Abstract: A burner system for a furnace (10) includes an in-shot burner (20) having an axially elongated tubular nozzle (40) having an inlet end (42), an outlet end (44) and a venturi transition section (46) therebetween. At least a portion of a catalyst body (50) is disposed within the outlet end (44) of the burner (40). The catalyst body (50) supports a partial oxidization catalyst operative to catalyze the fuel in the primary air/fuel mixture to intermediate combustion species, including hydrogen and carbon monoxide, thereby reducing emissions such as nitrogen oxides.

Abstract: The invention provides a radiant heater comprising a radiative heating element (15, 16); a housing (1), the underside of which is recessed to receive the radiative heating element (15, 16), the radiative heating element being disposed beneath the housing (1) such that its upper half is wholly within the recess, and at least a portion of its lower half protrudes downwardly from the recess; the recess having a heat reflective surface (5a, 5b, 5c, 6a, 6b, 6c) for reflecting heat radiation from the radiative heating element (15,16) in a downwards direction; the housing (1) having means (9) enabling the attachment thereto of a reflective skirt (19) for focusing the radiation emitted from the radiative heating element (15,16).

Abstract: A fuel/air mixture control for an induction heater having a tube-type burner includes a side-venting fuel nozzle for introducing fuel into an induction air stream entering the burner. A multi-speed blower draws combustion air into the burner and an air flow constrictor disposed proximate the fuel nozzle increases the velocity of the induction air stream proximate the fuel nozzle, increasing the volume of fuel introduced into the burner conduit. The fuel/air mixture depends upon the speed of the blower, which can be thermostatically controlled to increase speed upon sensing higher temperature combustion products, thereby maintaining a steady mass air flow and air/fuel mixture.

Abstract: A combustion apparatus provided with a burner includes a fuel injection nozzle disposed rearward of a gas passable solid and a pre-mixture region between a downstream end of the solid and the fuel injection nozzle. The gas passable solid may be of a straightener type. Air for combustion includes main air and pilot air separated from each other. The apparatus may be coupled to each end of a radiant tube. The apparatus may be provided to a direct and indirect combustion type thermal facilities.

Abstract: A regenerator burner for particular use in the heating of furnace spaces of industrial furnaces is provided. The regenerator burner includes an outer tube in which a central fuel feed arrangement is provided and a burner head which contains combustion air feed and combustion exhaust gases lead-off arrangements and from which the outer tube extends. Two regenerators each of which can be acted on with combustion air and with combustion exhaust gases are also provided. The two regenerators are arranged in two annular spaces which are coaxial to the fuel feed arrangement and are positioned radially one within the other with the annular spaces extending at least over a portion of their axial length in surrounding relation to the fuel feed arrangement in the outer tube. A nozzle mechanism being allocated to each of the two annular spaces at an end of the regenerator burner opposite the burner head. The nozzle mechanisms are operable alternately as inlet and outlet nozzles.

Abstract: A radiant tube assembly comprises a radiant tube having a burner leg, an exhaust leg and a recuperator inside the exhaust leg and in a stream of products of combustion flowing in the exhaust leg. The recuperator has an air intake port at a first end and a mixing baffle at a second, hot end. The mixing baffle causes combustion air and products of combustion to be mixed at the hot end of the recuperator and provided to the burner leg for combustion. The mixing baffle includes a flow director which increases the amount of products of combustion mixed with the combustion air. The mixing baffle can also include a dome-shaped end which extends into the stream of products of combustion for reducing turbulence of the stream of products of combustion flowing in the exhaust leg.

Abstract: With respect to a radiant tube burner to be used for heating a heating furnace or the like, to suppress the generation of NOx accompanying combustion, to make the structure thereof fit for a radiant tube burner equipment, to simplify the control of a fuel supply system and an air supply system, and to prevent the coking. Furthermore, to provide a combustion control scheme appropriate to a radiant tube burner. For these purposes, the present invention placed the respective tips of a fuel nozzle, e.g., pilot burner joint-use nozzle (11), and an air throat (13) in the end of a radiant tube (3) and moreover has a combustion air injection port (33) of the air throat (13) provided to be deviated in contact with or near to the inner circumferential wall surface of the radiant tube (3). In addition, a control device (307) for making a burner burn alternately.

