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Influence of Coal Blending on Ash Fusibility in Reducing Atmosphere

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  • Mingke Shen

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

  • Kunzan Qiu

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

  • Long Zhang

    (Laboratory for Thermal Hydraulic and Safety, China Nuclear Power Technology Research Institute, Shenzhen 528026, China)

  • Zhenyu Huang

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

  • Zhihua Wang

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

  • Jianzhong Liu

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

Abstract

Coal blending is an effective way to organize and control coal ash fusibility to meet different requirements of Coal-fired power plants. This study investigates three different eutectic processes and explains the mechanism of how coal blending affects ash fusibility. The blended ashes were prepared by hand-mixing two raw coal ashes at five blending ratios, G:D = 10:90 (G10D90), G:D= 20:80 (G20D80), G:D = 30:70 (G30D70), G:D = 40:60 (G40D60), and G:D = 50:50 (G50D50). The samples were heated at 900 °C, 1000 °C, 1100 °C, 1200 °C, and 1300 °C in reducing atmosphere. XRD and SEM/EDX were used to identify mineral transformations and eutectic processes. The eutectic processes were finally simulated with FactSage. Results show that the fusion temperatures of the blended ashes initially decrease and then increase with the blending ratio, a trend that is typical of eutectic melting. Eutectic phenomena are observed in D100, G10D90, and G30D70 in different degrees, which do not appear in G100 and G50D50 for the lack of eutectic reactants. The main eutectic reactants are gehlenite, magnetite, merwinite, and diopside. The FactSage simulation results show that the content discrepancy of merwinite and diopside in the ashes causes the inconsistent eutectic temperatures and eutectic degrees, in turn decrease the fusion temperature of the blended ash and then increase them with the blending ratio.

Suggested Citation

  • Mingke Shen & Kunzan Qiu & Long Zhang & Zhenyu Huang & Zhihua Wang & Jianzhong Liu, 2015. "Influence of Coal Blending on Ash Fusibility in Reducing Atmosphere," Energies, MDPI, vol. 8(6), pages 1-20, May.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:6:p:4735-4754:d:50140
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    References listed on IDEAS

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    1. Ping Wang & Mehrdad Massoudi, 2013. "Slag Behavior in Gasifiers. Part I: Influence of Coal Properties and Gasification Conditions," Energies, MDPI, vol. 6(2), pages 1-23, February.
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    Cited by:

    1. Hongwei Hu & Kun Zhou & Kesheng Meng & Lanbo Song & Qizhao Lin, 2017. "Effects of SiO2/Al2O3 Ratios on Sintering Characteristics of Synthetic Coal Ash," Energies, MDPI, vol. 10(2), pages 1-14, February.
    2. Sida Tian & Yuqun Zhuo & Zhonghua Zhan & Xinqian Shu & Zhizhong Kang, 2016. "Distribution of Clay Minerals in Light Coal Fractions and the Thermal Reaction Products of These Clay Minerals during Combustion in a Drop Tube Furnace," Energies, MDPI, vol. 9(6), pages 1-14, June.
    3. Nawaz, Zanib & Ali, Usman, 2020. "Techno-economic evaluation of different operating scenarios for indigenous and imported coal blends and biomass co-firing on supercritical coal fired power plant performance," Energy, Elsevier, vol. 212(C).

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