Abstract: A heater can be configured to operate with either a first fuel at a first pressure or a second fuel at a second pressure. In some embodiments, a pressure regulator unit is configured to regulate the pressure of either the first fuel or the second fuel and to direct either the first fuel or the second fuel towards a combustion chamber. A nozzle assembly can be configured to inject the fuel into the combustion chamber.

Abstract: A burner for a furnace includes an inner wall defining a central burner chamber. The inner wall includes a plurality of inner wall openings to admit a fuel flow into the central burner chamber. The burner further includes an outer wall which, defines an annulus for the fuel flow to the plurality of inner wall openings. An igniter is located in the central chamber. A furnace includes a heat exchanger and one or more burners disposed at and aligned with one or more burner openings of the heat exchanger. The one or more burners include an inner wall defining a central burner chamber. The inner wall includes a plurality of inner wall openings to admit a fuel flow into the central burner chamber. The one or more burners further include an outer wall defining an annulus for the fuel flow to the plurality of inner wall openings.

Abstract: The present invention relates to an afterburner for gas from a gasification plant. The afterburner provides an optimal mixture of combustible gas and air, permitting an optimal reaction between the O2 in the air and the gas and creating a mixture ratio that enables the load on a burner to be regulated without altering the mixture ratio between air and gas. This offers the possibility of optimal combustion even during regulation of the burner, over the whole of the relevant regulating range. The result is extremely good combustion and reduced emissions of O2, CO and NOx.

Abstract: In one aspect, a fuel oxygenation apparatus includes a fuel oil supply fluidically coupled to the inlet of a positive displacement pump for delivery of the fuel oil to a fuel oil burner. An oxygen supply is fluidically coupled to the inlet of the positive displacement pump. During the suction cycle, a momentary vacuum is created at the pump inlet side drawing oxygen gas into the fuel line where it admixes with the fuel oil supply. Oxygenating the fuel prior to combustion increases efficiency of the burner and reduces undesirable emissions.

Abstract: A combustor is provided that can ensure combustion stability even when operated on low BTU gas without needing any equipment for preventing back-flow of fuel gas during operation on pilot fuel. The combustor includes a first perforated plate disposed upstream of a combustion chamber, the first plate having a plurality of nozzle holes and air holes; a second perforated plate disposed on the upstream side of the first plate; and a plurality of gas nozzles each of which is inserted into corresponding nozzle holes. The gas nozzle has a leading end located inside the corresponding one of the nozzle holes. Each of the gas nozzles includes a jet hole portion having a diameter smaller than that of a gas jet hole of the gas nozzle; and a passage portion designed to form an air passage on the outer circumference of the leading end portion of the gas nozzle.

Abstract: A burner device (S1) that burns a mixture gas of an oxidant and a fuel includes a partition member (8) which air-permeably partitions an ignition region (R2) for igniting the mixture gas (Y) and a flame retaining region (R3) for maintaining the combustion of the mixture gas (Y), and which also adjusts the flow speed of the mixture gas (Y) supplied from the ignition region (R2) to the flame retaining region (R3), in which the partition member (8) includes a protrusion portion (8a1) that protrudes into an oxidant flow passage (1) and that stops a part of the oxidant flowing through the oxidant flow passage (1) to guide it into a take-in passage region (R1). According to the burner device (S1), with a sufficient amount of oxidant being supplied to a combustion region, it is possible to stabilize a combustion state of the mixture gas and, moreover, to stably produce a high-temperature gas.

Abstract: A system and techniques for waste oil combustion are provided. The techniques include straining waste oil, separating contaminants from the strained waste oil to produce segregated layers of waste oil, selectively drawing a segregated layer of the waste oil, entraining the drawn waste oil to a burner for combustion, and regulating flow rate to produce a controllable amount of heat output. The system includes a container for straining waste oil, a storage drum for separating contaminants from the strained waste oil via gravity separation to produce segregated waste oil, an oil uptake channel for entraining the waste oil from the storage drum, a fuel regulator for controlling rate of flow of the waste oil from the storage drum to a burner head via the oil uptake channel, and a burner head control for repositioning a burner head under the input stream to produce a controllable amount of heat output.

