Preparation method of pulverized fuel ash containing inhibition slurry for controlling fire in coal field

Abstract

A preparation method of pulverized fuel ash containing inhibition slurry for controlling fire in a coal field comprises the step of adding pulverized fuel ash, aluminium phosphate, magnesium chloride, sodium carboxymethylcellulose, sodium silicate and sodium bentonite material in water to prepare high-inhibition and high-temperature-resistance pulverized fuel ash thickening slurry. The prepared thickening slurry is conveyed to a burning coal seam or a coal fracture through a grouting pipeline by a high-pressure screw pump. After a period of time, the inhibition slurry can be thickened and solidified into a solid form. The inhibition slurry can resist high temperature of above 1,000 DEG C, can form a hard blocky structure after evaporation of water, and can closely cover the coal and block the fracture. The pulverized fuel ash containing inhibition slurry is low in cost, safe and environment-friendly, and remarkable in control effect on coal spontaneous combustion fire in the coal field, and has a good application prospect.

Description

technical field [0001] The invention relates to a coalfield fire control method, in particular to a preparation method for a fly ash-containing retarding slurry used for controlling coal spontaneous combustion fires in a coalfield. Background technique [0002] Coal is the main energy source in my country, accounting for about 70% of the primary energy production and consumption structure. From the perspective of spatial layout, my country's coal resources are mainly distributed in Northwest China and North China. Among them, Xinjiang, Inner Mongolia, Shanxi, Shaanxi, Ningxia and Gansu account for about 80% of the country's proven coal reserves, which are related to my country's energy resources. Strategic energy base for security and economic development. With the further westward movement of my country's coal industry, the strategic position of the above-mentioned areas has become increasingly prominent. However, due to long-term drought and little rain in these areas, th...

AI Technical Summary

Problems solved by technology

As water and soil are two kinds of fire extinguishing materials that are easy to obtain and low in cost, water injection and grouting are the most economical fire extinguishing methods; Uniform and effective coverage requires a large number of drilling holes and construction of many fish scale pits for a large amount of long-term water injection to achieve gradual cooling of the coal body; due to the lack of flow channels for water slurry, according to statistics, more than 80% of the water cannot absorb heat and cool down In the process of water injection and grouting, when the water gathers at the high temperature fire source, it will easily lead to the explosion of water gas, causing casualties; at the same time, when there is coal mine production under the coal fire, the grouting is also prone to slurry accidents. Threats to safety production in underground coal mines

Therefore, the traditional method of water injection and grouting cannot fully meet the needs of coal fire control.