基于DDS叠加波的双频超声法测量管内煤粉参数

发布时间：2018-03-09 12:33

本文选题：双频　切入点：超声法　出处：《中国粉体技术》2017年02期 　论文类型：期刊论文

【摘要】：基于声散射理论,考虑煤粉不规则度对声衰减的影响,通过数值模拟分析不同物性参数的影响,得出声衰减系数随煤粉体积分数和粒度的变化关系。设计中心频率分别为40、200 kHz的一体式超声波探针,使用叠加猝发波作为信号激励源以简化实验装置。在某电厂煤粉管道开展不同深度测点的实时在线测量,进行时长1 h的连续测量实验,同步测得煤粉平均体积分数约0.11%和平均粒径约35μm。该方法能够实时在线测量管内煤粉的体积分数和粒度,有效改善磨煤机工况和提高锅炉燃烧器效率。
[Abstract]:Based on the theory of acoustic scattering, considering the influence of the irregularity of pulverized coal on acoustic attenuation, the influence of different physical parameters is analyzed by numerical simulation. The relationship of acoustic attenuation coefficient with the volume fraction and particle size of pulverized coal is obtained. An integrated ultrasonic probe with center frequency of 40,200 kHz is designed. The superimposed burst wave is used as the source of signal excitation to simplify the experimental device. The real-time on-line measurement of different depth measurement points is carried out in a power plant's pulverized coal pipeline, and the continuous measurement experiment is carried out for one hour. The average volume fraction of pulverized coal is about 0.11% and the average particle size is about 35 渭 m. This method can be used to measure the volume fraction and particle size of pulverized coal in the tube in real time and improve the working condition of pulverizer and the efficiency of boiler burner.
【作者单位】：上海理工大学颗粒与两相流测量研究所上海市动力工程多相流动与传热重点实验室;上海明华电力技术工程有限公司;
【基金】：国家自然科学基金项目,编号:51206113
【分类号】：TM621;TB559

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