Fibers are used in the aircraft industry, in the manufacturing of golf equipment, tennis rackets, and other sporting equipment. Additional products and everyday materials containing fiber are air bags, a base material for Bitumen coated roof mats, automotive parts, and for insulation material.
Conditions: Applications with pre-oxidation ovens with medium exhaust air flows around 20,000 Nm³/h at approx. 250°C containing about 1 g/Nm³ of HCN and NH3.
Applications with carbonization ovens – one low temperature at approx. 400°C and one high temperature at approx. 600°C – both with low exhaust flows of approx. 700 Nm³/h, low oxygen, but high concentrations of HCN and NH3. Exhaust air may contain some carbon fiber dust and sometimes, silicone products from the fiber pre-cursor. In addition, sometimes inlet and outlet hoods from the ovens need to be treated as well which have large air volumes with low HCN and NH3 concentration.
Abatement System Recommendation: Dürr recommends the Ecopure® VAR Direct Fired Thermal Oxidizer with waste heat recovery for heating the pre-oxidation ovens and pre-heat of the pre-oxidation exhaust air. Exhaust gas from carbonization ovens are injected directly next to the burner.
Conditions: Normally medium air flows around 15,000 to 70,000 Nm³/h with low concentrations of sometimes Methanole, CO, Formaldehyde and others.
Abatement System Recommendation: For this application, recommends the Ecopure® RTO Regenerative Thermal Oxidizer or Ecopure® RL rotary Regenerative Thermal Oxidizer.