Rheological properties of water-coal slurries based on brown coal in the presence of sodium lignosulfonates and alkali

Savitskii, D. P.; Makarov, A. S.; Zavgorodnii, V. A.

doi:10.3103/s0361521909050127

Cited by 6 publications

(5 citation statements)

References 3 publications

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“…It should be noted that CWF (G) samples have a sufficient share of mineral impurities (1.7 times higher than for CWF (D) samples) [21]. That is why it took nearly 13 % more time for the solid residue to burn as compared to CWF (D), while the temperature of the solid residue combustion was 80 … 100 °С lower, which is 870 °С at t oven = 700 °С.…”

Section: Specifics Of Gas Coal (G) Cwf Combustionmentioning

confidence: 97%

“…CWF for experimental research was made up in A.V.Dumansky Institute of Colloid and Water Chemistry in the Department of Physical and Chemical Mechanics of Disperse Systems (Kiev, Ukraine). The technology of fuel production, which was developed by the department employees under the supervision of professor A.S. Makarov [21][22][23], ensured the necessary rheological characteristics (viscosity ≤ 1 Pa•s) and sedimenting stability during a week [21]. Besides, the fuel was additionally mixed before the experiment in order to ensure higher homogeneity.…”

Section: Characteristics Of Coal and Cwfmentioning

confidence: 99%

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The Main Regularities of Ignition and Combustion of Coal-Water Fuels Produced from Brown, Flame and Gas Coals

Pinchuk

2018

JERA

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An experimental investigation was carried out of coal-water fuel (CWF) drops ignition and combustion. CWF examples were produced by using of coal of different metamorphic stages, including brown coal, flame coal, and gas coal. The processes of combustion and ignition of CWF took place in the air. Time-temperature dependences of ignition and combustion processes were obtained; basic stages of CWF combustion were established and investigated; combustion completeness was defined and ash residue structure and properties were investigated during the experimental research. Influence of the working medium temperature on the time duration of each burning stage was defined. Generalization of results was carried out. It is shown, that duration of the volatiles combustion stage doesn’t depend on the medium temperature and stay constant for each of coal grade. Time interval before CWF ignition can be described with power-type dependence, which is identical for all metamorphic stages of coal. The maximum temperature of CWF combustion grows linearly in respect to the medium temperature in the oven.

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Section: Specifics Of Gas Coal (G) Cwf Combustionmentioning

confidence: 97%

Section: Characteristics Of Coal and Cwfmentioning

confidence: 99%

The Main Regularities of Ignition and Combustion of Coal-Water Fuels Produced from Brown, Flame and Gas Coals

Pinchuk

2018

JERA

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“…LSs can be used as concrete admixtures. Also, they are studied as the dispersants for clay, coal–water suspension, pesticide formulation, agricultural chemicals, etc. − …”

Section: Brief Description Of Various Anionic Dispersants For Cwsmentioning

confidence: 99%

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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“…C h e r n e t s k a y a -B e l e t s k a y a become the basis for further research and development in the field of pipeline transport. Works [2,3] consider the laws of flow of bulk materials using pneumatic and hydraulic methods of transportation. The basis of this theory is separation of transported materials into classes.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…Works [1,2] give the theory of sound, shock and kinematic waves and oscillatory motions in two-phase media. On the basis of methods and approaches outlined in sources [5,6], there is considered mechanics of oscillation and vibro-pneumatic conveying of bulk materials with regard to flow mode of individual particles aloft in suspension.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Improving industrial pipeline transport using research of regularities of flow of mixtures in material pipeline

Chernetskaya-Beletskaya

Guschin

Shvornikova

et al. 2017

EEJET

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Виконано дослідження явищ, що відбува-ються в транспортному трубопроводі при переміщенні сумішей в нестаціонарних режи-мах масопереносу. Запропонована реологічна модель руху неньютонівських рідин. Показано, що стохастичні режими руху сумішей вини-кають при переході через перемежуваємість, тобто є наслідком зіткнення асимптотично стійких і нестійких станів руху Ключові слова: трубопровідний транспорт, сипучий матеріал, перемежуваємість, режи-ми руху, водовугільне паливо, енергозбереження Выполнено исследование явлений, проис-ходящих в транспортном трубопроводе при перемещении смесей в нестационарных режи-мах массопереноса. Предложена реологическая модель движения неньютоновских жидкостей. Показано, что стохастические режимы движе-ния смесей возникают при переходе через пере-меживаемость, то есть являются следствием столкновения асимптотически устойчивых и неустойчивых состояний движения Ключевые слова: трубопроводный транс-порт, сыпучий материал, перемеживаемость, режимы движения, водоугольное топливо, энергосбережение UDC 622.278

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Rheological properties of water-coal slurries based on brown coal in the presence of sodium lignosulfonates and alkali

Cited by 6 publications

References 3 publications

The Main Regularities of Ignition and Combustion of Coal-Water Fuels Produced from Brown, Flame and Gas Coals

The Main Regularities of Ignition and Combustion of Coal-Water Fuels Produced from Brown, Flame and Gas Coals

Review and Perspectives of Anionic Dispersants for Coal–Water Slurry

Improving industrial pipeline transport using research of regularities of flow of mixtures in material pipeline

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