Abstract: A catalytic burner includes a catalyst body and a line element for the supply of a gas mixture to the catalyst body. The catalytic burner also includes a transitional region between the line element and the catalyst body. A swirl element is arranged in the flow region upstream of the catalyst body in the direction of flow.

Abstract: A combustor dome assembly includes a dome plate with upstream and downstream faces and an aperture therein; a deflector with body and a tube section, the deflector fixedly attached to the dome plate adjacent the downstream face with the tube section in the aperture; a retainer having an annular body with a central opening therein, an annular flange, and at least one hook defining a slot, the retainer being fixedly attached to the dome plate adjacent the upstream face of the dome plate with the flange received in the aperture; and an annular mixer with a radial array of swirl vanes and an annular mounting flange, with a retention tab extending radially outward from the mounting flange. The mixer is disposed adjacent the upstream face with the mounting flange against the retainer. The retention tab is engaged in the slot to prevent axial withdrawal of the mixer from the retainer.

Abstract: Adjustable gas grill burners are disclosed. Methods of making and using adjustable gas grill burners are also disclosed.

Abstract: A gas burner apparatus for discharging a mixture of fuel gas, air and flue gas into a furnace space of a furnace wherein the mixture is burned and flue gas having a low content of nitrous oxides and carbon monoxide is formed is provided. The burner tile includes at least one gas circulation port extending though the wall of the tile. The interior surface of the wall of the tile includes a Coanda surface. Fuel gas and/or flue gas conducted through the gas circulation port follows the path of the Coanda surface which allows more flue gas to be introduced into the stream. The exterior surface of the wall of the tile also includes a Coanda surface for facilitating the creation of a staged combustion zone. Also provided are improved burner tiles, improved gas tips and methods of burning a mixture of air, fuel gas and flue gas in a furnace space.

Abstract: A method for regulating a temperature of a combustion medium in a mixing zone of a burner and a method for regulating a burner, in particular an oil burner, a burner performance being modulated. A heating system including a burner, which includes a regulating device, and a regulating device for a burner, in particular an oil burner. The method/system is intended to provide as constant a temperature as possible in the mixing zone during the different operating modes and with changed burner performance. The combustion air flows through a first supply tract in a first operating mode and in adjustable proportions through the first and/or a second supply tract in a second operating mode, and the combustion air is supplied with heat via a heating element, which may be switched on and off, in the first supply tract, and with heat from a combustion zone in the second supply tract.

Abstract: A burner for diluted combustion includes a fuel nozzle for supplying fuel to a combustion chamber, at least one air nozzle for supplying air to the combustion chamber, and at least one oxygen nozzle for supplying oxygen to the combustion chamber. The air nozzle and oxygen nozzle are spatially separated from each other.

Abstract: This invention relates to the production of synthesis gas by partial oxidation of liquid or gaseous, carbonaceous fuel in the presence of an oxygen-containing oxidant, wherein the fuel, the oxidant and a moderator are separately supplied to a burner and wherein the fuel and the moderator are mixed in a mixing chamber of the burner, before they are brought in contact with the oxidant. To reduce the load of the burner in particular during operation with transient conditions, the oxidant is centrally introduced through an outlet opening of the burner into a combustion chamber and the mixture of fuel and moderator is introduced through the outlet opening into the combustion chamber concentrically around the oxidant.

Abstract: A premix burner which comprises a combustion head comprising, in turn, a perforated covering element provided with a plurality of openings. The premix burner is characterised in that it is provided with a device for generating and delivering a minimum granted thermal power completely arranged inside the combustion head. Moreover, the device comprises a concave element, whose concavity faces the internal wall of the perforated covering element.

