Thermal-Flow Modeling of Fluidized-Bed combustor/Reactor (Real-Time Radiographic Quantitative Flow Visualizaiton of High Temperature Fluidized-Bed Model)

流化床燃烧器/反应器的热流建模（高温流化床模型的实时射线照相定量流可视化）

基本信息

批准号：
11450091
负责人：
OZAWA Mamoru
金额：
$ 10.37万
依托单位：
Kansai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

Aiming to construct fundamental basis of the thermal hydraulics in gas-fluidized bed operated at high temperature, experimental investigations have been conducted using the neutron and X-ray radiography systems. The experimental temperature range was from room temperature to about 450 degree C. For the room temperature experiment, the neutron radiography was used for quantitative measurement of void fraction and its fluctuation characteristics, interrelationship between the flow of bed materials and the heat transfer, bubble behavior in the bed including bubble rise velocity and bubble size, behavior of binary mixture in the bed, flow field around solid particles and bubbles. On the basis of the experimental data, the bubble rise velocity and the void fraction have been well correlated by the use of drift-fiux model. The observed bubble size was also well correlated taking into account the effect of tube bank arrangement.Segregation behavior is also an important factor for the design of fluidized bed. Then the fluidized-bed with binary mixture was visualized using neutron radiography. The dynamic behavior was well visualized and the qualitative and quantitative information useful in understanding the segregation were obtained.High temperature experiment was conducted using X-ray radiography system. Theh the minimum fluidization velocity, bubble movement, void fraction distribution and the fluctuation characteristics were obtained. At high temperature, bubbles were observed in the whole area of the bed, while only a limited part was agitated by the bubbles at room temperature. The other characteristics parameters were well correlated by means of drift-flux model as well.

旨在在高温下运行的气体燃料床中构建热液压的基本基础，使用中子和X射线射线照相系统进行了实验研究。实验温度范围从室温到约450度。对于室温实验，中子X射线照相用于定量测量空隙分数及其波动特性，床材料流动与热传递之间的相互关系，床中的气泡行为，床中的气泡行为，包括气泡速度和气泡尺寸和气泡大小，固体混合物的固体混合物，流量，流量，流量，泡沫围绕床，并构成泡沫。在实验数据的基础上，使用漂移模型的气泡上升速度和空隙分数已经很好地相关。考虑到管库排列的效果，观察到的气泡尺寸也很相关。隔离行为也是设计流化床设计的重要因素。然后使用中子射线照相将带有二元混合物的流体床可视化。充分可视化了动态行为，并获得了用于理解隔离的定性和定量信息。使用X射线射线照相系统进行了高温实验。获得最小流体速度，气泡运动，空隙分数分布和波动特性。在高温下，在整个床的整个区域都观察到气泡，而在室温下，气泡只会受到有限的部分。其他特征参数也通过漂移频率模型很好地相关。