CN114526112A - Rubber CO based on stopping agent skeleton2Hydrate ball and application thereof - Google Patents

Abstract

The invention belongs to the technical field of coal mine fire prevention and control, and provides a rubber CO based on a stopping agent framework₂Hydrate ball comprising an inner rubber shell, an outer rubber shell, CO₂Hydrate, steel needle and stopping agent skeleton. The invention also provides rubber CO based on the inhibitor skeleton₂Application of hydrate spheres. The invention relates to rubber CO based on a retardant framework₂Hydrate ball utilization of CO₂Hydrate and inhibitor for inhibiting spontaneous combustion of coal body₂The hydrate can store CO in large quantity₂The characteristics of the gas and the principle of preventing spontaneous combustion of the stopping agent solution are combined, and spontaneous combustion of the coal in the goaf can be inhibited to the maximum extent.

Description

A kind of rubber CO2 hydrate ball based on inhibitor skeleton and its application

technical field

The invention relates to the technical field of coal mine fire prevention and control, in particular to a rubber CO ₂ hydrate ball based on an inhibitor skeleton and an application thereof.

Background technique

For the goaf of a coal mine, there is a danger of fire in any case, especially the coal fire disaster caused by the spontaneous combustion of coal left in the goaf. In the process of coal fire disaster, the main danger comes from the failure of prevention and control of spontaneous combustion of coal. Once the failure occurs, the reaction between coal and oxygen will accelerate sharply after the coal spontaneous combustion development stage enters violent oxidation. The most serious situation is that the development of spontaneous combustion of coal is not controlled in time during the mining process. In the case of failure of prevention and control, the heat released by the spontaneous combustion of coal cannot be dissipated, and the heat is continuously accumulated and conducted in the coal left in the goaf, resulting in violent occurrence. The chain reaction of coal and oxygen will inevitably cause large-scale coal field fires, resulting in casualties and waste of coal resources. The heat of reaction accumulates in the leftover coal, and the increase in the temperature of the leftover coal leads to a significant increase in the reaction rate or heat transfer efficiency between coal and oxygen, which may further lead to coal dust gas explosions and large-area coalfield fires, resulting in out-of-control fires. Coal mine casualties, shutdowns, explosions, geological disasters and other risks occur.

Therefore, it is of great significance to study the prevention and control methods of spontaneous combustion of coal leftovers in goafs, and to provide effective methods to prevent and control spontaneous combustion of coal leftovers and devices to prevent spontaneous combustion.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a rubber CO ₂ hydrate ball based on inhibitor skeleton and its application in order to overcome the deficiencies of the prior art.

In order to achieve the above-mentioned purpose of the invention, the present invention provides the following technical solutions:

The present invention provides a rubber CO ₂ hydrate ball based on a chemical inhibitor skeleton, comprising an inner rubber shell 1 , an outer rubber shell 2 , a CO ₂ hydrate 3 , a steel needle 4 and a chemical inhibitor skeleton 5 .

Preferably, the inhibitor skeleton 5 is a hollow spherical structure, and the inhibitor is an inorganic salt-based solid inhibitor.

Preferably, the steel needle 4 is arranged in the inhibitor skeleton 5 between the inner rubber shell 1 and the outer rubber shell 2 .

Preferably, the bursting time of the rubber CO ₂ hydrate ball is 6-8 days.

Preferably, the inner rubber shell 1 and the outer rubber shell 2 can expand and contract, and the outer rubber shell 2 is used to isolate the air and the chemical inhibitor skeleton.

The present invention also provides an application of the inhibitor skeleton-based rubber CO ₂ hydrate ball in the prevention and control of spontaneous combustion in a coal mine goaf, and the rubber CO ₂ hydrate ball is arranged inside the coal mine goaf.

