Effect of exhaust gas recirculation and intake pre-heating on performance and emission characteristics of dual fuel engines at part loads |
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| Authors: | A Paykani R Khoshbakhti Saray M T Shervani-Tabar and A Mohammadi-Kousha |
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| Affiliation: | [1]Department of Automotive Engineering, Iran University of Science and Technology, Narmak, Tehran 1684613114, Iran [2]Department of Mechanical Engineering, Sahand University of Technology, Sahand New City, Tabriz, Iran [3]Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran |
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| Abstract: | Achieving simultaneous reduction of NO
x
, CO and unburned hydrocarbon (UHC) emissions without compromising engine performance at part loads is the current focus of
dual fuel engine research. The present work focuses on an experimental investigation conducted on a dual fuel (diesel-natural
gas) engine to examine the simultaneous effect of inlet air pre-heating and exhaust gas recirculation (EGR) ratio on performance
and emission characteristics at part loads. The use of EGR at high levels seems to be unable to improve the engine performance
at part loads. However, it is shown that EGR combined with pre-heating of inlet air can slightly increase thermal efficiency,
resulting in reduced levels of both unburned hydrocarbon and NO
x
emissions. CO and UHC emissions are reduced by 24% and 31%, respectively. The NO
x
emissions decrease by 21% because of the lower combustion temperature due to the much inert gas brought by EGR and decreased
oxygen concentration in the cylinder. |
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| Keywords: | dual fuel engine exhaust gas recirculation （EGR） emission performance venturi EGR system |
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