Dispersion and flow properties of charcoal oil slurries (ChOS) as potential renewable industrial liquid fuels

Loureiro, Liliana R.; Gil, P.B.F.; Campos, F.V. Vieira de; Nunes, Leonel J. R.; Ferreira, J.M.F.

doi:10.1016/j.joei.2017.08.001

Cited by 26 publications

(4 citation statements)

References 38 publications

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“…This is primarily explained by the high viscosity of coal-water fuel. For example, it is noted in [12] that the recommended value of the dynamic viscosity of coal-water fuel for spraying is 1000-1200 mPa•s at a viscometer spindle shear rate of 100 s −1 . This is a fairly high value, in comparison with the viscosity of heated fuel oil-20-50 mPa•s.…”

Section: Problems With the Combustion Of Cwfmentioning

confidence: 99%

Nozzles for Spraying Coal–Water Fuels

Gvozdyakov,

Zenkov

2023

Applied Sciences

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This work presents a review of modern devices for spraying coal–water fuels. The efficiency of their operation was analyzed according to several criteria: the simplicity of their design (A), the fuel channel’s predisposition to clogging (B), durability in terms of the erosive wear of the nozzle channel (C), and dispersion of the jet—the average size of droplets in the jet (D). It was established that, from the point of view of operational efficiency, the most preferred devices for spraying coal–water fuels are those with a quasi-internal mixing of fuel and spraying agents. In combination with refractory or ceramic materials and the large diameter of the fuel channel, its rapid erosion wear and the likelihood of clogging with large particles of coal or agglomerates of viscous coal–water fuel are excluded. At the same time, the possibility of forming a fine-dispersed jet remains. The cooling of the nozzle with an external mixing of fuel and spraying agents during its operation also reduces the rate of erosion wear. Narrowing the fuel channel was proven to be an undesirable solution when creating a coal–water fuel nozzle. This review will be useful for both researchers studying the processes of spraying coal–water fuels and designers involved in the creation of coal–water fuel injectors or the transfer of existing boilers to coal–water fuel.

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Section: Problems With the Combustion Of Cwfmentioning

confidence: 99%

Nozzles for Spraying Coal–Water Fuels

Gvozdyakov,

Zenkov

2023

Applied Sciences

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“…От изменения плотности или вязкости, как правило, зависит размер капель после распыления, их количество, дальнобойность струи и т.д. Например, авторами [27] установлено, что эффективное распыление суспензий возможно при значениях вязкости не более 1,2 Па•с при скорости сдвига шпинделя вискозиметра 100 с -1 . Также известно, что жидкости с низкими значениями вязкости лучше подвержены диспергированию в среде воздуха (или окислителя в условиях высоких температур).…”

Section: результаты и обсуждениеunclassified

Quasi-hot spraying of coal-water slurries with pyrogenetic water additives

Gvozdyakov

Zenkov

Лавриненко

et al. 2022

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

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The relevance of the work is explained by the absence of the results of the heating effect of multicomponent coal-water slurries on rheological properties and characteristics of spraying in the literature.PURPOSE. Efficiency substantiation of thermal preparation of coal-water slurries based on pyrogenetic liquid by the results of experimental studies.METHODS. When solving this problem, the Brookfield RVDV-II+Pro rotary viscometer, general-purpose hydrometers, and the Interferometric Particle Imaging method were used.RESULTS. It was found that when water in coal-water fuel is replaced by a similar amount of pyrogenetic liquid (no more than 25%), the density of the slurry increases by 14% at a temperature of 293 K. Preheating of coal-water slurries to 363 K reduces the increase in the density value to 7%. The experimental results showed that the greatest influence of the thermal preparation of the studied slurries on their dynamic viscosity is characteristic of the temperature range from 293 to 333 K. At such temperatures, a decrease in the viscosity of the fuel is possible by 17-20%. Preheating of slurries before spraying in the temperature range from 293 to 333 K makes it possible to increase jet spraying angle by 21-29% in comparison with two-component coal-water fuel at a temperature of 293 K. Substitution of more than 25% by weight of water with pyrogenetic liquid in coal-water fuel is impractical for the studied grade of coal from the point of view of a significant increase in viscosity. Preheating coal-water fuel before spraying reduces the average droplet size by 5-9%.CONCLUSION. The efficiency of thermal preparation of coal-water slurries based on pyrogenetic liquid by the results of experimental studies of rheological properties and spraying characteristics was substantiated.

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“…This convenience is certainly an important consideration in its application to industrial-scale use in the maritime industry [74]. Examples of solid suspensions are sand [75,76], charcoal [77,78], wood pulp [79,80], nylon [81,82], asbestos [83,84], and other suspensions [24].…”

Section: Solid-particle Suspensionsmentioning

confidence: 99%

Drag Reduction Using Additives in Smooth Circular Pipes Based on Experimental Approach

et al. 2021

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Reduction of fluid resistance using the rheological characteristics of a polymer-surfactant solvent is research that contains many aspects, such as the theory of the drag reduction process, historical journey, and ongoing current research development. Many studies have been conducted, but it is challenging to know all existing and new research threads. The present investigation was conducted using literature studies regarding drag reducing agents. This research will also discuss the characteristics of flowing fluids and their effects on the velocity profile with friction factor of flowing fluids in smooth circular straight pipe geometries based on experimental, theoretical approaches. It concludes with aspects of research conducted around reducing drag using drag reducing agents, ideas about innovations, structuring overlook in testing, and modification of the fluid flow state.

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Dispersion and flow properties of charcoal oil slurries (ChOS) as potential renewable industrial liquid fuels

Cited by 26 publications

References 38 publications

Nozzles for Spraying Coal–Water Fuels

Nozzles for Spraying Coal–Water Fuels

Quasi-hot spraying of coal-water slurries with pyrogenetic water additives

Drag Reduction Using Additives in Smooth Circular Pipes Based on Experimental Approach

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