The beneficial effects of the present invention include:

The rubber CO ₂ hydrate ball based on the inhibitor skeleton provided by the invention utilizes the advantages of CO ₂ hydrate and the inhibitor to inhibit the spontaneous combustion of coal, and combines the characteristics of CO ₂ hydrate that can store a large amount of CO ₂ gas and the inhibitor solution. Combined with the principle of preventing spontaneous combustion, the spontaneous combustion of coal in the goaf can be suppressed to the greatest extent.

The invention takes CO ₂ hydrate expansion as the core, and the inhibitor skeleton is supplemented. Under the condition of no human interference, CO ₂ hydrate is used to continuously release CO ₂ gas, causing the rubber CO ₂ hydrate ball to burst or contact the steel. When the needle breaks, the CO ₂ hydrate and the inhibitor are fully mixed, and the CO ₂ gas is automatically released. At the same time, the water and the inhibitor form an inhibitor solution. The CO ₂ gas is fully released into the goaf, and the inhibitor solution is sprayed on the coal pillars or coal lumps left in the goaf, covering the surface of the remaining coal, thereby inhibiting the coal-oxygen reaction and playing a good inhibitory role. . At the same time, these salts with strong water absorption can keep the left coal in a watery and humid state for a long time, and the endothermic cooling effect of water during evaporation keeps the coal body at a low temperature, which inhibits the development of the initial oxidation of the left coal.

Description of drawings

Fig. 1 is a schematic structural diagram of the rubber CO ₂ hydrate ball based on the inhibitor skeleton of the present invention, wherein 1 is an inner rubber shell, 2 is an outer rubber shell, 3 is CO ₂ hydrate, 4 is a steel needle, and 5 is a Inhibitor skeleton;

Fig. 2 is the internal structure diagram of the chemical inhibitor skeleton of the present invention, wherein 1 is the inner rubber shell, 2 is the outer rubber shell, 4 is the steel needle, and 5 is the chemical inhibitor skeleton;

Figure 3 is the layout diagram of the rubber CO ₂ hydrate ball based on the inhibitor framework of the present invention in the goaf of the coal mine, wherein, 6 is the rubber CO ₂ hydrate ball, 7 is the gob, and 8 is the working face air intake , 9 is the return air of the working face;

Figure 4 is a working flow chart of the inhibitor skeleton-based rubber CO ₂ hydrate ball of the present invention.

Detailed ways

The present invention provides a rubber CO ₂ hydrate ball based on a chemical inhibitor skeleton, as shown in Figure 1, comprising an inner rubber shell 1, an outer rubber shell 2, a CO ₂ hydrate 3, a steel needle 4 and a chemical inhibitor skeleton 5.

The internal structure diagram of the chemical inhibitor skeleton of the present invention is shown in FIG.

The inhibitor skeleton 5 of the present invention is preferably a hollow spherical structure, and the inhibitor is preferably an inorganic salt solid inhibitor, more preferably an inorganic sodium salt or an inorganic potassium salt, more preferably sodium nitrate, sodium sulfate, chloride Sodium, sodium acetate, potassium chloride, potassium nitrate, potassium sulfate or potassium phosphate.

In the present invention, the inhibitor skeleton is wrapped with a layer of rubber shell (outer rubber shell), which is used to isolate the air from the inhibitor skeleton and prevent the inhibitor from reacting with other substances to reduce the resistance rate; The skeleton made of the agent can support the whole device and ensure that more CO ₂ hydrate can be loaded, and the inhibitor has a significant effect in coal mine fire prevention and fire fighting.

In the present invention, the skeleton of the inhibitor is combined with water to form a layer of water-liquid film on the surface of the coal body, preventing the oxygen in the air from contacting the coal, preventing the occurrence of the carboxyl group reaction, and then playing the role of controlling the oxidation reaction; On the other hand, by controlling external factors such as oxygen concentration and temperature in the coal oxidation process, when the coal body is oxidized to generate heat, the water-liquid film is conducive to the dissipation of heat, which can isolate oxygen, absorb heat and cool down, and inhibit the coal body oxidation in the goaf. The temperature is increased, and the purpose of reducing the oxidation reaction is finally achieved.

