An overburden oxygen barrier to prevent spontaneous combustion of combustible rock and soil and method of use

Abstract

The application discloses an overlying oxygen isolation device for preventing combustible rock and soil from spontaneous combustion and a use method thereof. The device comprises a stockyard, a plurality of double-flow nitrogen conveying hoses arranged on the upper surface of the stockyard, a plurality of lifting arc supports fixedly installed on the upper surface of the stockyard and corresponding to the double-flow nitrogen conveying hoses, and a plurality of through grooves formed on the outer surface of the double-flow nitrogen conveying hoses and distributed along the axial direction of the double-flow nitrogen conveying hoses. The double-flow nitrogen conveying hoses, the nitrogen drying device and the nitrogen detection box are arranged, so that high-concentration nitrogen gas sequentially passes through the mixed gas buffer tank, the first connecting pipe, the air inlet pipe and the stable air pipe, enters the combustible rock and soil through the double-flow nitrogen conveying hoses, and the nitrogen drying device is used for separating the gas in the combustible rock and soil, so that the nitrogen gas rapidly enters the combustible rock and soil, the air in the combustible rock and soil is rapidly squeezed out by the nitrogen gas, the combustible rock and soil is isolated from the air, and the combustible rock and soil is prevented from spontaneous combustion.

Description

Technical Field

[0001] The present invention relates to the field of overlying oxygen isolation for preventing spontaneous combustion of combustible rock and soil, and in particular to an overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil and a method for using the device. Background Art

[0002] Generally speaking, spontaneous combustion of combustible rock and soil is caused by a combination of factors, including carbonization, volatility, moisture, oxidation caused by impurities, and oxygen adsorption. The carbonization, or degree of metamorphism, of the combustible rock and soil has a significant impact on spontaneous combustion. The lower the degree of metamorphism, the more likely it is to spontaneously combust.

[0003] Combustible rock and soil are increasingly in demand in power plants, steel mills, and other locations. Typically, large quantities of combustible rock and soil are piled up in storage yards in these locations, often in the open air, for periods of 30 to 60 days. During this storage process, large amounts of air enter the combustible rock and soil. Carbon-based active groups (hydroxyl groups, carbonyl groups, active hydrogen, etc.), sulfur, metal ions, and impurities in the rock and soil react with the oxygen in the air, generating heat that accumulates within the rock and soil. Over time, the temperature within the rock and soil gradually rises, accelerating the catalytic oxidation heat release. Eventually, the accumulated heat reaches the ignition point of the rock and soil, causing spontaneous combustion and fires. Furthermore, even before the ignition point is reached, oxygen in the air can cause surface oxidation of the rock and soil, deteriorating its quality and reducing its commercial and operational value.

[0004] Prior to the present invention, patents related to preventing the spontaneous combustion of combustible rock and soil mainly focused on developing inhibitors to prevent the spontaneous combustion of combustible rock and soil, or achieving flame retardancy by injecting inert gas. Patent Publication No. CN109628356A discloses a method for preparing an inhibitor to prevent the spontaneous combustion of lignite. A new biological and environmentally friendly flame retardant to prevent the spontaneous combustion of lignite is used, which is environmentally friendly and safe. By fermenting and modifying lignite, only a small amount of the chemical product magnesium chloride is used to achieve a good inhibitory effect. Patent Publication No. CN110005463A discloses a polymer-based nano-composite inhibitor for preventing the spontaneous combustion of coal gangue. The use of a polymer-based nano-composite inhibitor can effectively improve the inhibitory effect of the composite inhibitor and prevent the spontaneous combustion of coal gangue. Patent Announcement No. CN114856678B discloses a method and system for continuous nitrogen injection with a distributed drag pipe in goafs under coal mining conditions to prevent and extinguish fires. By placing a nitrogen main pipe on the coal mining support and extending multiple nitrogen injection pipes directly into the oxidation zone of the goaf, this system continuously suppresses the spontaneous combustion of residual coal in the goaf, improving fire prevention and extinguishing effectiveness while reducing nitrogen backflow and pipe waste. Patent Publication No. CN220360640U discloses a coal pile storage and drying device. This system uses a piping system to control air flow and temperature within the coal pile, utilizing natural wind and air supply devices to remove hot air and moisture, and, when necessary, introducing nitrogen to reduce oxygen exposure. This prevents spontaneous combustion and extinguishes the coal pile. Patent Publication No. CN202039887U authorizes a low-temperature nitrogen fire prevention and extinguishing system for mines. High-pressure nitrogen is extracted using an air compressor and nitrogen generator, and then low-temperature nitrogen is extracted using an air refrigeration unit. This nitrogen is then transported via insulated pipes to the mine fire prevention and extinguishing site. A cooling water system dissipates heat generated during the low-temperature nitrogen production process, effectively isolating the coal from oxygen and reducing its temperature. Patent publication number CN1411876A authorizes a fire prevention and extinguishing technology for preventing coal spontaneous combustion. By adding a foaming agent and introducing nitrogen into the mine's grouting and nitrogen injection systems, a three-phase foam of gas, liquid, and solid is formed. The entrained gas in the foam is retained in the goaf for a long time, providing a suffocating and fire-extinguishing function. Simultaneously, the fly ash or yellow mud on the foam wall permanently isolates the coal from oxygen adsorption, preventing coal oxidation and effectively preventing coal spontaneous combustion.

