Equipment and method for inhibiting early oxidation of residual coal in goaf

Abstract

The invention discloses equipment and a method for inhibiting early oxidation of residual coal in a goaf. A conveying pipeline is arranged in the goaf in advance, nozzles are arranged on the pipeline at intervals, and fusible alloy and temperature sensors are arranged at the nozzles. When residual coal oxidation occurs in the goaf, the temperature sensors detect that the space temperature rises, and coal oxidation is inhibited by reducing air leakage to the goaf; if the coal oxidation is continuous, the fusible alloy is molten due to the rising of the regional temperature, and the slurry is injected into a high-temperature region from the nozzles to treat early oxidation; and after grouting, real-time detection of treatment conditions is conducted by collecting and analyzing gas data. Compared with a traditional coal spontaneous combustion fire prevention and extinguishing technology, the coal spontaneous combustion fire prevention and extinguishing technology has the advantages that in the oxidation stage before coal spontaneous combustion, combustion caused by continuous oxidation of coal is restrained by controlling air leakage and subsequent fixed-point guniting, the high-temperature position can be accurately judged, and treatment can be conducted in time; and therefore, resource waste and environmental pollution caused by large-range spontaneous combustion of the residual coal are prevented.

Description

technical field [0001] The invention relates to equipment and a method for suppressing the early oxidation of residual coal in goafs, and belongs to the technical field of fire prevention and extinguishing in coal mines. Background technique [0002] Mine fire is one of the major natural disasters in coal mines, and coal spontaneous combustion is the main cause of mine fires. The development process of coal spontaneous combustion can usually be divided into three periods: the preparation period (i.e. temperature <70°C), at which time the groups in the coal contact with air to undergo a slow oxidation reaction; the self-heating period (i.e. temperature 70-350°C), During this period, the oxidation of coal is accelerated, producing a large amount of harmful gases; during the combustion period (ie, temperature > 350°C), the oxidation rate of coal rises sharply to generate a large amount of heat. However, because there is a large amount of residual coal in the goaf, it pro...

AI Technical Summary

Problems solved by technology

But at this time, the combustion process of residual coal has reached the second stage, and the coal body has undergone accelerated oxidation. The rapid temperature rise will easily cause large-scale spontaneous combustion, and the gas generated by spontaneous combustion can flow with the air, so although spontaneous combustion can be found, it cannot be detected. Accurately determine the location of the fire, and it is impossible to carry out precise control to suppress spontaneous combustion, resulting in the rapid self-heating of the remaining coal to the combustion period and the formation of a fire

When the coal body is treated during the self-heating and combustion stages, it not only increases the difficulty of treatment, but also causes waste of resources and environmental pollution

Images