Free-radical behaviors of co-pyrolysis of low-rank coal and different solid hydrogen-rich donors: A critical review

Wu, Lei; Guan, Yining; Li, Changcong; Shi, Lei; Yang, Sasha; Rajasekhar Reddy, B.; Ye, Gan; Zhang, Qiuli; Liew, Rock Keey; Zhou, Jun; Vinu, R.; Lam, Su Shiung

doi:10.1016/j.cej.2023.145900

Cited by 26 publications

(2 citation statements)

References 197 publications

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“…Hence, advanced technologies for the efficient utilization of low-rank coal are urgently required. Coal pyrolysis has been considered as an attractive method of using this low-rank coal [2][3][4][5]. Thus, it was necessary to reduce the energy consumption of the coal pyrolysis process, which would be more beneficial for saving energy and reducing cost in the downstream industry.…”

Section: Introductionmentioning

confidence: 99%

Fluid Dynamics Investigation in a Cold Flow Model of Internal Recycle Quadruple Fluidized Bed Coal Pyrolyzer

Cao,

Yu,

Wang

et al. 2024

Processes

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Internal recycle quadruple fluidized bed pyrolyzer (IR-QFBP) consists of a dual fluidized bed pyrolyzer and a dual fluidized bed combustor and is proposed in this work. It is a new kind of efficient fluidized bed with high pyrolysis and energy efficiency. IR-QFBP may attract extensive attention because of its compact structure. Cold hydrodynamic characteristics of IR-QFBP are the bases of modeling and designing for the hot one. To fully understand the hydrodynamic characteristics of IR-QFBP, a cold flow model on a laboratory scale was designed and set up; furthermore, the two-fluid model (TFM) based simulation was also carried out. The pressure profiles, fluidization states, velocity profiles, and circulation rates of a solid powder at different operation conditions in IR-QFBP were investigated. The results showed that the stable internal circulation of solid powder can be achieved in IR-QFBP. And different circulation characteristics can be obtained by adjusting the operating conditions.

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Section: Introductionmentioning

confidence: 99%

Fluid Dynamics Investigation in a Cold Flow Model of Internal Recycle Quadruple Fluidized Bed Coal Pyrolyzer

Cao,

Yu,

Wang

et al. 2024

Processes

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“…Lignite is a macromolecular aggregate formed via the condensation of functional groups, such as aromatic rings and aliphatic chains. It is characterized by good chemical reactivity [1]. Understanding the chemical structure of lignite is the core content of coal chemistry, which is the basis for exploring the chemical reaction activity and properties of lignite and has important theoretical value [2].…”

Section: Introductionmentioning

confidence: 99%

Structural Characterization and Molecular Model Construction of Lignite: A Case of Xianfeng Coal

Shi,

Zhu,

Chen

et al. 2024

Energies

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The object of the study is lignite. Analytical testing techniques, such as elemental analysis, 13C nuclear magnetic resonance (13C NMR) spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and high-resolution transmission electron microscopy (HRTEM), were used to acquire information on the structural parameters of lignite. The aromaticity of Xianfeng lignite is 43.57%, and the aromatic carbon structure is mainly naphthalene and anthracene/phenanthrene. The aliphatic carbon structure is dominated by cycloalkanes, alkyl side chains, and hydrogenated aromatics. Oxygen is mainly present in ether oxygen, carboxyl, and carbonyl groups. Nitrogen is mainly in the form of pyrrole nitrogen and quaternary nitrogen. Sulfur is mainly thiophene sulfur. According to the analysis results, the molecular structure model of XF lignite was constructed. The molecular formula is C184H172O39N6S2. The 2D structure was converted to a 3D structure using computer simulation software and optimized. The optimized model has a remarkable stereoconfiguration, and the aromatic lamellae are irregularly arranged in space. The aromatic rings were mainly connected by methylene, hypomethylene, methoxy, and aliphatic rings. In addition, the simulated 13C NMR spectra are in good agreement with the experimental spectra. This shows the rationality of the 3D chemical structure model.

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Calcium oxide waste-based catalysts for biodiesel production and depollution: a review

Teo,

Chia,

Nordin

et al. 2024

Environ Chem Lett

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Free-radical behaviors of co-pyrolysis of low-rank coal and different solid hydrogen-rich donors: A critical review

Cited by 26 publications

References 197 publications

Fluid Dynamics Investigation in a Cold Flow Model of Internal Recycle Quadruple Fluidized Bed Coal Pyrolyzer

Fluid Dynamics Investigation in a Cold Flow Model of Internal Recycle Quadruple Fluidized Bed Coal Pyrolyzer

Structural Characterization and Molecular Model Construction of Lignite: A Case of Xianfeng Coal

Calcium oxide waste-based catalysts for biodiesel production and depollution: a review

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