A high-frequency explosion-proof petroleum electromagnetic heater capable of waste heat recovery and reuse

Abstract

A high-frequency explosion-proof electromagnetic heater for petroleum, capable of waste heat recovery and reuse, belongs to the technical field of oil and gas extraction equipment. It aims to address the technical shortcomings of existing high-frequency electromagnetic heaters for oil and gas, such as insufficient waste heat recovery rate and low comprehensive thermal energy utilization rate, and the need for structural design improvement. The cylindrical high-frequency explosion-proof electromagnetic heater's main body contains a reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier and a ferromagnetic U-shaped waste heat recovery oil pipeline. The two straight pipe sections of the reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier are equipped with heat-insulating supports and high-temperature resistant insulated cable winding coils. One end of the ferromagnetic U-shaped waste heat recovery oil pipeline is connected in series with the reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier, and the other end is connected to the inlet pipeline connector. It is a novel and practical enclosed explosion-proof structure, suitable for heating oil and oil-gas mixtures in oilfield production and pipelines.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil and gas extraction equipment, specifically relating to a high-frequency explosion-proof electromagnetic heater for petroleum that can recover and reuse waste heat. Background Technology

[0002] With the increasing development and technological advancement of oilfield production and transportation equipment in the oil and gas industry, the requirements for the anti-sand and scale inhibition technical performance of electromagnetic heater devices for oilfield wellhead pipelines and gathering pipelines are also becoming increasingly stringent. This is because, in the later stages of production in some oilfields, the water and sand content of the oil layers relatively increases, resulting in a relative increase in the oil-coated sand content in the produced fluid. In existing technologies, high-frequency electromagnetic heaters for oil and gas mainly employ a high-frequency electromagnetic heating process device that circumferentially winds a high-frequency coil around the outer wall of the oil and gas pipeline. However, because the high-frequency electromagnetic induction coil of this type of oilfield high-frequency electromagnetic heating device is exposed to the air, after electromagnetic heating of the oil-coated sand medium, a laminar flow phenomenon of oil-sand thermal separation occurs. This leads to sand settling at the bottom of the electromagnetic heater or at the oil flow lift point. With the accumulation of sediment over time, oil-sand blockage occurs within the electromagnetic heater cavity, causing and affecting the normal heat dissipation of the heater windings, and even burning them out. Consequently, in actual operation, the frequency of dredging operations for the electromagnetic heater needs to be continuously increased. For example, Chinese patent announcement CN204266990U discloses an explosion-proof electromagnetic heater for petroleum. It consists of a ferromagnetic steel core, an inner steel sleeve, and an outer steel sleeve, arranged sequentially from the inside out. An explosion-proof junction box is connected to the ferromagnetic steel core, inner steel sleeve, and outer steel sleeve. It also includes insulated electromagnetic wires, conductive terminals, and a heat insulation layer. The outer steel sleeve is fitted with the heat insulation layer, and an electromagnetic induction winding coil layer composed of insulated electromagnetic wires is wound around the outer wall of the heat insulation layer. A protective layer is also fitted around the electromagnetic induction winding coil layer. The ends of the insulated electromagnetic wires are connected to the conductive terminals with insulating gaskets inside the explosion-proof junction box. However, due to its structural limitations, it suffers from insufficient waste heat recovery and low comprehensive thermal energy utilization, restricting its practical installation and application. Its structure still has room for development and requires further structural design improvements.

[0003] In view of this, in order to adapt to the development and progress of oilfield production and transportation equipment in the oil and gas industry, it is necessary to further improve and develop a new type of high-frequency explosion-proof petroleum electromagnetic heater that can improve the waste heat recovery and reuse rate. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies and address the technical defects of insufficient waste heat recovery and low comprehensive utilization of thermal energy in the actual operation of current high-frequency electromagnetic heaters for oil and gas, and the need for structural design improvements, this utility model aims to provide a novel and practical high-frequency explosion-proof oil electromagnetic heater with a high-frequency electromagnetic induction coil sealed within the outer sleeve cavity of the high-frequency electromagnetic heater body. In actual operation, this design prevents oil and sand blockage in the pipeline cavity, ensuring smooth oil and gas transport. Furthermore, the accumulated waste heat energy from the high-frequency electromagnetic induction coil within the outer sleeve cavity of the high-frequency electromagnetic heater body is recovered and reused, resulting in a high-efficiency, easy-to-use high-frequency electromagnetic heater.

[0005] The technical solution adopted by this utility model to solve the above problems is:

