Numerical investigation of hydrogen enrichment and equivalence ratio on the biogas combustion
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Abstract
While energy plays an indispensable role in every aspect of life, consumption is increasing rapidly with the increasing world population and technological developments. This situation necessitates the efficient use of limited resources, the shift towards renewable energy sources and the control of greenhouse gas emissions. Biogas emerges as an important resource, and increasing its calorific value, especially by mixing it with different fuels, will help expand its areas of use. In this study, the effects of different equivalence ratios and different inlet temperatures on adiabatic flame temperatures were investigated by adding hydrogen, which has high flammability and calorific value, to biogas. Expanding the use of renewable energy sources and investigating the use of biogas without making any changes to existing combustion systems are also among the objectives of the study. Numerical analyses were performed with Python using the GRI 3.0 mechanism. Different analyses were performed with hydrogen at 0-50% rates, CO2 at 0-40% rates, equivalence ratios in the range of 0.5-1.5 and inlet temperatures in the range of 300-600 K. It was observed that the addition of hydrogen increased the calorific value of biogas and thus increased the adiabatic flame temperatures. The highest temperatures were obtained at stoichiometric conditions.
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