Positive temperature electromagnetic frequency conversion induction underground heating device for in-situ conversion of oil shale

Abstract

The application belongs to the technical field of petroleum chemical industry, in particular to a positive temperature electromagnetic frequency conversion induction underground heating device for oil shale hydrocarbon generation in-situ conversion, which comprises an electromagnetic frequency converter, a temperature monitoring system and an underground heating assembly; the underground heating assembly comprises a heater; a pair of mounting rings are fixedly connected inside the heater; an induction coil is fixedly connected between the mounting rings; the induction coil is made of barium titanate composite material and tungsten alloy material; an iron core is arranged inside the induction coil; and a hollow rod is fixedly connected to the top of the heater. The device realizes the in-situ rapid conversion of oil shale underground by adopting efficient electromagnetic induction technology and an optimized heating control strategy, can improve the thermal cracking efficiency of oil shale, greatly reduce the environmental impact and operation cost, and avoid the safety risks caused by fuel leakage.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of petrochemical industry, and particularly relates to a positive temperature electromagnetic frequency conversion induction underground heating device for oil shale hydrocarbon generation in-situ conversion. BACKGROUND

[0002] Oil shale is a type of sedimentary rock that contains exploitable organic matter, and its main component is rock containing a large amount of organic matter. These organic matters can be converted into liquid petroleum or gas under certain conditions through pyrolysis (heating to a certain temperature). As a potential energy source, oil shale has abundant resource reserves, but its exploitation and extraction technology still faces the challenges of high cost and environmental problems. Oil shale pyrolysis can be divided into above-ground pyrolysis and underground pyrolysis. Underground pyrolysis, also known as in-situ conversion, refers to the process of directly heating and dry distillation of oil shale buried underground without mining, and then guiding the produced oil and gas to the ground. In-situ conversion has the advantages of high resource utilization rate, small environmental impact, and high economic benefits compared to above-ground pyrolysis.

[0003] A patent of Chinese patent application CN104612642B discloses an in-well oil shale layer combustion heating system. The technical solution points of the system are: including a ground monitoring and control system, an in-well combustion and tail gas countercurrent heat exchange system, an external fluid injection pipe, and an external casing. During operation of the system, fuel is combusted in a sealed combustion chamber through the burner casing, without direct contact with the underground external formation environment. The system can be used as a heating body to directly heat the underground formation, or can heat an externally added fluid medium in the well to perform permeation heat and mass transfer to the formation, and can realize hot gas extraction, superheated steam extraction, and near / supercritical fluid extraction of the formation. The system can be used for in-situ conversion and extraction of organic matter in oil shale reservoirs.

[0004] However, the above-mentioned technology often has the following defects: the heating system has a relatively complex structure, and its heating process relies on the combustion of fuel, which not only has low thermal efficiency and high energy consumption, but also has the risk of fuel leakage during transportation and combustion. The quality requirements for equipment are high, and safety accidents such as explosion and poisoning are easy to occur. In addition, if the tail gas formed after combustion is not properly treated, it will also cause environmental pollution.

[0005] Therefore, the present application provides a positive temperature electromagnetic frequency conversion induction underground heating device for oil shale hydrocarbon generation in-situ conversion. SUMMARY

[0006] In order to make up for the deficiencies of the prior art and solve at least one technical problem raised in the background art.

[0007] The oil shale hydrocarbon generation in-situ conversion positive temperature electromagnetic frequency conversion underground heating device provided by the application comprises an electromagnetic frequency converter, a temperature monitoring system and an underground heating assembly.

[0008] The electromagnetic frequency converter can adjust the output frequency to adapt to different stratum conditions.

[0009] The temperature monitoring system can monitor the heating temperature in real time, so that the heating process can be carried out at the optimal temperature.

[0010] The underground heating assembly comprises a heater, a pair of mounting rings fixedly connected inside the heater, an induction coil fixedly connected between the mounting rings, a columnar iron core arranged inside the induction coil, and a hollow rod fixedly connected to the top of the heater.

