A high-pressure carbon dioxide resistant fracturing device electric heating device and a method of using the same

Abstract

The application discloses a high-pressure-resistant carbon dioxide fracturing device electric heating device and a use method thereof, and relates to the technical field of phase change application, and aims to solve the technical problem that the use of medicine heating of the carbon dioxide fracturing device in the prior art leads to high safety risks and hidden dangers. The application provides a high-pressure-resistant carbon dioxide fracturing device electric heating device, which comprises an electrode, a connecting flange, a heating assembly and a shell, the connecting flange is connected with the shell, the heating assembly is connected with the connecting flange and is placed in the shell, and the electrode is connected with the heating assembly. The application also provides a heating method of carbon dioxide liquid, which uses the high-pressure-resistant carbon dioxide fracturing device electric heating device. The application is heated by the chemical reaction of medicine and is changed into electric heating by the heating assembly, so that chemical medicine is not needed, and the safety of the carbon dioxide liquid heating process is improved.

Description

Technical Field

[0001] This invention relates to the field of phase change application technology, and in particular to an electric heating device for a high-pressure carbon dioxide fracturing machine and its usage method. Background Technology

[0002] Carbon dioxide fracturing devices are used in a physical blasting technique and are widely applied in fields such as coal mines, tunnels and construction, urban development and controlled blasting.

[0003] In recent years, several carbon dioxide explosion accidents have occurred in China, some of which are directly related to the ignition agent. The formulation, research and development, production, use, and storage of carbon dioxide phase change explosion ignition agents are subject to strict requirements, thus placing even more stringent demands on the thermochemical stability of carbon dioxide fracturing devices.

[0004] In the existing technology, some of the powders in the activating chemical agents inside the fracturing device have explosive properties and are explosive materials, which are mixed explosives. This poses a high safety risk and hidden danger during the use of carbon dioxide fracturing devices. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide an electric heating device for a high-pressure carbon dioxide fracturing machine and its usage method, in order to solve the technical problem that the use of drugs for heating in the prior art of carbon dioxide fracturing machines leads to high safety risks and hidden dangers.

[0006] The objective of this invention is mainly achieved through the following technical solutions:

[0007] On one hand, the present invention provides an electric heating device for a high-pressure carbon dioxide fracturing machine, comprising an electrode, a connecting flange, a heating assembly, and a housing, wherein the connecting flange is connected to the housing, the heating assembly is connected to the connecting flange and placed inside the housing, and the electrode is connected to the heating assembly.

[0008] Furthermore, the outer casing includes a housing and a fragment valve, the housing being connected to the fragment valve, the fragment valve being used to close the housing.

[0009] Furthermore, the heating assembly is arranged along the axial direction of the housing.

[0010] Furthermore, it also includes a fixing component disposed within the housing for fixing the heating component.

[0011] Furthermore, a through hole is provided on the connecting flange, the electrode passes through the through hole and is connected to the heating assembly, and an insulating layer is provided inside the through hole to insulate the electrode.

[0012] Furthermore, the heating assembly includes an inner heating tube and an outer heating tube. The inner heating tube is disposed inside the outer heating tube. One end of the inner heating tube extends out of the outer heating tube, and the other end is disposed inside the outer heating tube and electrically connected to the outer heating tube.

[0013] Furthermore, the inner heating tube and the outer heating tube are made of an iron-cobalt-aluminum-molybdenum alloy.

[0014] Furthermore, the inner heating tube and the outer heating tube are provided with multiple fine holes.

[0015] Furthermore, two heating components form a heat release unit, and multiple heat release units are configured. Each heat release unit is equipped with an external connector and an internal connector. Within the same heat release unit, the external heating tubes are electrically connected to each other through the external connector. In different heat release units, the internal heating tubes are electrically connected through the internal connector. The internal heating tube of the first group of heat release units is connected to the positive electrode of the electrode, and the internal heating tube of the last group of heat release units is connected to the negative electrode of the electrode. The support rod is arranged around the heating components.

