Characteristics of spraying and ignition of coal-water fuels based on lignite and liquid pyrolysis products of wood waste

D.V. Gvozdyakov, A.V. Zenkov and A. Zh Kaltaev

Energy, 2022, vol. 257, issue C

Abstract: In the modern realities of the energy market, the use of coal-water slurries with liquid industrial waste is a promising way to solve several problems (economic, environmental and energy). This article presents the results of experimental studies of the characteristics of spraying and ignition of promising coal-water slurries. Lignite, water and liquid pyrolysis products of wood waste were used as fuel components. It was found that substitution of 10% of coal with liquid pyrolysis products of wood waste decreases the dynamic viscosity of the fuel by 3.2 times in comparison with two-component coal-water fuel. Density for all the slurries studied (changes in the mass of the components: coal – from 40 to 50%; water – from 40 to 50%; pyrogenetic liquid – from 0 to 10%) differs by no more than 22%. Introduction of liquid pyrolysis products of wood waste into the coal-water fuel composition significantly changes the jet structure. Its characteristic parts – core, middle and peripheral zones – increase. The number of droplets with high velocities (30–40 m/s) increases significantly. The average size of fuel droplets in the jet decreases by 5–12% in comparison with two-component coal-water fuel. Ignition delay time of a single droplet of slurry at oxidizer temperature 1273 K increases by 23% in comparison with two-component coal-water fuel when 10% of coal is replaced by liquid pyrolysis products. In the case of water substitution with the same amount of the third component, the ignition delay time at an oxidizer temperature of 1273 K decreases by 26%. The most preferred of the studied coal-water fuels, from the point of view of application in the energy sector, are those in which water is replaced by the same amount of liquid pyrolysis products of wood waste.

Keywords: Lignite; Pyrogenetic liquid; Coal-water fuel; Spraying; Ignition (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:257:y:2022:i:c:s0360544222017169

DOI: 10.1016/j.energy.2022.124813

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