| 基于超声的管道内粉体体积分数的测量 |
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| 作者姓名： | 李永明 苏明旭 袁安利 蔡小舒 |
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| 作者单位： | 上海理工大学能源与动力工程学院颗粒与两相流测量研究所, 上海 200093 |
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| 基金项目： | 国家自然科学基金(51176128)和上海市研究生创新基金(JWCXSL1302)资助 |
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| 摘 要： | 管道内粉体的气力输运广泛存在于化工、食品加工、电力、冶金和医药等工业生产过程中.通过对粉体颗粒的速度、体积分数和粒度等关键参数进行在线测量, 可实现过程优化控制, 提高生产效率和产品质量,降低能耗.本文从声散射理论模型出发,数值模拟并拟合出超声衰减系数和声速随粉体体积分数的变化关系.设计中心频率为30 kHz的一体式超声波探针,在杭州某水泥厂输运管道进行管内不同深度测点水泥生料粉体浓度的在线测量,分别以衰减和声速方法获得管内粉体沿径向的体积分数分布.
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| 关 键 词： | 超声波 粉体 体积分数 在线测量 |
| 收稿时间： | 2015-03-13 |
| 修稿时间： | 2015-07-07 |
Measurement of powder volume fraction in pipe flow using ultrasound |
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| Authors: | LI Yongming SU Mingxu YUAN Anli CAI Xiaosu |
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| Institution: | Institute of Particle & Two-Phase Flow Measurement, University of Shanghai for Science and Technology, Shanghai 200093, China |
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| Abstract: | The transportation of gas-solid particle powder in pipeline widely exists in the manufacturing processes of chemical engineering, food processing, electric power, metallurgy, pharmacy, and other industries. With the help of on-line measurement of key parameters of powder speed, concentration, particle size, etc., the optimized control process can be implemented to improve production efficiency and product quality and reduce energy consumption. Based on the scattering model in ultrasonic propagation theory, numerical simulation has been carried out and a fitting of data shows that the ultrasonic attenuation and velocity present linear functions of the volume fraction at each frequency. An integrated ultrasonic probe with frequency of 30 kHz was designed, and then an experiment was conducted to measure the concentration of pneumatically conveyed cement raw meal powder in a bend pipeline at a cement plant in Hangzhou. The powder concentration distribution in the pipe along the direction of pipe diameter was obtained by using the methods of ultrasonic attenuation and ultrasound velocity, respectively. |
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| Keywords: | ultrasound powder volume fraction measurement |
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