A multifunctional injection system and method for dry ice cold storage ultra-high water material for mining

Abstract

The present invention relates to the technical field of coal mine cooling and fire prevention and extinguishing, and in particular, provides a multifunctional injection system and method for dry ice cold storage ultra-high water material for mines. The system includes an above-ground cloud platform, an underground ring network, a wired communication module, a liquid carbon dioxide storage tank, an electric valve 1, a dry ice preparation machine, an electric valve 2, a dry ice container, an electric valve 3, a cement container, an electric valve 4, a fly ash container, an electric valve 5, a lime container, an electric valve 6, a water container, an electric valve 7, a mixer, an electric valve 8, a grouting machine, an electric valve 9, a flow meter, a multi-layer composite segmented grouting pipe, and a drilling rig. While constructing an injection system in the mine, the system realizes the real-time preparation of dry ice cold storage ultra-high water material, controls the high temperature heat damage of the coal mine, prevents the occurrence of mine fires, improves the stability and strength of the coal seam through the multi-layer composite segmented grouting pipe, and ensures the safety of operators while improving work efficiency.

Description

[Technical field]

[0001] The invention relates to the technical field of coal mine cooling and fire prevention and extinguishing, and in particular to a multifunctional perfusion system and method for a mine-used dry ice cold storage ultra-high water material. [Background technology]

[0002] In recent years, my country's coal mining has shifted to deep strata. However, the geological structure of coal seams has become increasingly complex, and the temperature of surrounding rocks has gradually increased. At the same time, mine thermal dynamic disasters such as coal spontaneous combustion and gas explosions have also occurred frequently, reducing the work efficiency of operators and posing a serious threat to the safety of operators. In order to control the high-temperature heat damage of coal mines and prevent the occurrence of mine fires, fire-fighting materials such as high-water colloids and liquid carbon dioxide can be used. Among them, high-water colloids can enter the high-temperature zone and use water to absorb heat and vaporize to cool down, but for the area where the fire source is located with a small thermal conductivity and high specific heat capacity, its cooling effect is not good; although liquid carbon dioxide can quickly vaporize and absorb heat and reduce oxygen concentration, it is easy to dissipate after vaporization, which can easily cause the fire source to heat up again. How to improve the cooling and fire-fighting effect of these materials has become one of the current difficult problems in the field of fire prevention and extinguishing. Phase change cold storage material is a material that uses the endothermic effect of phase change to store and apply energy. It can control temperature and reduce energy consumption. Dry ice can solidify a large amount of gas and has a high phase change cold storage capacity, so it has potential application value in cooling and fire extinguishing. However, there are a series of problems when directly transporting dry ice to the mine, such as long pipelines and high costs, and the gas volume expands too quickly after sublimation, which can easily cause harm to operators. Therefore, it is particularly important to design a system that can prepare cooling and fire extinguishing materials in real time in mines and find a suitable carrier material to give full play to the advantages of dry ice materials.

[0003] Grouting anchors are mainly used for rock support in mining projects. With the continuous development of technology, the design and construction methods of grouting anchors are also constantly improving. In the background technology of grouting anchors, the selection of grouting materials is crucial. Commonly used grouting materials include cement slurry, polymer slurry and epoxy resin. Different grouting materials have different characteristics and scope of application, and suitable grouting materials can be selected according to specific engineering needs. The design of grouting anchors needs to consider factors such as the mechanical properties of soil or rock, engineering requirements and construction conditions. During the construction process, operations such as drilling, grouting and anchor installation are required to ensure that the grouting material can fully fill the borehole and form a firm bond with the surrounding soil or rock. In short, grouting anchors can effectively enhance the stability and bearing capacity of soil or rock through the injection and curing of grouting materials. This filling body is generally used in coal mine goafs. In the prior art, patent document CN113735500B discloses a filling particle, which includes aggregate and alkaline solid waste, is prepared by chemical foaming method, and has micropores, mesopores and macropores on the surface. The aggregate is a mixture of fly ash and mineralized calcium carbide slag, and the alkaline solid waste is a mixture of water glass and sodium hydroxide, and includes at least one oleic acid, hexadecyltrimethylammonium bromide surfactant and sodium hypochlorite foaming agent. Although the particle has a porous spherical shape and is composed of multiple substances, there are certain limitations in using the filling particle to cool the goaf.

