新型复合除尘器的设计及数值模拟

Design and numerical simulation of a new precipitator

设计一种新型旋风-布袋复合除尘器,采用两级复合除尘技术,弥补旋风除尘对于细颗粒去除效率低的不足.通过FLUENT软件提供的RNG K-ε湍流模型对其内部流场进行了数值模拟,并和未加布袋的普通旋风除尘器内部流场进行对比,探明复合除尘器内压力场和速度场基本特征.数值模拟结果表明,新型除尘器内局部湍流数目减少但切向入口处存在较强局部湍流现象;压力场变化较大,压差主要集中在布袋内外两侧.通过对复合除尘器内流场分析,为以后结构进一步优化设计提供依据.此外,复合除尘器采用嵌入式结构,占用空间小,造价低,具有广泛的应用前景.

We designed a new cyclone-bag composite precipitator adopting the two-stage filtration to ameliorate the low efficiency of the cyclone precipitor to fine particles. The RNG K-ε turbulence model was selected to simulate the composite precipitator and the ordinary obtained by reasonable analyzing and debugging. We cyclone separator. Excellent convergent results were studied the velocity field, the pressure field and the turbulent flow field. We found that there existed a strong turbulence at the entrance of the cyclone-bag precipitator. The pressure field of the cyclone-bag precipitator had a significant change,especially on both sides of the bag. The research result will provide further reference for an optimization design of cyclone-bag precipitator and offer scientific theory basis for the design of intelligent air inlet control methods. The novel precipitator has the advantages of space-saving and low cost because of its embedded structure.