石蜡对无机复合相变储热体系的改性研究

杨效田; 沈梁玉; 王彩龙; 杨强斌; 刘敏

doi:10.13801/j.cnki.fhclxb.20210609.005

石蜡对无机复合相变储热体系的改性研究

doi: 10.13801/j.cnki.fhclxb.20210609.005

1.
兰州理工大学　材料科学与工程学院，省部共建有色金属先进加工与再利用国家重点实验室，兰州 730050
2.
重庆文理学院　化学与环境工程学院，环境材料与修复技术重庆市重点实验室，重庆 402160
3.
河北农业大学　海洋学院，秦皇岛 066000

基金项目: 甘肃省科技重点项目(1102GKDA049)；重庆市教育委员会科学技术研究项目(KJQN202001317)

详细信息

通讯作者:
杨效田，博士，副研究员，硕士生导师，研究方向为表面工程及能源材料　 E-mail：398830990@qq.com

中图分类号: TB321
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出版历程
- 收稿日期: 2021-04-23
- 修回日期: 2021-05-23
- 录用日期: 2021-06-02
- 网络出版日期: 2021-06-09
- 刊出日期: 2022-03-23

Study on paraffin modifying inorganic composite phase change heat storage system

1.
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, College of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2.
Chongqing Key Laboratory of Environmental Materials & Remediation Technologis, College of Chemistry and and Environmental Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, China
3.
Ocean college, Hebei Agricultural University, Qinhuangdao 066000, China

摘要

摘要: 水合盐相变储热材料普遍存在的过冷和相分离现象是影响其热稳定性和热性能的关键问题。以中低温水合盐相变储热材料MgCl₂∙6H₂O(MCH)和MgSO₄∙7H₂O(MSH)为研究对象，以活性炭(ACC)为添加剂，采用熔融共混法制备了MCH-MSH-ACC混合体系，并以石蜡(PA)为调节剂，制备了MCH-MSH-ACC/PA复合材料相变体系。研究了PA对复合相变体系的相变焓、相变温度、过冷度及相分离的影响。结果表明：微量PA的添加有助于提升MSH-MCH-ACC/PA体系的相变储热性能，和其他PA含量体系相比较，PA含量为0.5wt%的体系在储热阶段所需时间最短，而放热阶段持续时间最长，其初始相变焓值可达到321.75 kJ/kg，循环试验后相变焓稳定在310.25 kJ/kg。所制备的新型共混MSH-MCH-3wt%ACC/0.5wt%PA复合相变体系具有良好的储热性能和循环稳定性能。
- 复合材料 /
- 储热性能 /
- 过冷度 /
- 热循环稳定性 /
- 石蜡
Abstract: The supercooling and phase separation of hydrated salt phase change heat storage materials are two key issues which affect its thermal stability and thermal performance. MgCl₂∙6H₂O (MCH) and MgSO₄∙7H₂O (MSH) are used as the research materials, which are the phase change heat storage materials at moderate and low tempera-tures, and activated carbon (ACC) is used as the additive, The MCH-MSH-ACC composite phase change system was prepared by the melt blending method, then, the MCH-MSH-ACC/PA composite phase change system is prepared with paraffin (PA) as the modifier. The effects of PA on the phase change enthalpy, phase change temperature, subcooling degree and phase separation phenomenon of the composite phase change materials were studied. The re-sults show that the addition of trace PA is beneficial to improve the phase change heat storage performance of the MSH-MCH-ACC/PA system. Compared with other PA content systems, the system with 0.5wt% PA perform the shortest time in the heat storage stage and the maximum heat release time in the exothermic phase, whose initial phase change enthalpy value reach 321.75 kJ/kg, and the stable enthalpy is 310.25 kJ/kg after the cycle tests. The prepared new blend MSH-MCH-3wt%ACC/0.5wt%PA composite material has good heat storage property and good thermal cycle stability.
- composite material /
- heat storage property /
- subcooling degree /
- thermal cycle stability /
- paraffin

