Oxygen isolation device for preventing combustible rock and soil from spontaneously combusting, and use method
By extracting the gas inside the combustible rock and soil using a gas treatment device and injecting inert gas, the problems of the inability to reuse inhibitors and the difficulty of laying them are solved, achieving a highly efficient and safe effect in preventing spontaneous combustion of combustible rock and soil.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- SUZHOU UNIV OF SCI & TECH
- Filing Date
- 2025-10-30
- Publication Date
- 2026-06-04
AI Technical Summary
Existing technologies for preventing spontaneous combustion of combustible rock and soil rely on inhibitors that cannot be reused, are difficult to apply, and may affect the normal combustion of the rock and soil, leading to economic losses.
A gas treatment device is used to extract the gas inside the combustible rock and soil, and an inert gas such as high-concentration nitrogen is used to quickly squeeze out the gas inside the combustible rock and soil, thus isolating the combustible rock and soil from the air and preventing spontaneous combustion.
By rapidly introducing inert gas into the soil and rock, flammable soil and rock are isolated from air, preventing spontaneous combustion, reducing nitrogen consumption, and ensuring safety and economy.
Smart Images
Figure CN2025131106_04062026_PF_FP_ABST
Abstract
Description
Oxygen-barrier devices for preventing spontaneous combustion of combustible rock and soil and their usage methods
[0001] Cross-references
[0002] This application is based on and claims priority to Chinese Patent Application No. 202411706152.3, filed on November 26, 2024, the entire contents of which are incorporated herein by reference. Technical Field
[0003] This disclosure relates to the field of oxygen isolation for preventing spontaneous combustion of combustible rock and soil, specifically to an oxygen isolation device and method of use for preventing spontaneous combustion of combustible rock and soil. Background Technology
[0004] Generally, spontaneous combustion of combustible rock and soil is caused by a combination of factors, including the degree of carbonization, volatility, moisture content, oxidation caused by impurities, and oxygen adsorption. Among these factors, the degree of carbonization, i.e., the degree of metamorphism, has a significant impact on spontaneous combustion; the lower the degree of metamorphism of the combustible rock and soil, the easier it is to spontaneously combust.
[0005] Currently, the demand for combustible soil and rock is increasing in power plants and steel mills. Typically, large quantities of combustible soil and rock are stockpiled in power plants, steel mills, mines, and ports, mostly in the open air, and stored for 30-60 days. During this storage period, large amounts of air enter the combustible soil and rock. The carbon-based active groups (hydroxyl, carbonyl, active hydrogen, etc.), sulfur, metal ions, and impurities in the soil and rock react with oxygen in the air, generating heat that accumulates internally. Over time, the internal temperature of the combustible soil and rock gradually rises, accelerating the catalytic oxidation and heat release. Eventually, the accumulated heat reaches the auto-ignition point of the combustible soil and rock, causing spontaneous combustion and ignition, leading to a fire. Furthermore, even if the auto-ignition point is not reached, oxygen in the air can still cause oxidation on the surface of the combustible soil and rock, resulting in deterioration of its quality and a decrease in its commercial and usability value.
[0006] In related technologies, patents concerning the prevention of spontaneous combustion of combustible rock and soil mainly focus on the development of flame retardants or the use of inert gas injection to achieve flame retardancy. Patent publication number CN109628356A discloses a method for preparing a flame retardant to prevent spontaneous combustion of lignite. This method employs a novel, environmentally friendly biological flame retardant for preventing spontaneous combustion of lignite, which is environmentally friendly and safe. Through fermentation modification of lignite, only a small amount of the chemical product magnesium chloride is used to achieve a good flame retardant effect. Patent publication number CN110005463A discloses a polymer-based nanocomposite flame retardant for preventing spontaneous combustion of coal gangue. This polymer-based nanocomposite flame retardant effectively improves the flame retardant effect of the composite flame retardant, preventing spontaneous combustion of coal gangue. Patent announcement number CN114856678B discloses a method and system for continuous nitrogen injection through distributed pipes in goaf areas under coal mining conditions for fire prevention and extinguishing. By arranging nitrogen supply mains on the coal mining supports and extending multiple nitrogen injection pipes directly into the oxidation zone of the goaf, continuous suppression of spontaneous combustion of residual coal in the goaf is achieved, improving fire prevention and extinguishing effects and reducing nitrogen backflow and pipe material waste. Patent publication number CN220360640U discloses a coal pile storage device for preventing spontaneous combustion and drying. It controls the airflow and temperature inside the coal pile through a pipeline system, utilizes natural ventilation and a gas supply device to expel hot air and moisture, and introduces nitrogen when necessary to reduce contact between the coal pile and oxygen, thereby achieving the effects of preventing spontaneous combustion and drying. Patent publication number CN202039887U discloses a mine low-temperature nitrogen fire prevention and extinguishing system. It uses an air compressor unit and a nitrogen generator to produce high-pressure nitrogen, then uses an air refrigeration mechanism to produce low-temperature nitrogen, which is transported to the mine fire prevention and extinguishing location through insulated pipes. Simultaneously, a cooling water system is used to dissipate the heat generated during the low-temperature nitrogen production process, achieving the fire prevention and extinguishing effects of isolating oxygen and lowering the coal temperature. Patent publication number CN1411876A discloses a fire prevention and extinguishing technology for preventing spontaneous combustion of coal. By adding a foaming agent and introducing nitrogen into the grouting and nitrogen injection systems of the mine, a three-phase foam (gas, liquid, and solid) is formed. The residual gas in the foam remains in the goaf for a long time, exerting an asphyxiation fire prevention and extinguishing function. At the same time, the fly ash or yellow mud on the foam wall permanently isolates the coal from oxygen adsorption, preventing coal oxidation and effectively preventing spontaneous combustion of coal.
