Abstract: A combustion head assembly comprising a mounting plate having a plurality of apertures and adapted for mounting to a boiler, and a plurality of combustion heads removably mounted in each of the apertures. The combustion heads each have a fuel nozzle and ignition tips. There is at least one fuel source removably connected to the fuel nozzles of each of the combustion heads and at least one ignition source removably connected to the ignition tips of each of the combustion heads. There is at least one source of forced air removably connected to said combustion heads, and a controller adapted to operate each combustion head independently of the other combustion heads. Each combustion head can be removed from the assembly for repair and inspection without interrupting the operation of the other combustion heads and the boiler.

Abstract: A process for combustion of a combustible material in which a primary combustible material is introduced into a combustion chamber having an upstream region and a downstream region, and ignited, forming a primary combustion zone. A secondary combustible material is partially combusted in a partial combustor, forming partial combustion products which are then injected into the combustion chamber downstream of the primary combustion zone, forming an oxygen deficient zone downstream of the primary combustion zone.

Abstract: A separated overfire air injection system particularly suited for use in a fossil fuel-fired steam generating power plant and more specifically to a sixpoint separated overfire air tangential firing system employed in such power plants, particularly those embodying dual-chambered furnaces. A method of operating such a fossil fuel-fired steam generating power plant equipped with the sixpoint separated overfire air injection system of the present invention is also disclosed. The separated overfire injection system in accordance with the present invention includes six SOFA windboxes strategically located about the perimeter of the dual-chambered furnace volume so as to be operative to inject separated overfire air into the furnace volume in such a manner as to engage a fireball symmetrically tangential to a circle.

Abstract: In a combustion chamber of a gas-turbine group which essentially comprises a mixing section (2) for premixing an air/fuel mixture (16) and a downstream combustion space (3), a jump (5) in cross section is provided at the transition between the two said flow sections (2/3). This jump (5) in cross section induces the cross section of flow of the combustion space (3) and at the same time forms outer recirculation zones (10) in the combustion space (3). Flow passages (4) branch off in the end phase of the mixing section (2), which flow passages (4) then lead into the outer recirculation zones (10). A portion (9) of the air/fuel mixture flows out of the mixing section (2) through these flow passages (4) and into the outer recirculation zones (10), the portion being enriched here with an additional fuel (6). This fuel (6) is introduced via a circular line (19) provided with bores (18).

Abstract: A burner assembly having improved flame length and shape control is presented, which includes in exemplary emodiments at least one fuel fluid inlet and at least one oxidant fluid inlet, means for transporting the fuel fluid from the fuel inlet to a plurality of fuel outlets, the fuel fluid leaving the fuel outlets in fuel streams that are injected into a combustion chamber, means for transporting the oxidant fluid from the oxidant inlets to at least one oxidant outlet, the oxidant fluid leaving the oxidant outlets in oxidant fluid streams that are injected into the combustion chamber, with the fuel and oxidant outlets being physically separated, and geometrically arranged in order to impart to the fuel fluid streams and the oxidant fluid streams angles and velocities that allow combustion of the fuel fluid with the oxidant in a stable, wide, and luminous flame. Alternatively, injectors may be used alone or with the refractory block to inject oxidant and fuel gases.

Abstract: A device for injecting fuels (4) into compressed gaseous media essentially comprises a cylindrical hollow body (24) with at least one fuel feed passage (2) and means for the introduction of compressed atomization air (5). A swirl chamber (1) is arranged in the interior of the hollow body (24), this swirl chamber being connected via at least one inlet opening (6) to the fuel feed passage (2). The cross-section of the swirl chamber (1) narrows in the direction of flow of the atomization air passed through the interior of the hollow body (24), thereby forming a cone (8). A dividing wall (20), which extends downstream at least as far as the center of the inlet openings (6), is arranged upstream of the swirl chamber (1), between the fuel in the swirl chamber (1) and the atomization air (5). A method for operating the device is furthermore described.

Abstract: A combustion system in which a coal/primary air mixture is discharged from burners located in the corners of the furnace towards an imaginary circle disposed in the center of the furnace. Air is discharged from air nozzles also located in the corners of the furnace in two flow streams--one directed towards the center of the furnace in a combustion-supporting relation to the fuel, and the other along the inner surfaces of the furnace boundary walls to maintain an oxidizing atmosphere and minimize corrosion and slagging.