[0004] In addition, patent document CN114562313B discloses a coal mine tunnel grouting anchor rod, which is composed of a hollow rod body, a drill bit, and upper and lower connecting plates. Among them, the diameter of the drill bit is larger than the diameter of the rod body, and a lower connecting plate and an upper connecting plate at a certain distance are fixed on the outer wall near one end of the drill bit, and multiple blades are distributed between the two, and a discharge hole that penetrates the interior is provided on the outer wall of the rod body. The anchor rod can prevent cement slurry from hindering the process of the drill bit drilling into the rock formation, and stop drilling after drilling and grouting in the hole through fluid. However, the scope of application of the anchor rod is limited, and it cannot be conveniently used when the width of the supporting coal pillar is larger than the width of the tunnel. [Summary of the invention]

[0005] In view of this, the present invention provides a multifunctional injection system and method for dry ice cold storage and ultra-high water material for mining, which is used to prepare cooling and fire extinguishing materials in real time while constructing a injection system underground in the mine, thereby effectively controlling high-temperature heat damage in coal mines, preventing the occurrence of mine fires, improving the stability and strength of coal seams, and ensuring the safety of operators while improving work efficiency.

[0006] In the first aspect, the present invention provides a multifunctional injection system for dry ice cold storage ultra-high water material for mining, the system comprising an above-ground cloud platform, an underground ring network, a wired communication module, a liquid carbon dioxide storage tank, an electric valve 1, a dry ice preparation machine, an electric valve 2, a dry ice container, an electric valve 3, a cement container, an electric valve 4, a fly ash container, an electric valve 5, a lime container, an electric valve 6, a water container, an electric valve 7, a mixer, an electric valve 8, a grouting machine, an electric valve 9, a flow meter, a multi-layer composite segmented grouting pipe, and a drilling rig;

[0007] The above-ground cloud platform is connected via an underground ring network and a wired communication module; the electric valve one, electric valve two, electric valve three, electric valve four, electric valve five, electric valve six, electric valve seven, electric valve eight and electric valve nine are controlled via a wired communication module; the liquid carbon dioxide storage tank is connected to the dry ice preparation machine via a rubber tube; the mixer is connected to the grouting machine via a rubber tube; an electric valve nine and a flow meter are provided at the outlet of the grouting machine, and the flow meter is used to detect and calculate the slurry output per unit time; during grouting, the grouting machine connects the front end of the rubber tube at the outlet with the rear end of the multi-layer composite segmented grouting pipe, opens the flow meter, electric valve eight and electric valve nine during grouting, and grouting is injected into the goaf through the multi-layer composite segmented grouting pipe.

[0008] Optionally, the multi-layer composite segmented grouting pipe includes a tail segmented pipe, a middle segmented pipe and a front segmented pipe; the multi-layer composite segmented grouting pipe is formed by mosaicking multiple-stage segmented pipes, and different numbers of segmented pipes can be used to extend the length as needed, wherein the number of the tail segmented pipe and the front segmented pipe are both one, and the different numbers of segmented pipes are middle segmented pipes.

[0009] Optionally, the tail segment pipe includes a tail integrated signal transmission section, a tray, and a slurry stop plug, and the tray is installed at the rear end position of the slurry stop plug.

[0010] Optionally, the tail integrated signal transmission segment includes a microcontroller / processor, a storage module, a power supply module, a LORA sending module, and a LORA wireless transmission antenna; wherein the microcontroller is a ZYNQ7020 chip, which includes a dual-core ARMCortex-A9 processor and an FPGA-A7 chip; the power supply module is a lithium-ion battery (Li-ion), a lithium polymer battery (Li-Po) or a carbon-zinc battery (Zinc-Carbon); the model of the LORA sending module is ATK-LORA-01, and its transmission distance is greater than 1000M; the model of the LORA wireless transmission antenna is Zigbee, LoRaWAN or NB-loT.

[0011] Optionally, the middle segmented pipe includes a front interface and a rear interface for adjusting the length and quantity of the pipe; the middle segmented pipe has a layered structure, which is composed of three layers of an anchor layer, a rubber layer and a protective layer; when the diameter of the grouting rod is 30 mm, the diameters of the anchor layer, the protective layer and the rubber layer are 5 mm, 5 mm and 10 mm respectively;

[0012] The preparation steps of the protective layer are as follows: mixing a foam, an anti-aging agent and a plasticizer, extruding the mixture after uniform mixing and blow-molding it into a tube, and rapidly cooling and shaping it to form a protective layer, and then covering the outer layer of the rubber layer; wherein the foam is polystyrene, polyvinyl chloride, polyethylene or polyurethane; the anti-aging agent is UV-531, UV-326, UV-741 or JW-791; and the plasticizer is dioctyl oxalate, dioctyl sebacate or dioctyl terephthalate.

[0013] Optionally, the front segmented pipe includes a first slurry outlet, a connecting segment and a drill bit;

[0014] The first slurry outlet is a through hole; the connecting section includes a detection hole and a line connection hole, and the detection holes are two holes symmetrically arranged along the axis; the line connection hole is used to connect a temperature sensor and an oxygen concentration sensor; the temperature sensor and the oxygen concentration sensor are respectively connected to a microcontroller / processor;

[0015] The drill bit comprises a material outlet trough and a second slurry outlet, the diameter of which is larger than the diameter of each stage of the segmented pipe; the diameter of the second slurry outlet is equal to the diameter of the rubber layer.

