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

  • WEI Hongyang ,
  • HUANG Shifang ,
  • MA Yuxin ,
  • CHEN Bo ,
  • SUN Li ,
  • ZHANG Xiaosong
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  • 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

网络出版日期: 2024-04-30

基金资助

The research described in this paper is supported by the National Key Research and Development Program of China (No. 2022YFB4100500), National Natural Science Foundation of China (No. 52276003 and 52206005), and China Postdoctoral Science Foundation (No. 2020M681452).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024

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

  • WEI Hongyang ,
  • HUANG Shifang ,
  • MA Yuxin ,
  • CHEN Bo ,
  • SUN Li ,
  • ZHANG Xiaosong
Expand
  • 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

Online published: 2024-04-30

Supported by

The research described in this paper is supported by the National Key Research and Development Program of China (No. 2022YFB4100500), National Natural Science Foundation of China (No. 52276003 and 52206005), and China Postdoctoral Science Foundation (No. 2020M681452).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024

摘要

从低品位烟气中回收热量和水分对于节能和环保都至关重要。全开式吸收式热泵作为一种新型的烟气余热回收技术,具有实现烟气全热深度回收的潜力,但作为系统主要部件的开式再生器缺乏相应的热质传递性能研究,对系统的设计和运行造成了困扰。本文实验研究了装备有陶瓷规整填料的开式喷淋塔(再生器)的再生性能,并提出了两种不同的再生模式,包括空气接收模式和烟气接收模式,以分别利用环境空气和低品位烟气作为再生驱动源。研究并揭示了不同输入参数对再生特性的影响,包括换热量、再生速率、热效率和湿效率。研究结果表明,在两种再生模式中,通过增加溶液流速、溶液温度和空气/烟气流速均可以强化再生性能。然而,溶液浓度和烟气含湿量升高均会减小再生速率,并降低再生热效率。对于55%质量浓度的氯化钙水溶液,温度为200摄氏度、含湿量为44克/千克的烟气可以驱动溶液再生过程,当溶液浓度或烟气含湿量继续上升时,溶液再生过程需要额外的能量输入。此外,本文对上述过程的耦合热质传递系数进行了测试和计算,并构建了耦合热质传递关联式,可为全开式吸收式热泵中开式再生器的设计和优化提供基础。

本文引用格式

WEI Hongyang , HUANG Shifang , MA Yuxin , CHEN Bo , SUN Li , ZHANG Xiaosong . Experimental Investigation on Solution Regeneration Performance and Coefficients in Full-Open System for Heat and Water Recovery of Flue Gas[J]. 热科学学报, 2024 , 33(3) : 1094 -1108 . DOI: 10.1007/s11630-024-1978-0

Abstract

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 CaCl2-H2O with a concentration of 55%, flue gas around 200°C 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.

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