基于超声波有效媒质模型水煤浆粒度控制
首发时间:2013-04-16
摘要:发展先进的洁净煤技术,改造落后的燃煤技术是降低煤炭污染的关键。水煤浆是以煤代油的首选燃料。水煤浆颗粒粒度的分布对水煤浆质量的控制起着举足轻重的作用,在线实时监测水煤浆粒度分布是控制水煤浆质量的关键。以结构平均为基础的有效媒质理论模型能够能够实现水煤浆粒度的在线检测。实验模拟证明有效媒质模型超声法完全能够实现水煤浆粒度的在线检测,对于检测细粒级和粗粒级颗粒系的粒度分布比较理想测量精度高,声衰减和被测浆体中颗粒粒经呈现非线性关系,在110微米附近出现一个衰减的极小值点,可以采用三频率法对其进行反演计算。
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Particle size distribution control of coal-water slurry with effective medium model
Abstract:The key to reduce coal pollution are the development of clean coal technology and the improvement of the backward coal-burning technology. The coal water slurry (CWS) is the first substitute of the oil. The particle size distribution of CWS plays an important role in the quality control of CWS. This article proposes an ultrasonic method with effective medium theory model which can be accurately reflected in the acoustic attenuation characteristics of coal-water slurry based on structural average. Experimental simulation proved that effective medium model is fully capable of achieving on-line detection of coal-water slurry particle size, for detection of fine-and coarse-sized particle size distribution.non-linear relationship between attenuation and particle size, the three-frequency method can be used to inverse calculation of its. which we can achieve CWS granularity on-line, and continuously control the quality of CWS.
Keywords: coal water slurry ultrasonic wave size distribution effective medium model
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