[0016] Optionally, the wired communication module uses RS485 protocol for communication.

[0017] In a second aspect, the present invention provides a multifunctional perfusion method for dry ice cold storage ultra-high water material for mining, the method is implemented based on a multifunctional perfusion system, and the method comprises the following steps:

[0018] Step S1, open the electric valve 1, use the liquid carbon dioxide in the liquid carbon dioxide storage tank to prepare dry ice into small cylindrical dry ice particles by cooling, compressing and cutting under the conditions of low temperature and high pressure of the dry ice preparation machine;

[0019] Open electric valve 2, transfer dry ice particles into the dry ice container, add retarder and antifreeze into the water container, and then open electric valve 3, electric valve 4, electric valve 5, electric valve 6, and electric valve 7 in sequence;

[0020] Add dry ice, cement, fly ash, lime, and water containing a retarder and an antifreeze agent into a mixer and stir to generate a dry ice cooling super-high water material, and take out a small portion of the sample and put it into two test molds respectively, monitor the temperature of one test mold through a multi-channel temperature tester, and put the other assembled test mold into a curing box for curing, and after curing, take out the solidified dry ice cooling super-high water material from the test mold and conduct testing to observe its chemical structure;

[0021] Step S2, completing the preparation of the dry ice cold storage ultra-high water material in step S1 to obtain the dry ice cold storage ultra-high water material; measuring the thickness of the supporting coal pillar to determine the number of middle segmented pipes of the multi-layer composite segmented grouting pipe;

[0022] The drilling rig drills holes for the front section pipe of the multi-layer composite segmented grouting pipe, and after drilling to a suitable position, connects the middle section pipe and the front section pipe through the front interface and the rear interface;

[0023] The drilling rig drills holes in the middle segment pipe and pushes it forward in sequence. After reaching the appropriate position, the tail segment pipe of the multi-layer composite segmented grouting pipe is drilled and installed. After reaching the final position, the tail integrated signal output section is installed.

[0024] Step S3, after the installation of the multi-layer composite segmented grouting pipe is completed in step S2, the drilling machine is moved to the pre-drilling position, the grouting machine is connected to the multi-layer composite segmented grouting pipe, and the tray and the grouting stopper are installed;

[0025] Open electric valve eight and electric valve nine, inject the dry ice cold storage ultra-high water material in step S1 into the goaf through the multi-layer composite segmented grouting pipe, monitor the goaf in real time, transmit the monitoring data to the well cloud platform, and turn on the flow meter to detect and calculate the slurry output per unit time.

[0026] Optionally, the dry ice cold storage ultra-high water material is formed by mechanically stirring dry ice, cement, fly ash, lime, and water containing a retarder and an antifreeze agent; the dry ice is made of liquid carbon dioxide and is characterized by a small cylindrical shape with a particle size of 3 mm; the cement is PO42.5 ordinary Portland cement; the fly ash is primary fly ash with a particle size in the range of 0.1 mm-150 mm; the retarder includes sodium tripolyphosphate and / or glycerol; the antifreeze includes calcium chloride, calcium nitrite or ethylene glycol; the mechanical stirring speed ranges from 300 r / min to 600 r / min, and the temperature is room temperature.

[0027] In the technical solution provided by the present invention, the system includes an above-ground cloud platform, an underground ring network, a wired communication module, a liquid carbon dioxide storage tank, an electric valve one, a dry ice preparation machine, an electric valve two, a dry ice container, an electric valve three, a cement container, an electric valve four, a fly ash container, an electric valve five, a lime container, an electric valve six, a water container, an electric valve seven, a mixer, an electric valve eight, a grouting machine, an electric valve nine, a flow meter, a multi-layer composite segmented grouting pipe, and a drilling rig. While constructing a perfusion system in the mine, the system realizes real-time preparation of dry ice cold storage and ultra-high water materials, effectively controls high-temperature heat damage in coal mines, prevents the occurrence of mine fires, improves the stability and strength of the coal seam through the multi-layer composite segmented grouting pipe, and ensures the safety of operators while improving work efficiency.

Brief Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 An overall diagram of a multifunctional perfusion system provided by an embodiment of the present invention;

[0030] Figure 2 A front view of the overall structure of a grouting pipe provided by an embodiment of the present invention;

[0031] Figure 3 A front view of a tail segmented tube provided by an embodiment of the present invention;

[0032] Figure 4 A schematic diagram of a tail integrated signal transmission section provided by an embodiment of the present invention;

[0033] Figure 5 A front view of a middle segmented pipe provided by an embodiment of the present invention;

[0034] Figure 6 A side view of a middle segmented pipe provided by an embodiment of the present invention;

[0035] Figure 7 A front view of a front segmented tube provided by an embodiment of the present invention;

[0036] Figure 8 A front view of a connecting section provided by an embodiment of the present invention;

[0037] Fig. 9 A side view of a drill bit provided by an embodiment of the present invention;

[0038] Fig.10A flowchart of a multifunctional perfusion method provided by an embodiment of the present invention;

[0039] Fig.11 A reaction mechanism diagram of the dry ice cold storage ultra-high water material provided in an embodiment of the present invention;

[0040] Fig.12 Temperature variation diagram of materials under different dry ice dosages provided by an embodiment of the present invention (a.0%; b.1%; c.3%; d.6%, where the percentage is the dry ice dosage percentage).

