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Stopping agent for preventing self-combustion of coal

A chemical inhibitor, coal spontaneous combustion technology, applied in the direction of fire prevention, dust prevention, safety devices, etc., can solve the problems of limited chemical inhibition effect of chemical inhibitor, can not effectively reduce the spontaneous combustion of coal leftover, etc., to reduce the occurrence of coal spontaneous combustion. Effect

Inactive Publication Date: 2018-07-10
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main function of the use of inhibitors is to isolate the residual coal from oxygen. The inhibitors in the prior art have very limited inhibitory effects and cannot effectively reduce the occurrence of spontaneous combustion of residual coal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this embodiment, the inhibitor used to prevent spontaneous combustion of coal includes components and the mass percentage concentration in the inhibitor is: reducing metal powder 2%, inorganic salt 6%, binder 0.4%, filler 6%, water is 85.6%.

[0020] In this embodiment, the reducing metal powder in the inhibitor can chemically react with the oxygen in the air, thereby consuming the oxygen around the leftover coal. In addition to the inorganic salt in the inhibitor can play the role of oxygen isolation and cooling on the residual coal, the metal ions in the inorganic salt can form a coordination structure with the active groups of N, S and P in the coal, reducing the coal and Oxygen reaction activity, thereby alleviating the process of coal oxidative spontaneous combustion. In addition, the binder can facilitate the reaction of the reducing metal powder with oxygen. The filler is used to improve air permeability.

[0021] To sum up, on the one hand, the inhibitor c...

Embodiment 2

[0031] In this embodiment, the inhibitor used to prevent spontaneous combustion of coal includes components and the mass percentage concentration in the inhibitor is: reducing metal powder 4%, inorganic salt 15%, binder 0.8%, filler 7%, water is 73.2%.

[0032] In this embodiment, sodium chloride is used as the inorganic salt; reduced iron powder is used as the reducing metal powder; and acrylamide is used as the binder. The filler is diatomaceous earth.

[0033] In the present embodiment, the inhibitor is prepared according to the following steps, and the following parts are parts by weight:

[0034] Step a, grinding the reduced iron powder to be less than 200 meshes, prepare 400 parts;

[0035] Step b, taking 1500 parts of sodium chloride and fully mixing with 4000 parts of water at 30 ° C, stirring for 10 to 20 minutes;

[0036] Step c. Cover 80 parts of adhesive and 700 parts of filler on 400 parts of iron powder to prevent the iron powder from reacting with oxygen in a...

Embodiment 3

[0040] In this embodiment, the inhibitor used to prevent spontaneous combustion of coal includes components and the mass percent concentration in the inhibitor is: the mass percent concentration of the reducing metal powder in the inhibitor is 3%, The mass percent concentration of the inorganic salt in the inhibitor is 10%, the mass percent concentration of the binder in the inhibitor is 0.6%, and the mass percent concentration of the filler in the inhibitor is 6.5%. .

[0041] In this embodiment, the inorganic salt is potassium chloride; the reducing metal powder is reducing magnesium powder or reducing aluminum powder; the binder is acrylamide. The filler is diatomaceous earth.

[0042] In the present embodiment, the inhibitor is prepared according to the following steps, and the following parts are parts by weight:

[0043] Step s1. Grinding the reduced aluminum powder into a size smaller than 200 mesh, and preparing 300 parts;

[0044] Step s2, taking 1000 parts of pota...

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Abstract

The invention discloses a stopping agent for preventing self-combustion of coal. The stopping agent comprises the components of, by mass concentration, 2-4% of reducing metal powder, 6-15% of inorganic salt, 0.4-0.8% of adhesion agents, 6-7% of fillers and the balance water. According to the stopping agent, on the one hand, the effect of isolation of the coal and oxygen can be achieved, on the other hand, the oxygen can be effectively consumed, the content of the oxygen is decreased, and thus the coal self-combustion possibility is minimized.

Description

technical field [0001] The invention belongs to the technical field of chemical inhibitors, and in particular relates to a chemical inhibitor used to prevent spontaneous combustion of coal. Background technique [0002] Spontaneous combustion of coal is a phenomenon in which coal catches fire without being ignited. When coal with a tendency to spontaneous combustion encounters oxygen in the air, the heat generated by the oxidation reaction is greater than the heat lost to the surrounding environment, and heat accumulation occurs. The process in which the temperature of coal rises to the ignition point and ignites. Coal seam outcrops, old holes, and coal piles are all places that are prone to spontaneous combustion of coal. Spontaneous combustion of coal not only wastes underground coal resources, but also affects coal mine production and safety. The reason for the spontaneous combustion of coal is mainly that the coal is oxidized in contact with air. On the one hand, the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F5/06
CPCE21F5/06
Inventor 翟小伟葛晖邓军王凯肖旸王彩萍
Owner XIAN UNIV OF SCI & TECH
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