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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.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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