Coal combustion

Details Coal combustion Coal combustion

F - Mech Eng,Light,Heat,Weapons

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F23L 15/00 (2006.01) F23C 7/06 (2006.01) F23D 1/02 (2006.01) F23K 1/04 (2006.01) F23K 3/02 (2006.01) F23M 5/08 (2006.01)

Patent

CA 1111315

Abstract of the Disclosure For the combustion of finely-ground coal which is slow to ignite, the coal is preheated before it enters the combustion chamber. The preheating can be carried out by passing cold air around the outside of the combustion chamber and then using this heated air to preheat the coal in bunkers. For this purpose the combustion chamber is provided with a hollow casing surround- ing the combustion chamber proper and a partition in the hollow casing pro- vides an annular outer space and a concentric annular inner space. A helical baffle arrangement is also provided in the inner and outer spaces to guide the cold air down the outer space and up the inner space. The coal is burned below the melting point of the coal slag and this produces a soft ash rather than molten material. The ash is cleaner and cannot bake onto burner housing. Heat is stored in the combustion chamber wall and the time of residence of the coal in the combustion chamber is increased by impart- ing a spiral motion to the coal and/or air supplied to the combustion chamber. The layer residence ensures more complete combustion.

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