Carbon dioxide gas injection device for oil shale cold and hot alternating gas injection

Abstract

The application discloses a carbon dioxide gas injection device for hot alternating injection of oil shale, which comprises a bottom plate, a box body, a partition plate, heat insulation bricks, a flow divider, an electric heating pipe, a gas conveying box, a fuel tank, a gas pump, an air inlet pipe, a booster pump, a connecting pipe, a spiral pipe, an air outlet pipe, a sleeve pipe, a joint, a chamber base, an electric push rod, a connecting rod, a movable rod, a clamping block, a limiting plate, a fixing seat, a rotating shaft, a roller, a gear, a vertical plate, an oxygen conveying pipe, a fuel conveying pipe, a conveying branch pipe, a nozzle, a separation box, a backflow pump and a backflow pipe. The device is used for realizing gas conveying of hot gas in hot alternating injection of oil shale, can realize sufficient heating of the gas in the box body, can guarantee heating effect through multi-stage heating, can recycle the gas generated by combustion, is convenient to move, can be quickly connected with the joint of the chamber through movement of the sleeve pipe, and can limit the roller.

Description

Technical Field

[0001] This invention relates to a carbon dioxide gas injection device for alternating hot and cold gas injection in oil shale, specifically a carbon dioxide gas injection device for alternating hot and cold gas injection in oil shale, belonging to the technical field of oil shale mining applications. Background Technology

[0002] Oil shale is a high-ash, solid, combustible organic mineral. Low-temperature dry distillation yields shale oil with an oil content greater than 3.5% and a high organic matter content, mainly sapropelic, humic, or mixed types. Its calorific value is generally not less than 4187 J / g. Oil shale and related products can be used as fuel for power generation, heating, and transportation. The waste residue left after oil refining and power generation can be used to produce building materials, cement, and fertilizers, or for the refining of chemical products and metal extraction.

[0003] In the patent document "CN201210332743.X Oil Shale Crushing Device and Method with Alternating Hot and Cold High-Speed ​​Airflow," weathering occurs under the alternating action of hot and cold airflows, and crushing occurs under the triple action of uneven expansion and contraction caused by alternating hot and cold changes. A chamber is opened below the oil shale layer to provide sufficient space for oil shale crushing, solving the problems of poor thermal conductivity and low permeability of oil shale in existing in-situ mining processes. However, the gas needs to be heated and transported during alternating hot and cold gas injection, which consumes a lot of energy, increases economic costs, and the gas injection device is inconvenient to use, making it difficult to achieve alternating gas injection at different locations, and it is also difficult to ensure rapid connection of pipeline positions. Currently, there is no reasonably reliable carbon dioxide gas injection device for alternating hot and cold gas injection of oil shale that can achieve efficient gas heating and has portable mobility. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application employs a gas injection device to transport hot gas during alternating hot and cold gas injection in oil shale. This device enables the gas to be fully heated inside the chamber, allowing it to enter the pre-set chamber for crushing the oil shale. Simultaneously, multi-stage heating is achieved to ensure heating efficiency while preventing heat loss, thus improving energy conservation.

[0005] Furthermore, to address the problems in existing technologies, when heating gas, preheating can be achieved through electric heating tubes before fuel combustion heating, and the gases produced during combustion can be recovered and reused, which is beneficial for energy conservation and environmental protection.

[0006] Furthermore, to address the problems in the existing technology: during the gas injection operation, the device can be easily moved, and can be quickly connected to the joint of the chamber through the movement of the sleeve, facilitating gas delivery. At the same time, it can limit the rollers, effectively ensuring their stability and improving the efficiency of use.

