A method for preventing and extinguishing fire and reducing oxygen content in flue gas by injecting flue gas from a power plant downhole

Abstract

The invention discloses a method for preventing fire and reducing oxygen content in exhaust gas through injecting exhaust gas of a power plant in a well. Coal can adsorb oxygen to reduce oxygen content in exhaust gas. Oxygen concentration reduction mainly utilizes 11 coal storage tanks to be cooperated for recycling; according to the normal pressure volumetric method, the coal quantity in one coalstorage tank is obtained through the comprehensively fed exhaust gas quantity, the oxygen content when the exhaust gas is fed and the oxygen content when the exhaust gas is discharged; the tanks carry out four procedures including exhaust gas feeding, oxygen removal, exhaust gas discharging and coal changing sequentially; 11 tanks take turns to carry out the four procedures and are alternately recycled to ensure that exhaust gas is continuously provided for a goaf; the coal storage tanks can conveniently carry out coal loading and unloading operation; as oxygen adsorption by coal does not change the coal nature, the loaded coal is new coal produced by a coal yard, and the unloaded coal can be transported to the power plant as fuel; and coal is adopted to adsorb oxygen to avoid spontaneouscombustion of coal; fire prevention of an underground goaf is carried out on a coal mine, and the coal resource is rich, so that the cost is greatly reduced.

Description

technical field [0001] The invention relates to the field of fire prevention and extinguishment in goafs of coal mines, in particular to a method for preventing and extinguishing fires by injecting flue gas from a power plant into underground wells to reduce the oxygen content in the flue gas. Background technique [0002] Coal is the main energy source in our country, and coal spontaneous combustion disasters seriously affect the healthy and stable development of the coal industry, especially the spontaneous combustion of coal left in goafs in coal mines. At present, it is urgent to innovate and develop low-cost and effective fire-fighting technologies and processes to prevent coal spontaneous combustion. [0003] Coal-fueled thermal power plants will produce a large amount of oxygen-containing flue gas, which is a good fire prevention material and can replace the existing nitrogen production fire prevention technology. The power plant flue gas is low-oxygen industrial was...

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Problems solved by technology

At present, the commonly used oxygen removal methods include iron scrap oxygen removal, carbon combustion oxygen removal, pressure swing adsorption oxygen removal, etc., but these methods have the disadvantages of high cost or the generation of other harmful substances.

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