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Utilization of CFBC Fly Ash as a Binder to Produce In-Furnace Desulfurization Sorbent

Author

Listed:
  • Chulseoung Baek

    (R&D Department, Korea Institute of Limestone and Advanced Materials, Chungcheongbuk-do 27003, Korea)

  • Junhyung Seo

    (R&D Department, Korea Institute of Limestone and Advanced Materials, Chungcheongbuk-do 27003, Korea)

  • Moonkwan Choi

    (R&D Department, Korea Institute of Limestone and Advanced Materials, Chungcheongbuk-do 27003, Korea)

  • Jinsang Cho

    (R&D Department, Korea Institute of Limestone and Advanced Materials, Chungcheongbuk-do 27003, Korea)

  • Jiwhan Ahn

    (Center for Carbon Mineralization, Climate Change Mitigation and Sustainability Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Korea)

  • Kyehong Cho

    (R&D Department, Korea Institute of Limestone and Advanced Materials, Chungcheongbuk-do 27003, Korea)

Abstract

Circulating fluidized bed combustion (CFBC) power generation technology is known to efficiently reduce the emission of air pollutants, such as SO 2 and NO 2 , from coal combustion. however, CFBC coal ash contains high contents of free CaO, making it difficult to recycle. This research has been conducted to find ways to use the self-hardening property of CFBC coal ash, one of its inherent characteristics. As part of these efforts, the present study intended to investigate the properties and desulfurization efficiency of Ca-based desulfurization sorbents using CFBC fly-ash as a binder. Limestone powder was mixed with CFBC fly-ash and Ca(OH) 2 to fabricate desulfurization sorbents, and it generated hydrate of cement, including portlandite, ettringite, and calcium silicate, etc. The compressive strength of the desulfurization absorbent prepared by CFBC fly ash and Ca(OH) 2 was 72–92% that of the desulfurized absorbent prepared by using general cement as a binder. These absorbents were then compared in terms of desulfurization efficiency using a high-temperature fluidized bed reactor. It was confirmed that the desulfurization absorbents fabricated using CFBC fly-ash as a binder achieved the best performance in terms of absorption time, which reflects the time taken for them to remove over 90% of high-concentration SO 2 gas, and the conversion ratio, which refers to the ratio of CaO turning into CaSO 4 .

Suggested Citation

  • Chulseoung Baek & Junhyung Seo & Moonkwan Choi & Jinsang Cho & Jiwhan Ahn & Kyehong Cho, 2018. "Utilization of CFBC Fly Ash as a Binder to Produce In-Furnace Desulfurization Sorbent," Sustainability, MDPI, vol. 10(12), pages 1-17, December.
    • Handle: RePEc:gam:jsusta:v:10:y:2018:i:12:p:4854-:d:191749
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    Citations

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    Cited by:

    1. Katja Ohenoja & Janne Pesonen & Juho Yliniemi & Mirja Illikainen, 2020. "Utilization of Fly Ashes from Fluidized Bed Combustion: A Review," Sustainability, MDPI, vol. 12(7), pages 1-26, April.
    2. Valdas Rudelis & Tadas Dambrauskas & Agne Grineviciene & Kestutis Baltakys, 2019. "The Prospective Approach for the Reduction of Fluoride Ions Mobility in Industrial Waste by Creating Products of Commercial Value," Sustainability, MDPI, vol. 11(3), pages 1-18, January.
    3. Lai Quang Tuan & Thriveni Thenepalli & Ramakrishna Chilakala & Hong Ha Thi Vu & Ji Whan Ahn & Jeongyun Kim, 2019. "Leaching Characteristics of Low Concentration Rare Earth Elements in Korean (Samcheok) CFBC Bottom Ash Samples," Sustainability, MDPI, vol. 11(9), pages 1-11, May.

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