Overlying oxygen isolation device for preventing combustible rock soil from spontaneous combustion and use method of overlying oxygen isolation device

Abstract

The overlying oxygen isolation device comprises a storage yard, a plurality of double-flow nitrogen conveying hoses are arranged on the upper surface of the storage yard, the interval between every two adjacent double-flow nitrogen conveying hoses is 0.5-3 m, a plurality of through grooves are formed in the outer surfaces of the double-flow nitrogen conveying hoses, the through grooves are distributed in the axis direction of the double-flow nitrogen conveying hoses, and the through grooves are communicated with the double-flow nitrogen conveying hoses. And a plurality of lifting arc supports are fixedly mounted on the upper surface of the storage yard corresponding to the double-flow nitrogen conveying hose. By arranging a double-flow nitrogen conveying hose, a nitrogen purifying and drying device and a nitrogen detection box, high-concentration nitrogen sequentially passes through a mixed gas buffer box, a first connecting pipe, a gas inlet pipe and a stable ventilation pipe and enters the combustible rock soil through the double-flow nitrogen conveying hose, and meanwhile, the nitrogen purifying and drying device extracts gas in the combustible rock soil; nitrogen rapidly enters the flammable rock-soil, air in the flammable rock-soil is rapidly extruded out through the nitrogen, and therefore the flammable rock-soil and the air are isolated, and spontaneous combustion of the flammable rock-soil is prevented.

Description

Technical Field

[0001] The invention relates to the field of overlying oxygen isolation for 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 use method thereof. Background Art

[0002] Generally speaking, spontaneous combustion of combustible rock and soil is caused by many factors, including carbonization degree, volatility, moisture, oxidation caused by impurities, oxygen adsorption, etc. Among them, the carbonization degree of combustible rock and soil, that is, the degree of metamorphism, has a greater impact on spontaneous combustion. The lower the degree of metamorphism of the combustible rock and soil, the easier it is to spontaneously combust.

[0003] At present, the demand for combustible rock and soil in power plants, steel mills, etc. is increasing. Usually, in power plants, steel mills, mines, ports, etc., a large amount of combustible rock and soil is piled up in the yard, most of which are placed in the open air, and the stacking storage time is generally 30 to 60 days. During the stacking process, a large amount of air is poured into the combustible rock and soil, and the carbon-based active groups (hydroxyl, carbonyl, active hydrogen, etc.), sulfur, metal ions, impurities and other components in the combustible rock and soil undergo oxidation reactions with oxygen in the air, emitting heat and accumulating inside. As time goes by, the internal temperature of the combustible rock and soil gradually rises, and the catalytic oxidation heat release gradually accelerates. Finally, the heat accumulation reaches the spontaneous combustion ignition point of the combustible rock and soil, resulting in spontaneous combustion and fire. In addition, even if the ignition point is not reached, the oxygen in the air will cause oxidation on the surface of the combustible rock and soil, causing the quality of the combustible rock and soil to deteriorate, and the commodity value and use value to decrease.

[0004] Prior to the present invention, patents related to preventing spontaneous combustion of combustible rock and soil mainly focused on developing inhibitors to prevent spontaneous combustion of combustible rock and soil, or achieving the purpose of flame retardancy by injecting inert gas. Patent Publication No. CN109628356A discloses a method for preparing an inhibitor to prevent spontaneous combustion of lignite. A new biological and environmentally friendly flame retardant to prevent spontaneous combustion of lignite is adopted, which is environmentally friendly and safe. By fermenting and modifying lignite, only a small amount of 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 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 spontaneous combustion of coal gangue. Patent Announcement No. CN114856678B discloses a method and system for continuous nitrogen injection in a goaf area under coal mining conditions. By arranging a nitrogen delivery main pipe on the coal mining support, and extending multiple nitrogen injection pipes from it directly into the oxidation zone of the goaf, continuous suppression of the oxidation and spontaneous combustion of the coal in the goaf can be achieved, the fire prevention and extinguishing effect can be improved, and nitrogen backflow and pipe waste can be reduced. Patent announcement number CN220360640U discloses a coal pile storage and spontaneous combustion prevention and drying device. By setting up a pipeline system to control the air flow and temperature inside the coal pile, using natural wind and air supply devices to discharge hot air and moisture, and introducing nitrogen when necessary to reduce the contact between the coal pile and oxygen, the effect of spontaneous combustion prevention and drying can be achieved. Patent announcement number CN202039887U authorizes a mine low-temperature nitrogen fire prevention and extinguishing system. High-pressure nitrogen is extracted by an air compressor unit and a nitrogen generator, and low-temperature nitrogen is extracted by an air refrigeration mechanism. It is transported to the mine fire prevention and extinguishing location through an insulated pipeline. At the same time, the heat generated in the process of producing low-temperature nitrogen is discharged by a cooling water system to achieve the fire prevention and extinguishing effect of isolating oxygen and reducing coal temperature. Patent publication number CN1411876A authorizes a fire prevention and extinguishing technology for preventing and controlling coal spontaneous combustion. By adding a foaming agent and introducing nitrogen into the grouting and nitrogen injection system of the mine, a gas, liquid and solid three-phase foam is formed, and the re-gas in the foam is retained in the goaf for a long time to play a suffocating and fire prevention function. At the same time, the fly ash or yellow mud on the foam wall permanently isolates the coal from oxygen adsorption, prevents coal oxidation, and effectively prevents coal spontaneous combustion.

