1. Influence of the Parallel C-Layer Secondary Air on Flow, Combustion and Nox Generation Characteristics of a 600mwe FW Down-Fired Boiler Retrofitted with a Stable Combustion Organization Mode.
- Author
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Du, He, Li, Zhengqi, Liu, Zheng, Zhang, Mingdi, Chen, Zhichao, Song, Jian, Fang, Fan, and Xiao, Ronghua
- Subjects
COMBUSTION ,GAS furnaces ,COAL combustion ,FLUE gases ,FLY ash ,BOILERS ,COAL-fired boilers ,RETROFITTING ,AIR flow - Abstract
To improve the low-load stable combustion capacity of a low-grade coal-fired boiler, this study proposed to reform C-layer secondary air, which was then used to improve the ignition and combustion stability of coal/airflow of a 600 MWe Foster Wheeler down-fired boiler. Cold airflow experiments and industrial measurements were carried out to investigate the influence of the new C-layer secondary air on the aerodynamic and combustion characteristics at low load under different C-layer secondary air ratios and damper openings, respectively. The flow and mixing characteristics of the C-layer secondary air and coal/airflow, the flue gas temperature and NO
x , O2 , and CO concentration distributions in the furnace at low load were examined. With increase in the C-layer secondary air ratio, the flow range of coal/airflow gradually expanded. The mixing distance first increased and then decreased. At an air ratio of 25%, the mixing distance was the longest. Industrial measurements showed that compared with that at the C-layer secondary air damper opening of 0%, the coal/airflow ignited earlier at 40% (corresponding to the C-layer secondary air ratio of 23.73%), and the flue gas temperature in the furnace increased substantially. At C-layer secondary air damper opening of 0%, 20%, and 40%, carbon content in the fly ash was 4.62%, 5.32%, and 4.20%, respectively. The respective NOx emissions at the furnace exits were 450 mg/Nm3 , 378 mg/Nm3 , and 427 mg/Nm3 , (O2 = 6%). In actual operation, 40% is recommended as the optimal C-layer secondary air damper opening. [ABSTRACT FROM AUTHOR]- Published
- 2024
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