Abstract: A method for operating a furnace comprising generating NOx at a first NOx generation rate by combustion at a distance from the flue of the furnace and generating NOx at a second NOx generation rate, which is less than the first NOx generation rate, by combustion closer to the flue, and thereafter passing the NOx through the interior of the furnace to and through the flue while both the NOx generated by the first rate and the NOx generated by the second rate dynamically progress toward equilibrium.

Abstract: A fuel injector has an inner pipe within an outer pipe. The distal end of the inner pipe is set back from the distal end of the outer pipe to create a flame stabilization and mixing zone. A combustible gas and air mixture injected through the outer pipe forms a flame shroud around a gas stream injected through the inner pipe. This injector provides increased flame penetration and improved NO.sub.x reduction particularly when used to inject a flame shrouded gas stream into regions of the furnace at which the flue gas is at a temperature not greater than 2400.degree. F.

Abstract: An improved low NO.sub.x burner for firing fuels such as fuel oil, fuel gas and the like having an improved register which includes primary and secondary registers. The primary and secondary registers each have an annular perforated shield covering primary and secondary air inlets. The annular perforated shields form primary and secondary air equalizers which provide a more uniform distribution of combustion air about the register as the combustion air enters the register through primary and secondary air inlets, increasing regulation of combustion air and reducing flame impingement. Annular primary and secondary dampers adjustably cover the primary and secondary air equalizers to slidably adjust the ratio of primary to secondary air entering the primary and secondary registers through the primary and secondary air inlets.

Abstract: In an injection nozzle for introducing fuels into compressed gaseous media, for use in premixing burners for example, the injection nozzle (1) consists primarily of a fuel conduit (2) and a passage branching off from the fuel conduit. The fuel conduit (2) extends lengthwise essentially at right angles to the direction of introduction of the fuel and the passage extends parallel to the direction of introduction of the fuel. The fuel is fed via slots (6) in the fuel conduit and by means of the passage to an atomization edge (5). The inside of the passage is made up of distribution panels (3) between which distribution pins (4) are arranged.

Abstract: A burner for combusting gas and/or liquid fuel and air in an enclosure includes a burner block of non-combustible material, such as ceramic material, having a central opening therethrough communicating with a combustion zone. The burner block has a plurality of spaced apart recirculation gas passageways paralleled to and spaced from the central opening, each of the recirculation gas passageways having an injection passageway communicating with the block member central opening. Fuel, which may be liquid and/or gas, is injected into said burner block central opening. Venturi action causes furnace gas to be drawn from the cool fringes of the combustion zone through the recirculation gas passageways for passage back into the central opening wherein air and fuel are thoroughly mixed and cooled for combustion within the enclosure. This recirculation system serves to reduce the temperature and oxygen content of the local combustion process to thereby reduce NO.sub.x production.

Abstract: A process for combustion in an industrial furnace (1), using at least one burner (2; 3) supplied with combustible (4) and combustion supporting (5) fluids. The flow rate of at least one of the fluids is pulsed at a frequency comprised between 0.1 and 3 Hz. There is provided in the furnace (1) at least one pair of two burners (2A, 2B; 3A, 3B) disposed substantially confronting each other; and the fluid of the burners of a pair is pulsed in offset phase from one burner to the other. The frequency of pulsation is between 0.1 and 1 Hz. The flow rates of fluids are substantially identical for each burner (2A, 2B; 3A, 3B) of the pair. The power of the pair of burners is greater than 300 KW.

Abstract: A gas burner comprising a housing with a front exit, a back surface, and an outer surface. The housing has a closed back surface at one end and an open exit at the other end. The housing is separated into a fuel-oxygen mixing chamber and a second chamber by a support plate. A multiplicity of jets passing through the support plate such that the fuel-oxygen mixing chamber is in communication with the second chamber through the jets. The fuel-oxygen mixing chamber has an inlet for a first-gas, usually a fuel gas, and an exit. The second chamber has an inlet for a second-gas, usually oxygen. The jets arranged such that each jet centerline is unique with respect to all other jet centerlines and each jet centerline is directed from the support plate to the housing exit.

