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Preheater and Calciner

 

 

 

The ZEMDES cyclone preheaters an calciners are designed modular and allow a consistently process oriented figuration by combining the different modules. In later changing of conditions, ZEMDES cyclone preheaters can be adapted to the respective conditions by exchanging or adding modules.

 

 

ZEMDES cyclone preheaters could be one- or more-stringed. The one-stringed execution is used up to a capacity of 5.500 tpd. For larger capacity, the cyclone preheaters are usually two-stringed. Depending on requirements of raw material drying, there are used 4-, 5- or 6-stage cyclone preheater.

 

 

The 1st stage (top stage) of each preheater is a module WEZ.D. The module WEZ.D is a double cyclone, designed as dedusting cyclone.

 

Characteristic features of the ZEMDES-dedusting cyclones are:

 

  • One of the dip tube undisturbed inlet flow
  • A long immersion depth of the dip tube
  • A diameter ratio of cyclone and dip tube of 2: 1
  • 270° inlet spiral with an inclined bottom area
  • A cyclone cone with 70° wall inclination

 

 

 

For the process cyclones of the stages 2 up to 6, modules of the type WPZ are used. The modules of the type WPZ are process cyclones, which are optimized in their geometry concerning high filtration efficiency and low pressure drop.

 

Characteristic features of the ZEMDES process cyclones are:

 

  • One of the dip tube undisturbed inlet flow
  • An immersion depth of the dip tube of about 50% of the height of the inlet spiral
  • A diameter ratio of cyclone and dip tube of about 1 : 0,58
  • 270° inlet spiral with an inclined bottom area
  • A cyclone cone with 70° wall inclination

 

 

The selection of the modules results based on each stage of the calculated quantity of gas.

 

 

 

The ZEMDES calciners are stream-duct reactors. Depending on the size ofthe plant, one or two calciners are used. All ZEMDES calciner can be equipped with a Low-NOx Module and / or a combustion chamber. The Low-NOx Module operates on the principle of staged combustion. The Low-NOx Module operates on the principle of staged combustion.

 

Based on modular design, a further upgrading can also be made by relatively minimal effort.

 

The basic concept of the flow tube reactor offers a high stage of operational safety and combines thereby a simple design with high flexibility at changes of process parameters. The particular design of the deflection at the top of the calciner provides disintegration of any possible remaining streak and for a complete mixing of raw meal, gas and fuel. This is the precondition for complete combustion and an optimum heat transfer between gas and solids up to entering the lowest cyclone stage. Degrees of calcination of the raw meal can be achieved up to 95%.

 

 

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