超临界水-颗粒流态化的流型分布特性及转变规律

项目名称： 超临界水-颗粒流态化的流型分布特性及转变规律

项目编号： No.51306145

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 能源与动力工程

项目作者： 金辉

作者单位： 西安交通大学

项目金额： 25万元

中文摘要： 流态化可以强化流体与颗粒间的接触和传递，已广泛应用于能源、化工等工业领域。常规流态化系统主要涉及气、液、固系统，而最新的进展是流化介质已拓展到超临界流体，超临界水流化床反应器在生物质/煤的超临界水气化领域中展示出良好的应用前景。超临界水-颗粒流态化的流型分布特性及转变规律是反应器设计与运行的基础，而高的运行参数及水在拟临界温度附近剧烈变化的物性导致相关研究面临困难。本项目拟构建超临界水-颗粒流态化测试系统，通过对压力信号的采集与非线性分析，获得流型种类、特征、流型转变规律，阐明其与系统参数之间的内在关联；同时通过理论分析，建立超临界水中颗粒绕流物理模型，采用数值方法求解颗粒所受曳力与超临界水剧烈变化物性间的耦合定量关系。以此为基础对超临界水流化床的流场分布及颗粒运动特性进行数值模拟，探索超临界水物性对系统参数与流型分布关联的影响，与实验结果相互验证。研究成果有望丰富超临界水流态化理论。

中文关键词： 超临界水；流态化；流型；两相流；

英文摘要： Fluidization can enhance the contact and transfer between fluid and particles and is widely used in engineering industry such as energy and chemical engineering technology. Fluidization system generally involves gas, liquid and solid. Supercritical fluid has become a new fluidization agent and supercritical water fluidized bed reactor shows good prospects for the application of biomass/coal supercritical water gasification. The flow regime distribution and transition regularity of the supercritical water-particle fluidization are of great importance for the reactor design and control. However, extreme operating conditions and the intensive variation of water properties near the quasi-critical point temperature make related research difficult. In this project, experimental system for supercritical water fluidized bed will be developed to obtain the type, characteristics, transition regularity and the relationship between flow regime transition and system parameters. On the other hand, a model of flow past particle in supercritical water will be developed, which can show the inner relationship between the drag force of particles and the variation of supercritical water properties. Then a numerical simulation of the distribution characteristics of the flow field and particles in supercritical water fluidized bed wi

英文关键词： Supercritical water；Fluidization；Flow regime；Two-phase flow；