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SCR Urea Consumption

Urea (as 32.5 % AdBlue solution) consumption for a selective-catalytic-reduction NOx aftertreatment.

EmissionsSCR
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Formula, assumptions, and limits

murea=mNOx6046NSR,mAdBlue=murea/0.325m_\text{urea} = m_{NO_x} \cdot \frac{60}{46} \cdot \text{NSR}, \quad m_\text{AdBlue} = m_\text{urea} / 0.325
SymbolMeaningUnit
mNOxm_{NO_x}Mass of NOx reducedkg
NSRNSRN:NO_x molar ratio
60/4660 / 46Urea / NO₂ mole ratio

Source: MEPC.76(40) - SCR system requirements; ISO 22241 - AdBlue quality