[0011] Preferably, a hollow conical cover is arranged above the iron core inside the heater, a group of spray holes are uniformly distributed on the inner side of the conical cover, a water pipe is arranged inside the hollow rod and extends to the inside of the heater and communicates with the conical cover, and a group of release holes are uniformly distributed on the surface of the heater.

[0012] Preferably, a plugging block is arranged on the outside of the top of the hollow rod.

[0013] Preferably, a pressure relief port is arranged below the plugging block on the top of the hollow rod, and a pressure relief valve is arranged inside the pressure relief port.

[0014] Preferably, a gas guide piece is arranged between the outside of the water pipe and the inside of the hollow rod and located above the pressure relief port, and the gas guide piece is designed in the shape of a spiral disc.

[0015] Preferably, a cavity is arranged inside the iron core, the water pipe and the cavity communicate with each other through a shunt pipe, and a group of guide holes are uniformly distributed on the surface of the iron core.

[0016] Preferably, a group of water blocking plates are uniformly distributed inside the cavity and are concave downward, the water blocking plates are made of a good heat conducting material, a group of through holes are uniformly distributed on the surface of the water blocking plates, and the through holes of adjacent water blocking plates are misaligned with each other.

[0017] Preferably, a group of fins are uniformly distributed on the upper side of the water blocking plates, the fins are made of a good heat conducting material, and an elastic member is fixedly connected between the fins and the water blocking plates.

[0018] Preferably, the iron core surface is uniformly distributed with a group of annular water stop valves; the water stop valves are made of benign heat-conducting materials; the water stop valves and the iron core form an included angle; the water stop valves are fixedly connected with annular water guide pieces outside; and the water guide pieces cover the top of the water stop valves and form a gap between the water guide pieces and the water stop valves.

[0019] Preferably, the iron core lower side is fixedly connected with a water containing cap; and a gap is formed between the water containing cap and the iron core bottom.

[0020] The beneficial effects of the present application are as follows:

[0021] 1. The oil shale hydrocarbon generation in-situ conversion positive temperature electromagnetic frequency conversion induction underground heating device utilizes the hollow rod to lower the heater to the oil shale position inside the working well, generates induction current in the iron core and generates a large amount of heat by energizing the induction coil, thereby heating the surrounding oil shale. The device realizes the rapid in-situ conversion of oil shale underground by adopting efficient electromagnetic induction technology and optimized heating control strategy, can improve the thermal cracking efficiency of oil shale, greatly reduce the environmental impact and operation cost, and avoid the safety risks brought by fuel leakage.

[0022] 2. The oil shale hydrocarbon generation in-situ conversion positive temperature electromagnetic frequency conversion induction underground heating device connects the water pipe with the external water source, and when working, the water flows into the conical cover inside along the water pipe, and is sprayed towards the top of the iron core through the spray hole inside the conical cover. After the water contacts with the surface of the iron core, it is quickly evaporated and vaporized by the heat of the iron core, generating a large amount of water vapor. The water vapor escapes through the release hole on the surface of the heater, thereby improving the heating uniformity of the oil shale. The high-pressure water vapor is beneficial to fracturing the surrounding rock and soil, so that many small cracks are generated in the oil shale, and then the water vapor can enter the inside of the oil shale along these cracks to heat, thereby further improving the cracking efficiency of the oil shale and being beneficial to the collection of oil and gas resources.

[0023] 3. The oil shale hydrocarbon generation in-situ conversion positive temperature electromagnetic frequency conversion induction underground heating device sets a pressure relief port and a pressure relief valve. When the pressure inside the working well reaches a certain threshold value, the pressure relief valve is automatically opened, the gas enters the hollow rod inside through the pressure relief port and flows upwards to the outside of the well, thereby relieving the pressure of the working well, preventing the risk of explosion caused by excessive pressure, and the high-temperature water vapor can contact with the water pipe during the upward flow in the hollow rod, and the flow direction of the water in the water pipe is opposite, thereby preheating the water in the water pipe to a certain temperature, and then the water can be quickly vaporized when it contacts with the iron core, thereby improving the generation efficiency of water vapor. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a perspective view of the present invention;