[0005] At present, in the process of preventing the spontaneous combustion of combustible rock and soil, it is often the case that the inhibitor cannot be reused and the fire extinguishing device is difficult to lay. 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 and cause economic losses. Summary of the invention

[0006] Purpose of the invention: The purpose of the present invention is to provide an oxygen-isolating device for preventing spontaneous combustion of combustible rock and soil and a method for using the device, which uses a net nitrogen drying device to extract the gas inside the combustible rock and soil, and uses high-concentration nitrogen to quickly squeeze out the gas inside the combustible rock and soil. The two are carried out simultaneously, so that nitrogen quickly enters 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.

[0007] Technical solution: An overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil and a method of use, comprising a storage yard, wherein two double-flow nitrogen hoses are arranged on the upper surface of the storage yard, the two double-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 double-flow nitrogen hoses, a plurality of lifting arc supports are fixedly installed on the upper surface of the storage yard corresponding to the double-flow nitrogen hoses, the lifting arc supports are distributed along the axial direction of the double-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 is connected to the mixed gas buffer box through a second connecting pipe, and the nitrogen detection box is connected to the net nitrogen drying device 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, 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, a plurality of rotating shafts are rotatably installed inside the fixing frame, the plurality of rotating shafts are distributed along the sideline direction of the filter box, and a fan blade is fixedly installed on one 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 limit groove is provided on the inner wall of the discharge trough corresponding to the baffle, and a first limit rod is set inside the first limit groove.

[0011] Furthermore, the lifting arc support includes a fixed rod, and an arc plate is fixedly installed on one end of the fixed rod close to the dual-flow nitrogen hose, and fixed plates are fixedly installed on both sides of the arc plate. A first slide groove is provided inside the fixed rod, and a first guide rod is fixedly installed on the bottom of the inner wall of the first slide groove. A limit plate is arranged inside the first slide groove, and a top rod is fixedly installed on the side of the limit plate away from the first guide rod. A first spring is sleeved on the outer surface of the first guide rod, and both ends of the first spring are fixedly connected to the bottom of the inner wall of the first slide groove and the bottom surface of the limit plate respectively.

[0012] Furthermore, a plurality of insertion grooves are formed through the outer surface of the fixed rod, and the plurality of insertion grooves are distributed along the axial direction of the fixed rod. A second sliding groove is formed on the inner wall of the limiting plate corresponding to the insertion groove, and a second guide rod is fixedly installed on the inner wall of the second sliding groove. A sliding plate is arranged inside the second sliding groove, and an insertion rod corresponding to the insertion groove 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 both 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.

[0013] Furthermore, the double-rotation receiver includes two support plates, and the two support plates are symmetrically distributed about the center line of the dual-flow nitrogen transport hose. An air intake pipe is arranged between the two support plates, and both ends of the air intake pipe are rotatably connected to the support plates respectively, and the air intake pipe is connected to the dual-flow nitrogen transport hose. A rotating plate is arranged on the side of one of the support plates away from the mixed gas buffer box, and the rotating plate is fixedly connected to the air intake pipe. A handle is rotatably installed on the side of the rotating plate away from the support plate.

[0014] Furthermore, a fixing groove is provided on the bottom surface of the groove fixing plate corresponding to the push rod, and a second limiting groove is provided on the top end of the push rod corresponding to the fixing groove.

[0015] Furthermore, ventilation pipes are movably mounted and secured inside a plurality of the through grooves.