[0007] To address the shortcomings of existing technologies, this application provides a carbon dioxide gas injection device for alternating hot and cold gas injection in oil shale, comprising: a base plate, a housing, a partition, and a gas delivery box; wherein, the housing is fixedly installed on the surface of the base plate, the interior of the housing is fixedly connected to the partition, both the partition and the inner wall of the housing are provided with heat-insulating bricks, and several diversion plates are provided above the partition, with several electric heating tubes between adjacent diversion plates; the gas delivery box, fuel tank, and separation box are fixedly installed on both sides of the housing, respectively; a booster pump is provided on one side of the separation box, and the booster pump is fixedly connected to a connecting pipe and a spiral pipe. The spiral tube is fixedly installed to the bottom of the box, and the spiral tube is distributed in an S-shape. One end of the spiral tube is connected to the air outlet pipe, and the air outlet pipe is connected to the box and the bottom plate respectively. A limit plate is fixedly installed at the bottom of the bottom plate. The limit plate is slidably connected to the movable rod inside. One end of the movable rod is fixedly connected to a locking block, and the other end of the movable rod is connected to the sleeve through a connecting rod. The bottom end of the sleeve is fixedly connected to an electric push rod. The electric push rod is fixedly installed to the bottom surface of the bottom plate. The sleeve and the joint are sealed and fitted together, and the joint is fixedly installed to the top of the gas injection pipeline for alternating gas injection of oil shale.

[0008] Furthermore, the gas delivery box is fixedly connected to the fuel tank, and an air pump is fixedly installed on the top of the gas delivery box. The top of the air pump is fixedly connected to the air inlet pipe, and the top of the air inlet pipe is connected through the box body. The top of the air inlet pipe is correspondingly positioned above the diverter plate.

[0009] Furthermore, the box body has horizontally distributed partitions in the middle, and two horizontally distributed diversion plates are provided on the top of the partitions. The two diversion plates are staggered. Several electric heating tubes are fixedly installed on the inner wall of the box body. The several electric heating tubes are evenly distributed between the diversion plates. A gas delivery box and a fuel tank are respectively provided on one side of the box body.

[0010] Furthermore, the bottom plate is fixedly installed with the booster pump, the booster pump is connected to the air outlet pipe through a spiral tube, the spiral tube is located below the partition, the inside of the box is fixedly connected to the vertical plate, and an oxygen delivery pipe and a fuel delivery pipe are respectively provided on one side of the vertical plate.

[0011] Furthermore, both the oxygen delivery pipe and the fuel delivery pipe are connected to the delivery branch pipe, which is fixedly connected to the inner wall of the box. Each delivery branch pipe is provided with several nozzles, and each nozzle is correspondingly located below the spiral tube.

[0012] Furthermore, the bottom of the base plate is fixedly installed with the fixed seat, the fixed seat is rotatably connected to the rotating shaft, and rollers are fixedly installed at both ends of the rotating shaft. The middle part of one of the rotating shafts is fixedly connected to a gear. A U-shaped limiting plate is provided on one side of the gear. The bottom surface of the base plate slides in contact with the movable rod. A locking block is vertically distributed at one end of the movable rod. The locking block engages with the gear, and the movable rod is located between the base plate and the gear.

[0013] Furthermore, the bottom of the base plate is provided with two symmetrically distributed electric push rods, which are symmetrically distributed to both sides of the sleeve. The sleeve is movably sleeved with the surface of the air outlet pipe. An inclined connecting rod is provided on one side of the bottom end of the sleeve. The air outlet pipe is sealed to the sleeve, and the bottom of the sleeve is sealed to the joint. The joint is fixedly installed inside the chamber base. The middle of the chamber base is provided with a chamber that matches the joint.

[0014] Furthermore, a separation box and a booster pump are provided on one side of the box body. The connecting pipe at the top of the booster pump is correspondingly located above the partition. The separation box is connected to the box body. The connection between the separation box and the box body is located below the partition. The side wall of the separation box is fixedly connected to the return pump. The return pump is fixedly connected to the return pipe. The return pipe is connected to the bottom of the gas delivery box.

[0015] Furthermore, the interior of the housing is fixedly connected to an oxygen delivery pipe and a fuel delivery pipe, respectively. The oxygen delivery pipe is fixedly connected to an air delivery pump, and the fuel delivery pipe is fixedly connected to a fuel tank. The fuel delivery pipe and the oxygen delivery pipe are located on the same side of the vertical plate, and the vertical plate is connected through the delivery branch pipe.

[0016] Furthermore, a molecular sieve is fixedly installed inside the separation chamber to facilitate the separation of carbon dioxide gas and other gases, and the separation chamber is connected to the gas delivery chamber through a reflux pipe.