[0007] Currently, in the process of preventing spontaneous combustion of combustible rock and soil, there are often problems such as the inability to reuse inhibitors and the difficulty in laying extinguishing devices. Furthermore, if the purpose of preventing spontaneous combustion is to be achieved by further modifying combustible rock and soil, it may affect the normal combustion of combustible rock and soil, resulting in economic losses. Summary of the Invention
[0008] This disclosure provides an oxygen-isolating device and method for preventing spontaneous combustion of combustible rock and soil. The device utilizes a gas treatment unit to extract gas from the interior of the combustible rock and soil, while simultaneously using an inert gas, such as high-concentration nitrogen, to rapidly expel the remaining gas. This simultaneous action allows the inert gas to quickly enter the interior of the combustible rock and soil, thereby isolating it from air and preventing spontaneous combustion.
[0009] In some embodiments, the oxygen-barrier device for preventing spontaneous combustion of combustible rock and soil includes a gas input module, a gas processing module, and a gas detection module. The gas input module includes: at least two gas supply hoses disposed on the upper surface of the combustible rock and soil accumulation, with a certain distance between the gas supply hoses, and multiple through grooves opened on the outer surface of the gas supply hoses, the through grooves being distributed along the axial direction of the gas supply hoses, and a vent pipe being movably installed inside each of the multiple through grooves. A receiver is disposed at one end of each gas supply hose, and a gas buffer box is disposed between the receivers. The gas buffer box and the receivers are connected through a first connecting pipe. The gas processing module includes: multiple support components fixedly installed on the upper surface of the combustible rock and soil accumulation on which the gas supply hoses are disposed, an mounting plate disposed above two mutually close support components, and a gas processing device disposed above the mounting plate for filtering and drying the gas entering the gas processing device. The gas detection module includes: a gas detection box disposed above the gas buffer box, the gas detection box and the gas buffer box being connected through a second connecting pipe, and the gas detection box and the gas processing device being connected through a return gas pipe.
[0010] In some embodiments, the distance between the gas delivery hoses is 0.5m to 3m. The support assembly is distributed along the axial direction of the gas delivery hose and has a top rod inside. The mounting plate is movably connected to the top rod. The gas treatment device includes a filter box. A tapered tube is fixedly installed on the bottom surface of the filter box and communicates with the filter box. An interceptor plate is fixedly installed on the inner wall of the filter box. A fixing frame corresponding to the tapered tube is fixedly installed between the interceptor plate and the bottom of the inner wall of the filter box. Multiple rotating shafts are rotatably installed inside the fixing frame. The multiple rotating shafts are distributed along the length direction of the filter box. A fan blade is fixedly installed at the end of the rotating shaft away from the fixing frame.
[0011] In some embodiments, two lead screws are rotatably mounted on the inner wall of the filter box corresponding to the interceptor plate. The two lead screws are symmetrically distributed about the center line of the filter box. A scraper is provided on the inner wall of the filter box corresponding to the interceptor plate. The scraper is threadedly connected to both lead screws. Two inclined plates are fixedly mounted on the inner wall of the filter box corresponding to the interceptor plate. A discharge trough is opened through the inner wall of the filter box corresponding to the two inclined plates. A baffle is rotatably mounted on the inner wall of the discharge trough. A first limiting groove is opened on the inner wall of the discharge trough corresponding to the baffle. A first limiting rod is provided inside the first limiting groove.
[0012] In some embodiments, the support assembly includes a fixing rod, an arc-shaped plate is fixedly installed at one end of the fixing rod near the gas delivery hose, fixing plates are fixedly installed on both sides of the arc-shaped plate, a first sliding groove is formed inside the fixing rod, a first guide rod is fixedly installed at the bottom of the inner wall of the first sliding groove, a limiting plate is provided inside 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 to the bottom of the inner wall of the first sliding groove and the bottom surface of the limiting plate, respectively.
[0013] In some embodiments, a plurality of insertion slots are formed through the outer surface of the fixing rod, and the plurality of insertion slots are distributed along the axial direction of the fixing rod. A second sliding groove is formed on the inner wall of the limiting plate corresponding to the insertion slot. A second guide rod is fixedly installed on the inner wall of the second sliding groove. A sliding plate is provided inside the second sliding groove. An insertion rod corresponding to the insertion slot 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. The two ends of the second spring are fixedly connected to the inner wall of the second sliding groove and the side of the sliding plate, respectively.
