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Foamed gel for preventing and controlling spontaneous combustion of coal in goaf and application

A technology of gel foam and coal spontaneous combustion, which is applied in dust prevention, mining equipment, earthwork drilling and mining, etc., can solve the problems of poor oxygen barrier capacity of leftover coal plugging, poor water retention capacity of two-phase foam, and massive dehydration, etc., and achieves improved Stability and water retention performance, suppression of coal spontaneous combustion, good water absorption effect

Active Publication Date: 2018-10-26
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The grouting technology is prone to the phenomenon of pulling grooves, so that the slurry cannot cover the coal evenly, and the water retention of the slurry is poor, which will cause a large amount of dehydration, and even lead to the occurrence of slurry running and collapsing, which will affect the normal production of the working face; gel fire extinguishing has many problems. Large limitations, the gel has poor flow ability in the goaf, the penetration range is small, it is not suitable for extinguishing large-scale fires, the cost of use is high, and the ammonium salt gel has a great impact on the environment; conventional two-phase foam water retention The capacity is poor, water will start to separate in less than 10 minutes, the half-life of foam is short, and the ability to block and block the residual coal is poor

Method used

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  • Foamed gel for preventing and controlling spontaneous combustion of coal in goaf and application
  • Foamed gel for preventing and controlling spontaneous combustion of coal in goaf and application
  • Foamed gel for preventing and controlling spontaneous combustion of coal in goaf and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Determine the mass percent of the gel foam base liquid to be 50 g, wherein the mass percent of foaming agent is 0.4 percent, the mass percent of foam stabilizer is 2 percent, the mass percent of gel-forming substance is 0.6 percent, and the rest is water. After adding foaming agent and foam stabilizer into water at the same time, use the hole plate hitting method for initial foaming, and stop foaming when the foam reaches 80% of the maximum foaming volume; then, add the gel-forming substance into the initiated foam, The final foaming is carried out by perforated disk blowing method.

[0030] After placing the coal sample soaked in gel foam and the coal sample soaked in water under the same conditions for 7 days, the temperature program was used to simulate the coal spontaneous combustion process, and the cross point temperature was tested. It was found that the coal sample treated with gel foam, the cross The point temperature is about 20°C higher than the intersection ...

Embodiment 2

[0032] Determine the mass percent of the gel foam base liquid to be 50 g, wherein the mass percent of foaming agent is 0.5 percent, the mass percent of foam stabilizer is 3 percent, the mass percent of gel-forming substance is 0.7 percent, and the rest is water. After adding foaming agent and foam stabilizer into water at the same time, use hole plate hitting method for initial foaming, and stop foaming until 80% of the maximum foaming volume; The final foaming is carried out by perforated disk blowing method.

[0033] Using the same method as in Example 1, the resistance rate of the gel foam at 100° C. was calculated to be Eco=68%, indicating that the gel foam of the present invention has a good effect of preventing coal spontaneous combustion.

Embodiment 3

[0035] Determine the quality of gel foam base liquid to be 50g, wherein the mass percentage of foaming agent is 0.6%, the mass percentage of foam stabilizer is 2.5%, the mass percentage of gel-forming substance is 0.8%, and the rest is water. After adding foaming agent and foam stabilizer into water at the same time, use hole plate hitting method for initial foaming, and stop foaming until 80% of the maximum foaming volume; The final foaming is carried out by perforated disk blowing method.

[0036] Using the same method as in Example 1, the resistance rate Eco=69% of the gel foam at 100° C. was calculated, indicating that the gel foam of the present invention has a good effect of preventing coal spontaneous combustion.

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Abstract

The invention discloses foamed gel for preventing and controlling spontaneous combustion of coal in a goaf and application. The foamed gel is prepared from raw materials including a foaming agent, a foam stabilizer, a gelling substance and water, wherein the foaming agent is a composite foaming agent prepared from lauryl sodium sulfate, sodium dodecyl benzene sulfonate and dicyl polyglycoside, thefoam stabilizer is a mixture of sodium silicate and xanthan gum, and the gelling substance is a mixture of polyacrylamide and guar gum. The foamed gel has adsorptive property. After the substances are mixed and foamed, the formed foamed gel has long water retention time and long foam half-life period, and the improved foamed gel has good adsorptive property. After the foamed gel is injected intoan area where spontaneous combustion of coal is likely to occur, a coal body can be effectively coated, cooling is conducted on residual coal, a layer of oxygen isolation film can be formed on the surface of the residual coal after foam bursting to isolate contact between the coal and oxygen, and spontaneous combustion of coal can be permanently prevented and controlled.

Description

technical field [0001] The invention relates to the application field of coal mine fire prevention and extinguishing technology, in particular to a gel foam used for preventing coal spontaneous combustion in goafs. Background technique [0002] Coal spontaneous combustion is common in the mine production process in my country. Mine fires caused by coal spontaneous combustion will not only burn a large amount of coal resources, but also produce toxic and harmful gases, seriously endangering the lives of underground personnel; coal spontaneous combustion also often induces gas and coal dust explosions, bringing huge disasters to mines. In order to prevent coal spontaneous combustion, conventional anti-fire extinguishing technologies such as grouting, gel injection, and foam injection are generally used, but these anti-fire extinguishing technologies have certain defects and deficiencies. The grouting technology is prone to the phenomenon of pulling grooves, so that the slurry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F5/08
CPCE21F5/08
Inventor 仲晓星张军委陈龙秦波涛侯飞
Owner CHINA UNIV OF MINING & TECH
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