A special flame retardant fire extinguishing agent for coal mines

Abstract

The invention discloses a flame-retarding fire extinguishing agent for coal mines, which is prepared from distilled water, 0.5 to 5 percent of propylene glycol, 67.5 to 76 percent of high-hydroscopicity resin, 5 to 9 percent of potassium ferricyanide, 6 to 11 percent of tripolycyanamide and 8 to 12 percent of potassium bicarbonate, wherein the pH value of the flame-retarding fire extinguishing agent is regulated to 6 to 8.5 by oxalic acid or acetic acid. After vacuum dehydration, the flame-retarding fire extinguishing agent for coal mines, which is in form of water absorbing gel, is obtained.The flame-retarding fire extinguishing agent is used by mixing with water according to a ratio of 1:(1,000-10,000). The gel like product formed by water absorbing gel containing the high-hydroscopicity resin and absorbed water has high water retaining performance under a high-temperature condition and has a very high heat capacity. The flame-retarding fire extinguishing agent can form a stable gel layer on the surface of an object so as to insulate a fire source from the air, prevent fire from spreading and consequently extinguish the fire. Compared with common water, the flame-retarding fireextinguishing agent has a lower flowing rate and a high viscosity; and the flame-retarding fire extinguishing agent not only can reduce the temperature of the surface of coal and but also can permeate into the inside of the coal to cool the coal and to prevent the coal from burning again, so that the fire extinguishing effect is enhanced.

Description

technical field [0001] The invention relates to a special flame retardant and fire extinguishing agent for coal mines, in particular to the fire prevention and fire extinguishing of coal in coal mines. Background technique [0002] Coal is the main energy source in my country. The natural conditions of my country's coal mines are poor and the geological conditions are complex. The mainland of my country is formed by the convergence of many small plots in multiple episodes. The main coal fields have undergone multi-stage, multi-directional, and intensive transformations, resulting in The geological conditions of coalfields are complicated, and there are many associated disasters, among which, mines with coal seams that have the risk of spontaneous combustion account for half of them. Therefore, preventing coal seams is naturally a very important safety issue. [0003] Common fire extinguishing agents are water, foam, haloalkane, carbon dioxide, etc. Halon, carbon dioxide, i...

AI Technical Summary

Problems solved by technology

Halon, carbon dioxide, inert gas and other gas fire extinguishing agents are expensive, and it is difficult to exert their fire extinguishing efficiency in open spaces; dry powder fire extinguishing agents have higher fire extinguishing efficiency and fast fire extinguishing speed. However, the cooling effect on the combustion is small when the dry powder is extinguished. It basically does not have the function of covering and preventing combustion and evaporation. The surface of the coal pile is easy to cause re-ignition, and the interior of the coal pile basically does not play a role. The foam fire extinguishing agent has high fire extinguishing efficiency and fast fire extinguishing speed when applied to combustible liquid fires. However, it is low in efficiency, large in consumption and uneconomical for extinguishing coal spontaneous combustion fires;

[0004] In terms of safety technology for coal mine fire prevention and control, there is a fire prevention and extinguishing method of grouting and water injection, but this method has the problems of easy leakage of grouting water, large equipment investment and low sealing efficiency; Fire extinguishing method, but this method has the disadvantages of difficult operation and high cost