Abstract
In recent years, due to stringent emission regulations vehicle manufacturers have been compelled to cut down noxious pollutants released from diesel engines. Different alternative solutions have been recommended to achieve this challenging task. One of these alternative solutions is the utilization of biogas in addition to the use of liquid diesel. In this regard, the current study investigates the combustion characteristics and exhaust emissions of a turbocharged, direct injection, diesel engine operating at constant speed (1800 rpm) and under dual fuel mode with diesel as the pilot fuel and biogas (generated from pig manure and corn straw) and methane enriched biogas. Simulations were carried out at four various engine loads corresponding to brake mean effective pressure (BMEP) of 0.425, 0.85, 1.275, and 1.7 MPa using GT-Power package. The BTE values of biogas-diesel were higher as compared to diesel fuel. The CO2 ratio of biogas did not impact BTE considerably. The highest BTE value of 38.22% was recorded for BG45. However, the Brake specific fuel consumption (BSFC) values for the biogas-diesel fuels were higher than that of diesel fuel operations. With respect to emissions, compared to diesel fuel operation, the hydrocarbon (HC) and CO2 of the biogas-diesel were higher, but NOx and CO pollutants were much lower. The utilization of biogas with diesel by all accounts is attractive to cut down discharges and improve performance of the engine. The engine performance did not deteriorate with up to 45% CO2 proportion in biogas.
Highlights
Due to their greater thermal efficiency, diesel engines play a key role in the world’s transport and industrial facilities [1], in particular in heavy-duty systems such as lorries, buses, building and farm facilities, locomotives, vessels, etc. [2]
Nathan et al [31] reported that the CO2 in the biogas smothered the high rate of release which is common in homogeneous charge compression ignition (HCCI) engines
Engine performance and emission parameters such as brake thermal efficiency (BTE) change in Brake specific fuel consumption (BSFC), Exhaust gas Temperature (EGT), HC, carbon monoxide (CO), CO2, and NOX at four various engine loads and at a constant engine speed of 1800 rpm were assessed for the biogas-diesel fuels and were compared to D100
Summary
Due to their greater thermal efficiency, diesel engines play a key role in the world’s transport and industrial facilities [1], in particular in heavy-duty systems such as lorries, buses, building and farm facilities, locomotives, vessels, etc. [2]. Nathan et al [31] reported that the CO2 in the biogas smothered the high rate of release which is common in homogeneous charge compression ignition (HCCI) engines They found improved efficiency and low levels of NOX and soot. A lot of studies have been carried out on the usage of biogas in a diesel engine in a dual fuel approach using biogas-diesel (BG-D), biodiesel-biogas (BD-BG), and diesel-biogas-hydrogen (D-BG-H) They have embraced different engines and fuel alteration to enhance the thermal efficiency and cut down the level of pollutants emanated from CI engines. As indicated by the research works above, biogas can be utilized as a fuel in CI dual-fuel engines without any engine modification These studies have demonstrated that biogas-diesel fuels improve the efficiency and reduce emissions. The performance of the biogas-diesel fuels was compared to the reference diesel fuel
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