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Structure Optimization of Cyclone Separator with Radial-Inlet in Preliminary Syngas Purification Pro

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Tutor: ChenXueLi
School: East China University of Science and Technology
Course: Chemical processes
Keywords: cyclone separator,structural optimization,numerical simulation,vortex core,paral
CLC: TQ051.8
Type: Master's thesis
Year:  2012
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Abstract:
Radial-inlet cyclone separtaor is the key equipment used in syngas preliminary purification process. The structure of the cyclone was optimized, and vortex core and the flow field characteristics of the cyclone ware also studied systematically by experiment and numerical simulation.The flow field of the cyclone was measured with five-hole probe, and the basic distribution of flow field of the cyclone was obtained, which provided effective data for the validation of numerical simulation.Numerical simulations of cyclone separators with various geometries were performed to optimize its structure. Based on response surface methodology, prediction models of the pressure drop and the separation efficiency for particle with diameter of 1¦Ìm were obtained by using the statistical software program. The results showed that vortex finder diameter and inlet angle have significant effects on the cyclone performance and also have strong interactions on the separate performance of cyclone separator. Optimum structure which has both minimum pressure drop and maximum separation efficiency has been obtained.Numerical simulation of the flow field of cyclone separators is presented by Large Eddy Simulation (LES), it¡¯s found that the phenomenon of vortex core precession exists in separation space of cyclone. Operating conditions and structural parameters have different effect on vortex core precession frequency of cyclone on different axial height. The difference of profile of vortex core and axial velocity is notable. The asymmetry characteristics is found in whole flow field of cyclone, the instability decreased with increasing swirl number, which weakened the degree of asymmetry of flow field.Comparing with the cyclone which diameter is 3000 mm, the cyclone which combining with four cyclones with diameter of 1500 mm has higher separation efficiency and lower pressure drop.
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