Effectiveness evaluation of fine water mist venturi nozzle systems with composite additives in improving fire suppression in polyurethane fires.

An experimental platform for fine water mist inhibition of polyurethane fire was set up to study the inhibition of polyurethane fire by a new type of spray nozzle fine water mist containing additives. The combustible material chosen for the experiment was polyurethane insulation foam board, a cold storage insulation material. Firstly, a venturi was installed in front of the nozzle, secondly, a surface tension meter was used to test the surface tension of the additives, and the pyrolysis products of the composite additives were analyzed by thermogravimetric analysis, and finally, the pressure was adjusted and a fine water mist with a concentration of 1% of the composite additives, and NaCl, CHSO4Na, KHCO3, and CO(NH2)2 were used to extinguish the polyurethane fire. The effectiveness of the fine water mist system in extinguishing fires at low concentrations of a single NaCl and green additive was investigated. The homemade additive package and the sodium chloride salt fine water mist system were compared. The experimental results showed that the synergistic effect of the physical and chemical additives significantly increased the suppression of polyurethane fires by fine water mist by about 16.7% relative to a single sodium chloride additive. [ABSTRACT FROM AUTHOR]