The steel needle 4 of the present invention is preferably arranged in the inhibitor skeleton 5 between the inner rubber shell 1 and the outer rubber shell 2 .

In the present invention, the steel needle pierces the inner rubber shell and CO ₂ hydrate when the inner rubber shell expands to a certain extent and has not burst, so as to ensure that both the CO ₂ hydrate and the inhibitor skeleton can be fully combined.

The inner rubber shell 1 and the outer rubber shell 2 according to the present invention can expand and contract, and the outer rubber shell 2 is used to isolate the air and the chemical inhibitor skeleton.

In the present invention, the inner rubber shell and the outer rubber shell are preferably composed of stretchable rubber balls, which have good stretchability; the interior of the inner rubber shell is filled with a large amount of CO ₂ hydrate, and the CO ₂ obtained by the decomposition of CO ₂ hydrate The gas is used to prevent and extinguish the coal mine goaf.

In the present invention, CO ₂ hydrate can store a large amount of CO ₂ gas, CO ₂ gas is non-polluting, and the effects of CO ₂ gas suffocation, inert oxygen barrier, adsorption and inhibition are far greater than other gases; in addition, coal The ability to adsorb CO ₂ gas is much greater than that of other inert gases. Therefore, the present invention adopts CO ₂ hydrate in the prevention and control of spontaneous combustion in the coal mine goaf.

In the present invention, the expansion time of the rubber CO ₂ hydrate ball is set according to the expansion and contraction characteristics of the inner rubber shell and the outer rubber shell and the decomposition rate of CO ₂ in the CO ₂ hydrate, and the expansion and cracking will occur when the expansion and contraction reaches the limit. , to protect the CO ₂ hydrate from being released when it is not needed, so that the CO ₂ hydrate can be released to the goaf under specified conditions.

In the present invention, the bursting time of the rubber CO ₂ hydrate ball is preferably 6 to 8 days, more preferably 7 days.

In the present invention, the CO ₂ hydrate is preferably prepared by a stirring disturbance method, and the gas storage rate of the CO ₂ hydrate is improved by a constant stirring rate.

In the present invention, after the CO ₂ hydrate bursts, the water generated by the CO ₂ hydrate and the inhibitor skeleton form an inhibitor solution.

The present invention also provides an application of the inhibitor skeleton-based rubber CO ₂ hydrate ball in the prevention and control of spontaneous combustion in a coal mine goaf, and the rubber CO ₂ hydrate ball is arranged inside the coal mine goaf.

The layout diagram of the rubber CO ₂ hydrate ball based on the inhibitor framework of the present invention in the coal mine goaf is shown in Figure 3, wherein 6 is the rubber CO ₂ hydrate ball, 7 is the goaf, and 8 is the working face Inlet air, 9 is the return air of the working face.

In the present invention, the number of rubber _{CO 2} hydrate balls is arranged according to the actual situation of the goaf of the coal mine. It is preferable to gradually place rubber CO ₂ hydrate balls in the goaf of the coal mine to inhibit the spontaneous combustion of the coal body in the goaf.

The working flow chart of the inhibitor skeleton-based rubber CO ₂ hydrate ball of the present invention is shown in FIG. 4 .

The technical solutions provided by the present invention will be described in detail below with reference to the examples, but they should not be construed as limiting the protection scope of the present invention.

