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Numerical Study on NOx Emissions of Methane Re-Combustion in a 600 MWe Coal-Fired Boiler
Departments of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, China
Departments of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, China
Departments of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, China
Departments of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, China
Departments of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, China
Departments of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, China
Departments of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, China
- 1 Departments of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, China
- 2 Departments of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, China
- 3 Departments of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, China
- 4 Departments of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, China
- 5 Departments of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, China
- 6 Departments of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, China
- 7 Departments of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, China
Energy and Power Engineering·Volume 12 (2020)·Pages 101–107·Published 26 March 2020·DOI10.4236/epe.2020.123008
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Abstract
The fuel staging combustion technology is a promising low NOx combustion technology for coal-fired boiler. In order to reduce NOx emissions, the burners of a 600 MWe coal-fired boiler are retrofitted in which methane gas is selected as a secondary fuel for re-combustion. The CFD models of combustion process are built to investigate effects of the methane gasratio on combustion process and NOx emissions. A total of 4 cases are numerically studied, including the pure coal combustion case, the coal combustion with 7.5%, 10%, 12.5% of methane gas re-combustion cases respectively. The results show that the re-combustion of methane can reduce the temperature at primary combustion zone, but increase the temperatures at the re-combustion area and the furnace outlet. The NOx concentration at the furnace outlet reduces with the increasing methane gas ratio. Methane re-combustion can greatly benefit to the NOx emissions reduction.
KeywordsNumerical SimulationRe-CombustionNOx Emission Reduction
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