| 摘要 |
A method and apparatus for reducing the temperature of the recirculated flue gas in a flue gas recirculation duct for burners in industrial furnaces such as those used in steam cracking. The apparatus includes a burner tube having a downstream end and an upstream end for receiving air, flue gas and fuel gas, a burner tip mounted on the downstream end of the burner tube adjacent a first opening in the furnace, so that combustion of the fuel takes place downstream of the burner tip; at least one passageway having a first end at a second opening in the furnace and a second end adjacent the upstream end of the burner tube, the passageway having an orifice in fluid communication with a source of air which is cooler than the flue gas; and a mechanism for drawing flue gas from the furnace through the passageway and air from the orifice of the passageway in response to an inspirating effect created by uncombusted fuel flowing through the burner tube from its upstream end towards its downstream end, whereby the flue gas is mixed with air from the orifice of the passageway prior to the zone of combustion of the fuel to thereby lower the temperature of the drawn flue gas.
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