Preparation process of energy-absorbing anti-attrition filling material for buried pipe type waste mine compressed air energy storage system

Abstract

The invention discloses a preparation process of an energy-absorbing anti-attrition filling material for a buried pipe type waste mine compressed air energy storage system, which comprises the following steps: (1) adding sodium stearate and graphite powder into hot water, stirring until the sodium stearate is fully dissolved, and then adding graphitized coal gangue particles into the obtained liquid phase for ultrasonic treatment; and drying the water in the reaction system by distillation to obtain the pretreated coal gangue particles. And (2) mixing the pretreated coal gangue particles with tetraethoxysilane, performing ultrasonic treatment, and then putting the mixture into saturated lime water for heating and heat preservation to obtain the self-lubricating anti-attrition coal gangue particles. And (3) uniformly mixing the self-lubricating anti-attrition coal gangue particles with rubber particles to obtain the filling material. The portion between the outer wall of the energy storage pipeline and the cavity is filled with the material layer with the energy absorption function, the probability that the energy storage pipeline is damaged can be effectively reduced, friction between the filling material and the outer wall of the energy storage pipeline is reduced, and damage to the outer wall of the energy storage pipeline is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of compressed air energy storage, and in particular to a preparation process of energy-absorbing and wear-reducing filling materials for a buried pipe abandoned mine compressed air energy storage system. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] ‌Compressed Air Energy Storage (CAES)‌ is a storage technology that transfers excess electricity during low-power periods into compressed air for storage, and releases compressed air during peak power periods to drive turbines to generate electricity, thereby achieving full utilization of electricity and reducing waste. It is currently a very promising new energy storage technology. This energy storage technology has the advantages of large energy storage, long-term energy storage, large-scale application, and no pollutant emissions. At the same time, this energy storage technology also has the problem of high construction costs. The professional equipment and materials it requires require a large amount of capital investment, especially the underground caverns used to store compressed air energy storage pipelines, which require complex engineering design and construction to achieve.

[0004] Using abandoned mine tunnels as storage places for compressed air energy storage pipelines can not only significantly reduce construction costs, but also realize high-value resource utilization of abandoned mine tunnels. However, the inventors found that after laying compressed air energy storage pipelines in abandoned mine tunnels, there is a risk of damage to the energy storage pipeline due to rock blocks falling or even collapse in the tunnels due to external factors and the mine's own structural factors. How to prevent the occurrence of such problems is crucial to ensuring the safety and normal operation of energy storage pipelines. Summary of the invention

[0005] In view of the above problems, the present invention provides a preparation process for energy-absorbing and wear-reducing filling materials for buried pipe abandoned mine compressed gas energy storage systems. The present invention can not only effectively reduce the probability of damage to the energy storage pipeline by filling a material layer with energy-absorbing function between the outer wall of the energy storage pipeline and the cavern, but also reduce the friction between the filling material and the outer wall of the energy storage pipeline, which helps to reduce damage to the outer wall of the energy storage pipeline. Specifically, the technical solution of the present invention is as follows.

[0006] The preparation process of the energy-absorbing and wear-reducing filling material of the buried pipe abandoned mine compressed gas energy storage system comprises the following steps: (1) The coal gangue is graphitized in an atmosphere isolated from air to graphitize the organic matter therein, and after completion, it is cooled to room temperature and crushed to obtain graphitized coal gangue particles for later use.

[0007] (2) Sodium stearate and graphite powder are added to hot water and stirred until the sodium stearate is fully dissolved, and then the graphitized coal gangue particles are added to the obtained liquid phase for ultrasonic treatment. After completion, the water in the reaction system is evaporated to obtain pretreated coal gangue particles for standby use.

[0008] (3) The pretreated gangue particles are mixed with tetraethoxysilane and then ultrasonically treated, and then the particles are separated and placed in saturated lime water for heating and insulation. After the separation, the particles are dried to obtain self-lubricating and anti-friction gangue particles.

[0009] (4) The self-lubricating and anti-friction coal gangue particles and rubber particles are mixed evenly to obtain the filling material.

