Longitudinal Acoustical Resonance Measurement of Particle Loading and Sizing in Gas-Solids Flow

本工程中的声共振测量技术 提供非侵入式和实时的质量负载测量 和通过气相流化的颗粒的尺寸。 的速度 气体中颗粒的两相混合物中的声音随着 颗粒的质量密度增加。 通过测量 线性相关的谐振频率的降低 对于音速，颗粒的质量密度为 测定 因为声速是色散的， 声速的频率依赖性提供了一种方法， 通过测量频率确定颗粒尺寸 不同的共振模式。 对于实际应用，需要纵向共振 用于声学共振测量。 一阶 声学分析这种非侵入性技术应用于 纵向共振被用于发现的条件， 电力企业煤粉气力输送 电站 分析调查包括评价 在工厂的整个运行范围内。 实验 闭环测试实验室规模测试台上的测量 并在发电厂进行，以验证该技术。 的 分析被用来解释实验的结果 测量.

The acoustical resonance measurement techniques in this project provide a nonintrusive and realtime measurement of mass loading and sizing of particles fluidized by a gas phase. The speed of sound in a two-phase mixture of particles in gas decreases as the mass density of the particles increases. By measuring the decrease in the resonant frequencies, which are linearly related to the speed of sound, the mass density of the particles is determined. Because the speed of sound is dispersive with the frequency dependence of the sound speed provides a method of determining the particle sizing by measurement of the frequencies of different resonant modes. For realistic applications, a longitudinal resonance is required for the acoustical resonance measurement. A first order acoustical analysis of this nonintrusive technique applied to longitudinal resonances is used for the conditions found in the pneumatic conveyance of pulverized coal in electrical utility power plants. The analytical investigation includes evaluation over the full operating ranges of the plant. Experimental measurements on a closed loop tests laboratory scale test stand and at a power plant are conducted to verify the technique. The analyses are used to interpret the results of the experimental measurements.