[0026] Figure 2 yes Figure 1 Enlarged view of a portion of point A in the middle;

[0027] Figure 3 This is a schematic diagram of the structure of the induction coil in this invention;

[0028] Figure 4 yes Figure 3 Enlarged view of a section at point B in the middle;

[0029] Figure 5 This is a schematic diagram of the iron core structure in this invention;

[0030] Figure 6 This is a cross-sectional view of the present invention;

[0031] Figure 7 yes Figure 6 Enlarged view of a section at point C;

[0032] Figure 8 yes Figure 7 Enlarged view of a section at point D.

[0033] In the diagram: 1. Working well; 2. Heater; 3. Mounting ring; 4. Induction coil; 5. Iron core; 6. Hollow rod; 7. Conical cover; 8. Spray hole; 9. Water pipe; 10. Release hole; 11. Sealing block; 12. Pressure relief port; 13. Air guide plate; 14. Cavity; 15. Diverter pipe; 16. Guide hole; 17. Water blocking plate; 18. Through hole; 19. Fin; 20. Elastic element; 21. Water stop valve; 22. Water guide plate; 23. Water holding cap. Detailed Implementation

[0034] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0035] like Figures 1 to 8 As shown, the positive temperature electromagnetic frequency conversion induction underground heating device for in-situ conversion of oil shale hydrocarbon generation according to the present invention includes an electromagnetic frequency converter, a temperature monitoring system and an underground heating component.

[0036] The electromagnetic frequency converter can adjust the output frequency to adapt to different geological conditions.

[0037] The temperature monitoring system monitors the heating temperature in real time to ensure that the heating process is carried out at the optimal temperature. The temperature monitoring system uses a positive temperature coefficient thermistor (PTC) to automatically adjust the heating power, eliminating the need for an external temperature control system.

[0038] The underground heating assembly comprises a heater 2; a pair of mounting rings 3 are fixedly connected inside the heater 2; an induction coil 4 is fixedly connected between the mounting rings 3; the induction coil 4 is made of barium titanate composite material and tungsten alloy material, so that rapid heating and high heating efficiency are realized; a columnar iron core 5 is arranged inside the induction coil 4; and a hollow rod 6 is fixedly connected to the top of the heater 2.

[0039] The prior art oil shale in-situ heating system has a relatively complex structure, and its heating process depends on the combustion of fuel, which is not only low in thermal efficiency and high in energy consumption, but also has the risk of fuel leakage in the process of transportation and combustion, is high in requirement for the quality of equipment, is prone to safety accidents such as explosion and poisoning, and if the tail gas formed after combustion is not properly treated, environmental pollution will also occur.

[0040] In use, the hollow rod 6 is used to lower the heater 2 to the position of oil shale inside the working well 1, the induction coil 4 is energized to generate induced current inside the iron core 5 and generate a large amount of heat, so as to heat the surrounding oil shale, the device realizes rapid conversion of oil shale in-situ underground by using efficient electromagnetic induction technology and optimized heating control strategy, can improve the thermal cracking efficiency of oil shale, greatly reduce the environmental impact and operation cost, and avoid the safety risk caused by fuel leakage.

[0041] A hollow conical cover 7 is arranged at the position above the iron core 5 inside the heater 2; a group of spray holes 8 are uniformly distributed on the inner side of the conical cover 7; a water pipe 9 is arranged inside the hollow rod 6, and the lower end of the water pipe 9 extends into the heater 2 and is in communication with the conical cover 7; a group of release holes 10 are uniformly distributed on the surface of the heater 2. By connecting the water pipe 9 with an external water source, water flows into the conical cover 7 along the water pipe 9 during work, and is sprayed towards the top of the iron core 5 through the spray holes 8 on the inner side of the conical cover 7, the water is rapidly evaporated and vaporized after contacting the surface of the iron core 5, a large amount of water vapor is generated, and the water vapor escapes through the release holes 10 on the surface of the heater 2 to heat the oil shale, thereby improving the uniformity of heating the oil shale, and the high-pressure water vapor is beneficial to fracturing the surrounding rock and soil, so that many small cracks are generated in the oil shale, and then the water vapor can enter the inside of the oil shale along these cracks to heat, thereby further improving the cracking efficiency of the oil shale and being beneficial to the collection of oil and gas resources.

