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Evaluation of SO2 Absorption Efficiency for Calcined Oyster Shell Slurry Using a Simulated Spray Type-flue Gas Desulfurization (FGD) System: A Comparative Study with Limestone Slurry
모사 Spray Type 배연탈황설비를 이용한 소성패각 슬러리의 SO2 흡수능 평가: 석회석과의 비교연구
Econ. Environ. Geol. 2019 Apr;52(2):119-28
Published online April 30, 2019;  https://doi.org/10.9719/EEG.2019.52.2.119
Copyright © 2019 the Korean society of economic and environmental gelology.

Seok-Hwi Kim1, Bum-Uh Hong1, Jin-Won Lee2, Wang-Seok Cha2, Kangjoo Kim2* and Bo-Kyung Moon3
김석휘1 ·홍범의1 ·이진원2 ·차왕석2 ·김강주2* ·문보경3

1Center for Plant Engineering, Institute for Advanced Engineering, Yongin, 17180, Korea
2Department of Environmental Engineering, Kunsan National University, Kunsan 54150, Korea
3Korea Western Power, Co., Ltd., Taean 32140, Korea
1고등기술연구원 플랜트엔지니어링센터, 2군산대학교 환경공학과, 3한국서부발전(주)
Received November 16, 2018; Revised April 4, 2019; Accepted April 4, 2019.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
About 300,000 tones of oyster shell are annually produced in Korea and, thus, a massive recycling plan is required. Many desulfurizing studies using oyster shells with chemical composition of CaCO3 have been performed so far; however, most of them have focused on dry desulfurization. This study investigates the possibility of using oyster shells for wet desulfurization after calcination. For this, a simulated wet desulfurization facility of spray type was devised and compared the SOx-stripping characteristics of calcined oyster shell with those of limestone. The calcined oyster shell slurry indicate a better desulfurizability than the slurries of raw shell or limestone because the oyster shell transformed to a more reactive phase (Ca(OH)2) by the calcination and hydration. Because of this reason, when the calcined oyster shell slurries were used, the reaction residue showed the higher gypsum (CaSO4·2H2O) contents than any other cases. In the continuous desulfurization experiments, calcined oyster shell slurry showed a wider pH variation than limestone or raw oyster shell slurries, another clear indication of high reactivity of calcined oyster shells for SO2 absorption. Our study also shows that the efficiency of wet desulfurization can be improved by the use of calcined oyster shells.
Keywords : wet desulfurization, oyster shell, calcination, portlandite, limestone, coal-burning power plant

 

April 2019, 52 (2)