[0014] In some embodiments, the receiver includes two support plates symmetrically distributed about the centerline of the gas delivery hose. An air inlet pipe is disposed between the two support plates, with both ends of the air inlet pipe rotatably connected to the support plates and communicating with the gas delivery hose. A rotating plate is disposed on the side of one of the support plates away from the gas buffer tank. The rotating plate is fixedly connected to the air inlet pipe, and a handle is rotatably mounted on the side of the rotating plate away from the support plate.
[0015] In some embodiments, a fixing groove is provided on the bottom surface of the mounting plate corresponding to the top rod, and a second limiting groove is provided on the top end of the top rod corresponding to the fixing groove.
[0016] In some embodiments, an exhaust pipe is fixedly installed on the side of the gas detection box away from the return gas pipe, and the exhaust pipe is connected to the gas detection box.
[0017] In some embodiments, a first valve is provided in the second connecting pipe and a second valve is provided in the exhaust pipe. When the concentration of inert gas in the gas detection box is detected to be below the predetermined usage standard, the first valve is closed and the second valve is opened, allowing the gas in the gas detection box to be discharged into the air through the second valve. When the concentration of inert gas in the gas detection box is detected to be above the predetermined usage standard, the second valve is closed and the first valve is opened, allowing the gas in the gas detection box to enter the gas buffer box for reuse.
[0018] In some embodiments, the method of using an oxygen-barrier device to prevent spontaneous combustion of combustible rock and soil includes the following steps: laying a gas supply hose and stretching the gas supply hose to a suitable length; placing a vent pipe by opening multiple slots on the outer surface of the gas supply hose and placing the vent pipe in the multiple slots; positioning a gas treatment device by using a tool to lift the gas treatment device above the installation height; fixing a support assembly by fixing the support assembly vertically by fixing anchors to the positioning slots; fixing the gas treatment device by using a tool to place the gas treatment device and fix it to the support assembly; and supplying inert gas, which is introduced into the combustible rock and soil through the multiple slots on the gas supply hose to isolate the combustible rock and soil from the oxygen supply hose. Oxygen is collected by a high-speed rotating fan in a gas processing device, which draws gas from between the gas delivery hoses into a filter box within the device. Gas processing involves filtering and drying the gas through filter material within the filter box. Gas return testing follows, with the processed gas returning to a gas detection box via a return pipe. Concentration detection uses a gas concentration detector within the detection box to measure the concentration of inert gas. Unqualified gas is discharged when the inert gas concentration in the detection box is unusable, releasing the gas into the air. Qualified gas is recycled when the inert gas concentration in the detection box meets usage requirements, allowing for reuse of the gas.
[0019] The embodiments disclosed herein have the following advantages:
[0020] (1) The embodiments of this disclosure use inert gas such as nitrogen to extinguish the fire. A large amount of inert gas such as nitrogen is released in a short time to envelop the potentially combustible area. While extinguishing the fire in time, it cleans up the area without leaving any residue, protects valuables and environmentally sensitive areas around the storage yard, and ensures the safety of the staff.
[0021] (2) The embodiments of this disclosure are provided with a gas input module, a gas processing module and a gas detection module. Inert gas, such as high-concentration nitrogen, passes through a gas buffer box, a first connecting pipe, an inlet pipe and a gas delivery hose in sequence, and then enters the interior of the combustible rock and soil through a ventilation pipe. At the same time, the gas processing device extracts the gas inside the combustible rock and soil, so that inert gas, such as nitrogen, quickly enters the interior of the combustible rock and soil. The nitrogen quickly squeezes 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.
[0022] (3) Because the organic matter inside the combustible rock and soil is isolated from oxygen, microorganisms cannot use the organic matter to oxidize and react, thus preventing the combustible rock and soil from spontaneously combusting.
[0023] (4) The gas detection box detects the gas collected by the filter box. When the concentration of inert gas, such as nitrogen, reaches a certain level, the gas is circulated in the equipment, thereby reducing the amount of nitrogen used.
[0024] (5) The receiver can improve the efficiency of laying gas hoses and speed up the construction progress. Attached Figure Description
[0025] Figure 1 is a three-dimensional structural schematic diagram of the oxygen-barrier device according to an embodiment of the present disclosure;
[0026] Figure 2 is a schematic diagram of the internal structure of the gas processing device in an embodiment of this disclosure;
[0027] Figure 3 is a magnified view of part A in Figure 2;
[0028] Figure 4 is a magnified view of part B in Figure 2;
[0029] Figure 5 is a schematic diagram of the internal structure of the support component in an embodiment of this disclosure;
[0030] Figure 6 is a magnified view of part C in Figure 5;
[0031] Figure 7 is a magnified view of part D in Figure 1;
[0032] Figure 8 is a partial exploded view of the fixing rod and mounting plate in an embodiment of this disclosure;
[0033] Figure 9 is a magnified view of part E in Figure 1;
[0034] Figure 10 is a schematic diagram of the internal structure of the gas detection box in an embodiment of this disclosure.
