Combustion chamber with two-stage combustion
AssigneeAsea Brown Boveri AG
InventorsRolf Althaus, Jakob J. Keller
Life of this patent
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Abstract
A combustion chamber with two-stage combustion has primary burners (110) of the premixing type of construction, in which the fuel injected via nozzles (117) is intensively mixed with the combustion air inside a premixing space (130) prior to ignition. The primary burners are of flame-stabilizing design, i.e. they are designed without a mechanical flame retention baffle. They are provided with tangential inflow of the combustion air into the premixing space (130). Arranged downstream of a precombustion chamber (61) are secondary burners (150) which are designed as premixing burners which do not operate by themselves.
Claims7
A combustion chamber with two-stage combustion, comprising:
- a wall defining a precombustion space and a main combustion space,
- at least one primary premixing burner mounted at a head of the precombustion space, the at least one primary premixing burner having two hollow bodies defining an interior premixing space, with center axes of the bodies being offset so that adjacent edges of the bodies define longitudinally extending inlet gaps on opposite sides of the interior premixing space for a tangentially directed flow of combustion air into the interior premixing space,
- means for introducing combustion air through the inlet gaps into the premixing space,
- fuel nozzles to inject fuel into the premixing space to mix with the combustion air inside the premixing space, wherein a premixture of fuel and air is produced at a burner outlet,
- means for igniting the premixture at the burner outlet, and
- at least one secondary premixing burner mounted on the wall downstream of the precombustion space, the at least one secondary burner having a premixing space to produce a secondary fuel and air mixture into the combustion chamber for auto-ignition of the secondary mixture.
Dependencies are inferred from the claim text.