化工学报 ›› 2024, Vol. 75 ›› Issue (6): 2166-2179.DOI: 10.11949/0438-1157.20240292
战德康1(), 孙腾1, 王香竹1, 吴明周2, 吴曼1(), 郭庆杰1()
收稿日期:
2024-03-12
修回日期:
2024-04-11
出版日期:
2024-06-25
发布日期:
2024-07-03
通讯作者:
吴曼,郭庆杰
作者简介:
战德康(1998—),男,硕士研究生,zhan_dk@163.com
基金资助:
Dekang ZHAN1(), Teng SUN1, Xiangzhu WANG1, Mingzhou WU2, Man WU1(), Qingjie GUO1()
Received:
2024-03-12
Revised:
2024-04-11
Online:
2024-06-25
Published:
2024-07-03
Contact:
Man WU, Qingjie GUO
摘要:
实际工业生产中颗粒多为非球形颗粒,对颗粒形状效应和液相作用机制的研究不足,是导向管喷动流化床在颗粒涂层改性、包膜等工业应用的关键限制因素。选取粒径、密度相似的球形和圆柱形非球形颗粒为实验物料,对比两种颗粒在不同气速和雾滴引入量下的压力脉动信号频谱分析、信息熵分析,并结合床内气固流动对流型进行划分,绘制非球形湿颗粒流动相图,进而探究喷动流化过程中颗粒形状效应及液相作用机制。相比于球形颗粒,粒径、密度相似的非球形颗粒有较小的最小喷动速度,在喷动过程中有两个及以上较低的主频峰且信息熵较大,显示出非球形颗粒在系统内较高的混乱程度,颗粒之间摩擦、碰撞等降低了导向管内颗粒的固体循环速率。液体的引入增大了环形区颗粒间液桥力,使最小流化速度变大,但液体挥发引起喷动气量增大,使最小喷动速度与最小喷动流化速度减小。在喷动流化流型下引入液体,球形颗粒导向管两端压降ΔpDT的脉动主频降低,而非球形颗粒ΔpDT的主频升高。而且非球形颗粒黏附液体后频谱分析结果显示幅值较大的单一主频峰,表明非球形湿颗粒压力脉动规律性的增强。
中图分类号:
战德康, 孙腾, 王香竹, 吴明周, 吴曼, 郭庆杰. 非球形湿颗粒导向管喷动流化床流动特性[J]. 化工学报, 2024, 75(6): 2166-2179.
Dekang ZHAN, Teng SUN, Xiangzhu WANG, Mingzhou WU, Man WU, Qingjie GUO. Flow characteristics of non-spherical wet particles in a draft tube spout-fluid bed[J]. CIESC Journal, 2024, 75(6): 2166-2179.
图1 导向管喷液喷动流化床实验装置示意图1—空气压缩机;2—减压阀;3—转子流量计;4—管式加热炉;5—液体储槽;6—蠕动泵;7—气体及液体喷嘴;8—温控箱;9—气体分布板;10—玻璃视窗;11—导向管;12—加热带;13—测量孔;14—数据采集卡;15—计算机;16—除尘器
Fig.1 Schematic diagram of experimental device of spout-fluid bed with nozzle spray1—air compressor; 2—pressure reducing valve; 3—rotor flowmeter; 4—tubular heating furnace; 5—liquid storage tank; 6—peristaltic pump; 7—gas and liquid nozzle; 8—temperature control box; 9—gas distribution plate; 10—glass window; 11—guide pipe; 12—heating belt; 13—measuring hole; 14—data acquisition card; 15—computer; 16—dust collector
颗粒 | 形状 | 当量直径dp/mm | 颗粒密度ρp/(kg/m3) | 堆积密度ρb/(kg/m3) | 球形度 | Geldart分类 |
---|---|---|---|---|---|---|
尼龙6 | 圆柱 | 2.62 | 1140 | 778 | 0.71 | Geldart D |
PE | 球形 | 2.80 | 1050 | 800 | 1.00 | Geldart D |
表1 实验所用颗粒的物理性质
Table 1 Physical properties of particles used in experiment
颗粒 | 形状 | 当量直径dp/mm | 颗粒密度ρp/(kg/m3) | 堆积密度ρb/(kg/m3) | 球形度 | Geldart分类 |
---|---|---|---|---|---|---|
尼龙6 | 圆柱 | 2.62 | 1140 | 778 | 0.71 | Geldart D |
PE | 球形 | 2.80 | 1050 | 800 | 1.00 | Geldart D |
气体 | 密度ρ/ (kg/m3) | 比热容cp /(kJ/(kg·K)) | 热导率λ/ (W/(m·K)) | 黏度μ/(Pa·s) |
---|---|---|---|---|
空气 | 1.205 | 1.013 | 2.59×102 | 1.81×10-5 |
表2 实验所用气体的物理性质
