A gas burner (1) comprises a support plate (2) with a passage opening (8) for the gas and an annular wall (11) formed around the passage opening (8), a diffusing wall (19) and a further flow element (20,21,22) inserted on the annular wall (11) in flow communication with the passage opening (8), wherein the annular wall (11) forms a plurality of punches (16) with a recess (17) and an opposite projection (23), wherein the recess (17) accommodates a locking protuberance (25) of the diffusing wall (19) and the projection (23) extends in a locking hole (24) of the further flow element (20, 21, 22).

A fixing plate for the thermal insulation material is attached to the combustion plate flange part. Provided that a direction leaving away from the air-fuel mixture ejection part of the combustion plate is defined as an outward side direction, there are disposed: on the side edge in the outward side direction of the fixing plate, bent edge parts, which come into contact with the side edge in the outward side direction of the thermal insulation materials; and a plurality of tongue-shaped pressing claws which are elongated from the bent edge part so as to press and prevent the thermal insulation materials from getting released away from the fixing plate.

A burner head that constitutes a combustion chamber for an exhaust gas processing apparatus by being attached to an upper portion of a combustion chamber main body is provided. The burner head includes a chassis which has a cylindrical portion having a lower opening and in which a fastening module for removably fastening to the combustion chamber main body is provided, a fuel nozzle that blows fuel into the cylindrical portion, a combustion supporting gas nozzle that blows combustion supporting gas into the cylindrical portion, a processing gas nozzle that blows processing gas into the cylindrical portion, and a pilot burner that ignites the fuel and/or the combustion supporting gas.

A gas-fired, powered infrared burner unit comprising a perforate distribution plate configured as a tray and a porous foam metal burner element carried in the tray, the combination overlying the open top of a plenum box and sealingly fastened to an edge flange of said box by a retainer having a surrounding flange fastened to the plenum box flange by welding, staking or other means so as to eliminate the need for a gasket. The foam metal medium is constructed of a foam metal alloy to have a pore size of 1000 micros5%, and produce, along with the perforations in the distribution tray, a port loading of between about 850 and 1,000 BTU/in.sup.2.

A burner has: a combustion plate part through which air-fuel mixture is ejected; and a flame rod which lies opposite to a portion of the combustion plate part. The combustion plate part is constituted by: a burner frame in a shape of a picture frame; a metal-fiber knit which covers an opening enclosed by the burner frame; and a distribution plate which has formed therein a multiplicity of distribution holes and which sandwiches the metal-fiber knit between the burner frame and the distribution plate so that the air-fuel mixture is ejected from the opening through the distribution holes and the metal-fiber knit. Flame holes for ejecting the air-fuel mixture are formed in a portion of the burner frame, and the flame rod is disposed so as to lie opposite to that portion of the burner frame which has formed therein the flame holes.

A burner has: a combustion plate part for ejecting air-fuel mixture; and a flame rod which lies opposite to a portion of the combustion plate part which has a picture-frame-like burner frame; a metal-fiber knit which covers an opening enclosed by the burner frame; and a distribution plate which has formed therein distribution holes and which sandwiches the metal-fiber knit between the burner frame and the distribution plate through the distribution holes and the metal-fiber knit. The flame rod has: a rod base part which lies opposite to a portion of opening peripheral part of the burner frame which is positioned on the same surface level as the opening; and a rod main body part which lies opposite to a portion of the metal-fiber knit. The distance between the rod base part and the opening peripheral part is made smaller than the distance between the rod main body part and the metal-fiber knit.

A premix gas burner comprises a metal plate structure, a burner deck and a shaped distributor plate. The metal plate structure is provided for mounting the premix gas burner in a heating appliance. The burner deck comprises a woven wire mesh on the outer surface of which premix gas is combusted after the premix gas has flown through the woven wire mesh. The shaped distributor plate comprises perforations. When the burner is in use the premix gas flows through the perforations of the shaped distributor plate before the premix gas flows through the woven wire mesh. One or more than one slot or notch shaped opening is provided in the shaped distributor plate. The woven wire mesh comprises a circumferential edge comprising at least one tab. The tab or tabs is/are inserted through a slot or notch shaped opening in the shaped distributor plate.

In a combustion apparatus including: a burner made up of a burner body and a sheet-metal combustion plate; and a combustion box which has a connection flange part to be coupled to a body flange part in a circumference of the burner body, the combustion box has disposed therein water passages as a cooling means, and a thermal insulation material which overlaps that portion of the combustion plate flange part which faces an inner space of the combustion box. A fixing plate for the thermal insulation material is attached to the combustion plate flange part. The fixing plate is provided with pressing claws for pressing in position the thermal insulation material so as to press and prevent the thermal insulation material from getting released away from the fixing plate. And water passages are disposed in a manner to contact the pressing claws.

In a combustion apparatus that includes a combustion plate having a burner frame with a shape of a picture frame, which covers an open surface of a burner body, and a frame flange part outwardly extending from a side plate part, which is sandwiched between a body flange part of the burner body and a box flange part of a combustion box, which is fastened to the body flange part, a projecting part(s) positioning the burner frame with respect to the combustion box, which comes into contact with, or comes close to and is disposed opposite to an inner surface of the combustion box is provided with the side plate part of the burner frame. Preferably, the projecting part(s) is provided at a portion away from an end of a side of an opening peripheral edge part of the side plate part to a side of the frame flange part.

The purpose of the present invention is to provide a smoke tube boiler which can prevent leakage of mixed gas and exhaust gas through a gap between a mix chamber and an ignition bar assembly. To this end, the smoke tube boiler according to the present invention comprises: a mix chamber having a mixing space, in which a combustion gas and air are mixed, and a flat plate type burner, the mix chamber being disposed on the upper side of a combustion chamber; an ignition bar assembly assembled to pass through one side of the mix chamber and extending across the upper portion of the combustion chamber to the lower side of the flat plate type burner; and a sealing means for preventing the mixed gas in the mixing space and an exhaust gas in the combustion chamber from leaking to the outside through a gap between the mix chamber and the ignition bar assembly.