基于XCT的气固流化床布风板射流特征研究

doi:10.11949/0438-1157.20210298

摘要/Abstract

摘要：

构建了X光层析成像（XCT）气固流动参数测量系统，基于锥形束滤波反投影算法（FDK）开发了CT三维重建软件，并设计了射流识别及量化算法。基于以上方法获得了不同流化风速下床料粒径d_p、布风板孔口直径d₀和布风板孔口均分面积A₀对射流形态结构和几何特征的影响规律。结果表明平均射流长度L、最大直径D和体积V与床料粒径d_p成反比，与孔口直径d₀和孔口均分面积A₀成正比，最终拟合了流化床平均射流长度关联式。

关键词: X光层析成像测量系统, 流化床, 射流, 介尺度, 多相流

Abstract:

An X-ray computed tomography (XCT) gas-solid flow parameter measurement system was constructed. The CT 3D reconstruction software was developed based on the cone beam filtered back projection algorithm (FDK), and the jet identification and quantification algorithm was designed. Based on the above method, the influence of bed material particle d_p, the aeration plate orifice diameter d₀, and the aeration plate orifice average area A₀ on jet shape and geometric characteristics at different fluidization gas velocity are obtained. The results show that the average jet length L, the maximum diameter D, and the volume V are inversely proportional to the bed material particle d_p, and directly proportional to the orifice diameter d₀ and the average orifice area A₀. Finally, the correlation equation of the average jet length of the fluidized bed is fitted.

Key words: XCT, fluidized-bed, jetting, mesoscale, multiphase flow

中图分类号:

TK 175

刘曙光, 钟文琪, 陈曦. 基于XCT的气固流化床布风板射流特征研究[J]. 化工学报, 2021, 72(9): 4553-4563.

Shuguang LIU, Wenqi ZHONG, Xi CHEN. Experiment study of jetting characteristic in gas-solid fluidized bed using X-ray computed tomography[J]. CIESC Journal, 2021, 72(9): 4553-4563.

图/表 25

图1 X光层析成像实验装置示意图

Fig.1 Schematic diagram of X-ray tomography experimental setup

表1 床料颗粒物性

Table 1 Properties of bed material particles

材料	直径d_p/ mm	密度ρ_p/ （kg/m³）	空隙率ε_b	最小流化速度U_mf/(m/s)
石英砂	0.20~0.35	2650	0.50	0.07
石英砂	0.35~0.45	2650	0.48	0.14
石英砂	0.45~0.60	2650	0.45	0.29

图2 A类型布风板（a）；B类型布风板（b）

Fig.2 A-type aeration plate (a); B-type aeration plate (b)

表2 布风板结构参数

Table 2 Structural parameters of aeration plate

布风板类型	孔口数量n₀	孔口直径d₀/mm	孔口均分面积A₀/mm²
A-1	37	1	212
A-1.5	37	1.5	212
A-2	37	2	212
B-1	61	1	129

图3 立方体塑料框架

Fig.3 Cube plastic frame

图4 射流横截面

Fig.4 Jet cross section

图5 射流灰度图（a）；射流二值图（b）

Fig.5 Jet gray image (a); Jet binary image (b)

图6 射流3D重建图像

Fig.6 Jet 3D reconstruction image

图7 不同床料粒径下射流x切片灰度图/二值图

Fig.7 Jet x-slice gray image/binary image with different bed material size

图8 不同床料粒径下射流3D图

Fig.8 Jet 3D image with different bed material size

图9 平均射流长度L随平均射流速度Uj的变化趋势

Fig.9 Variation of average jet length L with jet velocity Uj

图10 平均射流最大直径D随平均射流速度Uj的变化趋势

Fig.10 Variation of average jet diameter D with jet velocity Uj

图11 平均射流体积V随平均射流速度Uj的变化趋势

Fig.11 Variation of average jet volume V with jet velocity Uj

图12 不同孔口直径下射流3D图

Fig.12 Jet 3D image with different orifice diameter

图13 平均射流长度L随平均射流速度Uj的变化趋势

Fig.13 Variation of average jet length L with jet velocity Uj

图14 平均射流最大直径D随平均射流速度Uj的变化趋势

Fig.14 Variation of average jet diameter D with jet velocity Uj

图15 平均射流体积V随平均射流速度Uj的变化趋势

Fig.15 Variation of average jet volume V with jet velocity Uj

图16 不同孔口均分面积下射流3D图

Fig.16 Jet 3D image with different orifice average area

图17 平均射流长度L随平均射流速度Uj的变化趋势

Fig.17 Variation of average jet length L with jet velocity Uj

图18 平均射流最大直径D随平均射流速度Uj的变化趋势

Fig.18 Variation of average jet diameter D with jet velocity Uj

图19 平均射流体积V随平均射流速度Uj的变化趋势

Fig.19 Variation of average jet volume V with jet velocity Uj

图20 不同床料粒径下射流长度散点图和拟合曲线

Fig. 20 Jet length scatter plot and fitting curve with different bed material size

图21 不同孔口直径下射流长度散点图和拟合曲线

Fig. 21 Jet length scatter plot and fitting curve with different orifice diameter

图22 不同孔口均分面积下射流长度散点图和拟合曲线

Fig. 22 Jet length scatter plot and fitting curve with different orifice average area

图23 不同射流长度关联式对比

Fig. 23 Comparison of different jet length correlations

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