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    • 5. 发明专利
    • FINELY POWDERED COAL BURNING DEVICE
    • JPS60126508A
    • 1985-07-06
    • JP23477483
    • 1983-12-13
    • BABCOCK HITACHI KK
    • MORITA SHIGEKIMASAI TADAHISAUEMURA TOSHIONAKASHITA SHIGETOKOUDA FUMIO
    • F23D1/04F23D1/00
    • PURPOSE:To avoid the increasing of unburnt content in a ash and reduce the NOx by a method wherein a finely powdered coal flow is formed arround an air flow, a flame holding member having a specific shape is provided at the top position where the both fluids are supplied. CONSTITUTION:An oxygen-containing gas supply pipe 30 and a cylindrical sleeve 20 are provided, and a finely powdered coal flow 21 is flowed along the outer side of the pipe 30. The pipe 30 and the sleeve 20 are arranged on the axis 104 of a burner throat 10. A flame holding member 50 formed to be smaller difference in diameter than that of the air supply pipe 30 is provided at the furnace side opening end of the air supply pipe 30. By the bluff-body effect due to the flame holding member 50, a finely powdered coal turbid flow (circulating flow) is generated where the finely powdered coal is ignited and the flame holding function is performed. Meanwhile, a generated gas content such as a carbon hydride gas and the like are partially ignited, thermally decomposed and oxidized by the air flow I , and changed to a mixed gas IIIhaving a high reactivity, then a high temperature reducing atmosphere is formed. The atmosphere is diffused with surrounding an exhaust gas 41, then gradually mixed with an oxidate such as a high temperature small quantity remaining oxygen and OH radical and the like, thus, a zone IV is formed. Further, the zone IV is contacted with a main burner burning gas, and mixed, then a NO contained in the burning gas is reduced to N2.