A gas burner system has a gas burner with a conduit through which an air-gas mixture is conducted; a variable-speed forced-air device that forces air through the conduit; a control valve that controls a supply of gas for mixture with the air to thereby form the air-gas mixture; and an electrode configured to ignite the air-gas mixture so as to produce a flame. The electrode is further configured to measure a flame ionization current associated with the flame. A controller is configured to actively control the variable-speed forced-air device based on the flame ionization current measured by the electrode so as to automatically avoid a flame harmonic mode of the gas burner. Corresponding methods are provided.

High intensity combustion and low intensity combustion are carried out together, to stabilize flames and to hold down the emission of carbon monoxide. An air-fuel mixture outlet member (back plate) that includes a single or a plurality of outlet(s) (air-fuel mixture outlet(s)) out of which an air-fuel mixture (GA) flows is included, and a metal fiber knitting body (metal knit) that covers the air-fuel mixture outlet member is included. Therefore, the air-fuel mixture, which is made to flow out of the outlet(s), passes through the metal fiber knitting body (metal knit) and is combusted, a flame of low intensity is generated together with a flame of high intensity by combustion of the air-fuel mixture, and the flame of low intensity holds the flame of high intensity.

A surface burner for gas combustion has a burner surface which is fabricated by intertwining or interweaving an elongated flexible element across a distinct burner frame. This fabrication method can be best referred to as braiding, but also plaiting, lacing or another comparable method.

A burner resonance canceling apparatus adapted to cancel a resonance caused in a burner tube having a side wall, apertures disposed on the side wall, a first end configured for receiving a fuel mixture flow, a closed second end, a central axis extending through the first end and the second end, the apparatus includes a member having an enlarged end, a reduced end and a central axis extending through the enlarged end and the reduced end, wherein the enlarged end is configured to be positioned at the second end, the central axes are substantially coaxially disposed and the reduced end is configured to face the fuel mixture flow brought through the first end into the burner tube and the burner tube and the member cooperate to define a chamber the fuel mixture flow is configured to traverse from the reduced end to the enlarged end.

A catalytic flameless combustion apparatus has a fuel inlet, a combustion-supporting gas inlet, a gas premixer, a combustion plate, an igniter, a gas deflector, a flameless combustion cavity, a catalyst filled in the flameless combustion cavity, a gas collection chamber and an exhaust port. The method for starting the catalytic flameless combustion apparatus includes initially combusting and heating the flameless combustion cavity and the catalyst filled therein with low power flame; and then increasing flow velocity and switching to high power flame for conducting catalytic flameless combustion. The catalytic flameless combustion apparatus can be used for various non-solid fuel combustion and heat extraction processes.

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 totally aerated combustion burner has: a burner body which is supplied therein with air-fuel mixture; and a combustion plate part which covers an open surface of the burner body. The combustion plate part is constituted by: a burner frame in a shape of a picture frame; a metal-fiber knit which is disposed to cover, from a burner-body side, 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. Only the metal-fiber knit is spot-welded to that opening peripheral part of the burner frame which is positioned on a same surface as the opening. The distribution plate is spot-welded to that portion of the burner frame which is offset from the opening peripheral part toward the burner-body side.

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.

High intensity combustion and low intensity combustion are carried out together, to stabilize flames and to hold down the emission of carbon monoxide. An air-fuel mixture outlet member (back plate) that includes a single or a plurality of outlet(s) (air-fuel mixture outlet(s)) out of which an air-fuel mixture (GA) flows is include, and a metal fiber knitting body (metal knit) that covers the air-fuel mixture outlet member is included. Therefor, the air-fuel mixture, which is made to flow out of the outlet(s), passes through the metal fiber knitting body (metal knit) and is combusted, a flame of low intensity (flame) is generated together with a flame of high intensity (flame) by combustion of the air-fuel mixture, and the flame of low intensity holds the flame of high intensity.

The burner (100) comprises a cylindrical porous substrate (110); and an end cap (130) at a first end of the cylindrical porous substrate (110). The cylindrical porous substrate (110) is provided for flow of a premix of combustible gas and air from the outside of the cylindrical porous substrate (110) through the pores of the cylindrical porous substrate (110) to an interior cavity (140), for the combustible gas to be combusted on the inner surface of the cylindrical porous substrate (110) thereby generating hot gas. The burner has an opening (182) at the second end of the cylindrical porous substrate (110) to exit the hot flue gas out of the interior cavity (140). The cylindrical porous substrate (110) has a higher permeability section (170), located at the opening (182) at the second end. The higher permeability section (170) has a lower resistance to gas flow than other sections of the cylindrical porous substrate (110).