The Experts below are selected from a list of 4350 Experts worldwide ranked by ideXlab platform
Jianjun Wang - One of the best experts on this subject based on the ideXlab platform.
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performance evaluation of a new Cyclone Separator part ii simulation results
Separation and Purification Technology, 2016Co-Authors: Weiwei Xu, Qiang Li, Jianjun WangAbstract:Abstract A novel vortex finder (slotted vortex finder) was designed to improve Cyclone Separator performance. The gas flow in axial-inlet Cyclone Separator with the novel vortex finder is simulated by means of Reynolds Stress Model (RSM). The computational results of the flow patterns in Cyclone Separator are compared with the experimental ones, and the results show that RSM offers a robust, reliable modeling option for such flows. Three dimensional gas flow simulation results indicate that the gas flow exits the Separator through two pathways. One part of the gas spirals down from outer annular space to outer separation space and dust hopper, then spirals upward in the inner part of Separator, and finally exits the Separator. The other gas flow enters the vent pipe through the slots in vortex finder rather than entering the separation space. The simulation results show that the latter part flow accounts for 54% of the total gas flow. Diversion of gas pathways has three advantages. Firstly, the 54% of the gas–solid flows can be separated by slots due to the novel vortex finder. Secondly, the results also indicate that there are almost no short circuit flows under the inlet of the slotted vortex finder. Thirdly, the slotted vortex finder reduces the flow swirling intensity and undesired instabilities, and thus the slotted vortex finder can reduce pressure drop.
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Coupling Vibration Investigation of Cyclone Separator Interacted With Unsteady Fluid
Journal of Pressure Vessel Technology-transactions of The Asme, 2015Co-Authors: Qiang Li, Weiwei Xu, Jianjun WangAbstract:Gas–Cyclone body coupling vibration is one kind of vibration caused by air pulsation. This coupling vibration causes widespread damage and deformation of three-stage Cyclone Separator used in residue fluid catalytic cracking. After theoretically analyzing the mechanism of the generation of the gas–Cyclone body coupling vibration, the numerical simulation of three-dimensional swirling flow the Cyclone Separator was performed by using Reynolds stress model (RSM). The results showed the existence of precessing vortex core (PVC) in the Cyclone Separator. The PVC phenomenon and motion of PVC were described in detail. Furthermore, the amplitude and frequency of gas fluctuation in the PVC region at different axial positions were quantitatively analyzed. The simulation results agreed with the experimental results of laser Doppler velocimetry (LDV). Finally, characteristics of PVC in Cyclone Separator with a novel vortex finder were designed, and the results showed that the novel vortex finder can reduce flow vibration.
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performance evaluation of a new Cyclone Separator part i experimental results
Separation and Purification Technology, 2015Co-Authors: Qiang Li, Weiwei Xu, Jianjun WangAbstract:Abstract This paper presents the gas flow characteristics of a guide-vane-inlet Cyclone Separator with a novel vortex finder. The new design is based on the idea of increasing Cyclone efficiency and reducing pressure drop by improving vortex finder structure. Instead of traditional vent pipe, the vortex finder is slotted on side wall. A model of Cyclone with this novel vortex finder has been manufactured and tested. Total collection efficiency, grade collection efficiency and pressure drop were measured at various flow rates. Experimental results show that the novel vortex finder can increase particle collection efficiency and reduce pressure drop.