[0041] 1-anchor layer; 2-rubber layer; 3-protective layer; 4-integrated signal output section; 5-tray; 6-stop plug; 7-tail segmented pipe; 8-rear end interface; 9-middle segmented pipe; 10-front end interface; 11-front segmented pipe; 12-first slurry outlet; 13-connecting section; 14-drill bit; 15-discharge trough; 16-second slurry outlet; 17-detection hole; 18-line connection hole; 19-on-hole cloud platform; 20-downhole ring network; 21-wired communication module; 22-liquid carbon dioxide storage tank; 23-electric valve one; 24-dry ice preparation machine; 25-electric valve two; 26-dry ice container; 27-electric valve three; 28- Cement container; 29-electric valve four; 30-fly ash container; 31-electric valve five; 32-water container; 33-electric valve six; 34-lime container; 35-electric valve seven; 36-mixer; 37-electric valve eight; 38-grouting machine; 39-electric valve nine; 40-flow meter; 41-multi-layer composite segmented grouting pipe; 42-drilling rig; 43-pre-drilling; 44-goaf; 45-supporting coal pillar; 46-temperature sensor; 47-oxygen concentration sensor; 48-storage module; 49-microcontroller / processor; 50-power supply module; 51-LORA sending module; 52-LORA wireless transmission antenna. [Specific implementation method]

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be clear that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0045] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0046] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0047] Figure 1 The overall diagram of the multifunctional perfusion system provided by the embodiment of the present invention is as follows: Figure 1 As shown, the system includes: an above-ground cloud platform 19, an underground ring network 20, a wired communication module 21, a liquid carbon dioxide storage tank 22, an electric valve 1 23, a dry ice preparation machine 24, an electric valve 2 25, a dry ice container 26, an electric valve 3 27, a cement container 28, an electric valve 4 29, a fly ash container 30, an electric valve 5 31, a lime container 32, an electric valve 6 33, a water container 34, an electric valve 7 35, a mixer 36, an electric valve 8 37, a grouting machine 38, an electric valve 9 39, a flow meter 40, a multi-layer composite segmented grouting pipe 41, and a drilling rig 42.

[0048] The cloud platform 19 on the well is connected to the wired communication module 21 through the downhole ring network 20; the electric valve 1 23, the electric valve 25, the electric valve 3 27, the electric valve 4 29, the electric valve 5 31, the electric valve 6 33, the electric valve 7 35, the electric valve 8 37 and the electric valve 9 39 are controlled by the wired communication module 21; the liquid carbon dioxide storage tank 22 is connected to the dry ice preparation machine 24 through a rubber tube; the mixer 36 is connected to the grouting machine 38 through a rubber tube; the outlet of the grouting machine 38 is provided with an electric valve 9 39 and a flow meter 40, the flow meter 40 is used to detect and calculate the slurry output per unit time, and the flow meter 40 is controlled by wire; when grouting, the front end of the rubber tube at the outlet of the grouting machine 38 is connected to the tail end of the multi-layer composite segmented grouting pipe 41, and the flow meter 40, the electric valve 8 37 and the electric valve 9 39 are opened during grouting, and grouting is injected into the goaf 44 through the multi-layer composite segmented grouting pipe 41.

[0049] In the embodiment of the present invention, the wired communication module 21 uses the RS485 protocol for communication, and the wired communication module 21 can support a communication distance of up to 1000M, and can support multiple devices to work simultaneously online. The dry ice preparation machine 24 is a preparation machine that can prepare small cylindrical dry ice, the mixer 36 is a vertical mixer, and the drilling machine 42 is an anchor drilling machine.

[0050] Figure 2 The overall structure front view of the grouting pipe provided by the embodiment of the present invention is as follows: Figure 2 As shown, the multi-layer composite segmented grouting pipe 41 includes a tail segmented pipe 7, a middle segmented pipe 9 and a front segmented pipe 11; the multi-layer composite segmented grouting pipe 41 is formed by multi-stage segmented pipes being interlocked, and different numbers of segmented pipes can be used to extend the length as needed, wherein the number of the tail segmented pipe 7 and the front segmented pipe 11 are both one, and the different number of segmented pipes are the middle segmented pipe 9.

[0051] Figure 3 A front view of a tail segmented tube provided in an embodiment of the present invention, as shown in FIG. Figure 3 As shown, the tail segmented pipe 7 includes a tail integrated signal transmission section 4, a tray 5, and a slurry stop plug 6, and the tray 5 is installed at the rear end position of the slurry stop plug 6.

