液相对喷雾气固流化床内气泡影响的分析  

Analysis of influence of liquid on bubbles in spray gas-solid fluidized bed

作　　者：周云龙[1] 卢志叶 王猛 ZHOU Yun-long;LU Zhi-ye;WANG Meng(School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,Jilin Province, China;CCCC Gas&Heat Research and Design Institute Limited Company,Shenyang 110000, Liaoning Province,China)

机构地区：[1]东北电力大学能源与动力工程学院,吉林吉林132012 [2]中交煤气热力研究设计院有限公司,辽宁沈阳110000

出　　处：《化学工程》2018年第11期30-34,共5页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(51276033)

摘　　要：气泡特性作为气固流化床的基本特征之一,在流化床设计中非常重要。当液体进入流化床后,先与颗粒发生作用,进而影响流化床中的气泡行为。文中以图像处理技术为基础,通过实验研究不同表观气速、液体黏度以及液体含量下的流化床气泡面积变化规律,结果表明:气泡面积与表观气速呈正比关系,且当气速变化时,气泡形心位置均随其线性增加;液体黏度逐渐增加,气泡面积呈现下降趋势,直至气泡逐渐消失;液体含量对床内上下区域内的气泡面积影响各不相同;同时分析压力信号的功率谱密度也可以反映气泡的活跃程度。As one of the most basic characteristics of spray gas-solid fluidized bed,bubble characteristics are very important in the design of fluidized beds.In the spray fluidized bed,the entering liquid reacts with particles,which affects the bubble behavior.Taking advantage of image processing technology,the bubble area variation under different fluidization superficial velocity,liquid viscosity and liquid mount in the fluidized bed were studied.The results show that the fluidization superficial velocity is in proportional to the bubbles area.When the superficial velocity changes,the bubble centroid position rises linearly with it.Bubble area decreases as the liquid viscosity increases till the bubbles gradually disappear.Liquid amount has different influence on bubble area up and down the fluid bed.At the same time,analyzing the power spectral density of the pressure signal can also reflect the activity of the bubble.

关 键 词：流化床 液体黏度 气泡面积 图像处理技术 

分 类 号：O359.2[理学—流体力学]