[0010] Furthermore, in step (1), the particle size of the coal gangue particles is distributed between 8 and 20 mm. Preferably, the content of organic matter in the coal gangue is not less than 15%.

[0011] Furthermore, in step (1), the graphitization temperature is 1850-2000° C. and the time is 5-7 hours. Optionally, the atmosphere includes any one of nitrogen, argon, etc.

[0012] Furthermore, in step (2), the temperature of the hot water is 60-90° C. to facilitate the full dissolution of the sodium stearate.

[0013] Furthermore, in step (2), the sodium stearate in the liquid phase is saturated, and the content of the graphite powder is 7-10 g / L. Optionally, the fineness of the graphite powder is 500-800 mesh.

[0014] Furthermore, in step (2), the solid-liquid ratio of the graphitized coal gangue particles to the liquid phase is 1 g: 30-50 ml.

[0015] Furthermore, in step (2), the ultrasonic treatment time is 40-60 min, and the ultrasonic power is 200-300 W. Optionally, the evaporation temperature in step (2) is 100-130°C.

[0016] Furthermore, in step (3), the solid-liquid ratio of the pretreated coal gangue particles to tetraethoxysilane is 1 g: 5-10 ml.

[0017] Furthermore, in step (3), the ultrasonic treatment time is 30-40 min, and the ultrasonic power is 200-300 W.

[0018] Furthermore, in step (3), the solid-liquid ratio of the pretreated coal gangue particles to saturated lime water is 1 g: 40-50 ml.

[0019] Furthermore, in step (3), the heating temperature is 45-60° C., and the insulation time is 8-12 hours.

[0020] Furthermore, in step (4), the mass ratio of the self-lubricating and anti-friction coal gangue particles to the rubber particles is 3.2 to 4: 1. Optionally, the particle size distribution of the rubber particles is between 2 and 5 mm.

[0021] Compared with the prior art, the present invention has at least the following beneficial technical effects: The present invention not only effectively prevents the energy storage pipeline from being damaged by filling a material layer with energy absorption function between the outer wall and the cavern of the compressed air energy storage pipeline, but also reduces the friction between the outer wall and the material layer during the expansion and contraction of the energy storage pipeline, thereby reducing the damage to the outer wall of the energy storage pipeline. To this end, the present invention uses coal gangue, a large industrial solid waste, as a raw material and graphitizes it, thereby utilizing the characteristics of containing more organic matter in the coal gangue to convert it into a graphite component with good friction reduction effect. At the same time, the silicon, magnesium, calcium, iron and other elements contained in the coal gangue are used as catalysts to reduce the graphitization temperature, promote the formation of graphite, and realize the resource utilization of coal gangue. Furthermore, a large number of pores are distributed in the coal gangue after graphitization, which easily leads to a decrease in its compressive strength. For this reason, the present invention loads sodium stearate and graphite in the coal gangue after graphitization and then loads tetraethoxysilane, and after reacting it with saturated lime water, on the one hand, the sodium stearate reacts with calcium hydroxide to form calcium stearate distributed in the coal gangue, further improving the anti-friction effect of the coal gangue. On the other hand, the active nano silicon dioxide formed after the tetraethoxysilane is hydrolyzed in alkaline saturated lime water reacts with calcium hydroxide to form hydrated calcium silicate, which not only helps to improve the compression resistance of the coal gangue, but also helps to anchor the graphite and calcium stearate on the coal gangue, reducing its falling off during use. In addition, since the graphite in the coal gangue particles is converted from the organic matter in situ therein, the graphite component is evenly distributed in the coal gangue from the inside to the outside, so that the coal gangue as a whole has an anti-friction effect, thereby preventing the problem that the anti-friction effect of the new surface is significantly reduced due to the lack of the sodium stearate and graphite loaded in the later stage after the coal gangue particles are damaged. The present invention compounds the self-lubricating and anti-friction coal gangue particles obtained through the above-mentioned treatment with rubber particles to form a filling material. After filling between the outer wall of the compressed air energy storage pipeline and the cavern, it can not only absorb and reduce the impact force caused by the rock blocks falling or even collapsing in the cavern by the coordination between the rubber particles, but also disperse the impact force more evenly to the outer wall of the pipeline, avoid stress concentration, and reduce damage to the pipeline. At the same time, when the energy storage pipeline expands or contracts during the filling and degassing process, the friction between the outer wall of the pipeline and the filling material is smaller, thereby reducing the damage of the coal gangue particles to the outer wall of the pipeline, especially for pipelines with anti-corrosion coatings on the outer wall, which helps to reduce the damage of the coating and increase the service life of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] Figure 1 This is a sample picture of graphitized coal gangue particles prepared in the following Example 1.