[0006] A high-frequency explosion-proof petroleum electromagnetic heater capable of waste heat recovery and reuse includes: a reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier, a high-frequency explosion-proof petroleum electromagnetic heater body, and a ferromagnetic U-shaped waste heat recovery oil pipeline. The high-frequency explosion-proof petroleum electromagnetic heater body is a horizontal closed cylindrical structure, consisting of an outer sleeve body with supports, both ends of which are welded with an outer sleeve head and an outer sleeve mounting flange. An explosion-proof junction box mounting section is welded to the outer top steel structure of the outer sleeve head, and an explosion-proof junction box is sealed to the outer end face of the explosion-proof junction box mounting section. The outer sleeve... The body mounting flange and the pipe-side connecting flange are connected and fixed by fastening screws. A pipe-side end cap is also welded to the outer end face of the pipe-side connecting flange. The cylindrical high-frequency explosion-proof petroleum electromagnetic heater body has a reciprocating U-shaped oil pipeline, a high-frequency electromagnetic induction heat carrier, and a ferromagnetic U-shaped waste heat recovery oil pipeline with heat-absorbing fins welded to its outer wall in series with it. Thermal insulation supports are installed on the outer peripheral walls of the two straight pipe sections of the reciprocating U-shaped oil pipeline, and working frequencies of 6-30 are wound around the outer periphery of the thermal insulation supports. The high-temperature resistant insulated cable winding coil has its conductor ends interconnected to form a parallel winding path, while the other ends are respectively connected to the high-frequency power supply terminals inside the explosion-proof junction box. A temperature sensor and a communication module for remote monitoring are integrated within the explosion-proof junction box via signal data lines. One end of the ferromagnetic U-shaped waste heat recovery oil pipeline is connected in series to the high-frequency electromagnetic induction heat carrier of the reciprocating U-shaped oil pipeline, while the other end passes through the pipe end cap and is sealed and welded to the pipe end cap wall plate as a single unit, and is also connected in series to the high-frequency explosion-proof type. The oil inlet pipe joint at the top of the inner cavity of the petroleum electromagnetic heater body forms a high-frequency electromagnetic induction heating oil delivery circuit. The oil inlet pipe joint of the ferromagnetic U-shaped waste heat recovery oil delivery pipeline and the oil outlet pipe joint of the reciprocating U-shaped oil delivery pipeline connected to the high-frequency electromagnetic induction heat carrier pass through the pipe-side mounting flange and the pipe-side end cap respectively and are sealed and welded to the wall plate at the top of the pipe-side end cap. At the pipe openings of the oil inlet pipe joint and the oil outlet pipe joint extending to the pipe joint outside the pipe-side end cap, the oil inlet pipe joint and the oil outlet pipe joint are respectively welded to the steel structure, and the channel is designed with a high inlet and low outlet structure.

[0007] The high-frequency explosion-proof petroleum electromagnetic heater described above, which can recover and reuse waste heat, has the following connection structure for the high-temperature resistant insulated cable winding coil:

[0008] (1) The high-temperature resistant insulated cable winding coil consists of two corresponding winding coils. The wire ends of one end of the two winding coils are connected in parallel with head to head or tail to tail. The wire ends of the other end of the winding coils are connected to the high-frequency power supply terminal block inside the explosion-proof junction box. The flange base plate of the explosion-proof junction box is equipped with signal data line terminal blocks.

[0009] (2) The high-temperature resistant insulated cable winding coil is made by winding high-temperature resistant insulated and heat-resistant cable wires on the straight sections of two oil pipelines of the reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier. The tail wires of the two winding coils wound on the corresponding straight sections of the U-shaped ferromagnetic oil pipelines are short-connected and fastened with screws. The other end wires of the two winding coils are respectively connected to the two terminals of the high-frequency power supply terminal block. The corresponding outer terminal block is ready to be connected to the high-frequency input power supply. The structure formed is a high-frequency excitation and magnetothermal energy exchange structure for the high-frequency electromagnetic induction winding coil to perform high-frequency electromagnetic induction heating on the ferromagnetic oil pipeline, forming an electrothermal closed loop for high-frequency electromagnetic induction heating of the petroleum medium flowing in the ferromagnetic oil pipeline.

[0010] (3) The high-temperature resistant insulated cable winding coil can be either a single high-frequency electromagnetic induction heating connection structure of a set of high-temperature resistant insulated cable winding coils or a multi-set high-frequency electromagnetic induction heating connection structure of multiple sets of high-temperature resistant insulated cable winding coils connected by series and parallel combinations, and the connection structure is a connection structure in which high-frequency electromagnetic induction heating is implemented by the high-temperature resistant insulated cable winding coils.

[0011] The aforementioned high-frequency explosion-proof petroleum electromagnetic heater capable of waste heat recovery and reuse comprises a set of U-shaped waste heat recovery oil pipelines, each with the same diameter as the oil pipeline of the reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier and with spiral metal heat-absorbing fins on the outer wall of the oil pipe. The ferromagnetic U-shaped waste heat recovery oil pipeline has a connecting flange at its input end connected to the cold oil supply pipeline, and its other end port is connected in series to the reciprocating U-shaped oil pipeline via a connecting elbow. The inlet of the high-frequency electromagnetic induction heat carrier's oil inlet pipeline and the outlet of the hot oil outlet pipeline at the other end of the reciprocating U-shaped oil pipeline are connected to the hot oil external transmission pipeline via an outlet flange. The ferromagnetic U-shaped waste heat recovery oil pipeline is configured to absorb copper loss heat, stray magnetic field heat, and cylinder thermal effect heat within the shell cavity. It constitutes a high-frequency electromagnetic induction winding coil heat carrier that applies high-frequency electromagnetic induction to the cold oil in the U-shaped oil pipeline. The heating process of the ferromagnetic U-shaped waste heat recovery oil pipeline releases all the remaining heat generated by the work done by the induction coil current within the shell-side cavity, including the heat loss from copper loss, the heat absorbed by the stray magnetic field generated by the high-frequency work, the heat from the annular thermal effect formed by the ionization shielding of the outer sleeve, and the heat from the backflow of the high-frequency electromagnetic induction coil heat carrier into the external environment. This heat is then concentrated in the sealed environment of the shell-side cavity of the cylindrical high-frequency explosion-proof petroleum electromagnetic heater. All the heat in this environment directly acts on the pipe wall and heat-absorbing fins of the ferromagnetic U-shaped waste heat recovery oil pipeline to directly heat the cold oil medium flowing in the pipeline. This heat interacts with the electromagnetic heating of the reciprocating U-shaped oil pipeline's high-frequency electromagnetic induction heat carrier, together forming a circulating heating path for the high-frequency electromagnetic heating of the oil medium within the pipeline. This constitutes a connection structure for an oil transport channel that integrates high-frequency electromagnetic induction heating and waste heat recovery and reuse in the ferromagnetic oil pipeline.