[0017] The advantages of this application are: it provides a carbon dioxide gas injection device for alternating hot and cold gas injection in oil shale, which has a reasonable and reliable structure, can achieve efficient gas heating, and is portable. The device uses an injection unit to transport hot gas during alternating hot and cold gas injection in oil shale, and can fully heat the gas inside the housing. This allows the gas to enter the pre-set chamber for oil shale crushing. Multi-stage heating is possible to ensure heating effect while preventing heat loss, thus improving energy efficiency. During gas heating, preheating is achieved through electric heating tubes before fuel combustion heating. The combustion gases can be recovered and reused, contributing to energy conservation and environmental protection. During injection, the device is easily movable and can be quickly connected to the chamber joint via the movement of the sleeve, facilitating gas delivery. The rollers are also limited to ensure stability and improve efficiency. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0019] Figure 1 This is a schematic diagram of a carbon dioxide gas injection device for alternating hot and cold gas injection in oil shale, according to one embodiment of this application;

[0020] Figure 2 yes Figure 1 The diagram shows a first-view structure in the embodiment shown.

[0021] Figure 3 yes Figure 2 The schematic diagram of the side view of the housing in the embodiment shown;

[0022] Figure 4 yes Figure 2 A three-dimensional structural diagram of the box in the embodiment shown;

[0023] Figure 5 yes Figure 2 The diagram shown is a top view of the casing structure in the embodiment shown.

[0024] Figure 6 yes Figure 2 In the illustrated embodiment Figure 2 A magnified view of the structure at point A in the middle;

[0025] Figure 7 yes Figure 2 The schematic diagram of the bottom plate structure in the embodiment shown is a top view.

[0026] Figure 8 yes Figure 2 A three-dimensional structural diagram of the spiral tube in the illustrated embodiment;

[0027] Figure 9 yes Figure 2 A three-dimensional structural diagram of the sleeve in the embodiment shown;

[0028] Figure 10 yes Figure 2 A three-dimensional structural diagram of the movable rod in the embodiment shown.

[0029] Meaning of the reference numerals in the diagram:

[0030] 1. Base plate, 2. Box body, 3. Partition plate, 4. Insulating brick, 5. Diverter plate, 6. Electric heating tube, 7. Gas delivery box, 8. Fuel tank, 9. Air pump, 10. Inlet pipe, 11. Booster pump, 12. Connecting pipe, 13. Spiral pipe, 14. Outlet pipe, 15. Sleeve, 16. Joint, 17. Chamber base, 18. Electric push rod, 19. Connecting rod, 20. Movable rod, 21. Locking block, 22. Limiting plate, 23. Fixed seat, 24. Rotating shaft, 25. Roller, 26. Gear, 27. Vertical plate, 28. Oxygen delivery pipe, 29. Fuel delivery pipe, 30. Delivery branch pipe, 31. Nozzle, 32. Separation box, 33. Return pump, 34. Return pipe. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0034] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0035] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] Reference Figures 1 to 10 The carbon dioxide gas injection device for alternating hot and cold gas injection of oil shale includes: a base plate 1, a box body 2, a partition plate 3, and a gas delivery box 7.

[0038] Reference Figures 1 to 10As a preferred embodiment, a housing 2 is fixedly installed on the surface of the base plate 1. The interior of the housing 2 is fixedly connected to a partition 3. Both the partition 3 and the inner wall of the housing 2 are provided with heat-insulating bricks 4, which can prevent the dissipation of heat inside the housing 2. The gas entering the housing 2 is heated by electric heating tubes 6 and then transported through connecting pipes 12 and spiral pipes 13. At the same time, a flow divider 5 is provided to increase the residence time of the gas inside the housing 2, so as to achieve sufficient heating of the gas. Several flow dividers 5 are provided above the partition 3, and several electric heating tubes 6 are provided between adjacent flow dividers 5. The housing 2 is fixedly installed with a gas delivery box 7, a fuel tank 8, and a separation box 32 on both sides, respectively. A booster pump 11 is provided on one side. The booster pump 11 is used to pressurize the gas and deliver it into the spiral tube 13. The booster pump 11 is fixedly connected to the connecting pipe 12 and the spiral tube 13 respectively. The spiral tube 13 is fixedly installed at the bottom of the box 2 and the spiral tube 13 is distributed in an S-shape. The spiral tube 13 achieves further heating while delivering the gas. At the same time, setting the spiral tube 13 in an S-shape can increase the heating area and improve the heating effect. One end of the spiral tube 13 is connected to the gas outlet pipe 14. The gas outlet pipe 14 is connected to the box 2 and the bottom plate 1 respectively. The heated gas is discharged through the gas outlet pipe 14 and the sleeve 15. The connection between the sleeve 15 and the connector 16 realizes the gas delivery.

