Combustion of the coal-methane-air mixture in the heat recovery burner

In this article, the research of the combustion of methane-air mixture with coal dust particles in the heat recovery burner is performed. The burner consists of two parallel plates with a thin internal partition (U-shaped burner). The mixture which flows into the inlet is warmed up via the thin internal partition by heat reaction products from the outlet. The mathematical statement of the problem includes the equations of energy conversation for gas, coal particles, and internal partition, mass balance equations of methane, oxygen and coal particles, continuity equation, particle number concentration equation, particle size equation, and gas equation. The numerical simulation is carried out using an implicit difference scheme with a four-point template. The coal dust particle size and the gas flow rate at the inlet varied for each calculation. The stability boundary of the coal-methane-air mixture combustion is determined as a function of the inlet rate of gas depending on coal-dust particle size. The obtained results demonstrate that the heat recovery and coal dust particles burning can support the combustion of full lean methane-air mixtures.

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