[0052] Figure 4 The schematic diagram of the tail integrated signal transmission section provided by the embodiment of the present invention is as follows: Figure 4As shown, the tail integrated signal transmission section 4 includes a microcontroller / processor 49, a storage module 48, a power supply module 50, a LORA sending module 51, and a LORA wireless transmission antenna 52; wherein the microcontroller 49 is a ZYNQ7020 chip, which includes a dual-core ARM Cortex-A9 processor and an FPGA-A7 chip; the power supply module 50 is a lithium-ion battery (Li-ion), a lithium polymer battery (Li-Po) or a carbon-zinc battery (Zinc-Carbon); the model of the LORA sending module 51 is ATK-LORA-01, and its transmission distance is greater than 1000M; the model of the LORA wireless transmission antenna 52 is Zigbee, LoRaWAN or NB-loT.

[0053] Figure 5 A front view of a middle section pipe provided by an embodiment of the present invention, as shown in FIG. Figure 5 As shown, the middle segment pipe 9 includes a front end interface 8 and a rear end interface 10 for adjusting the length and quantity of the pipeline.

[0054] Figure 6 A side view of a middle section pipe provided by an embodiment of the present invention, as shown in FIG. Figure 6 As shown, the middle segment pipe 9 has a layered structure, which is composed of three layers: an anchor layer 1, a rubber layer 2 and a protective layer 3. When the diameter of the grouting rod is 30 mm, the diameters of the anchor layer, the protective layer and the rubber layer are 5 mm, 5 mm and 10 mm respectively.

[0055] The preparation steps of the protective layer 3 are as follows: the foam, the anti-aging agent and the plasticizer are mixed, and after the mixing is uniform, the mixture is extruded and blown into a tube, and at the same time, the temperature is quickly cooled and shaped to form the protective layer 3, and the protective layer is put on the outer layer of the rubber layer 2; wherein the foam is polystyrene, polyvinyl chloride, polyethylene or polyurethane; the anti-aging agent is UV-531, UV-326, UV-741 or JW-791; the plasticizer is dioctyl oxalate, dioctyl sebacate or dioctyl terephthalate.

[0056] Figure 7 A front view of a front segmented tube provided by an embodiment of the present invention, as shown in FIG. Figure 7 As shown, the front segmented pipe 11 comprises a first slurry outlet 12, a connecting section 13 and a drill bit 14, and the first slurry outlet (12) is a through-opening.

[0057] Figure 8 A front view of a connecting section provided in an embodiment of the present invention, such as Figure 8 As shown, the connecting section 13 includes a detection hole 17 and a line connection hole 18. The detection hole 17 is two holes symmetrically arranged about the axis; the line connection hole 18 is used to connect the temperature sensor 46 and the oxygen concentration sensor 47; the temperature sensor 46 and the oxygen concentration sensor 47 are respectively connected to the microcontroller / processor 49.

[0058] Fig. 9 A side view of a drill bit provided by an embodiment of the present invention, as shown in FIG. Fig. 9 As shown, the drill bit 14 includes a discharge trough 15 and a second slurry outlet 16 , the diameter of which is larger than the diameter of each stage of the segmented pipe; the diameter of the second slurry outlet 16 is equal to the diameter of the rubber layer 2 .

[0059] In the embodiment of the present invention, the length and number of the multi-layer composite segmented grouting pipe can be flexibly adjusted through the design of the multi-layer composite segmented grouting pipe, so as to adapt to different grouting work requirements. At the same time, the integrated signal transmission section can realize data processing and transmission, and meet the precise control and monitoring requirements in complex working scenarios. In the design of the front segmented pipe, the structural optimization of the drill bit and the slurry outlet can improve the drilling efficiency, and the detection hole can realize the real-time monitoring of various parameters of the goaf during the grouting process.

[0060] Fig.10 A flowchart of a multifunctional perfusion method provided by an embodiment of the present invention, such as Fig.10 As shown, the method is implemented based on a multifunctional perfusion system, and the method includes the following steps:

[0061] Step S1, open the electric valve 1 23, use the liquid carbon dioxide in the liquid carbon dioxide storage tank 22 to prepare dry ice into small cylindrical dry ice particles by cooling, compressing and cutting under the conditions of low temperature and high pressure in the dry ice preparation machine 24;

[0062] Open the electric valve 25, transfer the dry ice particles into the dry ice container 26, add the retarder and antifreeze into the water container 34, and then open the electric valve 3 27, the electric valve 4 29, the electric valve 5 31, the electric valve 6 33, and the electric valve 7 35 in sequence;

