Energy Storage Science and Technology ›› 2024, Vol. 13 ›› Issue (8): 2615-2622.doi: 10.19799/j.cnki.2095-4239.2024.0068

• Energy Storage Materials and Devices • Previous Articles     Next Articles

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

Jie LUO(), Zhigao SUN(), Juan LI, Cuimin LI, Haifeng HUANG   

  1. School of Environment Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, China
  • Received:2024-01-23 Revised:2024-02-13 Online:2024-08-28 Published:2024-08-15
  • Contact: Zhigao SUN E-mail:1249980249@qq.com;szg.yzu@163.com

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: