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Regenerative oxidisers are used where there is a need to separate energy production from VOC or odour destruction. These units can cater for a wide range of effluent flow rates and are considered to be Best Available Control Technology.
Regenerative thermal oxidiser The oxidiser includes:
  • Effluent transfer fan with automatic control system,
  • Heat storage towers filled with ceramic material (2, 3 or 5 towers depending on operating criteria),
  • A system of automatic valves for effluent distribution through the towers (designed and manufactured by BABCOCK WANSON),
  • Combustion chamber with one or more modulating automatic gas/fuel burners,
  • Control panel PLC and operator interface panel.
Operating principle:
The VOC laden air from the process is drawn into the oxidiser by means of a motor driven centrifugal fan. The effluent is heated in the incoming tower, passed through the combustion chamber and cooled by the exit tower, each of which is filled with specialist ceramic material.
To achieve the best thermal oxidation of the VOC (Volatile Organic Compounds), the following conditions must be met:
  • temperature between 750 and 950°C,
  • dwell time of the effluent in the combustion chamber between 0.6 and 1 second,
  • adequate turbulence for efficient mixing of effluent and oxygen.
Regenerative thermal oxidiser schema
  • The effectiveness of the abatement of VOC emissions is equal to that of a recuperative thermal oxidisers, whilst the NOx emissions results are lower,
  • Continuous regulation of the emissions,
  • Simplicity of management,
  • Reduced maintenance,
  • Reduced gas/fuel consumption: the Regenerative oxidiser can achieve auto-thermal conditions with very low concentrations of VOC,
  • Self contained plant which does not produce waste heat for reuse in the production cycle and therefore does not need an additional heat distribution system,
  • Range from 4,000 to 150,000 Nm3/h.

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