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Experimental Investigation of Ash Deposit Behavior during Co-Combustion of Bituminous Coal with Wood Pellets and Empty Fruit Bunches

Author

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  • Tae-Yong Jeong

    (School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan 46241, Korea)

  • Lkhagvadorj Sh

    (School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan 46241, Korea)

  • Jong-Ho Kim

    (School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan 46241, Korea)

  • Byoung-Hwa Lee

    (Boiler R&D center, Doosan Heavy Industries and Construction, Volvoro 22, Seongsangu, Changwon 51711, Korea)

  • Chung-Hwan Jeon

    (School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan 46241, Korea
    Pusan Clean Coal Center, Pusan National University, 2, Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan 46241, Korea)

Abstract

In Korea, oil-palm empty fruit bunches (EFBs), which are byproducts of the crude palm-oil milling process, are among the most promising potential energy sources for power plants. However, the slagging and fouling characteristics of EFBs during combustion have not yet been fully studied. Accordingly, in this study, we investigated the fundamental ash behavior of EFBs in comparison to that of wood pellets (WPs) using a thermomechanical analyzer (TMA) and a drop-tube furnace (DTF). Ash melting and the deposition of ash particles were investigated with traditional prediction indices at several biomass blending ratios. The results demonstrated that, as the ratio of WPs to EFBs increases, the melting temperature decreases and the slagging propensity increases because of the increased biomass alkali content. Moreover, the penetration derived using the TMA shows a higher melting peak at which rapid melting occurs, and the melting temperature distribution is decreased with increased biomass blending. Conversely, the DTF results show different phenomena for ash deposition under the same blending conditions. Blend ratios approaching 10% WP and 15% EFB result in gradual decreases in ash deposition tendencies because of the lower ash contents of the co-combusted mass compared to that of the single coal ash. Further biomass addition increases ash deposition, which is attributable to ash agglomeration from the biomass. Thus, this study demonstrates that blending ratios of 10% WP and 15% EFB provide optimal conditions for co-combustion with the selected bituminous coal. In addition, it is shown that the slagging propensity of EFB is higher than that of WP owing to its ash content and simultaneous agglomeration.

Suggested Citation

  • 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.
  • Handle: RePEc:gam:jeners:v:12:y:2019:i:11:p:2087-:d:236026
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    References listed on IDEAS

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    4. Hariana, & Putra, Hanafi Prida & Prabowo, & Hilmawan, Edi & Darmawan, Arif & Mochida, Keiichi & Aziz, Muhammad, 2023. "Theoretical and experimental investigation of ash-related problems during coal co-firing with different types of biomass in a pulverized coal-fired boiler," Energy, Elsevier, vol. 269(C).
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    7. 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.

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