爆炸极限实验系统研制及二甲醚/HFC125的可燃性研究  

Flammability Limits Measurement System and Flammability of Dimethyl Ether/HFC125

作　　者：张可[1] 吴江涛[1] 高辉[1] 薛征欣 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《西安交通大学学报》2010年第7期28-32,共5页Journal of Xi'an Jiaotong University

基　　金：国家"863计划"资助项目(2009AA05Z107);优秀博士论文基金资助项目(200540)

摘　　要：根据ASTME681-04及ANSI/ASHRAE Standard 34-2007标准,建立了一套全自动可燃性气体爆炸极限实验系统.该系统实际配气比例与设定比例的误差不超过±0.1%,配气比例的不确定度小于0.5%.对几种常见制冷剂的爆炸极限进行了测试,验证了系统的准确性.对二甲醚/HFC125混合气体的爆炸极限进行了实验研究,结果表明,加入HFC125后二甲醚的可燃性范围减小,当HFC125与二甲醚的体积比为4.6时达到临界抑爆点,但HFC125含量较低时对二甲醚的阻燃作用不明显.该测试结果为将二甲醚作为一种环保型制冷剂进行推广应用提供了安全参考.A fully automated system for testing the flammability limits of vapor and gases was established according to ASTM E681-04 and ANSI/ASHRAE Standard 34-2007. The measurement system consists of a vacuum unit,a mixing chamber,a humidity control,a combustion chamber and the control software. The deviation between the Absolute ratio by volume and the setting value is less than ±0.1%,and the uncertainty of the mixed ratio is below 0.5%. The reliability of the system was verified by comparing experimental data of several common refrigerants. The flammability limits of dimethyl ether/HFC125 mixtures were determined. The results show that the flammability range of the mixture decreases with the increase of HFC125,and there is a critical explosion suppression point at a volume ratio of 4.6（HFC125）：1. However,the inert effect of HFC125 with lower content is not obvious. The test result is of great value for the application of dimethyl ether as a green refrigerant.

关 键 词：爆炸极限 二甲醚 HFC125 

分 类 号：TB663[一般工业技术—制冷工程] O643.2[理学—物理化学]