[0063] Add dry ice, cement, fly ash, lime, and water containing a retarder and an antifreeze agent into a mixer 36 for stirring to generate a dry ice cooling super-high water material, and take out a small portion of the sample and put it into two test molds respectively, monitor the temperature of one test mold by a multi-channel temperature tester, and put the other assembled test mold into a curing box for curing, and after the curing is completed, take out the solidified dry ice cooling super-high water material from the test mold and perform testing to observe its chemical structure;

[0064] Step S2, completing the preparation of the dry ice cold storage ultra-high water material in step S1, and obtaining the dry ice cold storage ultra-high water material; measuring the thickness of the supporting coal pillar 45, and determining the number of the middle segment pipes 9 of the multi-layer composite segmented grouting pipe 41;

[0065] The drilling machine 42 drills and installs the front segment pipe 11 of the multi-layer composite segmented grouting pipe 41, and after drilling to a suitable position, connects the middle segment pipe 9 and the front segment pipe 11 through the front interface 10 and the rear interface 8;

[0066] The drilling machine 42 drills and installs the middle segment pipe 9 and pushes it forward in sequence. After reaching the appropriate position, the tail segment pipe 7 of the multi-layer composite segmented grouting pipe 41 is drilled and installed. After reaching the final position, the tail integrated signal output section 4 is installed.

[0067] Step S3, after the installation of the multi-layer composite segmented grouting pipe 41 is completed in step S2, the drilling machine moves to the pre-drilling position 43, the grouting machine 38 is connected to the multi-layer composite segmented grouting pipe 41, and the tray 5 and the grout stopper 6 are installed;

[0068] Open electric valve eight 37 and electric valve nine 39, and inject the dry ice cold storage ultra-high water material in step S1 into the goaf 44 through the multi-layer composite segmented grouting pipe 41, monitor the goaf 44 in real time, transmit the monitoring data to the well cloud platform 19, and at the same time turn on the flow meter 40 to detect and calculate the slurry output per unit time.

[0069] In the embodiment of the present invention, the coal pillar can be conveniently supported and solidified by the drilling rig grouting method. The use of a multi-layer composite segmented grouting pipe for drilling can effectively control the grouting process and ensure that the grouting material is fully mixed. The process of preparing dry ice cold storage ultra-high water material is simple and quick. The small cylindrical dry ice is prepared by liquid carbon dioxide, which can improve the grouting efficiency. The materials are added to the mixer in the required order for stirring, which can ensure the uniformity and stability of the grouting material. In addition, by opening valve eight and valve nine and grouting through the second slurry outlet, the grouting material can be fully injected into the borehole, and part of the grouting material is injected into the pores through the first slurry outlet and wrapped around the multi-layer composite segmented grouting pipe to achieve support and solidification of the coal pillar. This method is simple to operate and has reliable results, and is suitable for grouting operations in coal mines and other fields.

[0070] In an embodiment of the present invention, the dry ice cold storage ultra-high water material is formed by mechanically stirring dry ice, cement, fly ash, lime, and water containing a retarder and an antifreeze agent. The dry ice is made of liquid carbon dioxide and is characterized by a small cylindrical shape with a particle size of 3 mm; the cement is PO42.5 ordinary Portland cement; the fly ash is first-class fly ash, and its particle size is in the range of 0.1 mm-150 mm; the retarder includes sodium tripolyphosphate and / or glycerol; the antifreeze agent includes calcium chloride, calcium nitrite or ethylene glycol; the mechanical stirring speed ranges from 300 r / min to 600 r / min, and the temperature is room temperature, that is, indoor temperature, generally defined as 25 degrees Celsius.

[0071] In the embodiment of the present invention, the preparation reaction formula of the dry ice cold storage ultra-high water material includes the following steps:

[0072] Step 1: Dry ice phase change.

[0073]

[0074]

[0075]

[0076]

[0077] Step 2: hydration reaction.

[0078]

[0079]

[0080] When there is sufficient calcium sulfate in the water:

[0081]

[0082] When there is insufficient calcium sulfate in the water:

[0083]

[0084]

[0085] Step 3: Mineralization reaction.

[0086]

[0087]

[0088] In the embodiment of the present invention, the dry ice cold storage ultra-high water material has a good cooling effect. Pouring the dry ice cold storage ultra-high water material into the goaf can effectively reduce the temperature of the goaf and reduce the risk of coal seam fire. At the same time, the dry ice cold storage ultra-high water material also has the function of preventing fire and extinguishing, which can prevent the spread and expansion of the fire. After grouting, some materials enter the pores through the first slurry outlet and are wrapped around the multi-layer composite segmented grouting pipe. After solidification, they can be used to reinforce and support the coal seam, improve the stability and strength of the coal seam, which helps to prevent coal seam collapse and accidents and ensure the safety of miners. The multifunctional perfusion system can monitor the temperature and oxygen concentration in the goaf in real time, so that abnormal conditions can be discovered in time and corresponding measures can be taken to ensure the safety of the staff. The dry ice cold storage ultra-high water material is prepared in real time through a multifunctional perfusion method. At the same time, the prepared dry ice cold storage ultra-high water material is perfused in real time through the multi-layer composite segmented grouting pipe in the multifunctional perfusion system, which can reduce material waste and improve work efficiency. The multifunctional perfusion system can also realize automated operation, reduce manual intervention, and reduce labor costs.

