Abstract: A toxic waste incinerator is capable of enhanced combustion of hazardous waste (oil contaminated sand, human waste, garbage, etc.) utilizing immersed non-combustible and thermally conductive objects for increasing heat feedback from the flames to the unburned fuel, while air inlets are used to optimize the air entrainment rate to enhance the burning efficiency. The burning rate of a fluidic mass such as a sand-oil mixture is enhanced using immersed conductive objects (copper rods) which enable rapid heat-up of the flame exposed to the upper surface of the rod and transmits heat back into the sand. Consequent conduction of heat to the porous media through the lower portion of the immersed rod significantly increases vaporization and therefore the burning rate. Incineration may be performed on a transient, exigent basis as with hazardous waste and oil spills, or as part of a permanent fixture for receiving an ongoing waste stream.

Abstract: To substantially reduce inequality in hot combustion flow rates through first and second heat exchanger tubes from a fuel-fired heating appliance burner box connected thereto and internally combusting a fuel/air mixture received therein from a source thereof to create the hot combustion gas, a perforated diffuser member having a non-uniform perforation pattern is provided. The fuel/air mixture is flowed through the perforated diffuser member into the interior of the burner box. The non-uniform perforation pattern of the diffuser member functions to alter relative combustion gas flow rates through the first and second heat exchanger tubes in a manner reducing an undesirable operating temperature differential therebetween.

Abstract: A dual phase fuel feeder is disclosed that can be used to provide both solid fuels and liquid fuels to a boiler, such as a fluidized bed boiler. The fuel feeder includes a sloped chute which defines a solid feedpath. Gas distribution nozzles are located at the base of the fuel feeder, and secondary nozzles are located so as to be able to distribute a liquid or particulate fuel into the solid feedpath. This permits the liquid fuel to contact the solid fuel and be carried into the fluidized bed instead of becoming suspended above the bed.

Abstract: A burner includes a generally cylindrical reactor chamber (1) including a housing (1?) having a proximal end (1p) and a distal end (1d). In the distal end of the reactor chamber (1) there is provided a catalyst (4). A fuel inlet (7) is provided in the proximal end of the reactor chamber. There are also a plurality of air inlets (22, 23; 24) arranged in the reactor wall at the proximal end. The inlets are configured to provide a rotating flow of the air injected into the reactor chamber. There is also provided a flow homogenizer (8; 30) extending over the cross-section of the reactor chamber at a position between the fuel inlet (7) and the catalyst (4).

Abstract: A nitrogen oxide reduction baffle for a heat exchanger of a furnace and a gas furnace incorporating at least one such baffle. In one embodiment, the baffle includes: (1) a body having a predetermined length, cross-sectional configuration and longitudinal slot, the longitudinal slot having a predetermined width and position and (2) a locating structure coupled to the body and configured to place the body in a predetermined longitudinal location within a heat exchanger and orient the slot relative to the heat exchanger, the body laterally constrained within the heat exchanger when the body is located at the predetermined longitudinal location.

Abstract: A method for producing a fuel nozzle is provided. In the method a swirl duct is mounted in an outer jacket surface of a pin and/or in an inner surface of a sleeve and the pin is attached in the sleeve so that the outer jacket surface of the pin is connected to the inner surface wherein the pin is disposed in the sleeve. The outer jacket surface of the pin and/or the inner surface of the sleeve includes at least one-swirl duct. A fuel nozzle and a burner are also further disclosed wherein the burner includes the fuel nozzle.

Abstract: Premix furnace for heating an occupied space while producing lower NOx emissions and methods of mixing air and fuel delivered to a premix burner and of improving combustion stability. A mixing device may be located within an inlet tube, may have a flat surface that is perpendicular to the direction of fuel flow, or may have two surfaces held at substantially opposite angles to induce swirl. A mixing device may be attached to the fuel injector, may be made from a piece of sheet metal, and may have bends and a hole for attachment to the fuel injector. A fluidic diode in the inlet tube may improve combustion stability and may include a hollow frustum or a frustoconical portion, a cylinder concentric with the inlet tube, or a combination thereof. Some embodiments include refractory insulation lining the combustion chamber or may adjust for elevation or fuel characteristics.

