A combined combustion burner and a combustion apparatus including the combined combustion burner. The combined combustion burner may include a center tube forming a center passage configured to supply cooling air, a fuel tube surrounding the center tube and forming a fuel passage through which premixed fuel mixed with solid fuel and primary air is sprayed, a secondary tube surrounding the fuel tube and forming a secondary passage through which secondary air is sprayed, and an additional spray nozzle inserted inside the center tube and configured to spray auxiliary fuel containing ammonia.

A burner includes a multiple pipe including an inner pipe and outer pipes. The inner pipe and the outer pipes are located coaxially about a burner axis. The multiple pipe includes: a fuel discharge port located at a downstream end of the inner pipe and discharges a fuel-air mixture containing main fuel and primary combustion air which have been supplied to the inner pipe; a secondary air outlet which is located at an outer peripheral side of the fuel discharge port and emits secondary combustion air which has been supplied to between the outer pipes; and an annular gas fuel outlet which is located between the fuel discharge port and the secondary air outlet and emits gas fuel as auxiliary fuel which has been supplied to between the inner pipe and the outer pipes, toward a boundary between flow of the fuel-air mixture and flow of the secondary combustion air.

A burner includes: a first nozzle including a main fuel outlet that discharges a fuel-air mixture containing main fuel and primary combustion air and a flame holding plate around the outlet; and a second nozzle located coaxially with the first and including a secondary air outlet that emits secondary combustion air at an outer peripheral side of the main fuel outlet; and auxiliary fuel injection nozzles extending along an outer surface of the first nozzle in parallel with a burner axis. The auxiliary fuel injection nozzles include: auxiliary fuel outlets along an outer peripheral edge of the flame holding plate; or auxiliary fuel outlets inside the outer peripheral edge of the flame holding plate and outside an inner peripheral edge of the flame holding plate. The auxiliary fuel outlets discharge gas fuel as auxiliary fuel toward a boundary between flows of the fuel-air mixture and the secondary combustion air.

A burner includes an oxidant feed passage, a fuel feed passage surrounding the oxidant feed passage, an air feed surrounding the fuel feed passage, a movable air flow diverter and, optionally, a flame nozzle. The movable air flow diverter and/or flame nozzle are independently configured to create one or a plurality of gas recirculation regions adjacent the downstream tip of the burner to improve the mixing and reaction of the fuel and oxidant, and overall combustion process efficiency. A related furnace and method for generating a stable flame with the burner are also provided.

A method of generating a flame from combustion of a fuel, includes moving an oxidant feed through an oxidant feed passage; moving a fuel feed through a fuel feed passage surrounding the oxidant feed passage; moving an air feed containing oxidant within an air feed region surrounding the fuel feed passage along the fuel feed passage; creating a gas recirculation region immediately downstream from the air feed and the fuel feed passage; diverting the air feed for proportioning the air feed around the fuel feed passage for controlling flame stabilization in the gas recirculation region; and igniting a resulting gas mixture.

A combustion method using a fuel combustion device, a cement manufacturing method, and a cement calcination facility including a fuel combustion device, in which while the amount of a fossil fuel used as a fuel supplied to a fuel combustion device provided in various facilities such as a cement calcination facility is reduced, the radiation heat transfer amounts of various burners are maintained, whereby the amount of heat transferred to a heating target such as a powder raw material of cement clinker is maintained to maintain a state suitable for calcination, the amount of carbon dioxide emitted from the various facilities is reduced, and the various facilities can be operated at a low cost, and a fuel combustion device including a fuel supply mechanism having a mechanism that supplies a flammable powder, a mechanism that supplies a fuel gas, and a mechanism that supplies a non-flammable powder are used.