The present invention provides an apparatus and a method for operating a cyclone combustion furnace using gaseous fuel.

An object is to provide a decompression device including a plurality of stages of orifice plates disposed in a flow passage, which generates less noise in response to sonic feedback phenomenon and gas-column resonance. A decompression device 10A includes: an upstream orifice plate 14 disposed in a duct 12 forming a flow passage for a fluid F; and a downstream orifice plate 16 disposed in the flow passage and downstream of the upstream orifice plate 14. A jet-flow interference part 22A is disposed only partially on an outlet rim portion of an orifice 18 on the upstream orifice plate 14 and configured to interfere with a jet flow discharged from the orifice 18. Positions of Karman vortices e are differentiated in a duct axial direction between regions with and without the jet-flow interference part 22A to reduce generation of noise.

An object is to provide a decompression device including a plurality of stages of orifice plates disposed in a flow passage, which generates less noise in response to sonic feedback phenomenon and gas-column resonance. A decompression device 10A includes: an upstream orifice plate 14 disposed in a duct 12 forming a flow passage for a fluid F; and a downstream orifice plate 16 disposed in the flow passage and downstream of the upstream orifice plate 14. A jet-flow interference part 22A is disposed only partially on an outlet rim portion of an orifice 18 on the upstream orifice plate 14 and configured to interfere with a jet flow discharged from the orifice 18. Positions of Karman vortices e are differentiated in a duct axial direction between regions with and without the jet-flow interference part 22A to reduce generation of noise.

A gasification burner for a multiple-burner arrangement in an entrained-flow gasifier, in which the gasification burner extends along a main axis and in which the media for the gasification reaction in the gasification burner are guided in separate media channels and exit at the burner mouth in a direction having an angle to the main axis that is not zero. A vertical installation with an optimally adaptable flame shape is provided. Depending on the orientation of the burners, the flame shape is adaptable, whether it be a minimized total flame diameter for an initial slag formation of the cooling screen or an increase in the total twist of the total flame for an increased particle deposition on the reactor wall. The gasification burner with angled burner tips can be used as part of a retrofit.

A gasification burner for a multiple-burner arrangement in an entrained-flow gasifier, in which the gasification burner extends along a main axis and in which the media for the gasification reaction in the gasification burner are guided in separate media channels and exit at the burner mouth in a direction having an angle to the main axis that is not zero. A vertical installation with an optimally adaptable flame shape is provided. Depending on the orientation of the burners, the flame shape is adaptable, whether it be a minimized total flame diameter for an initial slag formation of the cooling screen or an increase in the total twist of the total flame for an increased particle deposition on the reactor wall. The gasification burner with angled burner tips can be used as part of a retrofit.

A method is provided for heating a furnace arranged with a heating zone heated with a burner providing a flame extending in a longitudinal direction and fed with a fuel and a primary oxidant, the burner is operated with a mass relationship between the fed fuel and primary oxidant permitting less than 50% of the fed fuel to be combusted using the primary oxidant, and a respective pair of secondary oxidant lances are provided one either side of the furnace pointing into the heating zone, lancing a secondary oxidant into the heating zone downstream of the burner substantially parallel with a cross plane, such that a temperature is measured downstream of the lances and that each of the lance pairs includes an upstream, low-speed first and a downstream, high-speed second lance, wherein the amount of secondary oxidant supplied via the first lance is regulated to achieve a homogenous lateral temperature profile. A related furnace is also provided.

A burner assembly for top combustion hot blast stove including a burner surrounded by a burner shell, where the burner has a circular cross-section; a number of air nozzles arranged for tangentially feeding air to the burner, the air nozzles being connected to one or more air distribution chambers; a number of gas nozzles arranged for tangentially feeding gas to the burner, the gas nozzles being connected to one or more gas distribution chambers; wherein the air nozzles are arranged in one or more inclined or vertical stacked arrays of air nozzles, each inclined or vertical stacked array being in connection with one inclined or vertical air distribution chamber; the gas nozzles are arranged in one or more inclined or vertical stacked arrays of gas nozzles, each inclined or vertical stacked array being in connection with one inclined or vertical gas distribution chamber; and the inclined or vertical air distribution chamber(s) and the inclined or vertical gas distribution chamber(s) are arranged along the circumference of the burner shell.

A burner assembly for top combustion hot blast stove including a burner surrounded by a burner shell, where the burner has a circular cross-section; a number of air nozzles arranged for tangentially feeding air to the burner, the air nozzles being connected to one or more air distribution chambers; a number of gas nozzles arranged for tangentially feeding gas to the burner, the gas nozzles being connected to one or more gas distribution chambers; wherein the air nozzles are arranged in one or more inclined or vertical stacked arrays of air nozzles, each inclined or vertical stacked array being in connection with one inclined or vertical air distribution chamber; the gas nozzles are arranged in one or more inclined or vertical stacked arrays of gas nozzles, each inclined or vertical stacked array being in connection with one inclined or vertical gas distribution chamber; and the inclined or vertical air distribution chamber(s) and the inclined or vertical gas distribution chamber(s) are arranged along the circumference of the burner shell.

A method for operating a combustion chamber is provided. The method includes introducing a fuel into the combustion chamber via a plurality of nozzles, each nozzle having an associated stoichiometry for an output end of the nozzle. The method further includes measuring the stoichiometry of each nozzle via one or more sensors to obtain stoichiometric data, and determining that at least one of a frequency and an amplitude of spectral line fluctuations derived from the stoichiometric data has exceeded a threshold. The method further includes adjusting the stoichiometry of at least one of the nozzles based at least in part on the stoichiometric data so as to maintain a flame stability of the combustion chamber.

A gas turbine engine and combustor assembly including a combustor liner defining therein a combustion chamber for the downstream flow of a main fluid. At least two axially spaced apart annular trapped vortex cavities are located on the combustor liner and staged axially and radially spaced apart. A cavity opening is located at a radially inner end of each of the at least two annular trapped vortex cavities. A plurality of injectors are configured tangentially relative to circular radially outer wall extending between an aft wall and a forward wall of each cavity to provide for an injection of air and fuel to form an annular rotating trapped vortex of a fuel and air mixture within a respective annular trapped vortex cavity. The annular rotating trapped vortex of the fuel and air mixture at the cavity openings is substantially perpendicular to the downstream flow of the main fluid.