Mining constant-pressure liquid carbon dioxide fire preventing and extinguishing device and method

Abstract

The invention discloses a mining constant-pressure liquid carbon dioxide fire preventing and extinguishing device and method. The mining constant-pressure liquid carbon dioxide fire preventing and extinguishing device comprises a low-temperature liquid storage tank, wherein the low-temperature liquid storage tank communicates with gas inlet and return pipelines and valves, liquid inlet and return pipeline valves, an overflow pipe and a valve, gas inlet and return pipelines on the gas inlet and return pipeline valves are provided with pressure gauges and safety valves, the low-temperature liquid storage tank communicates with a pressurizing gas pipe and a pressurizing liquid pipe, the pressurizing liquid pipe communicates with a stainless steel heat exchange pipe arranged on an oil bath box, and an exhaust port of the stainless steel heat exchange pipe is connected through the pressurizing air pipe. The liquid carbon dioxide fire extinguishing efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of coal mine fire prevention and extinguishing, and in particular relates to a mine-used constant-pressure liquid carbon dioxide fire prevention device and method. Background technique [0002] In recent years, with the mining of deep and medium-thick coal seams, in order to greatly improve the production efficiency of coal mines, the fully mechanized top-coal caving technology has been promoted and applied. Due to the limitation of top-coal caving technology, there are disadvantages such as large caving height in the goaf, large amount of coal residue, and serious air leakage, which lead to frequent coal spontaneous combustion accidents. At present, it has become one of the main factors restricting the development of the coal industry, and it is also a major issue in coal mines. One of the hidden dangers of production safety. Over the years, the development of coal fire disaster prevention methods has main...

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Problems solved by technology

[0003] (1) When the existing storage tank releases liquid carbon dioxide, the internal pressure will continue to decrease. When the pressure is less than 0.9MPa, the liquid carbon dioxide will solidify, resulting in blocked pipelines and unable to continue to work;

[0004] (2) When the pressure is too low, an external vaporizer is usually used to vaporize liquid carbon dioxide and release it to the hidden danger area. The fire extinguishing effect of vaporized carbon dioxide is much lower than that of liquid carbon dioxide, and the external vaporizer is bulky and inconvenient to install;

[0005] (2) The pressure change in the tank is unstable, which can easily lead to pulsed liquid discharge and affect the stability of the infusion state;

[0006] (3) There is no monitoring device inside the tank, so it is impossible to accurately judge the release of liquid carbon dioxide;

[0007] (4) There is no safety protection alarm device in the tank. If carbon dioxide leaks, it will affect the safety of human life.

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