Linde launches innovative glass melting technology to reduce NOx emissions

[limg01]Linde Gases, a division of The Linde Group, today announced the launch of COROX® LowNOx a ground-breaking glass melting solution that will significantly reduce emissions of harmful nitrous oxides (NOx) in order to meet increasingly strict emission regulations set by the European Union (EU).

COROX® LowNOx is a unique fuel dilution and gas conditioning technology which employs special horizontal oxygen lances and oxyfuel burners to create atmospheric conditions within glass endport furnaces that result in substantially reduced NOx emissions. Via the high-pressure lances, additional oxygen is injected into the furnace to enhance recirculation of the furnace atmosphere, resulting in dilution of the combustion fuel and a more staged combustion process. Fuel dilution leads to a more homogenous flame and a reduction of the flame temperature itself – and as flame temperature directly influences levels of NOx emitted, fuel dilution has a significant reductive impact on emissions.

COROX® LowNOx will reduce NOx emissions to an impressive 500 mg/Nm3, exceeding new EU legislation requirements (European Union directive 2010/75/EU) introduced in March this year which will limit NOx emissions to 800 mg/Nm3 from 2013. Current enforceable limits are set at 1000 mg/Nm3.

"COROX® LowNOx is a major development for the glass manufacturing industry as it not only addresses the sector´s key environmental issue, but allows it to achieve its compliance goals reliably and in a cost effective manner" said Ulrich Hanke, Global Manager Marketing and Business Development, Metals and Glass, Linde Gases Division.

The lower flame temperature enabled by LowNOx´s fuel dilution capabilities also reduces the concentration of hydrocarbon radicals in the furnace, thereby reducing prompt NOx formation – and an improved heat transfer rate means process time under NOx forming conditions is also reduced. Additionally, by complementing oxygen lances with oxyfuel burners, endport furnace operators have the option to reduce their NOx emissions even further or increase melting capacity by 5-15 percent while still complying with EU regulations.

NOx is one of the main pollutants resulting from fossil fuel combustion - and when interacting with hydrocarbons and sunlight, it is responsible for ground-level ozone formation, acid rain and photochemical smog. NOx can also have harmful effects on the respiratory system of human beings and impair plant growth and increasingly restrictive legislation reflects the need for NOx emissions to be minimised or even mitigated.

COROX® LowNOx can be retrofitted onto existing endport fired furnaces with ease, and if needed, can increase the capacity of furnace making it the only solution on the market to do so.

Source: Linde AG/