scholarly journals Effect of air preheating, exhaust gas recirculation and hydrogen enrichment on biodiesel/methane dual fuel engine

2020 ◽  
pp. 146-146
Author(s):  
Kavin Mohanasundaram ◽  
Nagarajan Govindan
Keyword(s):  
Carbon Monoxide ◽  
Thermal Efficiency ◽  
Exhaust Gas Recirculation ◽  
Waste Cooking Oil ◽  
Dual Fuel ◽  
Exhaust Gas ◽  
Oxides Of Nitrogen ◽  
Cooking Oil ◽  
Energy Share ◽  
Gas Recirculation

An experimental study was carried out to investigate the effect of intake air preheating, exhaust gas recirculation and hydrogen enrichment on performance, combustion and emission characteristics of Methane/waste cooking oil biodiesel fuelled compression ignition engine in dual fuel mode. Methyl ester derived from waste cooking oil was used as a pilot fuel which was directly injected into the combustion chamber at the end of the compression stroke. Methane/hydrogen-enriched methane was injected as the main fuel in the intake port during the suction stroke using a low pressure electronic port fuel injector which is controlled by an electronic control unit. The experiments were conducted at a constant speed and at the maximum load. Experimental results indicated that the increase in energy share of gaseous fuel extends the ignition delay. With air preheating the thermal efficiency increased to 49% and 55% of methane and hydrogen-enriched methane energy share respectively. Carbon monoxide and hydrocarbon emissions were higher in methane combustion with biodiesel when compared to the conventional diesel operation at full load and a reduction in carbon monoxide and hydrocarbon was observed with air preheating. Lower oxides of nitrogen were observed with gaseous fuel combustion and it further reduced with exhaust gas recirculation but oxides of nitrogen increased by preheating the intake air. Improvement in thermal efficiency with a reduction in hydrocarbon and carbon monoxide was observed with hydrogen-enriched methane.

scholarly journals Numerical and experimental evaluation on the pooled effect of waste cooking oil biodiesel/diesel blends and exhaust gas recirculation in a twin-cylinder diesel engine

Fuel ◽  
2021 ◽  
Vol 287 ◽  
pp. 119815
Author(s):  
Dhinesh Balasubramanian ◽  
Anh Tuan Hoang ◽  
Inbanaathan Papla Venugopal ◽  
Arunprasad Shanmugam ◽  
Jianbing Gao ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Experimental Evaluation ◽  
Exhaust Gas Recirculation ◽  
Waste Cooking Oil ◽  
Exhaust Gas ◽  
Cooking Oil ◽  
Gas Recirculation

scholarly journals Effect of di-methyl carbonate as additive and exhaust gas recirculation on the performance and emission parameters of diesel engine using diesel-biodiesel blends as fuel

2021 ◽  
Vol 2062 (1) ◽  
pp. 012023
Author(s):  
A Chandravanshi ◽  
S Pandey ◽  
R K Malviya ◽  
A S Paikra
Keyword(s):  
Thermal Efficiency ◽  
Specific Energy Consumption ◽  
Exhaust Gas Recirculation ◽  
Petroleum Products ◽  
Exhaust Gas ◽  
Oxides Of Nitrogen ◽  
Fuel Blend ◽  
Emission Analysis ◽  
Performance And Emission ◽  
Gas Recirculation

Abstract The Current situation of petroleum products pressurizes the world to shift towards green fuels. Dimethyl carbonate (DMC) could be considered as high oxygenated, green additive. Adding DMC in biodiesel increases the quality of combustion, hence reducing emissions with improved thermal efficiency. In the present study, DMC has been blended with biodiesel along with 10% Exhaust Gas Recirculation (EGR) and then performance and emission analysis was done. Results show higher Brake Thermal efficiency with 5% DMC in the biodiesel-diesel blend as compared to biodiesel, but lower than that with diesel. Brake Specific Energy Consumption increases with the increase in DMC in the fuel blend at medium and higher loads, which limits the use of DMC in higher content (10%, 15%). Carbon Mono-oxide and Hydrocarbon emissions reduce with lower content of DMC (5%) at a higher load. There are slight increases in Carbon Di-Oxide at all loads, under the safe limit. The emission of Oxides of Nitrogen (NOx) decreases slightly and this decrease increases with EGR. Higher content of EGR adversely affects the performance and emission characteristics except for NOx and smoke emission. A large decrease in smoke was noted with DMC as an additive in biodiesel due to improved combustion.

