A flexible heat-saturating pipe long-term high-temperature heating device

Abstract

A flexible heat-scaling conduit for long-term high-temperature heating comprises a flexible heat-scaling conduit, an external heating system and an external cooling system; the flexible heat-scaling conduit comprises a flexible outer tube body and a flexible inner tube body; the flexible outer tube body is coaxially sleeved on the outside of the flexible inner tube body; the annular space between the flexible outer tube body and the flexible inner tube body is a cooling liquid channel; the internal space of the flexible inner tube body is a heating liquid channel; a cooling liquid inlet and a cooling liquid outlet are respectively provided at both ends of the flexible outer tube body; the ends of the flexible inner tube body serve as a heating liquid inlet and a heating liquid outlet respectively; the external heating system is connected to the heating liquid channel through the heating liquid inlet and the heating liquid outlet; the external cooling system is connected to the cooling liquid channel through the cooling liquid inlet and the cooling liquid outlet; flexible heat sinks are evenly distributed on the outer surface of the flexible outer tube in the circumferential direction; temperature sensors are distributed on the outer surface of the flexible outer tube in the length direction of the tube body; and a plurality of flexible heat-scaling conduits are distributed in parallel inside the sample.

Description

Technical Field

[0001] The invention belongs to the technical field of rock mechanics testing, and in particular relates to a long-time high-temperature heating device for a flexible heat-saturating conduit. Background Art

[0002] As energy, resource, water conservancy, hydropower, transportation, and environmental projects continue to expand deeper, deep tunnels and mining projects have reached depths of 3,000 meters, while deep oil, gas, and geothermal reservoirs have reached depths of 10,000 meters. Deep rock masses also have the characteristic of high internal temperatures. According to the general geothermal warming law, the temperature rises by 3°C for every 100 meters of depth. Therefore, the original temperature of rock masses buried at a depth of 10,000 meters can be as high as 300°C.

[0003] High temperatures are a key factor in inducing disasters in deep rock engineering projects. For projects such as deep tunnels and deep mining, the surrounding rock is more severely damaged under the action of high temperatures, and rock bursts and large deformation disasters are frequent. High ground temperatures cause significant thermal damage to deep mine surfaces, resulting in reduced production efficiency and a significant increase in underground safety accidents. For deep oil and gas development, storage, and geothermal projects, high temperatures can have a significant impact on drilling fluids, causing instability in the drilling fluid system, and leaving the formation facing problems such as low drillability, short drill bit service life, low mechanical penetration rate, and low economic benefits. In addition, during the development process, the casing in the drilling well is more susceptible to deformation and damage due to the influence of high temperatures, resulting in low oil and gas extraction efficiency.

[0004] In summary, the high ground temperature in deep strata will lead to significant disasters in deep rock engineering, resulting in an increase in safety accidents, large property losses and significant delays in construction schedules.

[0005] In order to truly reflect the complex occurrence environment, complex geological conditions and engineering activities of deep strata, ultra-large deep engineering disaster physical simulation facilities can be constructed to meet the needs of indoor experiments on m-scale specimens, solve the size effect in indoor experiments on cm-scale specimens and km-scale field development, reveal the mechanism of deep rock engineering disasters, promote the establishment of core technologies such as safe and efficient excavation of deep rock engineering and safe and efficient development of deep oil and gas.

[0006] In ultra-large-scale deep engineering disaster physical simulation facilities, applying temperature to M-scale specimens is key to recreating the temperature distribution environment of deep rock mass engineering and accurately revealing the mechanisms of deep rock mass engineering disasters. Physical model tests use similar materials to simulate deep rock masses, but these materials have low strength. Therefore, applying temperature should minimize the impact on the model's mechanical properties, meaning the stiffness of the heating device should be as low as possible.

