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Investigation of Ash Deposition Dynamic Process in an Industrial Biomass CFB Boiler Burning High-Alkali and Low-Chlorine Fuel

Author

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  • Hengli Zhang

    (State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China)

  • Chunjiang Yu

    (State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China)

  • Zhongyang Luo

    (State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China)

  • Yu’an Li

    (State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China)

Abstract

The circulating fluidized bed (CFB) boiler is a mainstream technology of biomass combustion generation in China. The high flue gas flow rate and relatively low combustion temperature of CFB make the deposition process different from that of a grate furnace. The dynamic deposition process of biomass ash needs further research, especially in industrial CFB boilers. In this study, a temperature-controlled ash deposit probe was used to sample the deposits in a 12 MW CFB boiler. Through the analysis of multiple deposit samples with different deposition times, the changes in micromorphology and chemical composition of the deposits in each deposition stage can be observed more distinctively. The initial deposits mainly consist of particles smaller than 2 μm, caused by thermophoretic deposition. The second stage is the condensation of alkali metal. Different from the condensation of KCl reported by most previous literatures, KOH is found in deposits in place of KCl. Then, it reacts with SO 2 , O 2 and H 2 O to form K 2 SO 4 . In the third stage, the higher outer layer temperature of deposits reduces the condensation rate of KOH significantly. Meanwhile, the rougher surface of deposits allowed more calcium salts in fly ash to deposit through inertial impact. Thus, the elemental composition of deposits surface shows an overall trend of K decreasing and Ca increasing.

Suggested Citation

  • Hengli Zhang & Chunjiang Yu & Zhongyang Luo & Yu’an Li, 2020. "Investigation of Ash Deposition Dynamic Process in an Industrial Biomass CFB Boiler Burning High-Alkali and Low-Chlorine Fuel," Energies, MDPI, vol. 13(5), pages 1-11, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:5:p:1092-:d:327073
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    References listed on IDEAS

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    1. Grzegorz Zając & Joanna Szyszlak-Bargłowicz & Wojciech Gołębiowski & Małgorzata Szczepanik, 2018. "Chemical Characteristics of Biomass Ashes," Energies, MDPI, vol. 11(11), pages 1-15, October.
    2. Aime Hilaire Tchapda & Sarma V. Pisupati, 2014. "A Review of Thermal Co-Conversion of Coal and Biomass/Waste," Energies, MDPI, vol. 7(3), pages 1-51, February.
    3. Tae-Yong Jeong & Lkhagvadorj Sh & Jong-Ho Kim & Byoung-Hwa Lee & Chung-Hwan Jeon, 2019. "Experimental Investigation of Ash Deposit Behavior during Co-Combustion of Bituminous Coal with Wood Pellets and Empty Fruit Bunches," Energies, MDPI, vol. 12(11), pages 1-17, May.
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    Cited by:

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    2. Balint, Roland & Engblom, Markus & Niemi, Jonne & Lindberg, Daniel & Saarinen, Timo & Rautala, Jaakko & Hupa, Mikko & Hupa, Leena, 2023. "Morphological and chemical differences within superheater deposits from different locations of a black liquor recovery boiler," Energy, Elsevier, vol. 267(C).
    3. Liu, Zhongyi & Jin, Jing & Zheng, Liangqian & Zhang, Ruipu & Dong, Bo & Liang, Guowei & Zhai, Zhongyuan, 2023. "Adhesion strength of straw biomass ash: Effect of dolomite additive," Energy, Elsevier, vol. 262(PA).
    4. Haochuang Wu & Chen Yang & Zonglong Zhang & Qiang Zhang, 2022. "Simulation of Two-Phase Flow and Syngas Generation in Biomass Gasifier Based on Two-Fluid Model," Energies, MDPI, vol. 15(13), pages 1-15, June.

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