声波对流化床内水平射流的影响  

Effect of Sound Waves on Horizontal Jet in a Fluidized Bed

作　　者：侯良玉[1] 司崇殿[1] 郭庆杰[1] 

机构地区：[1]青岛科技大学清洁化工过程山东省重点实验室,山东青岛266042

出　　处：《青岛科技大学学报（自然科学版）》2009年第5期418-423,共6页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金项目(20676064);山东省泰山学者建设工程项目(JS200510036);教育部新世纪优秀人才支持计划项目(NCET-07-0473)

摘　　要：在内径140 mm,高1600 mm的声场射流流化床中,以催化裂化催化剂(FCC)和石英砂颗粒为床料,采用光导纤维探针测定了水平射流的射流深度和不同轴/径向位置的颗粒浓度分布。结果表明:射流深度随射流气速、流化数和射流管径的增大而增大,随床料平均粒径和密度的增加而减小,声场的引入可以增大射流深度。声压越大射流深度越大;声波频率在150 Hz时射流深度最大。颗粒浓度沿轴向高度的增大而增大,声波对射流区颗粒浓度没有影响,鼓泡区颗粒浓度随声压级的增大而增大,随声波频率的增大先增大后减小。A cold model of an acoustic jetting fluidized bed with 140 mm in diameter and 1 600 mm high was employed to study the jet penetration depth and the radial and axial profiles of particle concentrations. An optical fiber probe was used to investigate the jet penetration depth. Experimental results indicated that the jet penetration depth increased with increasing fluidizing numbers, jet nozzle diameter and jet velocity. With increasing particle diameter and particle density, the jet penetration depth decreased. The jet penetration depth has a maximum value when the frequency of sound waves was 150 Hz, moreover it decreased as the sound pressure level increased at the same sound frequency. Based on experimental data, two new empirical correlations for prediction of the jet penetration depth were presented, which were in good agreement with the experimental results from this study. The effect of sound waves on the particles concentration was weakened, and even disappeared in the jetting region. The particles concentration increased with an increase in sound pressure level and has a maximal value when the sound frequency was 150 Hz.

关 键 词：声场射流流化床 射流深度 颗粒浓度 

分 类 号：TQ021[化学工程]