Numerical Simulation Of Twin-Swirled Pre-Combustion Chamber Based On The Aerial Cleaning Combustion Conception

Most of the existing industrial furnace takes the oil as the fuel. As the increase of the price of oil, the equipment reform with the goal of substituting coal for oil become so popular. Because of the advantage of simple but compact structure,the strong fuel compatibility, the liquid Slag-removal Burner has been proposed. But the exciting Slag-removal Burner has the defects like low combustion efficiency, the serious shagging situation, the concentration of NOx is so high, etc.Under this background, Twin-Swirled Pre-Combustion Chamber Based on the aerial cleaning combustion conception is put forward. The conception of twin-swirl and regionalized combustion are used in designing of the pulverized coal burner of small-sized industrial furnace. Under the action of the two swirling air currents, the mix of the air and coal is enhanced. Resident time of the reactant in the Combustion chamber is extended,thus the combustion efficiency and burnout rate are both enhanced. The conception of regionalized combustion is manifests in that the Pre-Combustion Chamber is separated into ignition, and the content of NOx will also be reduced.At first the scheme of air intake is confirmed. And then through analysis of the one recirculation zone,velocity distribution and the particle trace, it can be proved the pre-combustion can produce ideal flow field. Furthermore, the influence to the flow field taking by the changing of blade angle,the diameter of the coal particle, flow ratio and total flow flux are analyzed .The results lay a foundation for hot simulation and provide some references to experiment that will be taken next step.