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Coupling Vibration Investigation of Cyclone Separator Interacted With Unsteady Fluid
Volume 4: Fluid-Structure Interaction, 2014Co-Authors: Qiang Li, Youhai Jin, Ying Guo, Weiwei Xu, Jianjun Wang, Ying WangAbstract:Gas-structure coupling vibration is one kind of vibration caused by air pulsation. This coupling vibration causes widespread damage and deformation of three-stage Cyclone Separator used in Residue Fluid Catalytic Cracking (RFCC). After theoretically analyzing the mechanism of the generation of the gas-structure coupling vibration, the numerical simulation of three-dimensional swirling flow the Cyclone Separator was performed by using Reynolds Stress Model (RSM). The results showed the existence of processing vortex core (PVC) in the Cyclone Separator. The PVC phenomenon and motion of PVC were described in detail. Furthermore, the amplitude and frequency of gas fluctuation in the PVC region at different axial positions were quantitatively analyzed. The simulation results agreed with the experimental results of Laser Doppler Velocimetry (LDV). Finally, considering the characteristics of transient torsional pendulum of PVC in Cyclone Separator, the fluid-solid coupling dynamic characteristics of three-stage Cyclone Separator were analyzed by the finite element method, which provides references for the structure optimization design of new type Cyclone Separator.
Qiang Li - One of the best experts on this subject based on the ideXlab platform.
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performance evaluation of a new Cyclone Separator part ii simulation results
Separation and Purification Technology, 2016Co-Authors: Weiwei Xu, Qiang Li, Jianjun WangAbstract:Abstract A novel vortex finder (slotted vortex finder) was designed to improve Cyclone Separator performance. The gas flow in axial-inlet Cyclone Separator with the novel vortex finder is simulated by means of Reynolds Stress Model (RSM). The computational results of the flow patterns in Cyclone Separator are compared with the experimental ones, and the results show that RSM offers a robust, reliable modeling option for such flows. Three dimensional gas flow simulation results indicate that the gas flow exits the Separator through two pathways. One part of the gas spirals down from outer annular space to outer separation space and dust hopper, then spirals upward in the inner part of Separator, and finally exits the Separator. The other gas flow enters the vent pipe through the slots in vortex finder rather than entering the separation space. The simulation results show that the latter part flow accounts for 54% of the total gas flow. Diversion of gas pathways has three advantages. Firstly, the 54% of the gas–solid flows can be separated by slots due to the novel vortex finder. Secondly, the results also indicate that there are almost no short circuit flows under the inlet of the slotted vortex finder. Thirdly, the slotted vortex finder reduces the flow swirling intensity and undesired instabilities, and thus the slotted vortex finder can reduce pressure drop.
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Coupling Vibration Investigation of Cyclone Separator Interacted With Unsteady Fluid
Journal of Pressure Vessel Technology-transactions of The Asme, 2015Co-Authors: Qiang Li, Weiwei Xu, Jianjun WangAbstract:Gas–Cyclone body coupling vibration is one kind of vibration caused by air pulsation. This coupling vibration causes widespread damage and deformation of three-stage Cyclone Separator used in residue fluid catalytic cracking. After theoretically analyzing the mechanism of the generation of the gas–Cyclone body coupling vibration, the numerical simulation of three-dimensional swirling flow the Cyclone Separator was performed by using Reynolds stress model (RSM). The results showed the existence of precessing vortex core (PVC) in the Cyclone Separator. The PVC phenomenon and motion of PVC were described in detail. Furthermore, the amplitude and frequency of gas fluctuation in the PVC region at different axial positions were quantitatively analyzed. The simulation results agreed with the experimental results of laser Doppler velocimetry (LDV). Finally, characteristics of PVC in Cyclone Separator with a novel vortex finder were designed, and the results showed that the novel vortex finder can reduce flow vibration.
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performance evaluation of a new Cyclone Separator part i experimental results
Separation and Purification Technology, 2015Co-Authors: Qiang Li, Weiwei Xu, Jianjun WangAbstract:Abstract This paper presents the gas flow characteristics of a guide-vane-inlet Cyclone Separator with a novel vortex finder. The new design is based on the idea of increasing Cyclone efficiency and reducing pressure drop by improving vortex finder structure. Instead of traditional vent pipe, the vortex finder is slotted on side wall. A model of Cyclone with this novel vortex finder has been manufactured and tested. Total collection efficiency, grade collection efficiency and pressure drop were measured at various flow rates. Experimental results show that the novel vortex finder can increase particle collection efficiency and reduce pressure drop.