Table 2 Physical properties of gases used in experiment
气体 | 密度ρ/ (kg/m3) | 比热容cp /(kJ/(kg·K)) | 热导率λ/ (W/(m·K)) | 黏度μ/(Pa·s) |
---|---|---|---|---|
空气 | 1.205 | 1.013 | 2.59×102 | 1.81×10-5 |
液体 | 密度ρ/(kg/m3) | 比热容cp / (kJ/(kg·K)) | 黏度μ/(Pa·s) |
---|---|---|---|
去离子水 | 998.2 | 4.183 | 1×10-3 |
表3 实验所用液体的物理性质
Table 3 Physical properties of liquid used in experiment
液体 | 密度ρ/(kg/m3) | 比热容cp / (kJ/(kg·K)) | 黏度μ/(Pa·s) |
---|---|---|---|
去离子水 | 998.2 | 4.183 | 1×10-3 |
实验参数 | 符号 | 数值 |
---|---|---|
静床高/mm | H0 | 140 |
夹带高度/mm | Hd | 25 |
喷口直径/mm | Di | 8 |
导向管内径/mm | Dd | 25 |
床层温度/K | T | 293,323 |
喷液量/(ml/min) | L | 3 |
雾化气流速/(m/s) | UL | 5 |
喷动气流速/(m/s) | Us | 0~35 |
流化气流速/(m/s) | Uf | 0~0.7 |
表4 本实验操作参数值
Table 4 Values of each operation parameter in this experiment
实验参数 | 符号 | 数值 |
---|---|---|
静床高/mm | H0 | 140 |
夹带高度/mm | Hd | 25 |
喷口直径/mm | Di | 8 |
导向管内径/mm | Dd | 25 |
床层温度/K | T | 293,323 |
喷液量/(ml/min) | L | 3 |
雾化气流速/(m/s) | UL | 5 |
喷动气流速/(m/s) | Us | 0~35 |
流化气流速/(m/s) | Uf | 0~0.7 |
图9 喷动流化流型下不同颗粒不同喷动气速条件下导向管内压降信号功率谱密度分布
Fig.9 Power spectral density distribution of pressure drop signal in draft tube under different particle and different spouting gas velocity conditions
图10 喷动流化流型不同气速条件下球形颗粒和非球形颗粒信息熵对比
Fig.10 Comparison of information entropy between spherical particles and non-spherical particles under different gas velocities of spouted-fluidized flow patterns
图11 两种颗粒喷动流化流型下固定喷动气速压降熵值随流化气速的变化
Fig.11 Variation of pressure drop entropy of fixed spouting velocity with fluidizing gas velocity under two particle spouted-fluidized flow patterns
图12 两种颗粒喷动流化流型下固定流化气速信息熵值随喷动气速的变化
Fig.12 Change of fixed fluidization gas velocity information entropy with spouting gas velocity under two particle spouted-fluidized flow patterns
图13 球形颗粒与非球形圆柱颗粒喷液量为3 ml/min时不同气速下流型
Fig.13 Flow patterns of spherical particles and non-spherical cylindrical particles with spray volume of 3 ml/min at different gas velocities
图14 不同颗粒喷动流化流型引入液滴导向管两端压降信号功率谱密度分布的变化
Fig.14 Change of power spectral density distribution of pressure drop signal at both ends of droplet draft tube introduced by different particle spouted-fluidized flow patterns
图15 不同颗粒喷动流化流型引入液滴导向管两端压降的变化
Fig.15 Pressure drop changes at both ends of droplet draft tube introduced by different particle spouted-fluidized flow patterns
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