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中文摘要：
通过测量两个不同频率下的超声波衰减，结合长波区情况下简化ECAH模型，可以计算出被测气固两相流中颗粒相的粒径和浓度。文中以电站锅炉燃煤煤粉作为被测颗粒相，设计了双频超声波检测和颗粒重力输送实验装置，在100kHz和200kHz的频率下进行实验研究，并将测得实验结果与图像粒度处理仪测量结果进行比较。结果表明，该方法测得的平均粒径与图像粒度处理仪的结果较为吻合；测量浓度值与标称值相比，结果较接近。该方法可以实现气固两相流固相颗粒浓度的在线测量。
英文摘要：
It presents a particle size and concentration measurement method based on the principle of ultrasonic attenuation at two different frequencies. As a theoretical basis, the simplified ECAH model in long-wavelength range is employed to predict the attenuation. With the help of a gravity transport device, experiments of air-coal flow are carried out to measure the particle mean size and concentration, in which ultrasonic signal has been generated and receiver by transducers with fixed frequencies of 100 and 200 kHz. The ultrasonic measurement results are compared with image processing measurements and given concentrations, which show that the present method possesses a good foreground for the on-line measurement of particle concentration.
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