论文总字数：21215字

摘 要

MIL-101与水等制冷剂组成工质对应用于吸附式制冷领域具有比表面积大、吸附容量高、再生温度较低等优势，但堆密度低、导热性能差。因此，强化MIL-101导热性能是提高其吸附制冷效率关键技术之一。本文选用泡沫铜为金属载体，通过浸涂法制备MIL-101/泡沫铜涂层，并考察涂层悬浮液中MIL-101和水质量比，泡沫铜孔隙率等参数对MIL-101/泡沫铜涂层性能的影响；采用Hot disk热常数分析仪测定了MIL-101/泡沫铜涂层热导率，并考察其对水的吸附/脱附循环稳定性。结果表明，无需成型和添加粘结剂，泡沫铜三维致密多孔结构在提高传热传质性能的同时对MIL-101起到良好的集成作用，且不影响复合吸附剂吸附性能；泡沫铜孔隙率为95%，悬浮液中MIL-101与水质量比为3:1时，制备的MIL-101/泡沫铜涂层中MIL-101质量分数为38%，体积分数可达91%；在25 ℃下时MIL-101/泡沫铜涂层热导率为0.73 W/(m·K)，为MIL-101原粉的12倍，显著提升了热导率；MIL-101/泡沫铜涂层对水进行10次吸附/脱附循环后，吸附量保持不变，具有良好的水热稳定性。

关键词：吸附制冷 MIL-101 泡沫铜 孔隙率 热导率

Research on preparation and thermal conductivity performance of MIL-101/ foam copper composite adsorbent

Abstract

Adsorption cooling working pair of MIL-101 with clean refrigerant such as water has the advantages of large specific surface area, high adsorption capacity, and low regeneration temperature, but it has a low bulk density and poor thermal conductivity. Therefore, strengthening thermal conductivity of MIL-101 is one of the key technologies to improve the adsorption refrigeration efficiency. In this paper, copper foam was selected as a metal carrier, MIL-101 is prepared by hydrothermal synthesis method, and MIL-101/copper foam coating was prepared by dip coating method. Effects of mass ratio of MIL-101/water in the coating suspension and the porosity of copper foam on the performance of MIL-101/copper foam coating were investigated. The thermal conductivity of the composites was tested by a Hot-disk thermal-constant analyzer and adsorption/desorption stability of MIL-101/foamed copper coatings on water was investigated. Results show that, without forming and adding binder, the complex three-dimensional dense porous structure of the foam metal plays a good role in the integration of MIL-101 while improving the heat and mass transfer performance of the material, and the composite does not affect the adsorption performance of the adsorbent. When the porosity of foam copper is 95% and the mass ratio between MIL-101 and water is 1:3, the mass fraction of MIL-101 in MIL-101/ foam copper coating is 38%, and the volume fraction is 91%. The thermal conductivity of MIL-101/copper foam coating prepared is 0.73 W/(m·K), which is 12 times than that of MIL-101 at 25 ℃. Adsorption/desorption cycle stability of water on MIL-101/foam copper coating for 10 times, adsorption uptake of water remains stable, and it has good hydrothermal stability.

Keywords: Adsorption refrigeration; MIL-101; Foam copper; Porosity; Thermal conductivity

目 录

摘 要 I

Abstract II

第1章 概 述 1

1.1 吸附制冷原理 1

1.2 吸附制冷工质对 2

1.2.1 传统吸附制冷工质对 2

1.2.2 新型吸附制冷工质对 3

1.3 吸附剂导热强化 3

1.3.1 金属粉末 3

1.3.2 复合吸附剂 3

1.3.3 涂层换热器 4

1.3.4 泡沫金属材料 4

1.4 本文主要研究内容 5

第2章 实 验 7

2.1 主要原料和试剂 7

2.2 主要仪器及设备 7

2.3 MIL-101合成与纯化 7

2.4 MIL-101/泡沫铜涂层制备 8

2.4.1 载体预处理 8

2.4.2涂层悬浮液配置 8

2.4.3 浸涂法制备MIL-101/泡沫铜涂层 8

2.4.4 静态水吸附实验 8

2.5 MIL-101/泡沫铜涂层热导率测定 9

2.6 MIL-101/泡沫铜涂层表征 9

2.6.1 XRD分析物相 9

2.6.2 SEM分析形貌 9

第3章 结果与讨论 11

3.1 浸涂法制备MIL-101/泡沫铜涂层工艺 11

3.1.1 MIL-101/水质量比 11

3.1.2 泡沫铜孔隙率 12

3.2 MIL-101/泡沫铜涂层结构表征 13

3.2.1 XRD分析物相 13

3.2.2 SEM分析形貌 14

3.3 MIL-101/泡沫铜涂层热导率测定 14

3.4 MIL-101/泡沫铜涂层吸水稳定性 16

第四章 结论与展望 17

4.1 结论 17

4.2 展望 17

参考文献 19

致 谢 22

第1章 概 述

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