R290制冷剂惰化燃爆特性实验研究

发布时间：2018-08-20 16:14

【摘要】：为了研究R290制冷剂惰化燃爆特性,采用带搅拌功能和氧浓度在线测定的20L球试验装置,对R290制冷剂进行了极限氧浓度测定。实验测定了丙烷在CO_2和N_2惰化气氛中的爆炸极限及极限空气浓度LAC,确定丙烷的极限氧浓度LOC;采用三元图爆炸区、丙烷-O_2二维图爆炸区和ASTM标准分布图分析了混合气体爆炸区边界的燃爆特征,给出了极限氧浓度的确定方法和边界爆炸压力分布规律。实验结果表明:常温常压下R290的爆炸极限为2.1%~9.6%,CO_2惰化气氛中的极限氧浓度为13.3%,对应的丙烷浓度为3.3%;N2惰化气氛中的极限氧浓度为10.8%,对应的丙烷浓度为2.7%。通过对比分析不同CO_2和N_2浓度下的爆炸区分布特征,表明CO2对丙烷的惰化效果要优于N2,以氮气和二氧化氮体积分数比为1∶2测试惰化气氛保护能力,惰化效果介于同浓度单种惰性气体之间。
[Abstract]:In order to study the ignition and explosion characteristics of R290 refrigerant, the limit oxygen concentration of R290 refrigerant was determined by a 20L ball test device with stirring function and oxygen concentration on-line measurement. The explosion limit and the limit air concentration of propane in CO_2 and N _ 2 inerting atmospheres have been determined experimentally, and the limit oxygen concentration of propane has been determined. In this paper, the explosion characteristics of the boundary of the mixed gas explosion zone are analyzed, and the determination method of the limit oxygen concentration and the distribution law of the boundary explosion pressure are given. The experimental results show that the explosion limit of R290 is 2.1and 9.6and the limit oxygen concentration in the inerting atmosphere is 13.3and the corresponding concentration of propane is 3.3and the limit oxygen concentration in N2 inerting atmosphere is 10.8 and the corresponding propane concentration is 2.7. By comparing and analyzing the distribution characteristics of explosion zone at different concentrations of CO_2 and N-\ -2, it is shown that the inerting effect of CO2 on propane is better than that of N2, and the inerting atmosphere protection ability is tested at 1:2 with the ratio of nitrogen and nitrogen dioxide at 1:2. The inerting effect is between a single inert gas of the same concentration.
【作者单位】：公安部天津消防研究所;天津理工大学环境科学与安全工程学院;
【基金】：公安部科技强警基础工作专项(2016GABJC35);公安部消防局应用创新项目(2016XFCXO7)
【分类号】：X932

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