[0035] The diagram is labeled as follows: 1. Storage yard; 2. Gas hose; 3. Through channel; 4. Support assembly: 401. Fixing rod; 402. Arc plate; 403. Fixing plate; 404. First chute; 405. First guide rod; 406. Limiting plate; 407. Top rod; 408. First spring; 409. Insertion slot; 410. Second chute; 411. Second guide rod; 412. Sliding plate; 413. Insertion rod; 414. Second spring; 5. Mounting plate; 6. Gas processing device: 601. Filter box; 602. 603. Conical tube; 604. Interceptor plate; 605. Fixing frame; 606. Rotating shaft; 607. Fan blade; 608. Lead screw; 609. Scraper; 610. Discharge chute; 611. First limiting groove; 612. Limiting rod; 7. Collector; 701. Support plate; 702. Air inlet pipe; 703. Rotating plate; 704. Handle; 8. Gas buffer box; 9. First connecting pipe; 10. Gas detection box; 11. Second connecting pipe; 12. Return pipe; 13. Vent pipe; 14. Exhaust pipe. Detailed Implementation
[0036] The technical solutions in the embodiments of this disclosure will now be clearly and completely described with reference to the accompanying drawings. However, the exemplary embodiments described may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will enable those skilled in the art to fully understand the scope of this disclosure.
[0037] Referring to Figures 1 to 10, the oxygen-isolating device for preventing spontaneous combustion of combustible rock and soil according to an embodiment of this disclosure includes a stockpile 1, which is a stockpile of combustible rock and soil. At least two gas delivery hoses 2 for introducing inert gas are provided on the upper surface of the stockpile 1. This embodiment illustrates the use of two gas delivery hoses 2, but multiple hoses can be used as needed. The gas delivery hoses are spaced a certain distance apart, for example, 0.5m to 3m, or the distance can be arbitrarily set according to actual needs. The gas delivery hoses 2 are symmetrically distributed about the centerline of the stockpile 1 along its length. Multiple through-grooves 3 are formed on the outer surface of the gas delivery hoses 2, distributed along the axial direction of the hoses 2. Inert gas is injected into the combustible rock and soil within the stockpile 1 through the multiple through-grooves 3 on the gas delivery hoses 2, thereby isolating the combustible rock and soil from oxygen. This embodiment illustrates the use of high-concentration nitrogen gas, but other inert gases can also be used, as long as they effectively isolate the combustible rock and soil from oxygen.
[0038] Multiple liftable support assemblies 4 are fixedly installed on the upper surface of the storage yard 1, where the gas hose 2 is installed. The support assemblies 4 are distributed along the axial direction of the gas hose 2. A top rod 407 is installed inside each support assembly 4. An mounting plate 5 is installed above two adjacent support assemblies 4, and the mounting plate 5 is movably connected to the top rod 407. A gas processing device 6 is installed above the mounting plate 5. After the gas hose 2 is installed, it is fixed by the support assemblies 4. Simultaneously, the support assemblies 4 can be moved to a suitable position as needed. The gas processing device 6 dries and filters the gas between the gas hoses 2, allowing the gas to be reused.
[0039] A receiver 7 is installed at one end of each gas delivery hose 2. During maintenance of the gas delivery hose 2, the gas is collected through the receiver 7. A gas buffer tank 8 is installed between the receivers 7, and the gas buffer tank 8 is connected to the receivers 7 via a first connecting pipe 9. Inert gases, such as high-concentration nitrogen, enter the gas delivery hose 2 sequentially through the gas buffer tank 8, the first connecting pipe 9, and the receiver 7.
[0040] A gas detection box 10 is installed above the gas buffer box 8. The gas detection box 10 and the gas buffer box 8 are connected by a second connecting pipe 11, and a first valve is installed inside the second connecting pipe 11. The gas detection box 10 is connected to the gas processing device 6 by a return gas pipe 12. A gas concentration detector is fixedly installed at the top inside the gas detection box 10. The gas concentration detector detects the concentration of inert gas inside the gas detection box 10. If the inert gas concentration meets the predetermined usage standard, the first valve in the second connecting pipe 11 opens, and the gas in the gas detection box 10 returns to the gas buffer box 8 through the second connecting pipe 11, so that the gas can be reused. If the inert gas concentration does not meet the predetermined usage standard, the first valve in the second connecting pipe 11 closes.