[0005] At present, in the process of preventing the spontaneous combustion of combustible rock and soil, the situation often occurs that the inhibitor cannot be reused and the fire extinguishing device is difficult to lay. Moreover, if the purpose of preventing spontaneous combustion is further achieved by modifying the combustible rock and soil, it may affect the normal combustion of the combustible rock and soil, causing economic losses. Summary of the Invention

[0006] Purpose of the Invention: The present invention aims to provide an overlying oxygen isolation device and method for preventing spontaneous combustion of combustible rock and soil. This device utilizes a pure nitrogen drying device to extract the gas within the combustible rock and soil, while simultaneously using high-concentration nitrogen to rapidly squeeze out the gas within the combustible rock and soil. This simultaneous operation allows nitrogen to quickly enter the combustible rock and soil, thereby isolating the combustible rock and soil from the air and preventing spontaneous combustion.

[0007] Technical solution: An overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil and a method for use, including a storage yard, two dual-flow nitrogen hoses are arranged on the upper surface of the storage yard, the two dual-flow nitrogen hoses are spaced 0.5m to 3m apart and a plurality of through grooves are provided on the outer surface, the through grooves are distributed along the axial direction of the dual-flow nitrogen hoses, a plurality of lifting arc supports are fixedly installed on the upper surface of the storage yard corresponding to the dual-flow nitrogen hoses, the lifting arc supports are distributed along the axial direction of the dual-flow nitrogen hoses and a push rod is arranged inside, a groove fixing plate is arranged above two lifting arc supports close to each other, the groove fixing plate is movably connected to the push rod, and a net nitrogen drying device is arranged above the groove fixing plate.

[0008] Furthermore, a double-rotation receiver is provided at one end of the dual-flow nitrogen transport hose, a mixed gas buffer box is provided between the double-rotation receivers, the mixed gas buffer box is connected to the double-rotation receiver through a first connecting pipe, a nitrogen detection box is provided above the mixed gas buffer box, the nitrogen detection box and the mixed gas buffer box are connected through a second connecting pipe, and the nitrogen detection box and the net nitrogen drying device are connected through a return air pipe.

[0009] Furthermore, the net nitrogen drying device includes a filter box, a conical tube is fixedly installed on the bottom surface of the filter box, the conical tube is connected to the filter box, an interception plate is fixedly installed on the inner wall of the filter box, and a fixing frame corresponding to the conical tube is fixedly installed between the interception plate and the bottom of the inner wall of the filter box. Several rotating shafts are rotatably installed inside the fixing frame, and several of the rotating shafts are distributed along the side line direction of the filter box. A fan blade is fixedly installed on the end of the rotating shaft away from the fixing frame.

[0010] Furthermore, two screw rods are rotatably installed on the inner wall of the filter box corresponding to the intercepting plate, and the two screw rods are symmetrically distributed about the center line of the filter box. A scraper is set on the inner wall of the filter box corresponding to the intercepting plate, and the scraper is threadedly connected to the two screw rods. Two inclined plates are fixedly installed on the inner wall of the filter box corresponding to the intercepting plate, and a discharge trough is provided through the inner wall of the filter box corresponding to the two inclined plates. A baffle is rotatably installed on the inner wall of the discharge trough, and a first limiting groove is provided on the inner wall of the discharge trough corresponding to the baffle, and a first limiting rod is provided inside the first limiting groove.

[0011] Further, the lifting arc support comprises a fixed rod, an arc-shaped plate is fixedly installed on one end of the fixed rod close to the double-flow nitrogen conveying hose, fixed plates are fixedly installed on both sides of the arc-shaped plate, a first sliding groove is formed in the inside of the fixed rod, a first guide rod is fixedly installed on the bottom of the inner wall of the first sliding groove, a limiting plate is arranged in the inside of the first sliding groove, a top rod is fixedly installed on the side of the limiting plate away from the first guide rod, a first spring is sleeved on the outer surface of the first guide rod, and the two ends of the first spring are fixedly connected with the bottom of the inner wall of the first sliding groove and the bottom surface of the limiting plate respectively.