Abstract: The burner (1) according to the invention comprises a main body (10) provided with an operating cavity (11) open at least on a first side. The burner also comprises first feed means (20) arranged to introduce a flow of a first reagent (for example combustion air) into said cavity and second feed means (31) are arranged to introduce a flow of a second reagent (for example fuel) into the same operating cavity. The first means are configured so as to introduce the first reagent according to a tangential direction, while the second means are configured to introduce the second reagent according to a direction parallel to the direction in which the cavity extends. According to the invention the operating cavity comprises a first portion between the intake position of the first reagent and the intake position of the second reagent. This first portion defines a stabilization chamber of the flow of the first reagent.

Abstract: A burner and a cooker including the burner are provided. The burner includes a burner port, an ignition unit configured to ignite a mixture gas in the burner port, a combustion member located between the burner port and the ignition unit, a plurality of combustion compartments defined by portions of the burner port and the combustion member to allow combustion of the mixture gas in the combustion compartments, and an ignition compartment defined by the remaining portions of the burner port and the combustion member to allow ignition of the mixture gas supplied from the combustion compartments, whereby a flame generated by igniting the mixture gas in the ignition compartment is propagated to the combustion compartments. The cooker includes a cooking cavity, the burner, mixing tubes for the mixture of gas, and a door closing the cooking cavity.

Abstract: A gas burner including a burner body having a lower housing, an inlet conduit and a combustion surface element attached to the lower housing. A diffuser/reflector positioned within the body encourages even distribution and mixing of a combustible gas/air mixture. The diffuser/reflector is preferably of a sheet metal construction and includes a plurality of stamped openings with each of these openings having an overhanging guide plate. The combustion surface element includes a plurality of integrally formed rigidizing ribs and is made from a high temperature steel alloy wire cloth. The inlet conduit is secured directly or indirectly to an access door/bulkhead that is used to close off an access opening formed in a water heater wall through which the burner is installed. In one construction, an air scoop shrouds the inlet conduit and at least partially defines a flow path of primary air, substantially isolated from the combustion chamber.

Abstract: A method for burning gas in a burner, including leading the gas through an inner fuel tube and introduction of combustion air through an annular space surrounding the inner fuel tube. This space forms of an outer tube terminated by a conically converging section, wherein the end of the inner fuel tube forms a burner head. The major part of the primary gas is introduced into the upstream end of the burner head, to go into the combustion air that flows past the burner head, whereas a smaller part of a secondary gas is introduced into the free end of the burner head and into the constricted part of the annular channel that surrounds the burner head. The gas flow is accelerated past the burner head due to the reducing cross section and is burned downstream in relation to the burning head.

Abstract: The object is to provide a burner capable of taking in sufficient primary air even though the size thereof is compact, and capable of being used as an all-primary air burner. A burner includes a mixing pipe to which a fuel gas and combustion air are supplied, a burner main body having a mixing chamber at a top end on a downstream side of the mixing pipe, and a burner head which is provided at an upper part of the burner main body while communicating with the mixing chamber and has first and second burner ports for ejecting mixed gas of the fuel gas and air for combustion mixed in the mixing chamber. The burner further includes an extension pipe in the burner main body protruding inside the mixing chamber being formed by extending the mixing pipe.

Abstract: A cooking appliance equipped with at least one regulating valve having a rotary regulator organ. The rotary regulator organ has an actuating shaft a plurality of peripheral openings adapted for regulating a flow of gas through the regulating valve. In a first angular position the rotary regulator organ is adapted to supply a constant flow Qmin of a first type of fuel through a first peripheral opening. In a second angular position, successive to the first angular position, the rotary regulator organ is adapted to supply a constant flow Qmin of a second type of fuel through a second peripheral opening. In one implementation a feature that rotates with the actuating shaft is adapted to engage a feature on the cooking appliance to limit the rotation of the rotary regulator organ to the first angular position.