[0042] As a preferred embodiment of the present application, a plugging block 11 is arranged on the outside of the top of the hollow rod 6. After the heater 2 is lowered to the appropriate position, the plugging block 11 is sleeved on the outside of the hollow rod 6 and plugged into the inside of the working well 1, so as to plug the working well 1, which can reduce the heat loss to the outside during the heating process, and make the water vapor generated in the inside of the working well 1 quickly form a high-pressure environment, thereby improving the heating and fracturing efficiency of the oil shale.

[0043] As a preferred embodiment of the present application, the hollow rod 6 is provided with a pressure relief port 12 at a position below the blocking block 11; the pressure relief port 12 is internally provided with a pressure relief valve. By providing the pressure relief port 12 and the pressure relief valve, when the pressure inside the working well 1 reaches a certain threshold value, the pressure relief valve is automatically opened, and the gas enters the inside of the hollow rod 6 through the pressure relief port 12 and flows upward to the outside of the well, thereby relieving the pressure of the working well 1, preventing the risk of explosion due to excessive pressure, and in addition, the high-temperature water vapor flowing upward in the hollow rod 6 can contact the water pipe 9 and flow in the opposite direction to the water flow in the inside of the water pipe 9, thereby preheating the water in the inside of the water pipe 9 to a certain temperature, and then the water can quickly vaporize when it contacts the iron core 5, thereby improving the generation efficiency of water vapor.

[0044] The water pipe 9 is provided with a gas guide piece 13 between the outside of the water pipe 9 and the inside of the hollow rod 6, and the gas guide piece 13 is located above the pressure relief port 12; the gas guide piece 13 is designed in the shape of a spiral disc. By providing the gas guide piece 13, the high-temperature water vapor in the inside of the hollow rod 6 is guided to flow in a spiral disc shape outside the water pipe 9, thereby prolonging the contact time of the high-temperature water vapor with the water pipe 9 and improving the heating uniformity of the water flow in the water pipe 9, so that the water flow can fully absorb heat from the water vapor.

[0045] As a preferred embodiment of the present application, the iron core 5 is internally provided with a cavity 14; the water pipe 9 and the cavity 14 are in communication with each other through a shunt pipe 15; and the surface of the iron core 5 is uniformly provided with a group of guide holes 16. When the water flow enters the conical cover 7 along the water pipe 9, it also synchronously enters the inside of the cavity 14 of the iron core 5 through the shunt pipe 15, and then the heat generated in the inside of the iron core 5 can heat and vaporize the water in the cavity 14, and the generated water vapor escapes outward through the guide holes 16, so that the outer surface and the inside of the iron core 5 can both generate water vapor, thereby improving the yield and generation rate of water vapor.

[0046] The cavity 14 is uniformly provided with a group of water blocking plates 17, and the water blocking plates 17 are concave downward; the water blocking plates 17 are made of a good heat-conducting material; the surface of the water blocking plates 17 is uniformly provided with a group of through holes 18, and the through holes 18 of adjacent water blocking plates 17 are staggered with each other. By providing a plurality of water blocking plates 17, when the water flow enters the inside of the cavity 14 through the shunt pipe 15, it can be sequentially blocked by the plurality of water blocking plates 17, and the water flow sequentially flows downward through the staggered through holes 18, thereby prolonging the flow path of the water flow and distributing the water on the surface of the plurality of water blocking plates 17, so that the water is more dispersed in the inside of the cavity 14, and the water is heated by the heat-conducting water blocking plates 17 respectively, thereby enhancing the heating and boiling effect of the iron core 5 on the water and improving the heating degree of the oil shale.

