A comprehensive study of a reactivity-controlled compression ignition engine fueled with biogas and diesel oil
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ORIGINAL PAPER
A comprehensive study of a reactivity‑controlled compression ignition engine fueled with biogas and diesel oil Payam Asadollahzadeh1 · Mohammad Hossein Hamedi1 · Seyed Ali Jazayeri1 Received: 7 January 2020 / Accepted: 31 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Reactivity-controlled compression ignition (RCCI) engines have been introduced as a promising alternative to compression ignition engines, especially in reducing emissions. It is common practice in an RCCI engine to use two fuels with distinctly different reactivity to control the combustion process. Also, abundant biogas fuel could be considered as a potential and suitable alternative to conventional fuels. Biogas can easily be derived from renewable resources and is basically composed of methane (CH4), carbon dioxide ( CO2), a small amount of hydrogen ( H2), nitrogen ( N2), oxygen (O2) and hydrogen sulfide (H2S). In this paper, biogas as an alternative fuel together with diesel oil is used for reactivity-controlled compression ignition in a modified heavy-duty engine. The biogas fuel with low reactivity is fed through the inlet port and diesel oil with high reactivity directly injected into the engine cylinder. Then, a detailed study of biogas composition, engine speed, intake temperature, fuel metering and injection strategies on combustion characteristics such as engine efficiency and emission levels is carried out. It is demonstrated that the amount of C O2 in biogas composition plays a significant role in combustion and emission processes. Typically, at IMEP = 9.4 bar, as the amount of C O2 in biogas composition is changed from 0 to 40%, the maximum in-cylinder temperature and pressure are reduced about 143 K and 4.6 bar, respectively, while NOx emission is reduced drastically by 75%.
* Payam Asadollahzadeh [email protected] 1
Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran
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Graphic abstract
Effects of Biogas composition
on
Effects of Engine speed
on
combustion characteristics and emission levels of
on
an RCCI engine fueled with biogas /diesel
Effects of Intake temperature
on
Effects of Injection strategy
Single Injection
Double Injection
Keywords Reactivity-controlled compression ignition · Biogas · Diesel oil · Engine · Emission List of symbols ATDC After top dead center CA Crank angle CA50 Crank angle of 50% fuel burned CDC Conventional diesel combustion CI Compression ignition cp Specific heat at constant pressure cv Specific heat at constant volume CO Carbon monoxide CO2 Carbon dioxide EGR Exhaust gas recirculation HCCI Homogeneous charge compression ignition H2 Hydrogen
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H2S Hydrogen sulfide IMEP Indicated mean effective pressure IVC Intake valve closing LHV Lower heating value N2 Nitrogen NOx Oxides of nitrogen O2 Oxygen PCCI Premixed charge compression ignition PPRR Peak pressure rise rate RCCI Reactivity controlled compression ig
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