A water- based aerosol fire extinguishing agent (WAE) is a safe and practical alternative to halons. It comprises an oxidizer, a fuel and a catalyst. The WAE combusts and generates large amounts of inert gases and vapor, which are released into the fire scenario, extinguishing the fire. KNO3 is used as an oxidizer to adjust the combustion rate and to ensure highly effective fire extinguishing ability and safe application of WAE. Generally, the combustion rate of WAE increases with an increase of KNO3%. However, within a specific range of KNO3%, the combustion rate decreases initially and then increases with an increase of KNO3%, called the 'N' effect in this study. The competition between these two effects leads to a decrease of the activation energy of the thermal decomposition of WAE as KNO3% increases along with an inhibiting effect of the liquid mixture that is generated during the combustion of the WAE. In addition, the relationship between the combustion rate and the fire extinguishing time is also discussed in this study.

C3H2F3Br(1323) is a new kind of Halon replacements developed by our research group. In order to improve the disperse capability of 1323, nitrogen was mixed with 1323 to form the binary fire- extinguishing agent. In this work, the binary fire- extinguishing agent of nitrogen and 1323 was used in experiment and the fire extinguishing efficiency was discussed. In addition, the fire suppression mechanism was investigated and the fire- extinguishing concentration of nitrogen and 1323 was also studied.

During the crowd evacuation process in the confined space, the stranded crowd in the egress is the main risk carrier for the stampede- trampling accident. The number of stranded crowd not only has directly relationship with the evacuation time, but also has some certain connection with the occurrence probability of the stampede- trampling accident. In this paper, the egress stranded crowd amount discrete model which follows the time is set up to estimate the number of stranded crowd in the egress or the aisle in the building at different times and to calculate the number of stranded crowd at the same time in the different width egress. Besides that, the case of stadium stand egress was chosen to prove the validity of this model.

The use of water mist to extinguish fire is a problem of particular interest since the banning of halogen- based agents for environmental reasons. This interest is reflected in the large number of research performed on the main mechanisms of extinguishment: heat extraction, oxygen displacement and attenuation of heat fluxes. In contrast, there are still little known about the chemical and some other aspects of water mist addition on the pool fire. In this paper, a phenomenological study is conducted of the effect of water mist addition on the kerosene pool fire through the measurement of the heat release rate, CO, CO2 and O2 species concentration in combustion with cone calorimeter apparatus. The experimental results show that there is a significant enhancement effect at beginning stage of water mist addition. And then, the flame size was decreased abruptly. By physical suppression effect combined with chemical effect, the experiments' results are explained especially. The study of effects of water- mist on pool fire will be useful for optimizing designation of water- mist fire- suppression system, improving the fire suppression efficiency and extending their application field.

C3H2F3Br(1323) is a new kind of Halon replacements that developed by State Key Laboratory of Fire Science in University of Science and Technology of China. In order to improve the disperse capability of 1323, nitrogen was mixed with it to form the binary fire- extinguishing agent. The extinguishing concentration of the nitrogen and 1323 binary mixtures was estimated based on adiabatic flame temperature calculations and the dependence of the rate of fire suppression of chemical agents on temperature. Besides that, cup burner experiments were conducted for the concentrations of binary fire extinguishing agent composed of 1323 and nitrogen In addition, the synergistic of nitrogen and 1323 in fire suppression was also discussed.