Abstract: A nozzle for a recuperative radiant tube burner system is constructed to provide uniform combustion along the length of the inner tube. The nozzle includes combustion air ports disposed at compound angles and having different axial components to provide staged mixing of air and fuel. The staged mixing produces a combustible mixture along the length of the tube to produce a more uniform flame. The nozzle further has an outer wall disposed normal to the combustion air ports to improve air flow through the ports. A fuel outlet tube has relief ports for continuing fuel flow in the event that a main orifice is plugged, which may result from air pressure fluctuations in the burner system.

Abstract: A compact gas combustion furnace includes a substantially rectangular casing having an interior defined by a plurality of compartments. A draft inducer is mounted above the heat exchanger compartment to allow a multipass heat exchanger to be used while allowing the furnace to be fitted within a mobile home closet. A transition box couples the horizontally disposed inlet of the inducer and the vertically disposed outlet side of the heat exchangers. In a preferable arrangement, the furnace includes a burner assembly utilizing a plurality of burners, each having an arcuate shape in relation to a corresponding plurality of heat exchangers, and thereby occupying a minimum of space without loss of efficiency.

Abstract: A recuperator of simple design constructed from a hollow tube. A penetrating tube is formed of a hollow tube, preferably of stainless steel, closed at one end and open at the other end. The open end is cut and welded, or otherwise secured, to a perpendicular hollow tube which introduces and expels ambient air. A divider wall is disposed within the penetrating tube to force introduced ambient air along the length of the penetrating tube before exiting the recuperator. This arrangement exposes the ambient air to the heated surface of the penetrating tube along its entire flow path, substantially twice the length of the penetrating tube. A spiralled strip of 14 gage stainless steel may be disposed within the penetrating tube to enhance heat exchange between the penetrating tube and ambient air flowing there within.

Abstract: A catalytic gas radiant tube heater, and a method for its use. A radiant tube encloses a catalyst tube containing a catalyst on a catalyst support. Air and a gaseous hydrocarbon fuel diffuse into the catalyst support and react on the catalyst surfaces. The reaction heats the catalyst tube, causing the catalyst tube to emit infrared radiation, which heats the radiant tube from within, causing the radiant tube to emit infrared radiation. The infrared radiation emitted by the radiant tube is directed in the desired direction by a reflector. The preferred catalyst is cobalt chromium oxide spinel.

Abstract: The present invention, a burner control system for use with a radiant tube heating system having a source of compressed air and compressed fuel, the burner control system includes a burner for combustion of an air/fuel mixture; a mixing block for receiving and mixing air and fuel and communicating the combustible air and fuel mixture to the burner; the source of compressed air communicating air under pressure to the mixing block and to an air regulator; the air regulator, receiving air from the source of compressed air and for discharging and communicating pressure controlled air to a fuel regulator; and the fuel regulator for receiving fuel under pressure and discharging and communicating a pressure regulated supply of fuel to the mixing block, the fuel regulator also communicating with and operably connected to the pressure controlled air, wherein the pressure of the fuel communicated to said mixing block is controlled by and a function of the pressure controlled air communicated to said fuel regulator.

Abstract: A method and apparatus for reducing emissions in combustion products. Fuel and primary oxidant are introduced into a burner tube and discharged as a fuel/oxidant mixture, preferably fuel-rich, into a primary combustion chamber. The combustion flame entrains, through a peripheral gap between the burner tube and a wall of a first housing, a first portion of secondary oxidant in the primary combustion chamber. The combustion flame is then directed, preferably through a swaged orifice, into a secondary combustion chamber. Within the secondary combustion chamber, the combustion flame entrains a second portion of secondary oxidant and then combustion products are discharged through an exhaust tube.