Abstract: A dual fuel vent free gas heater having at least one gas burner with a plurality of gas outlet ports. The gas outlet ports are in flow communication with at least one pilot flame burner. At least one fuel injector feeds fuel to the burner providing for introduction of more than one fuel to the burner. Optionally, an oxygen detection system, manual control valve, linkage, and/or shut off control system may be incorporated into the dual fuel vent free heater.

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 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: The invention relates to a burner for a turbomachine, comprising a guide plate that is arranged in a flame chamber and engages a wall section via spacers. The invention further relates to a guide plate, the fastening section of which comprises a plurality of raised areas for fastening to a wall section of a flame chamber. The invention further relates to a turbomachine having a burner of said kind.

Abstract: A burner for a heater, especially for use in motor vehicles, with a burner nozzle (12) for supplying and atomizing of fuel, which has a fuel needle (14) for supplying fuel to the burner (10) and a combustion air supply (16) for supplying combustion air to the burner, and a starting zone (18) in which ignition of the fuel to start the burner takes place. It is provided that, by choosing the inside diameter of the fuel needle (14) the exit speed of the fuel is predetermined such that, during the starting phase of the burner (10), fuel in essentially unatomized form reaches the starting zone (18).

Abstract: A burner (10) for a heater, especially for use in motor vehicles, with a burner nozzle (12) for supplying of fuel and primary air, a combustion chamber (22), and a heat shield (24) between the burner nozzle and the combustion chamber, the heat shield having openings (26) for supplying secondary air to the combustion chamber. The openings (26) are equipped with air guide elements (28, 30).

Abstract: A burner (10) for a heater, especially for use in motor vehicles, with an essentially axially symmetrical combustion chamber (22) and a baffle plate (36) which is located in the combustion chamber. The baffle plate (36) has a defined curvature in an axial direction and that there is a curvature in the direction of the burnout zone (32). An outer periphery of the baffle plate defines a plane and a maximum axial distance of the baffle plate from this plane Dm and the diameter of the baffle plate Bd have dimensions that have a ratio Dm:Bd relative to each other that is between 0.07 and 0.21.

Abstract: A burner for a heater, especially for motor vehicles, has an essentially axially symmetrical combustion chamber, a burner nozzle for supply and atomization of fuel, a fuel needle for supplying fuel to the combustion chamber, a combustion air supply for supplying combustion air to the combustion chamber, a starting zone in which ignition of the fuel to start the burner takes place, a heat shield between the burner nozzle and the combustion chamber, the heat shield having openings for supplying secondary air to the combustion chamber, and a baffle plate located in the combustion chamber. By choosing the inside diameter of the fuel needle, the exit speed of the fuel is predetermined such that, during the starting phase of the burner; fuel in essentially unatomized form reaches the starting zone. The openings have air guide elements, and the baffle plate has a defined curvature in the axial direction.

Abstract: A baffle for a regenerative burner has a primary reactant port, secondary reactant ports, and internal flow paths. The primary port is centered on an axis. The secondary ports are arranged in an array that is asymmetrical relative to a plane containing the axis. The internal air flow paths convey secondary air streams from the regenerative bed to the secondary ports. A reactant delivery structure for use with the baffle includes a pilot burner, a main fuel conduit, and a primary air conduit. The pilot burner projects a pilot flame toward the primary port. The main fuel conduit has an annular outlet that directs a main fuel stream over the pilot flame and outward from the primary port. The primary air conduit has an annular outlet that directs a primary air stream outward from the primary port over the main fuel stream.

Abstract: Tertiary nozzle of port for gas injection into furnace includes a contracted flow producing channel provided obliquely toward central axis from the upstream side of gas flow so that the gas flow has a velocity component heading from the outer circumferential side of the port toward the central axis and a velocity component heading along the central axis toward the interior of the furnace, and including louver disposed for guiding so that the gas flows along the surface of throat wall of enlarged pipe configuration wherein the gas channel is enlarged at a furnace wall opening disposed at an outlet area of the contracted flow producing channel.

Abstract: A method for combusting a combustible fuel includes providing a vessel having an opening near a proximate end and a closed distal end defining a combustion chamber. A combustible reactants mixture is presented into the combustion chamber. The combustible reactants mixture is ignited creating a flame and combustion products. The closed end of the combustion chamber is utilized for directing combustion products toward the opening of the combustion chamber creating a reverse flow of combustion products within the combustion chamber. The reverse flow of combustion products is intermixed with combustible reactants mixture to maintain the flame.