Abstract: A burner system for a furnace includes horizontal rows of cell burners some of which contain a secondary air port vertically spaced from a coal nozzle. The cell burners are in the front and rear walls of the furnace. Near the side walls of the furnace, which are connected between the front and rear walls, additional double-burner cells are provided which include a pair of vertically spaced coal nozzles or burners. Either a single lower row or a lower and upper row of cell burners include the double-burner cells at the side walls. The double cell burners are operated at 1.0 or higher throat stoichiometry. This reduces corrosion at the side walls while only slightly increasing NO.sub.x emission.

Abstract: A two stage rapid mix burner provides apparatus and method which significantly reduce the burner size of a rapid mix burner, and/or the burner pressure drop, while maintaining the rapid mix feature and stability of the basic rapid mix design. The burner can also be easily altered to fit in non-circular geometries, such as a corner or tangential fired boiler. The invention uses a circular basic rapid mix burner located internally of a larger burner which can be non-circular. The inner burner provides the flow of hot gases which stabilizes the outer burner. In effect, the combustion gases produced in the inner burner replace the strong internal recirculation flow generated by the basic RMB as an ignition source for the outer burner flow.

Abstract: The invention relates to a combustor, such as a burner or a cylinder of an engine with internal combustion, where combustion fluid passing through a slit (2,3; 6,7; 8,9; 11,12; 21,23; 31; 36,37; 39; 45; 48,49; 54; 61; 70,71,73,78; 96'; 109,110; 81; 124; 128), which may be straight as well as ring-shaped, is ignited in a space which allows for the development of turbulence. Said development of turbulence is caused by providing that bD/.nu.>1000, and preferably >2000, where b represents the width of the slit, D the distance between two consecutive slits or the width of the space and .nu. the kinematic viscosity of the supplied combustion air. In accordance with further embodiments of the invention, guiding members are placed to sustain said turbulences and/or to feed combustion gases back to the ejected peel-shaped jet. Thus a very low NOx value is obtained and it is likewise possible to construct a stable burner with a very wide adjustment range.

Abstract: A secondary air distribution for a furnace in which an housing is provided for receiving air and a set of dividers are located in the housing for dividing the air passing through the housing into a plurality of streams. A set of dampers are disposed in the housing and are located relative to the dividers for controlling the flow of each of said streams. Additional dividers are provided for splitting each of the streams of air flow and an additional set of dampers are disposed in the housing and are positioned relative to the additional dividers for controlling the flow of each of the split stream portions to the modules.

Abstract: A gas burner particularly intended to produce diffusion flames of good emissivity and luminosity in an industrial furnace, for example a reverberation furnace such as may be used in glass making. The burner has a plate forming a burner nozzle having a central through first bore surrounded by a circular array of six smaller diameter second bores. One of the second bores is parallel with the axis of the central first bore. Whereas the other five second bores are each respectively disposed at an acute angle of substantially 22.5.degree. to the axis of the central first bore. Fuel gas is supplied to the central first bore through a central tube and to the second bores through an annular passage between the central tube and a surrounding tube.

Abstract: Improved methods and burner apparatus are provided for discharging mixtures of fuel and air into furnace spaces wherein said mixtures are burned and flue gases having low NO.sub.x content are formed therefrom. The methods basically comprise discharging a first fuel mixture containing a portion of the fuel and flue gases from the furnace space into the furnace space whereby the mixture is burned in a primary reaction zone therein and flue gases having low NO.sub.x content are formed therefrom, and then discharging the remaining portion of the fuel into a secondary reaction zone wherein the remaining portion of fuel mixes with air and flue gases to form a second fuel mixture which is burned in the secondary reaction zone and additional flue gases having low NO.sub.x content are formed therefrom.

Abstract: A low NO.sub.x burner includes a burner plate having a plurality of slots from which fuel gas jets and combustion air are discharged. A plurality of fuel tubes are aligned with the slots for discharging the fuel gas therethrough. The fuel tubes are spaced from the slots so that combustion air, provided by a wind box, also can flow through the slots. The fuel gas and combustion air are discharged at high velocity, thereby generating very high turbulence in the combustion chamber downstream from the burner. The slots are arranged such that the width of the recirculation zones between adjacent slots substantially varies between the central region of the burner plate and its perimeter. With this construction, the local ignition patterns vary such that local oscillations of flame front occur at different frequencies and are not synchronized so that vibrations are greatly dampened and resonance problems in the furnace minimized or eliminated.

