Abstract
In diesel engines, NOx (Oxides of Nitrogen) forms when the flame temperature in the combustion chamber exceeds 2000 K. Late injection of fuel into the combustion chamber decreases NOx at the cost of fuel efficiency by 10–15%. Recirculating a part of the exhaust gas into the combustion chamber is termed as exhaust gas recirculation (EGR) which helps in reducing NOx with a particulate trade off. Diesel oxidation catalyst and a particulate filter are, therefore, necessary to reduce the particulate. In this chapter, the complex interactions between the EGR, turbocharger, EGR cooler, air fuel ratio, combustion efficiency and pumping work are described. It is shown that EGR provides an effective means for reducing flame temperatures and NOx emissions, particularly under lower air fuel ratio conditions. Combustion deterioration is predominant at higher load, low speed and lower boost conditions due to a substantial reduction of air fuel ratio with EGR.
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Abbreviations
- EGR:
-
Exhaust gas recirculation
- EMF:
-
Exhaust manifold
- IMF:
-
Intake manifold
- HCCI:
-
Homogeneously charged compression ignition engines
- EMS:
-
Engine management system
- SULEV:
-
Semi ultra-low emitting vehicle
- EDC:
-
Electronic diesel control
- EMS:
-
Electronic management system
- ECU:
-
Electronic control unit
- NOx:
-
Oxides of nitrogen
- NO:
-
Nitric oxide
- NO2:
-
Nitrogen dioxide
- O2:
-
Oxygen
- CO2:
-
Carbon dioxide
- CO:
-
Carbon monoxide
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Sahaya Surendira Babu, P., Kumar, P. (2020). External Exhaust Gas Recirculation. In: Lakshminarayanan, P., Agarwal, A. (eds) Design and Development of Heavy Duty Diesel Engines. Energy, Environment, and Sustainability. Springer, Singapore. https://doi.org/10.1007/978-981-15-0970-4_7
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DOI: https://doi.org/10.1007/978-981-15-0970-4_7
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