Gas purification techniques

Recuperative Thermal post-combustion

Beside the alternative of injection in an existing kettle such as described with thermal post-combustening the there also varieties with exchangers possible namely with a plate exchanger or a pipe exchanger. Plate exchanger has a high output and is cheaper than a pipe exchanger. Plate exchangers can be built modular so that the obtained efficiency can be adapted easily dependent on the number of plates that is used. At temperatures above 540 °C pipe exchanger become cheaper than
plate exchangers. Pipe exchanger are structurally more reliable than plate
exchangers.
The advantages of recuperative thermally oxidation is:

• By the application of heat recuperation strongly will reduce the
  functioning costs for fuel

• Robust technique with a high efficiency

The disadvantages are:

• can pollute the exchanger at high substance qualities

• Hot side of the exchanger liable to much maintenance due to corrosion and
  mechanical tensions by the high temperature

• Risk on spontaneous combustion at very high VOC concentrations if
  the gases come in the exchanger above the spontaneous combustion
  temperature

Recuperative thermal post-combustion can be applied at:

• Mainly flows smaller than 50,000 m³

• Higher hydrocarbon concentrations to limit the fuel charges also not too high owv the due to the risk on spontaneous combustion

• At discontinue functioning of production

Recuperative post-combustion are used in the production of
expanding foam where the degasses are loaded heavily with VOC. At introducing to glue and covers the combination of regenerative adsorption is followed by recuperative thermal post-combustion applied
at low solvent concentrations, high flows and when production continuous is not.
If production continuous is regenerative thermal post-combustion are
rather placed because this has a higher thermal output and lower
maintenance - and energy costs.

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