Method of igniting a pulverized coal annular burner flame

Details Method of igniting a pulverized coal annular burner flame Method of igniting a pulverized coal annular burner flame

F - Mech Eng,Light,Heat,Weapons

23

K

110/18

F23K 3/00 (2006.01) F23D 1/00 (2006.01)

Patent

CA 1160105

ABSTRACT OF THE DISCLOSURE A method is provided herein for the ignition of a coal dust annular burner flame having an internal back flow region. The ignition energy is supplied at least partially by a dust-ignition flame and is introduced centrally into the internal back flow region of the coal dust annular burner flame. The ignition burner flame is operated with a fuel dust which differs from the main fuel in at least one of the properties of granular size and consistency. The dust air-dust weight ratio for the dust-ignition flame is smaller (0.5 to 1.0) than that of the main burner flame (1.5 to 2.0). The dust ignition flame is operated at a smaller air number (.lambda. =0.8 to 1.1) than the main burner flame (.lambda. =1.1 to 1.3) thus providing the main burner with a core-air passage. The com- bustion air is supplied to the ignition burner flame by means of that core-air passage.

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