沸石13X在开式吸附储热中“反应波”现象研究

doi:10.19799/j.cnki.2095-4239.2020.0333

储能科学与技术 ›› 2021, Vol. 10 ›› Issue (2): 497-505.doi: 10.19799/j.cnki.2095-4239.2020.0333

沸石13X在开式吸附储热中“反应波”现象研究

董浩晖(), 王丽伟()

上海交通大学制冷与低温工程研究所，上海 200240

收稿日期:2020-09-28 修回日期:2020-11-05 出版日期:2021-03-05 发布日期:2021-03-05
作者简介:董浩晖（1995—），男，硕士研究生，研究方向为吸附储热机理和系统，E-mail：harvey_dong@163.com|王丽伟，教授，主要研究方向为吸附式制冷与热工转换和传热传质强化等，E-mail:lwwang@sjtu.edu.cn。
基金资助:
国家杰出青年基金项目(51825602)

Investigating on the “reaction wave” phenomenon of zeolite 13X for open sorption heat storage

Haohui DONG(), Liwei WANG()

Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2020-09-28 Revised:2020-11-05 Online:2021-03-05 Published:2021-03-05

摘要/Abstract

摘要：

开式吸附储热是一种新型的太阳能、工业余热或低谷电力驱动的建筑清洁供热技术，而当前缺乏对其输出性能(温度稳定性、持续时长)进行准确解释和预测的理论模型，阻碍了其大规模推广应用。本文从吸附原理和反应过程出发，阐释了开式吸附反应床内的“反应波”(即匀速移动的反应区)的进入、移动和移出的过程导致了输出温度曲线的上升、稳定和下降阶段，给出了基于反应波特性参数(波长、波速)和反应床长度来计算稳定输出时长的理论公式。为了进一步研究实际运行时影响输出性能的主要因素，选用广泛应用在开式吸附储热器中的沸石13X为代表吸附剂，设计并搭建了一台红外相机观测装置。基于测得的反应床内各处吸附剂的温度变化计算得到反应波的波长和波速，进而得到反应波在整个吸附过程中的波形变化和移动情况。重点研究了入口空气相对湿度、风速和吸附剂粒径对波长和波速的影响，并比较了稳定输出时长的测量值和计算值，可用于指导采用沸石13X的开式吸附反应床设计。

关键词: 吸附储热, 反应波, 波长, 波速, 稳定输出

Abstract:

Open sorption heat storage is a novel technology for space heating in buildings driven by solar energy, industrial waste heat or off-peak electricity, which can effectively ease energy stress and reduce the electric load. However, its large-scale applications are hindered by the lack of accurate predictions of the output performances during the discharging process. In this study, we explained how the entrance, motion, and exit processes of the "reaction wave" (the moving reaction section with a constant speed) directly lead to the increasing, stable, and decreasing output temperature curve. The theoretical formula for the lasting time of the stable process was given. Moreover, zeolite 13X, which has been fully used in open sorption heat storage reactors, was chosen as the sorbent to study the main influencing factors on the output performance. Accordingly, an observation device based on an infrared camera is designed and established. The changes in the wave shape and movement of the reaction wave were obtained from calculations based on the recorded sorbent temperature inside the reactor during the whole sorption process. Moreover, the influences on wavelength and wave speed of the relative humidity, air velocity, and the particle size of zeolite 13X were investigated. The calculated and measured values of the lasting time of the stable output process were compared. The results could contribute to designing reactors using zeolite 13X.

Key words: sorption heat storage, reaction wave, wavelength, wave speed, stable output

中图分类号:

TK 02

董浩晖, 王丽伟. 沸石13X在开式吸附储热中“反应波”现象研究[J]. 储能科学与技术, 2021, 10(2): 497-505.

Haohui DONG, Liwei WANG. Investigating on the “reaction wave” phenomenon of zeolite 13X for open sorption heat storage[J]. Energy Storage Science and Technology, 2021, 10(2): 497-505.

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部件名称	尺寸
石英玻璃管	内径40 mm，壁厚2 mm，长500 mm
PVC管	内径为38 mm，长50 mm
不锈钢过滤塞	外径39 mm，长度15 mm
观察窗	480 mm×25 mm
橡塑保温棉	厚度50 mm

No.	粒径/mm	吸附工况/℃	RH_in/%	v_in/m·s^-1	L/mm	孔隙率
1	2.70	20	38	0.16	109.00	0.45
2	2.70	20	60	0.16	108.00	0.44
3	2.70	20	70	0.16	109.00	0.45
4	2.70	20	60	0.31	108.00	0.43
5	2.70	20	60	0.38	109.00	0.45
6	4.10	20	60	0.16	150.00	0.43
7	5.05	20	60	0.16	200.00	0.48

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沸石13X在开式吸附储热中“反应波”现象研究

Investigating on the “reaction wave” phenomenon of zeolite 13X for open sorption heat storage

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