Apparatus for radiant tube exhaust gas entrainment
First Claim
1. A radiant tube burner system for combusting fuel and combustion air, thereby forming flue gas, the radiant tube burner system comprising:
- a burner having a combustion air inlet, a fuel inlet, and a burner head, the burner adapted to convey combustion air and fuel from the combustion air inlet and the fuel inlet to the burner head for combustion;
a radiant tube receiving the burner head;
an exhaust conduit connected to the radiant tube, the exhaust conduit adapted to convey flue gas toward an exhaust outlet;
a blower adapted to generate a pressurized source of combustion air;
a combustion air conduit connecting the blower to the combustion air inlet, the combustion air conduit intersecting the exhaust conduit at a location fluidically between the radiant tube and the exhaust outlet; and
a venturi formed at an intersection between the combustion air conduit and the exhaust conduit, the venturi arranged to suction a portion of flue gas from the exhaust conduit into the combustion air conduit.
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Accused Products
Abstract
A radiant tube burner system comprises a novel flue gas recirculating assembly for reducing nitrous oxides emissions. In the burner system, the combustion air conduit running to the radiant tube burner intersects the exhaust conduit at a location between the radiant tube and the eventual exhaust outlet. A venturi is formed at this intersection. The venturi is configured to suction a portion of the flue gas from the exhaust conduit into the combustion air flow. The assembly includes a may be interposed along the exhaust conduit mounted directly between the radiant tube and a downstream section of the exhaust conduit.
30 Citations
17 Claims
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1. A radiant tube burner system for combusting fuel and combustion air, thereby forming flue gas, the radiant tube burner system comprising:
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a burner having a combustion air inlet, a fuel inlet, and a burner head, the burner adapted to convey combustion air and fuel from the combustion air inlet and the fuel inlet to the burner head for combustion; a radiant tube receiving the burner head; an exhaust conduit connected to the radiant tube, the exhaust conduit adapted to convey flue gas toward an exhaust outlet; a blower adapted to generate a pressurized source of combustion air; a combustion air conduit connecting the blower to the combustion air inlet, the combustion air conduit intersecting the exhaust conduit at a location fluidically between the radiant tube and the exhaust outlet; and a venturi formed at an intersection between the combustion air conduit and the exhaust conduit, the venturi arranged to suction a portion of flue gas from the exhaust conduit into the combustion air conduit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for introducing flue gas from an exhaust conduit into oxidant flowing in an oxidant conduit, the apparatus comprising:
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a tubular conduit section adapted to be interposed along the exhaust conduit, the tubular conduit section including a flue gas entrance port and a flue gas exit port, an oxidant entrance port and an oxidant exit port, the flue gas entrance and exit ports connected by a flue gas passageway for communicating flue gas through the exhaust conduit, the tubular conduit section further including a throat portion integral extending transversely relative to the flue gas passageway, the throat portion connecting the flue gas passageway to the oxidant exit port; and an oxidant inlet pipe extending through the oxidant entrance port, the oxidant inlet pipe terminating in a nozzle directed toward the oxidant exit port, wherein the flue gas passageway fluidically intersects the oxidant conduit. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification