Inhibitor for inhibiting high-sulfur coal from spontaneous combustion

An inhibitor, high-sulfur coal technology, applied in safety devices, mining equipment, earthwork drilling, etc. It has the effect of suppressing temperature rise and ensuring wettability

Active Publication Date: 2015-12-16
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these inhibitors for inhibiting spontaneous combustion of coal are not highly targeted to passivate active groups. The inhibitors are not selected according to the type and nature of the specific active groups of the coal species, and the effect of the inhibitors is greatly affected.

Method used

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  • Inhibitor for inhibiting high-sulfur coal from spontaneous combustion
  • Inhibitor for inhibiting high-sulfur coal from spontaneous combustion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The inhibitor of the high-sulfur coal spontaneous combustion of the present embodiment, its composition is by mass percentage: MgCl 2 15%, ZnCl 2 3%, NH 4 Cl0.2%, sodium lauryl sulfate 0.5%, sodium tetraborate 0.3%, and the balance is solvent water.

[0019] According to the TG curve of the coal sample under the condition of temperature programming, the inhibitory effect of the inhibitor is analyzed, and the specific process is as follows:

[0020] Firstly, the raw coal sample was pulverized with a ball mill, and then the raw coal sample with a particle size of 0.150 mm was sieved by a sampling sieve as the experimental raw coal sample, and put into a grinding bottle for later use.

[0021] Weigh 1000mg of raw coal sample, measure 1ml of the prepared inhibitor solution, fully mix the raw coal sample with the inhibitor, place in a cool, ventilated place, and after standing for 7 days, carry out thermogravimetric analysis. The experimental heating rate is 5 ℃ / min, reac...

Embodiment 2

[0027] The inhibitor of the high-sulfur coal spontaneous combustion of the present embodiment, its composition is by mass percentage: MgCl 2 16%, ZnCl 2 5%, NH 4 Cl 0.1%, sodium lauryl sulfate 0.8%, sodium tetraborate 0.4%, and the balance is solvent water.

[0028] Through the same thermogravimetric analysis experiment process, the oxidative spontaneous combustion dehydration stage of the raw coal sample soaked by the inhibitor of this embodiment was delayed from 121.3°C to 238.1°C, while the activation energy of the oxidative spontaneous combustion weight gain stage was changed from 112.20kJ / mol Increased to 262.70kJ / mol, effectively preventing the spontaneous combustion of high-sulfur coal.

Embodiment 3

[0030] The inhibitor of the high-sulfur coal spontaneous combustion of the present embodiment, its composition is by mass percentage: MgCl 2 17%, ZnCl 2 2%, NH 4 Cl0.15%, sodium lauryl sulfate 1%, sodium tetraborate 0.5%, and the balance is solvent water.

[0031] Through the same thermogravimetric analysis experiment process, the oxidative spontaneous combustion dehydration stage of the raw coal sample soaked by the inhibitor of this example was delayed from 121.3°C to 237.8°C, while the activation energy of the oxidative spontaneous combustion weight gain stage was changed from 112.20kJ / mol Increased to 259.56kJ / mol, effectively preventing the spontaneous combustion of high-sulfur coal.

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Abstract

The invention belongs to the technical field of coal mine safety and particularly relates to an inhibitor for inhibiting high-sulfur coal from spontaneous combustion. The inhibitor for inhibiting high-sulfur coal from spontaneous combustion comprises the following ingredients by mass percent: 15-17 percent of MgCl2, 2-5 percent of ZnCl2, 0.1-0.2 percent of NH4Cl, 0.5-1 percent of sodium dodecyl sulfate, 0.3-0.5 percent of sodium tetraborate and the balance of solvent water. The inhibitor for inhibiting high-sulfur coal from spontaneous combustion can guarantee the wettability of coal, effectively prevents active structures in coal from reacting with oxygen, avoids temperature rise of coal, and therefore, achieves a favorable inhibition effect.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety, and in particular relates to a chemical inhibitor for inhibiting spontaneous combustion of high-sulfur coal. technical background [0002] Coal spontaneous combustion is one of the major disasters that seriously threaten the safety of coal mine production. With the increase of sulfur content in coal, the tendency of coal spontaneous combustion also increases. At present, there are many kinds of inhibitors used in coal mines, including polymer inhibitors, such as strong oxidizing agents such as urea peroxide, which can oxidize the easily oxidized structures and groups in the coal structure, especially on the surface of the coal body, to form stable Substances that lose their oxidative properties, so that the coal body will no longer oxidize with oxygen and improve safety; also include gel inhibitors, mainly sodium alginate, water glass, super absorbent resin, etc., such inhibitors Inhibi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F5/06
CPCE21F5/06
Inventor 戴凤威邓汉忠邓存宝王雪峰高飞武司苑
Owner LIAONING TECHNICAL UNIVERSITY
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