[0039] Reference Figure 2 , Figure 7 and Figure 10 As a specific solution, a limiting plate 22 is fixedly installed at the bottom of the base plate 1. The limiting plate 22 is slidably connected to the movable rod 20 inside. One end of the movable rod 20 is fixedly connected to a locking block 21, and the other end of the movable rod 20 is connected to the sleeve 15 through a connecting rod 19. The bottom end of the sleeve 15 is fixedly connected to an electric push rod 18. The electric push rod 18 is fixedly installed on the bottom surface of the base plate 1. The sleeve 15 is sealed and fitted to the joint 16, and the joint 16 is fixedly installed at the top of the gas injection pipeline for alternating gas injection of oil shale. The limiting plate 22 is used to limit the movable rod 20, so that the movable rod 20 can move between the limiting plate 22 and the base plate 1. The movable rod 20 can drive the locking block 21 to engage with the gear 26 on the rotating shaft 24, thereby realizing the limiting of the gas injection device. The electric push rod 18 drives the sleeve 15 to move and connect with the joint 16. The limiting of the gas injection device is realized through the connection of the connecting rod 19, which is beneficial to improving the construction stability.

[0040] Reference Figures 1 to 2 as well as Figure 5In this configuration, the gas delivery box 7 is fixedly connected to the fuel tank 8. An air pump 9 is fixedly installed on the top of the gas delivery box 7. The top of the air pump 9 is fixedly connected to the air inlet pipe 10, and the top of the air inlet pipe 10 is connected through the box body 2. The top of the air inlet pipe 10 is positioned above the diverter plate 5. The fuel tank 8 is used to store fuel and deliver it through the fuel delivery pipe 29. This allows the fuel to burn inside the box body 2 to heat the gas in the spiral tube 13. The gas delivery box 7 is used to store carbon dioxide gas to prevent any danger during the gas heating process. The gas is delivered to the inside of the box body 2 through the air inlet pipe 10 by the air pump 9 for heating treatment.

[0041] Reference Figures 2 to 4 As an extension, the box 2 has horizontally distributed partitions 3 in the middle, and two horizontally distributed diversion plates 5 are provided on the top of the partitions 3. The two diversion plates 5 are staggered. Several electric heating tubes 6 are fixedly installed on the inner wall of the box 2. The electric heating tubes 6 are evenly distributed between the diversion plates 5. A gas delivery box 7 and a fuel tank 8 are respectively provided on one side of the box 2. The electric heating tubes 6 are used to initially heat the air flowing through them. When the air is pressurized and delivered by the booster pump 11, it is further heated by the fuel delivered in the fuel tank 8 at the bottom of the box 2.

[0042] Reference Figures 1 to 5 In this configuration, the bottom plate 1 is fixedly installed on the surface of the booster pump 11, and the booster pump 11 is connected to the air outlet pipe 14 through the spiral tube 13. The spiral tube 13 is located below the partition plate 3. The interior of the housing 2 is fixedly connected to the vertical plate 27. An oxygen delivery pipe 28 and a fuel delivery pipe 29 are respectively provided on one side of the vertical plate 27. The oxygen delivery pipe 28 is used to deliver combustible air, so that the air and fuel are mixed and burned inside the housing 2 to heat the spiral tube 13.

[0043] Reference Figure 2 , Figure 4 , Figure 6 and Figure 8 As a specific embodiment, both the oxygen delivery pipe 28 and the fuel delivery pipe 29 are connected to the delivery branch pipe 30. The delivery branch pipe 30 is fixedly connected to the inner wall of the housing 2, and each delivery branch pipe 30 is provided with several nozzles 31. Each nozzle 31 is correspondingly located below the spiral pipe 13. The oxygen delivery pipe 28 and the fuel delivery pipe 29 respectively deliver air and fuel to the delivery branch pipe 30 and spray them out through multiple nozzles 31, thereby heating each position of the spiral pipe 13. This allows the injected gas to be fully heated and then delivered to the fissures of the oil shale. After the gas is delivered, the hot gas delivery is stopped, and then cold air is delivered from the other side of the fissure. Through the alternation of hot and cold air, larger fissures are created in the oil shale to facilitate subsequent mining.

