Gas purification techniques

Regenerative thermal post-combustion

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

Beside systems with two or three ceramic fixed beds also other implementation forms are possibly. Two examples are a ceramic rotor and a moving bed. At a ceramic rotor turns a cylinder bed around its center. As that turns around the rotor he is alternatively warmed up and cooled down. At 'moving bed' recuperation the gas is sent upward through a bed of ceramic grains. The degasses in the bottom part are warmed up. In the middle of in the bed is itself to an open space with a support burner to ignite the gas. The smoke gases go further up in the bed and heat the bed above
the burner. By withdrawing grains below the bed and at the top to introduce sink back the bed ongoing and get one a ongoing reheating and cooling of the bed.
The advantages of regenerative thermally oxidizing are:

• No problems of corrosion of the exchanger (like at recuperative
  post-combustion) or poisoning of the catalyst metal or halogen (like
  at catalytic post-combustion)

• The gas flow are homogenized at passage by the bed

• Very pushed through energy recuperation: 85 - 95%

• Relatively low functioning costs

• Auto thermal functioning possibly at low VOC concentrations (as from 1
  2 g/m³ solvent)

• Very low rest concentrations possibly for VOC, NO_x and CO

The disadvantages are:

• High capital outlay

• Can hide the ceramic beds with substance and condensed particles

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

• Large scope and weight

• Much maintenance of the moving components

Regenerative post-combustion are especially applied at:

• High flows

• Low concentrations to VOC

• Ongoing functioning of the installation

• Smell removal from organic layer-charged gases

Sectors in which regenerative post-combustion becomes is applied:

• Printing

• Production of laminates

• Enamel industry

• Chemical industry

• Smell reduction at wood drying

• Ceramic industry

• Manure disposure

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