[0016] Furthermore, the fixing assembly includes a support rod, an upper fixing flange, and a lower fixing flange. The support rod is connected to the upper fixing flange and the lower fixing flange. The upper fixing flange and the lower fixing flange are used to fix the position of the support rod. The upper fixing flange is connected to the connecting flange.

[0017] Furthermore, the support rod includes an upper connecting section, a middle section, a ladder section, and a lower connecting section. One end of the upper connecting section is connected to the upper fixed flange via a fastening nut, and the other end is connected to the middle section. The middle section is connected to the ladder section, the ladder section is connected to the lower connecting section, and the lower connecting section is connected to the lower fixed flange via a fastening nut.

[0018] Furthermore, the upper fixed flange includes an upper flange and a first threaded post, the upper flange is connected to the first threaded post, a second threaded post is provided on the connecting flange, and a threaded sleeve is provided on the first thread, the threaded sleeve being used to connect the first threaded post and the second threaded post.

[0019] Furthermore, the upper fixed flange also includes a fastening threaded ring, which is connected to the second threaded post for fixing the threaded sleeve.

[0020] Furthermore, the upper fixed flange also includes an upper insulating hole, an electrode hole, and an upper support hole provided on the upper flange. The upper insulating hole cooperates with the inner heating tube that is not connected to the electrode. The inner heating tube that is not connected to the electrode enters the upper insulating hole and connects to the upper flange. The electrode passes through the electrode hole and connects to the inner heating tube. The upper connecting section passes through the upper support hole and is fixed to the upper flange.

[0021] Furthermore, insulating rings are provided inside the upper insulating hole and the electrode hole.

[0022] Furthermore, the lower fixed flange includes a lower flange plate, a lower insulating hole, and a lower support hole. The lower insulating hole and the lower support hole are disposed on the lower flange plate. The lower insulating hole mates with the lower connecting section. The lower connecting section passes through the lower support hole. The ladder section engages with the lower flange plate. The lower connecting section is fixed on the lower flange plate. The lower insulating hole mates with the external heating pipe, so that the external heating pipe is fixed in the lower insulating hole.

[0023] On the other hand, the present invention provides a method for heating liquid carbon dioxide using the above-mentioned high-pressure carbon dioxide cracker electric heating device.

[0024] Furthermore, it includes the following steps:

[0025] S1: Connecting electrode;

[0026] S2: Connect the heating component;

[0027] S3: Connect the electrode to the heating element;

[0028] S4: Connect the connecting flange to the housing;

[0029] S5: Place the device into the pre-drilled hole;

[0030] S6: Electricity is used to heat carbon dioxide to do work.

[0031] Furthermore, in step S1, a through hole is provided on the connecting flange, and an insulating layer is provided inside the through hole. The electrode is inserted into the through hole, and sealant is injected into the through hole to seal it.

[0032] Furthermore, step S2 specifically includes:

[0033] S21: Connect the internal heating pipe and the upper connecting section to the upper fixed flange;

[0034] S22: Connect the external heating pipe and the lower connecting section to the lower fixed flange.

[0035] Furthermore, step S3 specifically includes:

[0036] S31: Connect the electrode to the internal heating tube;

[0037] S32: Connect the upper fixed flange to the connecting flange.

[0038] Furthermore, in step S4, after injecting liquid carbon dioxide into the housing, the connecting flange is connected to the housing to seal the liquid carbon dioxide inside the housing, so that the heating component comes into contact with the liquid carbon dioxide.

[0039] Furthermore, in step S5, the high-pressure carbon dioxide fracturing electric heating device is placed into the reserved hole, and after the electrode is connected to the power supply through the wire, the staff are organized to evacuate in an orderly manner.

[0040] Furthermore, in step S6, the control power supply supplies power to the electrode, and the electrode and the heating component form a closed loop in series, so that the heating component heats up to heat the liquid carbon dioxide. The pressure inside the shell gradually increases until it breaks through the rupture valve, releasing the carbon dioxide and using the impact force of the carbon dioxide to do work.

