Numerical analysis on effect of blend ratio on co-combustion characteristics of semi-coke and bituminous coal in swirl burner

Semi-coke is the coproduct of low-rank coal in the preparation of oil and gas, but the current utilization rate of fine-powder semi-coke is low, which limits the development of the low-rank coal pyrolysis industry. This paper uses the numerical simulation method to study the co-combustion characteri...

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Bibliographic Details
Published in:Combustion science and technology 2024-03, Vol.196 (4), p.504-523
Main Authors: Qiao, Yanyu, Fan, Subo, Wu, Xiaolan, Chen, Zhichao, Guan, Shuo, Li, Jiawei, Yuan, Zhenhua, Hou, Jian, Li, Zhengqi
Format: Article
Language:English
Subjects:
Bituminous coal
Burnout
Coal
Coke
Coke fired furnaces
Coke oven gas
Combustion
Combustion efficiency
Flue gas
Gas temperature
Large-scale semicoke co-combustion
NOx reduction
Nozzles
Numerical analysis
Pyrolysis
Swirl burner
Synergistic effect
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Summary:Semi-coke is the coproduct of low-rank coal in the preparation of oil and gas, but the current utilization rate of fine-powder semi-coke is low, which limits the development of the low-rank coal pyrolysis industry. This paper uses the numerical simulation method to study the co-combustion characteristics of a large proportion of bituminous coal mixed with semi-coke in a swirl burner. The results show that, in the primary combustion region, with the increase of the blend ratio of semi-coke, the flue gas temperature and NO concentration are lower, and the O 2 concentration increase is higher. In the over-fired air (OFA) nozzle area, with the increase of the blend ratio of semi-coke, the flue gas temperature and NO concentration are higher, and O 2 concentration is lower. In addition, with the increase of the blend ratio of semi-coke, the main combustion position of the fuel is transferred to the vicinity of the OFA nozzle area, which weakens the degree of air-staging combustion of the furnace. The synergistic effect of co-combustion of semi-coke and bituminous coal helps to reduce the NO concentration at the furnace outlet and improve the combustion efficiency. By comprehensive considering the stable operation of the boiler, burnout rate, and NO emission concentration, the recommended blend ratio of semi-coke should not exceed 60%.
ISSN:0010-2202
1563-521X
DOI:10.1080/00102202.2022.2085038