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Experimental study on the simultaneous desulfurization and denitrification by duct injection
Yi Zhao1, Yan-chun Fu, Ma Shuang-chen
1School of Environmental Science & Engineering, North China Electric Power University, Baoding 071003, China. hgxzy@sina.com
Journal of Environmental Sciences (China)
|October 22, 2004
Summary
A novel absorbent efficiently removes sulfur dioxide (SO2) and nitrogen oxides (NOx) from flue gas. This cost-effective method offers high removal rates and simple waste disposal, showing great industrial potential.
Area of Science:
- Environmental Engineering
- Chemical Engineering
- Materials Science
Background:
- Flue gas treatment is crucial for reducing air pollution from industrial sources.
- Simultaneous desulfurization and denitrification (DND) processes are sought for efficiency and cost-effectiveness.
- Fly ash and lime are abundant industrial byproducts with potential absorbent properties.
Purpose of the Study:
- To develop and evaluate a highly active absorbent for simultaneous SO2 and NOx removal.
- To investigate the influential factors affecting the absorbent's capacity.
- To assess the economic and operational advantages over traditional methods.
Main Methods:
- Preparation of an absorbent based on oxidized fly ash, lime, and additives.
- Experimental testing using fixture bed and duct injection for simultaneous desulfurization and denitrification.
- Analysis of influential factors including molar ratio, temperature, and humidity.
- Investigation of the SO2 and NOx removal mechanisms.
Main Results:
- Achieved absorptive capacities of 120.7 mg for SO2 and 43.7 mg for NOx at a Ca/(S + N) molar ratio of 1.2.
- Reached removal efficiencies of 87% for SO2 and 76% for NOx.
- Identified optimal flue gas conditions: approximately 50°C temperature and 5% humidity.
- Spent absorbent was obtained as a dry powder, simplifying disposal.
Conclusions:
- The developed fly ash-based absorbent demonstrates high efficiency for simultaneous SO2 and NOx removal.
- The process offers lower cost, simpler configuration, and easier spent absorbent disposal compared to traditional dry flue gas desulfurization (FGD).
- The study provides valuable references for industrial application, with vast potential globally.