[0047] The water blocking plate 17 is uniformly distributed with a group of fins 19 on the upper side; the fins 19 are made of good heat-conducting material; the elastic element 20 is fixedly connected between the fins 19 and the water blocking plate 17. By arranging the heat-conducting fins 19, the heat generated in the iron core 5 can be conducted to the fins 19 along the water blocking plate 17, the contact area between the fins 19 and the water is further increased, the heating efficiency of the water is improved, and by arranging the elastic element 20, the boiling action of the water on the surface of the water blocking plate 17 can make the fins 19 vibrate, so as to further disturb and roll the water, and the heat exchange efficiency is improved.

[0048] As a preferred embodiment of the present application, the iron core 5 is uniformly distributed with a group of annular water stopping petals 21 on the surface; the water stopping petals 21 are made of good heat-conducting material; there is an included angle between the water stopping petals 21 and the iron core 5; the annular water guide piece 22 is fixedly connected to the outside of the water stopping petals 21; the water guide piece 22 covers the top of the water stopping petals 21, and there is a gap between the water guide piece 22 and the water stopping petals 21. When the water in the cavity 14 boils, it is easy to splash outward through the guide hole 16, by arranging the water stopping petals 21, the water splashing outward and the water dripping from the top outer surface of the iron core 5 can be blocked by the water stopping petals 21, so as to reduce the falling speed of the water on the surface of the iron core 5, so that the water is fully heated by the iron core 5, and the water can be stored between the inside of the water stopping petals 21 and the iron core 5 during the falling process, the water is further heated and vaporized by the iron core 5 and the heat-conducting water stopping petals 21, when the water is full between the water stopping petals 21 and the iron core 5, and then flows outward, the water flow can be guided by the water guide piece 22, so that the water can flow along the gap between the water stopping petals 21 and the water guide piece 22 to the outside of the water stopping petals 21 and the surface of the iron core 5 and continue to be heated, preventing the water flow from falling along the edge of the water stopping petals 21 and being difficult to contact with the iron core 5 and being unable to be heated.

[0049] As a preferred embodiment of the present application, the water collecting cap 23 is fixedly connected to the lower side of the iron core 5; there is a gap between the water collecting cap 23 and the bottom of the iron core 5. By arranging the water collecting cap 23, when the water flow still does not vaporize after flowing through a plurality of water stopping petals 21 on the outside of the iron core 5 in turn, the remaining water can be collected in the water collecting cap 23, and the collected water is further heated and vaporized by the bottom of the iron core 5, so as to improve the utilization degree of water resources, fully form water vapor, and increase the conversion rate of water from liquid to gas.

[0050] Working principle: the hollow rod 6 is used to lower the heater 2 to the position of oil shale inside the working well 1, and the induction coil 4 is powered to generate an induced current inside the iron core 5 and generate a large amount of heat, thereby heating the surrounding oil shale. The device uses efficient electromagnetic induction technology and optimized heating control strategy to realize the rapid in-situ conversion of oil shale underground, which can improve the thermal cracking efficiency of oil shale, greatly reduce the environmental impact and operation cost, and avoid the safety risks brought by fuel leakage. The water pipe 9 is connected with the external water source, and the water flows into the conical cover 7 inside the water pipe 9 during work, and is sprayed out from the spray hole 8 on the inner side of the conical cover 7 towards the top of the iron core 5. After the water contacts the surface of the iron core 5, it is quickly evaporated and vaporized by the heat, generating a large amount of water vapor, which is released through the release hole 10 on the surface of the heater 2 to heat the oil shale, thereby improving the uniformity of heating the oil shale, and the high-pressure water vapor is beneficial to fracturing the surrounding rock and soil, so that the oil shale produces many small cracks, and then the water vapor can enter the inside of the oil shale along these cracks to heat, further improving the cracking efficiency of the oil shale and being beneficial to the collection of oil and gas resources.

