低GWP含氟制冷剂燃烧产物HF浓度的实验研究

Experimental study on concentration of combustion product HF of fluorine-containing refrigerants with low GWP

对燃烧产物HF浓度的研究是安全应用低GWP(全球变暖潜能值)含氟制冷剂及其混合物的基础。以国际标准为基础参考方法,自主设计并搭建了封闭环境下反应、泄压、稀释和浓度测试连续系统,系统可满足安全测试要求。以R1234yf和R161为实验对象,测试结果表明,试验环境温度为27~30℃时,R1234yf的可燃极限范围为8.2%~11.5%;在温度为26~30.5℃时,在可燃极限范围内,随着R1234yf浓度的增加,燃烧产生的HF浓度先增加后减少,HF浓度危险峰值为18.3 ppm。当试验环境温度为27~28.5℃,R161在其浓度范围为4.16%~4.3%时,尽管燃烧产物HF的浓度均低于3 ppm,但是HF浓度仍随着R161的浓度的增加而增加。经过分析,燃烧产物HF的浓度可能与燃烧反应程度,实际反应过程机理和周围环境条件有关。

The concentration characteristic of combustion product'HF is the foundation to the safe application of fluorine-containing refrigerants with low GWP and their mixtures.According to two international standards as reference methods,a closed continuous system is independently designed and built.And the system can meet the requirements of the safety tests.R1234 yf and R161 are as the experiment objects in this paper.The testing results indicate that R1234 yf is observed to be flammable with the flammability limit range of 8.2%~11.5% under the temperature 28.5±1.5 ℃.In the range,the concentration of HF is first increase and then decrease with the increase of the concentration of R1234 yf,and its possible risk value of the peak concentration is 18.3ppm,when the testing temperature is in the range of 26~30.5 ℃.In addition,when R161 in the concentration range of 4.16% ~4.3%,the concentrations of combustion product HF are less than3 ppm,and the HF concentration increases with the increases of R161.The concentration characteristic of combustion product'HF may be related to the degree of the combustion reaction,the mechanism of the actual reaction process and the conditions of the surrounding environment after analysis.