[0007] For ultra-large model specimens of m-scale dimensions, to achieve uniform temperature across the specimen surface and interior, the temperature application area must be increased to improve efficiency. Furthermore, to recreate the deep rock mass's occurrence environment, physical model testing must consider fluid application, so temperature application for ultra-large model specimens must consider waterproofing. Furthermore, to achieve uniform heating temperature for ultra-large model specimens, physical model testing must apply heating within the specimen, and the heating range should be maximized.

[0008] However, existing m-level similarity physical model test equipment does not consider the high ground temperature application capability at a burial depth of 10,000 meters, and therefore cannot achieve a high temperature environment of 300°C. Existing cm-level rock mechanics test equipment uses two heating methods: resistance wire heating and electromagnetic induction heating.

[0009] Resistance wire heating methods suffer from low heating efficiency, high energy dissipation, and difficulty with waterproofing, resulting in a service life of only 3-5 years. Furthermore, resistance wire heating frames are subject to high rigidity, which can affect the mechanical properties of very large model specimens.

[0010] As for the electromagnetic induction heating method, although the service life can reach 10-15 years, it also has the problem of high heater stiffness. The high-stiffness heater will also affect the mechanical properties of ultra-large model specimens, and electromagnetic heating also has the problem of waterproofing.

[0011] Therefore, the existing resistance wire heating method and electromagnetic induction heating method cannot be applied to ultra-large deep engineering disaster physical simulation facilities. Summary of the Invention

[0012] In response to the problems existing in the prior art, the present invention provides a long-term high-temperature heating device using a flexible heat-saturating conduit. The flexible heat-saturating conduit is introduced, and its material can be changed according to the strength of similar materials in the model. It has the characteristic of being stretchable and can adapt to the deformation of the sample during the physical model test without affecting the mechanical properties of the ultra-large model sample. The heating device of the present invention can directly apply temperature inside the ultra-large model sample, and the heating efficiency can reach more than 90%. The flexible heat-saturating conduit of the present invention has excellent waterproof performance and its service life can reach 15-20 years. By circulating a fast heat-conducting fluid inside the flexible heat-saturating conduit, the heat-conducting area can be effectively increased, ensuring uniform temperature at the distal and proximal ends of the heating device. The heating temperature of the flexible heat-saturating conduit reaches 400°C. , which can better restore the temperature environment of deep rock masses and meet the long-term heating requirements of ultra-large model specimens, with the temperature heating time lasting for 1 year; by using multiple parallel distributed flexible heat-saturating tubes inside the ultra-large model specimens for zoned heating, when a single flexible heat-saturating tube has temperature heating abnormalities, the heating liquid inside the flexible heat-saturating tube can be directly stopped, and by synchronously starting the supply of cooling liquid, precise dynamic temperature control is achieved, effectively ensuring the safety of ultra-large model specimen loading and internal temperature sensors; when a single heating tube breaks accidentally, the safety of the specimen model and the test device can be protected by deactivating the flexible heat-saturating tube, and the temperature of the area where single-tube heating has been stopped can be compensated by the flexible heat-saturating tube in the adjacent heating area.

[0013] In order to achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a flexible heat-equalizing conduit long-term high-temperature heating device, comprising a flexible heat-equalizing conduit, an external heating system and an external cooling system; the flexible heat-equalizing conduit comprises a flexible outer tube body and a flexible inner tube body; the flexible outer tube body is coaxially sleeved on the outside of the flexible inner tube body; the annular space between the flexible outer tube body and the flexible inner tube body serves as a cooling liquid channel; the internal space of the flexible inner tube body serves as a heating liquid channel; a cooling liquid inlet and a cooling liquid outlet are respectively provided at both ends of the flexible outer tube body; one end of the flexible inner tube body serves as a heating liquid inlet, and the other end of the flexible inner tube body serves as a heating liquid outlet; the external heating system is connected to the heating liquid channel through the heating liquid inlet and the heating liquid outlet; the external cooling system is connected to the cooling liquid channel through the cooling liquid inlet and the cooling liquid outlet.

