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Published on: December 5, 2019
Simultaneous desulfurization and denitrification from flue gas by Ferrate(VI)
Yi Zhao1, Yinghui Han, Tianzhong Ma
1School of Environmental Science & Engineering, North China Electric Power University, People's Republic of China. zhaoyi9515@163.com
A novel semidry process effectively removes sulfur dioxide (SO₂) and nitrogen monoxide (NO) from flue gas using ferrate(VI) absorbent. This method achieved high removal efficiencies, offering a promising solution for industrial emissions control.
Area of Science:
- Environmental Chemistry
- Chemical Engineering
- Materials Science
Background:
- Industrial flue gases contain significant amounts of sulfur dioxide (SO₂) and nitrogen monoxide (NO), contributing to air pollution and acid rain.
- Effective and simultaneous removal of these pollutants is crucial for environmental protection and regulatory compliance.
Purpose of the Study:
- To develop and investigate an innovative semidry process for the simultaneous removal of SO₂ and NO from flue gas.
- To optimize the process using ferrate(VI) absorbent under circulating fluidized bed (CFB) conditions.
- To elucidate the reaction mechanism for simultaneous desulfurization and denitrification.
Main Methods:
- Preparation of ferrate(VI) absorbent and its application in humidified water within a CFB system.
- Experimental investigation of factors influencing removal efficiencies, including ferrate(VI) concentration, pH, temperature, residence time, and molar ratio.
- Analysis of SO₂ and NO removal efficiencies under varying operational parameters.
Main Results:
- Achieved high removal efficiencies: 96.1% for SO₂ and 67.2% for NO under optimal conditions.
- Identified optimal conditions: 0.03 M ferrate(VI) concentration, pH 9.32, 130 °C flue gas temperature, 2.2 s residence time, and Ca/(S+N) molar ratio of 1.2.
- Proposed a reaction mechanism for the simultaneous desulfurization and denitrification process.
Conclusions:
- The developed semidry process using ferrate(VI) is highly effective for simultaneous SO₂ and NO removal.
- The study provides critical insights into process optimization and reaction pathways for industrial applications.
- This innovative approach offers a viable solution for mitigating air pollution from industrial emissions.
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