Emissions and Performance Characteristics of an Si Engine With Biogas Fuel at Different Co2 Ratios

Abstract

Nowadays increasing emission regulations and environmental concerns have led to the use of alternative fuels in internal combustion engines. Biogas is an alternative fuel that can be produced with clean, green and natural resources. In this study, a single cylinder, four stroke SI engine was operated at stoichiometric conditions, 2800 rpm constant engine speed with biogas fuel at different ratios. As biogas fuel, methane (CH4) and CO2 were used during engine tests. Test results which were taken by using only gasoline were compared with the results obtained by using biogas fuel at different CO2 ratios (10%, 20%, 30% and 40% by volume). Although it was determined specific CO emissions decrease and THC emissions slightly increases with the increasing CO2 ratio, it is foreseen that the increase in THC emissions can be prevented by the use of three way catalytic converter. Although the NOx emissions increase with the use of biogas compared to gasoline, it was significantly reduced by the increased CO2 rate in the biogas fuel, the CO2's heat carrying capacity and reducing the O2 availability of the fuel. On the other hand, because of the high cost of purification process of biogas and after-treatment equipment, it is foreseen that use of biogas at high ratio of CO2 in SI engines will be advantageous in terms of NOx emissions.

Experimental investigation of the effects of ethanol‐diesel mixture on the performance and emissions of the thermal barrier coated diesel engine

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Comparative Assessment of the Emission Characteristics of First, Second and Third Generation Biodiesels as Fuel in a Diesel Engine

“…For all tested biodiesel obtained CO2 emissions are higher as compared to regular diesel fuel, but lesser only for jatropha curcas, due to complete combustion and higher oxygen percentage within the combustion chamber, as compared to diesel fuel. The fuel-air mixture preparation is good in premixed combustion phase due to oxygen contents which results in better combustion and higher CO2 emission [34][35][36]. Particulate Matter Emission Figure 7 shows the specific particulate matter (PM) emission changes at different load for three tested generation biodiesel (B20) samples and diesel.…”

Environmental Impact of Using Generators in the University of Technology in Baghdad, Iraq

“…Many studies have proven the negative relationship between chronic noise exposure and human health [20,21]. These studies have reported that exposure to noise remarkably contributes to hearing loss, performance reduction and changes in physical and emotional reactions [22][23][24]. Most of the generators used in Iraq are old and do not have posttreatment equipment or sound silencers to purify their exhaust gas and emissions or reduce generator noise.…”