[0041] Referring to Figures 2 to 4, the gas treatment device 6 includes a filter box 601. A tapered tube 602 is fixedly installed on the bottom surface of the filter box 601, and the tapered tube 602 communicates with the filter box 601. An interceptor plate 603 is fixedly installed on the inner wall of the filter box 601, and filter material is placed on the surface of the interceptor plate 603. The interceptor plate 603 prevents the filter material from leaving the filter box 601 through the tapered tube 602. A fixing bracket 604 corresponding to the tapered tube 602 is fixedly installed between the interceptor plate 603 and the bottom of the inner wall of the filter box 601. A plurality of rotating shafts 605 are rotatably installed inside the fixing bracket 604. The plurality of rotating shafts 605 are distributed along the length direction of the filter box 601, and a fan blade 606 is fixedly installed at the end of the rotating shaft 605 away from the fixing bracket 604. The rotating shaft 605 drives the fan blade 606 to rotate at high speed, causing the gas between the gas delivery hoses 2 to enter the filter box 601 through the conical tube 602, and causing the gas to enter the gas detection box 10 through the return gas pipe 12.
[0042] Two lead screws 607 are installed on the inner wall of the filter box 601 corresponding to the interceptor plate 603, and the two lead screws 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 interceptor plate 603, and the scraper 608 is threadedly connected to the two lead screws 607. Two inclined plates 609 are fixedly installed on the inner wall of the filter box 601 corresponding to the interceptor plate 603. A discharge chute 610 is opened 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 chute 610. A first limiting groove 611 is opened on the inner wall of the discharge chute 610 corresponding to the baffle. A first limiting rod 612 is provided inside the first limiting groove 611. The upper surface of the filter box 601 is equipped with a movable plate. When the filter material is replaced, the first limiting rod 612 is removed through the first limiting groove 611. Then, the screw 607 rotates, causing the scraper 608 to push the filter material on the surface of the interceptor plate 603 through the discharge chute 610 and leave the filter box 601. After the scraper 608 is reset, the baffle is reset and the movable plate is opened, and new filter material is placed on the surface of the interceptor plate 603, thus completing the replacement of the filter material.
[0043] Referring to Figures 5, 6, and 8, the support assembly 4 includes a fixing rod 401. An arc-shaped plate 402 is fixedly installed at one end of the fixing rod 401 near the gas hose 2. Fixing plates 403 are fixedly installed on both sides of the arc-shaped plate 402. A positioning groove is provided above the fixing plate 403. The fixing rod 401 is fixed to the surface of the storage yard 1 by fixing anchors to the positioning groove. A first sliding groove 404 is formed inside the fixing rod 401. A first guide rod 405 is fixedly installed at the bottom of the inner wall of the first sliding groove 404. A limiting plate 406 is provided inside the first sliding groove 404. A top rod 407 is fixedly installed on the side of the limiting 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. The two ends of the first spring 408 are fixedly connected to 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 necessary cushioning for the support assembly 4, reducing damage caused by external impacts or vibrations.
[0044] Multiple insertion slots 409 are formed through the outer surface of the fixed rod 401, and the multiple insertion slots 409 are distributed along the axial direction of the fixed rod 401. A second sliding groove 410 is formed on the inner wall of the limiting plate 406 corresponding to the insertion slot 409. A second guide rod 411 is fixedly installed on the inner wall of the second sliding groove 410, and a sliding plate 412 is arranged inside the second sliding groove 410. An insertion rod 413 corresponding to the insertion slot 409 is fixedly installed on the side of the sliding plate 412 away from the second guide rod 411, and a rounded corner is provided at the end of the insertion rod 413 away from the sliding plate 412. During the process of the insertion rod 413 being inserted into the insertion slot 409, the rounded corner can disperse the stress on the end of the insertion rod 413. Compared with sharp corners, the rounded corner can reduce the occurrence of stress concentration, thereby reducing the risk of the insertion rod 413 breaking due to excessive stress. When the insertion rod 413 is inserted into or removed from the insertion slot 409, the rounded corner design significantly reduces friction between the end of the insertion rod 413 and the edge of the insertion slot 409. Compared to sharp corners, rounded corners are less likely to scratch or wear the inner wall of the insertion slot 409, thus extending the service life of the support assembly 4. During operation, the position of the insertion rod 413 needs to be manually adjusted. The rounded corners reduce the risk of accidental collisions or scratches, providing a safer working environment for the operator. A second spring 414 is fitted onto the outer surface of the second guide rod 411. The two ends of the second spring 414 are fixedly connected to the inner wall of the second slide groove 410 and the side of the sliding plate 412, respectively. When the operator pushes the insertion rod 413 as needed, and the limiting plate 406 moves within the first slide groove 404, the second spring 414 pushes the sliding plate 412 in real time, causing the insertion rod 413 to abut against the inner wall of the first slide groove 404. When the sliding plate 412 moves to the appropriate position, the second spring 414 causes the insertion rod 413 to quickly enter the insertion slot 409 at the corresponding height. The tight fit between the insertion rod 413 and the insertion slot 409 ensures that the support assembly 4 remains stable when subjected to external forces and will not easily slip or shift.
