Apparatus for radiant tube exhaust gas entrainment
AssigneeEclipse, Inc.
InventorDavid Collier
Life of this patent
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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.
Claims17
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.
An apparatus for introducing flue gas from an exhaust conduit into oxidant flowing in an oxidant conduit, the apparatus comprising:
- 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.
Dependencies are inferred from the claim text.