Abstract-Based on flue gas inner recirculation technology, a low NO x 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 NO x 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 NO x and CO were experimentally investigated. This newly developed combustion technologies showed very low NO x emission level, about 12 ppm when light oil was used as a fuel and about 18ppm when LNG was used as a fuel.

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