立体传质塔板帽罩空间浓度分布  

Spatial Concentration Distribution of Combined Trapezoid Spray Tray

作　　者：王志英[1] 刘启东[2] 刘继东[1] 李春利[1] 

机构地区：[1]河北工业大学化工学院,天津300130 [2]天津市普莱特科技发展有限公司,天津300384

出　　处：《天津大学学报》2010年第3期277-282,共6页Journal of Tianjin University(Science and Technology)

基　　金：河北省自然科学基金资助项目(B2007000021)

摘　　要：立体传质塔板(CTST)罩体空间的浓度分布规律是板效率研究的基础.在φ600,mm的冷模实验塔内用富含CO2水-空气系统对CTST帽罩空间的气、液相浓度分布进行了测量.结果发现,罩内液相浓度沿帽罩高度方向总体呈降低趋势,同一高度上罩外液相浓度始终低于罩内液相浓度,气相浓度分布与液相浓度分布趋势相反;在帽罩的提升段,靠近喷射板的液相浓度明显高于中心位置的液相浓度,在喷射段,喷射板附近和帽罩中心的液相浓度则相差不大;正常操作条件下,提升段、喷射段和罩外传质量占总传质量的比率分别为50%～70%、10%～17%和20%～35%.考察了板孔气速和液体流量对罩体空间各区域传质量分配的影响.结果表明,随着板孔气速或液体流量的增大,提升段传质量比率减小,喷射段传质量比率增大.Combined trapezoid spray tray （CTST） is one of new spray trays. Concentration distribution in the three- dimensional trapezoid cap is a key factor in tray efficiency study. Spatial concentration distribution of liquid and gas phases of CTST was measured in an experimental column with diameter of 600 mm, adopting enriched carbon dioxide water-air system. Results show that the liquid phase concentration in the cap decreased with the increase of height. And the liquid phase concentration out of the cap was always lower than that of the inside at the same plane. While the gas phase concentration distribution was just the contrary. In lifting region, the liquid concentration near spray plate was obviously higher than that of the center of the cap. While in spraying region, the liquid concentration near spray plate was approximately the same as that of the center of the cap. Mass transfer distribution of the cap unit was calculated. Result indicates that the mass transfer percentages of lifting region, spraying region and external cap were 50%--70%, 10%--17% and 20%--35% respectively under ordinary operational conditions. Effects of gas velocity in plate hole and of liquid flow rate on mass transfer distribution were studied. Results reveal that the mass transfer percentage of lifting region decreased as the mass transfer percentage of spraying region increased with increasing gas velocity in plate hole or liquid flow rate.

关 键 词：塔板 立体传质塔板 浓度分布 传质 

分 类 号：TQ053.5[化学工程]