[0012] Further, a plurality of insertion grooves are formed through the outer surface of the fixed rod, the plurality of insertion grooves are distributed along the axial direction of the fixed rod, a second sliding groove is formed in the inner wall of the limiting plate corresponding to the insertion grooves, a second guide rod is fixedly installed on the inner wall of the second sliding groove, a sliding plate is arranged in the inside of the second sliding groove, an insertion rod corresponding to the insertion grooves is fixedly installed on the side of the sliding plate away from the second guide rod, a second spring is sleeved on the outer surface of the second guide rod, and the two ends of the second spring are fixedly connected with the inner wall of the second sliding groove and the side surface of the sliding plate respectively.

[0013] Further, the double-rotation receiver comprises two support plates, the two support plates are symmetrically distributed about the center line of the double-flow nitrogen conveying hose, an air inlet pipe is arranged between the two support plates, the two ends of the air inlet pipe are rotationally connected with the support plates, the air inlet pipe is in communication with the double-flow nitrogen conveying hose, one of the support plates is provided with a rotating plate on the side away from the mixed gas buffer tank, the rotating plate is fixedly connected with the air inlet pipe, and a handle is rotationally installed on the side of the rotating plate away from the support plate.

[0014] Further, a fixed groove is formed in the bottom surface of the groove-fixed plate corresponding to the top rod, and a second limiting groove is formed in the top end of the top rod corresponding to the fixed groove.

[0015] Further, the inside of each of the plurality of through grooves is movably installed with a stable air pipe.

[0016] Further, the nitrogen detection box is fixedly installed with an air outlet pipe on the side away from the air return pipe, and the air outlet pipe is in communication with the nitrogen detection box.

[0017] A use method of an overlying oxygen isolation device for preventing spontaneous combustion of combustible rock soil, comprising the following steps:

[0018] When installing the equipment, the workers pull the double-flow nitrogen conveying hose to a proper length, then place a plurality of stable air pipes in the corresponding through grooves, then use tools to lift the pure nitrogen drying device to a proper height, the workers use anchor nails through the positioning grooves to vertically fix the lifting arc support, and fix the pure nitrogen drying device.

[0019] When the equipment is in use, high-concentration nitrogen passes through the mixed gas buffer box, the first connecting pipe, and the dual-flow nitrogen hose 2 in sequence to protect the combustible rock and soil through the stable ventilation pipe. The fan blades rotate at high speed to allow the gas between the two dual-flow nitrogen hoses to enter the filter box. The filter material in the filter box filters and dries the gas passing through the filter box. The filtered and dried gas enters the nitrogen detection box through the return air pipe. The nitrogen concentration detector in the nitrogen detection box detects the nitrogen concentration in the gas in the nitrogen detection box. When the nitrogen concentration in the nitrogen detection box cannot be used, the first valve is closed and the second valve is opened, so that the gas in the nitrogen detection box is discharged into the air through the second valve. When the nitrogen concentration in the nitrogen detection box meets the use requirements, the second valve is closed and the first valve is opened, so that the gas in the nitrogen detection box can be reused.

[0020] Beneficial effects: The present invention has the following advantages:

[0021] (1) The present invention uses nitrogen to extinguish fire, releasing a large amount of inert nitrogen in a short period of time to surround the possible combustion area, which not only retards the fire in time but also cleans without residue, protecting valuables and environmentally sensitive areas around the storage yard and ensuring the safety of workers;

[0022] (2) The present invention is provided with a dual-flow nitrogen hose, a clean nitrogen drying device and a nitrogen detection box. High-concentration nitrogen passes through the mixed gas buffer box, the first connecting pipe, the air inlet pipe and the dual-flow nitrogen hose in sequence through the stable ventilation pipe to enter the interior of the combustible rock and soil. At the same time, the clean nitrogen drying device extracts the gas inside the combustible rock and soil, allowing nitrogen to quickly enter the combustible rock and soil. The nitrogen is used to quickly squeeze out the air inside the combustible rock and soil, thereby isolating the combustible rock and soil from the air and preventing the combustible rock and soil from spontaneous combustion.

[0023] (3) Since the organic matter inside the combustible rock and soil is isolated from oxygen, microorganisms cannot use the organic matter to undergo oxidation reactions, thereby preventing the combustible rock and soil from spontaneous combustion;

[0024] (4) The nitrogen detection box detects the gas collected by the filter box. When the nitrogen concentration reaches a certain level, the gas is circulated in the equipment, thereby reducing the amount of nitrogen used.