[0089] In the technical solution provided by the present invention, the system includes an above-ground cloud platform, an underground ring network, a wired communication module, a liquid carbon dioxide storage tank, an electric valve one, a dry ice preparation machine, an electric valve two, a dry ice container, an electric valve three, a cement container, an electric valve four, a fly ash container, an electric valve five, a lime container, an electric valve six, a water container, an electric valve seven, a mixer, an electric valve eight, a grouting machine, an electric valve nine, a flow meter, a multi-layer composite segmented grouting pipe, and a drilling rig. While constructing a perfusion system in the mine, the system realizes real-time preparation of dry ice cold storage and ultra-high water materials, effectively controls high-temperature heat damage in coal mines, prevents the occurrence of mine fires, and can improve the stability and strength of the coal seam through the multi-layer composite segmented grouting pipe, and ensures the safety of operators while improving work efficiency.

[0090] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multifunctional perfusion system for dry ice cold storage and ultra-high water material for mining, characterized in that: The system comprises an above-ground cloud platform (19), an underground ring network (20), a wired communication module (21), a liquid carbon dioxide storage tank (22), an electric valve one (23), a dry ice preparation machine (24), an electric valve two (25), a dry ice container (26), an electric valve three (27), a cement container (28), an electric valve four (29), a fly ash container (30), an electric valve five (31), a lime container (32), an electric valve six (33), a water container (34), an electric valve seven (35), a mixer (36), an electric valve eight (37), a grouting machine (38), an electric valve nine (39), a flow meter (40), a multi-layer composite segmented grouting pipe (41), and a drilling rig (42); The above-ground cloud platform (19) is connected to the wired communication module (21) via the underground ring network (20); the electric valve 1 (23), the electric valve 2 (25), the electric valve 3 (27), the electric valve 4 (29), the electric valve 5 (31), the electric valve 6 (33), the electric valve 7 (35), the electric valve 8 (37) and the electric valve 9 (39) are controlled via the wired communication module (21); the liquid carbon dioxide storage tank (22) is connected to the dry ice preparation machine (24) via a rubber tube; the mixer (3 6) connected to a grouting machine (38) via a rubber tube; the outlet of the grouting machine (38) is provided with an electric valve nine (39) and a flow meter (40), the flow meter (40) being used to detect and calculate the grouting volume per unit time; during grouting, the front end of the rubber tube at the outlet of the grouting machine (38) is connected to the rear end of the multi-layer composite segmented grouting pipe (41); during grouting, the flow meter (40), the electric valve eight (37) and the electric valve nine (39) are opened, and grouting is performed into the goaf (44) through the multi-layer composite segmented grouting pipe (41); The multi-layer composite segmented grouting pipe (41) comprises a tail segmented pipe (7), a middle segmented pipe (9) and a front segmented pipe (11); the multi-layer composite segmented grouting pipe (41) is formed by a plurality of segmented pipes being joined together, and different numbers of segmented pipes can be used to extend the length as required, wherein the number of the tail segmented pipe (7) and the number of the front segmented pipe (11) are both one, and the different number of segmented pipes are the middle segmented pipes (9); The tail segmented pipe (7) comprises a tail integrated signal transmission section (4), a tray (5), and a slurry stopper (6), wherein the tray (5) is installed at the rear end of the slurry stopper (6).

2. The system according to claim 1, characterized in that The tail integrated signal transmission section (4) comprises a microcontroller / processor (49), a storage module (48), a power supply module (50), a LORA transmission module (51), and a LORA wireless transmission antenna (52); wherein the microcontroller (49) is a ZYNQ7020 chip, which comprises a dual-core ARM Cortex-A9 processor and an FPGA-A7 chip; the power supply module (50) is a lithium-ion battery (Li-ion), a lithium polymer battery (Li-Po) or a carbon-zinc battery (Zinc-Carbon); the model of the LORA transmission module (51) is ATK-LORA-01, and its transmission distance is greater than 1000M; the model of the LORA wireless transmission antenna (52) is Zigbee, LoRaWAN or NB-loT.

