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Mathematical modeling of the thermochemical processes of sequestration of SOx when burning the particles of the coal and wood mixture

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  • Syrodoy, S.V.
  • Kuznetsov, G.V.
  • Gutareva, N. Yu
  • Nigay (Ivanova), N.A.

Abstract

The article presents the results of mathematical modeling of the initial stage of the combustion of wood and coal particles in conditions corresponding to the combustion chambers of boiler units of thermal power plants. A hypothesis is formulated that describes the sequestration of anthropogenic sulfur oxides (SOx) under the conditions of combustion of mixed fuels based on coal and wood as a result of the interaction of water vapors (formed during the evaporation of interporeal and adsorbed biomass moisture) with SOx with the formation of sulfuric (H2SO4) acid vapors. When these vapors of sulfuric acid H2SO4 interact with iron oxides of the mineral part of the coal. To test the formulated hypothesis, a new mathematical model has been developed for the processes of co-ignition and combustion of wood and coal particles under high-temperature heating conditions. The mathematical model of the ignition process developed by the authors differs from the known ones (published in leading international scientific periodicals on the combustion of solid fuels) by a detailed description of a complex of gas-phase and heterogeneous thermochemical reactions occurring both in the boundary layer of fuel particles and in their porous structure. The mathematical model of the combustion process of wood-coal fuel particles developed by the authors is currently the most detailed in describing the thermophysical, thermochemical and aeromechanical processes occurring both in the fuel particles and in their small vicinity. Multistage kinetic schemes for the oxidation of the main volatile components (methane ‒ CH4, carbon monoxide ‒ CO, hydrogen ‒ H2), as well as the formation of sulfur oxides by means of oxidation of hydrogen sulphide (H2S), released as a result of pyrolysis of the organic part of coal, have been adopted. Based on the results of numerical modeling, the possibility of intensifying the processes of sequestration of sulfur oxides by moistening the wood component of the fuel mixture has been established. It is shown that water vapor can act as an agent adsorbing anthropogenic sulfur oxides, transforming the latter into sulfuric acid vapor, respectively. In turn, the vapors H2SO4 and HNO- 3 can be relatively easily captured by means of condensation. It has been established that for effective SOx capture during co-combustion of coal and biomass, the moisture content of the latter must be at least 5% by weight. The research provides grounds for the conclusion about the possibility of environmentally efficient combustion of coal in the composition of wood-coal fuel composites.

Suggested Citation

  • Syrodoy, S.V. & Kuznetsov, G.V. & Gutareva, N. Yu & Nigay (Ivanova), N.A., 2022. "Mathematical modeling of the thermochemical processes of sequestration of SOx when burning the particles of the coal and wood mixture," Renewable Energy, Elsevier, vol. 185(C), pages 1392-1409.
    • Handle: RePEc:eee:renene:v:185:y:2022:i:c:p:1392-1409
    DOI: 10.1016/j.renene.2021.10.091
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    1. Syrodoy, S.V. & Kuznetsov, G.V. & Nigay, N.A. & Purin, M.V. & Kostoreva, Zh.A., 2023. "The effect of compaction of the dispersed wood biomass layer on its drying efficiency," Renewable Energy, Elsevier, vol. 211(C), pages 64-75.

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