Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 83, Issue -, Pages 249-259Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2014.03.075
Keywords
Dual-fuel engine; Hydrogen; Specific water consumption; Energy share; NOx emission
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The study aims at enhancement of Hydrogen (H-2) energy share and reduction of Oxides of Nitrogen (NOx) emission in a 7.4 kW-CI engine at 1500 rpm using water injection. The test engine was modified to run under dual-fuel operation with diesel-biodiesel blend (B20) and H-2 fuels for different Specific Water Consumption (SWC) of 130, 200, and 270 g/kWh. Under conventional H-2 dual-fuel mode, energy efficiency and NOx emission increased significantly while Hydrocarbon (HC), Carbon Monoxide (CO) and smoke emissions decreased. The maximum H-2 energy share increased from 20% without water to 32%, 36%, and 39% with SWC of 130, 200, and 270 g/kWh respectively. However, SWC of 200 g/kWh was selected as an optimum water quantity for knock free operation, better performance and lower emissions. At the optimum SWC with 20% H-2 energy share, the NOx emission and energy efficiency decreased about 24% and 5.7%, while HC and smoke emissions increased about 38% and 69%. At 20% H-2 energy share, the CO emission increased from 0.0 g/kWh without water to 1.2 g/kWh with the optimum SWC. However, reduction of these HC and CO emissions using oxidation catalysts needs to be studied further. A new methodology for determining heat release rate with consideration of crevice gas was proposed in the study. (C) 2014 Elsevier Ltd. All rights reserved.
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