Abstract: Combustibles such as oily substances adhered to or impregnated in metallic articles are removed, before the articles are subjected to a heat-treatment for carburizing or sintering them, by heating them in a heating chamber with a combustion tube, and discharging the combustibles outside of the chamber after having sucked under a negative air pressure the combustibles into the tube instantly they have been evaporated from the articles and after having burnt the combustibles in the tube.

Abstract: A vaporizing combustion chamber for a heater running on liquid fuel, in particular a vehicle heater, in which inter alia two pipes disposed concentrically one inside the other form therebetween an annular chamber which is closed at a first end. At the second end, the annular chamber is open and leads into a flame diaphragm which projects radially inwards from the outer pipe and is located at a spacing in front of the inner pipe. At both its ends the inner pipe is substantially open and the opening at the second end is contracted by a concentric baffle edge of a baffle plate. In order to improve the emission values of the combustion chamber exhaust gas and reduce combustion noises both when the combustion chamber is disposed horizontally and when it is disposed vertically, the opening in the flame diaphragm is eccentric to the opening, in the inner pipe, formed by the baffle edge of the baffle plate.

Abstract: The invention relates to a heating device (100) employing catalytic combustion of gas, especially of petroleum gases, comprising:a flat combustion enclosure (110) delimited by two parallel large plane walls (111, 112), at least one of which is a heater plate made of a metallic material, the said combustion enclosure (110) being provided with at least one gas inlet (130a, 132a, 132b, 134a) and one outlet (111a, 111b),a gas circulation circuit, devised inside the said combustion enclosure (110) between each gas inlet and each outlet, the gas circulation circuit passing through at least one catalytic contact surface (121a, 122a, 123a, 124a).

Abstract: A heat exchanger for a cooking chamber extends around a ventilator fan of the cooking chamber and has a burner tube connected to one end of a first portion of the heat exchanger and has a reverse bend so a second portion extends parallel to the first portion in the opposite direction. The tube is mounted by the burner and the opposite end so that the reverse bends allows for compensation of thermal expansion in the tube during a heating process.

Abstract: A burner apparatus for gas-fired appliances, such as gas furnaces. The burner apparatus includes an improved flame holder structure, with a contoured surface, for controlling the shape and contour of the flame.

Abstract: An apparatus for reducing the resonant type noise generated in a combustion driven heating apparatus. A dissipative device is disposed within a hot gas passageway to absorb and attenuate acoustic wave energy and thereby reducing the resonant noise level of the heating apparatus.

Abstract: A low emission combustion system for use in a fuel-fired apparatus includes a fuel-fired burner (30) operative for generating a flame extending substantially axially outwardly from the outlet of the burner, a heat transfer tube (40) opposed to the outlet of the burner whereby the flame extending from said burner passes into a flame inlet section (48) of the gas flow conduit (46) of the heat transfer tube, a radiator body (50) disposed within the flame inlet section of the gas flow conduit of the heat transfer tube, and a catalytic converter (60) for oxidizing carbon monoxide to carbon dioxide. The radiator body (50) has a thermal mass sufficient to reduce peak flame temperatures in the flame inlet section to less than 2800 F. The catalytic converter is disposed within the gas flow conduit at a location downstream of the radiator body.

Abstract: A ceramic recuperator (18) for a recuperator burner (1) is provided, in its heat exchanger region, with a plurality of radially inward- and outward-extending teeth. On the otherwise hollow-cylindrical recuperator (18), the teeth (19) are arranged in groups, e.g., in rings; the teeth of one ring are each offset from the teeth of an adjacent ring. Alternatively, it is possible to arrange the teeth on a single- or multi-start helical line. The recuperator can be produced economically by the slip-casting method.

Abstract: A propane burner system for orchards includes a housing, a venturi system, and a propane fuel system. The housing preferably includes a bottom enclosure interconnected with a stack and may be a converted standard fuel burning orchard heater. The venturi system is positioned within the bottom enclosure so that it extends into the stack. The bottom enclosure has at least one vent/fuel opening and the stack preferably includes an igniter opening. The venturi system includes a support system, a flue that is preferably triangular in crosssection, an exhausting chamber, and a deflector plate.

