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Mathematical modeling of combustion in a grate-fired boiler burning straw and effect of operating conditions under air- and oxygen-enriched atmospheres

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  • Yu, Zhaosheng
  • Ma, Xiaoqian
  • Liao, Yanfen

Abstract

A three-dimensional mathematical model has been developed as a tool for furnace structure design and operation conditions optimization when the straw combustion is in oxygen-enriched or conventional air atmospheres. Mathematical methods have been used based on a combination of FLIC (A fluid Dynamic Incinerator Code) code for the in-bed incineration and commercial software FLUENT for the over-bed combustion. Oxygen-enriched atmospheres promote the destruction of most pollutants due to the high oxygen partial pressures and temperatures, which is reflected by very low residual amounts of organic combustion by-products in the bottom ash and flue gas of the straw-fired boiler unit. The predictions indicated that the maximum combustion temperature is around 1500K, CO emission is 201vppm and O2 concentration is about 6.9vol% at furnace exit, and it is shown that mathematical models can serve as a reliable tool for detailed analysis of straw combustion processes in the packed-bed furnace when compared with literature measurement data. In comparison to traditional straw combustion, the deviation of flue gas CO and NO is 27.5% and 62.1%, respectively. The numerical simulation results showed that combustion under the oxygen-enriched atmosphere excelled combustion under conventional air.

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  • Yu, Zhaosheng & Ma, Xiaoqian & Liao, Yanfen, 2010. "Mathematical modeling of combustion in a grate-fired boiler burning straw and effect of operating conditions under air- and oxygen-enriched atmospheres," Renewable Energy, Elsevier, vol. 35(5), pages 895-903.
    • Handle: RePEc:eee:renene:v:35:y:2010:i:5:p:895-903
    DOI: 10.1016/j.renene.2009.10.006
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    1. Singal, S.K. & Varun, & Singh, R.P., 2007. "Rural electrification of a remote island by renewable energy sources," Renewable Energy, Elsevier, vol. 32(15), pages 2491-2501.
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    2. Jiakun Chen & Jian Tang & Heng Xia & Tianzheng Wang & Bingyin Gao, 2023. "A Non-Manipulated Variable Analysis of Solid-Phase Combustion in the Furnace of Municipal Solid-Waste Incineration Process Based on the Biorthogonal Numerical-Simulation Experiment," Sustainability, MDPI, vol. 15(19), pages 1-18, September.
    3. Tsiliyannis, Christos A., 2019. "Energy from waste: Plant design and control options for high efficiency and emissions’ compliance under waste variability," Energy, Elsevier, vol. 176(C), pages 34-57.
    4. Miguel Ángel Gómez & Rubén Martín & Joaquín Collazo & Jacobo Porteiro, 2018. "CFD Steady Model Applied to a Biomass Boiler Operating in Air Enrichment Conditions," Energies, MDPI, vol. 11(10), pages 1-18, September.
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    6. Kobyłecki, Rafał & Zarzycki, Robert & Bis, Zbigniew & Panowski, Marcin & Wiński, Mateusz, 2021. "Numerical analysis of the combustion of straw and wood in a stoker boiler with vibrating grate," Energy, Elsevier, vol. 222(C).
    7. Yin, Chungen & Rosendahl, Lasse & Clausen, Sønnik & Hvid, Søren L., 2012. "Characterizing and modeling of an 88 MW grate-fired boiler burning wheat straw: Experience and lessons," Energy, Elsevier, vol. 41(1), pages 473-482.
    8. Wójtowicz-Wróbel, Agnieszka & Kania, Olga & Kocewiak, Katarzyna & Wójtowicz, Ryszard & Dzierwa, Piotr & Trojan, Marcin, 2023. "Thermal-flow calculations for a thermal waste treatment plant and CFD modelling of the spread of gases in the context of urban structures," Energy, Elsevier, vol. 263(PD).
    9. Karim, Md Rezwanul & Bhuiyan, Arafat Ahmed & Sarhan, Abd Alhamid Rafea & Naser, Jamal, 2020. "CFD simulation of biomass thermal conversion under air/oxy-fuel conditions in a reciprocating grate boiler," Renewable Energy, Elsevier, vol. 146(C), pages 1416-1428.
    10. Woon, Kok Sin & Phuang, Zhen Xin & Taler, Jan & Varbanov, Petar Sabev & Chong, Cheng Tung & Klemeš, Jiří Jaromír & Lee, Chew Tin, 2023. "Recent advances in urban green energy development towards carbon emissions neutrality," Energy, Elsevier, vol. 267(C).
    11. Gu, Tianbao & Yin, Chungen & Ma, Wenchao & Chen, Guanyi, 2019. "Municipal solid waste incineration in a packed bed: A comprehensive modeling study with experimental validation," Applied Energy, Elsevier, vol. 247(C), pages 127-139.
    12. Mohammad Hosseini Rahdar & Fuzhan Nasiri, 2020. "Operation Adaptation of Moving Bed Biomass Combustors under Various Waste Fuel Conditions," Energies, MDPI, vol. 13(23), pages 1-18, December.
    13. Abdelhady, Suzan & Borello, Domenico & Shaban, Ahmed, 2018. "Techno-economic assessment of biomass power plant fed with rice straw: Sensitivity and parametric analysis of the performance and the LCOE," Renewable Energy, Elsevier, vol. 115(C), pages 1026-1034.
    14. Su, Xianqiang & Fang, Qingyan & Ma, Lun & Yin, Chungen & Chen, Xinke & Zhang, Cheng & Tan, Peng & Chen, Gang, 2024. "Mathematical modeling of a 30 MW biomass-fired grate boiler: A reliable baseline model taking fuel-bed structure into account," Energy, Elsevier, vol. 288(C).
    15. Trojan, Marcin & Taler, Jan & Smaza, Krzysztof & Wróbel, Wojciech & Dzierwa, Piotr & Taler, Dawid & Kaczmarski, Karol, 2022. "A new software program for monitoring the energy distribution in a thermal waste treatment plant system," Renewable Energy, Elsevier, vol. 184(C), pages 1055-1073.
    16. Tu, Yaojie & Zhou, Anqi & Xu, Mingchen & Yang, Wenming & Siah, Keng Boon & Subbaiah, Prabakaran, 2018. "NOX reduction in a 40 t/h biomass fired grate boiler using internal flue gas recirculation technology," Applied Energy, Elsevier, vol. 220(C), pages 962-973.

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