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Coupling Vibration Investigation of Cyclone Separator Interacted With Unsteady Fluid
Volume 4: Fluid-Structure Interaction, 2014Co-Authors: Qiang Li, Youhai Jin, Ying Guo, Weiwei Xu, Jianjun Wang, Ying WangAbstract:Gas-structure coupling vibration is one kind of vibration caused by air pulsation. This coupling vibration causes widespread damage and deformation of three-stage Cyclone Separator used in Residue Fluid Catalytic Cracking (RFCC). After theoretically analyzing the mechanism of the generation of the gas-structure coupling vibration, the numerical simulation of three-dimensional swirling flow the Cyclone Separator was performed by using Reynolds Stress Model (RSM). The results showed the existence of processing vortex core (PVC) in the Cyclone Separator. The PVC phenomenon and motion of PVC were described in detail. Furthermore, the amplitude and frequency of gas fluctuation in the PVC region at different axial positions were quantitatively analyzed. The simulation results agreed with the experimental results of Laser Doppler Velocimetry (LDV). Finally, considering the characteristics of transient torsional pendulum of PVC in Cyclone Separator, the fluid-solid coupling dynamic characteristics of three-stage Cyclone Separator were analyzed by the finite element method, which provides references for the structure optimization design of new type Cyclone Separator.
Weiwei Xu - One of the best experts on this subject based on the ideXlab platform.
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performance evaluation of a new Cyclone Separator part ii simulation results
Separation and Purification Technology, 2016Co-Authors: Weiwei Xu, Qiang Li, Jianjun WangAbstract:Abstract A novel vortex finder (slotted vortex finder) was designed to improve Cyclone Separator performance. The gas flow in axial-inlet Cyclone Separator with the novel vortex finder is simulated by means of Reynolds Stress Model (RSM). The computational results of the flow patterns in Cyclone Separator are compared with the experimental ones, and the results show that RSM offers a robust, reliable modeling option for such flows. Three dimensional gas flow simulation results indicate that the gas flow exits the Separator through two pathways. One part of the gas spirals down from outer annular space to outer separation space and dust hopper, then spirals upward in the inner part of Separator, and finally exits the Separator. The other gas flow enters the vent pipe through the slots in vortex finder rather than entering the separation space. The simulation results show that the latter part flow accounts for 54% of the total gas flow. Diversion of gas pathways has three advantages. Firstly, the 54% of the gas–solid flows can be separated by slots due to the novel vortex finder. Secondly, the results also indicate that there are almost no short circuit flows under the inlet of the slotted vortex finder. Thirdly, the slotted vortex finder reduces the flow swirling intensity and undesired instabilities, and thus the slotted vortex finder can reduce pressure drop.
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Coupling Vibration Investigation of Cyclone Separator Interacted With Unsteady Fluid
Journal of Pressure Vessel Technology-transactions of The Asme, 2015Co-Authors: Qiang Li, Weiwei Xu, Jianjun WangAbstract:Gas–Cyclone body coupling vibration is one kind of vibration caused by air pulsation. This coupling vibration causes widespread damage and deformation of three-stage Cyclone Separator used in residue fluid catalytic cracking. After theoretically analyzing the mechanism of the generation of the gas–Cyclone body coupling vibration, the numerical simulation of three-dimensional swirling flow the Cyclone Separator was performed by using Reynolds stress model (RSM). The results showed the existence of precessing vortex core (PVC) in the Cyclone Separator. The PVC phenomenon and motion of PVC were described in detail. Furthermore, the amplitude and frequency of gas fluctuation in the PVC region at different axial positions were quantitatively analyzed. The simulation results agreed with the experimental results of laser Doppler velocimetry (LDV). Finally, characteristics of PVC in Cyclone Separator with a novel vortex finder were designed, and the results showed that the novel vortex finder can reduce flow vibration.