Abstract: A spark ignited burner that includes a fuel-oxidant pre-mixing chamber upstream of both an annular ignition spark discharge gap and a main fuel outlet. A continuous ignition discharge spark is established and maintained across the annular ignition spark discharge gap and used to ignite a pre-mixed fuel-oxidant mixture, which in turn is used to ignite the main burner flame.

Abstract: A radiant tube assembly includes a radiant tube having a burner leg with a burner therein, an exhaust leg and a connector leg. A recuperator is located inside the exhaust leg in a stream of products of combustion flowing through the exhaust leg. The recuperator has an air inlet port at the outer end and a mixing baffle at the inner end. The mixing baffle causes combustion air and products of combustion to be mixed at the inner end of the recuperator and the mixture is supplied to the burner for combustion.

Abstract: To sealingly retain a radiant heat exchange tube extending through an opening (5) in a wall (3) of a furnace, and to isolate the atmosphere within the furnace space (2) from outside ambient space, a thin-wall sleeve (25) has a first portion (40) shrinkfitted around the radiant heat exchange tube (7) which, for high temperature resistance, is made of a ceramic, preferably silicon carbide. A second portion (42, 44, 46) of the sleeve (25) which conically expands, is secured to a flange element (23), for example by welding, which, in turn, is secured for examples by screws, to a flange structure (8) on the wall (3) of the furnace. The flange element (23) has an inner diameter which is greater than the outer diameter of the tube (7). The sleeve (25) is preferably made of iron-nickel and has a wall thickness which is about 1/10 of the wall thickness of the ceramic tube (7).

Abstract: A gas heating apparatus has a cylindrical outer shell disposed along a duct in which a gas to be heated flows. A pre-mixture gas supply tube is connected to the outer shell. A combustion unit including a sintered fiber mat is provided inside the outer shell with a spacing being provided between outer shell and the sintered fiber mat. The combustion unit burns the pre-mixture gas on an inner surface of the sintered fiber mat. A diffusion burner is preferably provided upstream of the outer shell and of the combustion unit to increase the heating effect. With these constructions, it is possible to obtain a smaller-sized heating apparatus which produces a higher output.

Abstract: The fuel in the fuel rich inner cone of the flame is catalyzed by a partial oxidation catalyst into carbon monoxide and hydrogen which have a lower peak flame temperature thereby reducing thermal NO.sub.x. The insert is heated and radiates heat with a further reduction of peak flame temperature.

Abstract: A process and apparatus for combustion of fuel which results in reduction of nitrogen oxides and carbon monoxides emissions. Fuel and primary air are preferably premixed and introduced into a combustion chamber. Secondary air is introduced through a plurality of secondary air ports which are positioned about a venturi nozzle or flame holder disk mounted with respect to a combustion chamber wall. The secondary air flowing through the secondary air ports forms relatively high velocity and momentum secondary air jets that promote rapid mixing of the fuel and primary air mixture into the secondary air flow, such that a combustion flame is established at a periphery of the secondary air jets.

Abstract: A forced air, wall heater includes a heat exchanger which has a plurality of tubes. Each of the tubes include substantially parallel aligned runs and at least one return section between adjacent runs. The return section is aligned generally perpendicular with each of the plurality of runs. The heater also includes a blower positioned for blowing air directly toward the return section to maximize the mass flow rate of air over the return section. At least two of the runs are offset both laterally and in the direction of air flow with respect to each other. The ordering of tubes differs in at least two positions within the exchanger.

Abstract: A high intensity and high efficiency radiant gas burner (10) has a housing (8), a gas inlet (11) for receiving a combustible gas, a gas injection plate (13) for distributing the gas, a gas distribution chamber (16) for permitting the gas to expand, a porous ceramic layer (17) for receiving the gas from the gas distribution chamber (16), and a plurality of elongated flame support rods (23) situated over and spaced from a burner surface (17b) of the porous ceramic layer (17). When the gas is ignited, the flame transfers energy via convective heat transfer to the rods (23). When the rods (23) heat up, they radiate energy back towards the burner surface (17b) and also outwardly away from the burner surface (17b) so that radiation intensity and efficiency are optimized. A rod adjustment mechanism (84) may be disposed on the burner (10) for moving the rods (23) to thereby optimize radiation intensity and efficiency.