[0012] The aforementioned high-frequency explosion-proof petroleum electromagnetic heater capable of waste heat recovery and reuse features an explosion-proof junction box. This junction box is a multi-channel explosion-proof wiring structure where the terminals of each high-temperature insulated cable winding coil are introduced into a high-frequency terminal post, and the terminals of multiple high-frequency electromagnetic induction heating transmission circuits, formed by the combination and connection of multiple high-temperature insulated cable winding coils, are simultaneously introduced into the same explosion-proof junction box with multiple high-frequency terminal posts. Each terminal is connected to its corresponding high-frequency terminal post, achieving explosion-proof wiring. The sealing mounting flange of the high-frequency terminal post welded to the bottom of the explosion-proof junction box is made of any of the following materials: non-magnetic stainless steel, copper, aluminum, carbon steel-stainless steel composite, carbon steel-copper composite, or carbon steel-aluminum composite, ensuring explosion-proof performance and electrical insulation.

[0013] The aforementioned high-frequency explosion-proof electromagnetic heater for waste heat recovery and reuse, wherein the ferromagnetic U-shaped waste heat recovery oil pipeline is either a spiral finned heat-conducting pipe with heat-absorbing fins welded to its outer wall, or a metal nail-headed heat-conducting pipe with heat-conducting nail heads welded to its outer peripheral wall, or either a ferromagnetic U-shaped waste heat recovery oil pipeline with heat-dissipating fins. The fin height of the spiral finned heat-conducting pipe is 9-20mm, and the spacing is 13-20mm. The heat-absorbing fins of the spiral finned heat-conducting pipe are heat-absorbing and heat-conducting fins coated with a nano-coating to further improve heat transfer efficiency.

[0014] The heat source and channel design of the waste heat recovery system of the petroleum electromagnetic heater of this utility model are as follows: the inlet flange of the cold flow medium is welded to the first end of the heat absorption and recovery conductive tube, and the tail end of the tube is sealed and welded to the first end of the high-frequency electromagnetic induction heat carrier of the reciprocating U-shaped oil pipeline. The outlet flange of the fluid medium is welded to the end of the heat carrier of the oil pipeline, forming a fluid flow pipe coil channel for waste heat recovery and electromagnetic induction heating of the fluid medium in the oil pipeline. The flow direction of this channel is a high-inlet, low-outlet structure, that is, the cold fluid medium enters from the inlet pipe joint (located at the top of the inner cavity of the high-frequency explosion-proof petroleum electromagnetic heater), and the hot fluid medium flows out from the outlet pipe joint (located at the bottom), using gravity to enhance the heat exchange efficiency; it first flows through the upper ferromagnetic U-shaped waste heat recovery oil pipeline, i.e., the U-shaped heat absorption and recovery conductive tube, the tube wall of which... The heat generated by the copper resistance of the inductor coil and the redundant heat accumulated on the pipe wall during the electromagnetic induction heating of the fluid medium, or the waste heat directly reflected back to the cavity environment through radiation, are all rapidly absorbed by the heat-absorbing and recovering hollow tube within the enclosed outer shell cavity environment space. The heat from these components is superimposed and acts on the wall of the heat-absorbing and recovering hollow tube, directly heating the cold flow medium flowing inside the tube cavity. This effectively absorbs the waste heat accumulated in the outer shell cavity environment space and relatively effectively reduces the ambient temperature of the inductor coil during operation. While significantly increasing and improving the process temperature of the cold flow medium inside the heat-absorbing and recovering hollow tube cavity, it also achieves the dual expected effects of waste heat recovery and reuse and energy saving and efficiency improvement of the equipment.

[0015] The aforementioned high-frequency explosion-proof petroleum electromagnetic heater capable of waste heat recovery and reuse comprises a thermal insulation support body consisting of 5-11 strip-type non-magnetic thermal insulation pads evenly distributed and connected along the pipe axis, i.e., along the length of the oil pipeline; or a double-layer composite thermal insulation support body composed of 5-11 non-magnetic thermal insulation pads bonded to the top surface of a stainless steel flat square tube base; or any of the following thermal insulation support bodies: high-density high-temperature resistant heat-insulating felt strips and soft mica board strips wrapped around the pipe perimeter wall; the non-magnetic thermal insulation pads are any of the following: mica insulating board pads with a support height of 10-50mm; epoxy resin insulating board pads; or polyimide insulating board pads. This structure serves as a skeleton to support the high-temperature insulated cable winding coil. Its functional structure acts as a circular radial support skeleton for the electromagnetic induction winding coil, also known as the inner skeleton of the electromagnetic induction winding coil. It also makes it easier to secure the winding connection of the electromagnetic induction winding coil wires wrapped around the oil pipeline. The selected non-magnetic heat-insulating support does not damage the winding coil, does not interfere with electromagnetic induction, and ensures the stability of the coil during the high-frequency electromagnetic heating process.

[0016] The above-mentioned high-frequency explosion-proof petroleum electromagnetic heater capable of waste heat recovery and reuse includes any of the following sealing connection structures: a high-temperature resistant O-ring rubber seal is sandwiched between the outer sleeve mounting flange and the pipe-side mounting flange of the main body welded structure, and an explosion-proof sealing bolt is used to fasten the connection structure with the O-ring groove milled on the mounting flange end face; a steel flange plane sealing explosion-proof fastening connection; and a flange gasket sealing filler end face explosion-proof sealing bolt fastening connection.

