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提出了一种管内煤粉体积分数的超声波测量方法,设定中心频率为31kHz的一体式超声波探针,基于声散射理论模型,利用数值模拟结果拟合出超声波衰减系数随煤粉体积分数的变化关系,并对某电厂煤粉输运管道进行了管内不同深度测点煤粉体积分数的在线测量实验,通过对超声波信号分析得到对应的衰减系数值,分析超声波信号与煤粉体积分数之间的关系,得到煤粉体积分数.结果表明:衰减系数与煤粉体积分数存在线性关系;实验段煤粉管道内煤粉体积分数基本在0.09%~0.14%浮动;所提方法可为管内煤粉体积分数的实时在线测量提供一种行之有效的手段.
A method for ultrasonic measurement of the volume fraction of pulverized coal in a pipe was proposed. An integrated ultrasonic probe with a center frequency of 31 kHz was set up. Based on the acoustic scattering theory model, the ultrasonic attenuation coefficient was fitted with the change of the volume fraction of pulverized coal by numerical simulation Relationship between the pulverized coal transport pipelines and the measurement of pulverized coal volume fraction at different depths in the pipelines. The corresponding attenuation coefficient values were obtained by analyzing the ultrasonic signals and the relationship between the ultrasonic signal and the volume fraction of pulverized coal The results show that there is a linear relationship between the attenuation coefficient and the volume fraction of pulverized coal, and the volume fraction of pulverized coal in the experimental pulverized coal pipeline fluctuates from 0.09% to 0.14% basically. The proposed method can be the volume of pulverized coal Real-time online score measurement provides an effective means.