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Energy Conversion and Management, 2014
The energy consumption of the world is increasing at a staggering rate due to population explosion. The extensive use of energy has led to fossil fuel depletion and the rise in pollution. Renewable energy holds the key solution to these aforementioned problems. Biogas, one such renewable fuel, can be used in a diesel engine under dual fuel mode for the generation of power. This work attempts to unfold the effect of compression ratio on the performance, combustion and emission characteristics of a dual fuel diesel engine run on raw biogas. For this investigation, a 3.5 kW single cylinder, direct injection, water cooled, variable compression ratio diesel engine is converted into a biogas run dual fuel diesel engine by connecting a venturi gas mixer at the inlet manifold. Experiments have been conducted at various compression ratios (18, 17.5, 17 and 16) and under different loading conditions fixing the standard injection timing at 23°before top dead centre. At 100% load, the brake thermal efficiencies of the dual fuel mode are found to be 20.04%, 18.25%, 17.07% and 16.42% at compression ratios of 18, 17.5, 17 and 16, respectively, whereas at the same load, the diesel mode shows an efficiency of 27.76% at a compression ratio of 17.5. The maximum replacement of the precious fossil fuel is found to be 79.46%, 76.1%, 74% and 72% at compression ratios of 18, 17.5, 17 and 16, respectively at 100% load. For the dual fuel mode, on an average, there is a reduction in carbon monoxide as well as hydrocarbon emission by 26.22% and 41.97% when compression ratio was increased from 16 to 18. However, for the same setting of compression ratios, there is an increase of oxides of nitrogen as well carbon dioxide emissions by 66.65% and 27.18% respectively. In all the test cases, carbon monoxide and hydrocarbon emissions under dual fuel mode are found to be more than the diesel mode due to the reduction of volumetric efficiency of the former. The experimental evidence suggests to operate the dual fuel diesel engine at high compression ratios.
2019
This study investigates the effect of compression ratio and different fuels on engine performance and exhaust emissions in a 6.8L Turbocharged Industrial Diesel Engine. For carried out this work, a 6 cylinder four stroke engine with GT Power software is modelled and the effect of compression ratio (15:1 - 19:1) and alternative fuels (Diesel, Ethanol, Methanol, Decane, Soybean biodiesel, Diesel- Ethanol) at WOT and various speeds from 800-2400 rpm are presented. The results indicate that the brake specific fuel consumptions of decane fuel at a compression ratio of 17:1 is lower than those of other fuels and also the maximum brake torque obtained with decane fuel at 1400 rpm. At this engine observed that decane fuel has higher brake power as compared to other fuels used due to higher heating value content. The emission results show that diesel fuel emitted more Carbon monoxide and Carbon dioxide emissions but soybean biodiesel (B100) has less Carbon monoxide, whereas highest NOx is founded with soybean biodiesel. Carbon monoxide and Carbon dioxide emissions are very close to each other when used decane and diesel fuel. In general decane fuel has higher performance and soybean biodiesel had fewer emissions at a compression ratio of 17:1.
Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2020
The present work describes the preparation of producer gas and biogas from waste biomass material and its application in a twin cylinder dual-fuel diesel engine to study their performance and emission characteristics by the fractional replacement of fossil diesel in dual-fuel mode. Experiments are carried out both in diesel mode as well as dual-fuel mode operation under different engine loads. Comparative outcomes of performance and emission parameters for both modes of operations are presented. The study reveals that dual-mode operations show lower performance characteristics but better control of emission parameters like nitric oxide (NO) and smoke opacity compared to diesel mode. The hydrocarbon emission of producer gas-diesel and biogas-diesel was found to be 65.8% and 109.7% respectively, higher than diesel mode at the optimum load of 8 kW. Similarly, brake thermal efficiency of dual-mode operation of producer gas-diesel and biogas-diesel was 2.47% and 1.67%, respectively, lower than diesel mode. The pilot fuel savings percentage achieved was 85.5% in biogas-diesel and 83% in producer gas-diesel operation at the same loading condition. Further, comparing biogas with producer gas, it was observed that some of the emission parameters like carbon monoxide CO and NO were better controlled by biogas than producer gas whereas, HC and smoke emissions were better controlled by producer gas than biogas.
Sustainability
Alternative fuels are found to be the most promising solution to the problem of conventional IC engine pollution because their use curtails its huge emissions without exerting a negative impact on its performance. In this research, a conventional compression ignition engine is investigated by operating it with the combination of simulated biogas and neat diesel under a dual fuel mode of operations. The simulated biogas in the current work comprises different proportions of methane and carbon dioxide in the mixture. The full factorial approach in this work involved studying the effects of parameters such as biogas flow rate, composition, intake temperature, torque, and methane enrichment (complete removal of CO2 from biogas) on the engine performance, emissions, and combustion indices with an extensive number of experiments. It is witnessed from the research that biogas is capable of providing a maximum of 90% of the overall energy input, while the CI engine operates under dual fuel ...
