Numerical Simulation of Different Configurations for a Combined Gasification/Carbonization Reactors
Gasification and carbonization are two of the most common ways for biomass utilization. Both processes are using part of the waste to be accomplished, either by incomplete combustion or for heating for both gasification and carbonization, respectively. The focus of this paper is to minimize the part of the waste that is used for heating biomass for gasification and carbonization. This will occur by combining both gasifiers and carbonization reactors in a single unit to utilize the heat in the product biogas to heating up the wastes in the carbonization reactors. Three different designs are proposed for the combined gasification/carbonization (CGC) reactor. These include a parallel combination of two gasifiers and carbonized syngas, carbonizer and combustion chamber, and one gasifier, carbonizer, and combustion chamber. They are tested numerically using ANSYS Fluent Computational Fluid Dynamics to ensure homogeneity of temperature distribution inside the carbonization part of the CGC reactor. 2D simulations are performed for the three cases after performing both mesh-size and time-step independent solutions. The carbonization part is common among the three different cases, and the difference among them is how this carbonization reactor is heated. The simulation results showed that the first design could provide only partial homogeneous temperature distribution, not across the whole reactor. This means that the produced carbonized biomass will be reduced as it will only fill a specified height of the reactor. To keep the carbonized product production high, a series combination is proposed. This series configuration resulted in a uniform temperature distribution across the whole reactor as it has only one source for heat with no temperature distribution on any surface of the carbonization section. The simulations provided a satisfactory result that either the first parallel combination of gasifier and carbonization reactor could be used with a reduced carbonized amount or a series configuration to keep the production rate high.Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 175
 P. Basu, Biomass gasification, pyrolysis and torrefaction: practical design and theory: Academic press, 2018.
 T. Reed and A. Das, "Handbook of Biomass Downdraft Gasifier Engine Systems," 1988.
 J. Twidell and T. Weir, Renewable energy resources: Routledge, 2015.
 P. McKendry, "Energy production from biomass (part 1): overview of biomass," Bioresource technology, vol. 83, pp. 37-46, 2002.
 R. Saidur, E. Abdelaziz, A. Demirbas, M. Hossain, and S. Mekhilef, "A review on biomass as a fuel for boilers," Renewable and sustainable energy reviews, vol. 15, pp. 2262-2289, 2011.
 M. Amer, M. Nour, M. Ahmed, S. Ookawara, S. Nada, and A. Elwardany, "The effect of microwave drying pretreatment on dry torrefaction of agricultural biomasses," Bioresource technology, vol. 286, pp. 121400-121400, 2019.
 P. McKendry, "Energy production from biomass (part 2): conversion technologies," Bioresource technology, vol. 83, pp. 47-54, 2002.
 L. Zhang, C. C. Xu, and P. Champagne, "Overview of recent advances in thermo-chemical conversion of biomass," Energy Conversion and Management, vol. 51, pp. 969-982, 2010.
 M. Patel, X. Zhang, and A. Kumar, "Techno-economic and life cycle assessment on lignocellulosic biomass thermochemical conversion technologies: A review," Renewable and Sustainable Energy Reviews, vol. 53, pp. 1486-1499, 2016.
 H. Jameel and D. R. Keshwani, "Thermochemical conversion of biomass to power and fuels," in Biomass to renewable energy processes, ed: CRC Press, 2017, pp. 375-422.
 P. McKendry, "Energy production from biomass (part 3): gasification technologies," Bioresource technology, vol. 83, pp. 55-63, 2002.
 V. Krishnamoorthy and S. Pisupati, "A critical review of mineral matter related issues during gasification of coal in fixed, fluidized, and entrained flow gasifiers," Energies, vol. 8, pp. 10430-10463, 2015.
 M. J. Prins, K. J. Ptasinski, and F. J. Janssen, "More efficient biomass gasification via torrefaction," Energy, vol. 31, pp. 3458-3470, 2006.
 S. Kasaoka, Y. Sakata, and M. Shimada, "Effects of coal carbonization conditions on rate of steam gasification of char," Fuel, vol. 66, pp. 697-701, 1987.
 K. Ichikawa, J. Inumaru, K. Kidoguchi, S. Hara, M. Ashizawa, and M. Kanai, "Carbonization and gasification of biomass and power generation system," ed: Google Patents, 2005.
 K. Umeda, S. Nakamura, D. Lu, and K. Yoshikawa, "Biomass gasification employing low-temperature carbonization pretreatment for tar reduction," Biomass and Bioenergy, vol. 126, pp. 142-149, 2019.
 L. Ding, K. Yoshikawa, M. Fukuhara, Y. Kowata, S. Nakamura, D. Xin, et al., "Development of an ultra-small biomass gasification and power generation system: Part 2. Gasification characteristics of carbonized pellets/briquettes in a pilot-scale updraft fixed bed gasifier," Fuel, vol. 220, pp. 210-219, 2018.
 Q.-V. Bach, H.-R. Gye, D. Song, and C.-J. Lee, "High quality product gas from biomass steam gasification combined with torrefaction and carbon dioxide capture processes," International Journal of Hydrogen Energy, vol. 44, pp. 14387-14394, 2019.
 J. Huang, Y. Qiao, X. Wei, J. Zhou, Y. Yu, and M. Xu, "Effect of torrefaction on steam gasification of starchy food waste," Fuel, vol. 253, pp. 1556-1564, 2019.
 B. Erlach, B. Harder, and G. Tsatsaronis, "Combined hydrothermal carbonization and gasification of biomass with carbon capture," Energy, vol. 45, pp. 329-338, 2012.
 A. Tremel, J. Stemann, M. Herrmann, B. Erlach, and H. Spliethoff, "Entrained flow gasification of biocoal from hydrothermal carbonization," Fuel, vol. 102, pp. 396-403, 2012.
 D. S. Gunarathne, A. Mueller, S. Fleck, T. Kolb, J. K. Chmielewski, W. Yang, et al., "Gasification characteristics of hydrothermal carbonized biomass in an updraft pilot-scale gasifier," Energy & Fuels, vol. 28, pp. 1992-2002, 2014.
 J. Ma, M. Chen, T. Yang, Z. Liu, W. Jiao, D. Li, et al., "Gasification performance of the hydrochar derived from co-hydrothermal carbonization of sewage sludge and sawdust," Energy, vol. 173, pp. 732-739, 2019.
 X. Zheng, W. Chen, Z. Ying, J. Huang, S. Ji, and B. Wang, "Thermodynamic investigation on gasification performance of sewage sludge-derived hydrochar: Effect of hydrothermal carbonization," International Journal of Hydrogen Energy, vol. 44, pp. 10374-10383, 2019.