Complex foam extinguishing agent for coal mine

Abstract

The invention discloses a complex foam extinguishing agent for a coal mine and belongs to the technical field of fire prevention and extinguishing. The extinguishing agent is prepared from the following raw materials: main materials are 40 to 60 percent aqueous solution of ammonium bicarbonate or sodium bicarbonate and concentrated sulfuric acid in a solute mass ratio of 2:1-3:1, and auxiliary materials are a stabilizer and a foamer, wherein the auxiliary materials are 0.1 to 2 percent of the total weight of the main materials. Through a test, the extinguishing agent has the foaming coefficient of 20-200 and the foam stabilizing time of more than or equal to 2.5 hours. According to the foam extinguishing agent, the foam of inert gas carbon dioxide is applied to fire prevention and extinguishing of the coal mine, and the foam is diffused in a fire area and fills a fire space, so that the oxygen concentration in the fire area is rapidly reduced, fire is extinguished due to oxygen deficiency in the fire area, temperature is reduced and a fire extinguishing effect is good. The technology also can be applied to coal bed transformation, CO2 foam is easily absorbed by coal to displace partial methane, the recovery ratio of coal seam gas is improved, and CO2 is acid to reduce the generation of secondary precipitates, so that a gas drainage effect is improved. The complex foam extinguishing agent is simple and feasible, and low in cost.

Description

technical field [0001] The invention relates to a foam fire extinguishing agent, in particular to a high-efficiency and stable bubble two-phase composite foam fire extinguishing agent used for coal mine fire prevention and extinguishing. Background technique [0002] At present, a large number of inert gas fire prevention and extinguishing methods are used in coal mines. The commonly used inert gas fire prevention and extinguishing agents at home and abroad include nitrogen and carbon dioxide. by CO 2 The generator (group) reacts two chemical raw materials to generate CO 2 , through the pipeline to the underground goaf or tunneling face perfusion, with CO 2 Enrich and seal the fire area, and play the role of heat absorption, cooling, suffocation and fire extinguishing. The advantage of this scheme is that no electricity is used during use, the concentration of gas produced is high, and the temperature of gas produced is low, which is conducive to heat absorption and cooli...

AI Technical Summary

Problems solved by technology

At present, the existing technology of using carbon dioxide fire prevention and extinguishing in coal mines is mainly carbon dioxide gas. If the gas is replaced by inert foam, it can achieve the dual purposes of suffocation, flame retardant and cooling to prevent fire extinguishing. Therefore, the fire extinguishing effect is not as good as that of carbon dioxide foam. The effect has a significant impact. Although the existing data have proposed an index to improve the stability of carbon dioxide foam, it is mainly used in oil fracturing technology, and there is no method to improve the stability of carbon dioxide foam and increase the foam ratio of carbon dioxide.