HTML全文

图 1 MgCl₂∙6H₂O (MCH)-MgSO₄∙7H₂O (MSH)-活性炭(ACC)/石蜡(PA)复合材料制备过程

Figure 1. Preparation of MgCl₂∙6H₂O (MCH)-MgSO₄∙7H₂O (MSH)-activated carbon (ACC)/paraffin (PA) composites

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图 2 不同ACC浓度下MCH-MSH-ACC体系的过冷度曲线

Figure 2. Subcooling curve of the MCH-MSH-ACC system under different ACC concentrations

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图 3 3wt%和4wt%ACC浓度的MCH-MSH-ACC复合材料降温曲线

Figure 3. Cooling curves of 3wt% and 4wt% ACC concentrations MCH-MSH-ACC composite materials

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图 4 不同PA含量的复合材料热循环前和循环后的DSC曲线

Figure 4. DSC curves of composite materials with different PA contents before and after thermal cycle

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图 5 MCH-MSH-ACC/PA复合相变材料随热循环的质量损失曲线(T为测试值；F为拟合值)

Figure 5. Mass change curves of MCH-MSH-ACC/PA composite PCM materials with thermal cycle (T—test value; F—fitting value)

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图 6 不同石蜡含量复合材料的温度变化曲线

Figure 6. Temperature change curve of composite materials with different paraffin content

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图 7 PA含量为0.5wt%的复合相变材料的热稳定测试曲线

Figure 7. Thermal stability test curve of composite phase change material with 0.5wt%PA

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图 8 不同PA含量复合相变材料循环试验后的表面形貌

Figure 8. Surface morphology of composite phase change materials with different paraffin content after cyclic test

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图 9 含0.5wt%PA复合相变材料元素分布

Figure 9. Elemental distribution of composite phase change material with 0.5wt%PA

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图 10 不同PA含量的复合材料10次循环后的XRD图谱

Figure 10. XRD patterns of composites with different PA contents after 10 cycles

1—MgCl₂·6H₂O; 2—MgCl₂·H₂O; 3—MgSO₄·7H₂O; 4—Mg₂Cl(OH)₃·4H₂O; 5—Mg₃Cl(OH)₅·4H₂O; 6—Mg₃(OH)₅Cl·3H₂O; 7—Mg₁₀Cl₂(OH)₁₈·5H₂O; 8—PA

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表 1 不同ACC浓度下MCH-MSH-ACC系统的过冷度数值

Table 1. Subcooling value of the MCH-MSH-ACC system under different ACC concentrations

Sample	Undercooling/℃
MCH-MSH	6.63
MCH-MSH-1wt%ACC	4.74
MCH-MSH-2wt%ACC	1.12
MCH-MSH-3wt%ACC	0
MCH-MSH-4wt%ACC	0

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表 2 不同PA含量的MCH-MSH-ACC/PA复合材料的相变特性

Table 2. Phase change properties of MCH-MSH-ACC/PA composite PCMs with different PA contents

Condition	Sample	Onset temperature T_m/℃	Peak temperature T_p/℃	End temperature T_e/℃
Before cycle	MCH-MSH-ACC	88.87	97.82	115.98
	MCH-MSH-ACC/0.5wt%PA	82.16	91.78	111.96
	MCH-MSH-ACC/1.0wt%PA	85.30	93.29	115.31
	MCH-MSH-ACC/1.5wt%PA	93.11	100.69	117.33
	MCH-MSH-ACC/2.0wt%PA	92.07	101.03	119.82
After cycle	MCH-MSH-ACC	98.46	109.77	117.14
	MCH-MSH-ACC/0.5wt%PA	83.62	93.15	111.70
	MCH-MSH-ACC/1.0wt%PA	96.12	105.17	115.21
	MCH-MSH-ACC/1.5wt%PA	98.83	107.17	114.30
	MCH-MSH-ACC/2.0wt%PA	101.36	108.01	115.11

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