Abstract: In order to study the high temperature problem of aerosol fire extinguishing agent in the process of practical application, the method of comparative test was used. By adding cooling material KHCO3 to the aerosol fire extinguishing agent, and adding heat insulation material, the test was carried out on the nozzle temperature. The results showed that the combustion temperature of aerosol fire extinguishing agent decreases obviously when the addition of KHCO3 is 2%. The light magnesium carbonate selected in the experiment has good cooling effect and short fire extinguishing time. When the thickness of pearl rock wool is 20 cm, the effect is the best, and the highest temperature of the nozzle is 63 ℃. It provides theoretical reference and technical support for reducing the nozzle temperature of aerosol fire extinguishing agent.

Key words: fire protection, aerosol fire extinguishing agent, combustion temperature, nozzle temperature