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Rotary furnace

Process description

The raw materials for mineral color pigment production and some special frits, are generally stored in silos and mixed in a pre-defined way. The mixed feed material is charged into the drum of an inclining rotary furnace and moves, during operation of the furnace, in countercurrent with the heat gases flowing from the burner to the off-gas outlet on the opposite side of the drum.

Gas application

Reasons for oxygen enhanced combustion are:

  • The nitrogen is eliminated from the combustion process
  • Exhaust gas volume reduced by 75%
  • Less heat loss through the exhaust system
  • Less batch loss by the lower exhaust velocity, less dust emission
  • Flue gas channel area can be reduced
  • Higher flame temperature
  • Better heat transfer by the 3 atom molecules taking place in the combustion
  • Better heat distribution
  • Higher pull rate and/or reduced fuel consumption

Oxyfuel combustion

In case of rotary furnace for both, the frit production and the color pigment production, the challenge is

  • to substitute the relatively large physical dimension of an air-fuel burner by an oxy-fuel burner, usually for giving the customers the possibility to switch back to air-fuel any time if they want, and/or
  • to substitute a water-cooled, oxy-fuel burner with self cooled burner which complies with the previous requirement.
  • define an optimum capacity of the burner
  • design a burner with optimum flame length on the above working point

Messer-solution

Oxipyr Burners

  • Oxipyr - F
  • Oxipyr - P / P LON

Oxipyr - Burner Regulation

  • Oxipyr - Advanced regulation
  • Oxipyr - Basic+, Basic regulation
  • Oxipyr - 400 regulation

The table shows the results of an optimisation process of an oxyfuel fired rotary furnace with Messer-Oxipyr P burners.

Results of the optimisation of an oxyfuel fired kiln