Optimization of performance and operational cost for a dual mode diesel-natural gas RCCI and diesel combustion engine

Ehsan Ansari, Mahdi Shahbakhti and Jeffrey Naber

Applied Energy, 2018, vol. 231, issue C, 549-561

Abstract: Diesel-NG fuel blends are increasingly being used in Reactivity Controlled Compression Ignition (RCCI) internal combustion engines due to high Brake Thermal Efficiency (BTE), low NOx and PM emissions. It also has few disadvantages such as high unburned Hydro Carbon (HC) and Carbon Monoxide (CO) emissions and relatively low Exhaust Gas Temperature (EGT). This study determines the optimum combustion mode between RCCI and Conventional Diesel Combustion (CDC) at different loads while meeting the Environmental Protection Agency (EPA) emission regulation. A Cost Function (CF) including Brake Specific Fuel Consumption (BSFC) and Brake Specific Urea Consumption (BSUC) is considered and minimized in this study. The optimization of input variables is done between 3 and 12 bar Indicated Mean Effective Pressure (IMEP) engine load. The study aims to calibrate the dual fuel diesel/NG RCCI engine to meet Tier 3 Bin 20 EPA standard, with or without after-treatment system, while minimizing the cost of operation.

Keywords: RCCI; Engine optimization; Natural gas; Dual fuel engines; After-treatment system (search for similar items in EconPapers)
Date: 2018
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Citations: View citations in EconPapers (14)

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DOI: 10.1016/j.apenergy.2018.09.040

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