阵列式直通道填料塔用于氨氮废水吹脱的性能研究  

Air Stripping of Ammonia Using a Packed Tower with Array Straight Channel Filler

作　　者：代明星[1] 全学军[1] 徐飞[1] 罗丹[1] 吴俊[1] 李瑞恒[1] 谢清伟[1] DAI Ming-xing QUAN Xue-jun XU Fei LUO Dan WU Jun LI Rui-heng XIE Qing-wei(College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054,Chin)

机构地区：[1]重庆理工大学化学化工学院,重庆400054

出　　处：《重庆理工大学学报（自然科学）》2017年第3期90-96,115,共8页Journal of Chongqing University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(21176273);重庆市百名工程技术高端人才培养计划项目(渝科委发[2014]5号)

摘　　要：空气吹脱广泛用于废水中脱氨,实现这一过程的传质设备主要是填料塔,为了提高过程的传质效率和避免填料运行过程中的堵塞,提出了一种新型填料塔——阵列式直通道填料塔,并对废水中氨的吹脱进行了实验。与传统的吹脱设备相比,此类填料塔表现出较好的气-液传质性能,使氨氮的吹脱效率大大提高。在一定温度条件下,空气流量和液体循环流量是影响吹脱过程中氨体积传质系数的主要因素。体积传质系数均随空气流量和液体循环流量的增加而增大。实验表明:在空气流速Q_G=60 m^3/h、液体循环流速Q_L=2.5 m3/h时,体积传质系数达0.041 1 min^(-1),吹脱90 min氨的去除率达97.39%。该新型填料塔,经过较长时间的分离操作,没发现明显的填料堵塞问题,对于实现工业化放大有重要意义。Air stripping is widely used in the removal of ammonia from wastewate,and the usually used mass transfer equipment is mainly packed tower. In order to improve the efficiency of this process,air stripping of ammonia from water was performed in batch mode in a newly designed packedtower： an array straight channel packed tower. The effect of main process parameters on ammonia removal and mass transfer coefficient was investigated. The new packed tower exhibited excellent mass transfer coefficient compared with traditional stripping tanks and packed towers. Under a certain temperature,liquid flow rate and air flow rate were the main factors affecting the mass transfer coefficient. Volumetric mass transfer coefficients increased with the increasing of air flow rate and liquid circulation flow rate rapidly. Experiments show that when the air flow rate QGwas 60 m^3/h and liquid flow rate QL was 2. 5 m^3/h,the mass transfer coefficient reached 0. 041 1 min^-1,ammonia removal rate reached 97. 39% after 90 min of operation. The air stripping process could be operated continuously for a longer time because there was no congestion,and there is an important significance for industrial application.

关 键 词：空气吹脱 脱氨 传质系数 阵列式直通道填料塔 

分 类 号：TQ028[化学工程] X505[环境科学与工程—环境工程]