Abstract: A fuel-conveying incineration grate has grate beams (1) for extending in a longitudinal direction obliquely downward in the longitudinal direction. The grate beams (1) have first surfaces (4) on first sides of the grate beams (1) stepped downwardly in said direction for receiving fuel, opposite surfaces on opposite sides of the grate beams (1), and lateral surfaces (3) sealingly closely adjacent to each other across widths of the grate beams (1) substantially along full lengths of the grate beams (1) in the longitudinal direction. The grate beams (1)relatively reciprocate in the longitudinal direction for conveyting the fuel thereon. At least two longitudinally extending ducts (6, 7) are in thermal communication with the opposite sides of the grate beams (1) for a heat-transmission medium. Connecting points (12, 13) at least at one end of the grate beams (1) provide for flow of the heat-transmission medium at least one of towards and away form the ducts (6, 7).

Abstract: A fireplace combustion system in which a sealed firebox contains: a base having apertures connected to a source of combustion air and wherein a hollow grate is connected to one of the apertures to conduct combustion air to a quantity of fuel disposed on the grate; a plurality of baffles and deflectors are utilized to direct the products of combustion above the grate for flow through a quantity of porous refractory material so that the refractory material is heated by the products of combustion to a temperature sufficient to ignite the unburned gases present; and a flue for exhausting the products of combustion. The grate is provided with a plurality of apertures at various levels above the bottom to supply combustion air at varying temperatures at different locations in the burning fuel. Suitable valve means are used to control the amount and direction of the air flow through the apertures in the base to different primary and secondary burning zones in the firebox.

Abstract: The specification describes a system for initiating and promoting combustion of fuels such as wood, coal, oil, etc. Virtually complete combustion is achieved by feeding combustion air under pressure through openings in a diffuser plate with the diameter of the opening having a calculated size and spacing therebetween. By-products of primary combustion are burned by the system. The specification also describes an exemplary wood stove and a cooking unit which utilizes the novel combustion principle.

Abstract: An induced draft stove has a housing in which a food-supporting grate is disposed above a solid fuel-supporting grate. Burning solid fuel within the stove creates an induced flow of ambient combustion air to the fuel which is sequentially drawn into a pair of manually dampered inlet plenum boxes carried by the housing, through an air supply manifold, and into the open ends of a laterally spaced series of horizontally extending air delivery tubes which are removably positioned within the housing beneath the fuel grate. Combustion air entering the tubes is drawn downwardly through bottom outlet openings therein, flowed upwardly along lower exterior surface portions of the tubes, through the spaces between adjacent tube pairs, and then upwardly to the burning fuel. Upper side portions of the tubes shield the bottom outlet openings therein to prevent ash and other fuel bits falling from the fuel grate from clogging these outlet openings.

Abstract: A fire grate is adapted to support a combustible mass. It is inclined longitudinally from a feed end at which it receives the combustible mass to a discharge end. It comprises a plurality of elements disposed in transverse rows alternately fixed and mobile. Each element is rectangular in plan and has a top side and a bottom side, openings by means of which the top side and the bottom side communicate, and a generally transversely oriented front protuberance on the top side in the vicinity of its transverse edge at the feed end. All the openings are in a dorsal surface of the front protuberance facing the discharge end.

Abstract: A woodburning stove, fireplace, or the like which includes a hearth in a chamber with a flue outlet at a top thereof and a closeable bottom plate provided in a bottom of the chamber. A further chamber is provided under the plate, with the further chamber being lined with a refractory material. The further chamber includes a flue outlet duct to the upper chamber communicating at a rear end thereof so that flue from the fuel fired in the further chamber is substantially entirely combusted, with the combustion temperature being high and the combustion time for a given fuel supply in the further chamber being considerably longer as compared to the same amount of fuel in, for example, a conventional heating stove.

Abstract: A stove and method for burning solid fuels having an insulated primary combustion chamber, uniform distribution of preheated primary air through upward facing holes in a grate, downward flow of combustion gas through the grate, retention of hot coals in the grate structure, preheated secondary air, individually controlled primary and secondary air flows, insulated vortex combustion chambers for secondary combustion, longitudinally finned tubes as a first stage heat exchanger, plate-fin assembly as a second stage heat exchanger, an induced draft fan to draw the air and combustion gases through the combustion chambers as well as the heat exchangers, and a forced air fan to blow cool room air through the two stage heat exchanger.

Abstract: A device for use in fireplaces or wood stoves to facilitate the burning of small fires, e.g., fires having only one or two logs burning at a time, and to provide more radiated heat from the fire, is disclosed. The device is a log support, consisting essentially of a hollow, elongated, rectangular box constructed of iron, the box being open at both ends, having a plurality of openings in its top, a plurality of openings in its bottom, and a plurality of openings in each of its sides, and having means on its top surface for preventing a round log from rolling off the box.

Abstract: A stove for burning solid fuel such as wood, coal or briquets in a more efficient manner utilizes preheated outside air for primary and secondary combustion and has tempered glass windows for observation. The combustion air flow is directed so as to minimize obscuring of the glass by deposits of unburned volatiles. A fire chamber is provided with self-feeding grate, and the stove also has a secondary grate, a high proportion of radiating and convective surfaces, a heat exchanger, a cooking surface, an automatic linkage between a fuel loading door and an opening-reducing damper to limit back drafts and thermostatic control to ensure complete combustion and efficient heat exchange. The self-feeding grate has a thermostatic grate shaker to promote unattended complete combustion, and can be replaced to match the fuel used.

Abstract: A bio-mass burner having a continuous feed on demand to a first combustion chamber that contains a hollow grate structure. The novel method of operation includes the use of at least one venturi tube which is in fluid communication with the hollow grate structure to establish an air flow into a second combustion chamber. Primary air to support combustion in the first chamber is supplied to the underside of the grate structure. Secondary air to support combustion in the second chamber is supplied through the hollow grate structure and then to the venturi tube in a sufficiently tortuous path through the first combustion chamber to insure that the air is superheated at the outlet of the venturi tube. A baffle arrangement in the first combustion chamber directs the fuel product toward the grate structure and assists in preventing any unburned gases from being ejected into the atmosphere.

Abstract: The invention relates to a stove which burns a primary combustible material in a container placed on a horizontal plate which divides the stove into upper and lower combustion chambers. The plate has a central aperture therethrough which, in operation, is in registry with a central opening in the container bottom wall. A hollow perforated tube is positioned in the container in registry with the opening and the aperture and the combustible material fills the container, surrounding the wall of the tube. When a temporary starting fire is lit in the lower chamber, the flames thereof will be drawn up into the tube and will light the combustible material in the container through the perforations in the tube. The combustible material in the container will burn radially outwardly from the tube in a uniform manner, with air circulation being provided in the expanding annular space between the tube and the burning face of the combustible material.

Abstract: The present invention relates to air-cooled grate bars, in particular for mechanically conveying mechanical grates such as pivot step grates, comprising a cap of U-shape which is provided over the respective grate bar and is in particular welded on and which forms with the grate bar disposed therebelow passages extending longitudinally of the grate bar, the cap being led at the bearing-side end of the grate bar up to shortly before the curvature end and the cap and thus the passages being in each case sealed at the end face at the curved cap end.