Abstract: Under the background of carbon neutrality and carbon peak, it is urgent to screen environment-friendly gas fire extinguishing agents. There is still a lack of effective critical fire suppression concentration prediction model for low-carbon chain halogenated hydrocarbon gases. In this study, experiment and theoretical analysis are combined, and relevant parameters are selected based on dimensional analysis. Based on the molecular physicochemical properties and molecular structures of 16 typical fluorine-containing gases, this study used a dimensional analysis method to construct a critical fire suppression concentration prediction model. The comparative analysis with the experimental data of new low-carbon chain halogenated hydrocarbons shows that the model can be effectively used to predict the critical fire suppression concentration, which provides a certain theoretical basis and important technical support for the rapid screening and research and development of new halogenated hydrocarbons.

Key words: gas fire extinguishing agent, halogenated hydrocarbon, fire suppression concentration, dimensionless analysis, cup burner