The influence of the coal dust composition on the propagation speed of the combustion front of the coal dust with an inhomogeneous particle distribution in the air
| Autor: | Alexey Yurjevich Krainov, Kseniya Mikhailovna Moiseeva |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
distillation
Distribution (number theory) burning velocity Mineralogy aerosol of coal dust Coal dust complex mixtures 01 natural sciences 010305 fluids & plasmas 0103 physical sciences Physics::Chemical Physics 0101 mathematics Physics::Atmospheric and Oceanic Physics Combustion front lcsh:T57-57.97 lcsh:Mathematics lcsh:QA1-939 respiratory tract diseases Computer Science Applications 010101 applied mathematics Computational Theory and Mathematics Modeling and Simulation lcsh:Applied mathematics. Quantitative methods Environmental science Particle Composition (visual arts) combustion |
| Zdroj: | Компьютерные исследования и моделирование, Vol 10, Iss 2, Pp 221-230 (2018) |
| ISSN: | 2077-6853 2076-7633 |
| DOI: | 10.20537/2076-7633-2018-10-2-221-230 |
| Popis: | The problem of the combustion of a gas suspension with an inhomogeneous distribution of particles over space occurs exists for the coal dust suspension combustion in combustion chambers and burners. The inhomogeneous distribution of particles in space can significantly affect the combustion velocity of the aerosolve of coal dust. The purpose of the present work is the numerically study the effect of the inhomogeneous distribution of particles and the composition of the coal dust on the combustion velocity of the coal dust in the air. The physical and mathematical model of combustion of air-coal dust mixture with an inhomogeneous distribution of coal dust particles over space has been developed. The physical and mathematical formulation of the problem took into account the release of combustible volatile components from the particles upon their heating, the subsequent reaction of volatile components with air, a heterogeneous reaction on the surface of the particles, and the dependence of the thermal conductivity of the gas on temperature. A parametric study was made of the effect of mass concentration, the content of volatile and the particle size of coal dust on the burning speed of a suspension of coal dust in the air. It is shown that the burning rate is greater for particles with a lower content of volatile components. The influence of the spatial distribution of particles on the burning rate of the coal-air mixture is analyzed. It is shown that the propagation velocity of the combustion front with respect to the suspension with an inhomogeneous particle distribution is higher than the propagation speed of the combustion front with respect to the suspension with a homogeneous particle distribution. |
| Databáze: | OpenAIRE |
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