[0016] Furthermore, an air outlet pipe is fixedly installed on a side of the nitrogen detection box away from the air return pipe, and the air outlet pipe is communicated with the nitrogen detection box.

[0017] A method for using an overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil comprises the following steps:

[0018] When installing the equipment, the staff pulled the dual-flow nitrogen hose to the appropriate length, then placed several stable ventilation pipes in the corresponding through slots, and then used tools to lift the net nitrogen drying device to the appropriate height. The staff used anchors to fix the lifting arc support vertically through the positioning slots and fixed the net 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 a 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 wrap the possible combustion area, which can timely retard the fire and clean without residue, protect valuables and environmentally sensitive areas around the storage yard, and ensure 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 and enters the interior of the combustible rock and soil through the stable ventilation pipe. At the same time, the clean nitrogen drying device extracts the gas inside the combustible rock and soil, so that the nitrogen quickly enters the combustible rock and soil, and uses the nitrogen 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, thus 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-rotation 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 in the present invention;

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

[0029] Figure 4 for Figure 2 A partial enlarged view of B in the middle;

[0030] Figure 5 It is a schematic diagram of the internal structure of the lifting arc support in the present invention;

[0031] Figure 6 for Figure 5 A partial enlarged view of middle C;

[0032] Figure 7 for Figure 1 A partial enlarged view of D in the middle;

[0033] Figure 8 It is a partial exploded view of the fixing rod and the groove fixing plate in the present invention;

[0034] Fig. 9 for Figure 1 A partial enlarged view of E in the middle;

[0035] Fig.10 Schematic diagram of the internal structure of the nitrogen detection box in the present invention.

[0036] The numbers in the figure are: 1, storage yard; 2, dual-flow nitrogen hose; 3, through slot;

[0037] 4. Lifting arc support: 401, fixed rod; 402, arc plate; 403, fixed plate; 404, first slide groove; 405, first guide rod; 406, limit plate; 407, push rod; 408, first spring; 409, insertion groove; 410, second slide groove; 411, second guide rod; 412, sliding plate; 413, insertion rod; 414, second spring;

[0038] 5. Groove fixing plate;

[0039] 6. Net nitrogen drying device: 601, filter box; 602, conical tube; 603, interception plate; 604, fixed frame; 605, rotating shaft; 606, fan blade; 607, screw rod; 608, scraper; 609, inclined plate; 610, discharge trough; 611, first limit groove; 612, limit 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. Return air pipe; 13. Stable ventilation pipe; 14. Exhaust pipe. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with 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 comprises a stockpile 1, two double-flow nitrogen hoses 2 are arranged on the upper surface of the stockpile 1, the two double-flow nitrogen hoses are spaced 0.5m to 3m apart, the double-flow nitrogen hoses 2 are symmetrically distributed about the center line of the stockpile 1, a plurality of through grooves 3 are provided on the outer surface of the double-flow nitrogen hose 2, and the plurality of through grooves 3 are distributed along the axial direction of the double-flow nitrogen hose 2, high-concentration nitrogen is injected into the combustible rock and soil in the stockpile 1 through the plurality of through grooves 3 on the double-flow nitrogen hose 2, and the combustible rock and soil are isolated from oxygen, and a plurality of through grooves 3 are fixedly installed on the upper surface of the stockpile 1 corresponding to the double-flow nitrogen hose 2 A lifting arc support 4 is provided, and several lifting arc supports 4 are distributed along the axial direction of the double-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 two lifting arc supports 4 close to each other. The groove fixing plate 5 is movably connected with the push rod 407. A nitrogen purifying drying device 6 is provided above the groove fixing plate 5. After installing the double-flow nitrogen conveying hose 2, the staff fixes the double-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 according to needs. The nitrogen purifying drying device 6 dries and filters the gas between the two double-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 double-flow nitrogen delivery hose 2. When the double-flow nitrogen delivery hose 2 is maintained, the staff collects the double-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 double-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, 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, 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 conical tube 602 is fixedly installed on the bottom surface of the filter box 601, the conical 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, and the interception plate 603 prevents the filter material from leaving the filter box 601 through the conical tube 602. A fixed frame 604 corresponding to the conical tube 602 is fixedly installed between the interception plate 603 and the bottom of the inner wall of the filter box 601, and a plurality of rotating shafts 605 are rotatably installed inside the fixed frame 604, and the plurality of rotating shafts 605 are distributed along the sideline direction of the filter box 601. A fan blade 606 is fixedly installed at one end of the rotating shaft 605 away from the fixed frame 604, and the rotating shaft 605 drives the fan blade 606 to rotate at a high speed so that the gas between the dual-flow nitrogen transmission hose 2 enters the filter box 601 through the conical tube 602, and at the same time, the gas enters the nitrogen detection box 10 through the return air pipe 12.

