Gas purification techniques

Regenerative catalytic post combustion

This is a combination of catalytic post-combustion with regenerative heat recuperation.

The alternatives described at the regenerative thermal and catalytic post-combustion also applies to this technique.
The advantages of regenerative catalytic post-combustion are:

• No problems with corrosion of the exchanger

• Homogenization of the gas flow in the bed

• Energy recuperation far pushed through

• Relatively lower functioning costs

• More compactly than thermal oxidation

• Lower oxidation temperature so that less support fuel is necessary

• Low NO_x production; approximately 20 - 30% of the NO_x at thermal post-combustion

• CO are destroyed with the other components

• High constant and reliable performances possible

• By the low temperature less heat insulation has been required than
  at thermal post-combustion

• More lower fire risk with respect to thermal oxidation

The disadvantages are:

• More lower output for VOC disposal than thermal oxidation

• System are sensitive for changes in energy-input of the gas

• Risk of dioxin shaping connections chlorinated at presence of

• All catalysts are liable to catalyst far grants and polluting
  substances.

• Substance must be removed for post-combustion

• Deactivated catalyst can be regenerated not but must be removed.

• High investment costs

• Can hide the ceramic beds

• At discontinue functioning must be again warmed up the bed every
  time

• Large scope and weight

• Much maintenance of moving parts

In most of the cases thermal regenerative system are placed instead of
catalytic since the thermal output is already very high. A catalytic system is in comparison more expensive.

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