CIESC Journal ›› 2005, Vol. 56 ›› Issue (10): 1869-1874.
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LUO Zhongyang;WU Xuecheng;WANG Qinhui;GAO Qiong;FANG Mengxiang;CEN Kefa
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骆仲泱;吴学成;王勤辉;高琼;方梦祥;岑可法
Abstract: By using an advanced measurement system composed of a high-speed digital video camera and a high-power laser sheet, an experimental research was carried out on the particle rotation characteristics in a cold Circulating Fluidized Bed (CFB) riser with square cross-sectional area of 200 mm×200 mm and height of 4 m.Particle movement images were analyzed with Matlab, PhotoShop and ACDSee software, captured at 13 measurement points in a quarter of a cross-section in the upper dilute phase area of the CFB riser.Particle rotation speed was observed and checked by the dual-frequency method. The results showed that the particle rotated when moving along the riser in gas-solid two-phase flow of the CFB riser, and the average particle rotational speed in the wall area was higher than that in the center area in the testing cross-section. Those particles, with either relatively smaller diameter or higher radial component of velocity,were inclined to have a higher rotational speed. The average rotational velocity of irregular particles was obviously higher than that of regular ones.Average particle rotational velocity in the CFB riser was 300 r8226;s-1 and maximum rotational velocity was 2000r8226;s-1 at superficial gas velocity Vg=5 m8226;s-1,recycling solids mass flux Gs=1.5 kg8226;m-28226;s-1 and particle average diameter dp=0.5 mm.
Key words: 高速数字摄影, 循环流化床, 气固两相流, 颗粒旋转
摘要: 利用由高速数字摄影设备及大功率激光构成的测试系统在一截面为200 mm×200 mm、高为4 m的冷态循环流化床实验台上进行了床内颗粒旋转特性的实验研究.对在距布风板3.54 m高度的稀相区的1/4截面内13个测试点拍摄获得的图像序列利用Matlab、PhotoShop和ACDSee软件进行分析处理,采用人工直接判别获得颗粒转速,用双帧频验证法进行颗粒转速校验.结果表明:循环流化床气固两相流中固相颗粒普遍存在旋转现象,截面边壁区内的颗粒平均转速高于中心区域;粒径小或径向速度大的颗粒,其平均转速较大,反之亦然;不规则颗粒的平均转速明显高于球[JP2]形颗粒;当空截面气体速度Vg=5 m8226;s-1,固体质量循环流率Gs=1.5 kg8226;m-28226;s-1,玻璃珠颗粒平均粒径dp=0.5 mm时,颗粒转速最高可达2000 r8226;s-1,平均转速300 r8226;s-1.
关键词: 高速数字摄影, 循环流化床, 气固两相流, 颗粒旋转
LUO Zhongyang, WU Xuecheng, WANG Qinhui, GAO Qiong, FANG Mengxiang, CEN Kefa. Particle rotation characteristics in CFB riser[J]. CIESC Journal, 2005, 56(10): 1869-1874.
骆仲泱, 吴学成, 王勤辉, 高琼, 方梦祥, 岑可法. 循环流化床中颗粒旋转特性 [J]. 化工学报, 2005, 56(10): 1869-1874.
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