Abstract: A combustion apparatus 2 has an anti-spreading member 65 disposed below a combustion chamber 10. This anti-spreading member 65 is composed of a generally cylindrical main body 65a, an outer flange 65b and an inner flange 65c, these flanges being formed at and integral with the opposite ends of the main body 65a, respectively. A controller 40 for regulating the operation of this apparatus 2 is designed to preheat the anti-spreading member 65 at a heat generation rate ‘q’ lower than the required heat generation rate ‘Q’, before the apparatus starts its normal operation to burn a fuel.

Abstract: The invention relates to a method an apparatus for atomizing liquids. In particular, the present invention relates to a method and apparatus for atomizing heavy hydrocarbon fuels such as diesel, as part of a fuel reforming process. During normal operating conditions the fuel is atomized by a high pressure fluid. Under start-up conditions when only a low pressure gas is available the fuel films across part of the nozzle and is subsequently atomized by a radially directed low pressure dispersion gas.

Abstract: In a burner (10) for the production of a hot gas, which burner (10) opens with a burner outlet (22) edged with an outlet edge (16, 17) into a combustion chamber (23), in which a fuel-air mixture flowing out from the burner outlet (22) with the formation of an outflow boundary layer (18′) forms a flame (20) after the ignition of the burner (10), the combustion process is improved in that, to prevent periodic releases of heat and the therewith connected thermoacoustic oscillations in the combustion chamber (23), means (21) are arranged at the burner outlet (22) for changing the thickness of the outflow boundary layer (18′).

Abstract: A combustion apparatus 2 has an anti-spreading member 65 disposed below a combustion chamber 10. This anti-spreading member 65 is composed of a generally cylindrical main body 65a, an outer flange 65b and an inner flange 65c, these flanges being formed at and integral with the opposite ends of the main body 65a, respectively. A controller 40 for regulating the operation of this apparatus 2 is designed to preheat the anti-spreading member 65 at a heat generation rate ‘q’ lower than the required heat generation rate ‘Q’, before the apparatus starts its normal operation to burn a fuel.

Abstract: Apparatus (10) for recovering fumes from a roofing kettle (12) includes a fan (72) for drawing air from the hollow interior of a housing (20). A conduit (34) extends through the housing front wall (22) and terminates in the hollow interior. A burner assembly (44) is disposed within the conduit (34) for providing a flame within the conduit (34). The housing side wall (30) includes a fresh air intake (78). A flexible metal hose (80) extends between the outer free end of the conduit (34) and the roofing kettle (12). Rotation of the fan (72) causes air to be drawn from the interior of the housing (20) and in turn through the fresh air intake (78), through the conduit (34) and the hose (80) from the interior of the kettle (12), and through the duct (46) and tube (58) of the burner assembly (44).

Abstract: A process atmosphere incinerator for neutralizing chemical non-innocent gaseous mixtures uses thermally induced neutralization reactions, and does not rely on the use of auxiliary components. In these reactions, chemical non-innocent gaseous mixtures are neutralized to form benign and environmentally friendly products. A plurality of flame breakers is disposed inside of the reaction chamber of the process atmosphere incinerator. The flame breakers introduce variations in gas flow paths and flame patterns, and provide surfaces of elevated temperature inside the reaction chamber. The process atmosphere incinerator is constructed in a way as to support neutralization of a wide range of amounts of non-innocent gaseous mixtures of arbitrary composition.

Abstract: A conveyor oven is heated by inshot burners, which eliminate blowers, ducts, and motors heretofore required to supply a force draft of combustion air to the burners. Apertures in front of the inshot burners have a diameter that regulates the amount of combustion air that is delivered to the burners. The only blower in the oven is the one required to circulate and recirculate hot air within the oven which produces three pressure zones that causes an induced draft of combustion air for the inshot burner. A modulating valve adjusts the flow of gas to the inshot burners.

Abstract: Low NOx axial premix burner apparatus and methods for burning fuel gas are provided by the present invention. The methods of the invention are basically comprised of the steps of mixing a first portion of the fuel gas and all of the air to form a lean primary fuel gas-air mixture, discharging the lean primary fuel gas-air mixture into the furnace space whereby the mixture is burned in a primary combustion zone therein, discharging a second portion of the fuel gas into the primary combustion zone to stabilize the flame produced therein and discharging the remaining portion of the fuel gas into a secondary combustion zone in the furnace space.

