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Core-shell structured fire extinguishing agent for metal sodium fire and preparation method thereof

A core-shell structure and fire-extinguishing technology, which is applied in fire prevention equipment and other directions, can solve the problems of incomplete fire-extinguishing, easy re-ignition of sodium fire, weak suffocation, etc., and achieve the effects of improving fire-extinguishing efficiency, good fluidity and environmental friendliness.

Inactive Publication Date: 2018-11-16
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite is used as a fire extinguishing agent, and its main principle is to use the good thermal conductivity of graphite to lower the temperature of sodium, but it must be covered with a certain thickness of graphite powder when extinguishing a fire, otherwise air will pass through the loosely covered graphite powder, making the suffocation not good. Strong enough to cause incomplete fire extinguishing, easy to re-ignite sodium fire

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 4.0 g (2.0%) of hydroxymelamine dissolved in 100 ml of water to form a solution, then weigh 146.0 g (73%) of expanded graphite (expansion factor is 300), and mix the two in a stirrer at a speed of 3000 revolutions per minute Stir for 5 minutes, then add 50.0g (25%) of sodium stearate, continue stirring for 3 minutes at a speed of 3000 revolutions per minute in the mixer, take it out and dry it under vacuum at 120°C for 2 hours to obtain off-white powder Sodium metal fire extinguishing agent with core-shell structure.

[0022] Put 150 g of the fire extinguishing agent prepared in this example into a 1000 ml dry powder fire extinguisher tank, pressurize to 0.2 MPa, the distance between the nozzle and the center of the oil pan is 0.5 m, and the nozzle aperture is 10 mm. In a circular oil pan with a diameter of 40cm, add 100g of metallic sodium, heat until it melts and burns completely, then remove the heating device; aim the dry powder nozzle at the metallic sodium f...

Embodiment 2

[0024] Weigh 16.0 g (8.0%) of hydroxymethyl cellulose and dissolve it in 100 ml of water to form a solution, then weigh 122.0 g (61.0%) of expanded graphite (expansion factor is 200), and the two are mixed in a stirrer at 2000 rpm Stir at a speed of 5 minutes, then add 62.0g (31.0%) of magnesium stearate, continue to stir in the mixer at a speed of 2000 rpm for 3 minutes, take it out and dry it in vacuum at 105°C for 4 hours to obtain off-white Sodium metal fire extinguishing agent with powdery core-shell structure.

[0025] Put 150g of metal sodium fire extinguishing agent dry powder into a 1000ml dry powder fire extinguisher tank, pressurize to 0.2MPa, the nozzle is 0.5m away from the center of the oil pan, and the nozzle aperture is 10mm. In a circular oil pan with a diameter of 40cm, add 100g of metallic sodium, heat until it melts and burns completely, then remove the heating device; aim the dry powder nozzle at the metallic sodium fire to spray, stop spraying powder when...

Embodiment 3

[0027] Weigh 2.0g (1.0%) of phenolic resin and dissolve it in 100ml of water to form a solution, then weigh 160.0g (80%) of expanded graphite (expansion factor is 300), and stir the two in a stirrer at a speed of 3000 rpm After 5 minutes, add 38.0g (19%) talc powder and continue to stir for 2 minutes at a speed of 3000 rpm in the mixer. After taking it out, vacuum-dry it at 120°C for 2 hours to obtain off-white powder with a core-shell structure. Sodium metal fire extinguishing agent.

[0028] Put 150g of sodium metal fire extinguishing agent dry powder into a 1000ml dry powder fire extinguisher tank, pressurize to 0.2MPa, the distance between the nozzle and the center of the oil pan is 0.5m, and the nozzle aperture is 10mm. In a circular oil pan with a diameter of 40cm, add 100g of metallic sodium, heat until it melts and burns completely, then remove the heating device; aim the dry powder nozzle at the metallic sodium fire to spray, stop spraying powder when the open flame i...

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PUM

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Abstract

The invention discloses a core-shell structured fire extinguishing agent for a metal sodium fire and a preparation method thereof. The fire extinguishing agent is composed of the following componentsby mass: 60.0 to 85.0% of expanded graphite, 1.0 to 8.0% of a binder and 15.0 to 35.0% of a covering agent. According to the invention, powder particles of the fire extinguishing agent prepared by using the preparation method provided by the invention are sprayed onto the metal sodium fire; the expanded graphite has good heat conduction effect, so the temperature of metal sodium can be rapidly reduced; meanwhile, the covering agent can form a compact and thin film on the surface of burning metal sodium, so the burning metal sodium is isolated from surrounding air, and the effect of extinguishing fire by smothering is exerted. Thus, the fire extinguishing agent provided by the invention has greatly-improved fire extinguishing efficiency compared with a single graphite powder, and can achieve the effect of rapid and thorough fire extinguishing.

Description

technical field [0001] The invention relates to the fire fighting field of hazardous chemicals, in particular to a core-shell structure fire extinguishing agent for metal sodium fire and a preparation method thereof. Background technique [0002] Sodium metal is a common chemical, widely used in halide reduction of zirconium, niobium and tantalum, sodium lamp electric light source, alloy manufacturing, nuclear reactor coolant and heat exchanger and other fields. Metal sodium has a strong reducing property, and it is easy to burn when it is heated in the air or reacts with water, so it has a high risk of fire. In addition, because metallic sodium will undergo a strong chemical reaction when it meets water, metallic sodium fires cannot be extinguished with water-based fire extinguishing agents. [0003] At present, the commonly used metal sodium fire extinguishing agents mainly include sodium chloride dry powder, sodium carbonate dry powder, expanded graphite powder and liqui...

Claims

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Application Information

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IPC IPC(8): A62D1/00
CPCA62D1/0014A62D1/0064
Inventor 倪小敏邓志华王浩波
Owner UNIV OF SCI & TECH OF CHINA
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