静电式气固两相流参数测试系统关键技术研究

发布时间：2018-01-10 15:04

本文关键词：静电式气固两相流参数测试系统关键技术研究　出处：《中北大学》2017年硕士论文　论文类型：学位论文

【摘要】：现如今气固两相流技术被广泛地应用于实际工业生产过程中,如发电厂、钢铁厂、化学以及食品厂等,而流体颗粒的在线参数测量是衡量气固两相流质量流量的重要指标。近年来许多学者基于传输中固体颗粒的静电感应特性提出了静电传感器测流体流速的方法。静电测量法相比于其他几种方法,如电容法,衰减法,光学法等,具有结构简单、成本小且灵敏度较高等特点,这使其在测量气固两相流参数中有很好的发展前景。本文在静电法的基础上用互相关原理设计了静电传感器系统并验证其用于流体速度在线测量的可行性和可靠性。本文针对两相流流动特性设计搭建了两相流管道模拟实验系统,并在管道系统中内插两组静电传感器测量系统。其中首先介绍了静电传感器的设计原理,其理论依据主要为固体颗粒在气力运输过程中由于摩擦碰撞而产生地静电感应电荷,并根据分析其电荷的特性设计了静电传感器的材料结构以及信号检测调理电路,并阐述了传感器互相关测速机理;其次利用ANSOFT公司的有限元分析软件MAXWELL针对设计好的传感器进行灵敏度仿真分析,得出带电粒子在不同情况下通过传感器敏感区域时电极上电荷的分布情况,证明电极设计的合理性;最终搭建实验平台,完成数据采集控制以及上位机软件平台的设计,并从简单情况和实际情况出发设计了两种验证实验,验证了系统设计的合理性与可行性。实验结果表明,该系统满足设计要求,解决了气固两相流流体速度检测的问题,并提出了静电传感器的互相关测量方法。该系统具有方法新颖、重复性好、测试精度高以及实用性强等优点,以后可以应用于工业过程中。
[Abstract]:Nowadays, gas-solid two-phase flow technology is widely used in practical industrial production processes, such as power plants, steel plants, chemical and food plants, and so on. The on-line parameter measurement of fluid particles is an important index to measure the mass flow rate of gas-solid two-phase flow. In recent years, many scholars have put forward the method of measuring fluid velocity by electrostatic sensor based on the electrostatic induction characteristics of solid particles in transmission. Electrostatic measurement is compared to several other methods. Such as capacitance method, attenuation method, optical method and so on, has the characteristics of simple structure, low cost and high sensitivity. This makes it promising in measuring the parameters of gas-solid two-phase flow. Based on electrostatic method, the electrostatic sensor system is designed based on the principle of cross-correlation, and the feasibility and reliability of its application in on-line measurement of fluid velocity are verified. In this paper, a two-phase flow simulation experiment system is built for the design of two-phase flow characteristics. Two groups of electrostatic sensor measurement systems are interpolated in the pipeline system. Firstly, the design principle of electrostatic sensor is introduced. The main theoretical basis is the electrostatic induced charge caused by friction and collision of solid particles in the pneumatic transport process. According to the characteristics of its charge, the material structure of electrostatic sensor and signal detection and conditioning circuit are designed, and the mechanism of sensor cross-correlation velocimetry is described. Secondly, the sensitivity of the sensor is simulated by using the finite element analysis software MAXWELL of ANSOFT Company. The distribution of charge on the electrode is obtained when charged particles pass through the sensitive region of the sensor under different conditions, which proves the rationality of the electrode design. Finally, build the experimental platform, complete the design of data acquisition control and host computer software platform, and design two kinds of verification experiments from the simple situation and the actual situation. The rationality and feasibility of the system design are verified. The experimental results show that the system meets the design requirements and solves the problem of gas-solid two-phase flow velocity detection. This system has the advantages of novel method, good repeatability, high testing precision and strong practicability. It can be used in industrial process in the future.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O359;TP274

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