[0045] Referring to Figure 7, the receiver 7 includes two support plates 701, which are symmetrically distributed about the center line of the gas delivery hose 2. An air inlet pipe 702 is disposed between the two support plates 701. Both ends of the air inlet pipe 702 are rotatably connected to the support plates 701, and the air inlet pipe 702 communicates with the gas delivery hose 2. A rotating plate 703 is disposed on the side of one of the support plates 701 away from the gas buffer tank 8. The rotating plate 703 is fixedly connected to the air inlet pipe 702, and a handle 704 is rotatably mounted on the side of the rotating plate 703 away from the support plate 701. When collecting the gas delivery hose 2, pushing the handle 704 causes the rotating plate 703 to rotate around its center line, thereby causing the gas delivery hose 2 to wrap around the surface of the air inlet pipe 702. During the rotation of the rotating plate 703, the support plates 701 limit the rotation of the rotating plate 703, preventing the air inlet pipe 702 from detaching from the rotating plate 703.
[0046] The bottom surface of the mounting plate 5 corresponding to the top rod 407 has a fixing groove, and the top end of the top rod 407 corresponding to the fixing groove has a second limiting groove. The fixing groove and the second limiting groove enable quick connection between the support assembly 4 and the gas treatment device 6. When installing the gas treatment device 6, the operator uses tools to lift the gas treatment device 6 to a suitable position and then unfolds the support assembly 4, thereby enabling quick connection between the gas treatment device 6 and the support assembly 4.
[0047] Referring to Figure 9, vent pipes 13 are movably installed inside multiple channels 3. Channels 3 may deform or be damaged due to long-term bearing the weight of the gas delivery hose 2 and the influence of the external environment. The presence of vent pipes 13 effectively disperses these pressures, improving the durability and stability of the channels 3. Furthermore, vent pipes 13 ensure smooth gas flow within the channels 3, reducing airflow resistance caused by unevenness inside the pipes, improving the overall ventilation efficiency of the system. Simultaneously, vent pipes 13 prevent combustible soil from contacting the gas delivery hose 2 and compressing it, thus ensuring the ventilation efficiency of the gas delivery hose 2.
[0048] Referring to Figure 10, an exhaust pipe 14 is fixedly installed on the side of the gas detection box 10 away from the return gas pipe 12. The exhaust pipe 14 is connected to the gas detection box 10, and a second valve is installed inside the exhaust pipe 14. When the concentration of inert gas in the gas detection box 10 is unusable, i.e., does not meet the predetermined usage standard, the first valve in the second connecting pipe 11 closes, and the second valve in the exhaust pipe 14 opens, allowing the gas in the gas detection box 10 to be discharged into the air through the second valve. When the concentration of inert gas in the gas detection box 10 meets the usage standard, i.e., meets the predetermined usage standard, the second valve in the exhaust pipe 14 closes, and the first valve in the second connecting pipe 11 opens, allowing the gas in the gas detection box 10 to be reused.
[0049] As described above, the oxygen-barrier device for preventing spontaneous combustion of combustible rock and soil according to this embodiment includes a gas input module for introducing inert gas into the combustible rock and soil accumulation (stockpile) 1. The gas input module consists of a gas delivery hose 2, a receiver 7, a gas buffer tank 8, and a first connecting pipe 9. The inert gas is introduced into the combustible rock and soil accumulation 1 through the gas buffer tank 8, the first connecting pipe 9, the gas delivery hose 2, and then through the vent pipe 13 in the gas delivery hose 2.
[0050] The oxygen-barrier device for preventing spontaneous combustion of combustible rock and soil according to this embodiment further includes a gas processing module for extracting, drying, and filtering the gas inside the combustible rock and soil accumulation body. The support assembly 4, mounting plate 5, and gas processing device 6 constitute this gas processing module. The high-speed rotation of the fan blades 606 in the gas processing device 6 causes the gas between the gas delivery hoses 2 to enter the filter box 601. The filter material inside the filter box 601 filters and dries the gas passing through the filter box, and the filtered and dried gas enters the gas detection box 10 through the return gas pipe 12.
[0051] The oxygen-barrier device for preventing spontaneous combustion of combustible rock and soil according to this embodiment further includes a gas detection module, which detects the concentration of inert gas in the gas after it has been processed by the gas processing module. When the concentration of inert gas reaches a predetermined usage standard, the gas enters the gas input module for reuse. When the concentration of inert gas does not reach the predetermined usage standard, the gas is discharged into the air. The gas detection box 10, the second connecting pipe 11, and the return gas pipe 12 constitute the gas detection module.
[0052] The oxygen-barrier device used to prevent spontaneous combustion of combustible rock and soil, as described above, allows inert gas, such as high-concentration nitrogen, to sequentially pass through a gas buffer tank, a first connecting pipe, an inlet pipe, and a gas delivery hose. It then enters the interior of the combustible rock and soil through a vent pipe. Simultaneously, a gas processing device extracts gas from the interior of the combustible rock and soil, allowing nitrogen to rapidly enter and displace the air inside, thus isolating the combustible rock and soil from air and preventing spontaneous combustion. A gas detection box monitors the gas collected in the filter box. When the concentration of inert gas, such as nitrogen, reaches a certain level, the gas is circulated within the equipment, reducing the amount of inert gas used.
