Using Low-NOx Burners

Low NOx burners are specialized regenerative or recuperative burners that modify the fuel prior to combustion and then form and burn the soot in the flame. Increased heat transfer rates and decreased flame temperatures result in increased furnace production rates and thermal efficiency (Worrell et al., 2008. p.61).

Sorg LoNOx® Melter is one Low-NOx burner and was tested in a gas fired melter in a German container glass plant, and proved to be more energy efficient than regenerative, end-fired furnaces.

The Cleanfire™ low NOx burner by Air Products combines oxy-fuel burners with the elimination of nitrogen. The technology provides significant energy savings compared both to regenerative and recuperative furnaces. At the same time it reduces product impurities like stones and seeds and decreases flue gas emissions significantly (by around 80%).

ALGLASS FC is an oxy-oil burner developed by Air Liquide. It has a wide, low-NOx flame detached from the block, so that it has no hot spots, and a reduced flame temperature. While also reducing the NOx emissions, this technology demands very little maintenance due to the simplicity of the design. In addition, it decreases refractory wear and increases life of the furnace and reduces particulate emissions as flame momentum is low and therefore alkali volatilization is decreased compared to a conventional burner. 

WideFlame™ burner from Praxair is another alternative with demonstrated energy savings and emission reductions.

Energy Saving Denox (EsDeNOx) is also proven to reduce energy consumption and NOx emissions by controlling air consumption and flame turbulence (Worrell et al., 2008. pp. 61-62)

Development Status Products

Using Low-NOx BurnersCosts & Benefits

Parent Process: Melting and Refining
Energy Savings Potential

The LoNOx® Melter with cullet preheating consumes 3.23 GJ/t of energy, 14.4% less than regenerative end-fired furnaces. 

Cleanfire burners are reported to reduce energy consumption by 40% and 20% compared to recuperative and regenerative furnaces, respectively. 

For one manufacturer WideFlame™ has saved 6.1% of energy over previous models. 

The energy savings that can be achieved with EsDeNOx system are up to 5% for natural gas fired furnaces and range from 2 to 7% for oil-fired furnaces (Worrell et al., 2008. p.62).

CO2 Emission Reduction Potential

Quantitative data not available.


The payback time for EsDeNOx system is reported to be less than one year (Worrell et al., 2008. p.62).

Using Low-NOx Burners Publications

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