[0041] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0042] (1) The high-pressure carbon dioxide fracturing device provided by this invention changes the heating method of liquid carbon dioxide by setting electrodes and heating components. It changes the heating method from chemical reaction of the drug to electric heating by the heating components, thus eliminating the need for chemical drugs and increasing the safety of the liquid carbon dioxide heating process. The heating components can be reused, saving economic costs. At the same time, by setting multiple sets of heat release units, the current of the electrode is transferred from the inner heating tube of the first heat release unit to the outer heating tube, and then to another outer heating tube through the external connector. It is then transferred to the inner heating tube inside the other outer heating tube, and then to the inner heating tube of the next heat release unit through the internal connector, and finally to the negative electrode of the electrode. This connects multiple heat release units in series to form a closed loop, improving the power and heat release effect of the heating components and enabling the liquid carbon dioxide to be heated quickly. Multiple fine holes are set on the inner and outer heating tubes, allowing the liquid carbon dioxide to flow between the inner and outer heating tubes through the fine holes, thereby increasing the contact area between the liquid carbon dioxide and the heating components, avoiding uneven heating of the liquid carbon dioxide, and increasing the heat transfer efficiency of the liquid carbon dioxide.

[0043] (2) The high-pressure carbon dioxide fracturing electric heating device provided by the present invention provides support and protection for the heating component by setting a fixing component, preventing the impact force generated when carbon dioxide does work from affecting the stability of the heating component, thereby improving the safety and stability of the electric heating device in use. The fixing component includes a support rod, an upper fixing flange, and a lower fixing flange. The support rod is connected to the upper and lower fixing flanges, which are used to fix the position of the support rod. The upper fixing flange is connected to the connecting flange, thereby connecting the heating component and the fixing component to the connecting flange. The support rod is arranged around the heating component, thereby providing support and protection for the heating component. The support rod is set with a stepped section, which is engaged with a fastening nut to fix the lower connecting section in the lower support hole, thereby preventing the support rod from shifting when subjected to the huge impact force of carbon dioxide, providing effective support and protection for the heating component, and preventing the heating component from being damaged. The heating component is arranged along the axial direction of the shell, reducing the radial impact force of carbon dioxide on the heating component, reducing the probability of the heating component being damaged by the impact force, and increasing the number of uses and service life of the heating component.

[0044] (3) The carbon dioxide liquid heating method provided by the present invention can add carbon dioxide liquid through heating components without using chemical reagents. The heating efficiency and heating area of ​​the carbon dioxide liquid are improved by the series-connected heat release units, which enable the carbon dioxide liquid to be heated quickly and generate huge impact force to do work. Compared with the heating method using chemical reagents, it uses clean energy for heating and can be reused. There is no waste generated by chemical reaction. It has the characteristics of safety, greenness and high efficiency, and is convenient to use and simple to operate.

[0045] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained through the embodiments described and the accompanying drawings, which are particularly pointed out. Attached Figure Description

[0046] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0047] Figure 1 This is a schematic diagram of the overall structure of the electric heating device for the high-pressure carbon dioxide fracturing machine according to Embodiment 1 of the present invention.

[0048] Figure 2 This is a schematic diagram of the internal structure of the electric heating device for a high-pressure carbon dioxide fracturing machine according to Embodiment 1 of the present invention.

[0049] Figure 3 This is a partial structural schematic diagram of the heating assembly according to Embodiment 1 of the present invention;

[0050] Figure 4 This is a schematic diagram of the fixing component according to Embodiment 1 of the present invention;

[0051] Figure 5 This is a schematic diagram of the support rod according to Embodiment 1 of the present invention;

[0052] Figure 6 This is a schematic diagram of the upper fixed flange according to Embodiment 1 of the present invention;

[0053] Figure 7 This is a schematic diagram of the connection between the upper fixed flange and the connecting flange in Embodiment 1 of the present invention;

[0054] Figure 8 This is a schematic diagram of the lower fixed flange according to Embodiment 1 of the present invention;

[0055] Figure 9 This is a schematic flowchart of the heating method for liquid carbon dioxide according to Embodiment 2 of the present invention.