[0017] In use, according to design requirements and actual needs, the oil inlet flange and oil outlet flange of the external extension pipe are connected to the external oil pipeline. These, along with the ferromagnetic U-shaped waste heat recovery oil pipeline installed in the inner cavity of the high-frequency explosion-proof petroleum electromagnetic heater body and the high-frequency electromagnetic induction heat carrier welded to the reciprocating U-shaped oil pipeline, form a high-frequency explosion-proof electromagnetic induction heating oil flow path. The high-frequency power supply terminal in the explosion-proof junction box is then connected to an external high-frequency input power supply, forming an electromagnetic induction power transmission circuit for heating the reciprocating U-shaped high-frequency electromagnetic induction winding coil. This enables high-frequency electromagnetic induction heating of the petroleum medium flowing through the ferromagnetic U-shaped waste heat recovery oil pipeline and the electromagnetic induction heat carrier oil pipeline within the outer sleeve of the high-frequency explosion-proof petroleum electromagnetic heater.

[0018] This invention relates to a high-frequency explosion-proof petroleum electromagnetic heater composed of a reciprocating U-shaped oil pipeline with a high-frequency electromagnetic induction heat carrier and a ferromagnetic U-shaped waste heat recovery oil pipeline. A closed annular thermal insulation layer is installed between the oil pipeline bundle and the adjacent gap of the inner pipe wall of the outer sleeve. During the high-frequency electromagnetic heating process, the high-frequency conductor coil, through which the high-frequency current passes, excites the ferromagnetic steel pipe, generating strong hysteresis eddy current heat, resistance heat, and the inner skin ring effect heat of the steel pipe. These multiple heats are superimposed and directly act on the oil medium flowing inside the reciprocating U-shaped oil pipeline with the high-frequency electromagnetic induction heat carrier. Furthermore, when the current passes through, its winding coil… The coil itself generates corresponding resistance and inductive reactance. Therefore, when current flows through the coil, the copper loss resistance heat loss of the inductor and the reactive power exchange heat generated by the inductor's reactive excitation are presented. At the same time, the conductor of the inductor will generate a linear heat accumulation effect. The accumulated heat will continue to increase with the operation time and be slowly released into the environmental space inside the main cavity of the high-frequency explosion-proof petroleum electromagnetic heater. The temperature inside the sealed main cavity of the high-frequency explosion-proof petroleum electromagnetic heater will continue to increase further. In order to minimize the heat transfer from the outer surface of the electromagnetic heater shell to the surrounding environment, the coil's internal temperature will be further increased. To mitigate heat loss caused by radiation from the surrounding air environment, annular heat-insulating protective sleeves are wrapped around the inner wall of the main body of the electromagnetic heater and the outer circumference of the high-frequency electromagnetic induction heat carrier tube bundle connected to the ferromagnetic U-shaped waste heat recovery oil pipeline. This ensures minimal heat loss from the surface of the outer shell, maintaining a saturation temperature rise of no more than ±6°C from the ambient temperature during long-term heating operation. This application utilizes a high-frequency explosion-proof petroleum electromagnetic heater... The upper part of the body cavity is connected in series with the U-shaped electromagnetic induction heating heat carrier pipeline. The ferromagnetic U-shaped waste heat recovery oil pipeline with steel fins on its pipe wall absorbs the ambient heat. The recovered ambient heat is directly conducted by the heated pipe body and acts on the cold oil medium flowing in the oil pipeline. The flowing cold oil quickly carries away the circulating heat absorbed by the pipe wall of the ferromagnetic U-shaped waste heat recovery oil pipeline, while maintaining the dynamic balance of the air ambient temperature in the main cavity of the high-frequency explosion-proof petroleum electromagnetic heater. This reduces the ambient temperature in the main cavity of the high-frequency explosion-proof petroleum electromagnetic heater and achieves the technical effect of waste heat recovery and reuse.A key technology involves winding two parallel coils onto a straight section of a U-shaped steel pipe to form a reciprocating closed-loop high-frequency coil power transmission path. This cancels out the leakage magnetic field caused by stray magnetic field radiation on the outer casing of the high-frequency electromagnetic induction heater, resulting in a closed-loop shielding electrostatic voltage. This counteracts the electrostatic voltage generated on the surface of the outer casing, leading to short-circuit heating and arcing, and the high-frequency harmonic pollution to the power grid and other electrical equipment, causing resonant heating and electronic interference. This design fundamentally solves the technical challenge of not being able to install a metal outer protective sleeve around the winding coil of a high-frequency electromagnetic heater, achieving explosion-proof safety for the sealed cylinder and the entire equipment. Therefore, it can be widely used in oilfield oil extraction and transportation, petrochemical heating, and other oil and gas explosion-proof environments. Furthermore, to improve heat absorption and exchange efficiency, the connected ferromagnetic U-shaped waste heat recovery pipeline is designed with finned steel pipes, which can increase the waste heat recovery and reuse heat exchange capacity of the pipeline by several times, resulting in a more significant application effect of waste heat recovery and reuse.