[0044] Reference Figures 1 to 3 , Figure 7 as well as Figure 10 As a specific embodiment, the bottom of the base plate 1 is fixedly installed with the fixed seat 23. The fixed seat 23 is rotatably connected to the rotating shaft 24. Rollers 25 are fixedly installed at both ends of the rotating shaft 24. The middle part of one of the rotating shafts 24 is fixedly connected to the gear 26. A U-shaped limiting plate 22 is provided on one side of the gear 26. The bottom surface of the base plate 1 slides against the movable rod 20. A locking block 21 is vertically distributed at one end of the movable rod 20. The locking block 21 engages with the gear 26. The movable rod 20 is located between the base plate 1 and the gear 26. The fixed seat 23 is used for the rotation of the rollers 25 of the rotating shaft 24. The rotating shaft 24 can drive the gear 26 to rotate synchronously. When the sleeve 15 moves and connects with the connector 16, it can drive the locking block 21 to engage with the gear 26 to achieve limiting.

[0045] Reference Figure 2 and Figures 6 to 7 as well as Figure 9 As an extension, the bottom of the base plate 1 is provided with two symmetrically distributed electric push rods 18, which are symmetrically distributed on both sides of the sleeve 15. The sleeve 15 is movably sleeved with the surface of the vent pipe 14. One side of the bottom end of the sleeve 15 is provided with an inclined connecting rod 19. The vent pipe 14 is sealed to the sleeve 15, and the bottom of the sleeve 15 is sealed to the joint 16. The joint 16 is fixedly installed inside the chamber base 17, and the middle of the chamber base 17 has an opening. The chamber that matches the connector 16 is opened at the ground position of the oil shale. After the chamber is opened, the chamber base 17 is installed at the outlet position to facilitate the installation of the connector 16. After the gas injection device is moved, the connector 16 can be aligned with the sleeve 15. The pipeline connection for gas transportation is realized by the extension and retraction of the electric push rod 18. After the construction is completed, the sleeve 15 and the connector 16 are separated by the retraction of the electric push rod 18. At this time, the locking block 21 and the gear 26 are separated at the same time, which facilitates the movement of the gas injection device.

[0046] Reference Figures 1 to 2 and Figure 5As an extension, a separation box 32 and a booster pump 11 are provided on one side of the housing 2. The connecting pipe 12 at the top of the booster pump 11 is correspondingly arranged above the partition 3. The separation box 32 is connected to the housing 2, and the connection between the separation box 32 and the housing 2 is located below the partition 3. The side wall of the separation box 32 is fixedly connected to the return pump 33, and the return pump 33 is fixedly connected to the return pipe 34. The return pipe 34 is connected to the bottom of the gas delivery box 7. The booster pump 11 is used to pressurize and deliver the alternately injected carbon dioxide gas. The carbon dioxide gas generated by combustion inside the housing 2 enters the separation box 32. After separation, the carbon dioxide gas is delivered to the gas delivery box 7 for storage through the return pump 33 and the return pipe 34, which helps to improve the energy-saving effect.

[0047] Reference Figures 2 to 5 In this configuration, the interior of the housing 2 is fixedly connected to the oxygen delivery pipe 28 and the fuel delivery pipe 29, respectively. The oxygen delivery pipe 28 is fixedly connected to the air delivery pump, and the fuel delivery pipe 29 is fixedly connected to the fuel tank 8. The fuel delivery pipe 29 and the oxygen delivery pipe 28 are located on the same side of the vertical plate 27, and the vertical plate 27 is connected through the delivery branch pipe 30. The vertical plate 27 is used to separate the two sides of the bottom of the housing 2, which facilitates the installation of the air delivery pipe and the fuel delivery pipe 29, so that the gas and air can be delivered to the bottom of the housing 2 for complete combustion.

[0048] Reference Figures 1 to 2 as well as Figure 5 In this scheme, a molecular sieve is fixedly installed inside the separation box 32 to facilitate the separation of carbon dioxide gas and other gases. The separation box 32 is connected to the gas delivery box 7 through the return pipe 34. The separation box 32 is used to separate carbon dioxide gas and other gases in the combustion gas, so that pure carbon dioxide gas can be delivered to the gas delivery box 7 through the return pipe 34 for use.