[0025] (5) The double-rotating receiver can improve the laying efficiency of the dual-flow nitrogen hose and speed up the construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0027] Figure 2 Schematic diagram of the internal structure of the net nitrogen drying device of the present invention;

[0028] Figure 3 for Figure 2Partial enlarged view of middle A;

[0029] Figure 4 For Figure 2 Partial enlarged view of middle B;

[0030] Figure 5 For the internal structure diagram of the lifting arc brace in the application;

[0031] Figure 6 For Figure 5 Partial enlarged view of middle C;

[0032] Figure 7 For Figure 1 Partial enlarged view of middle D;

[0033] Figure 8 For the partial exploded view of the fixed rod and the groove fixed plate in the application;

[0034] Figure 9 For Figure 1 Partial enlarged view of middle E;

[0035] Figure 10 For the internal structure diagram of the nitrogen detection box in the application.

[0036] The figure mark is: 1, stockyard; 2, double-flow nitrogen conveying hose; 3, through groove;

[0037] 4, lifting arc brace: 401, fixed rod; 402, arc plate; 403, fixed plate; 404, first sliding groove; 405, first guide rod; 406, limiting plate; 407, top rod; 408, first spring; 409, insertion slot; 410, second sliding groove; 411, second guide rod; 412, sliding plate; 413, insertion rod; 414, second spring;

[0038] 5, groove fixed plate;

[0039] 6, pure nitrogen drying device: 601, filter box; 602, conical pipe; 603, intercepting plate; 604, fixed frame; 605, rotating shaft; 606, fan blade; 607, lead screw; 608, scraper; 609, inclined plate; 610, discharge chute; 611, first limiting groove; 612, limiting rod;

[0040] 7, double-rotation storage device: 701, support plate; 702, air inlet pipe; 703, rotating plate; 704, handle;

[0041] 8, mixed gas buffer box; 9, first connecting pipe; 10, nitrogen detection box; 11, second connecting pipe; 12, air return pipe; 13, stable air pipe; 14, air outlet pipe. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings.

[0043] Reference Figures 1 to 10 As shown, an embodiment of an overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil of the present invention includes a storage yard 1, two dual-flow nitrogen hoses 2 are set on the upper surface of the storage yard 1, and the two dual-flow nitrogen hoses are spaced 0.5m to 3m apart. The dual-flow nitrogen hoses 2 are symmetrically distributed about the center line of the storage yard 1. The outer surface of the dual-flow nitrogen hoses 2 is provided with a plurality of through grooves 3, and the plurality of through grooves 3 are distributed along the axis direction of the dual-flow nitrogen hoses 2. High-concentration nitrogen is injected into the combustible rock and soil in the storage yard 1 through the plurality of through grooves 3 on the dual-flow nitrogen hoses 2 to isolate the combustible rock and soil from oxygen. A plurality of fixedly installed on the upper surface of the storage yard 1 corresponding to the dual-flow nitrogen hoses 2 A lifting arc support 4 is provided, and several lifting arc supports 4 are distributed along the axial direction of the dual-flow nitrogen conveying hose 2. A push rod 407 is provided inside the lifting arc support 4. A groove fixing plate 5 is provided above the two lifting arc supports 4 close to each other. The groove fixing plate 5 is movably connected to the push rod 407. A nitrogen purification drying device 6 is provided above the groove fixing plate 5. After installing the dual-flow nitrogen conveying hose 2, the staff fixes the dual-flow nitrogen conveying hose 2 through the lifting arc support 4. At the same time, the staff moves the lifting arc support 4 to a suitable position as needed. The nitrogen purification drying device 6 dries and filters the gas between the two dual-flow nitrogen conveying hoses 2 so that the gas can be reused.

[0044] A double-rotation receiver 7 is provided at one end of the dual-flow nitrogen delivery hose 2. When the dual-flow nitrogen delivery hose 2 is maintained, the staff collects the dual-flow nitrogen delivery hose 2 through the double-rotation receiver 7. A mixed gas buffer box 8 is provided between the two double-rotation receivers 7. The mixed gas buffer box 8 is connected to the two double-rotation receivers 7 through a first connecting pipe 9. High-concentration nitrogen enters the dual-flow nitrogen delivery hose 2 through the mixed gas buffer box 8, the first connecting pipe 9 and the double-rotation receiver 7 in sequence. A nitrogen detection box 10 is provided above the mixed gas buffer box 8. The nitrogen detection box 10 is connected to the mixed gas buffer box. 8 are connected through a second connecting pipe 11, a first valve is arranged inside the second connecting pipe 11, the nitrogen detection box 10 and the net nitrogen drying device 6 are connected through a return air pipe 12, and a nitrogen concentration detector is fixedly installed on the top of the nitrogen detection box 10. The nitrogen concentration detector detects the nitrogen concentration in the nitrogen detection box 10. If the concentration meets the use standard, the first valve is opened, and the nitrogen in the nitrogen detection box 10 returns to the mixed gas buffer box 8 through the second connecting pipe 11, so that the nitrogen can be reused. If the concentration does not meet the use standard, the first valve is closed.

