SOLID FUEL BURNER Russian patent published in 2009 - IPC F23D1/00 

FIELD: heating.

SUBSTANCE: invention relates to power industry. The solid fuel burner contains the first oxidiser duct having the first longitudinal axle, the first oxidiser inlet port and the first oxidiser outlet port positioned at a distance from the first oxidiser inlet port; the first oxidiser duct is designed to enable first flow transfer of the first oxidiser flux admitted through the first oxidiser inlet port and discharged through the first oxidiser outlet port; the oxidiser oxygen concentration exceeds 21 vol. %; the solid fuel duct having the second longitudinal axle basically parallel to the first longitudinal axle, an inlet port and an outlet port positioned at a distance from the inlet port; the solid fuel duct encases the first oxidiser duct to form the first annular space between the solid fuel duct and the first oxidiser duct; the first annular space is designed to enable transfer of a mixture composed of transport gas and multiple solid fuel particles admitted through the inlet port and discharged through the outlet port; the second oxidiser duct having the third longitudinal axle basically parallel to the second longitudinal axle, the second oxidiser inlet port and the second oxidiser outlet port positioned at a distance from the second oxidiser inlet port; the second oxidiser duct encases the solid fuel duct to form the second annular space between the solid fuel duct and the second oxidiser duct; the second annular space is designed to enable second flow transfer of the second oxidiser flux or that any other oxidiser with an oxygen concentration over 21 vol. % with the said second flux admitted through the second oxidiser inlet port and discharged through the second oxidiser outlet port; and a splitter element. The latter performs outlet separation of the mixture flux into the mixture thin fraction flux related to the first oxidiser duct and the mixture thick fraction flux related to the solid fuel duct. The thick fraction flux has the first transport gas/solid fuel mass ratio and the thin fraction flux has the second transport gas/solid fuel mass ratio. The second mass ratio exceeds the first mass ratio. With the burner proposed at least part of the first oxidiser flux discharged from the first oxidiser outlet port becomes combined, when burnt, with at least part of the thin fraction flux to produce an inner outlet-related combustion zone; at least part of the second oxidiser flux discharged from the second oxidiser outlet port becomes combined, when burnt, with at least part of the thick fraction flux to produce an outer combustion zone in immediate proximity to the inner combustion zone.

EFFECT: improved flame stability and enhanced burner operational efficiency.

24 cl, 14 dwg