Abstract:
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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