An investigation into the RCCI engine operation under low load and its achievable operational range at different engine speeds

“…Reactivity controlled compression ignition (RCCI) is a dual fuel low-temperature combustion (LTC) mode that adapts an in-cylinder mixing of at least two fuels of different reactivity to manipulate and improve the combustion phase by stratification [1][2][3][4]. The auto-ignition of the high reactivity fuel (HRF) initiates the combustion while a rise in the temperature and pressure facilitates the burning of the low reactivity fuel (LRF) [5].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation on the Influence of Port Injection at Valve on Combustion and Emission Characteristics of B5/Biogas RCCI Engine

et al. 2020

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High unburned hydrocarbon (UHC) and carbon monoxide (CO) emissions, on account of the premixed air-fuel mixture entering the crevices and pre-mature combustion, are setbacks to reactivity-controlled compression ignition (RCCI) combustion at a low load. The influence of direct-injected B5 and port injection of biogas at the intake valve was, experimentally, examined in the RCCI mode. The port injection at the valve was to elevate the temperature at low load and eliminate premixing for reduced pre-mature combustion and fuel entering the crevices. An advanced injection timing of 21° crank angle before top dead centre and fraction of 50% each of the fuels, were maintained at speeds of 1600, 1800 and 2000 rpm and varied the load from 4.5 to 6.5 bar indicated mean effective pressure (IMEP). The result shows slow combustion as the load increases with the highest indicated thermal efficiency of 36.33% at 5.5 bar IMEP. The carbon dioxide and nitrogen oxides emissions increased, but UHC emission decreased, significantly, as the load increases. However, CO emission rose from 4.5 to 5.5 bar IMEP, then reduced as the load increases. The use of these fuels and biogas injection at the valve were capable of averagely reducing the persistent challenge of the CO and UHC emissions, by 20.33% and 10% respectively, compared to the conventional premixed mode.

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“…The use of alternative low reactivity fuel (LRF) alongside fossil energy demonstrated a considerable potential to address some challenges of global emissions through the invention of more efficient technologies [2], such as dual-fuel reactivity-controlled compression ignition (RCCI) combustion. RCCI mode involves an in-cylinder blending of two or more fuels of varying reaction rates to enhance the combustion magnitude by stratification [3,4]. According to [5], the measures used to address the nitrogen oxides (NOx) and soot emissions in RCCI resulted in an unacceptable rise in carbon monoxide (CO) and unburned hydrocarbon (UHC) emissions.…”

Section: Introductionmentioning

confidence: 99%

Effects of Elevated Diluent Contents on the Combustion and Emissions of Biogas-Diesel RCCI Engine at Full Load

Fattahi¹

2020

IJET

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Difficulty in carbon dioxide (CO2) removal, coupled with the poor combustion due to diverse constituent of biogas, encouraged an investigation of the influence of high diluent (CO2, 25 -45% vol) content and biogas fraction (40 -70%) on the emissions of biogas/diesel dual-fuel reactivity-controlled compression ignition engine. The experiment was conducted at full load and a speed of 1600 rpm. The results showed distinct temperature trends for all the CO2 ratios and biogas fractions while radiation absorption effect of high CO2 content inhibits the combustion. Biogas with 35% CO2 proportion and a fraction of 50% produced the highest maximum temperature and heat released. The combustion resulted in a lower PPRR minimizing the higher-ringing strength tendency. At a 40% biogas fraction and 25% CO2, which simultaneously showed the highest ITE of 38.29%, the lowest BSFC of 7.41 g/kWh was achieved. An increase in the biogas fraction indicated a significant decrease in the nitrogen oxides (NOx) and particulate (PM) emissions by approximately 62.66, and 26.59%, respectively. Also, an increase in the diluent CO2 content decrease the carbon monoxide (CO) and unburned hydrocarbon (UHC) emissions by approximately 20.30, and 38.83%, respectively. However, an increase in those parameters resulted in a severe UHC and CO emissions trade-off with the NOx and PM emissions, though a 70% biogas fraction indicated the potentials of reducing the impact of the trade-off.

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An investigation into the RCCI engine operation under low load and its achievable operational range at different engine speeds

Cited by 39 publications

References 54 publications

Investigation on the RCCI Engine on Performance and Emission

Investigation on the RCCI Engine on Performance and Emission

An Experimental Investigation on the Influence of Port Injection at Valve on Combustion and Emission Characteristics of B5/Biogas RCCI Engine

Effects of Elevated Diluent Contents on the Combustion and Emissions of Biogas-Diesel RCCI Engine at Full Load

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