A gas turbine engine includes a compressor section, combustion section, and turbine section is serial flow arrangement. A fuel injector supplies a mixture of fuel and air for combustion within the combustion section. An outer wall defines a mixing passage extending along a stream-wise direction including a first mixing region and a second mixing region. A first fuel passage supplies a first fuel to the first mixing region and an air passage supplies a supply of air to the first mixing region. A second fuel passage supplies a second fuel to the second mixing region.

A burner assembly for a boiler unit for the production of steam extends along a longitudinal axis and comprises: a plurality of fuel conduits in which, in use, at least one fuel flows in a forward direction; a plurality of fuel injection nozzles, connected to respective fuel ducts for discharging, in use, fuel into a combustion chamber of the boiler unit; a first manifold connected to a first group of fuel conduits and to a first fuel source by means of a first supply line provided with a first regulating valve; at least one second manifold connected to a second fuel line assembly and to a source of a second fuel by means of a second supply line provided with a second regulating valve; and a control device configured for adjusting the first regulating valve and the second regulating valve based on the energy demand of the boiler unit and based on at least one characteristic parameter of the first fuel and/or the second fuel.

Co-firing a combustor with gas fuel and ammonia using various approaches is disclosed. Each method fires a gas fuel in a primary combustion zone using a head end fuel nozzle, in a secondary combustion zone using a first axial fuel stage (AFS) injector set, and/or a tertiary combustion zone using a second AFS injector set over a particular combustor load range, and transitions to firing with ammonia using an ammonia atomizer. The methods may transition to ammonia combustion alone or ammonia with gas fuel combustion. The cross flow of the first AFS injector set stabilizes combustion of ammonia, and the second AFS injector set provides a quenching effect, each of which contributes to efficient ammonia combustion with or without gas fuel combustion.

The provided is a coaxially staged burner for a low-emission combustion chamber of a dual-fuel gas turbine utilizing gaseous and liquid fuels. The coaxially staged burner includes a mounting flange, a main fuel sleeve, and a swirler, where the mounting flange is provided with a fuel supply port; the main fuel sleeve is internally provided with coaxially nested four-stage fuel sleeves; the swirler includes a center pilot stage, a first premix stage, a second premix stage, a first-stage hub, and a second-stage hub; when a liquid fuel operates alone, the liquid fuel enters a swirler passage through a pilot-stage liquid fuel nozzle and a second-stage blade liquid fuel hole to achieve premixing and evaporation; and when a gaseous fuel operates alone, the gaseous fuel enters the swirler passage through a first-stage blade fuel hole and a second-stage blade gaseous fuel hole for mixing.

The provided is a coaxially staged burner for a low-emission combustion chamber of a dual-fuel gas turbine utilizing gaseous and liquid fuels. The coaxially staged burner includes a mounting flange, a main fuel sleeve, and a swirler, where the mounting flange is provided with a fuel supply port; the main fuel sleeve is internally provided with coaxially nested four-stage fuel sleeves; the swirler includes a center pilot stage, a first premix stage, a second premix stage, a first-stage hub, and a second-stage hub; when a liquid fuel operates alone, the liquid fuel enters a swirler passage through a pilot-stage liquid fuel nozzle and a second-stage blade liquid fuel hole to achieve premixing and evaporation; and when a gaseous fuel operates alone, the gaseous fuel enters the swirler passage through a first-stage blade fuel hole and a second-stage blade gaseous fuel hole for mixing.

Disclosed is a mixed combustion system fueled with ammonia, hydrogen and natural gas, which comprises a furnace chamber, a combustor, a heat exchanger, a mixer and a storage tank, the combustor and a conical combustion cavity are installed in the furnace chamber, the storage tank is provided with a first branch pipeline through a conveying pipe to be connected with the heat exchanger, the heat exchanger is connected with an inlet of the mixer, and an outlet of the mixer is connected with a fuel inlet of the combustor; and the conveying pipe is provided with a second branch pipeline connected with an ejector port of a first ejector, the first ejector is installed on a flue gas recirculating pipe connected with a furnace chamber flue gas exhaust pipeline, and the other end of the flue gas recirculating pipe is connected with an auxiliary fuel inlet of the combustor.