Tunnel Fire Suppression Tests with Water Mist Fire Extinguishing System Containing an Additive

Due to the advantages of no pollution, rapid fire suppression, less water consumption, lower cost, and little damage to the object, water mist fire extinguishing system has been widely used in road tunnels. In order to improve the fire extinguishing performance of water mist fire extinguishing system, a water based extinguishing agent was used as additive and injected into the water mist fire extinguishing system at the proportion of 3%. The tunnel fire suppression tests were carried out, and the fire extinguishing performance of water mist fire extinguishing system under different longitudinal ventilation velocity and with and without additive were compared and analyzed. The results show that high pressure water mist system has good cooling and heat radiation blocking effect, and has good fire control and extinguishing effect for tunnel oil fire;the suitable additive can effectively improve the fire control and extinguishing effect of water mist extinguishing system used in road tunnel.