[0045] Reference Figures 2 to 4As shown, the net nitrogen drying device 6 includes a filter box 601, a tapered tube 602 is fixedly installed on the bottom surface of the filter box 601, the tapered tube 602 is connected to the filter box 601, and an interception plate 603 is fixedly installed on the inner wall of the filter box 601. The staff places the filter material on the surface of the interception plate 603. The interception plate 603 prevents the filter material from leaving the filter box 601 through the tapered tube 602. A fixing frame 604 corresponding to the tapered tube 602 is fixedly installed between the interception plate 603 and the bottom of the inner wall of the filter box 601. Several rotating shafts 605 are rotatably installed inside the fixing frame 604. Several rotating shafts 605 are distributed along the side line direction of the filter box 601. A fan blade 606 is fixedly installed at one end of the rotating shaft 605 away from the fixing frame 604. The rotating shaft 605 drives the fan blade 606 to rotate at a high speed so that the gas between the dual-flow nitrogen hose 2 enters the filter box 601 through the tapered tube 602, and at the same time, the gas enters the nitrogen detection box 10 through the return pipe 12.

[0046] Two screw rods 607 are installed on the inner wall of the filter box 601 corresponding to the intercepting plate 603. The two screw rods 607 are symmetrically distributed about the center line of the filter box 601. A scraper 608 is set on the inner wall of the filter box 601 corresponding to the intercepting plate 603. The scraper 608 is threadedly connected to the two screw rods 607. Two inclined plates 609 are fixedly installed on the inner wall of the filter box 601 corresponding to the intercepting plate 603. A discharge trough 610 is provided through the inner wall of the filter box 601 corresponding to the two inclined plates 609. A baffle is installed on the inner wall of the discharge trough 610. The inner wall of the discharge trough 610 corresponding to the baffle is provided with a first limiting groove 6 11. A first limiting rod 612 is set inside the first limiting groove 611, and a movable plate is set on the upper surface of the filter box 601. When replacing the filter material, the staff takes out the first limiting rod 612 through the first limiting groove 611, and then the screw rod 607 rotates to make the scraper 608 push the filter material on the surface of the intercepting plate 603 to leave the filter box 601 through the discharge chute 610. After the scraper 608 is reset, the staff resets the baffle and opens the movable plate, and then places the new filter material on the surface of the intercepting plate 603, thereby completing the replacement of the filter material.

[0047] Reference Figure 5 、 Figure 6 and Figure 8As shown, the lifting arc support 4 includes a fixed rod 401, which is fixedly installed with an arc-shaped plate 402 near one end of the double-flow nitrogen conveying hose 2. The arc-shaped plate 402 is fixedly installed with a fixed plate 403 on both sides. The upper part of the fixed plate 403 is provided with a positioning groove. The staff fixes the fixed rod 401 to the surface of the yard 1 by using an anchor through the positioning groove. The inside of the fixed rod 401 is provided with a first sliding groove 404. The bottom of the inner wall of the first sliding groove 404 is fixedly installed with a first guide rod 405. The inside of the first sliding groove 404 is provided with a limiting plate 406. The side of the limiting plate 406 away from the first guide rod 405 is fixedly installed with a top rod 407. The outer surface of the first guide rod 405 is sleeved with a first spring 408. The two ends of the first spring 408 are fixedly connected with the bottom of the inner wall of the first sliding groove 404 and the bottom surface of the limiting plate 406, respectively. The first spring 408 provides the necessary buffering effect for the lifting arc support 4, reducing the damage caused by external impact or vibration.