[0046] Two screw rods 607 are installed 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 arranged on the inner wall of the filter box 601 corresponding to the intercepting plate 603, and the scraper 608 is threadedly connected with 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, and a baffle is installed on the inner wall of the discharge trough 610. A first limiting groove 606 is provided on the inner wall of the discharge trough 610 corresponding to the baffle 11. A first limiting rod 612 is arranged inside the first limiting groove 611, and a movable plate is arranged 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 groove 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 fixing rod 401, and the fixing rod 401 is fixedly installed with an arc plate 402 near one end of the dual-flow nitrogen conveying hose 2, and fixing plates 403 are fixedly installed on both sides of the arc plate 402. A positioning groove is arranged above the fixing plate 403, and the staff uses anchor nails to fix the fixing rod 401 to the surface of the yard 1 through the positioning groove. A first slide groove 404 is provided inside the fixing 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 limiting plate 406 is arranged inside the first slide groove 404, and 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, and the two ends of the first spring 408 are respectively fixedly connected to the bottom of the inner wall of the first slide groove 404 and the bottom surface of the limiting plate 406. The first spring 408 provides a necessary buffering effect for the lifting arc support 4, thereby reducing the damage caused by external impact or vibration.

[0048] The outer surface of the fixed rod 401 is penetrated by a plurality of insertion grooves 409, and the plurality of insertion grooves 409 are distributed along the axial direction of the fixed rod 401. A second sliding groove 410 is provided on the inner wall of the limiting plate 406 corresponding to the insertion groove 409, and a second guide rod 411 is fixedly installed on the inner wall of the second sliding groove 410. A sliding plate 412 is arranged 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 rounded corner is arranged on the end of the insertion rod 413 away from the sliding plate 412. In the process of inserting the insertion rod 413 into the insertion groove 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 pulled out of the insertion groove 409, the rounded corner design can significantly reduce the friction between the end of the insertion rod 413 and the edge of the insertion groove 409. Compared with sharp corners, the rounded corner is more The second spring 414 is used to push the insert rod 413 on the sliding plate 412 to prevent the lifting arc support 4 from sliding or displacing when the lifting arc support 4 is in a state of being easily damaged.

[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 transport 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 transport hose 2. A rotating plate 703 is arranged 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. A handle 704 is rotatably installed on the side of the rotating plate 703 away from the support plate 701. When collecting the dual-flow nitrogen transport 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 transport 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 between 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 Fig. 9 As shown, several through grooves 3 are movably installed with stable ventilation 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 ventilation 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 ventilation pipe 13 prevents the combustible rock and soil from squeezing the dual-flow nitrogen hose 2 after contacting the dual-flow nitrogen hose 2, thereby ensuring the ventilation efficiency of the dual-flow nitrogen hose 2.

[0052] Reference Fig.10 As shown, an outlet pipe 14 is fixedly installed on one side of the nitrogen detection box 10 away from the return air pipe 12, and 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 can be reused.

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

[0054] S1. Install the equipment. The staff pulls the dual-flow nitrogen hose 2 to a suitable length, then places several stable ventilation pipes 13 in the corresponding through grooves 3, and then uses tools to lift the net nitrogen drying device 6 to a suitable height. The staff uses anchors to vertically fix the lifting arc support 4 through the positioning grooves, and fix the net nitrogen drying device 6;

[0055] S2. Use of equipment. 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 a high speed so that the gas between the dual-flow nitrogen hose 2 enters 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 is reused.

[0056] The present invention uses nitrogen injection to prevent the spontaneous combustion of combustible rock and soil. In actual engineering, this method can be used to store combustible rock and soil for a long time and to achieve the purpose of repeatedly using the overlying oxygen isolation device that prevents the spontaneous combustion of combustible rock and soil, providing a more efficient and economical treatment method for storing combustible rock and soil. According to the size of the yard, multiple groups of oxygen isolation devices described in the present invention can be set to provide better use effects.