Abstract: Apparatus (10) for recovering fumes from a roofing kettle (12) includes a fan (72) for drawing air from the hollow interior of a housing (20). A conduit (34) extends through the housing front wall (22) and terminates in the hollow interior. A burner assembly (44) is disposed within the conduit (34) for providing a flame within the conduit (34). The housing side wall (30) includes a fresh air intake (78). A flexible metal hose (80) extends between the outer free end of the conduit (34) and the roofing kettle (12). Rotation of the fan (72) causes air to be drawn from the interior of the housing (20) and in turn through the fresh air intake (78), through the conduit (34) and the hose (80) from the interior of the kettle (12), and through the duct (46) and tube (58) of the burner assembly (44).

Abstract: The technical field of the invention is that of making “in-stream” burners which are placed directly inside a duct carrying a flow of gas, with the burners serving to heat the gas and being placed as burner rails that are generally made up of individual blocks. Such burners comprising a pipe on an axis XX′ and suitable for extending transversely across the flow direction of the gas, the pipe being fed with a fuel gas and being pierced by at least two holes in alignment on a common generator line, the burner also having a flame stabilizer formed by two deflector-forming fins diverging on either side of the generator line. According to the invention, at least one of the holes is extended by a tube extending beyond the outer edges of the fins and pierced by at least one fuel gas ejection orifice at its distal end.

Abstract: A device for burning vented fuel has a housing defining and substantially enclosing a combustion chamber. The housing has an air inlet, a vented fuel inlet, and an exhaust gas outlet. A manifold burner is disposed in the combustion chamber and conveys the vented fuel into the combustion chamber. An ignition device is disposed in the chamber for igniting the vented fuel. The manifold burner and exhaust gas outlet define a direct exhaust gas path extending linearly from the manifold burner to the exhaust gas outlet. A deflection shield is disposed in the direct exhaust gas path, and is sized at least as large as the approximate size of the exhaust gas outlet, for substantially deflecting exhaust gas and heat produced by the combustion of vented fuel away from the exhaust gas outlet. The deflection shield is displaced from the exhaust gas outlet to create a gap for allowing exhaust gas to escape the combustion chamber along a nonlinear path.

Abstract: A burner assembly for a multi-fuel stove includes a nozzle that is vertically oriented during operation of the stove wherein the nozzle is connected to a number of flanges that extend along and in directions away from the nozzle and have upper portions extending up to a level that is above the nozzle and have channels formed between them for the passage of gas. By this arrangement, different fuels including petrol to photogen and even fuels with higher vaporization temperatures can be effectively vaporized and burned.

Abstract: An apparatus is provided for suppressing flame/pressure pulsations in a furnace, in which a flame is surrounded by a gas shroud stream having a higher flow speed, whereby a ring vortex formation is stopped. In order for this gas shroud stream to be able to achieve smaller gas volumes, a screen is provided that surrounds the gas outlet openings and runs at a spacing around the burner, so that a flue gas recirculation area associated with the combustion chamber is separated from the outlet location of the gas shroud stream and thus the gas shroud stream itself.

Abstract: A burner is disclosed, comprising: a burner body and a burner lid coupled to the burner body so as to form a plurality of gas ports in a substantially circular and substantially planar arrangement, said gas ports being interposed between the burner body and the burner lid and adapted to have a corresponding array of flames extending from the gas ports during combustion of a fuel gas.

Abstract: An improved high-efficiency furnace for use with manufactured housing has a modular heat exchanger assembly having a drum and a plurality of serpentine shaped tubes. A burner extends at least partially into the drum portion of the heat exchanger which acts as a combustion chamber. Hot combustion gases flow upwardly within the drum and enter the tubes heating the drum and tubes. Room air is drawn into the furnace by a circulating blower and blown against the plurality of tubes. The room air is then directed to flow around the drum portion of the heat exchanger where it is further heated before being discharged into the space being heated. The burner includes an inwardly tilted target plate having a plurality of fingers for facilitating the formation of a stable ball of flame within the drum.

Abstract: A kiln for baking ceramic materials includes a plurality of burners arranged along the conveyor surface so as to heat the internal volume of the kiln. The kiln includes a deflector which is arranged along the path of the flame that exits from at least one of the burners, so that the path of the flame is diverted with respect to a straight free path, achieving diffusion of the flame in the intended direction.

