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

Abstract

A method for preparing a retardant slurry containing coal ash for controlling the fire disaster in a coal field comprises the steps of adding coal ash, aluminium phosphate, magnesium chloride, sodium carboxymethylcellulose, sodium silicate and sodium bentonite material in water to prepare a coal ash thickening slurry having high retardation and high-temperature resistance. The prepared thickening slurry is conveyed to burning coal seams or coal fractures through a grouting pipeline by a high-pressure screw pump. After a period of time, the retardant slurry can be thickened and solidified into a soft solid form. The retardant slurry can resist a high temperature of above 1000°C, form a hard block structure after water evaporates, and hermetically cover the coal body and block the fractures. The retardant slurry containing coal ash is low in costs, safe and environmentally friendly, and has significant control effects on the fire disaster caused by spontaneous combustion of coal in the coal field, and 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.