Abstract: A gas heating apparatus comprises a duct constructed by a heat insulating material having a heat resisting property, a plurality of honeycombs disposed across in the duct so as to oppose to a direction of a gas flow in the duct, the honeycombs being formed of a material having a heat resisting property, and a plurality of heat radiating members disposed inside the duct so as to oppose to the honeycombs, respectively, for radiating heat to the honeycombs. The gas entering the duct flows therein and is heated during the passing through the honeycombs. The honeycombs are constituted as partition walls.

Abstract: A compact gas-fired radiant space heater is adapted for residential use, having an output in the 20k BTU to 40k BTU/hr range and exterior dimensions small enough to allow it to be installed in a standard two foot by four foot suspended ceiling opening. A radiator tube having a total length of approximately 15 feet is bent into a serpentine shape, and combustion control components are housed within a plenum chamber supplying combustion air to the tube, both the tube and the chamber being encircled by a frame that fits within the two foot by four foot opening. The combustion control components are attached to a chassis plate whereby the components are removable from the plenum chamber as a unit to enhance serviceability of the heater. A burner venturi of novel configuration produces a flame that is less than four feet long yet which is relatively quiet.

Abstract: A space heating appliance includes a radiant duct which, when heated, emits radiant heat for heating an area adjacent the duct. An insulated cowling shrouds the side of the duct away from the area to be heated in spaced relation to the duct. The cowling has a heat-emissive surface which when heated emits radiant heat toward the space to be heated. Between the duct and cowling in closely spaced proximity to the duct is an insulated heat shield which traps and redirects heat back to the duct in order to maintain the duct at a higher temperature and concentrate the emission of heat in the direction of the area to be heated.

Abstract: A boiler is provided with a radiation heat transfer section in its combustion chamber, which has therein, at least one regenerative-heating burner system including a pair of burners each with a regenerative bed. The burners receive combustion air and exhaust combustion gas which passes through the regenerative beds. Combustion is alternately effected in one of the burners and combustion gas is passed into the other burner, and exhausted through the corresponding regenerative bed of this other burner. Surplus thermal energy which is not completely consumed in the radiation heat transfer section is recovered in the regenerative bed. Combustion air then passes through the heated regenerative bed to heat the air. The boiler temperature is kept flat across the boiler. That is, the temperature is kept almost constant across the combustion chamber. This is done by maintaining a high rate of forced supply of more than 60 m/s for the combustion air.

Abstract: A porous, ceramic member defines both the burner and baffle. Gaseous fuel is supplied under pressure into a chamber and flows through the ceramic member and, in flowing, causes the aspiration of atmospheric air into the flowing gaseous fuel. The air-fuel mixture is ignited a short distance downstream of the chamber and the flame flows through the ceramic member and emerges from the ceramic member within the heat exchanger. The air mixing with the gaseous fuel causes turbulence and mixing of the gas and cools the flame prior to its reaching temperatures associated with the generation of thermal NO.sub.x.

Abstract: A baffle is located in a recessed location relative to the inlet of a heat exchanger tube and facing the burner. The baffle is made of high temperature ceramic foam and has a plurality of flutes which define the flow path. In passing through the baffle, the velocity of the flame pattern is increased which reduces the noise level. The baffle also reduces NO.sub.x as a result of heat transfer to the baffle.

Abstract: A spiral, perforate ceramic baffle is placed into a heat exchanger in facing relationship with the burner and in an overhung relationship to the heat exchanger. A primary air/fuel mixture in the flame from the burner passes into the baffle drawing secondary air into the overhung portion of the baffle cooling the burner flame. Turbulence of the burner flame pattern in the baffle changes heat exchanger harmonic resonance and reduces burner noise.