[0049] The technical solution of this application uses a gas injection device to transport hot gas during the alternating hot and cold gas injection of oil shale. The carbon dioxide gas is stored in the gas delivery box 7. The gas is pumped from the inlet pipe 10 into the box 2 by the gas pump 9. When the gas flows through the diverter plate 5, it is preheated by the electric heating tube 6. The gas is then transported to the spiral tube 13 through the connecting pipe 12 by the booster pump 11 and pressurized. At the same time, fuel is transported to the fuel delivery pipe 29 by the fuel tank 8 and air is transported to the oxygen delivery pipe 28. The fuel and oxygen are transported simultaneously by the delivery branch pipe 30 and sprayed out through the nozzle 31. The gas is ignited at the bottom of the box 2 and then heated by the spiral tube 13. Finally, the gas is discharged through the outlet to achieve the transport of hot gas.

[0050] The gas injection device moves by rotating the roller 25 and the rotating shaft 24. When the rotating shaft 24 rotates inside the fixed base 23, it simultaneously drives the gear 26 to rotate. The extension of the electric push rod 18 drives the sleeve 15 to move at the gas outlet pipe 14, so that the sleeve 15 fits with the joint 16 installed on the chamber base 17 to achieve a seal at the connection. During the downward movement of the sleeve 15, it drives the connecting rod 19 to rotate, so that the connecting rod 19 pulls the movable rod 20 to move inside the limiting plate 22, and drives the locking block 21 to move horizontally and then engage with the gear 26, thereby limiting the gas injection device. This allows the injection of gas after heating inside the box 2. The carbon dioxide gas generated by combustion inside the box 2 is transported to the separation box 32. After the separation box 32 separates the carbon dioxide gas, it is transported to the gas delivery box 7 through the return pump 33 and the return pipe 34, which can make full use of the carbon dioxide gas.

[0051] The above are merely specific embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A carbon dioxide gas injection device for alternating hot and cold gas injection in oil shale, characterized in that: The carbon dioxide gas injection device for alternating hot and cold gas injection of oil shale includes: a base plate (1), a box body (2), a partition plate (3) and a gas delivery box (7). Among them, a box (2) is fixedly installed on the surface of the bottom plate (1), and the inside of the box (2) is fixedly connected to the partition (3). The partition (3) and the inner wall of the box (2) are provided with heat insulation bricks (4), and several diversion plates (5) are provided above the partition (3). Several electric heating tubes (6) are provided between adjacent diversion plates (5). The two sides of the box (2) are fixedly installed with a gas conveying box (7), a fuel tank (8) and a separation box (32) respectively. A booster pump (11) is provided on one side of the separation box (32). The booster pump (11) is fixedly connected to a connecting pipe (12) and a spiral pipe (13) respectively. The spiral pipe (13) is fixedly installed to the bottom of the box (2), and the spiral pipe (13) is distributed in an S-shaped structure. One end of the spiral pipe (13) is connected to the gas outlet pipe (14). The gas outlet pipe (14) is connected to the box (2) and the bottom plate (1) respectively. A limiting plate (22) is fixedly installed at the bottom of the base plate (1). The limiting plate (22) is slidably connected to the movable rod (20). One end of the movable rod (20) is fixedly connected to a locking block (21), and the other end of the movable rod (20) is connected to the sleeve (15) through a connecting rod (19). The bottom end of the sleeve (15) is fixedly connected to an electric push rod (18). The electric push rod (18) is fixedly installed on the bottom surface of the base plate (1). The sleeve (15) is sealed and fitted to the joint (16), and the joint (16) is fixedly installed at the top of the gas injection pipeline for alternating gas injection of oil shale. The bottom plate (1) is fixedly installed with the booster pump (11). The booster pump (11) is connected to the air outlet pipe (14) through the spiral tube (13). The spiral tube (13) is located below the partition plate (3). The inside of the box (2) is fixedly connected to the vertical plate (27). An oxygen delivery pipe (28) and a fuel delivery pipe (29) are respectively provided on one side of the vertical plate (27). The oxygen delivery pipe (28) and the fuel delivery pipe (29) are both connected to the delivery branch pipe (30). The delivery branch pipe (30) is fixedly connected to the inner wall of the box (2). Each delivery branch pipe (30) is provided with several nozzles (31). Each nozzle (31) is correspondingly located below the spiral tube (13). The box (2) is provided with a separation box (32) and a booster pump (11) on one side. The connecting pipe (12) at the top of the booster pump (11) is correspondingly set above the partition (3). The separation box (32) is connected to the box (2). The carbon dioxide gas generated by combustion inside the box (2) is transported to the separation box (32). After the separation box (32) separates the carbon dioxide gas, it is transported to the gas delivery box (7) through the return pump (33) and the return pipe (34). The connection between the separation box (32) and the box (2) is located below the partition (3). The side wall of the separation box (32) is fixedly connected to the return pump (33). The return pump (33) is fixedly connected to the return pipe (34). The return pipe (34) is connected to the bottom of the gas delivery box (7).