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performance evaluation of a new Cyclone Separator part i experimental results
Separation and Purification Technology, 2015Co-Authors: Qiang Li, Weiwei Xu, Jianjun WangAbstract:Abstract This paper presents the gas flow characteristics of a guide-vane-inlet Cyclone Separator with a novel vortex finder. The new design is based on the idea of increasing Cyclone efficiency and reducing pressure drop by improving vortex finder structure. Instead of traditional vent pipe, the vortex finder is slotted on side wall. A model of Cyclone with this novel vortex finder has been manufactured and tested. Total collection efficiency, grade collection efficiency and pressure drop were measured at various flow rates. Experimental results show that the novel vortex finder can increase particle collection efficiency and reduce pressure drop.
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Coupling Vibration Investigation of Cyclone Separator Interacted With Unsteady Fluid
Volume 4: Fluid-Structure Interaction, 2014Co-Authors: Qiang Li, Youhai Jin, Ying Guo, Weiwei Xu, Jianjun Wang, Ying WangAbstract:Gas-structure coupling vibration is one kind of vibration caused by air pulsation. This coupling vibration causes widespread damage and deformation of three-stage Cyclone Separator used in Residue Fluid Catalytic Cracking (RFCC). After theoretically analyzing the mechanism of the generation of the gas-structure coupling vibration, the numerical simulation of three-dimensional swirling flow the Cyclone Separator was performed by using Reynolds Stress Model (RSM). The results showed the existence of processing vortex core (PVC) in the Cyclone Separator. The PVC phenomenon and motion of PVC were described in detail. Furthermore, the amplitude and frequency of gas fluctuation in the PVC region at different axial positions were quantitatively analyzed. The simulation results agreed with the experimental results of Laser Doppler Velocimetry (LDV). Finally, considering the characteristics of transient torsional pendulum of PVC in Cyclone Separator, the fluid-solid coupling dynamic characteristics of three-stage Cyclone Separator were analyzed by the finite element method, which provides references for the structure optimization design of new type Cyclone Separator.
Dzmitry Misiulia - One of the best experts on this subject based on the ideXlab platform.
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computational investigation of an industrial Cyclone Separator with helical roof inlet
Chemical Engineering & Technology, 2015Co-Authors: Dzmitry Misiulia, Anders G Andersson, Staffan T LundstromAbstract:An industrial Cyclone Separator with helical-roof inlet TsN-11 has been numerically investigated as to pressure and flow field, pressure drop, fractional efficiency, and particle trajectories inside the Cyclone. The turbulence was modeled with Reynolds stresses and large eddy simulations (LES) based on three different subgrid-scales (SGS). The results with the different setups were compared to experimental data from previous studies. For a proper calculation of the flow field, LES combined with a dynamic SGS model was used for predicting Cyclone performance. Individual particles were tracked through the unsteady flow field using the Lagrangian approach. The results of the numerical calculations of the tangential and axial velocity, pressure drop, and cut size are in good agreement with experimental measurements.
Staffan T Lundstrom - One of the best experts on this subject based on the ideXlab platform.
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computational investigation of an industrial Cyclone Separator with helical roof inlet
Chemical Engineering & Technology, 2015Co-Authors: Dzmitry Misiulia, Anders G Andersson, Staffan T LundstromAbstract:An industrial Cyclone Separator with helical-roof inlet TsN-11 has been numerically investigated as to pressure and flow field, pressure drop, fractional efficiency, and particle trajectories inside the Cyclone. The turbulence was modeled with Reynolds stresses and large eddy simulations (LES) based on three different subgrid-scales (SGS). The results with the different setups were compared to experimental data from previous studies. For a proper calculation of the flow field, LES combined with a dynamic SGS model was used for predicting Cyclone performance. Individual particles were tracked through the unsteady flow field using the Lagrangian approach. The results of the numerical calculations of the tangential and axial velocity, pressure drop, and cut size are in good agreement with experimental measurements.