Abstract: An industrial burner with low NO.sub.x emissions, particularly for heating furnace chambers of industrial furnaces, has a high-heat-resistance combustion chamber (9), which is formed with a fuel supply device and an air supply device and with at least one nozzle-shaped outlet (10) for the gases emerging into a heating chamber. The fuel supply device (17, 18) extends through the combustion chamber, which is acted upon constantly with air. The fuel supply device can be switched over between two operating states, with a differing three-dimensional location of fuel nozzle devices (25, 26) relative to the combustion chamber outlet. In a first operating state, fuel is introduced into the combustion chamber, creating a fuel/air mixture that burns with a stable flame in the combustion chamber, and in a second operating state, the reaction between the fuel and the combustion air is substantially shifted into the heating chamber.

Abstract: A high efficiency hot air furnace transfers substantially all of the combustion heat of a clean fuel gas fire to a stream of cool recirculating air by two heat exchangers both of which are mounted in a common plenum through which cool air is recirculated by means of a blower. It differs from the conventional high efficiency furnace in that the secondary heat exchanger is a porous movable heat sink which is alternately exposed to a stream of hot combustion gas and a part of the cool air stream from the recirculating air blower.

Abstract: A heat-dissipating extender is provided in a joint between a sealed-gas burner having a burner fitting and a gas supply tube having a tube fitting. The heat-dissipating extender includes a body having a first end, a second end, and an interior passage extending between the first end and the second end for passage of the gas from the tube to the burner. The first end has a first fitting interfitting with the burner fitting to provide a seal against leakage of fluid pressure. The second end has a second fitting interfitting with the tube fitting to provide a seal against leakage of fluid pressure. The body is adapted for dissipating heat to provide a substantial temperature differential between the first end and the second end when heat is applied to the burner fitting at the first end during operation of the burner so that the tube connection at the second end remains sealed.

Abstract: A direct vent gas baseboard heater has field installable concentric air intake tube and exhaust pipe. The intake pipe and exhaust tube can be cut separately from the remainder of the heater, improving the efficiency of installation. They can also be transported aligned with the remainder of the heater, reducing packaging size. The manufacturer can provide a single size of tube and pipe for a variety of installation situations. The tube connects to a base cabinet through a key hole configuration of tabs and cuts, and is twisted until the tabs meet stops in the base cabinet. An extrusion in an air box in the base cabinet is brought against a gasket on a flange of the tube, fixing the tube and sealing it with the air box. The exhaust tube has a threaded end and is threaded into an exhaust outlet in the air box, sealing it to a heat exchanger. A vent seal kit creates a seal assembly having a resiliently deformable ring seal extending into a wall sleeve with straps.

Abstract: A fuel fired, forced air, draft induced heating furnace is provided with NOx reduction apparatus associated with a plurality of combustor tubes forming a portion of its heat exchanger structure. In-shot type fuel burners are spaced apart from and face the open inlet ends of horizontal combustion sections of the combustor tubes. The NOx reduction apparatus includes a plurality of insert members received in inlet end portions of the combustor tubes. Each insert member is formed from a single sheet of metal mesh material and has a hollow, open-ended body portion coaxially received in its associated combustor tube and spaced laterally inwardly from its interior side surface, and a circumferentially spaced plurality of integral, laterally outwardly projecting support rib portions that slidably engage the interior side surface of the combustor tube, thereby automatically maintaining the insert member in a coaxial relationship with the combustor tube regardless of the positional orientation of the tube.

Abstract: A boiler has a radiation heat transfer section with opposite sides and boiler water tubes therein for passing boiler water to be heated by combustion gas in the radiation heat transfer section. The boiler water moves substantially in a selected direction in the radiation heat transfer section. A plurality of regenerative-heating-type burner systems are connected to the radiation heat transfer section. Each burner system has a regenerative bed and a burner. The burner systems are in pairs on the opposite sides of the radiation heat transfer section. A first mechanism supplies combustion air through the bed and to the burner of each burner system while a second mechanism supplies fuel to each burner system to form a flame that produces the combustion gas. A third mechanism causes the flow of air and gas to be changed over at intervals. Each pair of burner systems is controlled separately for defining a plurality of temperature zones in the radiation heat transfer section.