Experimental investigation of the combustion characteristics and the emission characteristics of biogas–diesel dual fuel in a common-rail diesel engine

2017 ◽  
Vol 231 (14) ◽  
pp. 1900-1912 ◽  
Author(s):  
Yong Qian ◽  
Yahui Zhang ◽  
Xiaole Wang ◽  
Xingcai Lu
Keyword(s):  
Carbon Monoxide ◽  
Heat Release ◽  
Nitrogen Oxide ◽  
Release Rate ◽  
Exhaust Gas Recirculation ◽  
Dual Fuel ◽  
Emission Characteristics ◽  
Exhaust Gas ◽  
Nitrogen Oxide Emissions ◽  
Gas Recirculation

An experimental study on biogas–diesel dual-fuel compression ignition was conducted in which biogas and diesel are used as the port-injected fuel and the directly injected fuel respectively. The effects of the total lower heating values QLHVs per cycle and the premixed ratio on the combustion characteristics and the emission characteristics are discussed in detail. The results show that, for constant QLHVs, the peak values of the heat release rate curves first decrease and then increase with increasing premixed ratio. Furthermore, the combustion phase is delayed. For a constant premixed ratio, with increasing QLHVs, the heat release rate curves change from a unimodal distribution to a bimodal distribution, and the ignition delay decreases constantly. With higher QLHVs, the nitrogen oxide emissions and the smoke emissions are relatively higher. In addition, the impacts of biogases with different components on the combustion and emissions were also researched. With increasing hydrogen, the combustion becomes increasingly concentrated, which leads to higher nitrogen oxide emissions. The proportion of carbon monoxide in the biogas has a great effect on the carbon monoxide emissions. Also, the influence of exhaust gas recirculation was also studied. With 60% exhaust gas recirculation, the nitrogen oxide emissions can be inhibited effectively.

The impact of water injection and exhaust gas recirculation on combustion and emissions in a heavy-duty compression ignition engine operated on diesel and gasoline

2019 ◽  
Vol 21 (8) ◽  
pp. 1555-1573 ◽  
Author(s):  
Michael Pamminger ◽  
Buyu Wang ◽  
Carrie M Hall ◽  
Ryan Vojtech ◽  
Thomas Wallner
Keyword(s):  
Thermal Efficiency ◽  
Water Injection ◽  
Combustion Process ◽  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Brake Thermal Efficiency ◽  
Fuel Ratio ◽  
Main Injection ◽  
Gas Recirculation ◽  
Diesel Operation

Steady-state experiments were conducted on a 12.4L, six-cylinder heavy-duty engine to investigate the influence of port-injected water and dilution via exhaust gas recirculation (EGR) on combustion and emissions for diesel and gasoline operation. Adding a diluent to the combustion process reduces peak combustion temperatures and can reduce the reactivity of the charge, thereby increasing the ignition-delay and, allowing for more time to premix air and fuel. Experiments spanned water/fuel mass ratios up to 140mass% and exhaust gas recirculation ratios up to 20vol% for gasoline and diesel operation with different injection strategies. Diluting the combustion process with either water or EGR resulted in a significant reduction in nitrogen oxide emissions along with a reduction in brake thermal efficiency. The sensitivity of brake thermal efficiency to water and EGR varied among the fuels and injection strategies investigated. An efficiency breakdown revealed that water injection considerably reduced the wall heat transfer; however, a substantial increase in exhaust enthalpy offset the reduction in wall heat transfer and led to a reduction in brake thermal efficiency. Regular diesel operation with main and post injection exhibited a brake thermal efficiency of 45.8% and a 0.3% reduction at a water/fuel ratio of 120%. The engine operation with gasoline, early pilot, and main injection strategy showed a brake thermal efficiency of 45.0% at 0% water/fuel ratio, and a 1.2% decrease in brake thermal efficiency for a water/fuel ratio of 140%. Using EGR as a diluent reduced the brake thermal efficiency by 0.3% for diesel operation, comparing ratios of 0% and 20% EGR. However, a higher impact on brake thermal efficiency was seen for gasoline operation with early pilot and main injection strategy, with a reduction of about 0.8% comparing 0% and 20% EGR. Dilution by means of EGR exhibited a reduction in nitrogen oxide emissions up to 15 g/kWh; water injection showed only up to 10 g/kWh reduction for the EGR rates and water/fuel ratio investigated.

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