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Numerical Simulation of Axisymmetric Inlets Square Separator

Author: LiHao
Tutor: DiaoYongFa
School: Donghua University
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Square separator Gas-solid flow Reflective cone Wear and tear Numerical Simulation
CLC: TU831.4
Type: Master's thesis
Year: 2008
Downloads: 54
Quote: 0
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Abstract


Square separator birth of more than ten years of history, during the performance of a large number of studies. In this paper, the numerical simulation method with cone axis symmetry imported square diffusion separation phase flow field within a more comprehensive study, including the basic flow field characteristics, separation efficiency, and compare a single inlet and double inlet the similarities and differences of the performance of the separator flow field under the conditions discussed the reflection cones separator geometric parameters on the separation efficiency of the separator and resistance, square diffused separator numerical simulation of wear. Post-processing the article uses AutoCAD software to create geometric model, software Gambit meshing using Fluent software simulation, the calculated results using Tecplot and Oringin software display. Square diffused separator flow field, the gas phase of the simulation with a Reynolds stress turbulence model (RSM), particles calculated using the discrete phase model based on Lagrangian point of view of the DPM. The numerical results show that: the flow field within the square diffusion separators within liter drop outside the double-flow structure, strong shearing between the inner and outer layers. The axial, radial and tangential velocity on the whole have good symmetry. The square corner tangential velocity greater impact. The flow velocity is very low, the presence of a reflective cone so that its bottom, the static pressure is very high. Two imported separator five typical particle trajectories is given in the article discussed the influence of the flow rate on the resistance, compare the performance of both. 10m / s under the conditions of inlet gas velocity, the single inlet separator preferably above 15μm particle separation effect, double inlet separator is preferably more than 8μm particle separation effect. Under the same inlet flow conditions, the single inlet to the separation efficiency of the separator was slightly better, but the greater resistance. Diameter, bottom diameter and height of the size of the text by changing the top of the reflector cone of opening study the of reflective cone geometry parameters on the performance of the separator, respectively, to study the separation efficiency and resistance to impact, and discuss the different geometric parameters circumstances separation the speed of the internal distribution. The results show that the the the reflective cone geometry parameters separator resistance is not a greater influence on the separation efficiency. Wear problems are common problems in the gas-solid separator. Finally, by simulating particle separator wall collision discusses a the square diffusion type separator wear the preliminary separator wear relatively serious position, such as the the reflective cone outside wall, ash hopper and the upper part of the ash bucket the square section several parts, and some of the proposed measures and methods to reduce wear.

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CLC: > Industrial Technology > Building Science > Housing construction equipment > Air-conditioning, heating, ventilation,and its equipment > Air-conditioning > Air-conditioning machinery and equipment
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