Efficient Exhaust Gas Treatment for Carbon Fibre Processes & Recycling

By admin October 13, 2012 7:59 am IST

Ecopure VAR systems made by Durr provide carbon fibre manufacturers a huge savings on the fuel requirement for their exhaust gas treatment and significantly lower operating costs
The use of carbon fibre and composite materials has significantly increased in the past few years and will further increase mainly to reduce the weight of airplanes, cars and wind turbine blades in order to reduce fuel consumption and increase efficiencies. For the production of carbon fibre a reasonable amount of heat energy is required for fibre oxidation ovens and carbonisation furnaces, and substances such as hydrogen cyanide (HCN), Ammonia (NH3), carbon monoxide (CO), tar and other VOCs are discharged from these ovens and furnaces, which can cause serious environmental pollution as well as danger to human health if they are not treated properly.
A technology that has already been installed by Dürr in the early days of carbon fibre production in 1988, and which is still in permanent operation, is the Ecopure VAR technology, a direct fired thermal oxidiser system.
A VAR system consists of a refractory lined oxidation chamber, a burner unit and injection nozzles and lances, through which the exhaust gas from the carbon fibre oxidation ovens and carbonisation furnaces is directly injected into the oxidation chamber. By a turbulent mixing of these gases and heating them up to high temperatures with the burner, more than 99.9 per cent of these pollutants are destroyed and oxidised into harmless water and CO2 vapours. The hot purified gas leaving the oxidation chamber can then be used for the production of steam or for heating thermal oil, hot water or fresh air that can be used as energy source for ovens and furnaces.
VAR Based on these early experiences, in the 1990s Dürr developed and installed a special burner system and a special method for injecting the various exhaust gases such that 99.9 per cent destruction and all the relevant emission limits in Europe, the United States and Asia would be achieved at oxidation temperatures around 850 – 900° C, whereas typical systems today still require temperatures of more than 1,100° C to achieve these limits. Even the formation of NOx is reduced to a minimum in the Ecopure VAR, and the NOx concentration in the purified gas stays below 20 ppm.
With such a burner technology the Ecopure VAR systems made by Dürr provide carbon fibre manufacturers a huge savings on the fuel requirement for their exhaust gas treatment and significantly lower operating costs.
Dürr provides Ecopure VAR systems for treating exhaust gases from oxidation ovens and carbonisation furnaces in one combined unit as well as systems just for the treatment of exhaust from carbonisation furnaces.

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