2. The carbon dioxide gas injection device for alternating hot and cold gas injection in oil shale according to claim 1, characterized in that: The gas delivery box (7) is fixedly connected to the fuel tank (8). A gas pump (9) is fixedly installed on the top of the gas delivery box (7). The top of the gas pump (9) is fixedly connected to the air inlet pipe (10), and the top of the air inlet pipe (10) is connected through the box body (2). The top of the air inlet pipe (10) is correspondingly set above the diverter plate (5).

3. The carbon dioxide gas injection device for alternating hot and cold gas injection in oil shale according to claim 1, characterized in that: The box (2) has a horizontally distributed partition (3) in the middle, and two horizontally distributed diversion plates (5) are provided on the top of the partition (3). The two diversion plates (5) are staggered. Several electric heating tubes (6) are fixedly installed on the inner wall of the box (2). The several electric heating tubes (6) are evenly distributed between the diversion plates (5). A gas delivery box (7) and a fuel tank (8) are respectively provided on one side of the box (2).

4. A carbon dioxide gas injection device for alternating hot and cold gas injection in oil shale according to claim 1, characterized in that: The bottom of the base plate (1) is fixedly installed with the fixed seat (23). The fixed seat (23) is rotatably connected to the rotating shaft (24). Rollers (25) are fixedly installed at both ends of the rotating shaft (24). The middle part of one of the rotating shafts (24) is fixedly connected to the gear (26). A U-shaped limiting plate (22) is provided on one side of the gear (26). The bottom surface of the base plate (1) slides against the movable rod (20). A locking block (21) is vertically distributed at one end of the movable rod (20). The locking block (21) engages with the gear (26). The movable rod (20) is located between the base plate (1) and the gear (26).

5. A carbon dioxide gas injection device for alternating hot and cold gas injection in oil shale according to claim 1, characterized in that: The bottom of the base plate (1) is provided with two symmetrically distributed electric push rods (18). The electric push rods (18) are symmetrically distributed to both sides of the sleeve (15). The sleeve (15) is movably sleeved with the surface of the air outlet pipe (14). The bottom end of the sleeve (15) is provided with an inclined connecting rod (19). The air outlet pipe (14) is sealed to the sleeve (15). The bottom of the sleeve (15) is sealed to the joint (16). The joint (16) is fixedly installed inside the chamber base (17). The middle part of the chamber base (17) is provided with a chamber that matches the joint (16).

6. A carbon dioxide gas injection device for alternating hot and cold gas injection in oil shale according to claim 1, characterized in that: The box (2) is fixedly connected to the oxygen delivery pipe (28) and the fuel delivery pipe (29) respectively. The oxygen delivery pipe (28) is fixedly connected to the air delivery pump, and the fuel delivery pipe (29) is fixedly connected to the fuel tank (8). The fuel delivery pipe (29) and the oxygen delivery pipe (28) are located on the same side of the vertical plate (27), and the vertical plate (27) is connected through the delivery branch pipe (30).

7. A carbon dioxide gas injection device for alternating hot and cold gas injection in oil shale according to claim 1, characterized in that: The separation box (32) is equipped with a molecular sieve to facilitate the separation of carbon dioxide gas and other gases. The separation box (32) is connected to the gas delivery box (7) through a return pipe (34).

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