Abstract: A process for cyclonic combustion of fuel in a combustor comprising mixing the fuel and oxidant forming a fuel/oxidant mixture prior to injection into said combustor, tangentially injecting the fuel/oxidant mixture into a first combustor chamber, igniting the fuel/oxidant mixture producing combustion products, exhausting the combustion products at a downstream end of a second combustor chamber in fluid communication with the first combustor chamber, and cooling a wall of the second combustor chamber, and an apparatus for carrying out this process.

Abstract: A low pollutant emission, high efficiency cyclonic burner and cyclonic combustion process for firetube boilers and heaters in which the combustion air required for complete combustion is introduced into the cyclonic burner in stages. Fuel and primary combustion air in an amount of about 30% to about 90% of the stoichiometric requirement for complete combustion of the fuel are tangentially injected into a primary combustion zone of a combustion chamber within the burner. Secondary combustion air in an amount of about 10% to about 90% of the stoichiometric requirement for complete combustion of the fuel is introduced into a secondary combustion zone in the combustion chamber downstream of the primary combustion zone. The combustion chamber walls are cooled to maintain the combustion chamber temperature between about 1600.degree. F. and 2400.degree. F.

Abstract: A vehicle auxiliary heating device of the type which has a burner aggregate, a burner pipe forming a combustion chamber and a heat transfer arrangement that contains an inner jacket with ribs and an outer jacket is improved by having the outer jacket and the inner jacket provided with ribs formed of a one-piece extruded profile part. On the ends of the inner and outer jackets facing away from the burner aggregate, lid parts are attached which, preferably, are welded on and effectively are formed by aluminum sheet parts and/or cast parts. Furthermore, the end of the extruded profile part facing the burner aggregate may be shaped to directly provide a receiving flange for the burner aggregate or a closure ring part may be fastened, preferably by welding, at this end of the extruded profile part, for the attachment of the burner aggregate.

Abstract: The invention relates to gas-, or oil-burning warm water, hot water or steam boilers, mainly for the supply of households, communal institutions, and industrial plants, the surfaces of which surrounding the furnace are formed as membrane walls having annular passageways connected by thin plates, the passageways receiving the heat carrying agent.The essence of the invention is that the flue-tube of the boiler is formed as a body of rotation with varying cross section conforming to the extent of heat radiation, and the flue-tube is surrounded by another convective heat exchanging flue-tube formed as a membrane wall conforming to the shape of the inner flue-tube, the convective heat exchanging flue-tube defining a flue passage with the inner flue-tube, the linings of the membrane wall of the annular passageways of the outer flue-tube being offset in relation to the passageways of the membrane wall of the inner flue-tube.

Abstract: A central heating boiler comprising a combustion chamber, flue gas passages, a flue gas collecting chamber and a liquid jacket surrounding both the combustion chamber and the flue gas passages, the inner wall part of said jacket surrounding the flue gas passages being composed of interwelded section staves, of which each one confines a flue gas passages, said inner wall part being very rigid, all other wall parts of the jacket being made of sheet metal and having such shapes and dimensions, as to ensure that the thermal stresses set up by the differences in expansion and shrinkage of the wall parts of the jacket remain under the breaking point of the sheet metal wall parts of the jacket and their welded points.

Abstract: A fuel burning boiler comprises a water holding shell of sheet steel having front and rear walls defining axially aligned openings. An insert body passes through the openings and is affixed thereto, the water being held between the shell and insert body. The insert body includes a cast iron casing providing a combustion chamber in the interior thereof, defining ducts for combustion gases of the fuel burnt in the combustion chamber and a smoke box at the rear wall and in communication with the ducts for receiving the combustion gases therefrom, and a sheet steel casing forming a skin over the cast iron casing and tightly fitting thereover. The sheet steel casing is fluid tightly connected with the front and rear walls of the shell around the rims of the opening therein.

Abstract: A heat exchanger in which the main component is formed of a plurality of elongated strips of rigid heat conductive material. The strips are generally transversely aligned and wound into a coil formation in which each of the surfaces of each strip is disposed in facing relation to the opposite surface of an adjacent strip in the coil. Each pair of facing surfaces is ridged to provide passage defining portions and force transmitting portions with certain of the strips having both end edges thereof sealingly secured to the corresponding end edges of an adjacent strip so as to define a longitudinal fluid passage having a coil formation other of the strips have both end edges thereof disposed out of sealing engagement with corresponding end edges of the adjacent strip so as to define a transverse fluid passage.

Abstract: A boiler for heating liquid which combines a source of hot gases directed first along the inner wall of an annular tank in a tortuous path formed by fins disposed upon the inner wall and then along the outer wall of the tank through a jet-impingement heat transfer system.

Abstract: A steel heating boiler for liquid or gaseous fuels, with a water-bearing housing, between the front and rear walls of which is arranged in a liquid-tight manner a cylindrical installation unit consisting of combustion chamber and fuel-gas flues. The steel heating boiler which is intended for the operation of hot-water heating systems is distinguished by the fact that the installation unit, whose combustion chamber and fuel-gas flues are provided with a corrosion-resistant lining known per se, has on the inside end closure members included in the lining, whose outside diameter is larger than the outside diameter of the installation unit, the outer peripheral edges of the end closure members being connected to the opening edges of the front and rear walls in a liquid-tight way and at least the inside diameter of the burner-side end closure member being made smaller than the inside diameter of the installation unit.

Abstract: An apparatus for heating a first fluid such as water or the like by moving such fluid in counterflow heat exchange relationship with a heated second fluid such as air. A spiral wall is provided in a portion of the apparatus which defines a spiral passageway for the heated fluid and such wall includes at least one conduit for the fluid to be heated. A removable wall normally closes one end of the heated area and the spiral wall to provide access thereto when the wall is removed.