[0048] The outer surface of the fixed rod 401 is provided with a plurality of insertion grooves 409 distributed along the axial direction of the fixed rod 401. The inner wall of the limiting plate 406 corresponding to the insertion grooves 409 is provided with a second sliding groove 410. The inner wall of the second sliding groove 410 is fixedly installed with a second guide rod 411. The inside of the second sliding groove 410 is provided with a sliding plate 412. The side of the sliding plate 412 away from the second guide rod 411 is fixedly installed with an insertion rod 413 corresponding to the insertion grooves 409. The end of the insertion rod 413 away from the sliding plate 412 is provided with a round corner. In the process of inserting the insertion rod 413 into the insertion grooves 409, the round corner can disperse the stress received by the end of the insertion rod 413. Compared with sharp corners, the round corner can reduce the occurrence of stress concentration, thereby reducing the risk of breaking of the insertion rod 413 due to excessive stress. When the insertion rod 413 is inserted into or pulled out of the insertion grooves 409, the design of the round corner can significantly reduce the friction between the end of the insertion rod 413 and the edge of the insertion grooves 409. Compared with sharp corners, the round corner is less likely to scratch or wear the inner wall of the insertion grooves 409, thereby prolonging the service life of the lifting arc support 4. During the operation process, the staff needs to manually adjust the position of the insertion rod 413. The round corner can reduce the risk of accidental collision or scratching, providing a safer working environment for the staff. The outer surface of the second guide rod 411 is sleeved with a second spring 414. The two ends of the second spring 414 are fixedly connected with the inner wall of the second sliding groove 410 and the side surface of the sliding plate 412, respectively. The staff pushes the insertion rod 413 as needed. When the limiting plate 406 moves in the first sliding groove 404, the second spring 414 pushes the insertion rod 413 on the sliding plate 412 in real time. When the sliding plate 412 moves to the appropriate position, the second spring 414 makes the insertion rod 413 quickly enter the insertion grooves 409 of the corresponding height. The close cooperation of the insertion rod 413 and the insertion grooves 409 ensures that the lifting arc support 4 can remain stable when subjected to external forces, and is not prone to sliding or displacement.

[0049] Reference Figure 7 As shown, the double-rotation receiver 7 includes two support plates 701, and the two support plates 701 are symmetrically distributed about the center line of the dual-flow nitrogen transmission hose 2. An air inlet pipe 702 is arranged between the two support plates 701. Both ends of the air inlet pipe 702 are rotatably connected to the support plates 701 respectively, and the air inlet pipe 702 is communicated with the dual-flow nitrogen transmission hose 2. A rotating plate 703 is provided on the side of one of the support plates 701 away from the mixed gas buffer box 8. The rotating plate 703 is fixedly connected to the air inlet pipe 702. The rotating plate 703 is rotatably installed on the side away from the support plate 701 with a handle 704. When collecting the dual-flow nitrogen transmission hose 2, the staff pushes the handle 704 to rotate the rotating plate 703 around the center line of the rotating plate 703, so that the dual-flow nitrogen transmission hose 2 is wrapped around the surface of the air inlet pipe 702. During the rotation of the rotating plate 703, the support plate 701 limits the rotating plate 703 to prevent the air inlet pipe 702 from being separated from the rotating plate 703.

[0050] A fixing groove is provided on the bottom surface of the groove fixing plate 5 corresponding to the push rod 407, and a second limiting groove is provided on the top of the push rod 407 corresponding to the fixing groove. The staff realizes the quick connection of the lifting arc support 4 and the net nitrogen drying device 6 through the fixing groove and the second limiting groove. When installing the net nitrogen drying device 6, the staff lifts the net nitrogen drying device 6 to a suitable position through the equipment, and then the lifting arc support 4 is unfolded, so that the net nitrogen drying device 6 is quickly connected to the lifting arc support 4.

[0051] Reference Figure 9 As shown, several through grooves 3 are movably installed with stable vent pipes 13 inside. The through grooves 3 may be deformed or damaged due to the long-term weight of the dual-flow nitrogen hose 2 and the influence of the external environment. The existence of the stable vent pipe 13 effectively disperses these pressures, improves the durability and stability of the through grooves 3, and ensures the smooth flow of gas inside the through grooves 3, reduces the air flow resistance caused by the unevenness inside the pipeline, and improves the ventilation efficiency of the entire system. At the same time, the stable vent pipe 13 prevents the combustible rock and soil from squeezing the dual-flow nitrogen hose 2 after contact with the dual-flow nitrogen hose 2, thereby ensuring the ventilation efficiency of the dual-flow nitrogen hose 2.

[0052] Reference Figure 10 As shown, an outlet pipe 14 is fixedly installed on the side of the nitrogen detection box 10 away from the return air pipe 12. The outlet pipe 14 is connected to the nitrogen detection box 10. A second valve is arranged inside the outlet pipe 14. When the nitrogen concentration in the nitrogen detection box 10 cannot be used, the first valve is closed and the second valve is opened, so that the gas in the nitrogen detection box 10 is discharged into the air through the second valve. When the nitrogen concentration in the nitrogen detection box 10 meets the use requirements, the second valve is closed and the first valve is opened, so that the gas in the nitrogen detection box 10 is reused.

[0053] The construction method of the present invention comprises the following steps:

[0054] S1. Install the equipment. The worker pulls the dual-flow nitrogen hose 2 to the appropriate length, then places several stable vent pipes 13 into the corresponding through slots 3. The worker then uses tools to lift the nitrogen-purifying drying device 6 to the appropriate height. The worker then uses anchors to vertically secure the lifting arch support 4 through the positioning slots, and secures the nitrogen-purifying drying device 6.

