Abstract
An energetic and environmental assessment of producer gas production from oil sludge (OS) gasification and an analysis of its potential use for electricity generation has been performed. A computational model of OS gasification was developed and two gasification agent (oxygen and air/steam mixture) cases were analyzed. To determine the energy recovery potential of OS, a computational model involving a gas microturbine powered with the producer gas from OS gasification was developed. Results showed that oxygen gasification produced a gas LHV (11.1–7.2 MJ/Nm3) higher than air/steam gasification (9.9–3.8 MJ/Nm3). These differences influenced the microturbine electricity generation index values, which ranged from 0.423 to 0.407 kWh/kg-OS with oxygen, and from 0.42 to 0.393 kWh/kg-OS, using air/steam mixtures. For environmental impacts estimation of gasification/gas-microturbine integration, eight environmental impact categories were assessed by using the Life Cycle Assessment methodology. Among these, oxygen gasification showed higher reductions in comparison to air/steam gasification, in the non-renewable energy (77%), respiratory organics (85%), and carcinogens (85%) categories. When energy recovery from syngas was considered, both cases have a lower carbon footprint (379–569 kg CO2-eq/ton OS) than incineration process (1045 kg CO2-eq/ton OS), which indicates that gasification system is an environmentally attractive option for OS treatment.
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