawm ultrapure dej. Vim tias SCR catalyst cab kuj yog nws ua rau cov hlau ion lom ua rau lub txiaj ntsim ntawm kev ua kom tsis haum catalytic, qhov automotive tshuaj kho kua yuav tsum siv cov hluav taws xob kev lag luam thawj chav kawm ultrapure dej (resistivity ≥18mω cm). Lub AdBlue yuav pib khov zis hauv-11 ℃, thiab siv sij hawm yuav tsum khov ntawm 20 ℃.
Tam sim no, cov cuab yeej siv los tiv thaiv cov khoom siv sib xyuam xim los ntawm kev ntxiv kev hloov kho kom txo tau cov ntsiab lus ntawm cov tshuaj thiab ntxiv cov cuab yeej cua sov. Automotive Urea Solution (AdBlue) yog ib qho kev tov nrog high-purity urea thiab ntshiab dej tsis muaj lwm yam additives, cov ntsiab urea ntawm cov tshuaj yog 32.5% (feem ntau pawg). Feem ntau ntawm cov dej khov thiab domestic txawv diesel cav manufacturers txais SCR (selective catalytic yuav txo tau) cov cuab yeej siv los tsim kom tau cov kev cai ntawm Euro IV thiab Euro Ⅴ tsheb lub tsheb emission qauv.
Lub tsheb uas xaiv SCR tshuab yuav tsum ntxiv cov tshuaj kua urea raws li kev xa kom txo tau cov tsheb kom lub tsheb tshem nws cov qauv. Diesel engine exhaust treatment fluid (feem ntau hu ua: Automotive noog, tsheb urea, automotive environmental urea), nyob rau hauv Suav teb thiab cov teb chaws Europe hu ua AdBlue, nyob rau hauv teb chaws Amelikas hu ua Def, nyob rau hauv Brazil hu Arla32.adblue yog 32.5% high-purity urea thiab 67.5% cov dej deionized uas muaj cov dej dawb zoo tsho, muaj ib qho tsw ntxhiab ntawm ammonia. Yog nchuav, cov dej ntub thiab ua ib qho crystallization. AdBlue rau cov tsheb, tsheb thauj khoom, thiab cov neeg ua haujlwm tawm hauv lub tsheb mus los ntawm SCR (automotive selective txo cov roj tw khawm) yog cov khoom siv uas yuav tsum tau siv hauv SCR technology, nrog SCR catalysts los hloov cov teeb meem nitrogen oxides diesel xyaw rau hauv dej tsis huv thiab nitrogen. Lub tswv yim tseem ceeb ntawm SCR lawv muaj xws li catalysts, AdBlue txhaj tshuaj, ntim adblue thiab AdBlue dos npaum li cas. Yuav luag tag nrho cov teb chaws Europe, Tebchaws Asmeskas thiab Asia, suav nrog Lub Tuam Tshoj cov neeg tsav tsheb muaj zog nrog rau lub tshuab fais fab (catalytic reduction system) thiab nrog cov kua dej ua haujlwm kom tau txais cov qauv tshiab NOx (xws li Euro IV, Euro V) ua ke nrog AdBlue thiab SCR technology engine kev kawm thiab roj noj, Txo kev siv roj cav ntawm li 6%, txo cov nqi. Qhov nruab nrab ntawm AdBlue yog 5% ntawm kev siv hluav taws xob diesel, uas siv 1.5 liters ib 100 km ntawm kev loj kev tsav tsheb. Lub AdBlue tsuas tso cai ua ke ntawm cov cav siv los txhim kho qhov SCR, raws li nws yog ib qho tsis muaj roj lossis tsis muaj roj additive. AdBlue yuav ua raws li cov kev cai hauv iso22241, din70070 thiab CEFIC cov cai kom muaj kev lag luam zoo ntawm SCR.
AdBlue tsis muaj kev puas tsuaj rau ib puag ncig thiab raug cais raws li qhov qis tshaj qhov muaj feem yuav raug cov kabmob. Haum rau diesel xyaw raws li lub teb chaws plaub lub tso tawm cov qauv ntawm tsheb, tsheb thauj khoom, tsheb npav, tsheb npav.