[0024] Figure 2 This is a sample picture of the filling material prepared in the following Example 1. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples without specifying specific conditions are usually carried out under conventional conditions or according to the conditions recommended by the manufacturer.

[0026] Unless otherwise defined, all professional and scientific terms used in the present invention have the same meanings as those familiar to those skilled in the art. The reagents or raw materials used in the present invention can be purchased through conventional channels. If there are no special instructions, the reagents or raw materials used in the present invention are used in a conventional manner in the art or in accordance with the product instructions. In addition, any method and material similar to or equivalent to the described content can be applied to the method of the present invention. Now, the technical solution of the present invention is further described in conjunction with the accompanying drawings and specific embodiments of the specification.

[0027] Example 1 The preparation process of the energy-absorbing and wear-reducing filling material of the buried pipe abandoned mine compressed gas energy storage system comprises the following steps: (1) Place the coal gangue block (organic matter content of 18.26wt.%) in a heating furnace and heat it to 2000℃ at a heating rate of 20℃ / min in a nitrogen atmosphere, and then keep it warm for 6 hours. After completion, continue to cool to room temperature in a nitrogen atmosphere, crush the product and sieve it to obtain graphitized coal gangue particles with a particle size distribution between 8 and 15 mm, such as Figure 1 shown.

[0028] (2) Sodium stearate is added to hot water at 80°C and stirred until the sodium stearate is fully dissolved to form a saturated liquid, and then 600-mesh graphite powder is added at a ratio of 7.5 g / L and stirred evenly. Then, the graphitized coal gangue particles are added to the obtained liquid phase (solid-liquid ratio = 1 g: 40 ml), and ultrasonic treatment is performed for 60 minutes (ultrasonic power is 200 W). During the above process, the system temperature is maintained at not less than 80°C. After completion, the reaction system is heated to 110°C and kept warm to evaporate the water therein to obtain pretreated coal gangue particles.

[0029] (3) The pretreated gangue particles were mixed with tetraethoxysilane at a ratio of 1 g:7 ml and then ultrasonically treated for 30 min (ultrasonic power of 250 W), and then the pretreated gangue particles were separated, mixed with saturated lime water at a ratio of 1 g:45 ml, and then heated to 55° C. and kept warm for 10 hours. After completion, the particles were filtered out and air-dried for 24 hours to obtain self-lubricating and anti-friction gangue particles.

[0030] (4) The self-lubricating and anti-friction coal gangue particles and the particles made of waste rubber with a particle size distribution between 2 and 5 mm are mixed uniformly in a mass ratio of 3.6:1 to obtain a filling material, such as Figure 2 shown.

[0031] Performance test: (1) According to the "Standard for Quality and Inspection Methods of Sand and Stone for Ordinary Concrete" (JGJ52-2006), the crushing value of the self-lubricating and anti-friction coal gangue particles prepared in this embodiment is tested to measure their compressive strength. (2) The self-lubricating and anti-friction coal gangue particles prepared in this embodiment are loaded into a container and compacted to form a flat upper surface, which is higher than the container. Then a steel plate is placed on the upper surface, and a weight is placed on the steel plate to apply a normal pressure. The normal pressure applied by the steel plate and the weight is recorded as G. Then a tensile gauge is used to pull the steel plate horizontally to move with the weight, and the pulling force F at this time is recorded. Then the friction coefficient μ1=F / G is calculated to measure the anti-friction ability of the self-lubricating and anti-friction coal gangue particles. (3) The self-lubricating and anti-friction coal gangue particles prepared in this embodiment are crushed and passed through a sieve with a pore size of 5 mm, and then the friction coefficient μ2 of the particles obtained is tested using the above method to measure the anti-friction ability of the self-lubricating and anti-friction coal gangue particles after they are broken. The above test results are shown in the following table: .