Abstract: A modular flare stack used for the combustion of combustible fluids comprises: a gas feed pipe, at least two burner elements, and an automated control system for applying a fixed stoichiometric combustion to an air/gas venturi mixing system based on a feedback loop from the flue gas temperature. Mixing ratios are obtained either using a fan for gas flows at a lower pressure (less than 0.5 barg) or a venturi for gas flows at a higher pressure (more than 1 barg). The control system also determines the number of operational burner elements and which of the burner elements are to be operational. The flare stack provides premixed surface burners for waste gas streams, thus guaranteeing extremely low emissions and high destruction efficiency by complete combustion with a high turndown ratio.

Abstract: A gas-fired air conditioning furnace comprises a monolithic intake manifold including an inlet at a first end and a plurality of outlets at a second end opposite the first end. In addition, the furnace comprises a burner assembly including a plurality of burners, each burner is configured to combust an air-fuel mixture at least partially within an interior space of the burner. Further, each burner extends into one of the outlets of the intake manifold.

Abstract: A combustion burner 1 includes a fuel nozzle 2 that injects fuel gas prepared by mixing solid fuel and primary air, secondary air nozzles 3, 4 that inject secondary air from the outer periphery of the fuel nozzle 2, and a flame holder 5 that is arranged in an opening of the fuel nozzle 2. In the combustion burner 1, the flame holder 5 has a splitting shape that widens in the flow direction of the fuel gas. When seen in cross section along a direction in which the flame holder 5 widens, the cross section passing through the central axis of the fuel nozzle 2, a maximum distance h from the central axis of the fuel nozzle 2 to the widened end of the flame holder 5 and an inside diameter r of the opening 21 of the fuel nozzle 2 satisfy h/(r/2)<0.6.

Abstract: A device for intensifying a flame, comprising an object intended to be placed in front of the burner head, at a distance from said burner head, so that it is placed at least partly inside a flame extending from the burner head, and furthermore, said object being arranged to glow, heated by said flame. An apparatus for applying the device, for heating a liquid or air, comprising a burner and a combustion chamber, wherein the apparatus comprises an object in the combustion chamber. In the method, the device is installed in front of the burner head, or in an apparatus for heating a liquid or air, comprising an opening for the burner head, and a combustion chamber.

Abstract: A gas burner for simplifying assembling and manufacturing of a burner flame hole unit by overlapping plates. Portions of the plates are cut so that the cut portions communicate with each other. Flame holes and mixture channels for a mixture of gas and air pass through a gap between the cut portions. The cut portions overlap and communicate with each other between adjacent plates, thereby forming flame holes and channels for flow of the mixture of gas and air through gaps between the cut portions.

Abstract: The invention provides a nozzle-mixed burner for use in an endothermic process such as hydrogen reforming or ammonia reforming or ethylene cracking or EDC cracking. The burner comprises a fuel duct extending axially through a wall of the furnace. The fuel duct delivers gaseous fuel to an array of nozzles extending laterally to spray the fuel outwardly into an annular chamber defined by a cap. Combustion air is delivered to the chamber by way of a primary air duct. A convergent-divergent section of the duct and an outwardly divergent section of the chamber together form a radially extending venturi. Combustion of the fuel, supplemented by the venturi effect, draws the air through the duct by natural inspiration.

Abstract: A combustion device has tubular burners with mixing tubes made by joining together two plate members which have formed therein half-split mixing tubes at a distance from one another and which, when joined together, form a clearance serving as a carryover flame hole to communicate a mixing tube with an adjoining mixing tube. An intermediate flame hole portion is formed by recessing backward the front end of the carryover flame hole. A cover portion is formed in each of the two plate members so as to lie opposite to each other with a recessed space lying therebetween. The recessed space is defined as a space that is generated between the intermediate flame hole portion and a line that is drawn in front of the intermediate flame hole portion along the same longitudinal direction as the front end, except for the part of the intermediate flame hole portion.