Example 1

A rubber CO ₂ hydrate ball based on a chemical inhibitor skeleton, comprising an inner rubber shell, an outer rubber shell, a CO ₂ hydrate, a steel needle and a chemical inhibitor skeleton. The skeleton of the inhibitor is a hollow spherical structure, and the inhibitor is a solid inhibitor of sodium nitrate. The inner rubber shell and the outer rubber shell are composed of retractable rubber balls, which have good scalability; the inhibitor skeleton is between the inner rubber shell and the outer rubber shell, and the outer rubber shell is used to isolate the air from the inhibitor skeleton, preventing Inhibitors react with other substances. The steel needle is arranged in the inhibitor skeleton. The inside of the inner rubber shell is filled with a large amount of _{CO 2} hydrate, which is prepared by a constant stirring rate. The burst time of the rubber CO ₂ hydrate ball is 7 days.

When the rubber CO ₂ hydrate ball based on the inhibitor skeleton is used in the goaf of the coal mine, with the continuous advancement of the working face, the rubber CO ₂ hydrate ball is gradually placed in the goaf of the coal mine to suppress the spontaneous combustion of the coal in the goaf. .

Example 2

The sodium nitrate solid inhibitor of embodiment 1 is replaced by sodium sulfate solid inhibitor, sodium chloride solid inhibitor, sodium acetate solid inhibitor, potassium chloride solid inhibitor, potassium nitrate solid inhibitor, Potassium sulfate solid inhibitor or potassium phosphate solid inhibitor, other conditions are the same as in Example 1.

The rubber CO ₂ hydrate ball based on the inhibitor skeleton provided by the invention utilizes the advantages of CO ₂ hydrate and the inhibitor to inhibit the spontaneous combustion of coal, and combines the characteristics of CO ₂ hydrate that can store a large amount of CO ₂ gas and the inhibitor solution. Combined with the principle of preventing spontaneous combustion, the spontaneous combustion of coal in the goaf can be suppressed to the greatest extent. The invention takes CO ₂ hydrate expansion as the core, and the inhibitor skeleton is supplemented. Under the condition of no human interference, CO ₂ hydrate is used to continuously release CO ₂ gas, causing the rubber CO ₂ hydrate ball to burst or contact the steel. The needle is broken, and the CO ₂ hydrate is fully mixed with the inhibitor, and the CO ₂ gas is automatically released, while the water and the inhibitor form an inhibitor solution. The CO ₂ gas is fully released into the goaf, and the inhibitor solution is sprayed on the coal pillars or coal lumps left in the goaf, covering the surface of the remaining coal, thereby inhibiting the coal-oxygen reaction and playing a good inhibitory role. . At the same time, these salts with strong water absorption can keep the left coal in a watery and humid state for a long time, and the endothermic cooling effect of water during evaporation keeps the coal body at a low temperature, which inhibits the development of the initial oxidation of the left coal.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (6)

1. A rubber CO ₂ hydrate ball based on a chemical inhibitor skeleton, characterized in that it comprises an inner rubber shell (1), an outer rubber shell (2), a CO ₂ hydrate (3), a steel needle (4) and Inhibitor skeleton (5). 2 . The rubber CO ₂ hydrate ball according to claim 1 , wherein the inhibitor skeleton ( 5 ) has a hollow spherical structure, and the inhibitor is an inorganic salt-based solid inhibitor. 3 . 3. The rubber CO ₂ hydrate ball according to claim 1 or 2, characterized in that the steel needle (4) is arranged in the chemical inhibitor skeleton between the inner rubber shell (1) and the outer rubber shell (2) (5). 4 . The rubber CO ₂ hydrate ball according to claim 3 , wherein the expansion time of the rubber CO ₂ hydrate ball is 6-8 days. 5 . 5. The rubber CO ₂ hydrate ball according to claim 4, characterized in that the inner rubber shell (1) and the outer rubber shell (2) can expand and contract, and the outer rubber shell (2) is used for isolating air and resistance. chemical skeleton. 6. The application of the inhibitor skeleton-based rubber CO ₂ hydrate balls in the prevention and control of spontaneous combustion in coal mine goafs according to any one of claims 1 to 5, wherein the rubber CO ₂ hydrate balls are arranged in a Inside the goaf of a coal mine.

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