[0019] Because this utility model adopts the above-mentioned technical solution, it effectively solves the technical defects of existing high-frequency electromagnetic heaters for oil and gas, such as insufficient waste heat recovery rate and low comprehensive utilization rate of thermal energy, and the need for improvement in their structural design. Actual operation tests have also shown that it has a novel and practical structure. The high-frequency electromagnetic induction coil is sealed inside the main cavity of the high-frequency electromagnetic heater, preventing oil and sand blockage in the oil pipeline cavity during actual operation, ensuring smooth oil and gas transport, significant waste heat recovery and reuse, high thermal efficiency, and resolves the technical contradiction between high-frequency electromagnetic heating and explosion-proof requirements. It also boasts good safety and explosion-proof performance, and the high-frequency electromagnetic induction coil winding connection method eliminates stray magnetic field interference, making it safe and convenient to use. It is suitable for heating oil and oil-gas mixtures in oilfield production and pipelines in the oil and gas industry.

[0020] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the specific structure of the high-temperature resistant insulated cable winding coil of the high-frequency electromagnetic induction heating embodiment of this utility model, which is a single high-frequency induction heating unit.

[0023] Figure 2 yes Figure 1 A schematic diagram of the left-side structure of the embodiment.

[0024] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure along direction AA of the embodiment.

[0025] Figure 4 yes Figure 1 The embodiment shows a schematic diagram of the connection structure of a single U-shaped high-temperature resistant insulated cable winding coil wound with a reciprocating U-shaped ferromagnetic oil pipeline, forming a high-frequency electromagnetic induction heat carrier for the reciprocating U-shaped oil pipeline.

[0026] Figure 5 yes Figure 1 The embodiment shows a schematic diagram of the specific structure of the high-temperature resistant insulated cable winding coil for high-frequency electromagnetic induction heating, which consists of two sets of high-frequency induction heating units.

[0027] Figure 6 yes Figure 5 A schematic diagram of the left-side structure of the embodiment.

[0028] Figure 7 yes Figure 5 Schematic diagram of the cross-sectional structure along the BB direction of the embodiment.

[0029] Figure 8 yes Figure 5 The embodiment shows a schematic diagram of the connection structure of two sets of U-shaped high-temperature resistant insulated cable winding coils connected to a reciprocating U-shaped ferromagnetic oil pipeline, forming a high-frequency electromagnetic induction heat carrier for the reciprocating U-shaped oil pipeline.

[0030] Figure 9 It shows Figure 3 An alternative embodiment of the thermal insulation support structure is shown in the schematic diagram of a double-layer thermal insulation support structure composed of a stainless steel base and a strip-type non-magnetic thermal insulation pad.

[0031] The labels in the attached diagram are as follows: 1-Reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier; 2-Ferromagnetic U-shaped waste heat recovery oil pipeline; 201-Helical finned heat pipe; 3-Cylindrical high-frequency explosion-proof petroleum electromagnetic heater body; 4-High-temperature resistant insulated cable winding coil; 5-Insulated support body; 501-Strip non-magnetic heat insulation pad; 502-Stainless steel base; 6-Explosion-proof junction box mounting section; 7-Outer sleeve end cap; 8-Outer sleeve mounting flange; 9-Pipe-side connection flange; 10-Pipe-side end cap; 11-Outlet pipeline connector; 111-Outlet pipeline mounting flange; 12-Explosion-proof junction box; 13-Inlet pipeline connector; 131-Inlet pipeline mounting flange; 14-High-frequency power supply terminal; 15-Explosion-proof junction box base plate mounting flange; 16-Signal data line terminal. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "front end", "rear end", "head", "tail", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] As attached Figures 1-4As shown, this embodiment includes: a reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier 1, a high-frequency explosion-proof petroleum electromagnetic heater body, and a ferromagnetic U-shaped waste heat recovery oil pipeline 2. The high-frequency explosion-proof petroleum electromagnetic heater body is a horizontal closed cylindrical structure, consisting of a main shell with supports, an outer shell end cap 7, and an outer shell mounting flange 8 welded to both ends, forming a cylindrical high-frequency explosion-proof petroleum electromagnetic heater body 3. An explosion-proof junction box mounting section 6 is welded to the outer top steel structure of the outer shell end cap 7, and an explosion-proof junction box 12 is sealed and connected to the outer end face of the explosion-proof junction box mounting section 6. The outer shell mounting flange 8 and the pipe-side connecting flange 9 are connected and fixed by fastening screws. A pipe end cap 10 is also welded to the outer end face of the pipe-side connecting flange 9; the cylindrical high-frequency explosion-proof petroleum electromagnetic heater body 3 is equipped with a reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier 1 and a ferromagnetic U-shaped waste heat recovery oil pipeline 2 with heat-absorbing fins welded to its outer wall. Thermal insulation supports 5 are installed on the outer peripheral walls of the two straight pipe sections of the reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier 1, and high-temperature resistant insulated cable winding coils 4 with a working frequency of 6-30kHz are wound around the outer periphery of the thermal insulation supports 5. One end of the conductor of the high-temperature resistant insulated cable winding coil 4 is connected to each other to form a parallel winding path, and the other end is connected to... The high-frequency power supply terminal 14 is connected to the explosion-proof junction box 12. The outer end of the high-frequency power supply terminal 14 is connected to a high-frequency heating power supply to form a high-frequency heating power transmission circuit for the reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier 1. A temperature sensor and a communication module for remote monitoring are integrated in the explosion-proof junction box 12 via signal data line terminal 16. One end of the ferromagnetic U-shaped waste heat recovery oil pipeline 2 is connected in series to the U-shaped high-frequency electromagnetic induction winding coil ferromagnetic oil pipeline heat carrier 1, and the other end passes through the pipe end cap 10 and is sealed and welded to the pipe end cap as a whole. It is also connected in series to the oil inlet pipe located at the top of the inner cavity of the high-frequency explosion-proof petroleum electromagnetic heater body 3. The joint 13 forms a high-frequency electromagnetic induction heating oil transmission circuit for a high-frequency explosion-proof petroleum electromagnetic heater for waste heat recovery and reuse. The inlet pipe joint 13 of the ferromagnetic U-shaped waste heat recovery oil transmission pipeline 2 and the outlet pipe joint 11 of the reciprocating U-shaped oil transmission pipeline high-frequency electromagnetic induction heat carrier 1 pass through the pipe-side mounting flange 9 and the pipe-side end cap 10 in sequence and are then sealed and welded to the top wall plate of the pipe-side end cap. At the pipe openings of the inlet pipe joint 13 and the outlet pipe joint 11 extending to the outer pipe joint of the pipe-side end cap 10, the inlet pipe mounting flange 131 and the outlet pipe mounting flange 111 are respectively welded to the steel structure, forming a closed-loop pipeline for high-frequency electromagnetic induction heating oil transmission.The explosion-proof junction box 12 in this embodiment has an IP65 sealing rating. It adopts a non-magnetic stainless steel base plate flange and combines an O-ring seal with a grooved explosion-proof junction box with an IP65 sealing rating.

