摘要
为了考察多射流锥形对撞煤加氢气流床内的冷态流场情况,以3 t/d的热态煤加氢气化炉为依据建立了气流床冷模装置。使用三维动态颗粒分析仪(3D-PDA)对气流床内的速度场进行了测量,同时使用Fluent软件,采用κ-ε模型对气流床内的流动情况进行了模拟研究,模拟结果与实验结果能较好地吻合。结果显示:多射流锥形对撞气流床内的流体流动分为对撞区、射流区、回流区和管流区,在考察范围内,随着进气速度的增加,回流区的体积占比先增大后减小;随中心喷嘴携带气速度的增加,射流区速度增大,且较进气速度的影响更为敏感;适当增加进气角度,则会降低射流区速度,增大回流区体积。
In order to investigate the cold flow field on the multi nozzle impinging coal hydrogenationentrained flow bed, the cold model of a stream bed was established based on the 3 t/d thermal coalhydrogenation gasifier. The three-dimensional particle dynamic analyzer (3D-PDA) was used to measure thevelocity of the fluid in the model and the flow behaviors were simulated and analyzed using Fluent softwareand κ-ε dual equation model. It was found that the simulations are well consistent with the experimentalresults and the flow field can be catalogued into four zones: impinging stream, jet stream, recirculationstream and tube zone. With the increase of the gas inlet velocity, the volume percent of the recirculationstream zone increased and then followed by the decrease within the scope of the study. The rate of the jetstream zone increased with the increase of central nozzle carrying gas velocity, and its influence showedmore sensitive than that of the intake velocity; with appropriately increase of the intake angle, the velocity ofthe jet stream zone would be reduced and the volume of the recirculation stream zone increased.
作者
张金阁
曲旋
张荣
毕继诚
Zhang Jinge;Qu Xuan;Zhang Rong;Bi Jicheng(Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030000, China;University of Chinese Academy of Sciences, Beijing 100049, China)
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
2016年第1期1-7,共7页
Chemical Reaction Engineering and Technology
基金
"863计划"煤制天然气新工艺关键技术研究(2011AA05A201)
煤转化国家重点实验室自主研究课题(2014BWZ001)
关键词
煤加氢气化
气流床
对撞流
流场特性
gasification of coal hydrogenation
entrained-flow bed
impinging stream
flow characteristics