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28 results on '"Qiao, Yanyu"'

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

Author

Qiao, Yanyu, Fan, Subo, Wu, Xiaolan, Chen, Zhichao, Guan, Shuo, Li, Jiawei, Yuan, Zhenhua, Hou, Jian, and Li, Zhengqi

Subjects
BITUMINOUS coal, COMBUSTION efficiency, CO-combustion, NUMERICAL analysis, FLUE gases, COAL preparation
Abstract

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 O2 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 O2 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%. [ABSTRACT FROM AUTHOR]

Published
2024
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22. Study on the Physical, Chemical and Combustion Characteristics of Pyrolysis Semi-coke

Author

Yuan Zhenhua, Zheng Yu, Zhengqi Li, Qiao Yanyu, Zhichao Chen, Li Jiawei, Lingyan Zeng, and Guan Shuo

Subjects
Materials science, General Chemical Engineering, General Physics and Astronomy, Energy Engineering and Power Technology, chemistry.chemical_element, General Chemistry, Coke, Combustion, Solid fuel, Fuel Technology, chemistry, Chemical engineering, Physical chemical, Pyrolytic carbon, Pyrolysis, Carbon
Abstract

Combustion is an effective method for large-scale utilization of pyrolytic semi-coke (SC), a high order carbon-based solid fuel with low volatile content. The combustion characteristics of SC can b...

Published
2021

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