[0056] Figure label:

[0057] 1-Electrode; 2-Connecting flange; 21-Through hole; 22-Second threaded post; 3-Heating assembly; 31-Inner heating tube; 32-Outer heating tube; 33-Outer connector; 34-Inner connector; 4-Outer shell; 41-Shell; 42-Fragment valve; 5-Fixing assembly; 51-Support rod; 511-Upper connecting section; 512-Intermediate section; 513-Terraced section; 514-Lower connecting section; 52-Upper fixed flange; 521-Upper flange; 522-Upper insulating hole; 523-Electrode hole; 524-Upper support hole; 525-First threaded post; 5251-Threaded sleeve; 5252-Fastening threaded ring; 53-Lower fixed flange; 531-Lower flange; 532-Lower insulating hole; 533-Lower support hole. Detailed Implementation

[0058] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of the present invention and are used together with the invention to illustrate the principles of the invention.

[0059] Example 1

[0060] This embodiment provides an electric heating device for a high-pressure carbon dioxide fracturing machine, such as... Figures 1-3As shown, it includes an electrode 1, a connecting flange 2, a heating assembly 3, and a housing 4. The connecting flange 2 is connected to the housing 4 to seal the housing 4. The heating assembly 3 is connected to the connecting flange 2 and placed inside the housing 4. The electrode 1 is connected to the heating assembly 3. The electrode 1 is connected to a power source through a wire to supply energy to the heating assembly 3, so that the heating assembly 3 releases heat to heat the liquid carbon dioxide.

[0061] like Figure 1 As shown, the outer casing 4 includes a housing 41 and a fragmentation valve 42. The housing 41 is connected to the fragmentation valve 42. The fragmentation valve 42 is used to seal the housing 41 and ruptures to release carbon dioxide when the pressure inside the housing 41 reaches a threshold. The shock wave generated by the release of carbon dioxide is used to achieve blasting. The fragmentation valve 42 is prior art and will not be described in detail here.

[0062] For example, the rupture valve 42 ruptures when the pressure inside the housing 41 reaches 200-300 MPa, releasing carbon dioxide to do work.

[0063] like Figure 4 As shown, a through hole 21 is provided on the connecting flange 2. The electrode 1 passes through the through hole 21 and is connected to the heating component 3. An insulating layer is provided inside the through hole 21 to insulate the electrode 1. After the electrode 1 is inserted into the through hole 21, insulating sealant is injected to ensure that the inside of the housing 41 is in a sealed state.

[0064] like Figures 2-3 As shown, the heating element 3 is arranged along the axial direction of the housing 41 to prevent radial tension from being exerted on the heating element 3 during carbon dioxide work, thus avoiding damage to the heating element 3. Two heating elements 3 form a heat release unit, and multiple heat release units are configured. Figure 3 As shown, the heating assembly 3 includes an inner heating tube 31 and an outer heating tube 32. The heat dissipation unit is provided with an outer connector 33 and an inner connector 34. The inner heating tube 31 is disposed inside the outer heating tube 32. One end of the inner heating tube 31 extends out of the outer heating tube 32, and the other end is disposed inside the outer heating tube 32 and electrically connected to the outer heating tube 32. In the same heat dissipation unit, the outer heating tubes 32 are electrically connected to each other through the outer connector 33. In different heat dissipation units, the inner heating tubes 31 are electrically connected through the inner connector 34.

[0065] It is worth noting that there is no connection between the inner heating tubes 31 in the same heat dissipation unit; and there is no connection between the outer heating tubes 32 in different heat dissipation units, so that the current passes through the inner heating tubes 31 and the outer heating tubes 32, and connects multiple heat dissipation units in series.

[0066] It is understandable that the inner heating tube 31 of the first heat-releasing unit is connected to the positive electrode of the electrode 1, and the inner heating tube 31 of the last heat-releasing unit is connected to the negative electrode of the electrode 1, thereby connecting the heating component 3 to the electrode 1, and making the heat-releasing units form a closed loop in series.

