Feng Biao, Yang Zhao, Lv Zijian, Zhai Rui, Chen Yubo, Zhao Wenzhong
Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, MOE, School of Mechanical Engineering, Tianjin University, Tianjin, 300350, PR China.
Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, MOE, School of Mechanical Engineering, Tianjin University, Tianjin, 300350, PR China.
J Hazard Mater. 2019 Apr 15;368:21-32. doi: 10.1016/j.jhazmat.2018.12.119. Epub 2019 Jan 2.
Refrigerants with low global warming potential (GWP), will play an important role in the research of alternative refrigerants and the development of new refrigerants, but most of them are flammable. And the actual environment of the refrigeration system varies with different factors, especially gas disturbance. In this paper, the combustion characteristics of four refrigerants, i.e., isobutane (R600a), ethylene (R1150), propane (R290), and 2,3,3,3-Tetrafluoroprop-1-ene (R1234yf) under the conventional static and the gas disturbance were studied. Firstly, the flame characteristics and lower flammability limits (LFLs) of the refrigerants were investigated. Then the special combustion phenomena were observed and analyzed in the presence of the gas disturbance, and an improved method for better defining the LFLs of the flammable gases under the disturbance was proposed. Finally, the experimental results show that the LFLs of the three natural refrigerants under specific low disturbance are lower than that in normal conditions, but except for R1234yf. It was found that the specific disturbance may enhance the combustion intensity by comparing the burning time of visible flame under the two conditions. The results have guiding significance for the safe application of flammable refrigerants.
全球变暖潜能值（GWP）较低的制冷剂将在替代制冷剂的研究和新型制冷剂的开发中发挥重要作用，但其中大多数具有可燃性。而且制冷系统的实际环境会因不同因素而变化，尤其是气体扰动。本文研究了异丁烷（R600a）、乙烯（R1150）、丙烷（R290）和2,3,3,3-四氟丙烯（R1234yf）这四种制冷剂在常规静态和气体扰动条件下的燃烧特性。首先，研究了制冷剂的火焰特性和下限燃烧极限（LFLs）。然后，在气体扰动存在的情况下观察并分析了特殊燃烧现象，并提出了一种改进方法，以便更好地确定扰动下可燃气体的LFLs。最后，实验结果表明，在特定低扰动下，三种天然制冷剂的LFLs低于正常条件下的LFLs，但R1234yf除外。通过比较两种条件下可见火焰的燃烧时间发现，特定扰动可能会增强燃烧强度。研究结果对可燃制冷剂的安全应用具有指导意义。
