Effect of adsorption process intensification for high-temperature steam generation in adsorption heat pump

Linsheng ZHANG; Zhouming LIU; Guangyao LI; Tingting CHEN; Bing XUE

doi:10.11949/0438-1157.20190378

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Effect of adsorption process intensification for high-temperature steam generation in adsorption heat pump

Fluid dynamics and transport phenomena | 更新时间：2020-06-24

- Effect of adsorption process intensification for high-temperature steam generation in adsorption heat pump
- CIESC Journal Vol. 70, Issue 11, Pages: 4172-4180(2019)
- 作者机构：
  
  1.School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, Henan, China
  2.Vatti Co., Ltd., Zhongshan 528415, Guangdong, China
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190378
  CLC： TQ 083⁺.4
- Received：11 April 2019，
  
  Revised：2019-07-03，
  
  Published：05 November 2019
- 稿件说明：
移动端阅览
张林生, 刘周明, 李光耀, 陈婷婷, 薛冰. 吸附过程强化对提升高温热泵蒸汽生成性能的影响[J]. 化工学报, 2019, 70(11): 4172-4180

ZHANG Linsheng, LIU Zhouming, LI Guangyao, CHEN Tingting, XUE Bing. Effect of adsorption process intensification for high-temperature steam generation in adsorption heat pump[J]. CIESC Journal, 2019, 70(11): 4172-4180
张林生, 刘周明, 李光耀, 陈婷婷, 薛冰. 吸附过程强化对提升高温热泵蒸汽生成性能的影响[J]. 化工学报, 2019, 70(11): 4172-4180 DOI： 10.11949/0438-1157.20190378.

ZHANG Linsheng, LIU Zhouming, LI Guangyao, CHEN Tingting, XUE Bing. Effect of adsorption process intensification for high-temperature steam generation in adsorption heat pump[J]. CIESC Journal, 2019, 70(11): 4172-4180 DOI： 10.11949/0438-1157.20190378.

摘要

在基于直接接触换热法的开式吸附热泵系统中，引入预吸附过程或预设传质通道，考察其对蒸汽生成和系统性能的影响。实验结果表明，预吸附蒸汽压力为0.0680 MPa(饱和温度=89.2℃)，系统生成高温蒸汽的平均温度为203℃，系统整体温升为98.4℃，相对于无预吸附系统，生成蒸汽的时间和质量分别增加52.2%和27.0%，系统制热系数和制热功率分别提升28.2%和27.2%。预置树枝状传质通道后，生成蒸汽的时间和质量分别增加了17.8%和8.75%，系统制热系数和制热功率分别提升8.16%和9.05%。预吸附过程使吸附床较快达到整体吸附和热力平衡，缩短蒸汽到达床层出口的时间。预吸附压力越高，系统到达整体吸附平衡的用时越短，蒸汽生成时间越早。传质通道促进吸附床局部平衡的达成，减小局部传质阻力，使部分蒸汽可迅速到达出口。整体和局部吸附平衡的快速达成，均强化了蒸汽的动态生成过程，提升系统整体性能。

Abstract

In the open adsorption heat pump system based on direct contact heat transfer method

a pre-adsorption process or a preset mass transfer channel is introduced to investigate its influence on steam generation and system performance. In this paper

experimental working principle of high-temperature steam generation from hot water is described as a comparison. Then cyclic test with pre-adsorption units (saturation temperature=74.0℃ and 89.2℃) and mass transfer channels (branch shape and coiler shape) are conducted. The results show that after adding the pre-adsorption process(saturation temperature=89.2℃)

the average temperature of the generated steam is 203 ̊C and GTL (gross temperature lift) of the system is 98.4 ̊C. Steam generation time was 131 s earlier than the comparative experiment

effective time ratio for steam generation is elevated by 52.2% and mass of generated steam is raised by 27.0%. COP

(heating coefficient of performance) and SHP

(specific heating power for steam generation)are improved by 28.2% and 27.2%

respectively. When presetting branch shape channel inside the adsorption bed

effective time ratio for steam generation is elevated by 17.8% and mass of generated steam is raised by 8.75%. COP

and SHP

are increased by 8.16%and 9.05%

respectively.The pre-adsorption process allows the adsorption bed to reach the entire adsorption and thermal equilibrium faster. As a result

the generated high temperature steam arrives the top exit earlier. Besides

the local adsorption equilibrium is promoted on account of the mass transfer channel

which also reduces the local mass transfer resistance and makes a part of generated steam leave the pocked bed quickly. These results indicate that with the rapidly achievement of the entire and local adsorption equilibrium

the dynamic steam generation process is successfully intensified and the system performance is significantly improved.

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