Cooling type dry powder fire extinguishing agent and preparation method and application thereof
The present invention discloses a cooling type dry powder fire extinguishing agent and a preparation method and application thereof, which belongs to the technical field of fire control. Through a static mixing technology, an aqueous solution and a solid hydrophobic material are dispersed and mixed efficiently to form a cooling type dry powder fire extinguishing agent. The fire extinguishing agent is a micron solid particle of the aqueous solution wrapped by the hydrophobic material microscopically, and is in a dry powder state macroscopically, which can significantly reduce the electrical conductivity of the fire extinguishing agent. Meanwhile, a field rapid preparation method is adopted, which can realize real-time preparation. The preparation method is simple and efficient. The technology can be used for fighting a battery fire, has significant cooling and anti-reignition effects and can avoid the problem of electrical conduction of a traditional water-based fire extinguishing agent.
1. A preparation method of a cooling type dry powder fire extinguishing agent, comprising: taking compressed gas as a power source, pre-mixing an aqueous solution and a solid hydrophobic material at first by a premixer in proportion, then dispersing and mixing by a static mixer, and finally forming a cooling type dry powder fire extinguishing agent;
wherein a mass ratio of the aqueous solution and the solid hydrophobic material is 1:1 to 60:1;
the specific surface area of the solid hydrophobic material is 100-400 m2/g;
the premixer is one of a supersonic jet mixer and a Venturi jet mixer;
the static mixer is one or a combination of more of an SV type static mixer, an SK type static mixer, an SX type static mixer, an SZ type static mixer, an SY type static mixer, an SH type static mixer, an SL type static mixer and an SD type static mixer.
2. The preparation method of the cooling type dry powder fire extinguishing agent according to claim 1 , wherein the aqueous solution is one component or a complex of more components of pure water, ammonium dihydrogen phosphate aqueous solution, ammonium polyphosphate aqueous solution, aqueous urea solution, sodium dihydrogen phosphate aqueous solution, potassium bicarbonate aqueous solution, sodium bicarbonate aqueous solution, sodium carbonate aqueous solution, potassium carbonate aqueous solution, sodium chloride aqueous solution, potassium chloride aqueous solution, ammonium bromide aqueous solution, ammonium sulfate aqueous solution, ammonium bisulfate aqueous solution, ammonium aluminum sulfate aqueous solution, sodium borate aqueous solution, potassium ferricyanide aqueous solution, lanthanum nitrate aqueous solution, lanthanum sulfate aqueous solution, lanthanum carbonate aqueous solution, lanthanum phosphate aqueous solution, cerium nitrate aqueous solution, cerium sulfate aqueous solution, cerium carbonate aqueous solution, cerium phosphate aqueous solution, yttrium nitrate aqueous solution, yttrium sulfate aqueous solution, yttrium carbonate aqueous solution and yttrium phosphate aqueous solution.
3. The preparation method of the cooling type dry powder fire extinguishing agent according to claim 1 , wherein the solid hydrophobic material is one component or a complex of more components of fluorocarbon powder, hydrophobic silica powder, hydrophobic ceramic powder, hydrophobic metal oxide powder and hydrophobic insoluble salt powder.
4. The preparation method of the cooling type dry powder fire extinguishing agent according to claim 1 , wherein the content of a liquid water solution not wrapped by the solid hydrophobic material in the cooling type dry powder fire extinguishing agent is not higher than 10%.