The Effect of Biogas Fuel on the Performance and Emissions of Spark Ignition Engine

Jafari Sejahrood, Abouzar and Najafi, Bahman and Faizollahzadeh Ardabili, Sina (2017) The Effect of Biogas Fuel on the Performance and Emissions of Spark Ignition Engine. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

In present study, cow manure and wheat straw were selected as row materials for biogas production. Accordingly, four samples of C/N values including 27, 30, 33 and 36 were selected to be loaded in lab. Scale for biogas and methane production and to obtain the optimal value of C/N. the obtained data were studied using RSM and logistic approaches. Then, the pilot-scale project was loaded in terms of the maximum value of biogas production to be used in the engine test, and the produced methane was used to measure the performance and emissions characteristics of the engine. The experimental results showed that the C/N ratio of 30 had the highest production of biogas and methane, but the optimum ratio of C/N was obtained as 27 by RSM model. RSM method presented an equation for biogas and methane production that shows the high ability of prediction compared to logistic method. To determine the engine emission, a generator engine was selected and gasoline and methane fuels were tested on it. Based on results, using methane as alternative fuel, decreases CO2, CO, HC emission, and engine performance by 46%, 88.27%, 34.94%, and 40%, respectively. Finally, the economic scenario of biogas plant construction was also investigated.

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