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

Chulseoung Baek, Junhyung Seo, Moonkwan Choi, Jinsang Cho, Jiwhan Ahn and Kyehong Cho
Additional contact information
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

Sustainability, 2018, vol. 10, issue 12, 1-17

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 .

Keywords: CFBC; fly-ash; self-hardening; limestone; sorbent; desulfurization (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

Downloads: (external link)
https://www.mdpi.com/2071-1050/10/12/4854/pdf (application/pdf)
https://www.mdpi.com/2071-1050/10/12/4854/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:10:y:2018:i:12:p:4854-:d:191749

Access Statistics for this article

Sustainability is currently edited by Ms. Alexandra Wu

More articles in Sustainability from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().