Preheater Cyclone Modification and Main Components

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 Preheater Cyclone Modification and Main Components


   Low- pressure drop 

Reduction in pressure drop of the gas is partly achieved by large inlet area and outlet area for a given cyclone size and partly by providing more space for the gas flow in the top part of the cyclone.

Due to this geometry the inner pipes can be shorter to decrease the resistance in the system and in the same time still the separation efficiency of the cyclone will achieve the needed rate.

Pressure drop will be between 5 to 15 mbar depending on dimension of the cyclone and on its type but modern preheater are designed with total pressure-  drop of 35 m bar through out the total preheater.

-         Preheater string consists of four or five or six cyclones called stages and these cyclones are a reversed flow cyclones with a vertical axes   

As a rule the higher the number of preheater stages, the lower will be the drying capacity of this modern kiln system -with cyclone preheater and Precalciner.

-         Each of these cyclones is mounted on the other and forming what is called preheater string with total height of preheater ranging from 60 to 110 m.

-         Preheater can be made of one string for production of not more than 6000 tpd clinker and two strings up to 10000 ton of clinker/day or more.

-         Each stage in single string preheater is made of single cyclone except for upper most cyclones it is mostly made of twin cyclones for better heat exchange and separation efficiency.

-         A basic preheater consists of:

Cyclone vessels, material pipe (hot meal pipes), gas ducts (riser ducts), expansion joint, flap gates, splash plates and inner pipes.

-         Temperature and pressure gradient in 5 stages preheater are as follow







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