[0032] Example 2 The preparation process of the energy-absorbing and wear-reducing filling material of the buried pipe abandoned mine compressed gas energy storage system comprises the following steps: (1) Place the coal gangue block (organic matter content of 15.07 wt.%) in a heating furnace and heat it to 1600°C at a heating rate of 20°C / min in a nitrogen atmosphere, and then keep it at this temperature for 5 hours. After completion, continue to cool to room temperature in a nitrogen atmosphere, crush the product and sieve it to obtain graphitized coal gangue particles with a particle size distribution between 10 and 20 mm.

[0033] (2) Sodium stearate is added to hot water at 90°C and stirred until the sodium stearate is fully dissolved to form a saturated liquid, and then 800-mesh graphite powder is added at a ratio of 7g / L and stirred evenly. Then the graphitized coal gangue particles are added to the obtained liquid phase (solid-liquid ratio of the two = 1g:50ml), ultrasonically treated for 55 minutes (ultrasonic power of 300W), and then allowed to stand for 20 minutes. During the above process, the system temperature is kept not lower than 90°C. After completion, the reaction system is heated to 130°C and kept warm to evaporate the water therein to obtain pretreated coal gangue particles.

[0034] (3) The pretreated gangue particles were mixed with tetraethoxysilane at a ratio of 1 g:10 ml, and then ultrasonically treated for 40 min (ultrasonic power of 200 W). The pretreated gangue particles were separated, mixed with saturated lime water at a ratio of 1 g:50 ml, and then heated to 60° C. for 8 hours. After completion, the particles were filtered out and air-dried for 24 hours to obtain self-lubricating and anti-friction gangue particles.

[0035] (4) The self-lubricating and anti-friction coal gangue particles and the particles made of waste rubber with a particle size distribution between 2 and 5 mm are uniformly mixed in a mass ratio of 4:1 to obtain a filling material.

[0036] Performance test: The crushing value, friction coefficient μ1 and friction coefficient μ2 of the self-lubricating and anti-friction coal gangue particles prepared in this embodiment were tested by the same method as in the above embodiment 1. The above test results are shown in the following table: .

[0037] Example 3 The preparation process of the energy-absorbing and wear-reducing filling material of the buried pipe abandoned mine compressed gas energy storage system comprises the following steps: (1) Place the coal gangue block (organic matter content of 21.19 wt.%) in a heating furnace and heat it to 1850°C at a heating rate of 20°C / min in a nitrogen atmosphere, and then keep it at this temperature for 7 hours. After completion, continue to cool to room temperature in a nitrogen atmosphere, crush the product and sieve it to obtain graphitized coal gangue particles with a particle size distribution between 8 and 15 mm.

[0038] (2) Sodium stearate is added to hot water at 60°C and stirred until the sodium stearate is fully dissolved to form a saturated liquid, and then 500-mesh graphite powder is added at a ratio of 10g / L and stirred evenly. Then the graphitized coal gangue particles are added to the obtained liquid phase (solid-liquid ratio = 1g:30ml), and ultrasonic treatment is performed for 40 minutes (ultrasonic power is 300W). During the above process, the system temperature is maintained at not less than 60°C. After completion, the reaction system is heated to 90°C and kept warm to evaporate the water therein to obtain pretreated coal gangue particles.

[0039] (3) The pretreated gangue particles were mixed with tetraethoxysilane at a ratio of 1 g:5 ml and then ultrasonically treated for 35 min (ultrasonic power of 300 W), and then the pretreated gangue particles were separated, mixed with saturated lime water at a ratio of 1 g:40 ml, and then heated to 45° C. and kept warm for 12 hours. After completion, the particles were filtered out and air-dried for 20 hours to obtain self-lubricating and anti-friction gangue particles.

