变径提升管压力脉动和颗粒循环量数值模拟

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英文篇名：CPFD Simulation of Pressure Fluctuation and Solid Circulation Rate of Multi-regime Rriser 作者：邹媛媛 ; 冯璇 ; 沈来宏 英文作者：Zou Yuanyuan; 关键词：变径提升管 ; 数值模拟 ; 多相流 ; 压力脉动 ; 颗粒循环量 英文关键词：multi-regime riser;;numerical simulation;;multiphase flow;;pressure fluctuation;;solid circulation rate 中文刊名：GYKJ 英文刊名：Industrial Control Computer 机构：东南大学能源热转换及其过程测控教育部重点实验室; 出版日期：2019-06-25 出版单位：工业控制计算机 年：2019 期：v.32 基金：国家重点研发计划(2018YFB060540004) 语种：中文; 页：GYKJ201906009 页数：3 CN：06 ISSN：32-1764/TP 分类号：24-26

摘要

提升管对双流化床系统运行具有重要影响,采用CPFD方法研究下部管径大,上部管径小的变径提升管中的气固流动特性、压力脉动和颗粒循环量。模拟结果表明变径提升管颗粒浓度为下浓上稀的轴向分布结构,稀相区颗粒浓度径向分布为两边高、中心低的环核结构。功率谱分析显示提升管内存在0.1～0.3Hz的全局压力波动,该压力波动主要来源于底部气泡的产生和破碎,同时颗粒循环量的波动主要受到底部流化状态的影响。颗粒循环量随着入口气速的增大而增大,循环量的波动则随着入口气速的增大而减小,但入口气速超过0.99m·s~(-1)之后,颗粒循环量的波动减小速度受到颗粒团聚的影响而减慢。
        A model based on CPFD method is developed to study the gas-solid flow characteristics,the pressure fluctuation and the solid circulation rate of the multi-regime riser.The simulation predicted the heterogeneous solid distribution radially and axially.The power spectrum analysis of pressure signal revealed that the pressure fluctuation mainly resulted from the behavior of bubbles in bottom region,and the fluctuation of solid circulation rate is controlled by the flow behavior in the bottom region.Higher inlet velocity could lead to an improvement of solid circulation rate while the fluctuation of solid circulation rate became smaller,the particle cluster phenomena could reduce the stability of the solid circulation rate.

引文

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