Impact of Biomass Fuel Feeding Ratio in Co-firing Circulating Fluidized Bed Boiler: A Computational Fluid Dynamics Study
DOI:
https://doi.org/10.37934/arnht.17.1.4454Keywords:
Circulating fluidized bed, Computational fluid dynamics, Co-firing combustion, Gas emissions, Boiler efficiencyAbstract
Nowadays, our global population is on a notable rise, coupled with an annual surge in energy consumption. The prevailing reliance on fossil fuels, especially in electricity generation, has significantly contributed to environmental pollution and exacerbated global warming. The circulating fluidized bed, distinguished for its continuous operation and effective heat transfer in the combustion chamber, emerges as a prominent boiler type. Furthermore, the use of biomass fuel, recognized for its renewable and environmentally friendly characteristics, presents an attractive option. Hence, exploring a co-firing system incorporating both coal and biomass as fuel feeds for the boiler holds promise, necessitating optimization for efficient energy production and reduced gas emissions. This study employs computational fluid dynamics to simulate the intricate interactions of solid fuel and flue gas reactions within the boiler, utilizing the two-fluid method for multiphase flow simulation. The circulating fluidized bed boiler in focus employs subbituminous coal, woodchips as biomass sources, and sand as the bed material. Model validation against operational data, including bed temperature, flue gas velocity outlet, and carbon dioxide mass fraction, indicates minimal deviation. Examination of the biomass ratio's impact on fuel feed reveals a reduction in sulfur dioxide emissions with an increasing biomass ratio, attributed to the lower sulfur content in woodchips compared to coal. However, a heightened woodchip blending ratio results in diminished boiler efficiency due to the altered heating value of the mixed solid fuel. The optimized biomass-to-coal ratio in fuel feeding is determined as 59.15%, achieving a maximized boiler efficiency of 82.84% and minimized pollution gas emissions of sulfur oxide and nitrogen oxide in accordance with industrial standards.
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References
Energy consumption by source. 2022.
Yanguo Zhang, Qinghai Li, and Hui Zhou, Chapter 4 - Heat Transfer in Fluidized Beds, in Theory and Calculation of Heat Transfer in Furnaces, Y. Zhang, Q. Li, and H. Zhou, Editors. 2016, Academic Press: Oxford. p. 101-129. https://doi.org/10.1016/B978-0-12-800966-6.00004-1
J. Adánez, P. Gayán, L. F. de Diego, F. García-Labiano, and A. Abad. "Combustion of Wood Chips in a CFBC. Modeling and Validation." Industrial & Engineering Chemistry Research 42, no. 5 (2003): 987-999. https://doi.org/10.1021/ie020605z
Jun Xie, Wenqi Zhong, Yingjuan Shao, Qian Liu, Longhai Liu, and Guoyao Liu. "Simulation of Combustion of Municipal Solid Waste and Coal in an Industrial-Scale Circulating Fluidized Bed Boiler." Energy & Fuels 31, no. 12 (2017): 14248-14261. https://doi.org/10.1021/acs.energyfuels.7b02693
Blaid Alganash, Manosh C. Paul, and Ian A. Watson. "Numerical investigation of the heterogeneous combustion processes of solid fuels." Fuel 141 (2015): 236-249. https://doi.org/10.1016/j.fuel.2014.10.060.
Stanislav V. Vassilev, David Baxter, Lars K. Andersen, and Christina G. Vassileva. "An overview of the chemical composition of biomass." Fuel 89, no. 5 (2010): 913-933. https://doi.org/10.1016/j.fuel.2009.10.022
Gyeong-Min Kim, Jae Hyung Choi, Chung-Hwan Jeon, and Dong-Ha Lim. "Effects of Cofiring Coal and Biomass Fuel on the Pulverized Coal Injection Combustion Zone in Blast Furnaces." Energies 15, no. 2 (2022): 655. https://doi.org/10.3390/en15020655
Thomas Nussbaumer. "Combustion and Co-combustion of Biomass: Fundamentals, Technologies, and Primary Measures for Emission Reduction." Energy & Fuels 17, no. 6 (2003): 1510-1521. https://doi.org/10.1021/ef030031q
Xuebin Wang, Zia Ur Rahman, Zhaomin Lv, Yiming Zhu, Renhui Ruan, Shuanghui Deng, Lan Zhang, and Houzhang Tan. "Experimental Study and Design of Biomass Co-Firing in a Full-Scale Coal-Fired Furnace with Storage Pulverizing System." Agronomy 11, no. 4 (2021): 810. https://doi.org/10.3390/agronomy11040810
Jiyuan Tu, Guan-Heng Yeoh, and Chaoqun Liu, Chapter 1 - Introduction, in Computational Fluid Dynamics (Third Edition), J. Tu, G.-H. Yeoh, and C. Liu, Editors. 2018, Butterworth-Heinemann. p. 1-31. https://doi.org/10.1016/B978-0-08-101127-0.00001-5
Wenchao Ma, Xu Liu, Chen Ma, Tianbao Gu, and Guanyi Chen. "BASIC: A Comprehensive Model for SOx Formation Mechanism and Optimization in Municipal Solid Waste (MSW) Combustion." ACS Omega 7, no. 5 (2022): 3860-3871. https://doi.org/10.1021/acsomega.0c03287
Mohammadreza FarokhiMadjid Birouk. "Application of Eddy Dissipation Concept for Modeling Biomass Combustion, Part 2: Gas-Phase Combustion Modeling of a Small-Scale Fixed Bed Furnace." Energy & Fuels 30, no. 12 (2016): 10800-10808. https://doi.org/10.1021/acs.energyfuels.6b01948
Jun Xie. "Three-Dimensional Eulerian–Eulerian Modeling of Gaseous Pollutant Emissions from Circulating Fluidized-Bed Combustors." Energy & Fuels v. 28, no. no. 8 (2014): pp. 5523-5533-2014 v.28 no.8. https://doi.org/10.1021/ef501095r
ANSYS, ANSYS Fluent theory guide. 2013.
Martin Miltner, Aleksander Makaruk, Michael Harasek, and Anton Friedl. "Computational fluid dynamic simulation of a solid biomass combustor: modelling approaches." Clean Technologies and Environmental Policy 10, no. 2 (2008): 165-174. https://doi.org/10.1007/s10098-007-0137-0
E. Shashi Menon, Chapter Five - Fluid Flow in Pipes, in Transmission Pipeline Calculations and Simulations Manual, E. Shashi Menon, Editor. 2015, Gulf Professional Publishing: Boston. p. 149-234. https://doi.org/10.1016/B978-1-85617-830-3.00005-5
B. Sun, S. Tenneti, and S. Subramaniam. "Modeling average gas–solid heat transfer using particle-resolved direct numerical simulation." International Journal of Heat and Mass Transfer 86 (2015): 898-913. https://doi.org/10.1016/j.ijheatmasstransfer.2015.03.046.
Simscale. Mesh Quality. 2023.
Fabrizio Scala, Amedeo Lancia, Roberto Nigro, and Gennaro Volpicelli. "Spray-Dry Desulfurization of Flue Gas from Heavy Oil Combustion." Journal of the Air & Waste Management Association 55, no. 1 (2005): 20-29. https://doi.org/10.1080/10473289.2005.10464604
Esa Kari Vakkilainen, 3 - Boiler Processes, in Steam Generation from Biomass, E.K. Vakkilainen, Editor. 2017, Butterworth-Heinemann. p. 57-86. https://doi.org/10.1016/B978-0-12-804389-9.00003-4
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