Abstract: In a low NOx burner, oil and gas are distributed into the combustion zone from within a central tube, surrounded by an outer tube to define an annular channel between the central tube and the outer tube. A windbox surrounds the inner and outer tubes to introduce air into the annular channel and through openings in the inner tube into the central tube. The central tube and outer tube are sized so that the velocity of air through the outer tube is substantially greater than the velocity of air flow through the inner tube to the combustion zone so that an axial recirculating air flow is generated in the combustion zone. The difference in the velocity of the air streams is maintained small enough so that minimum turbulence is generated in the combustion. The air flow paths are constructed so that no angular rotation in the air flow occurs in the combustion zone.

Abstract: Improved methods and burner apparatus are provided for discharging mixtures of fuel and air into furnace spaces wherein said mixtures are burned and flue gases having low NO.sub.x content are formed therefrom. The methods basically comprise discharging a first fuel mixture containing a portion of the fuel and flue gases from the furnace space into the furnace space whereby the mixture is burned in a primary reaction zone therein and flue gases having low NO.sub.x content are formed therefrom, and then discharging the remaining portion of the fuel into a secondary reaction zone wherein the remaining portion of fuel mixes with air and flue gases to form a second fuel mixture which is burned in the secondary reaction zone and additional flue gases having low NO.sub.x content are formed therefrom.

Abstract: A low NO.sub.x burner system for a furnace having spaced apart front and rear walls, comprises a double row of cell burners on each of the front and rear walls. Each cell burner is either of the inverted type with a secondary air nozzle spaced vertically below a coal nozzle, or the non-inverted type where the coal nozzle is below the secondary air port. The inverted and non-inverted cells alternate or are provided in other specified patterns at least in the lower row of cells. A small percentage of the total air can be also provided through the hopper or hopper throat forming the bottom of the furnace, or through the boiler hopper side walls. A shallow angle impeller design also advances the purpose of the invention which is to reduce CO and H.sub.2 S admissions while maintaining low NO.sub.x generation.

Abstract: This invention relates to a process for exploitation of a burner and to a burner for rotary tubular furnaces, wherein fuels and primary combustion air are supplied concentrically and the burner comprises a burner nozzle which comprises concentric supply conduits for the fuel and for the primary combustion air in the form of axial air and eddying air. In order to procure a process and burner which may operate with a smaller proportion of primary air and a greater range of adjustment, a dead zone is provided at the center of the flame directly all around a central fuel conduit and within an annular fuel supply conduit, in which a very small proportion of fuel is sent.

Abstract: A combustor for a gas turbine engine includes divergent mixing cones disposed substantially within the combustion chamber proper to provide a flow restriction which separates the combustion chamber into primary and secondary combustion zones. Placement of the mixing cones within the chamber enhances vaporization of the fuel and permits combustion to take place in the primary zone at flame temperatures below the stoichiometric temperature thereby reducing formation of nitrous oxides. The mixing cones have external cooling shrouds to prevent autoignition, and the mixing cones for the primary zone provide tangential swirl of the vaporized fuel/air charge in a direction opposite that of the secondary mixing cones. The mixing cones together with an associate fuel nozzle sub-assembly form an integrated unit separable from the combustor for calibration and setting of the fuel/air ratio.

Abstract: Improved methods and burner apparatus are provided for discharging mixtures of fuel and air into furnace spaces wherein said mixtures are burned and flue gases having low NO.sub.x content are formed therefrom. The methods basically comprise discharging a first fuel mixture containing a portion of the fuel and flue gases from the furnace space into the furnace space whereby the mixture is burned in a primary reaction zone therein and flue gases having low NO.sub.x content are formed therefrom, and then discharging the remaining portion of the fuel into a secondary reaction zone wherein the remaining portion of fuel mixes with air and flue gases to form a second fuel mixture which is burned in the secondary reaction zone and additional flue gases having low NO.sub.x content are formed therefrom.

Abstract: A burner apparatus having particular advantage for use with rotary kilns of the type used to process cement, lime, and the like, provides adjustable flame geometry and location within the combustion zone. Either gaseous or liquid fuels can be fired with highly selective heat flux as required for processing. Air and gaseous fuel injection means are controllable to vary the velocity of injection and thereby alter flame geometry. This is achieved by disposing an axially-adjustable control baffle in a crossectional area of changing transition section formed by coaxial members, between which an air supply conduit is formed. The control baffle is cylindrical and fits in and moves within the air supply conduit. The transition section has frustoconical surfaces opposite frustoconical surfaces on the control baffle so that different gaseous mass flow can be regulated around a central flame resulting in an adjustable flame geometry.