[0051] By setting the pressure relief port 12 and the pressure relief valve, when the pressure inside the working well 1 reaches a certain threshold, the pressure relief valve is automatically opened, and the gas flows into the hollow rod 6 and flows upward to the outside of the well through the pressure relief port 12, thereby relieving the pressure of the working well 1, preventing the risk of explosion due to high pressure, and the high-temperature water vapor can contact the water pipe 9 during upward flow in the hollow rod 6, and the direction of the water flow in the water pipe 9 is opposite, thereby preheating the water inside the water pipe 9 to a certain temperature, and then the water can be quickly vaporized when it contacts the iron core 5, improving the generation efficiency of water vapor. By setting the air guide piece 13, the high-temperature water vapor inside the hollow rod 6 is guided to flow upward in a spiral shape outside the water pipe 9, thereby prolonging the contact time of the high-temperature water vapor with the water pipe 9, improving the heating uniformity of the water flow in the water pipe 9, and allowing the water flow to fully absorb heat from the water vapor;

[0052] When the water flows into the conical cover 7 along the water pipe 9, it also synchronously enters the cavity 14 inside the iron core 5 through the shunt pipe 15, and the heat generated inside the iron core 5 can heat and vaporize the water in the cavity 14, and the generated water vapor escapes outward through the guide hole 16, so that the outer surface and the inside of the iron core 5 can generate water vapor to improve the yield and generation rate of water vapor; by arranging multiple water blocking plates 17, after the water flow enters the cavity 14 inside through the shunt pipe 15, it can be sequentially blocked by multiple water blocking plates 17, and the water flow sequentially flows downward through the mutually staggered through holes 18, thereby prolonging the flow path of the water flow, distributing the water on the surface of the multiple water blocking plates 17, and making the water more dispersed inside the cavity 14. The water blocking plates 17 are heat-conducting, and the water is heated respectively by the heat-conducting water blocking plates 17, thereby enhancing the heating and boiling effect of the iron core 5 on the water and improving the heating degree of the oil shale; by arranging heat-conducting fins 19, the heat generated inside the iron core 5 can be conducted to the multiple fins 19 along the water blocking plates 17, the contact area between the fins 19 and the water is further increased, the heating efficiency of the water is improved, and by arranging the elastic member 20, the boiling effect of the water on the surface of the water blocking plate 17 can cause the fins 19 to vibrate, thereby further disturbing and rolling the water, and improving the heat exchange efficiency;

[0053] When the water inside the cavity 14 boils, it is easy to splash outward through the guide hole 16, by arranging the water stop flaps 21, the water splashing outward and the water dripping from the top outer surface of the iron core 5 can be blocked by multiple water stop flaps 21, thereby reducing the falling speed of the water on the surface of the iron core 5, so that the water is fully heated by the iron core 5, and the water can be stored between the inside of the water stop flaps 21 and the iron core 5 during the falling process, and the water is further heated and vaporized by the iron core 5 and the heat-conducting water stop flaps 21, when the storage between the water stop flaps 21 and the iron core 5 is full and the water flows outward, the water flow can be guided by the water guide piece 22, so that the water can flow along the gap between the water stop flaps 21 and the water guide piece 22 to the outside of the water stop flaps 21 and the surface of the iron core 5 and continue to be heated, preventing the water flow from falling along the edge of the water stop flaps 21 and being difficult to contact the iron core 5 and being unable to be heated; by arranging the water collecting cap 23, when the water flow still does not vaporize after sequentially flowing through multiple water stop flaps 21 on the outside of the iron core 5, the remaining water can fall into the water collecting cap 23 for collection, and the collected water is further heated and vaporized by the bottom of the iron core 5, thereby improving the utilization degree of water resources, fully forming water vapor, and increasing the conversion rate of water from liquid to gas.

[0054] The above front, back, left, right, up, down are based on the drawings in the specification Figure 1 , according to the standard of human observation angle, the side of the device facing the observer is defined as front, the left side of the observer is defined as left, and so on.

