Characteristics of SO2 Removal and Heat Recovery of Flue Gas Based on a Hybrid Flue Gas Condenser

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...

Full description

Saved in:
Bibliographic Details
Published in:Energies (Basel) 2024-10, Vol.17 (19), p.4799
Main Authors: Choi, Hyeonrok, Yang, Won, Lee, Yongwoon, Ryu, Changkook
Format: Article
Language:English
Subjects:
Air pollution
Cooling
Corrosion
direct contact condenser
Energy efficiency
Flue gas
flue gas condenser
Gases
Heat exchangers
heat recovery
Heat recovery systems
Heavy metals
indirect contact condenser
Outdoor air quality
Phase transitions
removal
SO2
Temperature
VOCs
Volatile organic compounds
Water treatment
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 SO2 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 SO2 removal characteristics of the hybrid system were examined based on the L/G ratio and absorbent-to-SO2 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 SO2 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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en17194799