侧进风盐泥干燥室的流场仿真及结构改进  

Simulation and improvement of flow field in side-entry wind salt mud drying room

作　　者：朱桂华[1,2] 何伟泽 唐浩亭 易山圳 陈勇 Zhu Guihua;He Weize;Tang Haoting;Yi Shanzhen;Chen Yong(College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China;Hunan Zhongda Shanshui Environmental Protection Technology Co.,Ltd.)

机构地区：[1]中南大学机电工程学院,湖南长沙410083 [2]湖南中大山水环保科技有限公司

出　　处：《无机盐工业》2020年第12期80-85,共6页Inorganic Chemicals Industry

摘　　要：为解决侧进风盐泥干燥室内干燥不均匀问题,采用数值模拟、实验研究的方法进行结构改进。基于标准k-ε模型和多孔介质模型对干燥室流场进行数值模拟,测量了风速及干燥后盐泥的含水率,根据结果对干燥室结构进行改进。结果表明:原结构干燥室内热风流动的动力来源主要依靠初速度,在干燥室内流动扩散并产生各种扰动,气流不均匀系数较大,干燥后的盐泥含水率较高且不均匀;改进结构后的干燥室内部形成的压力梯度成为热风流动的驱动力,使热风穿过盐泥层向上运动,气流不均匀系数小,干燥后的盐泥含水率低且较为均匀。对比原结构,改进结构后的干燥室内部气流不均匀系数至少下降27.6%,干燥后的盐泥含水率下降4.48%,含水率不均匀系数下降8.4%。In order to solve the problem of uneven drying of the side-entry salt mud drying room,the structure was improved by numerical simulation and experimental research.Standard k-εmodel and porous medium model were used to simulate the airflow field of the drying chamber,the wind speed and moisture content of dried salt mud were measured,and the drying chamber structure was improved based on the simulation results.The results indicated that the source of power for the hot air flow in the drying room of the original structure mainly depended on the initial velocity,flowed and diffused in the drying chamber and generated various disturbances,the coefficient of uneven airflow was large,and the moisture content of the salt mud after drying was high and uneven;the pressure gradient formed inside the drying chamber after the improved structure became the driving force for the hot air flow,which made the hot air moved upward through the salt mud layer.After the structure was improved,the coefficient of uneven air flow was small,and the moisture content of the dried salt mud was low and relatively uniform.Compared with the original structure,the uneven coefficient of airflow decreased by at least 27.6%,the moisture content of the dried salt mud decreased by 4.48%,and the uneven coefficient of water content decreased by 8.4%.

关 键 词：盐泥 干燥机 流场 数值模拟 不均匀系数 

分 类 号：TK173[动力工程及工程热物理—热能工程]