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Combine Effect of Boost Pressure and Exhaust Gas Recirculation (EGR) On Performance and Emission of Constant Speed Compression Ignition Engine: A Review

Author(s):

Patel Manish A. , RKDF- Institute of Sci & Tech. Bhopal; Patel Sagar H., LDRP-ITR, Gandhinagar, India

Keywords:

Diesel engine, NOx emissions, Exhaust Gas Recirculation.

Abstract

An experimental study has been carried out for combined effect of Exhaust Gas Recirculation (EGR) system and boost pressure on performance and emission of constant speed compression ignition engine. As we know that the diesel engine (CI engine) are known for their high NOx formation and Exhaust Gas Recirculation (EGR) is being used widely to reduce and control the oxides of nitrogen (NOx) emission from diesel engines. EGR controls the NOx because it lowers oxygen concentration and flame temperature of the working fluid in the combustion chamber. However, the use of EGR leads to a trade-off in terms of soot emissions moreover it exhausted more unburned hydrocarbons (20-30%) compared to conventional engines and it also affect the efficiency and bsfc of engine performance. Present experimental study were carried out in a single cylinder, water cooled and constant speed direct injection four stroke diesel engine to experimentally evaluate the performance and emissions for three different EGR rates and three different values of inlet air pressure of the engine. This experiment is conducted to see the potential of EGR combine with inlet air pressure. Three different rates: 5%, 10% and 15% of this exhaust gas will recirculate in engine and inlet air pressure ranges from 100 kPa, 120 kPa and 140 kPa is selected to check the effect EGR on different loading conditions. Thus increasing boost pressure of inlet air along with EGR system give improvement in bsfc and brake thermal efficiency also reduce more NOx emission. Experiment was conducted in a four stroke direct injection water cooled constant speed diesel engine with increasing boot pressure attachment and EGR system, which is typically used in agricultural farm machinery. EGR was applied to the experimental engine separately and also with boost pressure to observe their effects on engine performance and emission. In this study, compressor was used to increase the boost pressure of inlet air. The experiments were carried out to experimentally evaluate the performance and emissions for different EGR rates 10%, 15% and 20% and boost pressure 120 kPa, 140 kPa and 160 kPa of the engine. Emissions of NOx, carbon monoxide (CO), hydrocarbons (HC), carbon dioxide (CO2) and exhaust gas temperature of the exhaust gas were measured. Performance parameters such as Brake thermal efficiency, brake specific fuel consumption (BSFC) were calculated. It was found that combined effect of boost pressure attachment and EGR system provided better result on engine performance than individual EGR effect. Reductions in NOx and exhaust gas temperature were observed but emissions of HC, CO and CO2 were found to have increased with usage of EGR and boost pressure. Thus the modified engine provides reduction in NOx and better fuel economy without reducing useful characteristics (brake power, bsfc, brake thermal efficiency etc) of the engine.

Other Details

Paper ID: IJSRDV1I12031
Published in: Volume : 1, Issue : 12
Publication Date: 01/03/2014
Page(s): 2620-2623

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