Experimental Investigation on Solution Regeneration Performance and Coefficients in Full-Open System for Heat and Water Recovery of Flue Gas  

作　　者：WEI Hongyang HUANG Shifang MA Yuxin CHEN Bo SUN Li ZHANG Xiaosong 

机构地区：[1]School of Energy and Environment,Southeast University,Nanjing,210096,China [2]MOE Engineering Research Center for Building Energy Equipment&Environment,Southeast University,Nanjing,210096,China [3]Jiangsu Frontier Electric Technology Co.,Ltd,Nanjing,211106,China

出　　处：《Journal of Thermal Science》2024年第3期1094-1108,共15页热科学学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2022YFB4100500);National Natural Science Foundation of China(No.52276003 and 52206005);China Postdoctoral Science Foundation(No.2020M681452)。

摘　　要：The recovery of heat and water from low-grade flue gas is of considerable importance for energy conservation and environmental preservation.While the full-open absorption heat pump shows promise as a means of achieving heat and water recovery,the lack of research on heat and mass transfer performance of open-type solution evaporation regeneration represents a significant impediment to its design and operation.This paper experimentally investigates the regeneration performance of an open-type spaying tower equipped with ceramic structured packings.Two different regeneration modes are proposed,namely ambient air receiver mode and flue gas receiver mode,to utilize air or low-grade flue gas as a driving source.The impact of different input parameters on the regeneration characteristics,including heat transfer capacity,water removal rate,thermal efficiency,and humidity effectiveness,are demonstrated.The findings indicate that the enhancement of regeneration can be achieved through the increase of solution flow rate,solution temperature,and flue gas flow rate in both regeneration modes.However,high solution concentration and flue gas humidity ratio can weaken water removal rates and reduce thermal efficiency.For the regeneration of CaCl_(2)-H_(2)O with a concentration of55%,flue gas around 200℃with a humidity ratio below 44 g/kg can successfully drive the solution regeneration process.When the solution concentration or flue gas humidity ratio continues to rise,additional energy is necessary for regeneration.Furthermore,the coupled heat and mass transfer coefficients are fitted,which can contribute to the design and optimization of the open-type regenerator.

关 键 词：heat and water recovery solution regeneration flue gas regeneration performance coefficient 

分 类 号：TK115[动力工程及工程热物理—热能工程]