Thermodynamic limitations to direct CO2 utilisation within a small-scale integrated biomass power cycle

Enhancement of gasification in oxyfuel BECCS cycles employing a direct recycling CO2 utilisation process

“…Validation of the model used in this study was previously published [13], showing excellent agreement with thermodynamic studies available in the literature. This exercise also illustrated the ability of the model to approximate experimental outputs from a pilot scale downdraft gasification of wood residues [25], however small deviations in syngas composition were noted.…”

“…Simulation of the IOGC system described above is performed using Aspen Plus process modelling. Detailed descriptions of the numerical methods used in this simulation are provided in Greencorn et al [13] while a brief summary is provided in this section. Derivations of the relevant equations and model parameters are based on an ideal gas equation of state.…”

“…Equilibrium models are 0-dimensional and time independent, thus eliminating hydrodynamic, kinetic, and geometric influences of specific gasifier design features on the biomass conversion reaction [27]. This approach to gasification analysis truly highlights the impact of systemlevel process parameters on syngas production, making it the preferred method to assess gasification performance in complex, integrated cycles [13,12,15].…”

“…Such benefits might include the conversion of CO 2 into useful products like fuels or could provide services like heat transfer or combustion dilution [10]. New techniques in system design for biomass fuelled, integrated gasification power cycles have shown promise in increasing the efficiency of power production through a direct CDU strategy unique to gasification applications [11][12][13]. In effect, using CO 2 as a gasifying agent to produce biosyngas has the potential to enhance the reverse Boudouard (equation ( 1)), reverse water-gas shift (equation ( 2)), and dry reforming (equation ( 3)) reactions under high temperatures.…”

“…Although not an example of a BECCS system, a detailed analysis of the gasification conditions in an air-CO 2 biomass integrated gasification power cycle provided valuable insights into the influence of exhaust recycling CDU on the feedstock conversion process [13]. Initial analysis of the system predicted only modest efficiency improvements of 1.1 %.…”