除雾器整体结构优化

Overall Structure Optimization of Mist Eliminator

为提高折流板除雾器的除雾效率,对除雾器叶片间距、转折角度、转折高度、流速、不同液滴直径等因素对除雾效率的影响予以研究,并通过引入评价参数KpPi Re2寻求合理的结构使引风机在较小功耗时除雾器能够具有较高除雾效率。结果表明除雾器效率与液滴直径、流速成正比,与转折角度、叶片间距反比,除雾器转折高度对除雾器效率的影响作用较小。最终确定的除雾器优化结构参数为θ=40°、H3=25mm、D=20mm,当流速在2~3m/s时优化结构的除雾器效率提升平均约为16%,在4m/s时优化结构的除雾效率提升平均约为11%,在5~6m/s时,优化结构的除雾器效率提升平均约为9%。当除雾器达到同一除雾效率时,优化结构对应的评价参数KpPiRe^2要明显小于初始结构,此时所需的引风机功耗更小。通过评价参数KpPiRe^2可在除雾效率和风机功耗之间寻找一个较好的平衡点,为除雾器优化设计提供了一定的参考。

In order to improve the demisting efficiency of the baffle demister, the influence of the demister blade pitch, turning angle, turning height, flow velocity, different droplet diameter and other factors on the demisting efficiency were studied, and the evaluation parameter KpPi Re2 was introduced. Reasonable structure enables the defogger to have higher defogging efficiency when the induced draft fan is used at lower power consumption. The results show that the efficiency of the defogger is proportional to the droplet diameter and flow velocity, and inversely proportional to the turning angle and the blade pitch. The effect of the defogger turning height on the efficiency of the defogger is small. The optimized structure parameters of the final defogger are determined as θ=40°, H3=25 mm, D=20 mm. When the flow rate is 2~3 m/s, the efficiency of the defogger of the optimized structure is about 16%, which is optimized at 4 m/s. The defogging efficiency of the structure is increased by an average of about 11%. At 5 to 6 m/s, the efficiency of the optimized structure of the demisters is about 9%. When the defogger reaches the same demisting efficiency, the evaluation parameter KpPi Re2 corresponding to the optimized structure is significantly smaller than the initial structure, and the required induced draft fan power consumption is smaller. By evaluating the parameter KpPi Re2, a better balance point between the defogging efficiency and the fan power consumption can be found, which provides a certain reference for the optimal design of the defogger.