[0055] S2. Equipment use. High-concentration nitrogen passes through the mixed gas buffer box 8, the first connecting pipe 9, and the dual-flow nitrogen hose 2 in sequence through the stable ventilation pipe 13 to protect the combustible rock and soil. The fan blades rotate at high speed to allow the gas between the dual-flow nitrogen hose 2 to enter the filter box. The filter material in the filter box 6 filters and dries the gas passing through the filter box. The filtered and dried gas enters the nitrogen detection box 10 through the return pipe 12. The nitrogen concentration detector in the nitrogen detection box 10 detects the nitrogen concentration in the gas in the nitrogen detection box 10. When the nitrogen concentration in the nitrogen detection box 10 cannot be used, the first valve is closed and the second valve is opened, so that the gas in the nitrogen detection box 10 is discharged into the air through the second valve. When the nitrogen concentration in the nitrogen detection box 10 meets the use requirements, the second valve is closed and the first valve is opened, so that the gas in the nitrogen detection box 10 can be reused.

[0056] This invention utilizes nitrogen injection to prevent spontaneous combustion of combustible rock and soil. In practical applications, this method enables long-term storage of combustible rock and soil, allowing for the reuse of the overlying oxygen barrier device that prevents spontaneous combustion of combustible rock and soil. This provides a more efficient and economical method for storing combustible rock and soil. Depending on the size of the storage yard, multiple sets of the oxygen barrier devices described herein can be installed to achieve even better results.

Claims

1. An overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil, characterized by: The invention comprises two dual-flow nitrogen conveying hoses (2) arranged on the upper surface of a storage yard (1), wherein the interval between the two dual-flow nitrogen conveying hoses (2) is 0.5m to 3m and a plurality of through grooves (3) are provided on the outer surface thereof, wherein the through grooves (3) are distributed along the axial direction of the dual-flow nitrogen conveying hoses, wherein a plurality of the through grooves (3) are movably installed with a stable ventilation pipe (13) inside, wherein a plurality of lifting arc supports (4) are fixedly installed on the upper surface of the storage yard (1) corresponding to the dual-flow nitrogen conveying hoses (2), wherein the lifting arc supports (4) are distributed along the axial direction of the dual-flow nitrogen conveying hoses and a push rod (407) is provided inside, wherein a groove fixing plate (5) is provided above two lifting arc supports (4) close to each other, wherein the groove fixing plate (5) is movably connected with the push rod (407), and a nitrogen purification drying device (6) is provided above the groove fixing plate (5); A double-rotation receiver (7) is provided at one end of each of the two double-flow nitrogen conveying hoses (2), a mixed gas buffer box (8) is provided between the two double-rotation receivers (7), the mixed gas buffer box (8) and the two double-rotation receivers (7) are communicated with each other via a first connecting pipe (9), a nitrogen detection box (10) is provided above the mixed gas buffer box (8), the nitrogen detection box (10) and the mixed gas buffer box (8) are communicated with each other via a second connecting pipe (11), and the nitrogen detection box (10) and the net nitrogen drying device (6) are communicated with each other via a return air pipe (12); The net nitrogen drying device (6) comprises a filter box (601), a conical tube (602) is fixedly mounted on the bottom surface of the filter box (601), the conical tube (602) is communicated with the filter box (601), an interception plate (603) is fixedly mounted on the inner wall of the filter box (601), a fixing frame (604) corresponding to the conical tube (602) is fixedly mounted between the interception plate (603) and the bottom of the inner wall of the filter box (601), a plurality of rotating shafts (605) are rotatably mounted inside the fixing frame (604), the plurality of rotating shafts (605) are distributed along the sideline direction of the filter box (601), and a fan blade (606) is fixedly mounted on one end of the rotating shaft (605) away from the fixing frame (604).

2. The overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil according to claim 1, characterized in that: Two screw rods (607) are rotatably mounted on the inner wall of the filter box (601) corresponding to the intercepting plate (603), and the two screw rods (607) are symmetrically distributed about the center line of the filter box (601). A scraper (608) is provided on the inner wall of the filter box (601) corresponding to the intercepting plate (603), and the scraper (608) is threadedly connected to the two screw rods (607). Two inclined plates (609) are fixedly mounted on the inner wall of the filter box (601) corresponding to the intercepting plate (603), and a discharge trough (610) is provided through the inner wall of the filter box (601) corresponding to the two inclined plates (609). A baffle is rotatably mounted on the inner wall of the discharge trough (610), and a first limiting groove (611) is provided on the inner wall of the discharge trough (610) corresponding to the baffle, and a first limiting groove (611) is provided inside the first limiting groove (611). A first limiting rod (612) is provided inside the first limiting groove (611).