Abstract: A gas/air mixing valve is provided for regulating the amounts of combustion air and fuel gas that are delivered to a burner or a series of burners for use with both residential and commerical cooking ranges. The mixing valve overcomes the problem of pressure disturbances caused by known mixing valves by drawing a constant flow of combustion air regardless of whether the burner to which it is supplying fuel gas and air is off or operating at any intensity level. In a preferred embodiment the mixing valve is provided with an adjustable orifice disk which directs a constant flow or air, in selectable proportions, to either combine in the mixing valve with fuel gas for combustion or bleed to atmosphere. By always drawing a constant flow of air independently of the operating level of the burner, the mixing valve allows adjustment of individual burners with no effect on other burners connected to the system.

Abstract: A burner assembly (75) for the combustion of liquid fuels in furnaces (12) and the like. The assembly comprises fuel gun means (78) for creating a mixture of combustible fuel and an atomizing medium and injecting a stream of the mixture into the interior of a furnace; housing means (76) supporting the fuel gun means, attachable to the furnace, so that the combustible fuel mixture is delivered to the interior of the furnace for combustion and for supplying a first flow of air (B) into the furnace separate from the air mixed with the fuel to encompass the injected fuel mixture; and sirler means (79) having a plurality of blades (94) interposed within the housing means so that the first flow moves around and through the blades for imparting a rotation to the first flow of air to break up the stream of fuel mixture.

Abstract: A furnace and burner construction and method of burning fuel therein. The furnace housing has an end wall and side walls extending generally perpendicularly from the end wall and defining a furnace interior. One or more air supply ports open axially thereof through the end wall, and at least one fuel supply port opens axially thereof through the end wall and is spaced from the air supply port or ports. The air supply port is spaced from the side walls. When generally conical surfaces of jets of fuel and air are injected into the interior of the furnace through the air supply port or ports and the fuel supply port for carrying out burning of the fuel, recirculating currents of combustion products from the burning of the fuel are formed in the space between the jets and the side walls or between the jets themselves to lower the temperature of the burning.

Abstract: A method and system are disclosed for providing fuel and air to a furnace. The furnace includes a plurality of burner assemblies, each with its own air valve for controlling the flow of combustion air therethrough. A sensing instrument for each burner assembly senses a condition reflecting the individual performance of that particular, separate burner assembly. A controller is coupled with the sensing instruments and with the air valves of the burner assemblies for controlling each individual air valve in response to the performance reflecting condition sensed by each sensing instrument. This results in individual control of the performance of each burner assembly of the set of burner assemblies feeding fuel and air to the furnace.

Abstract: A method of combusting fuel in a furnace having a pair of regenerative burners, each burner having a combustion chamber and a regenerative bed having an exhaust means incorporated therewith introducing simultaneously into said combustion chamber of each burner approximately identical amounts of fuel and approximately identical amounts of oxidizing gases from at least two sources of oxidizing gases having different oxygen concentration to produce two approximately identical flame patterns directed toward the interior of said furnace; terminating the supply of fuel and said oxidizing gases to one of said burners to create a non-firing burner having a non-firing period while maintaining the production of a flame in the remaining burner to create a firing burner having a firing period; applying negative pressure to the exhaust end of the regenerative bed of said non-firing burner to initiate the exhausting of flue gases produced by said firing burner; alternating the introduction of fuel and at least one oxidizin

Abstract: A low NOx burner comprises a pulverized coal nozzle for injecting a flow of a mixture of pulverized coal with primary air, a secondary air nozzle arranged externally of and coaxially with the pulverized coal nozzle, a tertiary air nozzle arranged externally of the secondary air nozzle and disposed coaxially with the pulverized coal nozzle, and a swirl flow generator for injecting secondary air and tertiary air as a respective swirl flow. Between the secondary air nozzle and the tertiary air nozzle, there is provided a spacer having such a thickness as to delay the mixing of the secondary air and the tertiary air and to form a swirl flow between the secondary air and the tertiary air.

