Solid gel foam fire extinguishing agent, and preparation method and use thereof
View Patent ↗A solid gel foam fire extinguishing agent includes a material A and a material B; the material A includes the following components in mass percentage: 18% to 25% of an inorganic silicate, 0.25% of sodium carboxymethyl cellulose, 0.25% of sodium alginate, 0.1% to 0.5% of xanthan gum, 0.5% to 1% of polyvinyl alcohol, 0.5% to 1.5% of sodium lauryl sulfate, 0.01% to 0.05% of dodecanol, 0.005% to 0.01% of disodium ethylenediaminetetraacetate, and water as a balance; and the material B includes the following components in mass percentage: 25% of sodium dihydrogen phosphate, 25% of acetic acid, 1% to 1.5% of fatty alcohol polyoxyethylene ether, 0.1% to 0.5% of 3% aqueous film-forming foam, 0.01% to 0.05% of the dodecanol, and water as a balance. The fire extinguishing agent exhibits advantages including low density, low oil wettability, high resistance, high adhesiveness, and foam collapse-resistant properties in fire resistance.
1. A solid gel foam fire extinguishing agent, comprising a material A and a material B; wherein
the material A comprises the following components in mass percentage: 18% to 25% of an inorganic silicate, 0.25% of sodium carboxymethyl cellulose (CMC-Na), 0.25% of sodium alginate, 0.1% to 0.5% of xanthan gum, 0.5% to 1% of polyvinyl alcohol (PVA), 0.5% to 1.5% of sodium lauryl sulfate (SLS), 0.01% to 0.05% of dodecanol, 0.005% to 0.01% of disodium ethylenediaminetetraacetate (EDTA-2Na), and water as a balance; and
the material B comprises the following components in mass percentage: 25% of sodium dihydrogen phosphate, 25% of acetic acid, 1% to 1.5% of fatty alcohol polyoxyethylene ether, 0.1% to 0.5% of 3% aqueous film-forming foam (AFFF), 0.01% to 0.05% of the dodecanol, and water as a balance; and
wherein the volume fraction of material A to material B is 1.05≤A:B≤1.25 to form a AB mixed solution.
2. The solid gel foam fire extinguishing agent according to claim 1 , wherein the inorganic silicate is at least one selected from the group consisting of sodium silicate and potassium silicate.
3. The solid gel foam fire extinguishing agent according to claim 2 , wherein the inorganic silicate is the sodium silicate.
4. The solid gel foam fire extinguishing agent according to claim 1 , wherein a preparation process of the material A comprises the following steps: dissolving the inorganic silicate in the water under stirring, adding the CMC-Na, conducting stirring to achieve dispersion and dissolution, adding the sodium alginate, the xanthan gum, the PVA, the EDTA-2Na, and the dodecanol, and then adding the SLS to allow stirring for 60 min to 120 min until all the components of the material A are fully dissolved to form the material A.
5. The solid gel foam fire extinguishing agent according to claim 1 , wherein a preparation process of the material B comprises the following steps: pouring the sodium dihydrogen phosphate and the dodecanol into the water and stirring, adding the fatty alcohol polyoxyethylene ether, the acetic acid, and the 3% AFFF, and then continuously stirring for 30 min to 60 min until all the components of the material B are dissolved to form the material B.
6. A preparation method of the solid gel foam fire extinguishing agent according to claim 1 , comprising the following steps:
feeding the material A into a first branch pipe of a 3-to-1 pipe connector;
feeding the material B into a second branch pipe of the 3-to-1 pipe connector;
allowing the material A and the material B to converge from the first branch pipe and the second branch pipe into a header pipe of the 3-to-1 pipe connector at a volume fraction meeting 1.05≤A:B≤1.25 to form an AB mixed solution;
introducing air through a third branch pipe of the 3-to-1 pipe connector;
mixing the air with the AB mixed solution at a volume ratio of (5-10):1; and then
discharging a resulting liquid mixture to form a foamed gel.
7. The preparation method according to claim 6 , wherein a velocity of the AB mixed solution flowing in the header pipe, a header pipe diameter, and a distance from a converging point of the material A and the material B to an introducing point of the air satisfy Formula (1):
V
≥
μ
L
ρ
D
t
,
(
1
)
wherein, V represents the velocity of the AB mixed solution flowing in the header pipe, in m/s;
μ represents a liquid viscosity of the AB mixed solution, in Pa·s;
L represents the distance from the converging point of the material A and the material B to the introducing point of the air, in m;
μ represents a density of the AB mixed solution, in kg/m 3 ;
D represents the header pipe diameter, in m; and
t represents a gelation time of the AB mixed solution, in s.
8. A method of using a solid gel foam fire extinguishing agent in extinguishing an oil fire, wherein the solid gel foam fire extinguishing agent is the solid gel foam fire extinguishing agent according to claim 1 which is applied to the fire.
9. The method according to claim 8 , wherein the oil fire is a full surface fire in a large-scale oil storage tank.
10. A method of using a solid gel foam fire extinguishing agent in extinguishing an electrical fire, wherein the solid gel foam fire extinguishing agent is the solid gel foam fire extinguishing agent according to claim 1 which is applied to the fire.
11. The method according to claim 10 , wherein the electrical fire is a photovoltaic system fire.
12. A method of using a solid gel foam fire extinguishing agent in extinguishing an oil fire, wherein the solid gel foam fire extinguishing agent is a solid gel foam fire extinguishing agent prepared by the preparation method according to claim 6 which is applied to the fire.
13. A method of using a solid gel foam fire extinguishing agent in extinguishing an electrical fire, wherein the solid gel foam fire extinguishing agent is a solid gel foam fire extinguishing agent prepared by the preparation method according to claim 6 which is applied to the fire.