[0014] The external heating system includes a heating liquid preparation box and a heating liquid injection pump; the liquid inlet of the heating liquid injection pump is connected to the liquid discharge port of the heating liquid preparation box through a stainless steel pipeline, the liquid outlet of the heating liquid injection pump is connected to the heating liquid inlet of the flexible inner tube body through a stainless steel pipeline, and the heating liquid discharge port of the flexible inner tube body is connected to the return liquid port of the heating liquid preparation box through a stainless steel pipeline.

[0015] The external cooling system includes a coolant preparation tank and a coolant injection pump; the liquid inlet of the coolant injection pump is connected to the discharge port of the coolant preparation tank through a stainless steel pipeline, the liquid outlet of the coolant injection pump is connected to the coolant inlet of the flexible outer tube body through a stainless steel pipeline, and the coolant discharge port of the flexible outer tube body is connected to the return port of the coolant preparation tank through a stainless steel pipeline.

[0016] Flexible heat sinks are evenly distributed along the circumferential direction on the outer surface of the flexible outer tube body. The flexible heat sinks increase the heat dissipation area of ​​the flexible heat-dissipating conduit, and the ultra-large model sample is quickly and evenly heated by the flexible heat-dissipating conduit provided with the flexible heat sinks.

[0017] The size of the flexible heat sink is set according to the heating requirements of the super-large model specimen.

[0018] Temperature sensors are distributed on the outer surface of the flexible outer tube along the length direction of the tube body. The temperature of the corresponding position inside the super-large model specimen is monitored in real time by the temperature sensors. The temperature data monitored by the temperature sensors are fed back to the external heating system and the external cooling system in real time. The external heating system adjusts the temperature of the heating liquid discharged from the heating liquid preparation box in real time according to the fed-back temperature data. The external cooling system adjusts the temperature of the coolant discharged from the coolant preparation box in real time according to the fed-back temperature data. The temperature of the corresponding position inside the super-large model specimen is precisely controlled by adjusting the temperatures of the heating liquid and the coolant.

[0019] The heating liquid output from the heating liquid preparation tank and the cooling liquid output from the cooling liquid preparation tank are both fluids with high thermal conductivity.

[0020] The materials of the flexible outer tube body and the flexible inner tube body are set according to the strength of the super-large model sample and the deformation of the sample during the test, and the length and diameter of the flexible outer tube body and the flexible inner tube body are set according to the volume of the super-large model sample.

[0021] The flexible heat-saturating pipes are pre-buried in the interior of the super-large model specimen. There are a number of pre-buried flexible heat-saturating pipes, which are distributed in parallel.

[0022] Beneficial effects of the present invention:

[0023] The flexible heat-saturating conduit long-term high-temperature heating device of the present invention introduces a flexible heat-saturating conduit, the material of which can be changed according to the strength of similar materials in the model, has the characteristic of being stretchable, can adapt to the deformation of the sample during the physical model test, and does not affect the mechanical properties of the super-large model sample; the heating device of the present invention can directly apply temperature inside the super-large model sample, and the heating efficiency can reach more than 90%; the flexible heat-saturating conduit of the present invention has excellent waterproof performance, and its service life can reach 15-20 years. By circulating a fast heat-conducting fluid inside the flexible heat-saturating conduit, the heat-conducting area can be effectively increased, ensuring uniform temperature at the distal and proximal ends of the heating device; the heating temperature of the flexible heat-saturating conduit reaches 400°C, which can better restore deep The temperature environment of the rock mass can meet the long-term heating of the super-large model specimen, and the temperature heating time can be sustained for 1 year; by using multiple parallel distributed flexible heat-saturating tubes inside the super-large model specimen for zoned heating, when a single flexible heat-saturating tube has a temperature heating abnormality, the heating liquid inside the flexible heat-saturating tube can be directly stopped, and by synchronously starting the supply of cooling liquid, precise dynamic temperature control is achieved, effectively ensuring the safety of the super-large model specimen loading and internal temperature sensors; when a single heating tube breaks accidentally, the safety of the specimen model body and the test device can be protected by deactivating the flexible heat-saturating tube, and the temperature of the area where the single-tube heating has been stopped can be compensated by the flexible heat-saturating tube in the adjacent heating area. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a flexible heat-saturating conduit long-term high-temperature heating device according to the present invention;