Abstract: A burner for burning liquid or gaseous fuels, especially heavy heating oil. A central fuel lance is surrounded by two annular channels that supply primary and secondary combustion air. The annular channels are surrounded by several outer fuel lances that are distributed along the arc of a circle and can optionally be displaced axially and by air nozzles that convey tertiary combustion air. The object is to burn fuel at a low output of pollutants in systems with a narrow combustion space. The burner has an annular flue-gas channel between the outer annular channel and the air nozzles. The burner opens into a chamber that is jacketed in ceramic and that a heat exchanger (flame tube) extends out of. Other nozzles that convey a component of the flow of tertiary air are mounted in the wall of the chamber.

Abstract: An atomizer including a fuel supply passage for supplying a fuel, an atomizing medium supply passage for supplying an atomizing medium which is to be mixed with the fuel, a mixing chamber in communication with the fuel supply passage and the atomizing medium supply passage, and spray ports for spraying the fluid mixture consisting of the fuel and the atomizing medium from the mixing chamber. The fuel supply passage and the atomizing medium supply passages are communicated with the mixing chamber through a pre-mixing chamber having an annular cross-section defined by a large-diameter cylindrical surface and a small-diameter cylindrical surface. The fuel and the atomizing medium supplied from the fuel supply passage and the atomizing medium supply passage are pre-mixed the pre-mixing chamber. With this arrangement, it is possible to efficiently mix a slurry fuel and an atomizing medium, thus reducing the particle size of the atomized fuel particles and shortening the flame length.

Abstract: A method of injecting burning resistant fuel into a blast furnace, which includes the steps of supplying a hot blast air having a temperature of at least 810.degree. C. into a blast furnace, injecting the burning resistant fuel into the hot blast air, and injecting a gas fuel into the hot blast air independently of injection of the burning resistant fuel. The gas fuel is supplied to an outer peripheral area of the burning resistant fuel. The injection of the gas fuel is in a proportion of at least 2% of the injection of the burning resistant fuel in terms of calorific value.

Abstract: A multi-outlet burner for heating material. Nozzles are positioned along a longitudinally extending portion of the burner that generally parallels the material surface. Combustion gas and fuel are combined at each nozzle to produce a plurality of flames that are directed in a sweeping direction over the surface.

Abstract: An adapter to permit an oil burner head to burn pulverized coal alone or in combination with other fuels features a manifold in the form of a mirrored pair of scrolls forming a part of the burner head. The interiors of the scrolls are divided into separate coal and air passages which open into the primary air passage of the burner head through outlets uniformly circularly disposed thereabout.

Abstract: A different fuels combustion burner for simultaneously burning a liquid fuel and a solid fuel in which the solid- and liquid-fuel injections are separated in the circumferential direction so that the interference between the injected solid and liquid fuels can be avoided.

Abstract: A gas burner formed of an elongated combustion chamber having a fire wall at one end, an ignition tube extending through an opening in the fire wall, a conductive member within the ignition tube providing means for generating ignition sparks adjacent the end of the tube within the combustion chamber, a plurality of axially directed jet members positioned in the openings in the fire wall and extending into the combustion chamber, a mixing chamber rearwardly of the fire wall having separate fuel and air mixture inlets, a tubular partition within the mixing chamber, air being received on the outside of the tubular partition and gas on the inside and a plurality of secondary air jets extending through openings in the fire wall, each of the secondary discharge jets being configured to discharge air into the combustion chamber in directions tangent to the direction of discharge of the axial jet members so that a column of moving secondary air surrounds the flame of combustion within the combustion chamber.

Abstract: Modified Claus furnace containing, in addition to primary reaction chamber, a secondary chamber in heat exchange with said primary reaction chamber wherein H.sub.2 S is cracked to supply hydrogen needed downstream in a clean-up system. This eliminates the need for supplemental hydrogen generator now usually provided for in a sulfur recovery system. A catalyst such as cobalt-molybdenum can be used in the secondary reaction chamber.

Abstract: A method and burner tip for suppressing the production of oxides of nitrogen when burning a fuel in a combustion chamber containing a flame zone are described. The burner tip comprises at least one port for introducing fuel into the combustion zone and at least one port for introducing a control gas into the combustion zone, where both the fuel and control gas are introduced substantially perpendicular to the direction of introduction of combustion gas into the combustion zone. The ports are laterally spaced apart from each other. The control gas is used for controlled localized quenching of the flame zone and/or for controlled atomization of the fuel in the case of a liquid fuel to reduce the emissions of nitrogen oxides (NOx). By proper selection of the size and location of the fuel and control gas ports, and the quantity and velocity of the fuel and control gas introduced into the combustion zone, a stable flame with minimal emission of oxides of nitrogen can be obtained.