[0040] (4) The self-lubricating and anti-friction coal gangue particles and the particles made of waste rubber with a particle size distribution between 2 and 5 mm are uniformly mixed in a mass ratio of 3.2:1 to obtain a filling material.

[0041] Performance test: The crushing value, friction coefficient μ1 and friction coefficient μ2 of the self-lubricating and anti-friction coal gangue particles prepared in this embodiment were tested by the same method as in the above embodiment 1. The above test results are shown in the following table: .

[0042] Example 4 The preparation process of the energy-absorbing and wear-reducing filling material of the buried pipe abandoned mine compressed gas energy storage system comprises the following steps: (1) Sodium stearate is added to 80°C hot water and stirred until the sodium stearate is fully dissolved to form a saturated liquid, and then 600-mesh graphite powder is added at a ratio of 7.5g / L and stirred evenly. Then, coal gangue particles (organic matter content of 18.26wt.%) with a particle size distribution between 8 and 15mm are added to the obtained liquid phase at a solid-liquid ratio of 1g:40ml, and ultrasonic treatment is performed for 60 minutes (ultrasonic power of 200W). During the above process, the system temperature is maintained at not less than 80°C. After completion, the reaction system is heated to 110°C and kept warm to evaporate the water therein to obtain pretreated coal gangue particles.

[0043] (2) The pretreated gangue particles were mixed with tetraethoxysilane at a ratio of 1 g:7 ml and then ultrasonically treated for 30 min (ultrasonic power of 250 W), and then the pretreated gangue particles were separated, mixed with saturated lime water at a ratio of 1 g:45 ml, and then heated to 55° C. and kept warm for 10 hours. After completion, the particles were filtered out and air-dried for 24 hours to obtain self-lubricating and anti-friction gangue particles.

[0044] (3) The self-lubricating and anti-friction coal gangue particles and the particles made of waste rubber with a particle size distribution between 2 and 5 mm are uniformly mixed in a mass ratio of 3.6:1 to obtain a filling material.

[0045] Performance test: The crushing value, friction coefficient μ1 and friction coefficient μ2 of the self-lubricating and anti-friction coal gangue particles prepared in this embodiment were tested by the same method as in the above embodiment 1. The above test results are shown in the following table: .

[0046] Example 5 The preparation process of the energy-absorbing and wear-reducing filling material of the buried pipe abandoned mine compressed gas energy storage system comprises the following steps: (1) Place the coal gangue block (organic matter content of 21.19 wt.%) in a heating furnace and heat it to 1850°C at a heating rate of 20°C / min in a nitrogen atmosphere, and then keep it at this temperature for 7 hours. After completion, continue to cool to room temperature in a nitrogen atmosphere, crush the product and sieve it to obtain graphitized coal gangue particles with a particle size distribution between 8 and 15 mm.

[0047] (2) Add 500-mesh graphite powder to 60°C hot water at a ratio of 10 g / L and stir evenly. Then add the graphitized coal gangue particles to the obtained liquid phase (solid-liquid ratio = 1 g: 30 ml), and ultrasonically treat for 40 minutes (ultrasonic power of 300 W). During the above process, the system temperature is kept not lower than 60°C. After completion, the reaction system is heated to 90°C and kept warm to evaporate the water therein to obtain pretreated coal gangue particles.

[0048] (3) The pretreated gangue particles were mixed with tetraethoxysilane at a ratio of 1 g:5 ml and then ultrasonically treated for 35 min (ultrasonic power of 300 W), and then the pretreated gangue particles were separated, mixed with saturated lime water at a ratio of 1 g:40 ml, and then heated to 45° C. and kept warm for 12 hours. After completion, the particles were filtered out and air-dried for 20 hours to obtain self-lubricating and anti-friction gangue particles.

[0049] (4) The self-lubricating and anti-friction coal gangue particles and the particles made of waste rubber with a particle size distribution between 2 and 5 mm are uniformly mixed in a mass ratio of 3.2:1 to obtain a filling material.

[0050] Performance test: The crushing value, friction coefficient μ1 and friction coefficient μ2 of the self-lubricating and anti-friction coal gangue particles prepared in this embodiment were tested by the same method as in the above embodiment 1. The above test results are shown in the following table: .

