Abstract: A tube has one end portion supported within an opening in a heat-insulating wall and is fired by a dual fuel burner. Disposed within the one end portion of the tube is a combustion sleeve which extends the flame of the burner inwardly beyond the wall and thereby prevents the insulated end portion of the tube from being burned out. An abrupt restriction is formed at the discharge end of the combustion sleeve and creates turbulence in the air/fuel mixture to promote cleaner and more efficient burning.

Abstract: A method and apparatus for burning oil or gas mixed with air to produce a long stable flame in which the fuel is atomized in a chamber by a primary atomizing medium introduced tangentially into the chamber to form a confined stream, secondary air moving parallel to the confined streams mixed with the stream which is then expanded and tertiary air supplied to the stream in a helical swirling path about the stream periphery.

Abstract: A recuperator and burner shroud assembly for use on a radiant tube burner. The recuperator has two concentric tubes, one connected to the outlet of the radiant tube burner and serving as a stack, the other forming a jacket about the stack for carrying a countercurrent flow of air to the burner. The space between the two tubes is closed at the discharge end of the stack by a peripheral seal that permits relative axial movement between the tubes. A conduit carries heated air from the jacket to a burner shroud, which encapsulates the air inlet portion of the burner, and directs the air into the burner in a manner that establishes a swirling or helical path of travel of combustion products through the burner tube.

Abstract: A tube-fired radiant energy heating system comprising a burner of high rated capability and having a combustion chamber which is connected to an elongate radiant energy emitter tube typically carring a directing reflector, and connected at the output end to a power exhaust fan. Fixed primary and adjustable excess air inlet means are provided at the burner unit to permit excess air to be continuously drawn around the combustion chamber and into the radiant energy heater tube to be mixed with the ignited primary fuel/air mixture at the inlet to the heater tube. This method of firing permits the construction of the apparatus using lower cost materials which, if used in a burner system fired at Stoichiometric fuel/air ratios, would be thermally oxidized and weakened. The excess air flow results in the control of the emitted air temperature to safe levels, minimizing oxidation and maintaining the high tensile strength with high BTU inputs.

Abstract: A system for the direct firing of immersion tubes for heating of liquids in vats or tanks, including a gas burner, of the postmixer nozzle type comprising a gas supply tube having a blanked off downstream end provided with a series of peripheral gas ports, the gas tube being concentrically disposed within an air tube and having a perforated cone attached thereto slightly rearwardly of the gas ports, the arrangement being such that gas and air is entrained above atmospheric pressure and thoroughly mixed at the burner head by the turbulent flow of air through the perforated cone and around its periphery so as to create regions of gas rich and weak mixtures whereby to obtain flame stability. The system also includes a combustion chamber communicating the burner with the immersion tube.

Abstract: A portable electric radiant heater comprises an insulative housing having a control area and an open front heating area. A hollow fired clay pipe system is disposed in the heating area in serpentine fashion and arranged to radiate heat through the open front. The clay pipe system comprises a plurality of hollow cylindrical pipe segments having a plurality of hollow protuberances extending therefrom. The pipe segments are interconnected together to form a continuous passage extending the length of the pipe system. An electric resistance heating wire extends centrally through the continuous passage in spaced relation to the surfaces defining the passage. The ends of the wire extend into the control area and are connected to a power supply means therein controlled by a thermostatic control having a sensing element enclosed in a clay cylinder disposed in heating area below the heat radiating pipe system.

Abstract: An insert is adapted to be arranged within the marginal end portion of a heat-radiating tube. The insert has an outer surface comprising an alternating series of peaks and valleys. The insert serves to insulate the tube marginal portion from the direct heat of a flame directed into and confined within the insert. The outer surface of the insert defines with the tube inner surface, a plurality of passageways. In use, air drawn into the tube through these passageways is preheated, and subsequently directed to oxidize the flame tip.

Abstract: A combustion chamber especially adapted for use in a high heating capacity, positive-pressure, single-pass radiant heating system employing an oil-fired burner as the heat source comprises a generally cylindrical body having conical ends, one of which has a high degree of taper and is adapted to mount the air tube of an oil-fired burner, and the other of which has a lower degree of taper and is adapted to mount a heating conduit through which combustion products are passed.

Abstract: A heater includes coaxially arranged an external heat radiating shell, a central gas fuel tube and an intermediate perforated air conducting tube, from inside of which air flows into a combustion chamber.A tubular partition is provided with the space in between the air conducting tube and the central gas fuel tube, whereby the initial air flow blowing around and lengthwise of the gas fuel tube is to be turned near the end of this tube to pass to the perforated walls of the air conducting tube.