微胶囊/脱硫石膏相变储能复合材料的制备与性能

刘凤利; 白建侠; 刘俊华; 李俏莉

微胶囊/脱硫石膏相变储能复合材料的制备与性能

1.
河南大学　循环与功能建材实验室, 开封 475004
2.
开封大学　土木建筑工程学院, 开封 475004

基金项目: 河南省科技攻关项目(212102310565)；河南省高等学校重点科研项目(21B560008)；固废资源化利用与节能建材国家重点实验室开放基金资助项目(SWR-2020-007)

详细信息

通讯作者:
刘凤利，博士，副教授，硕士生导师，研究方向为相变储能建筑材料、生态建筑材料、固废资源化利用　E-mail：lfl@henu.edu.cn

中图分类号: TU599;TB332
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- 文章访问数: 106
- HTML全文浏览量: 61
- 被引次数: 0
出版历程
- 收稿日期: 2023-10-24
- 修回日期: 2023-11-26
- 录用日期: 2023-12-01
- 网络出版日期: 2023-12-20

Preparation and properties of phase change energy storage composite with microcapsules and desulfurized gypsum

1.
Laboratory for Recycled and Functional Building Materials, Henan University, Kaifeng 475004, China
2.
School of Civil Engineering and Architecture, Kaifeng university, Kaifeng 475004, China

Funds: Scientific and Technological Breakthrough Foundation of Henan Province (212102310565); Key Scientific Research Projects of Universities in Henan Province (21B560008); State Key Laboratory of Solid Waste Resource Utilization and Energy Saving Building Materials (SWR-2020-007)

摘要

摘要: 以相变微胶囊(MPCM)为储能基元与脱硫石膏复合，研究了MPCM对脱硫石膏基复合材料力学性能、热性能和热循环稳定性的影响规律。结果表明：MPCM的潜热储能作用可调节料浆的水化温升，起到缓凝作用，同时赋予复合材料储能调温功效；然而掺入MPCM对复合材料强度不利。MPCM掺量为50wt%时复合材料综合性能较好。此时，相变温度24.51℃，相变焓28.47 J·g⁻¹，储热温峰和温峰出现时间较纯石膏分别降低和延迟了6.4℃、980 s，储热控温作用明显；导热系数0.451 W·(m·K)⁻¹；28天抗压强度25.05 MPa；250次冷热循环质量损失率、相变温度变化率和相变焓变化率分别为0.67%、0.08%和2.3%，热循环稳定性良好。该复合材料力学性能、热性能和热循环稳定性良好，在建筑储能围护体系中应用前景广阔。
- 相变微胶囊 /
- 建筑储能 /
- 力学性能 /
- 热性能 /
- 热循环稳定性
Abstract: Micro-encapsulated phase change materials (MPCM) was used as energy storage elements and combined with desulfurized gypsum. Effects of MPCM on the mechanical properties, thermal properties and thermal cycle stability of desulfurized gypsum-based composites were investigated. Results show that the latent heat energy storage capacity of MPCM can not only adjust the hydration temperature rise of the slurry, but also gave the composite the power to store energy and regulate temperature. However, the addition of MPCM has a negative effect on the strength of the composite. When the MPCM content is 50wt%, the comprehensive properties of the composite are better. At this time, the phase transition temperature and enthalpy of the composite are 24.51℃ and 28.47 J·g⁻¹, respectively. The temperature peak during heat storage stage and the time to reach the peak temperature are reduced and delayed by 6.4℃ and 980 s, when compared with pure gypsum. The effect of heat storage and temperature control is obvious. The thermal conductivity of the composite is 0.451 W·(m·K)⁻¹ and its 28-day compressive strength is 25.05 MPa. The mass loss rate, phase change temperature change rate and phase change enthalpy change rate of 250 cold hot cycles are 0.67%, 0.08% and 2.3%, respectively, and the thermal cycle stability is good. Phase change energy storage gypsum has good mechanical properties, thermal properties and thermal cycle stability, and has broad application prospects in building envelope structure.
- micro-encapsulated phase change materials (MPCM) /
- building energy storage /
- mechanical properties /
- thermal properties /
- thermal cycle stability

