Coupled inert gas fire prevention and extinguishing technology in coal mine

Abstract

The invention belongs to the field of safety equipment for coal mine production and particularly relates to a coupled inert gas fire prevention and extinguishing technology in a coal mine. The technology includes the following steps of: (1) calculating coupled inert gas injection flow by using the formula Qn=60KeQ0 (C1-C2) / (Cn+C2-1); (2) burying pipes in a goaf; (3) connecting a low temperature stainless steel hose of a liquid carbon dioxide tanker (15) to a carbon dioxide vaporizer (14); (4) delivering nitrogen to an inert gas coupler (11); (5) coupling gaseous carbon dioxide and nitrogen inthe inert gas coupler (11) to be then continuously transported to a working face the goaf (8) to prevent and extinguish fire; (6) detecting gas in the goaf (8). The coupled inert gas fire preventionand extinguishing technology in the coal mine has the advantages that due to the fact that when the specific gravity of the coupled inert gas is increased to a greater proportion than that of the air,flow in the goaf is slow and not easy to be carried away by air leakage in the goaf; injecting appropriate amount under the control of a carbon dioxide sensor does not endanger the health of workers;when the oxygen concentration in the goaf is reduced below 7%, spontaneous combustion does not occur.

Description

technical field [0001] The invention belongs to the field of coal mine production safety equipment, and in particular relates to an underground coal mine coupled inert gas fire prevention and extinguishing technology. Background technique [0002] Gobs are formed after underground mining in coal mines. There are many floating coals in the goafs. These floating coals have a tendency to spontaneously ignite. After air leakage in the gobs, the floating coals begin to oxidize. After reaching their natural ignition period, the floating coals will spontaneously ignite. Affect the safety of coal mine underground, for this reason, prevent floating coal from spontaneously igniting, is the important safety technology of coal mine underground. At present, most coal mines use nitrogen injection to the goaf to reduce oxygen fire prevention, and have achieved a certain fire prevention effect. However, there are certain defects in the nitrogen fire prevention technology, mainly because the...

AI Technical Summary

Problems solved by technology

At present, most coal mines use nitrogen injection to the goaf to reduce oxygen fire prevention, and have achieved a certain fire prevention effect. However, there are certain defects in the nitrogen fire prevention technology, mainly because the specific gravity of nitrogen is slightly lighter than that of air. During nitrogen injection, the loss in the goaf is serious, especially in the following situations: ① When the vertical height of the goaf from the surface is lower than 200m, the air leakage from the surface fissures is serious, resulting in serious air leakage in the goaf, and nitrogen Easy to leak from the goaf

②Gassy working face has a large air distribution volume, serious air leakage in the goaf, and nitrogen is easy to leak from the goaf

③ The air inlet and air return sides of the goaf in the working face with a large mining height are not well ventilated, the air leakage is particularly serious, and nitrogen is also easy to leak

However, simply injecting carbon dioxide into the goaf also has great defects: ① Carbon dioxide is a poisonous gas, and the "Coal Mine Safety Regulations" stipulates that the concentration of carbon dioxide in the upper corner should not exceed 1.5%, so injecting less carbon dioxide into the goaf is not a big deal Oxygen-reducing and fire-proofing effect, too much injection will cause the carbon dioxide on the working face to exceed the limit

②The fluidity of carbon dioxide in the goaf is poor, so it cannot flow from the air inlet side of the goaf to the return air side, and cannot completely cover the oxidation zone of the goaf, so most of the floating coal in the goaf is still easy to oxidize and spontaneously ignite

③Continuous large-scale injection of carbon dioxide cannot be achieved in terms of equipment and technology

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