基于气固两相流场的袋式除尘器钢结构优化

Structure Optimization of Bag Filter Based on Inner Gas-solid Flow Field

除尘器内流场分布对除尘器的运行阻力、滤袋寿命以及除尘效率有较大的影响。采用计算流体动力学方法数值模拟袋式除尘器内部气固两相流场,用多孔跳跃介质边界模拟滤袋。为了改善箱体内部气流速度分布,提出在进气通道内加装不同角度导流板的改进方案,并对模拟结果进行分析比较。得出加装45°导流板后气流分布均匀性改善最好,气室综合流量不均幅值降低。研究结果为除尘器的结构优化设计提供理论依据。

The flow distribution has a great impact on the running resistance of filter, service life of bag and dust collection efficiency. The numerical simulation of filter internal gas-solid two-phase flow field was carried out by using computational fluid dynamics method, the porous-jump boundary condition was used to simulate the filter bags. In order to optimize the flow field, guide plates with different angle were installeded in the inflow passage. It was found that the 45-degree guide plate improved the flow distribution optimally, the amplitude of integrated uneven coefficient in each chamber was decreased simultaneously. The conclusions provide the theoretical basis for the optimal structure design of bag filter.