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中文摘要：
应用于燃煤电站气力输送系统的圆环式静电流量计可为监控煤粉的流动提供极有价值的参考信息。本文利用有限元方法研究了流量计的静电感应机理,并建立了传感器检测信号与运动荷电粉体关系的数学模型。理论分析表明,静电流量计信号的输出不仅取决于探头的几何形状、检测电路参数、颗粒荷电量的大小和空间分布,还与颗粒的速度、自身携带电荷随时间的变化率等因素有关。利用传送带实验装置对上述理论分析进行了初步的验证,并在Teesside大学气力输送系统上对内径为40mm的静电流量计,在不同的气固比条件下,获取了粉体质量流量和检测信号的标定结果。
英文摘要：
Ring-shaped electrostatic flow meters can provide significantly useful information on pneumatically transported powder. These meters have been used for measuring and controlling the pulverized coal flow distribution on the conveyors leading to the burners in coal-fired power stations and also used for investigation of electrification mechanism of gas-solids two-phase flow. In this paper, finite element method （FEM） is employed to investigate the characteristics of the sensor. A mathematic model has been developed to express the relationship between the voltage output of the meter and the stochastic motion of the charged particles in the sensing volume. The theoretical analysis, supported by the test results using a belt rig, demonstrates that the output of the meter depends upon the characteristics of the conditioning circuitry, the velocities and charge amount of the particles, the first order derivative of the charge, the location of the charged particles and etc. This paper also provides a set of calibration data for a 40 mm diameter electrostatic meter using the pneumatic conveying rig at the laboratory of University Teesside, from which the relationship between the output voltage of the meter and the solids mass flow rate under different air to solid ratios can be found and optimized to minimize the calibration error.
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HHT analysis of electrostatic fluctuation signals in dense-phase pneumatic conveying of pulverized c
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