Effect of surfactant SG-10 on HCFC-141b hydrate formation and cold storage under static conditions

doi:10.19799/j.cnki.2095-4239.2024.0068

Abstract

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

CLC Number:

TB 34

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.

Figures/Tables 12

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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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