[0035] For example, see Appendix Figure 1 , Figure 4 In this embodiment, the high-temperature resistant insulated cable winding coil 4 consists of two corresponding winding coils. The wire ends of one end of each winding coil adopt a wiring structure in which the tails are connected in parallel. The wire ends of the other end of the winding coil are connected to the high-frequency power supply terminal 14 inside the explosion-proof junction box 12. The base plate of the explosion-proof junction box base plate mounting flange 15 is equipped with signal data line terminal 16.

[0036] Preferred options are listed in the appendix. Figures 1-4 In this embodiment, the high-temperature insulated cable winding coil 4 is formed by winding high-temperature insulated and heat-resistant cable wires onto the straight sections of the two oil pipelines of the reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier 1. The tail wires of the two winding coils of the high-temperature insulated cable winding coil 4 wound on the corresponding straight sections of the two U-shaped ferromagnetic oil pipelines are short-connected and fastened to each other with screws. The other end wires of the two winding coils are respectively connected to the two terminals of the high-frequency power supply terminal 14. The corresponding outer terminals are ready to be connected to the high-frequency input power supply. The structure formed is a high-frequency inductive heating structure that implements high-frequency excitation and magnetothermal exchange of the high-frequency electromagnetic induction winding coil on the ferromagnetic oil pipeline, and forms an electrothermal closed loop to realize high-frequency electromagnetic induction heating of the oil medium flowing in the ferromagnetic oil pipeline.

[0037] For details, please see the appendix. Figure 1 , Figure 4 In this embodiment, the high-temperature insulated cable winding coil 4 is a connection structure for implementing high-frequency electromagnetic induction heating of a group of high-temperature insulated cable winding coils. The high-temperature insulated cable winding coil 4 in this embodiment uses silicone rubber insulated copper wire, with a long-term temperature resistance ≥200℃.

[0038] For example, see Appendix Figures 5-8 In this embodiment, the high-temperature resistant insulated cable winding coil is a connection structure in which two sets of high-temperature resistant insulated cable winding coils are connected in parallel to implement high-frequency electromagnetic induction heating.

[0039] Preferred options are listed in the appendix. Figure 1 , Figures 4-5In this embodiment, the ferromagnetic U-shaped waste heat recovery oil pipeline 2 consists of a set of U-shaped waste heat recovery oil pipelines with the same diameter as the oil pipeline of the reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier 1 and spiral metal heat-absorbing fins on the outer wall of the oil pipeline. The connecting flange on the input end of the ferromagnetic U-shaped waste heat recovery oil pipeline 2 is connected to the cold oil supply pipeline, and the oil outlet on the other end is connected in series to the input end of the oil inlet pipeline of the reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier 1 via a connecting elbow. The output end of the hot oil outlet pipeline of the reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier 1 is connected to the hot oil external transmission pipeline via an oil outlet connecting flange. The ferromagnetic U-shaped waste heat recovery oil pipeline 2 is configured to absorb the copper loss heat, stray magnetic field heat, and cylinder thermal effect heat in the shell cavity.

[0040] Preferred, see Figures 1-4 The ferromagnetic U-shaped waste heat recovery oil pipeline 2 described in this embodiment is a single-set ferromagnetic U-shaped waste heat recovery oil pipeline connection structure consisting of a set of connecting elbows of the same specification and diameter connected in series to the oil inlet pipe joint 13 of the reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier 1.

[0041] For further details, please see the appendix. Figures 5-8 The ferromagnetic U-shaped waste heat recovery oil pipeline 2 described in this embodiment is a connection structure of two sets of ferromagnetic U-shaped waste heat recovery oil pipelines connected in series at the inlet pipe joint 13 of the reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier 1, consisting of two sets of connecting elbows of the same specification and diameter.

[0042] Preferred options are listed in the appendix. Figure 1 In this embodiment, the explosion-proof junction box 12 is a single-channel high-frequency electromagnetic induction heating power transmission circuit whose terminal is formed by introducing the terminal of each high-temperature resistant insulated cable winding coil 4 into a high-frequency terminal post within the explosion-proof junction box 12. It is an explosion-proof wiring structure that introduces the high-frequency terminal post into the same explosion-proof junction box. The sealing mounting base flange of the high-frequency terminal post welded to the explosion-proof junction box 12 is made of non-magnetic stainless steel.