Abstract: In a boiler plant for heat generation, which consists essentially of a combustion space and of a burner acting on the head side of the combustion space, this combustion space is divided into two parts (17,102a) by the insertion of an annular disk (103). A limited internal backflow zone (24) forms in the front part (17) in interaction with this disk (103). This disk (103) then causes external backflow zones (106) fed by recirculated flue gases (30) to form within the front part (17) of the combustion space, the flue gases of said external backflow zones being introduced into the combustion process of the burner, said backflow zones (24, 106) being in each case separated locally from one another. Better flame stabilization, lower pulsations and markedly lower pollutant emissions can thereby be achieved when the burner is operating.

Abstract: A mixing/quenching device is in the form of a perforate metal sheet or screen secured at the downstream end of a belled orifice with the perforations defining a plurality of flow paths. The dividing and combining of the flow is passing through the flow paths provides turbulence such that thermal NO.sub.x is reduced.

Abstract: The gas burner of the present invention includes a mated burner body and a burner lid. A plurality of gas ports in a substantially circular and planar arrangement are interposed between the mated body and lid and are directed radially from the body and lid. An air shield member is coformed to and extends radially from the burner body or burner lid. Extending radially from the air shield member in substantial radial alignment with the gas ports is a plurality of flame partitions equal in number to the gas ports. Each flame partition has two attached tabs which are substantially perpendicular to each other when the flame partition is observed in cross-section.

Abstract: A low NO.sub.x water heater burner including a burner body having opposed surfaces; and a multiplicity of spaced apart energy absorbing fins connected to at least one of the surfaces and positioned to absorb energy from burner flames generated by combustion of fuel, wherein flames generated by combustion of fuel proximate said fins are positioned such that the fins absorb energy from the flames, thereby lowering flame temperature and reducing NO.sub.x emissions.

Abstract: A wedge shaped form is mounted on the splash plate of a black liquor nozzle with the sharp edge of the wedge located at the exhaust of the nozzle to split the black liquor from the nozzle into two flat sheets on each side of the wedge with no droplet formation at the center of the nozzle exhaust.

Abstract: A mixing/quenching device is in the form of a stack of perforate metal sheets secured together with the perforations aligned to define continuous flow paths. The interfaces of the laminations in the flow path provides turbulence and the thermal mass of the device provides heat transfer such that thermal NO.sub.x is reduced.

Abstract: A kerosene heater (1) having a pump assembly (106) which includes a piston (113) having a hollow bore (121) through which fuel (98) is routed to the hollow shaft of a fuel atomizer (27). The piston (113) is operated by a cam (117) machined into the shaft (114) of the heater motor (22). Mounted on the motor shaft (114) between the atomizer (27) and the pump assembly (106) is a novel fan (26) combining both low pitched outer blade portions (143) and high pitched vanes (146) near the hub (136) of the fan (26). The air flow near the periphery of the fan tends to be axial while the flow near the hub (136) tends to be turbulent and of lower velocity. A series of rear heads (32,33) downstream of the atomizer (27) tends to separate cooling and combustion air while preheating a portion of the air in the region of the atomizer (27).

Abstract: Combustion apparatus comprising a combustion chamber, a forced draft mixer and burner assembly extending into the combustion chamber, the assembly including a mixing tube having an open end, an opposed closed end, and a generally cylindrical, foraminous side wall extending between the ends, and a plurality of generally circular disks supported in the tube in spaced-apart relation over the length of the tube, the diameters of the disks increasing in the direction from the open end to the closed end, a blower for supplying air to the to the open end of the mixing tube, and a heat exchanger located in the combustion chamber adjacent the mixer and burner assembly.

Abstract: A device for inhibiting NOx production is disposed in a gas furnace combustion chamber. The device includes a baffle member for dividing the combustion chamber into first and second regions. A fuel-rich mixture of gas and primary combustion air is ignited by an inshot burner and the flame is drawn into the combustion chamber by an induced draft blower along with secondary combustion air. The combustion chamber is configured such that in the first region (i.e., upstream of the baffle member) turbulent mixing of the secondary combustion air with the flame is inhibited to maintain a relatively gas-rich flame. The baffle member channels the flame and secondary combustion air into a convergent flow path and the passage of the flame and secondary combustion air over the baffle member creates turbulence, which enhances mixing between the flame and secondary combustion air in the second region of the combustion chamber (i.e., downstream of the baffle member).

