Experimental research on the concentration characteristics of R32 and R161′ combustion product HF

Fluorine-containing refrigerants will still play an irreplaceable role in the process of research and development of new refrigerants. So it is critical to study the main toxic combustion product HF. This paper contributed to concentration characteristics of HF about R32 and R161 on particular concentrations when combustion reaction occurred. Firstly, a new enclosed test method of concentration of HF (CHF) was presented through comparative analysis different existent methods and results. Then based on the original experimental system independently designed and built, actual CHF of 16.9%/16.89% R32 and 4.17%-4.74% R161 were measured respectively under the conditions of normal temperature and humidity. Moreover, an equation was obtained to estimate the relationship between the actual CHF and concentration of R161 (CR161), when CR161 was in the range of lower flammability limit (LFL) and stoichiometric concentration (Cst). And the possible affected factors of the actual CHF were analyzed. Finally it should be given sufficient attention that the risk of high CHF still exists. Therefore, the results will be of universal guiding significance for the security application of fluorine-containing refrigerants in this paper.