扁平型移动床反应器近平推流排料的数值模拟与结构优化  

Numerical simulation and structural optimization of approaching to plug-flow discharge in flat moving-bed reactor

作　　者：宋晓锋 马世龙 孙正龙 安萍 贾鑫 韩振南 许光文[1,2] SONG Xiaofeng;MA Shilong;SUN Zhenglong;AN Ping;JIA Xin;HAN Zhennan;XU Guangwen(Key Laboratory of Resources Chemicals and Materials of Ministry of Education,Shenyang University of Chemical Technology,Shenyang 110142,Liaoning Province,China;State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]沈阳化工大学特色资源化工与材料教育部重点实验室,辽宁沈阳110142 [2]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190

出　　处：《化学工程》2025年第2期64-70,共7页Chemical Engineering(China)

基　　金：国家自然科学基金委辽宁联合基金重点项目(U1908201);国家自然科学基金委青年科学基金项目(22208225)。

摘　　要：为兼顾工业放大和外热式传热限制,近年来开发了扁平型移动床热解反应器,然而若排料结构设计不合理极易造成颗粒偏流,亟需对扁平型移动床反应器的排料结构进行优化,确保“平推流”排料。为此,利用Fluent软件建立大型扁平型移动床反应器颗粒流动模型,以排料口数量、尺寸为变量,进行排料系统的优化。结果表明:降低排料口高度、增加排料口开口尺寸和增加排料口数量可以减小反应器内部颗粒的速度波动,利于形成平推流排料,但排料口数量优化是保障平推流的核心控制因素。经过模拟优化,最接近平推流排料结构为:排料口数量5个、排料口高度1000 mm、排料口开口尺寸400 mm。此外,在数值模拟和优化的基础上,建立大型冷态移动床实验装置,运行结果表明反应器内颗粒为近平推流,验证了数值模拟的准确性。研究结果为移动床反应器的设计和运行提供理论指导。A moving-bed pyrolysis reactor featured with flat structure has been developed in recent years to simultaneously considering industrial scale-up and external heat transfer limitation.However,the unreasonable discharge structure of this reactor is easy to cause“bias flow”in particle moving flow and“funnel flow”for continuous particle discharge.Thus,it is urgent to optimize the discharge structure of the flat moving-bed reactor to ensure particle discharge approaching to plug flow.Therefore,the particle flow model of a large flat moving bed reactor was established by using Fluent software,and the discharge system was optimized with the number and size of discharge ports as variables.The results show that decreasing the height of discharge port,increasing the size and number of the discharge port can reduce velocity fluctuation of particles inside the reactor and be favorable to form plug flow.Through simulation optimization,the closest to the horizontal push flow discharge structure is that the number of discharge ports is 5,the height of the discharge port is 1000 mm and the opening size of the discharge port is 400 mm.While the determination of the number of discharge ports is the core control factor to ensure plug flow.Based on the simulation and optimization,a large-scale cold flow moving-bed device was built.The running results show that the particles flow in the reactor are close to plug flow,which verifies the accuracy of simulations.The results provide theoretical guidance for the design and operation of the moving-bed reactor.

关 键 词：移动床反应器 颗粒流动 数值模拟 结构优化 排料系统设计 

分 类 号：TQ53[化学工程—煤化学工程]