Abstract
Two staged combustion tests of coal-water mixture (CWM) fuel were conducted under relatively high-intensity conditions. The influences of spray and air flow on flame stability were tested using a newly designed slit-type atomizer for various air flow conditions, and NOx reduction effects were investigated. Main results are as follows. (1) Suitable combination of strong primary air swirl with hollow-cone shaped fine spray assures stable ignition and flame stability even under the low primary air ratios, because hot recirculating gas surrounding the spray effectively promotes the volatilization of CWM fuel, (2) The primary combustion of high intensity assures high combustion efficiency and low NOx emission, because a wide and hot deoxidation zone can be maintained between the primary and secondary combustion zones.
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