Nitrogen oxide control using internally recirculated flue gas

Combustion – Combustion products return structure – Recirculation about mixing or combustion chamber wall or baffle

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431115, 431 9, F23L 900

Patent

active

050449320

ABSTRACT:
An improved process and apparatus for reducing NO.sub.x content of flue gas effluent from a furnace, the improvement comprising a burner assembly having a burner and flue gas recirculating system for collecting and passing internally recirculating flue gas into a combustion zone for reaction with a combustion flame. The burner preferably has a plurality of fuel dispensing nozzles peripherally disposed about the combustion zone to aspirate collected internally recirculating flue gas into the combustion zone, and has a plurality of fluid driven eductors to drive further amounts of collected internally recirculating flue gas into the combustion zone.

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Control of Nitrogen Oxides in Boiler Flue Gases by Two-Stage Combustion, by Donald H. Barnhart and Erle K. Diehl, Journal of the Air Pollution Control Association, Oct. 1960.

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