内酯型槐糖脂促进HCFC-141b水合物生成

Promotion of HCFC-141b hydrate production by lactone sophorolipids

蓄冷空调是降低电网峰谷差、实现电网负载侧调峰的一种重要手段,制冷剂水合物作为蓄冷介质具有蓄冷密度大和相变温度高的优点。HCFC-141b制冷剂是一种潜在的蓄冷物质,为了促进HCFC-141b制冷剂水合物的生成,实验研究了绿色环保表面活性剂槐糖脂对HCFC-141b水合物生成的影响。研究结果表明,添加适量的内酯型槐糖脂可大幅度缩短HCFC-141b水合物形成的诱导时间。槐糖脂的添加量影响水合物的成核和生长过程,质量分数为0.5%是内酯型槐糖脂的最佳浓度,促进HCFC-141b水合物生成的平均诱导时间最短,约为153min。实验结果还表明水合物的生成具有随机性,添加内酯型槐糖脂可以改善水合物生成的随机性,0.5%(质量分数)的内酯型槐糖脂的诱导时间标准方差最小,水合物成核稳定性最好。内酯型槐糖脂的添加也影响HCFC-141b水合物的蓄冷量,当添加0.5%(质量分数)的内酯型槐糖脂时,HCFC-141b水合物的平均蓄冷量达到232.45kJ/kg。

Cold storage air conditioning is an important method to reduce peak-valley difference of power grid and realize peak regulation of the load side of power grid.Refrigerant hydrate as a cold storage medium has the advantages of high cold storage density and high phase change temperature.HCFC-141b refrigerant is a potential cold storage medium.In order to promote the formation of HCFC-141b refrigerant hydrate,the green environmental sophorid glycolipid was selected as a promoter to improve HCFC-141b hydrate formation.The experimental results showed that the addition of lactone sophorolipids could greatly shorten the induction time of HCFC-141b hydrate formation.The mass fraction of sophora sophorolipid affects the nucleation and growth process of hydrate.0.5%was the optimal concentration of lactone sophorolipid to improve hydrate formation,where the average induction time of HCFC-141b hydrate formation was the shortest(about 153min).Experimental results also showed that hydrate formation is random.The addition of lactone sophorolipids could reduce the randomness of hydrate production.The standard deviation of induction time of hydrate formation with 0.5%lactone sophorolipids was smallest in this work,which showed the system with 0.5%lactone sophorolipids could steadily nucleate.The addition of lactone sophorolipids would affect the cold storage capacity of HCFC-141b hydrate.When 0.5%lactone sophorolipids were added,the average cold storage capacity of HCFC-141b hydrate reached 232.45kJ/kg.