Abstract: Burner (5) for a gas burning hand tool (1), of the type comprising an elongated burner body (21), associated at opposite ends of the body with a gas injection zone (17) and a gas combustion zone (19). The gas injection zone (17) comprises at least one outlet orifice (35) terminating flush on the outside of the periphery (25) of the burner body (21), this periphery (25) promoting the circulation of the gas outside the burner body (21) to the combustion zone (19). Gas burning hand tool equipped with a burner of this type.

Abstract: The invention relates to a method of manufacturing a front face (21) for a burner (1), particularly for the gasification of solid carbonaceous materials by partial combustion. The front face (21) comprises a central aperture (23) corresponding to the discharge end of the burner, a front side wall (24) and a backside wall (25) spaced by one or more baffles (26) defining a coolant flow path with a coolant inlet (30) and a coolant outlet (31). The front side wall (24) and the one or more baffles (26) are made of a single piece of metal and the backside wall (25) is welded on the free top ends of the one or more baffles. The front face can for example be made of a steel according to UNS N07718.

Abstract: A burner assembly comprising a burner casing having two or more separate chambers therein, the chambers being divided from each other by one or more walls. The assembly also comprises one or more input conduits each configured to deliver different fuel-air mixtures to at least one of the separated chambers.

Abstract: There is provided a combustion plate in which the combustion resonant sounds and instability at the time of high-load combustion can be resolved and in which a large opening ratio of the flame holes can be secured. Flame holes of an equal diameter are formed evenly over an entire surface of a combustion region of a plate main body in such a positional relationship that adjoining three flame holes form an equilateral triangle. Provided that a flame hole group which is made up of six flame holes disposed in a positional relationship to form an equilateral hexagon and one flame hole in the center of the equilateral hexagon is defined as a unit flame hole group when disposed adjacent to another flame hole group across a large equilateral hexagon enclosing the equilateral hexagon, there is formed in the surface of the plate main body a bottomed hole.

Abstract: A propane fueled combustor for providing a controlled heat flux environment of twenty to two hundred kilowatts per square meter. The combustor has the capability of generating a repeatable and quantifiable environment in which to evaluate a response of an energetic material to a fast cook off hazard, such as a liquid fuel fire.

Abstract: The present invention relates to vessel design that enhances candle performance by separating the inlet air from the active scent while accelerating the active scent. The chimney-like assembly accelerates active scent flow, thus propelling active scent faster and further from the candle. The separation of inlet air from active scent produces an efficient laminar flame with minimal flame movement and flickering, thus reducing the soot potential.

Abstract: A burner ring for a gas burner, the burner ring including an outer circumference and an inner circumference, a distribution chamber having gas outlets to the outer circumference of the burner ring, a transfer ignition groove that is outwardly open on one side and extends between the inner circumference of the burner ring and the outer circumference of the burner ring, a gas conducting channel into which the transfer ignition groove opens at least partially, and at least one gas supply opening between the distribution chamber and the gas conducting channel, wherein the gas conducting channel and the transfer ignition groove are arranged mutually symmetrically, and wherein the at least one gas supply opening is offset in a region of the gas conducting channel at an angle relative to the transfer ignition groove.

Abstract: The invention relates to an improvement for a low pressure gas lamp, and more specifically for a venturi tube in order to furnish a more efficient flame.

Abstract: Burner assemblies including panels (e.g., transparent panels) supported in a substantially parallel, closely-spaced relationship and gaskets and spacers sealing the space between the panels to form a perimeter seal and to define a plenum between the first and second panels with an inlet into the plenum and an outlet out of the plenum.

Abstract: A gas burner for use in water heaters, boilers, cooking appliances or the like uses a ceramic cylindrical body to increase conductivity of the gas burner. The gas burner comprises a solid ceramic perforated tube and a flange arranged on one end of the tube. The burner assembly also compromises a cap arranged on the opposite end of the tube from that of the flange, wherein the tube has turn down characteristics of approximately 30 to 1. The tube is manufactured by molding a non-perforated shell within a die assembly. The non-perforated shell is then dried to a predetermined moisture content and machined with a plurality of orifices into the shell to create the burner tube for a ceramic burner assembly.

Abstract: A gas burner apparatus for discharging a mixture of fuel gas, air and flue gas into a furnace space of a furnace wherein the mixture is burned and flue gas having a low content of nitrous oxides and carbon monoxide is formed is provided. The burner tile includes at least one gas circulation port extending though the wall of the tile. The interior surface of the wall of the tile includes a Coanda surface. Fuel gas and/or flue gas conducted through the gas circulation port follows the path of the Coanda surface which allows more flue gas to be introduced into the stream. The exterior surface of the wall of the tile also includes a Coanda surface for facilitating the creation of a staged combustion zone. Also provided are improved burner tiles, improved gas tips and methods of burning a mixture of air, fuel gas and flue gas in a furnace space.

Abstract: A burner includes a first fuel feed and a first oxidant feed surrounding the first fuel feed in the shape of a ring. The burner includes a second fuel feed arranged about the first oxidant feed in the shape of a ring, and a second oxidant feed arranged about the second fuel feed in the shape of a ring. In addition, a plurality of oxygen lances are provided, which have a smaller radial distance from the burner centre than the second fuel feed.

Abstract: A gas burner apparatus for discharging a mixture of fuel gas, air and flue gas into a furnace space of a furnace wherein the mixture is burned and flue gas having a low content of nitrous oxides and carbon monoxide is formed is provided. The burner tile includes at least one gas circulation port extending though the wall of the tile. The interior surface of the wall of the tile includes a Coanda surface. Fuel gas and/or flue gas conducted through the gas circulation port follows the path of the Coanda surface which allows more flue gas to be introduced into the stream. The exterior surface of the wall of the tile also includes a Coanda surface for facilitating the creation of a staged combustion zone. Also provided are improved burner tiles, improved gas tips and methods of burning a mixture of air, fuel gas and flue gas in a furnace space.

Abstract: Mixing devices for mixing fuel and air for a premix burner or furnace and furnaces (e.g., premix) with mixing devices. Furnaces may be for heating an occupied space, and may produce lower NOx emissions. A mixing device may be located within an inlet tube, may have a surface that is perpendicular to the direction of fuel flow or that forms a circle, or may have two surfaces held at substantially opposite angles to induce swirl. A portion of the mixing device may extend over an orifice of the fuel injector. A mixing device may be attached to the fuel injector, may be made from a piece of sheet metal, and may have a hole for attachment to the fuel injector. Mixing devices may have a center, two arms, and two ends, which may be separated by bends. A burner plate may be sandwiched between surfaces to allow for expansion.

Abstract: Gas burner provided with a plurality of concentric flame crowns, and comprising a first central burner to supply a peripheral flame ring, a second annular burner surrounding the central burner at a defined distance and able of supplying at least a respective peripheral ring, a burner body apt to be mounted on the surface of a cooking hob, a first gas inlet in communication with the body, a first vertical gas injector, the central burner being provided with a first chamber for the diffusion of the air/gas mixture, a second gas inlet in communication with the body, wherein the second annular burner is provided with two separate chambers for the diffusion of the mixture, wherein the second gas inlet is in communication with the two separate chambers through suitable injection and conveying means, which comprise two distinct injectors in communication with the second gas inlet, and two respective horizontal Venturi pipes each of which being able of supplying with the air/gas mixture a respective of the two diffus

Abstract: A burner for a combustion apparatus, a combustion apparatus comprising such burners, and a method of operation of the same are described. The burner comprises: a fuel input conduit for supplying fuel to the burner; a combustion gas input conduit for supplying combustion gas to a first stage combustion site; an overfire gas input conduit for supplying overfire gas to a second stage combustion site; and gas supply means; wherein the gas supply means is adapted to supply gas switchably between a first mode of operation wherein air is supplied in suitable proportion to both the combustion gas input conduit and the overfire gas input conduit; and a second mode of operation wherein an oxygen containing gas other than air is supplied to the combustion gas input conduit and substantially no gas is supplied to the overfire gas input conduit.

