基于激光后向散射法的湍动流化床颗粒流动参数测量  

Measuring Particles Flow Parameter in a Turbulent Fluidized Bed Based on Laser Backscattering

作　　者：奚国强 李舒 彭词 唐志永[3] 许传龙[1] XI Guo-qiang;LI Shu;PENG Ci;TANG Zhi-yong;XU Chuan-long(MOE Key Laboratory of Energy Thermal Conversion and Control,Southeast University;Technical Developing Department,Nanjing Institute of Measurement and Testing Technology;Key Laboratory of Low-carbon Conversion Science and Engineering,CAS Shanghai Advanced Research Institute)

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室 [2]南京市计量监督检测院科技发展部 [3]中国科学院上海高等研究院低碳转化科学与工程中心

出　　处：《化工自动化及仪表》2018年第11期859-864,共6页Control and Instruments in Chemical Industry

基　　金：国家科技支撑项目(2015BAA03B02);中国科学院低碳转化科学与工程重点实验室开放基金项目(KLLCCSE-201703)

摘　　要：提出一种基于激光后向散射法的集成测量系统,用于湍动流化床上升管内颗粒速度和浓度的空间分布测量。在湍动流化床上升管上,使用双激光光纤探头获得各测点速度、浓度的光信号,经过信号转换和数据采集后最终在计算机上显示。实验结果表明:该系统能够准确测量湍动流化床颗粒流动参数;上升管内,颗粒分布呈中心稀而壁面浓的现象;随着流化风量的增加,床内颗粒速度增加,但浓度降低;上升管中心区域,颗粒速度随轴向高度的增加呈先增加后减小的趋势。An integrated measurement system based on laser backscattering method was proposed to measure space distribution of particles＇ velocity and concentration in rising tube of turbulent fluidized bed. In the rising tube, having double laser fibre-optics probes employed to collect optical signals at each measuring point and then having them converted and sampled through a photoelectric converter and a data acquisition card and finally having them displayed on a computer. Experimental results show that, the proposed system can accurately measure particle flow parameters in the turbulent fluidized bed; in the riser, the particles distribute thinly in the center area and thickly over the wall surface; with the increase of flow rate of the fluidized air, the particles＇ velocity rises and the particle concentration decreases ; in the center of the rising tube, the particles＇ velocity increases at first and then decreases with the increase of axial height.

关 键 词：集成测量系统 激光后向散射法 湍动流化床 颗粒流动参数 激光光纤探头 

分 类 号：TH862[机械工程—仪器科学与技术]