输煤皮带转载点密闭罩流场模拟与结构优化

Flow field simulation and structure optimization of confined hood at transshipment point of coal conveyor belt

为了研究输煤皮带转载点密闭罩内流场对吸尘效果的影响,采用Fluent软件对某转载点密闭罩内气固两相流动情况进行了数值模拟。通过气流分布和煤尘浓度分布的分析,发现溜槽转折处较大的气流偏转会增加煤尘起尘量和导致局部煤尘积聚,吸尘罩的开口角度对吸尘效果也有较大影响。为了疏导气流并加强吸尘效果,提出了溜槽转折处和吸尘罩的结构优化设计方案。研究表明,改进后气流分布更加均匀,吸尘效果有所提高,从而为转载点密闭罩的优化设计提供了参考。

To study the effect of flow field on the dust absorption performance in a confined hood, numerical simulation of the gas-solid two-phase flow in a confined hood used in transshipment point of coal conveyor belt was carried out with Fluent. The analysis of gas flow field and distribution of coal dust concentration indicates that, with a larger flow deflection at chute turning point, the coal dust concentration will increase and the local coal dust accumulates more correspondingly. In addition, the analysis reveals that placket angle of the dust exhaust hood also had important influence on the dust absorption performance. In order to divert the gas flow as well as enhancing the effect of dust absorption, some optimization designs about the structure of chute turning point and the dust exhaust hood were devised. The result shows that, gas flow field and distribution of coal dust become more uniform and the dust absorption performance is improved after the optimization. Therefore, the present study provides some guidance for the optimization design of confined hood at the transshipment point of coal conveyor belt.