Abstract:

To explore more efficient fire extinguishing techniques for Chinese liquor warehouses, based on the similarity theory, an experimental bench for liquid CO₂ fire extinguishing with dimensions of 5 000 mm×2 400 mm×2 900 mm was constructed. An in-depth study was conducted on the changes in Chinese liquor quality, temperature distribution, and gas volume fraction during the process of extinguishing Chinese liquor pool fire using liquid CO₂ fire extinguishing systems with different combustion disk diameters. The research results indicate that liquid CO₂ can effectively extinguish Chinese liquor fires. The larger the diameter of the combustion disk, the more significant the change in mass. The larger the diameter of the combustion disk, the higher the temperature that can be reached by the Chinese liquor pool fire, up to 340 ℃. The extinguishing time under three different combustion disc diameters is 32, 36, and 38s respectively, and there is no re-ignition phenomenon. The highest gas volume fraction of CO₂ in the fire scene space can reach 26%. The distribution of CO₂ content at measurement points G₁-G₄ under different combustion disc diameters is as follows: G₄ > G₃ > G₂ > G₁. The distribution of CO content is: G₃ > G₄ > G₁ > G₂. The distribution of O₂ content is G₁ > G₂ > G₃ > G₄.

Key words: liquid CO₂ fire extinguishing, Chinese liquor pool fire, quality change quantity, temperature, gas concentration