Abstract: To improve the efficiency of recuperator burners, preferably to over 80%, a recuperator burner (10) is equipped with an auxiliary heat exchanger (26) which surrounds the recuperator (22), wherein both the recuperator and the auxiliary heat exchanger are preferably formed as purely counterdirectional-flow heat exchangers, wherein the auxiliary heat exchanger (26) has the air supplied to it on the side facing toward the furnace wall (11). The housing (15) around the auxiliary heat exchanger (26) can be cooled with cool air from the inside. In one configuration, the air is initially conducted to a flange cooler (45) to protect the region of the flange (16) against the exhaust-gas temperature. For example, the ceramic recuperator pipe (26) is resiliently pressed, and sealed off, against an outlet-side surface (35) of the auxiliary heat exchanger (26), which preferably has gap-like air ducts (39) formed in flattened pipes (40).

Abstract: The present invention relates to a condensing heat exchanger and a boiler/water heater including the same and, more particularly, to a condensing heat exchanger, which can increase a contact area between water and a combustion gas having high temperature and improve efficiency by passing a combustion gas, generated from a combustion chamber, through a plurality of exhaust pipes and which can be fabricated in a small and compact size, and a boiler/water heater including the same.

Abstract: A heat exchange apparatus, particularly a fire tube condensing boiler, provided with a structure made of carbon steel and comprising an outer enclosure, which is adapted to delimit a portion of space for containing the fluid to be heated, which is fed cold by means of an intake coupling located proximate to the base and flows out hot through a discharge coupling located proximate to the top of the enclosure, said portion of space being crossed by flue gas conveyance tubes, further comprising a bell-shaped element, which is located proximate to the top of said portion of space and is open at the lower end and closed at the upper end, said bell-shaped element being provided with a thermostatic device which is adapted to allow the fluid contained therein to flow out when it reaches a preset temperature.

Abstract: Two improvements for heaters are disclosed which can be implemented as either apparatus or method. First is a novel flue gas injection system. Second is a novel burner configuration. The improvements can be used alone or together. In the flue gas injection system, flue gas is injected between the burners and the tubes to reduce heat flux on the tubes and shift part of the heat duty from the radiant to the convective section. These approaches work toward increasing the capacity of heaters where we can increase the firing rate in the heater and still keep the tube metal temperature and radiant fluxes within acceptable limits.

Abstract: A fuel-fired water heater has a three-pass condensing type heat exchanger disposed within its tank and having a central vertical first pass flue pipe separated into upper and lower portions by an internal dividing structure. Respectively coupled to the upper and lower first pass flue pipe portions are circumferentially spaced series of vertical second and third pass flue pipes which circumscribe the central flue pipe within the tank. During firing of the water heater, combustion gases from a power burner are sequentially forced downwardly through the upper portion of the first pass flue pipe, upwardly through the second pass flue pipes to an upper plenum external to the tank, and then downwardly through the third pass flue pipes and the lower central pipe portion into a bottom plenum external to the tank for discharge from the water heater.

Abstract: An improved method and apparatus for controlling a laser projection assisted assembly operation includes the ability to display a menu with the laser projector. An operator is able to request the menu be displayed at the operator's location. The menu provides the operator the ability to select from several display options. By selecting an icon associated with a desired display option, the operator is able to change the display option at a location remote from the control. This is particularly valuable in large laser assisted work assemblies.

Abstract: A heat exchanger assembly for a paint baking booth includes a horizontal cylindrical fire box with a vertical cylindrical hot gas riser chamber atop the fire box. A tube mounting plate across and sealed to the the top of the riser chamber extends outwardly from it. There is an array of circularly spaced fire tubes. Each tube has an entrance at the bottom of the mounting plate inside the top of the riser chamber, and extends upwardly and outwardly therefrom and then downwardly along side the riser chamber and then further outwardly and then upwardly parallel to the downward extending portion and then inwardly and upwardly into a stack for exhaust to the exterior of the building.

Abstract: A high efficiency forced draft water and space heater maintains a desired air to fuel ratio and efficiency in combustion regardless of changes in air inlet pressure. The heater uses a venturi type proportioner and associated fuel regulator to provide an air and fuel mixture of constant ratio which is drawn from the proportioner by a blower and introduced into a closed combustion chamber for efficient burning and heating of a surrounding body of water.

Abstract: A fluidized bed heat generator with improved collector for ash removal and heat recovery comprises a central hearth having a fluidization grid at its lower end. The side wall of the hearth is enclosed by a hollow peripheral enclosure to define an intermediate volume therebetween which is connected both to the upper part of the hearth and to fume tubes. These fume tubes extend through the peripheral enclosure and open into a fume exit conduit such that fumes and entrained ash from the hearth can be directed via the intermediate volume and the fume tubes to the fume exit conduit. Water is arranged to circulate within the peripheral enclosure around the hearth and fume tubes.

Abstract: An apparatus is described capable of functioning as a high-efficiency water heater. This apparatus passes a combustible mixture of gas and air from an impeller into the hollow interior of a cylindrical gas burner. The combustible mixture flows out through apertures in the cylindrical walls of the gas burner and is burned on a cylindrical flame as it emerges from the gas burner; the size of the apertures prevents flash-back of the flames of the combustible mixture into the gas burner. Heat is transferred from the flame to the walls of a cylindrical combustion chamber surrounding the gas burner and the combustion products generated pass to a heat exchanger comprising a vertical riser and a downwardly extending helical section which ensures maximum heat transfer to liquid in the tank surround the combustion chamber and heat exchanger. The apparatus may be used solely as a water heater or may serve as a combined gas furnace and water heating system.

Abstract: The invention concerns a process for operating a coal-dust fired power plant in environmentally sound fashion and arrangements for accomplishment of the process pursuant to the invention. The same relates in particular to the reduction of the emission of gases harmful to the environment such as NO.sub.x and SO.sub.2.A particularly surface-active coal dust is used and is heated extremely rapidly in a burner muffle before being mixed with combustion air. After combustion the flame gases are very rapidly cooled down to a temperature under 1000.degree. C. before being discharged from the burner muffle.

Abstract: A liquid heating apparatus according to the present invention comprises a cylindrical outer shell, an inner shell consisting of a cylindrical body whose upper and lower portions are respectively provided with an enlarged flue chamber having a cross-sectional area remarkably larger than that of said cylindrical body, said inner shell being disposed within said outer shell so as to provide a space forming a water jacket between the two shells, a fire chamber formed by closing said cylindrical body at above said lower enlarged flue chamber, an insert hole for burner which penetrates said inner and outer shells and opens into said fire chamber, a rising heated gas chamber which is disposed above said fire chamber so as to communicate with it as well as said upper enlarged flue chamber, a falling heated gas space formed by intercommunicating said upper and lower enlarged flue chambers by means of plural smoke pipes penetrating the water jacket formed in between said outer shell and inner shell, and a flue outlet p

Abstract: A vertical steam or hot water boiler comprises a convection part and an aligned final combustion chamber. A flame tube passes centrally through the convection part, communicating at its lower end with the combustion chamber, and is provided with a burner at its upper end. An air preheating chamber is provided on top of the convection part, being separated from a turning chamber for the smoke gases by a common wall, a portion of said air preheating chamber extending towards the flame tube. The burner head is surrounded by a labyrinth formed by baffles, directing air form the air chamber to the burner.