[0025] Figure 2 for Figure 1 Middle AA section view;

[0026] Figure 3 Schematic diagram of the cross section of an oversized model specimen embedded with a flexible heat-saturating pipe;

[0027] In the figure, 1 is a flexible outer tube body, 2 is a flexible inner tube body, 3 is a cooling liquid channel, 4 is a heating liquid channel, 5 is a cooling liquid inlet, 6 is a cooling liquid outlet, 7 is a heating liquid inlet, 8 is a heating liquid outlet, 9 is a heating liquid preparation box, 10 is a heating liquid injection pump, 11 is a cooling liquid preparation box, 12 is a cooling liquid injection pump, 13 is a flexible heat sink, 14 is an extra-large model specimen, and 15 is a temperature sensor. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figures 1 to 3As shown, a flexible heat-equalizing conduit long-term high-temperature heating device includes a flexible heat-equalizing conduit, an external heating system and an external cooling system; the flexible heat-equalizing conduit includes a flexible outer tube body 1 and a flexible inner tube body 2; the flexible outer tube body 1 is coaxially sleeved on the outside of the flexible inner tube body 2; the annular space between the flexible outer tube body 1 and the flexible inner tube body 2 serves as a cooling liquid channel 3; the internal space of the flexible inner tube body 2 serves as a heating liquid channel 4; a cooling liquid inlet 5 and a cooling liquid outlet 6 are respectively provided at both ends of the flexible outer tube body 1; one end of the flexible inner tube body 2 serves as a heating liquid inlet 7, and the other end of the flexible inner tube body 2 serves as a heating liquid outlet 8; the external heating system is connected to the heating liquid channel 4 through the heating liquid inlet 7 and the heating liquid outlet 8; the external cooling system is connected to the cooling liquid channel 3 through the cooling liquid inlet 5 and the cooling liquid outlet 6.

[0030] The external heating system includes a heating liquid preparation tank 9 and a heating liquid injection pump 10; the liquid inlet of the heating liquid injection pump 10 is connected to the liquid discharge port of the heating liquid preparation tank 9 through a stainless steel pipeline, the liquid outlet of the heating liquid injection pump 10 is connected to the heating liquid inlet 7 of the flexible inner tube body 2 through a stainless steel pipeline, and the heating liquid discharge port 8 of the flexible inner tube body 2 is connected to the return liquid port of the heating liquid preparation tank 9 through a stainless steel pipeline.

[0031] The external cooling system includes a coolant preparation tank 11 and a coolant injection pump 12; the liquid inlet of the coolant injection pump 12 is connected to the liquid discharge port of the coolant preparation tank 11 through a stainless steel pipeline, the liquid outlet of the coolant injection pump 12 is connected to the coolant inlet 5 of the flexible outer tube body 1 through a stainless steel pipeline, and the coolant discharge port 6 of the flexible outer tube body 1 is connected to the return liquid port of the coolant preparation tank 11 through a stainless steel pipeline.

[0032] Flexible heat sinks 13 are evenly distributed along the circumferential direction on the outer surface of the flexible outer tube body 1. The flexible heat sinks 13 increase the heat dissipation area of ​​the flexible heat-dissipating conduit, and the ultra-large model sample 14 is quickly and evenly heated by the flexible heat-dissipating conduit equipped with the flexible heat sinks 13.

[0033] The size of the flexible heat sink 13 is set according to the heating requirement of the super-large model sample 14 .