[0051] Example 6 The preparation process of the energy-absorbing and wear-reducing filling material of the buried pipe abandoned mine compressed gas energy storage system comprises the following steps: (1) Place the coal gangue block (organic matter content of 15.07 wt.%) in a heating furnace and heat it to 1600°C at a heating rate of 20°C / min in a nitrogen atmosphere, and then keep it at this temperature for 5 hours. After completion, continue to cool to room temperature in a nitrogen atmosphere, crush the product and sieve it to obtain graphitized coal gangue particles with a particle size distribution between 10 and 20 mm.

[0052] (2) Sodium stearate is added to hot water at 90°C and stirred until the sodium stearate is fully dissolved to form a saturated liquid, and then 800-mesh graphite powder is added at a ratio of 7g / L and stirred evenly. Then the graphitized coal gangue particles are added to the obtained liquid phase (solid-liquid ratio of the two = 1g:50ml), ultrasonically treated for 55 minutes (ultrasonic power of 300W), and then allowed to stand for 20 minutes. During the above process, the system temperature is kept not lower than 90°C. After completion, the reaction system is heated to 130°C and kept warm to evaporate the water therein to obtain pretreated coal gangue particles.

[0053] (3) The pretreated gangue particles were mixed with tetraethoxysilane at a ratio of 1 g:10 ml, and then ultrasonically treated for 40 min (ultrasonic power of 200 W). The pretreated gangue particles were separated, mixed with clean water at a ratio of 1 g:50 ml, and then heated to 60° C. for 8 hours. After completion, the particles were filtered out and air-dried for 24 hours to obtain self-lubricating and anti-friction gangue particles.

[0054] (4) The self-lubricating and anti-friction coal gangue particles and the particles made of waste rubber with a particle size distribution between 2 and 5 mm are uniformly mixed in a mass ratio of 4:1 to obtain a filling material.

[0055] Performance test: The crushing value, friction coefficient μ1 and friction coefficient μ2 of the self-lubricating and anti-friction coal gangue particles prepared in this embodiment were tested by the same method as in the above embodiment 1. The above test results are shown in the following table: .

[0056] Example 7 The preparation process of the energy-absorbing and wear-reducing filling material of the buried pipe abandoned mine compressed gas energy storage system comprises the following steps: (1) Place the coal gangue block (organic matter content of 18.26wt.%) in a heating furnace and heat it to 2000℃ at a heating rate of 20℃ / min in a nitrogen atmosphere, and then keep it at this temperature for 6 hours. After completion, continue to cool to room temperature in a nitrogen atmosphere, crush the product and sieve it to obtain graphitized coal gangue particles with a particle size distribution between 8 and 15 mm.

[0057] (2) Sodium stearate is added to 80°C hot water and stirred until the sodium stearate is fully dissolved to form a saturated liquid. Then the graphitized coal gangue particles are added to the saturated liquid (solid-to-liquid ratio = 1g:40ml), and ultrasonic treatment is performed for 60 minutes (ultrasonic power is 200W). During the above process, the system temperature is maintained at not less than 80°C. After completion, the reaction system is heated to 110°C and kept warm to evaporate the water therein to obtain pretreated coal gangue particles.

[0058] (3) The pretreated gangue particles were mixed with tetraethoxysilane at a ratio of 1 g:7 ml and then ultrasonically treated for 30 min (ultrasonic power of 250 W), and then the pretreated gangue particles were separated, mixed with saturated lime water at a ratio of 1 g:45 ml, and then heated to 55° C. and kept warm for 10 hours. After completion, the particles were filtered out and air-dried for 24 hours to obtain self-lubricating and anti-friction gangue particles.

[0059] (4) The self-lubricating and anti-friction coal gangue particles and the particles made of waste rubber with a particle size distribution between 2 and 5 mm are uniformly mixed in a mass ratio of 3.6:1 to obtain a filling material.

[0060] Performance test: The crushing value, friction coefficient μ1 and friction coefficient μ2 of the self-lubricating and anti-friction coal gangue particles prepared in this embodiment were tested by the same method as in the above embodiment 1. The above test results are shown in the following table: .