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图 1 癸酸-硬脂酸@二氧化硅(CA-SA@SiO₂)相变微胶囊的DSC曲线

Figure 1. DSC curve of Capric acid - stearate @ silica (CA-SA@SiO₂) phase change microcapsules

T_c—Peak cooling temperature; ΔH_c—Latent heat of cooling phase transition; T_m—Peak heating temperature; ΔH_m—Latent heat of heating phase transition

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图 2 SEM图像: (a) 相变微胶囊(MPCM)；((b), (c))相变储能石膏

Figure 2. SEM images: (a) Micro-encapsulated phase change materials (MPCM); ((b),(c)) Phase change energy storage gypsum

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图 3 相变储能石膏的28天抗压强度

Figure 3. The 28-day compressive strength of phase change energy storage gypsum

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图 4 不同MPCM掺量下相变储能石膏早期内部水化温升

Figure 4. Early hydration temperature rise of phase change energy storage gypsum under different MPCM dosages

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图 5 MPCM掺量50wt%、70wt%时浆体形态对比图

Figure 5. Comparison of slurry morphology at 50wt% and 70wt%MPCM dosage

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图 6 不同MPCM掺量相变储能石膏的导热系数

Figure 6. Thermal conductivity of phase change energy storage gypsum with different MPCM dosages

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图 7 不同MPCM掺量相变储能石膏的储/放热性能

Figure 7. Thermal storage/release performance of phase change energy storage gypsum with different MPCM dosages

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图 8 相变储能石膏不同冷热循环次数对应质量损失率

Figure 8. Mass loss rate of phase change energy storage gypsum under different cold-hot cycles

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图 9 冷热循环前后相变储能石膏的DSC曲线

Figure 9. DSC curves of phase change energy storage gypsum before and after cold-hot cycles

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图 10 冷热循环前后相变储能石膏的TG曲线

Figure 10. TG curve of phase change energy storage gypsum before and after cold-hot cycles

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表 1 粉煤灰的化学组成

Table 1. Chemical composition of fly ash wt%

SiO₂	Al₂O₃	CaO	SO₃	Fe₂O₃	MgO	TiO₂	Na₂O	MnO	K₂O
47.84	30.43	4.81	1.33	5.12	0.50	1.63	0.42	—	1.50

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表 2 改性脱硫石膏基体配比

Table 2. Mix ratio of modified phase desulfurized gypsum matrix wt%

Gypsum	Cement	FA	Quicklime	HPMC	SP	Retarder
69.98	15.32	9.17	5.53	0.15	0.05	0.28
Notes: The dosage of HPMC, SP and retarder is calculated according to the quality of powder material including gypsum, cement, FA and quicklime.

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表 3 改性脱硫石膏基体物理力学性能

Table 3. Physical and mechanical properties of modified phase desulfurized gypsum matrix

Apparent density/kg·m⁻³	Water absorption/%	Thermal conductivity/(W·(m·K)⁻¹)	Compressive strength/MPa
1 914	16.76	0.910	48.81

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表 4 冷热循环前后相变储能石膏的热物性

Table 4. Thermal properties of phase change energy storage gypsum before and after cold-hot cycles

Phase change energy storage gypsum with 50wt% MPCM	Melt		Solidify
Phase change energy storage gypsum with 50wt% MPCM	T_m/℃	H_m/(J·g⁻¹)	T_c/℃	H_c/(J·g⁻¹)
0 thermal cycle	24.51	28.47	25.10	27.38
250 thermal cycles	24.53	27.84	25.08	26.76
Notes: T_m—Peak heating temperature; H_m—Enthalpy of fusion; T_c—Peak cooling temperature; H_c—Solidification enthalpy.

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