3. The overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil according to claim 1, characterized in that: The lifting arc support (4) includes a fixed rod (401), wherein the fixed rod (401) is fixedly installed with an arc plate (402) near one end of the dual-flow nitrogen hose (2), and fixed plates (403) are fixedly installed on both sides of the arc plate (402). A first slide groove (404) is provided inside the fixed rod (401), and a first guide rod (405) is fixedly installed at the bottom of the inner wall of the first slide groove (404). A limit plate (406) is provided inside the first slide groove (404), and a top rod (407) is fixedly installed on the side of the limit plate (406) away from the first guide rod (405). A first spring (408) is sleeved on the outer surface of the first guide rod (405), and the two ends of the first spring (408) are fixedly connected to the bottom of the inner wall of the first slide groove (404) and the bottom surface of the limit plate (406) respectively.

4. The overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil according to claim 3, characterized in that: The outer surface of the fixed rod (401) is provided with a plurality of insertion grooves (409), and the plurality of insertion grooves (409) are distributed along the axial direction of the fixed rod (401). The inner wall of the limiting plate (406) corresponding to the insertion groove (409) is provided with a second sliding groove (410), and the inner wall of the second sliding groove (410) is fixedly installed with a second guide rod (411). A sliding plate (412) is provided inside the second sliding groove (410), and an insertion rod (413) corresponding to the insertion groove (409) is fixedly installed on the side of the sliding plate (412) away from the second guide rod (411). A second spring (414) is sleeved on the outer surface of the second guide rod (411), and the two ends of the second spring (414) are fixedly connected to the inner wall of the second sliding groove (410) and the side of the sliding plate (412) respectively.

5. The overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil according to claim 1, characterized in that: The double-rotating receiver (7) comprises two support plates (701), the two support plates (701) being symmetrically distributed about the center line of the dual-flow nitrogen transport hose (2), an air intake pipe (702) being arranged between the two support plates (701), both ends of the air intake pipe (702) being rotatably connected to the support plates (701), and the air intake pipe (702) being in communication with the dual-flow nitrogen transport hose (2), a rotating plate (703) being arranged on a side of one of the support plates (701) away from the mixed gas buffer box (8), the rotating plate (703) being fixedly connected to the air intake pipe (702), and a handle (704) being rotatably mounted on a side of the rotating plate (703) away from the support plate (701).

6. The overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil according to claim 4, characterized in that: A fixing groove is provided on the bottom surface of the groove fixing plate (5) corresponding to the push rod (407), and a second limiting groove is provided on the top end of the push rod (407) corresponding to the fixing groove.

7. The overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil according to claim 1, characterized in that: An outlet pipe (14) is fixedly installed on a side of the nitrogen detection box (10) away from the return air pipe (12), and the outlet pipe (14) is in communication with the nitrogen detection box (10).

8. A method for using the overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil according to any one of claims 1 to 7, characterized in that: The following steps are involved: The dual-flow nitrogen delivery hose (2) is laid, and the staff stretches the dual-flow nitrogen delivery hose (2) to a suitable length; The vent pipe (13) is placed firmly, and the vent pipe (13) is placed in the corresponding through groove (3); The net nitrogen drying device (6) is fixed, and the net nitrogen drying device (6) is lifted to above the installation height using a tool; Fixing the lifting arc support (4) by using anchor nails to fix the lifting arc support vertically through the positioning groove; Fix the net nitrogen drying device (6), lower the net nitrogen drying device (6) using a tool and ensure that the net nitrogen drying device (6) is fixed in place; Nitrogen delivery: high-concentration nitrogen is transported through the mixed gas buffer box (8), the first connecting pipe (9), the dual-flow nitrogen hose (2), and the stable ventilation pipe (13) to protect the combustible rock and soil; Gas collection, through the high-speed rotation of the fan blades, allows the gas between the two dual-flow nitrogen hoses (2) to enter the filter box (601); Gas filtering and drying, the filter material in the filter box (601) filters and dries the gas passing through the filter box (601); Gas return detection: the filtered and dried gas enters the nitrogen detection box (10) through the return gas pipe; Concentration detection: a nitrogen concentration detector in the nitrogen detection box (10) detects the nitrogen concentration in the gas; Discharge of unqualified gas: when the nitrogen concentration in the nitrogen detection box (10) is unusable, the first valve is closed, the second valve is opened, and the gas is discharged into the air through the second valve; The qualified gas is recycled. When the nitrogen concentration in the nitrogen detection box meets the requirements for use, the second valve is closed and the first valve is opened, so that the gas in the nitrogen detection box is reused.

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