Solid fuel burner, solid fuel burner combustion method,...

Details Solid fuel burner, solid fuel burner combustion method,... Solid fuel burner, solid fuel burner combustion method,...

2007-05-08

2007-05-08

Rinehart, Kenneth (Department: 3749)

Furnaces

Process

Burning pulverized fuel

C110S264000, C110S265000

Reexamination Certificate

active

10983901

ABSTRACT:
A solid fuel burner and its combustion method suited for encouraging fuel ignition and avoiding slugging caused by combustion ash, wherein a gas of low oxygen concentration (exhaust combustion gas) is used as a carrier gas of such a low grade solid fuel as brown coal.Means for Solving the SubjectAn additional air nozzle12for jetting additional air having a velocity component in the circumferential direction of a fuel nozzle11is provided in the fuel nozzle11, thereby encouraging mixing between the fuel and air in the fuel nozzle11. Further, the amount of air supplied from the additional air nozzle12is adjusted in response to the difference in combustion loads. Under light load, the amount of air supplied from the additional air nozzle12is increased so as to increase the oxygen concentration of the circulating flow19formed downstream of the outside of the outlet of the fuel nozzle11, whereby stable combustion is ensured. Under heavy load, by contrast, the amount of air supplied from the additional air nozzle12is decreased, and a flame is formed away from the fuel nozzle11in such a way that burner structures and furnace wall will be less subjected to radiant heat.

REFERENCES:
patent: 4688496 (1987-08-01), Schreter
patent: 4702180 (1987-10-01), Kiga
patent: 5199355 (1993-04-01), Larue
patent: 6237510 (2001-05-01), Tsumura et al.
patent: 2003-240227 (2003-08-01), None

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