Abstract
Syngas production by inert porous media combustion of rich biogas–air mixtures was studied experimentally, focusing on carbon dioxide utilization and process efficiency. Different gas mixtures of natural gas and carbon dioxide, which simulated a typical biogas composition of 100:0, 70:30, 55:45, and 40:60 (CH4:CO2), were comparatively analyzed considering combustion waves temperatures and velocities, and chemical concentrations products, at high equivalence ratios of φ = 1.5 and φ = 2.0. Different CO2 concentrations on biogas composition showed higher H2 productions than on pure methane (100:0), mainly due to CO2 reforming reactions. Also, syngas production, hydrogen yields, and process efficiency by means of biogas filtration combustion were higher than under methane filtration combustion. Results of the thermochemical conversion of biogas show an alternative and promising non-catalytic technique to CO2 utilization.
Highlights
The current climate change scenario has directed special efforts of governmental bodies and policymakers all over the world toward finding alternatives capable of reducing and reversing damage already done to the environment (Moral et al, 2018)
The present study aims to investigate the impact of CO2 in different compositions of biogas [100:0, 70:30, 55:45, and 40:60 (CH4:CO2)] to evaluate syngas production by the thermal conditions reached by filtration combustion inside an inert porous media (IPM) reactor, with a special focus on observing the behavior of the technology under high concentrations of CO2 and its impact on dry reforming (DR) mechanisms and process efficiency
The comparison of combustion temperature, propagation rate, product gas compositions, reactants conversion, H2 yields, H2 to CO ratio (H/C) ratio, and reforming efficiency is presented for equivalence ratios of 1.5 and 2.0
Summary
The current climate change scenario has directed special efforts of governmental bodies and policymakers all over the world toward finding alternatives capable of reducing and reversing damage already done to the environment (Moral et al, 2018). The need for a paradigm shift regarding energy production and waste management has forced the research and development of new technological alternatives that contribute to the mitigation of anthropogenic impact while driving to sustainable development In this context, there is an increasing interest in bioenergy production, because it allows the use of biomass wastes as feedstock for carbon-neutral energy production (Sahota et al, 2018). A gas fuel mixture mostly composed of methane (CH4, 40–65% vol/vol) and carbon dioxide (CO2, 35–55% vol/vol) with a lower concentration of hydrogen sulfide (H2S, 0.1–3.0% vol/vol), water (H2O), and other trace compounds (Miltner et al, 2017), has an usual lower heating value in the range of 20 and 25 MJ/m3 for CH4 contents between 60 and 65% (Angelidaki et al, 2018) It is produced from the decomposition of wet biomass within an oxygen (O2) lacking atmosphere, process known as anaerobic digestion (AD). This type of biomass with high moisture content represents a relevant fraction of several organic wastes, such as urban waste, Syngas Production From Reforming Biogas
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