管式降膜再沸器内CO_(2)吸收液传热传质性能研究  

Study of heat and mass transfer performance of CO_(2)absorption in the tubular falling film reboiler

作　　者：李蓝茜 许利华[2] 董文峰 吴海茜 方梦祥[1] 夏芝香 王涛[1] 史跃岗[2] 周樟华[2] LI Lan-xi;XU Li-hua;DONG Wen-feng;WU Hai-qian;FANG Meng-xiang;XIA Zhi-xiang;WANG Tao;SHI Yue-gang;ZHOU Zhang-hua(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China;Hangzhou Boiler Group Co.,Ltd.,Hangzhou 310021,China)

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027 [2]杭州锅炉集团股份有限公司,浙江杭州310021

出　　处：《能源工程》2022年第4期1-7,20,共8页Energy Engineering

基　　金：国家重点研发计划(2017YFB0603304)。

摘　　要：在烟气CO_(2)化学捕集系统中,需要高效的再沸器来提供解吸塔内再生的热量和传质动力降膜再沸器能够保证高换热系数、溶液短暂的停留时间和高气液分离度,实现高效换热和降低吸收剂热降解的风险。以不同浓度的单乙醇胺(MEA)溶液作为液相进行单管降膜传热实验,通过计算热通量、降膜换热系数和再生率来探究液相流量、加热功率和液相进口温度对降膜传热效果的影响。实验结果表明,降膜换热系数和再生率随着液相流量的增加先减小后增大;随着加热功率和液相进口温度的增加,降膜换热系数和再生率逐渐增大。同时,在考虑到二次蒸汽影响的条件下,根据实验数据分析得到关于胺溶液的降膜传热实验关联式。In CO_(2) chemical absorption system, efficient reboiler is needed to provide heat and mass transfer power for rich solvent desorption. Falling film reboiler is characteristic of high heat transfer coefficient and short residence time of solvent, which helps realize efficient heat transfer and reduce the risk of thermal degradation of absorbent. In this paper, different concentrations of monoethanolamine(MEA) liquid solution were used to conduct a single tube falling film heat transfer experiment. Through calculation of heat flux, heat transfer coefficient and regeneration rate, the effects of liquid flow rate, heating power and liquid inlet temperature on falling film heat transfer were studied. The experimental results show that the heat transfer coefficient and regeneration rate of falling film decrease first and then increase with the increase of liquid flow rate.With the increase of heating power and liquid inlet temperature, the heat transfer coefficient and regeneration rate of falling film increase gradually. Furthermore, the influence of secondary steamwastaken into consideration, the experimental correlation formula of falling film heat transfer of amine solution was obtained according to experimental data analysis.

关 键 词：降膜蒸发 降膜换热系数 化学吸收法 MEA溶液 管式降膜再沸器 

分 类 号：TK172[动力工程及工程热物理—热能工程]