Cyclone

CYCLONE PERFORMANCE ANALYSIS.


A cyclone separator is a device, which causes centrifugal separation of materials in a fluid flow. Unlike the slow settling of particles within a settling tank, a cyclone separator system yields fast separation and utilizes less space. Separation occurs quickly because one “g” of the gravitational force is replaced by multiple “g” of the acting centrifugal force. The material to be separated can consists of solid particle or liquids, i.e. droplets, which are classified according to size, shape and density.

 

The cyclone utilizes the energy obtained from the fluid pressure gradient to create rotational fluid motion. This rotational fluid motion causes the dispersed phase to separate relatively fast due to the strong acting forces. In widely used reverse flow cyclones of the cylinder on the cone design type gases spiral down from a tangential inlet towards the apex of a conical section, where the flow is reversed and the particles are collected in a hopper. The continuous phase then proceeds upwards in an inner core flow towards the gas exit via the vortex finder.
Cyclone analysis for cement industry  
   
Cyclone designs have been developed over many years since their invention. Now a days, there exit a numbers of different types for various industrial applications. Many attempts have been made to improve the performance of cyclone by modifying their shape in terms of ration of different key dimensions. CFD is one of the tool to design high efficiency cyclones.
 

Cyclone analysis for cement industry


CFD simulation provides detailed information of fluid flow. Ansys CFX and Fluent have the capability to do particle tracking, which is used for calculating separation efficiency. The pressure drop across the cyclone and fractional efficiency curve are well agreed with experimental results.

 

Flow pattern inside the cyclone separator


Tangential velocity Axial velocity