Old goaf coal bed gas ground extraction oxygen-consuming microorganism fire preventing and extinguishing system and method

Abstract

The invention discloses an old goaf coal bed gas ground extraction oxygen-consuming microorganism fire preventing and extinguishing system and method. The old goaf coal bed gas ground extraction oxygen-consuming microorganism fire preventing and extinguishing system and method are characterized in that microorganisms with high oxygen consumption and strong viability are cultured through a microorganism culture device, then an extraction pipe, a nitrogen injection pipe, a liquid extraction pipe and a culture solution injection pipe are put down through a multi-branch well, the microorganisms and nitrogen mixed air prepared by a nitrogen making device are injected into old goaf through the nitrogen injection pipe, a microorganism culture solution is injected into the old goaf through the culture solution injection pipeline, after 120 hours and after the oxygen content in the to-be-detected old goaf reaches 10% or below, mine well water and the microorganism culture solution are extracted through the liquid extraction pipe, and then coal bed gas is extracted through the extraction pipe; and in the extraction process, the content of index gas in the old goaf is monitored in real time through a sensor. According to the system, before the coal bed gas is extracted, the oxygen content in the old goaf is rapidly consumed through the high-oxygen-consumption microorganisms, so that coal oxidation spontaneous combustion or gas explosion accidents in the coal bed gas extraction process are effectively prevented, and therefore safe extraction of coal bed gas resources in the old goaf is achieved.

Description

technical field [0001] The invention relates to a system and a method for preventing and extinguishing a fire by oxygen-consuming microorganisms in ground drainage of coalbed methane in an old empty area, and belongs to the technical field of fire prevention and extinguishing. Background technique [0002] Due to long-term high-intensity mining, there are a large number of old empty areas in our country. As a relatively strong greenhouse gas, gas is extremely destructive. The greenhouse effect caused by gas gas is about 25 to 72 times that of carbon dioxide. Gas in old empty areas can diffuse into the atmosphere through poorly sealed wellheads or even surface cracks, thereby accelerating global warming, leading to species extinction and large-scale ecological environment. Changes and other global issues are becoming more and more serious. At the same time, gas is also a clean and high-quality energy and chemical raw material. As a clean energy, it can "turn waste into trea...

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Problems solved by technology

Furthermore, the establishment of a microbial fire prevention system and method under the ground drainage conditions of the old goaf was proposed, which solved the problems of coal spontaneous combustion, gas explosion and other accidents that were easily caused in some mines during the coalbed methane extraction process of the old goaf

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