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Temperature-sensitive phase-change gel material for inhibiting spontaneous combustion of coal as well as preparation method and application of temperature-sensitive phase-change gel material

A technology for spontaneous combustion of gel materials and coal, applied in heat exchange materials, chemical instruments and methods, fire prevention equipment, etc. Features, stable performance

Active Publication Date: 2021-07-27
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to control coal spontaneous combustion, technologies such as grouting, nitrogen injection, spraying inhibitors, colloidal material injection, and foam injection are usually used to prevent coal spontaneous combustion in mines. The effect is not ideal

Method used

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  • Temperature-sensitive phase-change gel material for inhibiting spontaneous combustion of coal as well as preparation method and application of temperature-sensitive phase-change gel material
  • Temperature-sensitive phase-change gel material for inhibiting spontaneous combustion of coal as well as preparation method and application of temperature-sensitive phase-change gel material
  • Temperature-sensitive phase-change gel material for inhibiting spontaneous combustion of coal as well as preparation method and application of temperature-sensitive phase-change gel material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A temperature-sensitive phase-change gel material for inhibiting coal spontaneous combustion, comprising the following components by mass percentage: water-absorbing monomer polyethylene glycol 3%, methyl cellulose 1.2%, carboxymethyl cellulose sodium 0.25% , 0.9% of magnesium hydroxide, 0.5% of bentonite suspension and 1% of kaolin suspension, and the balance is 40-50°C water, and then the temperature-sensitive phase-change gel material is prepared by blending weak cross-linking.

[0030] The specific steps are:

[0031] At room temperature, add bentonite to water and stir evenly to make a suspension with a concentration of 15wt%; add kaolin to water and stir evenly to make a suspension with a concentration of 15wt%; Sodium carboxymethyl cellulose and magnesium hydroxide were mixed uniformly to obtain a mixture A; the temperature was added to the mixture A and stirred with water at 40°C to obtain a solution A, and stirred until there were no particles; to the solution ...

Embodiment 2

[0034] A temperature-sensitive phase-change gel material for inhibiting coal spontaneous combustion, comprising the following components by mass percentage: water-absorbing monomer polyethylene glycol 3%, methyl cellulose 1.2%, carboxymethyl cellulose sodium 0.25% , 0.9% of magnesium hydroxide, 0.5% of bentonite suspension and 1% of kaolin suspension, and the balance is 40-50°C water, and then the temperature-sensitive phase-change gel material is prepared by blending weak cross-linking.

[0035] The specific steps are:

[0036] At room temperature, add bentonite to water and stir evenly to make a suspension with a concentration of 20wt%; add kaolin to water and stir evenly to make a suspension with a concentration of 20wt%; Mix plain, sodium carboxymethyl cellulose, and magnesium hydroxide uniformly to obtain mixture A; add water at a temperature of 40°C to mixture A and stir uniformly to obtain solution A, and stir until there are no particles; add bentonite suspension and ...

Embodiment 3

[0039] A temperature-sensitive phase-change gel material for inhibiting coal spontaneous combustion, comprising the following components by mass percentage: 4% water-absorbing monomer polyethylene glycol, 1.2% methylcellulose, and 0.25% sodium carboxymethylcellulose , 0.9% magnesium hydroxide, 1% bentonite suspension and 2% kaolin suspension, and the balance is 40-50°C water, and then the temperature-sensitive phase-change gel material is prepared by blending weak cross-linking.

[0040] The specific steps are:

[0041] At room temperature, add bentonite to water and stir evenly to make a suspension with a concentration of 20wt%; add kaolin to water and stir evenly to make a suspension with a concentration of 20wt%; Sodium carboxymethyl cellulose and magnesium hydroxide were mixed uniformly to obtain a mixture A; the temperature was added to the mixture A and stirred with water at 40°C to obtain a solution A, and stirred until there were no particles; to the solution A, the be...

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Abstract

The invention discloses a temperature-sensitive phase-change gel material for inhibiting spontaneous combustion of coal as well as a preparation method and an application of the temperature-sensitive phase-change gel material. The temperature-sensitive phase-change gel material comprises the following components: a water-absorbing monomer polyethylene glycol, methyl cellulose, sodium carboxymethyl cellulose, magnesium hydroxide, a bentonite suspension, a kaolin suspension and the balance of water at 40-50 DEG C, and the temperature-sensitive phase-change gel material is prepared by blending and weak crosslinking. For an inclined coal seam, after the temperature-sensitive phase-change gel material and a temperature-sensitive coating inhibitor are uniformly mixed, a mixture has relatively strong fluidity in an initial low-temperature state, coating small balls can be transported to a goaf and a coal seam prone to spontaneous combustion through a pipeline, and the effect of bonding the coating small balls to the inclined coal seam is achieved; if the temperature of the coal seam is raised to 60-70 DEG C through spontaneous combustion, the temperature-sensitive coating releases the inhibition solution, the temperature-sensitive colloid makes contact with the inhibition solution, salting-out occurs, phase change occurs at about 78 DEG C, the temperature-sensitive colloid permeates into coal seam cracks and is dehydrated to generate a quasi-solid with a film, and 70 DEG C wax combustion of the temperature-sensitive coating inhibitor is effectively inhibited. The long-term low-temperature oxidation inhibition and high-temperature flame-retardant effects on the coal are realized.

Description

technical field [0001] The invention relates to the technical field of spontaneous combustion of coal, in particular to a temperature-sensitive phase-change gel material for inhibiting spontaneous combustion of coal, a preparation method and application thereof. Background technique [0002] More than 90% of mine fires are caused by coal spontaneous combustion during coal mining. So far, more than 800 working faces have been closed due to fire, freezing and losing about 200 million tons of coal resources, and causing serious pollution of water resources, soil, vegetation, and the atmosphere, threatening the environment for human survival. In order to control coal spontaneous combustion, technologies such as grouting, nitrogen injection, spraying inhibitors, colloidal material injection, and foam injection are usually used to prevent coal spontaneous combustion in mines. The effect is not ideal. [0003] Aiming at the drawbacks of existing inhibitors, the research team with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K21/14C09K21/02C09K5/06A62D1/00
CPCC09K21/14C09K21/02C09K5/063A62D1/0064
Inventor 蒋曙光张悦邵昊吴征艳陈宇熙赵真诚
Owner CHINA UNIV OF MINING & TECH
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