[0034] Temperature sensors 15 are distributed on the outer surface of the flexible outer tube body 1 along the length direction of the tube body. The temperature of the corresponding position inside the super-large model specimen 14 is monitored in real time by the temperature sensor 15. The temperature data monitored by the temperature sensor 15 is fed back to the external heating system and the external cooling system in real time. The external heating system adjusts the temperature of the heating liquid discharged from the heating liquid preparation box 9 in real time according to the fed-back temperature data. The external cooling system adjusts the temperature of the cooling liquid discharged from the cooling liquid preparation box 11 in real time according to the fed-back temperature data. By adjusting the temperatures of the heating liquid and the cooling liquid, the temperature of the corresponding position inside the super-large model specimen 14 is precisely controlled.

[0035] The heating liquid output from the heating liquid preparation tank 9 and the cooling liquid output from the cooling liquid preparation tank 11 are both fluids with high thermal conductivity.

[0036] The materials of the flexible outer tube body 1 and the flexible inner tube body 2 are set according to the strength of the super-large model sample 14 and the deformation of the sample during the test, and the length and diameter of the flexible outer tube body 1 and the flexible inner tube body 2 are set according to the volume of the super-large model sample 14.

[0037] The flexible heat-saturating pipes are pre-buried in the interior of the super-large model sample 14 . There are a number of pre-buried flexible heat-saturating pipes, which are distributed in parallel.

[0038] Before conducting the physical model test, an ultra-large model specimen 14 is first prepared by 3D printing. Before preparing the ultra-large model specimen 14 by 3D printing, similar materials need to be designed according to the rock mechanical parameters of the deep engineering simulated by the physical model test. After the design of the similar materials is completed, the basic physical and mechanical parameters of the similar materials, such as elastic modulus, Poisson's ratio, strength, and thermal conductivity, are measured.

[0039] Once the design and measurement of similar materials are complete, further simulation analysis of the mechanical behavior of the flexible heat-sinking pipes under the engineering activities simulated by the physical model test will be conducted based on the physical and mechanical properties of the designed similar materials. First, a simulation physical model for the physical model test is established. Different materials, diameters, lengths, and quantities of flexible heat-sinking pipes (flexible outer pipe body 1 and flexible inner pipe body 2) are designed, as well as the dimensions of the flexible heat sink 13. Then, several flexible heat-sinking pipes are embedded in the simulation physical model in a parallel distribution.

[0040] After integrating the flexible heat-sinking pipe with the simulation physical model, numerical simulations were conducted to simulate the temperature rise rate and uniformity of the material in the large-scale model specimen 14, using a given thermal conductivity of similar materials and varying the diameter, length, and number of flexible heat-sinking pipes. Comparative analysis was then conducted to optimize the size and number of the flexible heat-sinking pipes. Subsequently, numerical simulations were conducted to simulate the engineering activities associated with the physical model test, such as deep tunnel excavation or deep mining. The stress adjustments and deformations induced by these activities within the large-scale model specimen 14 were first analyzed without the flexible heat-sinking pipes. Then, using the optimized size and number of flexible heat-sinking pipes, the stress adjustments and deformations induced by the same engineering activities were simulated for different flexible heat-sinking pipe materials. The material of the flexible heat-sinking pipe was optimized, with the material that minimized the stress adjustments and deformations in the large-scale model specimen 14 selected. This material was then used as the material for the flexible heat-sinking pipes (flexible outer pipe body 1 and flexible inner pipe body 2).

[0041] After the material selection for the flexible heat-scaling conduit (flexible outer tube body 1 and flexible inner tube body 2) is completed, the flexible heat-scaling conduit is prepared based on the selected material and determined dimensions. The fluid tightness performance of the prepared flexible heat-scaling conduit is then tested to ensure that there is no leakage of the heating and cooling liquids inside the flexible heat-scaling conduit. Then, a small-scale similar model material is used to calibrate and measure basic parameters such as the mechanical properties and heating performance of the flexible heat-scaling conduit to ensure its safe and efficient use in ultra-large physical model tests.

[0042] After the mechanical properties and heating performance of the flexible heat-saturating conduit are verified and measured, the prepared flexible heat-saturating conduit is pre-buried in the super-large model sample 14 according to the movement direction of the 3D printing nozzle until the super-large model sample 14 is completed by printing and preparation. After that, all the pre-buried flexible heat-saturating conduits are connected to the external heating system and the external cooling system through stainless steel pipelines.