Abstract: A device for producing a stable and augmented flame includes a fluid-inducing assembly and a shield. The fluid-inducing assembly includes a flow-diverting mechanism defining a flow-intake end and a flow-accelerating end and includes a plurality of vanes extending from the flow-intake end to the flow-accelerating end. The plurality of vanes are circumferentially disposed and spaced from one another. Furthermore, two vanes include a space defined therebetween and the space defines a passage which is spiral-shaped. The flow-diverting mechanism further includes a covering member with an enclosed circumferential edge circumferentially surrounded such that where each vane in the flow-accelerating end is encircled by the covering member and where each vane in the flow-intake end is exposed to outside and not covered by the covering member. In addition, the shield is hollow and is disposed above the fluid-inducing assembly.

Abstract: A gas burner for low NOx gas furnaces is disclosed with improved flame carryover for igniting one or more adjacent burners. The burner includes a burner tube that receives a mixture of fuel and air. The burner tube is coupled to an outlet. The outlet includes a primary outlet opening which is in communication with at least one transverse slot for communicating a flame to at least one adjacent burner. The primary outlet opening may be elliptical and the outlet further may also include a concave outer face through which the primary outlet opening extends. The at least one slot may include a pair of oppositely directed transverse slots extending outward from the primary outlet opening along a semi-minor axis of the primary outlet opening.

Abstract: A burner having a variable output structure includes a flame-hole plate having a plurality of flame holes located on a surface of the flame-hole plate. The plurality of flame holes are exposed to a combustion chamber. Further, the burner can include a flame hole adjusting unit configured to change an output of the burner by adjusting a size of each of the plurality of flame holes according to a load required in a combustion device.

Abstract: A burner has a fuel/oxidant nozzles and a pair of dynamical lances spaced on either side thereof that inject a jet of fuel and primary oxidant along a fuel injection axis, and jets of secondary oxidant, respectively. Jets of actuating fluid impinge against the jets of secondary oxidant to fluidically angle the jets of secondary oxidant away from the fuel injection axis. The action of the angling away together with staging of the oxidant between primary and secondary oxidant injections allows achievement of distributed combustion conditions.

Abstract: For cooking appliances, a gas burner presenting externally at least one annular portion (50), characterized by presenting two gas inlets (3, 10), with which at least two injectors (4, 11) are associated respectively; the first gas inlet (3) supplying the air/gas mixture to a first annular chamber (55) provided in said annular portion (50) and communicating with a series of main ports (24) through which said mixture leaves to form at least one main flame ring (43) in the outer circumference of the annular portion (50); the second gas inlet (10) supplying the air/gas mixture to a second annular chamber (55) provided in said annular portion (50) and feeding a flame ring (27) which constitutes the only flame ignited in the burner when this is operating at minimum power.

Abstract: A row of rich-side flame holes is centrally arranged. Two rows of lean-side flame holes are arranged on both sides of the rich-side flame hole row, respectively. In addition, two rows of rich-side flame holes are arranged on the outsides of the two lean-side flame hole rows, respectively. A lower end part of a central rich-side burner part is projected into a tubular part into which the rich-side mixture is introduced, and communication holes in fluid communication with an inner space are formed in walls on both sides so as to pass completely therethrough in alignment with each other. Each communication hole has a larger diameter than an inner width P and is disposed at a portion situated nearer to the upper of the tubular part and nearer to the front so as to leave, at the rear, a space in which dust p particles are accumulated.