Abstract: A burner entry block constructed of an assembly of a plurality of parallel layers of ceramic fiber insulation bound together with thin layers of refractory mortar sandwiched between adjacent layers, the assembly of such parallel layers forming a generally rectilinear solid assembly, having ceramic fiber layers transversing from front to back of the block and being secured to a mounting plate at their front. Said multi-layered assembly defining a transverse, front-to-back, centrally-located opening, which opening is sized to receive the output of a gas burner positioned at its front. The plate has means for securing the block to a ladle cover or like insulating cover.

Abstract: Injectors are disclosed for use in an underoxidized burner having a single or double stage internal combustion chamber for receiving gaseous or liquid fuel such as diesel for mixture with air or oxygen and subsequent ignition by a spark plug. The injector includes feed conduits or tubes for simultaneously conducting air and fuel to a mixing device having a baffle arrangement against which separately injected air and fuel impinge causing a complete air/fuel blending which is ignited, burned and exhausted. The injector may accept effluent gases for mixing with water to produce maximum hydrogen H.sub.2 from fuels. A lamina flow is produced which is folded over and reversed in direction within the combustion chamber.

Abstract: An improved two-stage combustion chamber for burning waste hydrocarbons such as crank case oil, spent motor oil, transmission fluid, lubrication dopes, and heavy bodied gear lubes. The combustion chamber is formed from a plurality of spaced apart, stacked annular rings that form a flame containment housing having superheated surfaces. The flame containment housing contains the flame of an atomizing oil burner suitable for burning the variable viscosity waste hydrocarbons. The annular rings include outer walls and inwardly extending flanges that intercept unburned fuel droplets and combustion byproducts, vaporizing the droplets and/or stimulating secondary combustion. The annular rings are removable and replaceable, and are supported in spaced-apart relation by spacers on a plurality of support rods.

Abstract: The invention concerns a fiber burner-brick 5, 13, 24, 34 with a fiber part 7, 15, 25, 35, 46, 54 made of refractory fibers. In order that the said brick be of low eight, insensitive to mechanical and thermal stresses and be characterized by fine and uniform porosity, the fiber part 7, 15, 25, 35, 46, 54 is composed of individual fiber strips 9, 10, 18, 19, 20, 21, 26, 36, 47, 55 each consisting of mutually displaceable fibers intrinsically cohesive and only by themselves, the fiber strips 9, 10, 18, 19, 20, 21, 26, 36, 47, 55 being compressed against each other by a compression system 8, 16, 27, 28, 29, 30, 31, 38, 39, 44, 45, 51.

Abstract: An abatement member for inhibiting formation of oxides of nitrogen in a gas-fired furnace by controlling peak flame temperatures and residence times at the peak flame temperatures is described. The combustion system has at least one heat exchanger conduit having a flow path therethrough and at least one gas burner for burning fuel to produce a combustion flame. The abatement member has a porous refractory body portion having at least one section which is disposed transversely to the direction of flow of gases through the conduit. In one embodiment, the abatement member is a metallic screen having a serpentine shape and positioned within the fire tube. The combustion flame is directed toward and into the inlet of a fire tube and through the screen whereby the screen absorbs thermal energy from the combustion flame at a rate which limits peak flame temperatures to levels which inhibit formation of oxides of nitrogen.

Abstract: A furnace includes a generally cylindrical combustion chamber that is open at one end for receiving a single port inshot target burner. The target burner includes a flame spreader for lowering the heat energy and temperature of the gas flame so as to reduce NO.sub.x emissions. The flame spreader includes a plurality of rods affixed to the target plate or disc.

Abstract: A furnace includes a generally cylindrical combustion chamber that is open at one end for receiving a single port inshot target burner. The combustion chamber is connected to a heat exchanger through which the combustion products are drawn by an induced draft blower. A flame retention ring is provided in the target burner to aid the flame in attaching to the outer surface of the flame retention ring and thereby improve flame lifting characteristics. Also, a frustro-conical member surrounds the end of the target burner within the combustion chamber for directing air into the combustion zone to enhance the combustion process.