Abstract:

At present, the international community demand for environmentally friendly working fluids is more and more big, but their use is limited due to their flammability. This study experimentally tested the inhibition effect of R227ea on the flammability of environmentally friendly working fluid R290. It was found that as the proportion of R227ea increased, the lower flammability limit of the mixture gradually increased, and the upper flammability limit first increased and then decreased. The critical inhibitory ratio of R227ea on the flammability of R290 was 3.35. Considering the strong greenhouse effect of R227ea, this study proposed to add environmentally friendly R1216 to R227ea to form a new hybrid flame retardant, thereby achieving“complementary advantages”in their performance. The new mixed flame retardant has a large unit volume cooling capacity compared to R227ea, higher cooling coefficient and thermal conductivity compared to R1216, and lower viscosity. By comparing the performance of ternary mixed refrigerant R290/R227ea/R1216 with pure refrigerant R290, it was found that when the composition ratio of R290/R227ea/R1216 is 21%/6%/73%, its coefficient of performance and unit volume cooling capacity were 103.8% and 94.2% of pure R290, respectively, and its environmental friendliness and flammability meet the requirements. The research results have reference significance for the safe application of R290 and the study of new hybrid flame retardant.

Key words: refrigerant, R290, flame retardant, flammability, binary mixture, explosions, organic compounds

摘要：

目前国际社会对环保工质的需求越来越大，但由于环保工质往往具有一定的可燃性，其使用受到限制。实验测试了R227ea对环保工质R290可燃性的抑制效果，发现随着R227ea比例的增加，混合物的可燃下限逐渐上升，可燃上限先上升后下降，R227ea对R290可燃性的临界抑制比为3.35。提出在R227ea中加入R1216组成新型混合阻燃剂，以达到性能“优势互补”的目的。混合阻燃剂相比R227ea具有更大的单位容积制冷量，相比R1216具有更高的制冷系数和热导率，更低的黏度。比较三元混合工质R290/R227ea/R1216与纯工质R290的性能发现，当R290/R227ea/R1216的比例为21%/6%/73%时，其制冷系数和单位容积制冷量分别为R290的103.8%和94.2%，并且环保性和可燃性满足要求。研究结果对环保工质R290的安全应用及新型混合阻燃剂的研究具有参考意义。

关键词: 制冷剂, R290, 阻燃剂, 可燃性, 二元混合物, 爆炸, 有机化合物