Claims

1. An overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil, characterized in that: The invention comprises two double-flow nitrogen conveying hoses (2) arranged on the upper surface of a storage yard (1), the two double-flow nitrogen conveying hoses (2) are spaced 0.5m to 3m apart and have a plurality of through grooves (3) on their outer surfaces, the through grooves (3) being distributed along the axial direction of the double-flow nitrogen conveying hoses, a plurality of through grooves (3) being movably mounted inside the plurality of through grooves (3) for stable ventilation pipes (13), a plurality of lifting arc supports (4) being fixedly mounted on the upper surface of the storage yard (1) corresponding to the double-flow nitrogen conveying hoses (2), the lifting arc supports (4) being distributed along the axial direction of the double-flow nitrogen conveying hoses and having a push rod (407) disposed inside, a groove fixing plate (5) being disposed above two lifting arc supports (4) adjacent to each other, the groove fixing plate (5) being movably connected to the push rod (407), and a nitrogen purification drying device (6) being disposed above the groove fixing plate (5).

2. The overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil according to claim 1 is characterized in that: A double-rotation receiver (7) is arranged at one end of each of the two double-flow nitrogen conveying hoses (2); a mixed gas buffer box (8) is arranged between the two double-rotation receivers (7); the mixed gas buffer box (8) is connected to the two double-rotation receivers (7) via a first connecting pipe (9); a nitrogen detection box (10) is arranged above the mixed gas buffer box (8); the nitrogen detection box (10) is connected to the mixed gas buffer box (8) via a second connecting pipe (11); and the nitrogen detection box (10) is connected to the net nitrogen drying device (6) via a return air pipe (12).

3. The overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil according to claim 1 is characterized in that: 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 fixed 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 fixed 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 fixed frame (604).

4. The overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil according to claim 3 is characterized in that: Two screw rods (607) are rotatably installed 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 arranged 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 installed 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 installed 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).

5. The overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil according to claim 1 is characterized in that: The lifting arc support (4) comprises a fixed rod (401), wherein an arc plate (402) is fixedly installed on one end of the fixed rod (401) close to the dual-flow nitrogen conveying 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 arranged 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 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.

6. The overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil according to claim 5 is characterized in that: The outer surface of the fixed rod (401) is penetrated by 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); the inner wall of the second sliding groove (410) is fixedly installed with a second guide rod (411); a sliding plate (412) is arranged inside the second sliding groove (410); 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); the two ends of the second spring (414) are respectively fixedly connected to the inner wall of the second sliding groove (410) and the side of the sliding plate (412).

7. The oxygen-isolating device for preventing spontaneous combustion of combustible rock and soil according to claim 2 is characterized in that: The double-rotation receiver (7) comprises two support plates (701), the two support plates (701) are symmetrically distributed about the center line of the dual-flow nitrogen conveying hose (2), an air intake pipe (702) is arranged between the two support plates (701), both ends of the air intake pipe (702) are rotatably connected to the support plates (701), and the air intake pipe (702) is communicated with the dual-flow nitrogen conveying hose (2), a rotating plate (703) is arranged on a 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 intake pipe (702), and a handle (704) is rotatably installed on a side of the rotating plate (703) away from the support plate (701).

8. The overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil according to claim 6 is 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.

9. The oxygen-isolating device for preventing spontaneous combustion of combustible rock and soil according to claim 2 is characterized in that: An air outlet pipe (14) is fixedly installed on a side of the nitrogen detection box (10) away from the air return pipe (12), and the air outlet pipe (14) is in communication with the nitrogen detection box (10).

10. A method for using an overlying oxygen isolation device for preventing spontaneous combustion of combustible rock and soil according to any one of claims 1 to 9, 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 stable ventilation 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 a height above the installation height using a tool; Fixing the lifting arc support (4), and fixing the lifting arc support vertically through the positioning groove using anchor nails; Fixing the net nitrogen drying device (6), lowering the net nitrogen drying device (6) using a tool and ensuring that the net nitrogen drying device (6) is fixed in place; Nitrogen delivery, where high-concentration nitrogen passes through a mixed gas buffer box (8), a first connecting pipe (9), a dual-flow nitrogen delivery hose (2) and a stable ventilation pipe (13) to protect combustible rock and soil; Gas collection, through the high-speed rotation of the fan blades, allows the gas between the two dual-flow nitrogen delivery 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 gas return pipe; Concentration detection, a nitrogen concentration detector in the nitrogen detection box (10) detects the nitrogen concentration in the gas; Discharging 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; Qualified gas is recycled. 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 is reused.

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