摘要
为了探索用于煤直接液化工艺的强制内循环浆态床反应器内部煤浆的流动状态,采用"煤粉-水-空气"系统,研究了非反应状态下煤粉颗粒的分布、煤浆流速分布和床层压力脉动分布的规律。结果表明:在冷模反应器直径为200 mm、空气的空塔流速为3.9~5.3 cm/s、煤浆的空塔流速为4.5~12.5 cm/s的操作范围内,强制内循环反应器内空间各点的煤粉颗粒分布均匀,其质量分数与进料中煤粉质量分数相一致,没有发生煤粉颗粒的沉积现象;相对于鼓泡床反应器,强制内循环浆态床反应器内煤粉的径向流速更均匀,能够减少或避免大密度固体颗粒在反应器内的沉积现象;强制内循环浆态床反应器内部构件影响流体的流动状态,分布盘的上侧和循环杯的下侧都存在着较强的煤浆湍动和返混现象。
This paper investigates the distributions of coal concentration,coal slurry and fluctuation of bed′s pressure based on "coal-water-air" system in a non-reaction status in order to explore the flow characteristics of coal slurry in the forced inner recycling reactor used in coal direct liquefaction technology.With the following experimental condition: air′s superficial velocity of 3.9-5.3 cm/s and coal slurry′s superficial velocity of 4.5-12.5 cm/s in a cold model reactor with diameter of 200 mm,the results indicate that the coal concentration is narrowly distributed inside the reactor and equals to that of the feedstock without sedimentation of coal particles.The forced inner recycling reactor is better than bubbling reactor because it can alleviate or avoid the deposition of solid particles with high density due to the uniform distribution of velocity.The internals influence the flow status with intensive turbulence and back-mixing between distribution plate and recycle cup.
出处
《华东理工大学学报(自然科学版)》
CAS
CSCD
北大核心
2010年第3期317-322,共6页
Journal of East China University of Science and Technology
关键词
强制内循环反应器
浆态床
流动特性
煤浆
forced inner recycling reactor
slurry bed
flow characteristics
coal slurry