Abstract
Water has unsurpassed capabilities in fire extinguishing. However, water scarcity is rapidly increasing in many regions and water shortage problems have led to find either new water resources or improve seawater treatment technologies. In this study, a new environment-friendly and high-efficiency powdered fire extinguishing agent with a core-shell structure is designed. The designed extinguishing agent is a colloidal powder with a 92% liquid content and is prepared through physical modification and high-speed shearing. Fumed silica is used for the external shell due to its chemical inertness, whereas seawater is used as the core due to its high extinguishing efficiency. Results show that the size of the prepared agent ranged between 100–200μm. The two fire extinguishing experiments of different scales demonstrate that the employing inorganic salts with seawater as the core can significantly increase the efficiency of the new powder in extinguishing gasoline and diesel fire compared with ultrafine and common ABC dry powders. The suppression mechanism of action is caused by the combined flame chemical and pyrolysis theories of the potassium compounds. This study would be of great theoretical significance and application value for improving the application scope of the seawater.
Highlights
IntroductionEspecially gasoline and diesel oil, are widely used in various applications in daily life[1]
Petroleum and petroleum products, especially gasoline and diesel oil, are widely used in various applications in daily life[1]
If the flame and tank wall temperature is 1050–1400 °C and > 1000 °C, respectively, during the oil tank fire disaster, increased water will be needed to cool down the tank wall due to thermal radiation
Summary
Especially gasoline and diesel oil, are widely used in various applications in daily life[1]. Han[9] studied a dry water extinguishing agent that employed hydrophobic SiO2 for the shell and phosphoric acid solution as the core and found that the acid solution can exist as a stable core. He improved the traditional spraying device; significantly saving extinguishing agents from spraying loss. A powder extinguishing agent with a gel core-shell structure was prepared using SiO2 for the shell and seawater as the core through high-speed shearing method This extinguishing agent was added with Gellan gum and methyl hydrogen silicone oil to increase its structural strength. The extinguishing mechanism was discussed based on theory and experimental results
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