静态条件下表面活性剂SG-10对HCFC-141b水合物生成和蓄冷的促进

doi:10.19799/j.cnki.2095-4239.2024.0068

摘要/Abstract

摘要：

制冷剂水合物蓄冷是降低电网峰谷差、提高空调经济性的一种新型蓄冷技术。水合物蓄冷相变潜热大，相变温度适宜，有效克服了传统蓄冷介质的缺点。但制冷剂水合物的形成存在诱导时间长和随机性大等问题。为了促进HCFC-141b制冷剂水合物的生成，改善水合物蓄冷能力，选择聚氧乙烯型非离子表面活性剂硬脂酸聚氧乙烯酯(SG-10)作为添加剂，研究其对HCFC-141b水合物生成和蓄冷量的影响。SG-10可有效促进水合物生成，添加量是影响其促进效果的重要因素。实验研究4种不同质量浓度的SG-10对水合物生成的影响，当质量浓度为2%时水合物形成稳定性好，生长密实，是该体系最佳添加量，此时水合物形成诱导时间最短(209 min)，蓄冷量最大(约为212.8 kJ/kg)，水合物生长速率最快[4.09 kJ/(kg·min)]。当表面活性剂SG-10浓度达到一定值时，其会自发缔合生成胶束，为水合物提供成核位点，有助于水合物生成。SG-10在溶液中形成的胶束是促进水合物形成的主要原因。

关键词: 水合物, 诱导时间, 蓄冷量, HCFC-141b, 生长速率

Abstract:

A refrigerant hydrate cold storage is a new type of cold storage technology that reduces the peak valley difference in the power grid and improves the economic efficiency of air conditioning. A hydrate cold storage has a large latent heat of phase change and an appropriate phase change temperature, which can effectively overcome the shortcomings of traditional cold storage media. However, refrigerant hydrates have certain disadvantages such as long induction time and randomness. To promote the formation of the HCFC-141b refrigerant hydrate and improve the hydrate cold storage capacity, acid ether, nonionic surfactant polyoxyethylene stearate (SG-10), is selected as an additive to investigate its effect on HCFC-141b hydrate formation and the cold storage capacity. SG-10 can effectively promote hydrate formation, and the amount added determines its promotion effect. Experimental studies were conducted on the effects of four different mass concentrations of SG-10 on hydrate formation. Within this concentration range, SG-10 can further promote the dispersion of HCFC-141b in water, increase the contact area between the reactants, and accelerate hydrate formation. When the concentration is 2%, the stability of hydrate formation is good and the amount of hydrate formation increases and grows densely, making it the optimal addition amount for this system. Furthermore, the induction time for hydrate formation is the shortest (209 min), the cold storage capacity is the largest (approximately 212.7 kJ/kg), and the hydrate growth rate is the fastest [4.09 kJ/(kg·min)]. When the mass fraction of surfactant SG-10 increases to a certain value, it spontaneously associates to form micelles, which provide nucleation sites for hydrate formation. Introducing SG-10 in a solution to form micelle is an effective way of promoting hydrate formation.

Key words: hydrates, induction time, cold storage capacity, HCFC-141b, growth rate

中图分类号:

TB 34

罗洁, 孙志高, 李娟, 李翠敏, 黄海峰. 静态条件下表面活性剂SG-10对HCFC-141b水合物生成和蓄冷的促进[J]. 储能科学与技术, 2024, 13(8): 2615-2622.

Jie LUO, Zhigao SUN, Juan LI, Cuimin LI, Haifeng HUANG. Effect of surfactant SG-10 on HCFC-141b hydrate formation and cold storage under static conditions[J]. Energy Storage Science and Technology, 2024, 13(8): 2615-2622.

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SG-10质量分数	诱导时间/min	平均诱导时间/min	诱导时间标准差	生长时间/min	平均生长时间/min
0.5%	585, 312, 308, 354, 842	480	232	48, 57, 52, 49, 30	47
1.0%	142, 352, 335, 394, 530	351	139	60, 39, 40, 46, 53	48
2.0%	159, 170, 190, 234, 292	209	55	61, 47, 48, 51, 55	52
3.0%	362, 215, 184, 542, 620	385	193	46, 52, 39, 53, 18	42

SG-10质量浓度	0.5%	1%	2%	3%
No.1	106.9	173.1	215.6	168.6
No.2	117.9	169.1	215.9	174.1
No.3	115.1	163.2	206.8	166.5
平均蓄冷量/(kJ/kg)	113.3	168.5	212.8	169.7

符号	含义及单位	符号	含义及单位
△H_i	蓄冷量，kJ/kg	T_f	热平衡温度，℃
c_h	温水比热容，kJ/(kg·℃)	m_h	温水质量，kg
c_i	水合物比热容，kJ/(kg·℃)	m_i	水合物质量，kg
c_k	HCFC-141b比热容，kJ/(kg·℃)	m_j	水合物分解后水的质量，kg
c_b	玻璃试管比热容，kJ/(kg·℃)	m_k	HCFC-141b质量，kg
c_j	水合物分解后水的比热容，kJ/(kg·℃)	m_b	玻璃试管质量，kg
T_h	温水初始温度，℃	V	水合物平均生成速率，kJ/(kg·min)
T_b	水合物初始温度，℃	Δt	水合物从生成开始到结束的时间，min
T_e	水合物相变温度，℃

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