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Formation of Dust Particles in Process Multiphase Reactors

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Abstract

Issues of the formation of dust particles in high-temperature technological reactors are considered with an emphasis on the processes occurring in electrothermal ore-reduction furnaces of phosphorus production, when dust serves as a source of sludge that contaminates the product. A model of dust formation is proposed based on the hydrodynamic interaction of gas bubbles with liquid when they exit at the interface, when the destruction of bubbles leads to the appearance of drops carried away by the gas flow. Consideration of the stability positions for maximum perturbations in cylindrical liquid jets makes it possible to estimate the droplet sizes above the liquid surface and obtain qualitative and quantitative estimates for droplets carried away by the gas flow. Analytical dependencies for dust formation in a phosphoric furnace make it possible to relate the dust content to the operating parameters characterizing the operation of the furnaces (the temperature in the reaction zone) and the properties of the melt and control parameters (the voltage on the electrodes and the dosage of coke). Calculations based on the ratios show a satisfactory correlation with experimental data on the formation of dust in phosphoric, open-hearth furnaces, as well as bubbling heat and mass transfer installations. A model of thermophysical processes in an electrothermal reduction reactor is presented in the approximation of lumped-distributed parameters, which takes into account the interaction of zones of different phase compositions, making it possible to analyze the operating modes of the reactor from the main control parameters—voltage on the electrodes and the proportion of reducing coke. The results can be used to optimize the operating modes of the equipment within the limits of permissible dust emissions.

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Funding

This research was carried out with financial support from the Russian Foundation for Basic Research as part of scientific project no. 18-29-24094 and the Ministry of Science and Higher Education of the Russian Federation as part of State Task no. FSWF-2020-0019.

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Authors and Affiliations

  1. Mendeleev University of Chemical Technology of Russia, Moscow, Russia

    V. P. Meshalkin

  2. National Research University Moscow Power Engineering Institute, Smolensk, Russia

    S. V. Panchenko & M.I. Dli

  3. National Research University Moscow Power Engineering Institute, Moscow, Russia

    E. I. Lobaneva

Authors
  1. V. P. Meshalkin
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  2. S. V. Panchenko
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  3. M.I. Dli
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  4. E. I. Lobaneva
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Correspondence to E. I. Lobaneva.

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Special Issue Dedicated to the Jubilee of Academician of the RAS Valery P. Meshalkin.

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Meshalkin, V.P., Panchenko, S.V., Dli, M. et al. Formation of Dust Particles in Process Multiphase Reactors. Theor Found Chem Eng 55, 628–637 (2021). https://doi.org/10.1134/S0040579521040291

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  • DOI: https://doi.org/10.1134/S0040579521040291

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