[0055] In the description of the application, it is to be understood that the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings and are used only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the application.

[0056] The basic principles, main features and advantages of the application are shown and described above. Those skilled in the art should understand that the application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the application. Without departing from the spirit and scope of the application, various changes and improvements can be made to the application, and these changes and improvements all fall within the scope of the application. The scope of protection of the application is defined by the appended claims and their equivalents.

Claims

1. A positive temperature electromagnetic frequency conversion induction underground heating device for in-situ conversion of hydrocarbons from oil shale, characterized in that: This includes electromagnetic frequency converters, temperature monitoring systems, and underground heating components; The electromagnetic frequency converter can adjust the output frequency to adapt to different geological conditions. The temperature monitoring system monitors the heating temperature in real time to ensure that the heating process is carried out at the optimal temperature. The underground heating assembly includes a heater (2); a pair of mounting rings (3) are fixedly connected inside the heater (2); an induction coil (4) is fixedly connected between the mounting rings (3); the induction coil (4) is made of barium titanate composite material and tungsten alloy material; a columnar iron core (5) is provided inside the induction coil (4); a hollow rod (6) is fixedly connected to the top of the heater (2). The heater (2) has a hollow conical cover (7) located above the iron core (5) inside; a set of spray holes (8) are evenly distributed on the inner side of the conical cover (7); a water pipe (9) is installed inside the hollow rod (6), and the lower end of the water pipe (9) extends into the heater (2) and communicates with the conical cover (7); a set of release holes (10) are evenly distributed on the surface of the heater (2). The iron core (5) has a cavity (14) inside; the water pipe (9) and the cavity (14) are connected to each other through a diversion pipe (15); a set of guide holes (16) are evenly distributed on the surface of the iron core (5). The cavity (14) is filled with a set of water-blocking plates (17), and the water-blocking plates (17) are recessed downwards; the water-blocking plates (17) are made of a good thermally conductive material; the surface of the water-blocking plates (17) is filled with a set of through holes (18), and the through holes (18) of adjacent water-blocking plates (17) are staggered. A set of fins (19) are evenly distributed on the upper side of the water-blocking plate (17); the fins (19) are made of a good thermally conductive material; and an elastic element (20) is fixedly connected between the fins (19) and the water-blocking plate (17). The surface of the iron core (5) is evenly distributed with a set of annular water-stopping petals (21); the water-stopping petals (21) are made of a good thermally conductive material; there is an angle between the water-stopping petals (21) and the iron core (5); an annular water-guiding plate (22) is fixedly connected to the outside of the water-stopping petals (21); the water-guiding plate (22) covers the top of the water-stopping petals (21), and there is a gap between the water-guiding plate (22) and the water-stopping petals (21).

2. The positive temperature electromagnetic frequency conversion induction underground heating device for in-situ conversion of oil shale hydrocarbon generation according to claim 1, characterized in that: A sealing block (11) is provided on the outer side of the top of the hollow rod (6).

3. The positive temperature electromagnetic frequency conversion induction underground heating device for in-situ conversion of oil shale hydrocarbon generation according to claim 2, characterized in that: The hollow rod (6) has a pressure relief port (12) located at the top of the sealing block (11) below the sealing block (11); a pressure relief valve is installed inside the pressure relief port (12).

4. The positive temperature electromagnetic frequency conversion induction underground heating device for in-situ conversion of oil shale hydrocarbon generation according to claim 3, characterized in that: An air guide plate (13) is provided between the outer side of the water pipe (9) and the inner side of the hollow rod (6), and the air guide plate (13) is located above the pressure relief port (12); the air guide plate (13) is designed in a spiral spiral shape.

5. The positive temperature electromagnetic frequency conversion induction underground heating device for in-situ conversion of oil shale hydrocarbon generation according to claim 1, characterized in that: A water-holding cap (23) is fixedly connected to the lower side of the iron core (5); there is a gap between the water-holding cap (23) and the bottom of the iron core (5).

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