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A preparation process for energy-absorbing and wear-reducing filling materials for buried pipe abandoned mine compressed gas energy storage system, characterized in that: The steps include: (1) graphitizing the coal gangue in an atmosphere isolated from air to graphitize the organic matter therein, cooling it to room temperature after completion, and crushing it to obtain graphitized coal gangue particles for later use; (2) adding sodium stearate and graphite powder to hot water and stirring until the sodium stearate is fully dissolved, and then adding the graphitized coal gangue particles to the obtained liquid phase for ultrasonic treatment; after completion, evaporating the water in the reaction system to obtain pretreated coal gangue particles for standby use; (3) mixing the pretreated gangue particles with tetraethoxysilane and subjecting them to ultrasonic treatment, separating the particles and placing them in saturated lime water for heating and heat preservation, separating the particles and drying them after completion, thereby obtaining self-lubricating and anti-friction gangue particles; (4) The self-lubricating and anti-friction coal gangue particles and rubber particles are mixed evenly to obtain the filling material.

2. The preparation process of the energy-absorbing and wear-reducing filling material for the buried pipe abandoned mine compressed gas energy storage system according to claim 1 is characterized in that: In step (1), the particle size of the coal gangue particles is distributed between 8 and 20 mm; preferably, the content of organic matter in the coal gangue is not less than 15%.

3. The preparation process of the energy-absorbing and wear-reducing filling material for the buried pipe abandoned mine compressed gas energy storage system according to claim 1 is characterized in that: In step (1), the graphitization temperature is 1850-2000° C., and the time is 5-7 hours; optionally, the atmosphere includes any one of nitrogen and argon.

4. The preparation process of the energy-absorbing and wear-reducing filling material for the buried pipe abandoned mine compressed gas energy storage system according to claim 1 is characterized in that: In step (2), the temperature of the hot water is 60-90°C; Optionally, in step (2), the sodium stearate in the liquid phase is in a saturated state, and the content of the graphite powder is 7-10 g / L; Optionally, in step (2), the fineness of the graphite powder is 500-800 mesh.

5. The preparation process of the energy-absorbing and wear-reducing filling material for the buried pipe abandoned mine compressed gas energy storage system according to claim 1, characterized in that: In step (2), the solid-liquid ratio of the graphitized coal gangue particles to the liquid phase is 1 g: 30-50 ml.

6. The preparation process of the energy-absorbing and wear-reducing filling material for the buried pipe abandoned mine compressed gas energy storage system according to claim 1, characterized in that: In step (2), the ultrasonic treatment time is 40-60 min, and the ultrasonic power is 200-300 W; optionally, in step (2), the evaporation temperature is 100-130° C.

7. The preparation process of the energy-absorbing and wear-reducing filling material for the buried pipe abandoned mine compressed gas energy storage system according to claim 1, characterized in that: In step (3), the solid-liquid ratio of the pretreated gangue particles to tetraethoxysilane is 1 g: 5-10 ml; Optionally, in step (3), the ultrasonic treatment time is 30-40 min, and the ultrasonic power is 200-300 W.

8. The preparation process of the energy-absorbing and wear-reducing filling material for the buried pipe abandoned mine compressed gas energy storage system according to claim 1, characterized in that: In step (3), the solid-liquid ratio of the pretreated gangue particles to saturated lime water is 1 g: 40-50 ml.

9. The preparation process of the energy-absorbing and wear-reducing filling material for the buried pipe abandoned mine compressed gas energy storage system according to claim 1, characterized in that: In step (3), the heating temperature is 45-60° C. and the insulation time is 8-12 hours.

10. The process for preparing the energy-absorbing and wear-reducing filling material for the buried pipe abandoned mine compressed gas energy storage system according to any one of claims 1 to 9, characterized in that: In step (4), the mass ratio of the self-lubricating and anti-friction coal gangue particles to the rubber particles is 3.2-4:1; optionally, in step (4), the particle size distribution of the rubber particles is between 2-5 mm.

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