[0053] The construction method of the oxygen-barrier device for preventing spontaneous combustion of combustible rock and soil according to the embodiments of this disclosure includes the following steps:
[0054] S1. Install the equipment. The staff pulls the gas hose 2 to the appropriate length, then places multiple vent pipes 13 into the corresponding slots 3, and then uses tools to lift the gas processing device 6 to the appropriate height. The support assembly 4 is vertically fixed by fixing the anchor pins to the positioning slot, and the gas processing device 6 is then fixed.
[0055] S2. Equipment Usage. Inert gas (e.g., high-concentration nitrogen) sequentially passes through gas buffer tank 8, first connecting pipe 9, and gas delivery hose 2, and is protected against combustible soil and rock through vent pipe 13. High-speed rotation of fan blade 606 causes the gas between gas delivery hoses 2 to enter filter tank 601. The filter material within filter tank 601 filters and dries the gas passing through it. The filtered and dried gas then enters gas detection tank 10 through return pipe 12. A gas concentration detector in gas detection tank 10 detects the concentration of inert gas, such as nitrogen, within the tank. When the inert gas concentration in gas detection tank 10 does not meet the predetermined usage standard, the first valve closes and the second valve opens, allowing the gas in gas detection tank 10 to be discharged into the air through the second valve. When the inert gas concentration in gas detection tank 10 meets the predetermined usage standard, the second valve closes and the first valve opens, allowing the gas in gas detection tank 10 to be reused.
[0056] This disclosure utilizes the injection of inert gases, such as nitrogen, to prevent spontaneous combustion of combustible soil and rock. In practical engineering, this method allows for long-term storage of combustible soil and rock, and enables the reuse of oxygen-barrier devices to prevent spontaneous combustion. This provides a more efficient and economical method for storing combustible soil and rock. Depending on the size of the storage yard, multiple sets of the oxygen-barrier devices described in this disclosure can be installed to provide better performance.
[0057] Example embodiments have been disclosed herein, and while specific terminology has been used, it is for illustrative purposes only and should be construed as such, and is not intended to be limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in connection with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in connection with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of this disclosure as set forth by the appended claims.
Claims
1. An oxygen-barrier device for preventing spontaneous combustion of combustible rock and soil, characterized in that, It includes a gas input module, a gas processing module, and a gas detection module. The gas input module includes at least two gas supply hoses (2) disposed on the upper surface of the combustible rock and soil accumulation (1), the gas supply hoses being spaced apart by a certain distance, and the outer surface of the gas supply hoses being provided with multiple through grooves (3), the through grooves being distributed along the axial direction of the gas supply hoses, and each of the multiple through grooves having a movably installed vent pipe (13). A receiver (7) is provided at one end of each gas delivery hose, and a gas buffer tank (8) is provided between the receivers. The gas buffer tank and the receiver are connected by a first connecting pipe (9). The gas treatment module includes: multiple support components (4) fixedly installed on the upper surface of the combustible rock and soil accumulation body on which the gas delivery hose is provided; an mounting plate (5) is provided above two mutually close support components; and a gas treatment device (6) is provided above the mounting plate for filtering and drying the gas entering the gas treatment device. The gas detection module includes: a gas detection box (10) disposed above the gas buffer box, the gas detection box and the gas buffer box being connected by a second connecting pipe (11), and the gas detection box and the gas processing device being connected by a return gas pipe (12).
2. The oxygen-barrier device for preventing spontaneous combustion of combustible rock and soil according to claim 1, characterized in that, The distance between the gas delivery hoses is 0.5m to 3m. The support assembly is distributed along the axial direction of the gas delivery hose and has a top rod (407) inside it. The mounting plate is movably connected to the top rod. The gas processing device (6) includes a filter box (601), a tapered tube (602) is fixedly installed on the bottom surface of the filter box, the tapered tube is connected to the filter box, an interceptor plate (603) is fixedly installed on the inner wall of the filter box, a fixing frame (604) corresponding to the tapered tube is fixedly installed between the interceptor plate and the bottom of the inner wall of the filter box, and a plurality of rotating shafts (605) are rotatably installed inside the fixing frame, the plurality of rotating shafts are distributed along the length direction of the filter box, and a fan blade (606) is fixedly installed at the end of the rotating shaft away from the fixing frame.
3. The oxygen-barrier device for preventing spontaneous combustion of combustible rock and soil according to claim 2, characterized in that, Two lead screws (607) are rotatably mounted on the inner wall of the filter box corresponding to the interceptor plate. The two lead screws are symmetrically distributed about the center line of the filter box. A scraper (608) is provided on the inner wall of the filter box corresponding to the interceptor plate. The scraper is threadedly connected to the two lead screws. Two inclined plates (609) are fixedly installed on the inner wall of the filter box corresponding to the interceptor plate. A discharge trough (610) is opened through the inner wall of the filter box corresponding to the two inclined plates. A baffle is rotatably mounted on the inner wall of the discharge trough. A first limiting groove (611) is opened on the inner wall of the discharge trough corresponding to the baffle. A first limiting rod (612) is provided inside the first limiting groove.
