Research and Development of Highly Efficient Sequestration System of CO_2 at the Deep Ocean Using Large-Scale Structure of Turbulent Bubbly Flows

利用大尺度湍流气泡流结构的深海CO_2高效封存系统研究与开发

基本信息

批准号：
13355008
负责人：
SAITO Takayuki
金额：
$ 33.86万
依托单位：
Shizuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

On the basis of experimental and numerical approaches to elucidate large-scale structure and multi-scale structure of the turbulent bubbly flows in a large-diameter pipe, we have obtained the following results on the characteristics of large-scale GLAD System (Gas Lift Advanced Dissolution System for CO_2) as well as its environmental and cost performance:1)ExperimentsWe have elucidated the large-scale structure of the turbulent bubbly flows in a turbulence water vessel using PIV (Particle Image Velocimetry), LDA (Laser Doppler Anemometer) and 4-Tip Optical-fiber Probe newly developed by our research group as follows:a)The turbulent bubbly flows have the large-scale structure by superimpose the buoyancy flow induced by the bubble swarms onto the large-scale structure of the liquid-phase single phase flow.b)The coupling mechanism between the interface motion of a member bubble of the swarms and the motion of its surrounding liquid have been elucidated form a viewpoint of the local-scale … More structure.c)The coupling mechanism between mass transfer and the interface motion of a CO_2 bubble have been elucidated.2)ModelingWe have established a model of the bubble swarm motipn considered the large-scale structure of the turbulent bubbly flows:a)The region of a surrounding liquid flow induced, by the buoyancy of an individual single bubble is of about two times of the bubble diameter.b)The flow of the upper side of the bubble swarm is well approximated by the surrounding liquid flow induced by the buoyancy of an individual single bubble.c)Characteristic frequency components is caused mainly by the interface motion of the bubble and the center-of-gravity motion of the bubble.3)Numerical simulationWe have analyzed the large-scale structure of the turbulent bubbly flows using both DNS and LES methods. On the basis of the numerical analysis, we have grasped characteristics of the GLAD system using improved DEM.4)Prototype systemWe have developed prototype GLAD system of 149 mm in pipe diameter and 40 m in height. We have confirmed the system performance, environmental acceptability and the cost. Furthermore, we demonstrated its pumping performance using the 200-m scale test facility of the GLAD system. Less

在通过实验和数值方法阐明大直径管道内湍流气泡流的大尺度结构和多尺度结构的基础上，我们对大型GLAD系统（Gas Lift Advanced）的特性得到了以下结果： CO_2)溶解系统及其环境和性价比：1)实验我们利用湍流水容器阐明了湍流气泡流的大尺度结构本课题组新开发的PIV（粒子图像测速仪）、LDA（激光多普勒风速计）和四尖光纤探头如下： b)气泡群成员气泡的界面运动与运动的耦合机制从局域尺度结构的角度阐明了其周围液体的结构。c)阐明了 CO_2 气泡的传质与界面运动之间的耦合机制。2)建模我们建立了一个模型气泡群运动考虑了湍流气泡流的大尺度结构：a）由单个气泡的浮力引起的周围液体流动的区域大约是气泡的两倍b）气泡群上侧的流动很好地近似于单个气泡的浮力引起的周围液体流动。c）特征频率分量主要由气泡与中心的界面运动引起3)数值模拟利用DNS和LES方法对湍流气泡流的大尺度结构进行了分析，在数值分析的基础上，掌握了湍流气泡流的特征。 4）原型系统我们开发了管道直径为149 mm、高度为40 m 的原型GLAD 系统，我们已经确认了系统的性能、环境可接受性和成本，此外，我们还证明了其泵送性能。 GLAD系统200米规模的测试设施。