Secondary destruction of organic coal-water slurry drops at different temperatures in a gas flow

Anna A. Shebeleva ; Alexander V. Shebelev ; Andrey V. Minakov ; Anastasia K. Okrugina

Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 17 (2024) no. 5, pp. 654-664.

Résumé

A computational study of the secondary destruction of a drop of organic water-coal fuel (OCWS) in a gas flow was carried out. For the first time, the influence of the temperature of an OCWF drop, which has non-Newtonian properties, on deformation and its further destruction was studied. The computational study was carried out using a numerical technique based on the VOF method, the LES model was used to take into account turbulence, and the technology of adapted dynamic meshes was used to describe the behavior of the interface on the main turbulent scales, which made it possible to resolve secondary liquid droplets up to 20 ${\mu}$m in size. During the work, the shape of the surface of an OCWF drop during the destruction process, as well as the structure of the flow near and in the wake of the drop, were studied. As a result of the calculations, the dependences of the rate of transverse deformation of the midsection of an OCWF drop for different temperatures were obtained. Judging by the results, with increasing temperature, the destruction time of an OCWF drop decreases, which has a beneficial effect on the mixing of OCWF with air.

Détail

Keywords: OCWS fuel, secondary destruction of a drop, deformation rate, mathematical modeling, dynamic mesh adaptation technology.

Bibliographie

[1] A.Kijo-Kleczkowska, “Combustion of coal-water suspensions”, Fuel, 90 (2011), 865–877 | DOI

[2] BP Statistical Review of World Energy, 90, BP, London, 2015, 48 pp.

[3] G.S.Khodakov, E.G.Gorlov, “Suspension coal fuel”, Chemistry of solid fuel, 6 (2005), 15–32 (in Russian)

[4] V.I.Murko, V.I.Fedyaev, et al., “Investigation of the spraying mechanism and combustion of the suspended coal fuel”, Thermal Science, 19 (2015), 243–251 | DOI

[5] A.P.Burdukov, A.A.Emel'yanov, V.I.Popov, S.N.Tarasenko, “An investigation of the rheology and dynamics of combustion of composite coal-water slurries”, Thermal Engineering, 44 (1997), 492–497

[6] Z.Gao, S.Zhu, M.Zheng, Z.Wu, H.Lu, W.Liu, “Effects of fractal surface on rheological behavior and combustion kinetics of modified brown coal water slurries”, International Journal of Coal. Science and Technology, 2 (2015), 211–222 | DOI

[7] S.M.Tavangar, H.Hashemabadi, A.Saberimoghadam, “CFD simulation for secondary breakup of coal-water slurry drops using OpenFOAM”, Fuel Processing Technology, 132 (2015), 153–163 | DOI

[8] S.C. Yao, “Burning of suspended coal-water slurry droplet with oil as combustion additive”, Combustion and Flame, 66 (1986), 87–89 | DOI

[9] N.I.Fedorova, Yu.F.Patrakov, V.G.Surkov, A.K.Golovko, “Analysis of the combustion character of composite fuels obtained by the cavitation method”, Bulletin of the Kuzbass State Technical University, 4 (2007), 38–41 (in Russian)

[10] K.Svoboda, et al., Fluidized bed gasification of coal–oil and coal–water–oil slurries by oxygen–steam and oxygen–CO2 mixtures, Fuel Processing Technology, 95 (2012), 16–26 | DOI

[11] M.Kurmangaliev, V.Nekrasov, “Breakup of water-coal slurry drops in air flows”, Fluid Mech. Sov. Res., 4 (1975)

[12] T.Yu, et al., Secondary atomization of coal water fuels for gas turbine applications, MIT Energy Lab Report.No 88, 1988

[13] H.Zhao, et al., Secondary breakup of coal water slurry drops, Phys. Fluids, 23 (2011), 113101–113101 | DOI

[14] H.Zhao, et al., Breakup and atomization of a round coal water slurry jet by an annular air jet, Chemical Engineering Science, 78 (2012), 63–74 | DOI

[15] H.Zhao, et al., Influence of rheological properties on air-blast atomization of coal water slurry, J. Non-Newtonian Fluid Mech., 211 (2014), 1–15 | DOI

[16] A.A.Shebeleva, A.V.Minakov, M.Yu.Chernetskii, P.A.Strizhack, Deformation of a droplet of an organic water–coal fuel in a gas flow, J. Appl. Mech. Tech. Phys., 59:4 (2018), 653–661 | DOI

[17] A.V.Minakov, A.A.Shebeleva, M.Y.Chernetskiy, P.A.Strizhak, R.S.Volkov, “Study of the weber number impact on secondary breakup of droplets of coal water slurries containing petrochemicals”, Fuel, 254 (2019), 115606–115606 | DOI

[18] C.W.Hirt, B.D.Nichols, “Volume of fluid (VOF) method for the dynamics of free boundaries”, Journal of computational physics, 39 (1981), 201–226 | DOI

[19] J.U.Brackbill, D.B.Kothe, C.A.Zemach, “Continuum method for modelling surface tension”, J. Comput. Phys., 100 (1992), 335–354 | DOI | MR | Zbl

[20] J.Smagorinsky, “General Circulation Experiments with the Primitive Equations I. The Basic Experiment”, Month. Wea. Rev., 91 (1963), 99–164 | 2.3.CO;2 class='badge bg-secondary rounded-pill ref-badge extid-badge'>DOI

[21] G.Lei, L.Junguo, “Study on the Influence of Pulping Process on Rheological Properties of Coal Water Slurry”, IOP Conf. Series: Earth and Environmental Science, 384 (2019), 1–7 | DOI

[22] S.V.Bukhman, “Experimental study of droplet disintegration”, Bulletin of the Academy of Sciences of the Kazakh SSR, 1 (1954), 38–43 (in Russian)