The present invention is a method of optimizing radiant and thermal efficiency of a gas fired radiant tube heater. A heat exchange blower receives intake air and delivers intake air through a heat exchanger as pre-heated air to a combustion air blower. The combustion air blower receives pre-heated intake air from the heat exchanger and then provides the pre-heated intake air to a burner for mixing with fuel. The fuel-intake air mixture is burned in the burner thereby producing combustion gasses which are fired into a radiant tube. The exhaust combustion gases pass through the balance of the radiant tube and through the heat exchanger where residual heat is transferred and extracted from the combustion gases to pre-heat the intake air. The turbulators are configured to increase the turbulence within the radiant tube and are placed within the initial 10′ to 30′ of the radiant tube after the burner to increase the tube temperature and the radiation emitted from this section of the radiant tube.

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 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.

Clean combustion and equilibration equipment and methods are provided to progressively deliver, combust and equilibrate mixture of fuel, oxidant and aqueous diluent in a plurality of combustion regions and in one or more equilibration regions to further progress oxidation of products of incomplete combustion, in a manner that sustains combustion while controlling temperatures and residence times sufficiently to reduce CO and NOx emissions to below 25 ppmvd, and preferably to below 3 ppmvd at 15% O.sub.2.

Clean combustion and equilibration equipment and methods are provided to progressively deliver, combust and equilibrate mixture of fuel, oxidant and aqueous diluent in a plurality of combustion regions and in one or more equilibration regions to further progress oxidation of products of incomplete combustion, in a manner that sustains combustion while controlling temperatures and residence times sufficiently to reduce CO and NOx emissions to below 25 ppmvd, and preferably to below 3 ppmvd at 15% O.sub.2.

The present invention relates to a combustion apparatus capable of reducing the emission amount of nitrogen oxide and enabling stable combustion in the entire area of a set load. The combustion apparatus includes: a premixing chamber for premixing air and a gas; a blower for supplying a mixed-gas of the air and the gas to a burner; a combustion chamber for burning the mixed-gas by ignition of the burner; a heat exchanger for exchanging heat with water by using combustion heat in the combustion chamber; and an exhaust gas discharge part for discharging the exhaust gas passing through the heat exchanger, wherein the premixing chamber is formed in a Venturi shape having a throat part of which the cross-section area is tapered between an inlet and an outlet through which the air passes, the throat part of the premixing chamber being connected to a gas supply part for supplying a gas for combustion, and to an exhaust gas recirculation tube to which some of the exhaust gas having passed through the heat exchanger is introduced in proportion to differential pressure according to the flow rate of the mixed-gas passing through the throat part.

The present invention relates to a combustion apparatus capable of reducing the emission amount of nitrogen oxide and enabling stable combustion in the entire area of a set load. The combustion apparatus includes: a premixing chamber for premixing air and a gas; a blower for supplying a mixed-gas of the air and the gas to a burner; a combustion chamber for burning the mixed-gas by ignition of the burner; a heat exchanger for exchanging heat with water by using combustion heat in the combustion chamber; and an exhaust gas discharge part for discharging the exhaust gas passing through the heat exchanger, wherein the premixing chamber is formed in a Venturi shape having a throat part of which the cross-section area is tapered between an inlet and an outlet through which the air passes, the throat part of the premixing chamber being connected to a gas supply part for supplying a gas for combustion, and to an exhaust gas recirculation tube to which some of the exhaust gas having passed through the heat exchanger is introduced in proportion to differential pressure according to the flow rate of the mixed-gas passing through the throat part.

A radiant tube recuperative burner assembly having a heat exchanger (13) and a burner (11); said heat exchanger (13) comprises: a first inner tube (15); a second heat exchanger tube (16) coaxial and external to the first tube (15); a third tube (24) coaxial and external to said second tube (16); a fourth tube (35) positioned perpendicular to said first tube (15); a fifth tube (36) coaxial and internal to said fourth tube (35); a flue gas outlet passage (27) positioned inside said fifth tube (36); a first gap (17) between said first tube (15) and said second tube (16); a second gap (25) between said third tube (24) and said second tube (16); a sixth gap (40) between said fourth tube (35) and said fifth tube (36); said first gap (17) communicates with said sixth gap (40); said second gap (25) communicates with said flue gas outlet passage (27); a Venturi tube (41, 52) positioned transverse to said fifth tube (36); the inlet of the Venturi tube (41, 52) communicates with said sixth gap (40); said Venturi tube (41, 52) has an outlet that is in communication with said flue gas outlet passage (27); and with a connection pipe (42) between said heat exchanger (13) and said burner (11).

A radiant tube recuperative burner assembly having a heat exchanger (13) and a burner (11); said heat exchanger (13) comprises: a first inner tube (15); a second heat exchanger tube (16) coaxial and external to the first tube (15); a third tube (24) coaxial and external to said second tube (16); a fourth tube (35) positioned perpendicular to said first tube (15); a fifth tube (36) coaxial and internal to said fourth tube (35); a flue gas outlet passage (27) positioned inside said fifth tube (36); a first gap (17) between said first tube (15) and said second tube (16); a second gap (25) between said third tube (24) and said second tube (16); a sixth gap (40) between said fourth tube (35) and said fifth tube (36); said first gap (17) communicates with said sixth gap (40); said second gap (25) communicates with said flue gas outlet passage (27); a Venturi tube (41, 52) positioned transverse to said fifth tube (36); the inlet of the Venturi tube (41, 52) communicates with said sixth gap (40); said Venturi tube (41, 52) has an outlet that is in communication with said flue gas outlet passage (27); and with a connection pipe (42) between said heat exchanger (13) and said burner (11).