Abstract: A method, control unit and rotating machine for determining a fuel split setting value for adjusting a fuel split setting for a combustion device, the fuel split setting defining a relation between main fuel and pilot fuel. The method includes: retrieving a first information item correlated to heating value of supplied main fuel; retrieving a second information item correlated to combustor operating condition; retrieving at least one third information item representing stability of combustion; selecting a predefined pair of minimum and maximum boundary curves for the fuel split setting from a plurality of predefined pairs based on the first and second information items, the minimum and maximum boundary curves defining a band of fuel split settings permitted for a range of second information item values; determining the fuel split setting value within the selected pair of minimum and maximum boundary curves based on the third information item.

Abstract: A method, control unit and rotating machine for determining a fuel split setting value for adjusting a fuel split setting for a combustion device, the fuel split setting defining a relation between main fuel and pilot fuel. The method includes: retrieving a first information item correlated to heating value of supplied main fuel; retrieving a second information item correlated to combustor operating condition; retrieving at least one third information item representing stability of combustion; selecting a predefined pair of minimum and maximum boundary curves for the fuel split setting from a plurality of predefined pairs based on the first and second information items, the minimum and maximum boundary curves defining a band of fuel split settings permitted for a range of second information item values; determining the fuel split setting value within the selected pair of minimum and maximum boundary curves based on the third information item.

Abstract: A fuel injection duct for a combustion apparatus is provided. The fuel injection duct includes an inlet opening, an outlet opening, and an inner surface, wherein the inner surface exhibits a surface structure imparting a swirl to fuel moving from the inlet opening to the outlet opening, the fuel interacting with the surface structure of the inner surface. The manufacture of the fuel injection duct is easy and cost-effective and imparts a swirl to fuel flowing through the fuel injection duct.

Abstract: A combustion apparatus includes a combustion chamber, a pre-chamber and a first device for mixing a fuel with an oxidant, the first device being located upstream of the pre-chamber. The combustion chamber and the pre-chamber share a common first and second wall spaced to each other building a cavity. The first wall exhibits at least one first opening in the area of the combustion chamber for introducing a coolant into the cavity. Further, the combustion apparatus has a channel for feeding the oxidant to the first device, whereby the channel is formed by a housing element of the combustion apparatus and the common first wall of the combustion chamber and the pre-chamber. The at least one first opening is located in the area of the combustion chamber. The first wall exhibits at least one second opening, located in the area of the pre-chamber, for introducing the coolant into the cavity.

Abstract: A fuel injection duct for a combustion apparatus is provided. The fuel injection duct includes an inlet opening, an outlet opening, and an inner surface, wherein the inner surface exhibits a surface structure imparting a swirl to fuel moving from the inlet opening to the outlet opening, the fuel interacting with the surface structure of the inner surface. The manufacture of the fuel injection duct is easy and cost-effective and imparts a swirl to fuel flowing through the fuel injection duct.

Abstract: A combustion apparatus includes a first device for mixing a fuel with an oxidant, a combustion chamber in which combustion of the fuel/oxidant mix takes place, a pre-chamber located between the first device and the combustion chamber and a second device for outputting a gas flow into the pre-chamber. The first device is adapted for outputting the oxidant or the fuel or the fuel/oxidant mix to the pre-chamber. The second device is located upstream of the first device and wherein the second device is arranged for mixing fuel with a gas and the gas flow is a fuel/gas mix.

Abstract: A swirler vane for providing fuel, particularly liquid fuel, to a swirling zone of a burner assembly is provided. The swirler vane includes at least one injection hole for injecting the fuel to the swirling zone of the burner and an injection feed hole passage connecting the at least one injection hole with a main fuel feed. The swirler vane or a tip of the swirler vane, where the at least one injection hole is arranged, is manufactured by laser deposition or includes at least a surface manufactured by laser deposition. A swirler including a plurality of such swirler vanes and a burner assembly including the swirler with such swirler vanes are also provided.

Abstract: A combustion apparatus comprising: a device for mixing a fuel with an oxidant; a combustion chamber in which combustion of the fuel/oxidant mix takes place; a pre-chamber located between the device and the combustion chamber; and means for supplying a gas to the pre-chamber so as to form a film of gas on the interior surface of the pre-chamber so as to prevent a combustion flame from the combustion chamber attaching itself to this interior surface damaging the pre-chamber, the supply of gas to the pre-chamber being such that where the gas first reaches the interior surface of the pre-chamber it forms a substantially continuous film of gas over this interior surface.