湿式除尘风机三相除尘运行参数研究

来源期刊:中南大学学报(自然科学版)2017年第6期

论文作者:赵海鸣 谢信 夏毅敏 廖小乐

文章页码:1505 - 1513

关键词:湿式除尘风机;气液固;三相流;除尘效率;数值模拟

Key words:wet dust collecting fan; gas-liquid-solid; three-phase; separation efficiency; numerical simulation

摘    要:针对湿式除尘风机内部气液固三相流场的特点,在FLUENT中采用欧拉法描述气相湍流流动,采用拉格朗日法描述粉尘与液滴的运动,同时考虑气、液、固三相之间的耦合关系,运用Euler/DPM/DPM模型对其内部流场进行数值模拟。将数值计算结果与实验结果进行比较,验证该数值模型用于模拟风机三相流场的可行性与准确性,为进一步优化湿式除尘风机提供依据,并在此基础上研究湿式风机的除尘效率与粉尘粒度、风机转速及液气比等参数的相互关系。研究结果表明:粉尘粒度越大、风机转速越高、液气比越大,除尘效率越高;当粉尘粒度由15 μm减少到1 μm时,除尘效率从99%降至65%;当风机转速由1 500 r/min增加到1 700 r/min时,粒度为3~10 μm的颗粒除尘效率可提高3%~5%;提高增大液气比(0.1~0.4 L/m3)可明显提高小粒度粉尘颗粒(1~10 μm)的除去效率。

Abstract: Based on the feature of gas-liquid-solid three-phase flow in wet dust collecting fan, the method of Eulerian was used to simulate gas turbulent flow and the method of Lagrange was used to describe the motion of dust and droplet in FLUENT software. Considering the coupling relationship of gas-liquid-solid three-phase, the Euler/DPM/DPM three-phase model was used to simulate the three-phase flow of fan. Through comparing the numerical calculating results with experiment results, the veracity and feasibility of the model were verified to simulate the three-phase flow in wet dust collecting fan, which furtherly provides the basis for optimizing wet dust collecting fan. On this basis,the relationship between the separation efficiency and operation parameters such as the particle sizes, rotating speed and gas-liquid ratio were obtained by the numerical simulation. The results show that the greater the particles sizes and the higher the rotating speed and gas-liquid ratio, the higher the separation efficiency. The separation efficiency decreases from 99% to 65% when particle size decreases from 15 μm to 1 μm. The separation efficiency among the particle size range of 3-10 μm will increase by 3%-5% when the rotating speed increase from 1 500 r/min to 1 700 r/min. Increasing gas-liquid ratio (0.1-0.4 L/m3) can evidently promote the separation efficiency of small diagram dust particle (1-10 μm).

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