Combustion apparatus

F - Mech Eng,Light,Heat,Weapons – 23 – D

Patent

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Details

F23D 1/00 (2006.01) F23D 17/00 (2006.01)

Patent

CA 2064868

A combustion apparatus comprises a mixture feeding pipe through which a mixture of pulverized coal and combustion air flows. The mixture is injected into a furnace through the mixture feeding pipe and then ignited. A radial outwardly flared flame maintaining ring is provided at the tip end of the mixture feeding pipe. The flame maintaining ring is under a reduction atmosphere and exposed to high temperatures due to radiant heat from the furnace. Therefore, there is a possibility of burnout of the flame maintaining ring or growth of slag on the flame maintaining ring. In order to prevent this, a projection is disposed to extend into the furnace beyond the flame maintaining ring so as to shut off radiation from the inside of the furnace to the flame maintaining ring adequately, thereby suppressing an excessive temperature rise. Combustion air flows along the surface of the projection so as to locate the projection under an oxidation atmosphere. A pulverized coal/air separating member extends through within the mixture feeding pipe. A portion where separation of the flow is forcibly occurred is formed locally in a conical end portion of the pulverized coal/air separating member. It is therefore possible to effect a combustion in a stabilized manner as a whole regardless of the unit capacity and load of the combustion apparatus.

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