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Experimental Study on NO Reduction of Diesel Engine by EGR Coupled with SCR
Size Zhang1, Xuexuan Nie1, Yuhua Bi1
1Yunnan Key Laboratory of Internal Combustion Engine, Kunming University of Science and Technology, Kunming 650500, China.
ACS Omega
|February 26, 2024
Summary
Balancing exhaust gas recirculation (EGR) and selective catalytic reduction (SCR) with AdBlue is key to reducing nitrogen oxide (NOx) emissions in diesel engines while managing fuel costs. Coordinated control minimizes emissions and overall engine expenses.
Area of Science:
- Internal Combustion Engines
- Environmental Engineering
- Automotive Engineering
Background:
- Diesel engines face stringent regulations on nitrogen oxide (NOx) emissions.
- Exhaust Gas Recirculation (EGR) and Selective Catalytic Reduction (SCR) are primary emission control technologies.
- EGR can increase fuel consumption, while SCR requires AdBlue, impacting overall engine economics.
Purpose of the Study:
- To evaluate the trade-offs between NOx emission control and fluid costs in diesel engines.
- To analyze the combined effect of EGR and SCR (AdBlue dosage) on engine performance and economy.
- To determine optimal control strategies for balancing emission reduction and operational expenses.
Main Methods:
- Engine testing was conducted at 1600 and 2100 rpm across various loads (25-100%).
- The aftertreatment system included a Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF), SCR, and Ammonia Slip Catalyst (ASC).
- Exhaust gas recirculation (EGR) valve opening and AdBlue dosage were systematically varied.
Main Results:
- Increasing EGR opening reduced NOx emissions but increased brake-specific fuel consumption (BSFC) and exhaust temperature.
- Higher AdBlue dosage improved NOx conversion efficiency, approaching near-zero emissions.
- Fluid costs (diesel + AdBlue) increased as NOx emissions decreased, influenced by AdBlue/diesel price ratios.
Conclusions:
- Coordinated control of EGR and AdBlue is essential for achieving low NOx emissions and mitigating total fluid costs.
- Lower AdBlue-to-diesel price ratios reduce the economic impact of EGR on fluid costs.
- This research offers guidance for optimizing EGR and urea injection strategies in diesel engines.
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