1. Influence of primary air cone length on combustion characteristics and NOx emissions of a swirl burner from a 0.5 MW pulverized coal-fired furnace with air staging.
- Author
-
Ti, Shuguang, Chen, Zhichao, Li, Zhengqi, Kuang, Min, Xu, Guangyin, Lai, Jinping, and Wang, Zhenfeng
- Subjects
- *
COAL-fired furnaces , *NITROGEN oxides emission control , *COMBUSTION , *BURNERS (Technology) , *PULVERIZED coal - Abstract
This paper presents experimental research on cold flow, combustion characteristics, and NO x emissions of a swirl burner with air staging. The aim of the research is to investigate the influence of primary air cone length on the swirl burner performance. Cold flow air experiments on a centrally fuel-rich swirl burner with an over-fire air ratio of 25% were performed, and it was observed that when the dimensionless primary-air cone length (i.e., L p / L i , L p and L i respectively denoting the primary-air cone length in the cold-modeling experiments and inner secondary-air cone length) increases from 0 to 0.75, the diameter and length of the recirculation zone reduces from 0.91 d and 1.51 d to 0.68 d and 0.57 d , respectively. An investigation was conducted in a 0.5 MW laboratory furnace in order to optimize the primary-air cone length of a centrally fuel-rich swirl burner. The flame stability, performance of ignition, and burnout are significantly improved by decreasing the primary-air cone length. The NO x emissions measured at the furnace exit with a cone length L p / L i = 0 decreased by 50.3% compared to those measured with a cone length L p / L i = 1.0. Based on the evaluation of flame stability, performance of the ignition, burnout, and low NO x emissions, the optimum value of primary-air cone length was observed to be L p / L i = 0. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF