| 摘要 |
PROBLEM TO BE SOLVED: To provide a solid fuel burner provided with a means for preventing slacking due to the combustion ash by promoting ignition of the fuel in a burner utilizing the low-concentration combustion exhaust gas as a carrier gas for a low-grade solid fuel such as brown coal, and to provide a burning method thereof. SOLUTION: An additional air nozzle 12 and a separator 35 for separating a flow passage are provided in a fuel nozzle 11, and an outlet of the additional air nozzle 12 is arranged at a position overlapped with the separator 35 with a view in a direction vertical to the burner axis. Additional air is injected in a direction nearly vertical to the fuel injection flowing in the fuel nozzle 11 to promote mixing of the fuel and the air inside of the fuel nozzle 11. Quantity of the air from the additional air nozzle 12 is changed in response to a combustion load. In the case of a low load, quantity of the air from the additional air nozzle 12 is increased to raise the oxygen concentration of a circulation flow 19 formed in a downstream outside of the outlet of the fuel nozzle 11 for stabilized combustion. In the case of a high load, quantity of the air from the additional air nozzle 12 is reduced to form a flame at a position separated from the fuel nozzle 11 to restrict the radiation heat to be applied to the solid fuel burner structure and a furnace wall. COPYRIGHT: (C)2003,JPO
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