Abstract: A heating apparatus includes at least a pair of regenerative burner units having a fuel injection nozzle and a heat regenerator provided for a combustion air supply path. One regenerative burner unit is supplied with fuel through a fuel shut-off valve and a fuel change-over valve, and supplied with combustion air through a supply and exhaust change-over valve to perform combustion operation. The other regenerative burner unit performs heat regenerating operation by passing a combustion waste gas. Operations of the fuel shut-off valve, the fuel change-over valve and the supply and exhaust change-over valve are controlled depending upon an operation parameter of the heating apparatus.

Abstract: A burner for an industrial furnace has a plurality of lines passing through a furnace wall for fuel gas, burner air, and waste gas. Arranged in the furnace space is a combustion chamber (66) in which a mixture of fuel gas and burner air is combusted, and from which a flame (89) is directed into the furnace space. The combustion chamber (66) is delimited by walls (32, 65). The walls (32, 65) are arranged to be movable with respect to one another (65', 65"), so that the volume of the combustion chamber (66) is adjustable (FIG. 2).

Abstract: A gas-fired infrared radiator comprising a closed housing which includes a combustion chamber, with a side of the radiator that is to be directed towards an object being a radiation plate which forms a boundary of the combustion chamber, and comprising at least one burner, wherein the or each burner is a high-speed burner adapted for combustion in two combustion stages, with the second combustion stage taking place in the combustion chamber, the or each high-speed burner is arranged in such a manner that a flame formed by the or each high-speed burner is directed at the radiation plate, and gas guiding means are provided for partly recirculating flue gas which has been passed along the radiation plate, to the first or second combustion stage.

Abstract: Space heating appliance of the radiant tube type has sheet metal or other shield formations mounted in the tube to extend downstream of fan induced gas flow from side edges of the mouth of a fluid fueled burner head which projects into the tube to feed hot gases into the flow so as initially to separate that infeed from the general flow along the tube.

Abstract: This invention discloses a method and apparatus for heat recovery so constructed that in the process of supplying an oxidizing agent through an oxidizing agent supply path into the main body of a combustion apparatus and discharging a hot exhaust gas of combustion from the interior of the main body of the combustion apparatus, the oxidizing agent and the exhaust gas are caused to flow through a gas-pervious regenerating member formed in a lateral wall of the main body of the combustion apparatus and the area for passing the oxidizing agent in the regenerating part heated by the exhaust gas is changed along the course of time.

Abstract: This invention has an object of providing a compact and inexpensive apparatus and method of combustion for a pipestill heater which enjoys high thermal efficiency insusceptible of the restriction imposed by either the inlet temperature of the process fluidor the magnitude of the allowable pressure drop in the coil, incurs only a sparing possibility of polluting the environment, and produces only a petty pressure fluctuation in the combustion chamber.In the pipestill heater of this invention, the combustion devices which are disposed so as to confront the combustion chambers of the furnace are each provided with an air permeable heat accumulator made of a refractory material and a duct part having an oxidizing agent supply path and an exhaust gas discharge path formed therein, whereby the oxidizing agent for combustion is heated with the exhaust gas through the heat accumulator by virtue of the relative rotation of the heat accumulator and the duct part with rotating means.

Abstract: A pipestill heater capable of increasing heat efficiency without using a large-sized oxidizing agent heating unit. The pipestill heater includes a radiation section and a convection section for preheating process fluid by exhaust gas of an elevated temperature discharged through a gas discharge path. A combustion device including a combination of a burner and a heat exchanger is arranged on a furnace floor constituting a part of a furnace wall. The heat exchanger includes a regenerator heated by exhaust gas to heat an oxidizing agent and a duct structure including an oxidizing agent passage and an exhaust passage. The regenerator is rotated relative to both passages. Exhaust gas is guided through both a gas discharge path and an exhaust passage.