Study on CO<sub>2</sub> absorption performance of sintering flue gas using MEA-based mixed amine solutions

YANG Shuqin; WANG Hui; ZHANG Wenbo; DONG Yuan; ZHU Xiaohua

doi:10.13205/j.hjgc.202509017

Volume 43 Issue 9

Sep. 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(9): 157-164

YANG Shuqin, WANG Hui, ZHANG Wenbo, DONG Yuan, ZHU Xiaohua. Study on CO2 absorption performance of sintering flue gas using MEA-based mixed amine solutions[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(9): 157-164. doi: 10.13205/j.hjgc.202509017

Citation:

YANG Shuqin, WANG Hui, ZHANG Wenbo, DONG Yuan, ZHU Xiaohua. Study on CO₂ absorption performance of sintering flue gas using MEA-based mixed amine solutions[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(9): 157-164. doi: 10.13205/j.hjgc.202509017

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Study on CO₂ absorption performance of sintering flue gas using MEA-based mixed amine solutions

doi: 10.13205/j.hjgc.202509017

YANG Shuqin^1,2,
WANG Hui^1,2,
ZHANG Wenbo^1,2,
DONG Yuan^1,2,
ZHU Xiaohua^{1,2
,}

1. Central Research Institute of Building and Construction, Co., Ltd., MCC Group, Beijing 100088, China;
2. State Key Laboratory of Iron and Steel Industry Environmental Protection, Beijing 102600, China

Received Date: 2025-02-06
Available Online: 2025-11-05
Publish Date: 2025-09-01

Abstract

Abstract

China's Dual Carbon Goals have imposed stringent requirements on carbon emission reduction in the steel industry. The sintering process， a critical step in steel production， contributes up to 40% of the industry's total carbon emissions. Currently， chemical absorption is the predominant method for CO₂ capture in industrial applications. However， research on chemical absorption for sintering flue gas， which is characterized by its complex composition， remains limited. Sintering flue gas typically contains lower CO₂ concentrations and higher levels of impurities， such as SO₂ and NO₂， which significantly affect CO₂ capture efficiency. Among these impurities， SO₂ has a more pronounced impact than NO₂ due to its higher reactivity with amine-based absorbents， leading to reduced absorption performance. To address these challenges， this study focused on developing high-efficiency CO₂ absorbents tailored for sintering flue gas. The research began with an analysis of the composition of sintering flue gas from a representative sintering machine， revealing that the low CO₂ concentration and the presence of SO₂ and NO₂ are critical factors influencing absorption efficiency. To investigate the CO₂ absorption efficiency of different chemical absorbents for sintering flue gas， this study first determined the optimal process conditions by controlling the mass fraction of absorbents and temperature as single factors. Experiments identified the 30% MEA solution with the highest absorption efficiency as the primary amine. Subsequently， three binary composite solutions （MEA-MDEA， MEA-PZ， and MEA-K₂CO₃） and one ternary composite solution （MEA-PZ-MDEA） were adopted to analyze the CO₂ absorption performance under different conditions.The results demonstrated that the CO₂ absorption performance followed the order of MEA-PZ-MDEA > MEA-PZ > MEA-MDEA > MEA-K₂CO₃. The ternary blend （MEA-PZ-MDEA） exhibited the highest absorption efficiency， attributed to the synergistic effects of PZ's fast reaction kinetics and MDEA's low regeneration energy requirements. Additionally， the study highlights the importance of optimizing absorbent composition and operating conditions to mitigate the adverse effects of SO₂ and NO₂ on CO₂ capture. It provides valuable insights into the development of advanced absorbents for sintering flue gas， offering a potential pathway for the steel industry to achieve significant carbon emission reductions. Future work should focus on scaling up the process and further improving the absorbents' resistance to impurities.
- sintering flue gas,
- CO₂,
- mixed amines,
- absorption efficiency,
- binary mixture,
- ternary mixture,
- chemical absorption

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References(20)

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