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Alkali Regeneration

Process description

During liquor recovery, thick liquor is concentrated and burned. Green liquor is a by-product of this process, and is fed into the subsequent causticization.

Gas application

Air consists of 78 % nitrogen, 21 % oxygen, just less than 1 % argon and other gases. In combustion processes that use air as an oxidant, the high nitrogen content is a limiting factor, since a portion of the energy generated is only used for heating of the inert gas and is therefore lost to the process.

The addition of oxygen to an air stream increases the oxygen concentration and thus at the same time improves the firing efficiency of the combustion. The technology of oxygen addition in combustion processes is flexible and can be applied to almost all types of furnaces, such as shaft furnaces, rotary drum ovens, grate firing ovens, fluidized bed ovens, deck ovens, etc.

Oxygen enrichment leads to

  • Significantly increased capacities
  • Reduction in energy use
  • Optimisation of the entire process

Messer solution

In order to exploit the full potential when burning the thick liquor, it is necessary to generate a homogeneous gas mixture over the shortest possible route. This is possible with the OxyCone gas injector from Messer.

Advantages are:

  • Reliable homogeneous oxygen concentration 
  • Maximum utilisation of the advantages of the oxygenation process in the combustion zone.
  • Avoidance of improper mixing with excessive oxygen concentrations and local overheating (hot spots).