[0043] Preferred options are listed in the appendix. Figure 4 In this embodiment, the explosion-proof junction box 12 is a junction box 12 connected to the terminal of the high-frequency electromagnetic induction heating power transmission circuit of each high-temperature resistant insulated cable winding coil 4. The junction box 12 contains a terminal structure of two high-frequency electromagnetic induction heating power transmission circuits connected by two high-temperature resistant insulated cable winding coils. The sealing mounting base plate flange of the high-frequency terminal column welded to the explosion-proof junction box 12 is made of non-magnetic stainless steel. The explosion-proof junction box meets the general requirements for equipment for explosive atmospheres in GB3836.1-2010.

[0044] Preferred options are listed in the appendix. Figure 1 The ferromagnetic U-shaped waste heat recovery oil pipeline 2 described in this embodiment is a ferromagnetic U-shaped waste heat recovery oil pipeline of steel spiral finned heat pipe 201. The spiral fins welded on the pipe body have a height of 15mm and a spacing of 16mm.

[0045] For example, participate in the attached Figure 1 , Figures 3-4 The thermal insulation support 5 described in this embodiment is composed of eight strip-type non-magnetic thermal insulation pads 501 with a support height of 30mm, which are evenly distributed and connected along the pipe axis, i.e., along the length of the oil pipeline.

[0046] For further details, please see the appendix. Figure 9 In this embodiment, the thermal insulation support 5 is a double-layer composite thermal insulation support composed of a stainless steel flat square tube base 502 with a strip of mica insulation board bonded to the top surface. It employs a double-layer composite structure, with the inner stainless steel base providing mechanical strength and the outer mica insulation board strip conforming to JB / T8149.3-2013 standard and having a temperature resistance ≥300℃.

[0047] For example, see Appendix Figure 1 , Figure 5 In this embodiment, the connection between the outer sleeve mounting flange 8 and the tube mounting flange 9 of the main body 3 of the high-frequency explosion-proof petroleum electromagnetic heater is a sealing connection structure with a high-temperature resistant O-ring rubber seal sandwiched between them.

[0048] The above is merely one embodiment. Any other technical features and solutions derived by adding components, making equivalent substitutions, and making partial improvements without creative effort by those skilled in the art are all within the scope of protection of this utility model patent.

Claims

1. A high-frequency explosion-proof petroleum electromagnetic heater capable of waste heat recovery and reuse, comprising a reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier (1) and a high-frequency explosion-proof petroleum electromagnetic heater main body, characterized in that, It also includes a ferromagnetic U-shaped waste heat recovery oil pipeline (2). The main body of the high-frequency explosion-proof petroleum electromagnetic heater is a horizontal closed cylindrical structure. It is a cylindrical high-frequency explosion-proof petroleum electromagnetic heater body (3) composed of an outer sleeve body with a support, with an outer sleeve body end cap (7) and an outer sleeve body mounting flange (8) welded to both ends respectively. The outer top steel structure of the outer sleeve body end cap (7) is welded with an explosion-proof junction box mounting section (6), and an explosion-proof junction box (12) is sealed and connected to the outer end face of the explosion-proof junction box mounting section (6). The outer sleeve body mounting flange (8) and the pipe-side connection flange (9) are connected and fixed by fastening screws. The pipe-side connection flange (9) is also fixed. The outer end face is sealed with a pipe end cap (10); the high-frequency explosion-proof petroleum electromagnetic heater body (3) is equipped with a reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier (1) and a ferromagnetic U-shaped waste heat recovery oil pipeline (2) with heat-absorbing fins welded to the outer wall of the pipe connected in series with it. The reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier (1) is equipped with heat-insulating support bodies (5) on the outer peripheral walls of the two straight pipe sections, and high-temperature resistant insulated cable winding coils (4) with a working frequency of 6-30kHz are wound on the outer periphery of the heat-insulating support bodies (5). The conductor ends of the high-temperature resistant insulated cable winding coils (4) are... One end is connected to the other end to form a parallel winding path, and the other end is connected to the high-frequency power supply terminal (14) inside the explosion-proof junction box (12). The explosion-proof junction box (12) integrates a temperature sensor and a communication module for remote monitoring via the signal data line terminal (16). One end of the ferromagnetic U-shaped waste heat recovery oil pipeline (2) is connected in series to the heat carrier (1) of the ferromagnetic oil pipeline of the U-shaped high-frequency electromagnetic induction winding coil. The other end passes through the pipe end cap (10) and is sealed and welded to the pipe end cap as a whole. It is also connected in series to the oil inlet pipe joint (13) located on the top of the inner cavity of the high-frequency explosion-proof petroleum electromagnetic heater body (3). The components are connected to form a high-frequency electromagnetic induction heating oil transmission circuit; the oil inlet pipe joint (13) of the ferromagnetic U-shaped waste heat recovery oil transmission pipeline (2) and the oil outlet pipe joint (11) connected to the high-frequency electromagnetic induction heat carrier (1) of the reciprocating U-shaped oil transmission pipeline pass through the pipe-side mounting flange (9) and the pipe-side end cap (10) respectively and are then sealed and welded to the top wall plate of the pipe-side end cap. At the pipe openings of the oil inlet pipe joint (13) and the oil outlet pipe joint (11) extending to the outside of the pipe joint of the pipe-side end cap (10), the oil inlet pipe mounting flange (131) and the oil outlet pipe mounting flange (111) are respectively welded to the steel structure, and the channel is designed as a high-inlet and low-outlet structure.

