Embodiments of the present invention include high-temperature staged recirculating burners and radiant tube burner assemblies that provide high efficiency, low NOx and CO emissions, and uniform temperature characteristics. One such staged recirculating burner includes a combustion tube having inside and outside helical fins forming opposing spiral pathways for combustion gases and products of combustion, a combustion nozzle coupled to the combustion tube, a gas tube running axially into the combustion tube, and a staging gas nozzle coupled to the gas tube, where the staging gas nozzle includes radial exit holes into the combustion tube and an axial gas staging tube extending into the combustion nozzle to stage combustion.

A combustion method in which heated flue gas heats a regenerator through which a mixture of fuel and flue gas is then passed to undergo endothermic reactions that produce syngas which is fed into a furnace together with a motive gas stream.

A combustion method in which heated flue gas heats a regenerator through which a mixture of fuel and flue gas is then passed to undergo endothermic reactions that produce syngas which is fed into a furnace together with a motive gas stream.

Embodiments of the present invention include high-temperature staged recirculating burners and radiant tube burner assemblies that provide high efficiency, low NOx and CO emissions, and uniform temperature characteristics. One such staged recirculating burner includes a combustion tube having inside and outside helical fins forming opposing spiral pathways for combustion gases and products of combustion, a combustion nozzle coupled to the combustion tube, a gas tube running axially into the combustion tube, and a staging gas nozzle coupled to the gas tube, where the staging gas nozzle includes radial exit holes into the combustion tube and an axial gas staging tube extending into the combustion nozzle to stage combustion.

Regenerative burner for non-symmetrical combustion and a method of firing the burner. The burner includes a burner housing enclosing a burner plenum; a fuel conduit extending longitudinally within the housing and positioned coaxial with a line spaced from a central axis of the burner, with the fuel conduit defining a fuel exit opening; and a baffle positioned at least partially around the fuel conduit and defining an air conduit extending into the housing and defining an air opening on an opposite side of the burner central axis from the fuel exit opening. The baffle also defines a cavity adjacent the fuel exit opening and in communication with the fuel conduit through the fuel exit opening. The sidewall of the cavity converges from a central axis of the fuel conduit to provide further jet penetration into the furnace and achieve greater levels of products of combustion entrainment prior to combustion.

An oxygen-fuel combustor and a method for injecting oxygen and fuel. The oxygen-fuel combustor includes a discharge head unit coupled to a heating furnace and a central supply unit in which, among fuel and primary oxygen, at least the fuel is supplied to the heating furnace. An oxygen supply unit supplies secondary oxygen to the heating furnace. The fuel is injected through a central nozzle unit. Secondary oxygen supplied from the oxygen supply unit is injected through an oxygen nozzle unit. The oxygen nozzle unit includes an accommodation cone part is recessed to decrease in diameter from an entrance. An inclined injection hole part passes through at an incline from the accommodation cone part toward an exit such that the injection direction of the fuel and injection direction of the secondary oxygen cross each other in front of the discharge head unit.

An oxygen-fuel combustor and a method for injecting oxygen and fuel. The oxygen-fuel combustor includes a discharge head unit coupled to a heating furnace and a central supply unit in which, among fuel and primary oxygen, at least the fuel is supplied to the heating furnace. An oxygen supply unit supplies secondary oxygen to the heating furnace. The fuel is injected through a central nozzle unit. Secondary oxygen supplied from the oxygen supply unit is injected through an oxygen nozzle unit. The oxygen nozzle unit includes an accommodation cone part is recessed to decrease in diameter from an entrance. An inclined injection hole part passes through at an incline from the accommodation cone part toward an exit such that the injection direction of the fuel and injection direction of the secondary oxygen cross each other in front of the discharge head unit.

Oxycombustion process wherein a combustor is fed with a fuel, a comburent and compounds under the form of coherent aggregates having Young modulus 10.sup.4 MPa, the combustor being isothermal and flameless.

Oxycombustion process wherein a combustor is fed with a fuel, a comburent and compounds under the form of coherent aggregates having Young modulus 10.sup.4 MPa, the combustor being isothermal and flameless.

A combustion method in which heated flue gas heats a regenerator through which a mixture of fuel and flue gas is then passed to undergo endothermic reactions that produce syngas which is fed into a furnace together with a motive gas stream.