[0067] When the heating component 3 is powered on, the current is transferred from the inner heating tube 31 of the first heat-releasing unit to the outer heating tube 32, and then through the outer connector 33 to another outer heating tube 32. The current is then transferred through the other outer heating tube 32 to the inner heating tube 31 inside the other outer heating tube 32, and then through the inner connector 34 to the inner heating tube 31 of the next heat-releasing unit. Finally, the current is transferred to the negative electrode of the electrode 1, forming a closed circuit. This connects multiple heat-releasing units in series, improving the power and heat release effect of the heating component 3, and enabling the carbon dioxide liquid to be heated quickly.

[0068] Preferably, the internal heating tube 31 and the external heating tube 32 have the same power to avoid uneven heating of the carbon dioxide liquid.

[0069] Preferably, the inner heating tube 31 and the outer heating tube 32 are made of an iron-cobalt-aluminum-molybdenum alloy, which enables the inner heating tube 31 and the outer heating tube 32 to withstand a large current.

[0070] Preferably, the inner heating tube 31 and the outer heating tube 32 are provided with multiple fine holes, so that the carbon dioxide liquid can flow between the inner heating tube 31 and the outer heating tube 32 through the fine holes, thereby increasing the contact area between the carbon dioxide liquid and the heating component 3 and increasing the heat transfer efficiency of the carbon dioxide liquid.

[0071] By setting the inner heating tube 31 and the outer heating tube 32, the heat release effect can be increased and the heat release speed can be accelerated, realizing the series connection of the heating components 3, so that the heating components 3 can release heat quickly and stably.

[0072] Furthermore, such as Figure 4 As shown, the electric heating device for the high-pressure carbon dioxide fracturing machine also includes a fixing component 5, which is disposed inside the housing 41 and is used to fix the heating component 3.

[0073] The fixing assembly 5 includes a support rod 51, an upper fixing flange 52, and a lower fixing flange 53. The support rod 51 is connected to the upper fixing flange 52 and the lower fixing flange 53, which are used to fix the position of the support rod 51. The upper fixing flange 52 is connected to the connecting flange 2, thereby connecting the heating assembly 3 and the fixing assembly 5 to the connecting flange 2. The support rod 51 is arranged around the heating assembly 3, thereby providing support and protection for the heating assembly 3 and preventing the impact force generated when carbon dioxide does work from affecting the stability of the heating assembly 3 or even damaging it.

[0074] like Figure 5As shown, the support rod 51 includes an upper connecting section 511, a middle section 512, a stepped section 513, and a lower connecting section 514. The upper connecting section 511 is threaded. One end of the upper connecting section 511 is connected to the upper fixing flange 52 by a fastening nut, and the other end is connected to the middle section 512. The middle section 512 is connected to the stepped section 513. The stepped section 513 is connected to the lower connecting section 514. The diameter of the stepped section 513 is larger than that of the lower connecting section 514. The lower connecting section 514 is threaded and is connected to the lower fixing flange 53 by a fastening nut.

[0075] like Figures 6-7 As shown, the upper fixed flange 52 includes an upper flange 521, an upper insulating hole 522, an electrode hole 523, an upper support hole 524, and a first threaded post 525. The upper flange 521 is connected to the first threaded post 525. A second threaded post 22 is provided on the connecting flange 2. A threaded sleeve 5251 is provided on the first threaded post 525. The threaded sleeve 5251 is used to connect the first threaded post 525 and the second threaded post 22, thereby connecting the upper fixed flange 52 to the connecting flange 2.

[0076] The upper flange 521 is provided with an upper insulating hole 522, an electrode hole 523 and an upper support hole 524. The upper insulating hole 522 is used to install the heating component 3. The upper insulating hole 522 cooperates with the inner heating tube 31 that is not connected to the electrode 1. The inner heating tube 31 that is not connected to the electrode 1 enters the upper insulating hole 522 and connects to the upper flange 521. The electrode 1 passes through the electrode hole 523 and connects to the inner heating tube 31. The upper connecting section 511 passes through the upper support hole 524 and is fixed to the upper flange 521 by a fastening nut.

