Inhibiting gel for harnessing coal seam fire hazard

Abstract

The invention relates to an inhibition gel for controlling seam fire, which is a new inhibition gel made by adding gel additive, cross-linking agent and reinforcing agent into the water and is characterized in high water-absorbing, high water-preservation and high inhibition performance. The inhibition gel is sprayed equally onto the seam or the fractures of coal body that needs flame retardant or that is burning through a transmission pipeline. The inhibition gel takes on a liquid form with certain viscosity in the pipeline, while takes on a solid form after being covered on the seam or permeating into the fractures of coal body for a certain period of time. The inhibition gel has strong water-absorbing performance, and the maximum can reach more than 2000 times; the inhibition gel has good water-preservation performance, which can preserve water for more than 6 months; when the water is evaporated gradually, the gel will not have cracking phenomenon. The inhibition gel is characterized in few material dosage, low cost, safety and environment protection, and significant effect of controlling seam fire, so the inhibition gel has good application prospect.

Description

technical field [0001] The invention relates to a method for controlling coal seam fires in mines, in particular to a method for preparing an inhibitory gel for controlling coal seam fires. Background technique [0002] Coal seam spontaneous combustion fire is one of the main natural disasters in coal mining in my country. In recent years, the fully-mechanized top coal caving technology has been vigorously promoted and applied, which has greatly improved the production efficiency of coal mines. However, this coal mining method has a large caving height, a large amount of residual coal left in the goaf, and serious air leakage, which makes coal seams frequently occur in mines. . my country's Xinjiang, Ningxia, Inner Mongolia and other provinces still have large-scale coalfield fires, which burn 10-13.6 million tons of coal every year, and the economic loss exceeds 20 billion yuan. Spontaneous combustion of coal produces a large amount of SO 2 、H 2 S, CO and CO 2 gas, ser...

AI Technical Summary

Problems solved by technology

[0003] For the control of coal seam fires in mines, techniques such as grouting and spraying inhibitors are routinely used, but the water slurry is prone to separation, and the slurry only flows along the low terrain in the goaf, and cannot cover the coal body evenly and cannot go to high places. Accumulation, easy to form "ditch" phenomenon; inhibitors corrode underground equipment and endanger workers' physical and mental health, and the fire prevention effect is not very ideal

In order to make water consolidate together, coal mines began to use gel to control coal seam fires in the 1990s, but there are big problems in the use of the current gel, ammonium salt gel will decompose at room temperature to produce ammonia The gas seriously pollutes the underground environment. The cost of polymer gel is high (more than 180 yuan per cubic meter), the dosage is large, and the water absorption capacity is not strong. Once the water evaporates, the gel is easy to crack, which leads to air leakage and easy Spontaneous combustion of coal seams