โ Scribed by H.F. Zhao
No coin nor oath required. For personal study only.
This paper reports a new method of coal flame stabilization that uses multiple opposed jets. Such jets establish an excellent recireulation zone in the flowfield, different from that associated with swirl and bluffbodies. In the test chamber, air jets opposing the main flow issue from small holes distributed over multiple rings, located a certain distance from the main flow inlet. The results of cold flow experiments show the size of the recirculation region and the value of reverse velocity caused by the opposed jets to be much larger than those formed by a bluff body such as a disk. A new type of precombustor burner for coal using the multiple opposed jets has been successfully tested. The burner has excellent combustion characteristics and flexibility in the choice of coal. It works on the principle of a fuel-rich zone followed by a fuel-lean zone. Temperature distribution in the burner satisfies both the requirements of combustion stability and low NO~. Thus low NO x emission can be achieved. The construction of the burner is simple and easy for manufacturing. The small burner without a refractory wall may satisfy the requirements relating to retrofit of existing burners.
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