[0077] It should be noted that the positions of the two inner heating tubes 31 connected to the electrode 1 are matched with the electrode hole 523. The electrode 1 passes through the electrode hole 523 and is connected to the inner heating tube 31. The other inner heating tubes 31 are inserted into the upper insulating hole 522 and connected to the upper flange 521.

[0078] Preferably, the upper fixed flange 52 further includes a fastening threaded ring 5252, which is threadedly connected to the second threaded post 22 to fix the threaded sleeve 5251, thereby fastening the connection between the upper flange 521 and the connecting flange 2.

[0079] Insulating rings are provided inside the upper insulating hole 522 and the electrode hole 523. For example, the insulating rings are made of zirconium oxide or alumina.

[0080] like Figure 8As shown, the lower fixed flange 53 includes a lower flange 531, a lower insulating hole 532, and a lower support hole 533. The lower insulating hole 532 and the lower support hole 533 are located on the lower flange 531. The lower insulating hole 532 mates with the lower connecting section 514, which passes through the lower support hole 533, causing the stepped section 513 to engage with the lower flange 531. The lower connecting section 514 is fixed to the lower flange 531 by a fastening nut. The stepped section 513, in conjunction with the fastening nut, fixes the lower connecting section 514 within the lower support hole 533. This prevents displacement of the support rod 51 under the immense impact force of carbon dioxide, providing effective support and protection for the heating assembly 3 and preventing damage to it. The lower insulating hole 532 mates with the external heating tube 32, fixing the external heating tube 32 within the lower insulating hole 532. An insulating ring is installed within the lower insulating hole 532.

[0081] Example 2

[0082] This embodiment provides a method for heating liquid carbon dioxide, using the high-pressure carbon dioxide fracturing electric heating device from Embodiment 1, such as... Figure 9 As shown, it includes the following steps:

[0083] S1: Connect electrode 1.

[0084] Specifically, in step S1, a through hole 21 is provided on the connecting flange 2, and an insulating layer is provided inside the through hole 21. The electrode 1 is inserted into the through hole 21, and sealant is injected into the through hole 21 to make the through hole 21 in a sealed state.

[0085] S2: Connect heating component 3.

[0086] Furthermore, step S2 specifically includes:

[0087] S21: Connect the inner heating tube 31 and the upper connecting section 511 to the upper fixed flange 52;

[0088] S22: Connect the external heating tube 32 and the lower connecting section 514 to the lower fixed flange 53.

[0089] Specifically, in step S21, the position of the inner heating tube 31 that needs to be connected to electrode 1 is aligned with the electrode hole 523, and the inner heating tube 31 that does not need to be connected to electrode 1 is inserted into the upper insulating hole 522 and fixed. The upper connecting section 511 is inserted into the upper support hole 524, and the position of the connecting section 511 is fixed by tightening the nut, so that the connecting section 511 is connected to the upper flange 521.

[0090] For example, the internal heating element 31 is fixed in the upper insulating hole 522 by bolts.

[0091] Specifically, in step S22, the lower connecting section 514 is inserted into the lower support hole 533, and the position of the lower connecting section 514 is fixed by the fastening nut, so that the ladder section 513 cooperates with the fastening nut to fix the lower connecting section 514 in the lower support hole 533. The external heating tube 32 is inserted into the lower insulation hole 532 to fix the external heating tube 32 in the lower insulation hole 532.

[0092] For example, an installation flange is provided on the external heating tube 32, and the lower insulation hole 532 cooperates with the installation flange to fix the external heating tube 32 in the lower insulation hole 532.

[0093] S3: Connect electrode 1 to heating component 3.

[0094] Furthermore, step S3 specifically includes:

[0095] S31: Connect electrode 1 to internal heating tube 31;

[0096] S32: Connect the upper fixed flange 52 to the connecting flange 2.

