Effects of particle filling and gradation on the properties of coal-water slurries blended with semicoke

He, Qihui; Xu, Renfu; Wang, Xin; Feng, Yahui; Zhai, Junjie; Dai, Dongqing; Wu, Shishan; Shen, Jian; Hu, Baixing

doi:10.1016/j.powtec.2023.118229

Cited by 7 publications

(5 citation statements)

References 32 publications

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“…Therefore, to transport smoothly CWS, a primary goal is to make the coal particles stably dispersed. Accordingly, the rheological behavior plays a key role in the stabilization of the CWS system. , For the design and optimization of various processes of CWS technology, a good understanding of the rheological properties of this suspension is important . The properties of dispersant have a noticeably crucial effect on the flow behavior of CWS, and thus, the selection of dispersant is of vital importance.…”

Section: Rheological Behaviormentioning

confidence: 99%

“…For fluids, several typical rheological models have been adopted to describe the relationship between shear stress and shear rate . The Bingham model, having yield stress, shows the linear correlation, and the power law model in absence of yield stress presents the exponent variation.…”

Section: Rheological Behaviormentioning

confidence: 99%

“…Various methods, including landfills, flotation, solvent extraction, sludge composting, thermochemical treatments (pyrolysis, gasification, and incineration), and preparation of a multicomponent slurry, have been developed to manage the industrial wastes based on their types, characteristics, major components, and environmental factors . When the CWS and industrial waste are used to prepare a multicomponent slurry, the waste can be fully utilized to reduce the relevant processing costs and improve the calorific value of the slurry because the CWS has the advantages of scalability, high carbon conversion, and raw material diversity . The application extension of waste materials has aroused wide interests in using plant-derived waste, coal chemical waste, and petroleum processing waste as components of CWS, achieving to utilize the waste and energy cleanly and efficiently.…”

Section: Future Perspectives and Challengesmentioning

confidence: 99%

“…Coal is a nonrenewable and exhaustible energy resource. The rational development and utilization of coal resources are effective ways to save energy and protect the ecological environment, and they have important practical significances for achieving sustainable development of the coal industry. − …”

Section: Introductionmentioning

confidence: 99%

“…For coal particles in CWS, a certain size range is required to guarantee complete combustion and gasification, and a suitable size distribution is also required to attain high filling efficiency. With a reasonable granularity gradation of coal particles, a high-concentration CWS with good stability and fluidity and maximum packing efficiency would be acquired. ,− For instance, coal powders with bimodal particle size distribution obtained by the granularity gradation of fine particles and coarse particles are good for the preparation of CWS …”

Section: Introductionmentioning

confidence: 99%

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Review and Perspectives of Anionic Dispersants for Coal–Water Slurry

Feng

et al. 2023

Energy Fuels

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Dispersants are chemical moieties that modify interfacial characteristics by adsorption at the solid–liquid interface, and they have been widely used in modern industrial production. This review focuses on the research and perspectives of anionic dispersants for coal–water slurry (CWS). Various common anionic dispersants are briefly summarized, including natural and synthetic species. The interactions between coal particles in the CWS suspension, including van der Waals attraction and electrostatic repulsion, are described by the DLVO (Derjaguin–Landau–Verwey–Overbeek) theory. Due to the hydrophobic interaction and the steric effect resulting from the adsorption of polymer dispersants, the extended DLVO theory is introduced to elucidate the various interactions in the CWS system. Based on the interactions between the coal particles, the adsorption behaviors at the coal–water interface, and the interactions between coal and water, the dispersion and stabilization mechanisms are systematically and theoretically discussed. According to the variations of interaction energies between the coal particles, the use of anionic polymer dispersants can weaken the hydrophobic attraction and enhance the steric hindrance and electrostatic repulsion. Also, the rheological behaviors of CWSs are outlined, with emphasis on the pipeline transportation of CWS and the three-parameter Herschel–Bulkley model. Additionally, the properties of anionic dispersants for CWS can be improved by adjusting their chemical structures such as molecular weight, side chain length, rigidity and flexibility of the molecular chain, and variety, quantity, position, and proportion of hydrophobic and hydrophilic groups. In view of the relationships between the structure and property, a direction on the selection and preparation of dispersant for CWS is suggested. Finally, the current challenges and future perspectives of dispersants for CWS are put forward.

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Section: Rheological Behaviormentioning

confidence: 99%

Section: Rheological Behaviormentioning

confidence: 99%

Section: Future Perspectives and Challengesmentioning

confidence: 99%