Experimental study of the flow and heat transfer of a gas–water mixture through a packed channel

作     者：Xiaolei Zhu Xiaofeng Sui Yan Zhao Ji'an Meng Zhixin Li 

作者机构：School of Aerospace Tsinghua University Beijing Yuanshen Energy Saving Technology Co. Ltd. Thermal Research Institute Tianjin University 

出 版 物：《Science Bulletin》 (科学通报（英文版）)

年 卷 期：2016年第61卷第5期

页      面：406-415页

核心收录：

学科分类：080703[工学-动力机械及工程] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：support extended by the National Basic Research Program of China(2013CB228301)is gratefully acknowledged 

主　　题：Flue gas waste heat recovery Flow and heat transfer Moist air Packed heat exchanger tower 

摘      要：Waste heat recovery from the flue gas of gasfired boilers was studied experimentally by measuring the flow and heat transfer of air and water through six kinds of packing with saturated humid air as the simulated flue *** experiments measured the effects of inlet air temperature, inlet air velocity and circulating water flow rate on the flow and heat transfer. The results show that higher inlet air temperatures and lower inlet air velocities lower the flow resistance and increase the heat transfer coefficient. The stainless steel packing had better surface wettability and larger thermal conductivity than the plastic packing, which enhanced the heat transfer between the water and the saturated moist air. When both the flow resistance reduction and the heat transfer enhancement were considered, the experimental results gave an optimal packing-specific surface area. A packed heat exchanger tower was designed for waste heat recovery from the flue gas of gas-fired boilers based on the experimental results which had better flow and heat transfer characteristics with lower pump and fan power consumption, more stable system operation and less thermal fluctuations compared with a non-packed heat transfer system with atomized water.