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Study on the Separation Characteristic of a Cyclone Separator with Different Inlet Section Angles

Author: HuangXingZuo
Tutor: QianFuPing
School: Anhui University of
Course: Environmental Engineering
Keywords: Cyclone Inlet section angle Numerical Simulation Experiment Separation efficiency model
CLC: TQ051.8
Type: Master's thesis
Year: 2009
Downloads: 78
Quote: 0
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Abstract


Cyclone as a gas-solid separation equipment, because of its simple structure, high efficiency, high temperature and high pressure, has a wide range of applications in the energy, chemical industry, metallurgy, environmental protection, and many other fields. Cyclone successful application of PFBC (Pressurized Fluidized Bed Combustion) IGCC (Integrated Gasification Combined Cycle), CFBC (circulating fluidized bed combustion) and FCC (FCC) unit. In these harsh operating conditions, a cyclone is only one commercial application of the dust removal and separation equipment. However, the cyclone main disadvantage is the lower the particle removal efficiency of particle size less than 5μm. In order to effectively improve the separation efficiency of the cyclone, starting from the angle of structural improvements, the first detailed analysis of the numerical simulation method inlet section angle were 0 °, 30 ° and 45 ° of cyclone within the three-dimensional two phase jet flow in two ways through experiments and mathematical model for three cyclone particle separation performance to do further research. Numerical simulation of the process, the gas field using the Reynolds stress transport model (RSTM), reflects the anisotropic turbulence equations convective term QUICK difference scheme with second order accuracy. Phase calculation of the particles using the model of a discrete phase, and control the inlet velocity and the particle concentration in the three cases are the same. Which is more conducive to change the angle of the inlet section of the internal flow field changes only contrast cyclone in other conditions remain unchanged. In addition, the establishment of a small experimental station, produced three analog exactly the same size model of the cyclone inlet particle concentration is controlled through the use of the same, only changing the inlet velocity, cross-section of the three entry angle cyclone separation performance in different conditions and test results show that, as the entry angle increases, the efficiency can be increased by more than 5%, and the body's resistance losses can be reduced by 10% or more. Finally, based on the response surface methodology to establish the different inlet section angle of the bottom of the core tube short circuit flow model based on cyclone classification efficiency for different inlet section angle mathematical model based on the boundary layer separation theory. The model reflects the entry angle core tube insertion depth and the diameter of the core tube three cyclone separation performance of great significance for the further study of the separation efficiency of the cyclone of different inlet angle and structural dimensions. Above is used different inlet section angle cyclone separation performance in three ways, by comparing the results, has basically reached the intended purpose of the subject is raised: with conventional tangential inlet cyclone. ratio has a certain inlet section angle cyclone separation efficiency has been significantly improved, and the core tube at the bottom of the short-circuit flow and loss of body resistance decreased

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical machinery and apparatus, equipment > Chemical process machinery and equipment > Material separation machinery
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