Furnaces – Process – Burning pulverized fuel
Reexamination Certificate
2007-01-30
2007-01-30
Rinehart, Kenneth (Department: 3749)
Furnaces
Process
Burning pulverized fuel
C110S265000
Reexamination Certificate
active
11011047
ABSTRACT:
A solid fuel burner using a low oxygen concentration gas as a transporting gas of a low grade solid fuel such as brown coal or the like and a combustion method using the solid fuel burner are provided. The solid fuel burner comprises a means for accelerating ignition of the fuel and a means for preventing slugging caused by combustion ash from occurring. Mixing of fuel and air inside a fuel nozzle11is accelerated by that an additional air nozzle12and a separator35for separating a flow passage are arranged in the fuel nozzle11, and the exit of the additional air nozzle12is set at a position so as to overlap with the separator35when seeing from a direction perpendicular to a burner axis, and additional air is ejected in a direction nearly perpendicular to a flow direction of a fuel jet flowing through the fuel nozzle11. An amount of air from the additional air nozzle12is varied corresponding to a combustion load. By increasing the amount of air from the additional air nozzle12at a low load operation, an oxygen concentration of a circulation flow19formed in a downstream portion outside the exit of the fuel nozzle11is increased to stably burn the fuel. By decreasing the amount of air from the additional air nozzle12at a high load operation, a flame is formed at a position distant from the fuel nozzle11to suppress radiant heat received by structures of the solid fuel burner and walls of the furnace.
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Kuramashi Kouji
Okazaki Hirofumi
Takahashi Yoshitaka
Taniguchi Masayuki
Tsumura Toshikazu
Babcock-Hitachi K.K.
Crowell & Moring LLP
Hitachi , Ltd.
Rinehart Kenneth
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