3. The system according to claim 1, characterized in that The middle segmented pipe (9) comprises a front end interface (8) and a rear end interface (10) for adjusting the length and quantity of the pipe; the middle segmented pipe (9) has a layered structure, and is composed of three layers, namely, an anchor layer (1), a rubber layer (2) and a protective layer (3), which are composited inside and outside; when the diameter of the grouting rod is 30 mm, the diameters of the anchor layer, the protective layer and the rubber layer are 5 mm, 5 mm and 10 mm respectively; The protective layer (3) is prepared in the following steps: mixing a foam, an anti-aging agent and a plasticizer, extruding the mixture after mixing evenly, and blow-molding the mixture into a tube, while rapidly cooling and shaping the mixture to form a protective layer (3), which is then sheathed on the outer layer of the rubber layer (2); wherein the foam is polystyrene, polyvinyl chloride, polyethylene or polyurethane; the anti-aging agent is UV-531, UV-326, UV-741 or JW-791; and the plasticizer is dioctyl oxalate, dioctyl sebacate or dioctyl terephthalate.

4. The system according to claim 2, characterized in that The front segmented pipe (11) comprises a first slurry outlet (12), a connecting section (13) and a drill bit (14); The first slurry outlet (12) is a through-hole; the connecting section (13) comprises a detection hole (17) and a circuit connection hole (18); the detection holes (17) are two holes symmetrically arranged about an axis; the circuit connection hole (18) is used to connect a temperature sensor (46) and an oxygen concentration sensor (47); the temperature sensor (46) and the oxygen concentration sensor (47) are respectively connected to a microcontroller / processor (49); The drill bit (14) comprises a discharge trough (15) and a second slurry outlet (16), the diameter of which is larger than the diameter of each stage of the segmented pipes; the diameter of the second slurry outlet (16) is equal to the diameter of the rubber layer (2).

5. The system according to claim 1, characterized in that The wired communication module (21) uses the RS485 protocol for communication.

6. A multifunctional pouring method for dry ice cold storage ultra-high water material for mining, characterized in that: The method is implemented based on the multifunctional injection system of dry ice cold storage ultra-high water material for mining according to claim 1, and the method comprises the following steps: Step S1, opening the electric valve 1 (23), using the liquid carbon dioxide in the liquid carbon dioxide storage tank (22), and preparing dry ice into small cylindrical dry ice particles by cooling, compressing and cutting under low temperature and high pressure conditions in a dry ice preparation machine (24); Open the electric valve 2 (25), transfer the dry ice particles into the dry ice container (26), add a retarder and an antifreeze agent into the water container (34), and then open the electric valve 3 (27), the electric valve 4 (29), the electric valve 5 (31), the electric valve 6 (33), and the electric valve 7 (35) in sequence; Add dry ice, cement, fly ash, lime, and water containing a retarder and an antifreeze agent into a mixer (36) for stirring to generate a dry ice cooling super-high water material, and take out a small portion of the sample and put it into two test molds respectively, monitor the temperature of one test mold by a multi-channel temperature tester, and put the other assembled test mold into a curing box for curing, and after the curing is completed, take out the solidified dry ice cooling super-high water material from the test mold and perform testing to observe its chemical structure; Step S2, completing the preparation of the dry ice cold storage ultra-high water content material in step S1 to obtain the dry ice cold storage ultra-high water content material; measuring the thickness of the supporting coal pillar (45) to determine the number of the middle segmented pipes (9) of the multi-layer composite segmented grouting pipe (41); The drilling machine (42) drills holes in the front segment pipe (11) of the multi-layer composite segmented grouting pipe (41) for installation, and after drilling to a suitable position, the middle segment pipe (9) and the front segment pipe (11) are connected via the front interface (10) and the rear interface (8); The drilling machine (42) drills holes in the middle segmented pipe (9) and pushes it forward in sequence. After reaching a suitable position, the tail segmented pipe (7) of the multi-layer composite segmented grouting pipe (41) is drilled and installed. After reaching the final position, the tail integrated signal output section (4) is installed. Step S3, after the installation of the multi-layer composite segmented grouting pipe (41) is completed in step S2, the drilling machine is moved to the pre-drilling (43) position, the grouting machine (38) is connected to the multi-layer composite segmented grouting pipe (41), and the tray (5) and the grouting stopper (6) are installed; Open the electric valve eight (37) and the electric valve nine (39), inject the dry ice cold storage ultra-high water material in step S1 into the goaf (44) through the multi-layer composite segmented grouting pipe (41), monitor the goaf (44) in real time, transmit the monitoring data to the well cloud platform (19), and simultaneously open the flow meter (40) to detect and calculate the slurry output per unit time.

7. The method according to claim 6, characterized in that The dry ice cold storage ultra-high water material is made by mechanically stirring dry ice, cement, fly ash, lime, and water containing a retarder and an antifreeze agent, and the dry ice is made of liquid carbon dioxide. It is characterized by a small cylindrical shape and a particle size of 3 mm; the cement is PO42.5 ordinary Portland cement; the fly ash is first-class fly ash, and its particle size is in the range of 0.1 mm - 150 mm; the retarder includes sodium tripolyphosphate and / or glycerol; the antifreeze includes calcium chloride, calcium nitrite or ethylene glycol; the mechanical stirring speed ranges from 300 r / min to 600 r / min, and the temperature is room temperature.

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