Abstract: The invention relates to a method and device for the combustion of corrosive products, such as chlorine containing residues, comprising a combustion chamber, a dispersing head having an axial inlet for the phase to be burnt, and means for introducing two separate fractions of the combustive phase, and a plate for connecting the dispersing head to the combustion chamber.

Abstract: A method comprising injecting a primary fuel and air into a furnace to burn the fuel and form a first-stage combustion zone, the air being supplied at a rate in excess of the stoichiometric rate required for the combustion of the fuel, and injecting a secondary fuel into the furnace around or downstream of the first-stage zone at a rate approximately equal to the stoichiometric rate required for the consumption of the excess oxygen resulting from the combustion in the first-stage zone the fuel being diluted with the surrounding combustion gas and to form a second-stage combustion zone around or downstream of the first-stage zone.

Abstract: In a method for the ignition of a fuel dust power burner, in which the ignition energy is provided by a fuel dust pilot burner, for example for the ignition of a coal dust burner with a coal dust igniting flame, the ignition performance of the igniting flame is not adequate in some cases. In order to increase the ignition performance, so as also to be able to ignite the flames of high-powered power burners, it is proposed that, after ignition of the igniting flame to which coal dust and air are supplied by respective tube, a mixture of additional igniting coal dust supplied by way of a further tube and air is conducted to this flame by way of the power fuel dust tube, and then the power fuel dust is supplied along the power fuel dust tube.

Abstract: There is disclosed in a ceramic burner comprising a base, a crown disposed on an opposing end to said base and therebetween a housing defining a combustion chamber, a first conduit entering said housing and communicating therein with a gas chamber in turn communicating with a gas passage running longitudinally therethrough, a second conduit entering said housing and communicating therein with an air chamber in turn communicating with an air passage running therethrough, said gas passage and said air passage juxtaposed to one another, each having an elongated cross section, said gas passage and said air passage being vertically supported from one another, said gas passage and said air passage being in communication with said crown the improvement wherein between said gas passage and said air passage there is disposed at least one gas slot and at least one air slot extending from said base to said crown, said gas slot and said air slot being closed off from said gas passage, said air passage, said gas chamber a

Abstract: A pair of burner tubes are arranged in concentric relationship. Fuel and air in a rich fuel-air ratio is provided to the central burner tube, and fuel and air in a lean fuel-air ratio is provided to the outer burner tube. The rich combination of fuel and air is partially burned at a temperature of about 2,500.degree. F. while the lean combination of fuel and air is burned at a temperature of less than 2,800.degree. F., and the flames from the burner tubes are mixed at the ends of the burner tubes to form a final flame envelope and to finish the combustion of the rich mixture. Exhaust gas is directed about the burner tubes, and combustion supply air is circulated about and preheated by the exhaust gas conduits and the outer burner tube. The separate combustion of the rich and lean fuel-air mixtures at relatively low temperatures and the subsequent mixing of the flames from the burner tubes results in low NOx emissions and results in high luminosity of the final flame envelope.

Abstract: A ceramic burner for gas, for a combustion chamber of a hot-blast stove of a blast furnace, has parallel vertical supply ducts for the two combustion components (gas and air). A first one of said ducts opens upwardly at a first outlet which is substantially oblong in plan view and the second of said ducts opens at a plurality of second outlets which are located on either side of and above the first outlet, the general discharge directions of the second outlets being oblique to that of the first outlet. In order to provide improvement in the mixing and homogenisation of the combustion components, the first outlet has, as seen in plan view, a slot shape and has, in its long sides, a plurality of recesses which extend outwardly towards the second outlets. The second outlets are arranged alongside the said long sides of the first outlet with the second outlets on one side opposite those on the other side.

Abstract: The present invention resides in a dual fueled burner gun providing reduced production of oxides of nitrogen. The gun operates in a gaseous fueled mode when it is charged with a gaseous fuel or in a liquid fueled mode when it is charged with a liquid fuel. The gun may also operate in a gaseous/liquid fueled mode in which it is charged with both the gaseous and liquid fuels.