Characteristics of SO 2 Removal and Heat Recovery of Flue Gas Based on a Hybrid Flue Gas Condenser

Hyeonrok Choi, Won Yang, Yongwoon Lee () and Changkook Ryu
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Hyeonrok Choi: Research Institute of Sustainable Development Technology, Korea Institute of Industrial Technology, Cheonan 30156, Republic of Korea
Won Yang: Research Institute of Sustainable Development Technology, Korea Institute of Industrial Technology, Cheonan 30156, Republic of Korea
Yongwoon Lee: Research Institute of Sustainable Development Technology, Korea Institute of Industrial Technology, Cheonan 30156, Republic of Korea
Changkook Ryu: School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea

Energies, 2024, vol. 17, issue 19, 1-12

Abstract: A flue gas condenser (FGC) system recovers heat from exhaust flue gases in energy production and chemical plants, reducing air pollution due to dust, SOx, and HCl. An FGC system is divided into indirect contact condenser (ICC) and direct contact condenser (DCC) types. In an ICC, the exhaust gases do not mix with the working fluid, and a water film is formed during flue gas condensation for partial SOx removal. In a DCC, direct mixing of the exhaust flue gas with the cooling fluid (mainly water) occurs, with simultaneous absorption of SOx. In this study, we investigated the SO 2 removal efficiency and heat recovery of an ICC, a DCC, and a DCC–ICC hybrid system, and compared the results of the hybrid system with those obtained for a single DCC type at the same liquid-to-gas (L/G) ratio. The SO 2 removal characteristics of the hybrid system were examined based on the L/G ratio and absorbent-to-SO 2 molar ratio. In the reference ICC-type FGC system, the exit temperature of the mixed gas was 28 °C, with the condensed water ratio and heat recovery efficiency being 80.9% and 93.4%, respectively. At an L/G ratio of 1.5–3.5, the SO 2 removal efficiency of a single DCC was 31.5–65.9%, whereas that of the hybrid FGC system (with packing material) increased from 47.1% to 72.3%, which further increased to ~90% upon the addition of NaOH at a molar ratio of 0.7 and an L/G ratio of 1.5.

Keywords: flue gas condenser; indirect contact condenser; direct contact condenser; SO 2; removal; heat recovery (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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