| Gas-solid centrifugal separation and exhaust equipment(referred to as AIO) innovative put the centrifugal fan in the cyclone separator. Previous research has shown that AIO have strong ability to capture ultrafine particles, however the pressure drop of separation cylinder of combinational machine is too large, the total pressure of centrifugal impeller is small, and it can’t realize gas transport function, so we need to redesign the structure to increase the total pressure of centrifugal impeller. This article attempts to improve the design of impeller blades to improve the energy for the centrifugal impeller and compare with the former machine without it.CFD was used to study on the gas-solid flow field in the model, including flow field and separation performance. Main tasks and results are as follows.(1) Select axial flow fan and impeller centrifugal as a direction to improve the working capacity. Use CF-turbo software to design the centrifugal impeller modeling, using MATLAB and Solid Works modeling to build axial flow fan model. Choose suitable working segment for AIO:The original mode(A) with the distortion impeller centrifugal model(B);Original model(A) and axial flow fan model(C); axial flow fan model(C) and add the model of axial flow and twisted impeller(D).(2) Through simulation we found that model(B) can effectively improve AIO flow field, but did not increase the working capability of centrifugal impeller, axial flow fan and centrifugal fan matching is not successful, the later research should also continue.(3) The distortion impeller centrifugal can greatly improve the work ability of AIO, the total pressure increased by 18.7%, but the pressure drop has also increased, we should to improve the working capacity and at the same time reduce the pressure drop.(4) Discrete Random Walk model was used to simulate the solid phase in the model machine, and the results demonstrate that Integrated rotate cyclone separator has good separation performance for ultrafine particles. |
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