[0097] Specifically, in step S31, the positive and negative electrodes of electrode 1 are passed through electrode hole 523 and then connected to the inner heating tube 31 of the first heat dissipation unit and the inner heating tube 31 of the last heat dissipation unit, respectively.

[0098] Specifically, in step S32, the threaded sleeve 5251 is rotated to connect the first threaded post 525 and the second threaded post 22, and the threaded ring 5252 is rotated to tighten the connection between the upper flange 521 and the connecting flange 2.

[0099] S4: Connect the connecting flange 2 to the housing 4.

[0100] Specifically, after injecting liquid carbon dioxide into the housing 41, the connecting flange 2 is connected to the housing 41 to seal the liquid carbon dioxide inside the housing 41, so that the heating component 3 comes into contact with the liquid carbon dioxide.

[0101] S5: Place the device into the pre-drilled hole;

[0102] Specifically, the electric heating device of the high-pressure carbon dioxide fracturing machine is placed in the reserved hole, and after the electrode 1 is connected to the power supply through the wire, the staff are organized to evacuate in an orderly manner.

[0103] S6: Electricity is used to heat carbon dioxide to do work.

[0104] Specifically, the control power supply supplies power to electrode 1. For example, the power supply is set to 400V and 500V. Electrode 1 and heating component 3 form a closed loop in series, causing heating component 3 to heat the liquid carbon dioxide. The pressure inside the shell 41 gradually increases until it breaks through the rupture valve 42, releasing carbon dioxide and using the impact force of carbon dioxide to do work.

[0105] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An electric heating device for a high-pressure carbon dioxide fracturing machine, characterized in that, It includes an electrode (1), a connecting flange (2), a heating assembly (3), and a housing (4). The connecting flange (2) is connected to the housing (4), the heating assembly (3) is connected to the connecting flange (2) and placed inside the housing (4), and the electrode (1) is connected to the heating assembly (3).

2. The electric heating device for a high-pressure carbon dioxide fracturing machine according to claim 1, characterized in that, The outer casing (4) includes a housing (41) and a fragment valve (42), the housing (41) being connected to the fragment valve (42), and the fragment valve (42) being used to close the housing (41).

3. The electric heating device for a high-pressure carbon dioxide fracturing machine according to claim 2, characterized in that, The heating component (3) is arranged along the axial direction of the housing (41).

4. The electric heating device for a high-pressure carbon dioxide fracturing machine according to claim 2, characterized in that, It also includes a fixing component (5), which is disposed inside the housing (41) for fixing the heating component (3).

5. The electric heating device for a high-pressure carbon dioxide fracturing machine according to claim 1, characterized in that, The connecting flange (2) is provided with a through hole (21), and the electrode (1) passes through the through hole (21) and is connected to the heating component (3).

6. The electric heating device for a high-pressure carbon dioxide fracturing machine according to claim 5, characterized in that, An insulating layer is provided inside the through hole (21) to insulate the electrode (1).

7. The electric heating device for a high-pressure carbon dioxide fracturing machine according to claim 6, characterized in that, The heating assembly (3) includes an inner heating tube (31) and an outer heating tube (32). The inner heating tube (31) is disposed inside the outer heating tube (32). One end of the inner heating tube (31) extends out from the outer heating tube (32), and the other end is disposed inside the outer heating tube (32) and electrically connected to the outer heating tube (32).

8. The electric heating device for a high-pressure carbon dioxide fracturing machine according to claim 7, characterized in that, The inner heating tube (31) and the outer heating tube (32) are made of an iron-cobalt-aluminum-molybdenum alloy.

9. The electric heating device for a high-pressure carbon dioxide fracturing machine according to claim 8, characterized in that, The inner heating tube (31) and the outer heating tube (32) are provided with multiple fine holes.

10. A method for heating liquid carbon dioxide, characterized in that, The high-pressure carbon dioxide fracturing device according to any one of claims 1-8 is used to heat the liquid carbon dioxide.

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