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—Based on flue gas inner recirculation technology, a low NOx gas burner was developed and tested in a real scale industrial boiler. Some parts of combustion gases were recirculated in the combustion chamber and mixed with combustion air in the burner by its structural characteristics. And a noble low NOx combustion technology, based on partial oxidation combustion concept in a fuel rich combustion zone, was successfully applied in liquid burner. The burner was designed such that a portion of fuel is heated and pre-vaporized in the furnace then injected into a fuel rich combustion zone so that a partial oxidation reaction occurs. The effects of equivalence ratio, thermal load, and fuel distribution ratio on the emissions of NOx and CO were experimentally investigated. This newly developed combustion technologies showed very low NOx emission level, about 12 ppm when light oil was used as a fuel and about 18ppm when LNG was used as a fuel.

An Experimental Study on Industrial Boiler Burners Applied Low NOx Combustion Technologies