4. The oxygen-barrier device for preventing spontaneous combustion of combustible rock and soil according to claim 2, characterized in that, The support assembly further includes a fixing rod (401), an arc-shaped plate (402) is fixedly installed at one end of the fixing rod near the gas delivery hose, and fixing plates (403) are fixedly installed on both sides of the arc-shaped plate. The fixed rod has a first groove (404) inside. A first guide rod (405) is fixedly installed at the bottom of the inner wall of the first groove. A limiting plate (406) is provided inside the first groove. A top rod is fixedly installed on the side of the limiting plate away from the first guide rod. A first spring (408) is sleeved on the outer surface of the first guide rod. The two ends of the first spring are fixedly connected to the bottom of the inner wall of the first groove and the bottom surface of the limiting plate, respectively.
5. The oxygen-barrier device for preventing spontaneous combustion of combustible rock and soil according to claim 4, characterized in that, Multiple insertion slots (409) are formed through the outer surface of the fixing rod. The multiple insertion slots are distributed along the axial direction of the fixing rod. A second sliding groove (410) is formed on the inner wall of the limiting plate corresponding to the insertion slot. A second guide rod (411) is fixedly installed on the inner wall of the second sliding groove. A sliding plate (412) is provided inside the second sliding groove. An insertion rod (413) corresponding to the insertion slot is fixedly installed on the side of the sliding plate away from the second guide rod. A second spring (414) is sleeved on the outer surface of the second guide rod. The two ends of the second spring are fixedly connected to the inner wall of the second sliding groove and the side of the sliding plate, respectively.
6. The oxygen-barrier device for preventing spontaneous combustion of combustible rock and soil according to claim 1, characterized in that, The receiver includes two support plates (701) symmetrically distributed about the center line of the gas delivery hose. An air inlet pipe (702) is provided between the two support plates. Both ends of the air inlet pipe are rotatably connected to the support plates and communicate with the gas delivery hose. A rotating plate (703) is provided on the side of one of the support plates away from the gas buffer box. The rotating plate is fixedly connected to the air inlet pipe. A handle (704) is rotatably installed on the side of the rotating plate away from the support plate.
7. The oxygen-barrier device for preventing spontaneous combustion of combustible rock and soil according to claim 2, characterized in that, A fixing groove is provided on the bottom surface of the mounting plate corresponding to the top rod, and a second limiting groove is provided on the top end of the top rod corresponding to the fixing groove.
8. The oxygen-barrier device for preventing spontaneous combustion of combustible rock and soil according to claim 1, characterized in that, An exhaust pipe (14) is fixedly installed on the side of the gas detection box away from the return gas pipe (12), and the exhaust pipe is connected to the gas detection box (10).
9. The oxygen-barrier device for preventing spontaneous combustion of combustible rock and soil according to claim 8, characterized in that, A first valve is installed in the second connecting pipe, and a second valve is installed in the exhaust pipe. When the concentration of inert gas in the gas detection chamber is detected to be below the predetermined usage standard, the first valve closes and the second valve opens, allowing the gas in the gas detection chamber to be discharged into the air through the second valve; when the concentration of inert gas in the gas detection chamber is detected to be above the predetermined usage standard, the second valve closes and the first valve opens, allowing the gas in the gas detection chamber to enter the gas buffer tank for reuse.
10. A method of using an oxygen-barrier device to prevent spontaneous combustion of combustible rock and soil, characterized in that, Includes the following steps: Lay out the gas delivery hose (2) and stretch the gas delivery hose (2) to a suitable length; Place the vent pipe (13), and open multiple through grooves (3) on the outer surface of the air supply hose, and place the vent pipe (13) in the multiple through grooves; Position the gas treatment device (6) and use tools to lift the gas treatment device (6) above the installation height; The support assembly (4) is fixed vertically by fixing the anchor pins to the positioning groove; Fix the gas treatment device (6), place the gas treatment device (6) using a tool and fix it to the support assembly; Inert gas is transported through multiple channels (3) on the gas delivery hose (2) into the combustible rock and soil, isolating the combustible rock and soil from oxygen. Gas collection is achieved by the high-speed rotation of the fan blades in the gas processing device (6), which causes the gas between the gas delivery hoses (2) to enter the filter box (601) in the gas processing device (6); Gas processing involves filtering and drying the gas passing through the filter box (601) using filter material. Gas return detection: The treated gas enters the gas detection chamber (10) through the return gas pipe; Concentration detection: The concentration of inert gas in the gas is detected by the gas concentration detector in the gas detection box (10); Unqualified gas emission: When the inert gas concentration in the gas detection box (10) is unusable, the gas is discharged into the air; The qualified gas is recycled. When the concentration of inert gas in the gas detection chamber meets the requirements, the gas in the gas detection chamber can be reused.