IJERT-Performance and Emission Analysis on Single Cylinder Diesel Engine Using Dual Fuels"
International Journal of Engineering Research and Technology (IJERT), 2013
https://www.ijert.org/performance-and-emission-analysis-on-single-cylinder-diesel-engine-using-dual-fuels https://www.ijert.org/research/performance-and-emission-analysis-on-single-cylinder-diesel-engine-using-dual-fuels-IJERTV2IS90262.pdf Biodiesel is an alternative fuel to diesel derived from vegetable oils by transesterification process. It can be used in diesel engines with/without any modification in the engine system. Biodiesel engines emit slightly higher NOx emissions, as compared to that of diesel engines, as higher cylinder temperatures achieved during combustion. A single cylinder diesel engine was modified to use LPG in dual fuel mode to study the performance, emission, and characteristics. The primary fuel, liquefied petroleum gas (LPG), was mixed with air, compressed, and ignited by a small pilot spray of diesel. The kirloskar (AV1 model) 4-stroke single cylinder water cooled diesel engine in made to work as Dual Fuel Engine by attaching a mixing chamber to the engine and giving the LPG gas connections to supply LPG. The engine performed satisfactorily with LPG-Biodiesel, so that the PAME can be used as an alternative fuels in existing Dual Fuel Engine without any hardware modification in the system. The engine has been properly modified to operate under dual fuel operation using LPG as the primary fuel and Diesel, POME as an ignition source. From the experimental results obtained with LPG-Diesel, LPG-POME in dual fuel engine, it was concluded that the brake thermal efficiency of the engine under dual fuel mode is less compared to normal diesel operation at lower and part loads. But at higher loads the efficiency of the engine with LPG-Diesel in a dual fuel mode is comparable with normal diesel operation. It was also noticed reduction in emissions of diesel engine with dual fuel mode.
Study of Dual Fuel Engine as Environmentally Friendly Engine
2019
The diesel engine is an internal combustion engine that uses compressed air to combust. The diesel engines are widely used in the world because it has the most excellent combustion efficiency than other types of internal combustion engine. However, the exhaust emissions of it produce pollutants that are harmful to human health and the environment. Therefore, natural gas used as an alternative fuel using on compression ignition engine to respond those environment issues. This paper aims to discuss the comparison of the technical characteristics and exhaust gases emission from conventional diesel engine and dual fuel diesel engine. According to the study, the dual fuel engine applications have a lower compression pressure and has longer ignition delay compared with normal diesel mode. The engine power is decreased at dual fuel mode. However, the exhaust gases emission on dual fuel engine significantly reduce the nitrogen oxide (NOx), carbon dioxide (CO<sub>2</sub>) and par...
Transstellar Journals , 2020
This work tries to identify the effect of compression ratio on the emission, performance and combustion characteristics of a diesel engine run on multi blended second generation biofuel. For this experiment a single cylinder, 4-Stroke, water-cooled, DI variable CR diesel engine and an alternate for diesel-multi blend of Waste cooking oil Methyl Ester (WME), Tyre Pyrolysis Oil (TPO) and Cerium oxide (CeO 2) were used. Investigation has been conducted at various CRs (17, 16 and 14) in different loading percentiles by fixing the injection timing at 23 crank angle of BTDC. Investigation shows an improvement in Break thermal efficiency and a decrease in Specific fuel consumption as compression ratio increases. It is observed that a linear improvement in combustion properties like peak cylinder pressure and heat release rate happens when compression ratio increases. Due to high cylinder pressure and temperature the NOx emissions increase at higher compression ratio whereas Carbon monoxide (CO) and Hydrocarbon (HC) emissions are lesser in the same scenario.
Environmental concern and availability of petroleum fuels have caused interest in the search for alternative fuels for internal combustion engine. Many alternate fuels are tried by various researches. Based on literature review it is found that for diesel engine Bio Diesel is most promising fuel. This project works prospects and opportunities of utilizing biodiesel and increasing biodiesel-diesel blend ratio as fuel in diesel engine is going to be studied by varying compression ratio. Also based on experimentation an optimum blend and engine parameters are to be suggested for obtaining better performance and emission control. Biodiesel present a very promising scenario of functioning as alternative fuels to diesel fuel. The properties of these can be compared favorably with the internal combustion engine fuels specially diesel engine. Experiments will performed for three compression ratio i.e. 16, 17 and 18 using biodiesel diesel blends i.e. B0, B10, B20, B30, with load variation from no load to full load and compared with base cases i.e. engine using diesel as a fuel. The parameters which will study in performance brake power, brake specific fuel consumption and brake thermal efficiency, In emission carbon monoxide, carbon dioxide, nitrogen oxide. As per the literature survey B20 (20%biodiesel and 80% diesel) is best in performance compare to other blends. But NOx formation is also little higher in B20.
Combustion, performance and emission analysis of dual fuel engine using tsrb biogas
Energy Sources, Part A: Recovery, Utilization, And Environmental Effects, 2018
In the present work, karanja oil methyl ester (KOME) biodiesel is used in a compression ignition engine to find an alternative to diesel. The use of biodiesel in a CI engine leads to poor performance and high brake specific fuel consumption due to the higher viscosity and lower calorific value of biodiesel. This problem can be reduced by increasing the injection temperature of biodiesel or its blends to a certain temperature. In this study, working fuel is tested at preheating temperatures of 95 °C for various loading conditions (0, 25, 50, 75 and 100%). Effect of different KOME biodiesel-diesel blends (B0, B30, B50 and B100) on engine performance, combustion and emissions is studied at different loads. At higher temperature, the viscosity of the fuel decreases which leads to better combustion, improves the atomization as well as vaporization of fuel in a diesel engine, resulting in higher engine performance and lower emissions of CO and HC, with slight increment in NO X and CO 2 emission compared to unheated neat diesel and biodiesel blends. The result shows that for 100% biodiesel (B100) at full load, BTE is improved by 9.1% compared to unheated case. Preheating of B100 fuel upto 95 °C at full load decreases the BSFC, CO and HC emission by 6.5%, 8.1% and 10.6%, respectively, compared to unheated case. Keywords Biodiesel • KOME • Fuel inlet temperature • Emission • Combustion Abbreviations BTE Brake thermal efficiency BSFC Brake specific fuel consumption KOME Karanja oil methyl ester B0 0% biodiesel + 100% diesel B30 30% biodiesel + 70% diesel B50 50% biodiesel + 50% diesel B100 100% biodiesel + 0% diesel