Industrial furnace and a burner for conducting regenerative combustion and a combustion method therefor
AssigneesToyota Jidosha Kabushiki Kaisha, Nippon Furnace Kogyo Kaisha, Ltd.
InventorsKazuhisa Mitani, Tomohiko Nishiyama, Ryoichi Tanaka
Life of this patent
Estimating the term…
Abstract
An industrial furnace and a burner for regenerative combustion includes a heat storage member, a switching mechanism disposed on one end of the heat storage member, and a burner tile disposed on the opposite end of the heat storage member. The burner tile has a protruding portion extending ahead an air supply and gas exhaust surface. The switching mechanism has a stationary disk and a rotatable disk which slidably contacts the stationary disk. A speed of supply air to the furnace is in operation equal to or higher than a speed of exhaust air therefrom.
Claims80
An industrial furnace comprising:
- a heat storage member having an axis and comprising a plurality of independent sections which are separated from each other along a circumferential direction of said heat storage member;
- a burner tile provided on one side of said heat storage member, said burner tile including a fuel injection nozzle insertion hole, and an air supply and gas exhaust surface including a plurality of gas flow holes constructed and arranged to selectively permit supply air and exhaust gas to pass therethrough;
- and
- a switching mechanism disposed on a side of said heat storage member opposite from said burner tile, said switching mechanism including a stationary disk, a rotatable disk slidably contacting said stationary disk, and a partitioning wall separating a supply air flow area and an exhaust gas flow area, wherein said stationary disk includes a plurality of apertures, said rotatable disk including a plurality of openings for gas flow which are openable and closable in accordance with rotation of said rotatable disk, said plurality of openings including at least one supply air flow opening communicating with said supply air flow area located on one side of said partitioning wall and at least one exhaust gas flow opening communicating with said exhaust gas flow area located on a side of said partitioning wall opposite said supply air flow area, and wherein said heat storage member, said burner tile, and said switching mechanism are independent from each other.
An industrial furnace comprising:
- a burner tile including:
- an air supply and gas exhaust surface including a plurality of gas flow holes constructed and arranged to selectively permit supply air and exhaust gas pass therethrough;
- a protruding portion extending away from said air supply and gas exhaust surface and having an interior surface;
- and
- a fuel release surface for releasing injected fuel, the fuel release surface being formed on said interior surface and extending to a front end of said protruding portion opposite said air supply and gas exhaust surface.
A burner comprising:
- a heat storage member including a plurality of independent circumferential sections;
- a burner tile disposed on one side of said heat storage member, said burner tile including a fuel injection nozzle insertion hole, an air supply and gas exhaust surface including a plurality of gas flow holes constructed and arranged to selectively permit supply air and exhaust gas to pass therethrough;
- and
- a switching mechanism disposed on the other side of said heat storage member from said burner tile, said switching mechanism including a stationary disk, a rotatable disk slidably contacting said stationary disk, and a partitioning wall defining a supply air flow area and an exhaust gas flow area, said stationary disk including a plurality of apertures, said rotatable disk including a plurality of openings for gas flow which are openable and closable in accordance with rotation of said rotatable disk, said openings including at least one supply air flow opening communicating with said supply air flow area located on one side of said partitioning wall and at least one exhaust gas flow opening communicating with said exhaust gas flow area located on the other side of said partitioning wall.
A burner comprising:
- a burner tile including:
- an air supply and gas exhaust surface including a plurality of gas flow holes constructed and arranged to selectively permit supply air and exhaust gas to pass therethrough;
- a protruding portion having an interior surface extending away from said air supply and gas exhaust surface;
- and
- a fuel release surface for releasing injected fuel and formed on said interior surface of and extending to an end of said protruding portion distal to said air supply and gas exhaust surface.
In a furnace including a burner tile having an air supply and gas exhaust surface and a plurality of gas flow holes formed therethrough, the plurality of gas flow holes being constructed and arranged to selectively permit either a supply air or an exhaust gas to pass therethrough, the furnace further including a protrusion portion having an interior surface and extending away from the air supply and gas exhaust surface, and a fuel release portion provided on the interior surface of the protrusion portion, a combustion recirculation method comprising the steps of:
- supplying the supply air into the furnace through at least one of the plurality of gas flow holes selectively acting as a supply air flow hole;
- directing the supply air so as to draw and entrain a portion of burnt gas derived from operation of the furnace, the supply air flowing along an interior surface of the protruding portion in a direction away from the air supply and gas exhaust surface, thereby recirculating burnt gas in the furnace;
- and
- mixing additional supply air and the recirculated portion of burnt gas with fuel released from the fuel release portion, flowing the mixture of additional supply air, recirculated burnt gas, and fuel away from the protruding portion and the air supply and gas exhaust surface.
Dependencies are inferred from the claim text.