2. The high-frequency explosion-proof petroleum electromagnetic heater capable of waste heat recovery and reuse according to claim 1, characterized in that, (1) The high-temperature resistant insulated cable winding coil (4) consists of two corresponding winding coils. The wire ends of one end of the two winding coils are connected in parallel with the head or tail. The wire ends of the other end of the winding coils are connected to the high-frequency power supply terminal (14) inside the explosion-proof junction box (12). The base plate of the explosion-proof junction box mounting flange (15) is equipped with signal data line terminal (16). (2) The high-temperature resistant insulated cable winding coil (4) is made by winding high-temperature resistant insulated heat-resistant cable wires on the straight sections of the two oil pipelines of the reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier (1), and short-connecting and fastening the tail wires of the two winding coils of the high-temperature resistant insulated cable winding coil (4) wound on the straight sections of the corresponding two U-shaped ferromagnetic oil pipelines with screws. The other end of the two winding coils is connected to the two terminals of the high-frequency power supply terminal (14) respectively, and the corresponding outer terminal is ready to be connected to the high-frequency input power supply. The structure formed is a high-frequency electromagnetic induction winding coil that performs high-frequency electromagnetic induction heating on the ferromagnetic oil pipeline and a high-frequency excitation and magnetothermal energy exchange, forming an electrothermal closed loop that performs high-frequency electromagnetic induction heating on the petroleum medium flowing in the ferromagnetic oil pipeline. (3) The high-temperature resistant insulated cable winding coil (4) is either a single high-frequency electromagnetic induction heating connection structure of a set of high-temperature resistant insulated cable winding coils or a multi-set high-frequency electromagnetic induction heating connection structure of multiple sets of high-temperature resistant insulated cable winding coils (4) connected by series and parallel combination, and is a connection structure in which high-frequency electromagnetic induction heating is implemented by the high-temperature resistant insulated cable winding coil.

3. The high-frequency explosion-proof petroleum electromagnetic heater capable of waste heat recovery and reuse according to claim 1, characterized in that, The ferromagnetic U-shaped waste heat recovery oil pipeline (2) is a set of U-shaped waste heat recovery oil pipelines with the same diameter as the oil pipeline of the reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier (1) and spiral metal heat-absorbing fins on the outer wall of the oil pipe. The connecting flange on the input end of the ferromagnetic U-shaped waste heat recovery oil pipeline (2) is connected to the cold oil supply pipeline, and the oil pipe port on the other end is connected to the input port end of the oil supply pipeline of the reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier (1) via a connecting elbow. The output port of the hot oil outlet pipeline at the other end of the reciprocating U-shaped oil pipeline high-frequency electromagnetic induction heat carrier (1) is connected to the hot oil external supply pipeline via an oil outlet connecting flange. The ferromagnetic U-shaped waste heat recovery oil pipeline (2) is configured to absorb the copper loss heat, stray magnetic field heat and cylinder thermal effect heat in the shell cavity.

4. The high-frequency explosion-proof petroleum electromagnetic heater capable of waste heat recovery and reuse according to claim 1, characterized in that, The explosion-proof junction box (12) is the terminal of each high-temperature insulated cable winding coil (4) that leads to a high-frequency terminal post and the terminal of a multi-channel high-frequency electromagnetic induction heating power transmission circuit composed of multiple high-temperature insulated cable winding coils. It can also be any wiring structure that leads to the high-frequency terminal post in the same or multiple explosion-proof junction boxes to implement explosion-proof wiring. The material of the sealing mounting base flange of the high-frequency terminal post welded to the explosion-proof junction box (12) is any of the following base flange materials: non-magnetic stainless steel, copper, aluminum, carbon steel-stainless steel composite, carbon steel-copper composite, or carbon steel-aluminum composite.

5. The high-frequency explosion-proof petroleum electromagnetic heater capable of waste heat recovery and reuse according to claim 1, characterized in that, The ferromagnetic U-shaped waste heat recovery oil pipeline (2) is either a spiral finned heat pipe (201) with steel heat-absorbing fins on the pipe body, or a metal nail-headed heat pipe with heat-conducting nails welded to the outer peripheral wall of the pipe body. The heat-absorbing fins of the spiral finned heat pipe are heat-absorbing and heat-conducting fins coated with a nano-coating, with a fin height of 9-20 mm and a spacing of 13-20 mm.

6. The high-frequency explosion-proof petroleum electromagnetic heater capable of waste heat recovery and reuse according to claim 1, characterized in that, The thermal insulation support (5) is a double-layer composite thermal insulation support consisting of 5-11 strip-type non-magnetic thermal insulation pads evenly distributed and connected along the pipe axis, i.e., along the length of the oil pipeline, or 5-11 non-magnetic thermal insulation pads bonded to the top surface of a stainless steel flat square tube base, or any one of the following thermal insulation support: high-density high-temperature resistant heat insulation felt strips and soft mica board strips wrapped around the pipe perimeter wall; the non-magnetic thermal insulation pads are any one of the following: mica insulation board pads with a support height of 10-50mm, epoxy resin insulation board pads, or polyimide insulation board pads.

7. The high-frequency explosion-proof petroleum electromagnetic heater capable of waste heat recovery and reuse according to claim 1, characterized in that, The high-frequency explosion-proof petroleum electromagnetic heater body (3) has a welding structure in which a high-temperature resistant O-ring rubber seal and an O-groove end face of the mounting flange are sandwiched between the outer cylinder mounting flange (8) and the pipe mounting flange (9) for explosion-proof fastening, explosion-proof fastening of steel flange plane sealing, and explosion-proof fastening of flange gasket sealing.

Images