A method heats a furnace process chamber with the combustion of fuel gas. The method heats the process chamber in a preheat mode when the temperature of the process chamber is below the autoignition temperature of the fuel gas. The preheat mode forms preheated combustion air by directing the combustion air through a regenerative bed. A stream of the preheated combustion air is directed into the process chamber in a condition unmixed with fuel gas. The preheat mode also forms a fuel rich mixture of the fuel gas and unheated combustion air. The fuel rich mixture is directed into the process chamber adjacent to the stream of preheated combustion air.

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.

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.

Disclosed is an air heating apparatus including a burner configured to cause a combustion reaction, a heat exchanging device configured to receive heat from combustion gas generated by the combustion reaction and heat water, a heating heat exchanger configured to receive the water heated by the heat exchanging device and exchange heat with the air for heating, a main passage, in which the heat exchanging device and the heating heat exchanger are disposed, and configured such that the water flows therethrough while circulating, and a fan configured to blow the air to the heating heat exchanger.

Disclosed is an air heating apparatus including a burner configured to cause a combustion reaction, a heat exchanging device configured to receive heat from combustion gas generated by the combustion reaction and heat water, a heating heat exchanger configured to receive the water heated by the heat exchanging device and exchange heat with the air for heating, a main passage, in which the heat exchanging device and the heating heat exchanger are disposed, and configured such that the water flows therethrough while circulating, and a fan configured to blow the air to the heating heat exchanger.

The present disclosure seeks to provide a metallic burner tile for use in industrial processes such as cracking. The tile is substantially metallic (e.g. more than 80%) with the balance being ceramic coating on surfaces exposed to high temperature. The tile is lighter and more durable than the current ceramic burners.

The present disclosure seeks to provide a metallic burner tile for use in industrial processes such as cracking. The tile is substantially metallic (e.g. more than 80%) with the balance being ceramic coating on surfaces exposed to high temperature. The tile is lighter and more durable than the current ceramic burners.

A premixed combustion burner includes: a mixing part including a first peripheral wall having a center burner axis, a mixing region for mixing fuel and air in the first peripheral wall, and air supply ports arranged circumferentially and open in the first peripheral wall; a nozzle on the mixing part side, a second peripheral wall having a center burner axis, a premixed gas passage continuous to the second peripheral wall mixing region, and a cooling passage in the second peripheral wall; and a header part proximal to the mixing part, and a first header chamber with a fuel supply port, second header chamber, and fuel ejection port for communication between the second header chamber and mixing region. The first peripheral wall has an outward path connecting the first header chamber and a cooling passage inlet, and a return path connecting cooling passage outlet and the second header chamber.

A pressurized cavity is provided around at least a portion or all of a regenerator, within which gas such as flue gas is maintained at a pressure in excess of the pressure within the regenerator, to protect against leakage of gas through the walls of the regenerator.

A pressurized cavity is provided around at least a portion or all of a regenerator, within which gas such as flue gas is maintained at a pressure in excess of the pressure within the regenerator, to protect against leakage of gas through the walls of the regenerator.