Patent ID: 8313324

Claim:
A combustion apparatus, comprising: a fuel supply line to the apparatus; a burner including a plurality of fuel-supply lines to the burner, the supply of fuel in the plurality of fuel-supply lines to the at least one burner corresponding to the supply of fuel in the fuel supply line to the apparatus; a combustion volume associated with the at least one burner; a temperature sensor located in the apparatus such as to be able to convey temperature information relating to a part of the apparatus to be protected against overheating; and a control arrangement arranged to vary, dependent on the temperature sensed by the temperature sensor, the fuel supplies to the burner to maintain the temperature of the part to be protected below a predetermined maximum limit, while keeping the fuel supply in the fuel supply line to the apparatus substantially constant, wherein the plurality of fuel-supply lines comprises first and second main fuel-supply lines to each of the burner to protect against overheating of a part of the apparatus and reduce the risk of low frequency dynamics in the apparatus, wherein a value of an amplitude of pressure variations within a combustion area of the apparatus, which tends to move the operating point of the apparatus toward a second undesired region of operation with low frequency dynamics in the apparatus is determined, and wherein when the determined value of the amplitude exceeds the second predetermined maximum limit the ratio is changed to reduce the value of the amplitude of pressure variations below the second predetermined maximum limit to reduce the low frequency dynamics.