Experimental study on oxy-fuel combustion behavior of lignite char and carbon transfer mechanism with isotopic tracing method

Geng, Chenchen; Shao, Yingjuan; Bian, Zhoufeng; Zhong, Wenqi

doi:10.1016/j.cej.2019.123977

Cited by 19 publications

(2 citation statements)

References 36 publications

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“…308 Because of the small scale, MFB can be relatively easily combined with other experimental techniques and at a lower cost than would be required from larger fluidized beds. For example, Geng et al 309 carried out combustion experiments in an MFB reactor in conjunction with isotopic labeling. By tracing 18 O atoms, the authors demonstrated the extent of the CO 2 gasification during oxy-fuel char combustion.…”

Section: New Research Frontiersmentioning

confidence: 99%

Combustion of Biomass in Fluidized Beds: A Review of Key Phenomena and Future Perspectives

Kwong

Marek

2021

Energy Fuels

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This review presents recent advances in research on fluidized bed combustion of solid biomass. While the main focus is on thermochemical processes occurring in fluidized beds, applicable investigations on biomass combustion from other research areas are also described as they often provide fundamental insight about the processing of biomass, applicable also in the context of fluidized beds. This review aims to summarize lessons learned and indicate some remaining gaps in the existing body of knowledge. The review discusses combustion in separate stages, such as drying, pyrolysis, and homo-and heterogeneous combustion, and characterizes how fluidized beds affect combustion, discussing heat and mass transfer, material segregation, and bed agglomeration. Finally, advances in new research trends and the prospects for technology development are considered, highlighting the chemical-looping technology with its inherent potential for carbon capture, scale-up of advanced computational models, and progress in spectroscopic and tomographic studies applied to combustion.

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Section: New Research Frontiersmentioning

confidence: 99%

Combustion of Biomass in Fluidized Beds: A Review of Key Phenomena and Future Perspectives

Kwong

Marek

2021

Energy Fuels

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“…The actual combustion combines the oxidation reaction and gasification reaction in O 2 /CO 2. Geng et al confirmed the gasification reaction (C + CO 2 = 2CO) between C and CO 2 in oxy-fuel combustion by the isotope tracer 18 O. Besides, the contribution of the gasification reaction to carbon conversion decreases while O 2 concentrations and particle sizes increase.…”

Section: Introductionmentioning

confidence: 99%

Gasification Decoupling during Pressurized Oxy-Coal Combustion by the Isotope Tracer Method

Hong

Duan

et al. 2022

Energy Fuels

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As one of the crucial means of CO 2 emission reduction in coal-fired power plants, oxy-fuel combustion has attracted widespread attention for years. Since oxy-fuel combustion and air combustion vary considerably in the gaseous environment, the gasification reaction has proved to be non-negligible. Exploring the promotion and competition mechanism between oxidation and gasification reactions will help regulate the combustion characteristics of char through pressure and atmosphere. Thence, it is critical to explore the influence of the gasification reaction on oxy-fuel combustion and decouple the contribution ratio of the gasification reaction. The experiments under different conditions are performed on a laboratory-scale pressurized fixed bed in the research. The C atom in CO 2 gas is labeled with 5.95% 13 C; thus, the contribution ratio of the gasification and oxidation reactions can be decoupled by tracking the 13 C atom abundance in CO 2 and CO. The results are apparent: the pressure, temperature, and oxygen concentration increase, the combustion process is promoted, the combustion rate increases significantly, and the burnout time (t 80 ) decreases. In addition, the problem of the low combustion rate under oxy-fuel combustion can be solved by increasing the O 2 concentration. The decoupling results indicate that the contribution ratio of the gasification reaction increases with increasing pressure and temperature. As the CO 2 partial pressure increases, the gasification reaction is promoted. With the increase of temperature, the gasification reaction growth rate is faster than the oxidation reaction. In contrast, the contribution rate shows a decreasing trend due to the increased O 2 concentration promoting the oxidation reaction.

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Simulations on pressurized oxy-coal combustion and gasification by molecular dynamics method with ReaxFF

Qiu

Zhong

2022

Advanced Powder Technology

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Experimental study on oxy-fuel combustion behavior of lignite char and carbon transfer mechanism with isotopic tracing method

Cited by 19 publications

References 36 publications

Combustion of Biomass in Fluidized Beds: A Review of Key Phenomena and Future Perspectives

Combustion of Biomass in Fluidized Beds: A Review of Key Phenomena and Future Perspectives

Gasification Decoupling during Pressurized Oxy-Coal Combustion by the Isotope Tracer Method

Simulations on pressurized oxy-coal combustion and gasification by molecular dynamics method with ReaxFF

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