[0043] During the physical model test, after the loading of the super-large model specimen 14 is completed, room temperature heating liquid is introduced into the heating liquid channel 4 of the flexible heat equalizing tube through the heating liquid injection pump 10 of the external heating system, and room temperature cooling liquid is introduced into the cooling liquid channel 3 of the flexible heat equalizing tube through the cooling liquid injection pump 12 of the external cooling system.

[0044] After the normal temperature heating liquid and the normal temperature cooling liquid are introduced and maintained in circulation, the heating liquid preparation box 9 of the external heating system is first started to heat the heating liquid in the box. The temperature should be applied gradually according to a certain gradient. As the heating liquid circulates in the heating liquid channel 4, the temperature of the heating liquid will be transferred to the sample at the corresponding position in turn through the flexible inner tube body 2, the cooling liquid in the cooling liquid channel 3, the flexible outer tube body 1 and the flexible heat sink 13. The temperature at the corresponding position inside the sample is monitored in real time by the temperature sensor 15.

[0045] When the temperature data monitored by the temperature sensor 15 at a certain position exceeds the target temperature, the coolant preparation box 11 of the external cooling system is started, and the coolant preparation box 11 cools the coolant in the box. The cooled coolant circulates in the coolant channel 3, taking away the heat of the heating liquid in the heating liquid channel 4, until the temperature data monitored by the temperature sensor 15 at this position drops to the target temperature, thereby realizing dynamic and precise control of the temperature at any position inside the super-large model specimen 14.

[0046] During physical model testing of ultra-large model specimen 14, simulating deep tunneling and deep mining engineering activities, if a flexible heat-sinking tube is damaged due to a dynamic disaster simulation, the circulation of heating and cooling fluids in that tube can be directly stopped to protect the safety of ultra-large model specimen 14 and the test equipment. Although the damaged flexible heat-sinking tube no longer provides heating, the temperature at that location can still be compensated by other adjacent flexible heat-sinking tubes, thus ensuring temperature uniformity within ultra-large model specimen 14.

[0047] When the super-large model sample 14 is conducting oil and gas development and geothermal activity simulation during the physical model test, the fracturing fluid or cold water injected into the super-large model sample 14 will cause the internal temperature of the super-large model sample 14 to drop. In order to ensure that the internal temperature of the super-large model sample 14 is always at the target temperature, the heating liquid preparation box 9 of the external heating system will dynamically adjust the heating temperature of the heating liquid according to the feedback of the temperature sensor 15 to compensate for the lowered temperature inside the super-large model sample 14, thereby ensuring that the temperature environment and conditions inside the super-large model sample 14 are always within the set range.

[0048] In addition, it is necessary to determine the stress conditions of the flexible heat-saturating conduit in the super-large model specimen 14 based on the results of the load applied by the model. The heating liquid injection pump 10 and the cooling liquid injection pump 12 can assist in applying fluid pressure and dynamically adjust the internal pressure of the flexible heat-saturating conduit to achieve the stress requirements of the flexible heat-saturating conduit under different simulation working conditions.

[0049] The solutions in the embodiments are not intended to limit the patent protection scope of the present invention. Any equivalent implementation or modification that does not deviate from the present invention is included in the patent scope of this case.

Claims

1. A flexible heat-saturating pipe long-term high-temperature heating device, characterized in that: It includes a flexible heat-equalizing conduit, an external heating system and an external cooling system; the flexible heat-equalizing conduit includes a flexible outer tube body and a flexible inner tube body; the flexible outer tube body is coaxially sleeved on the outside of the flexible inner tube body; the annular space between the flexible outer tube body and the flexible inner tube body serves as a cooling liquid channel; the internal space of the flexible inner tube body serves as a heating liquid channel; a cooling liquid inlet and a cooling liquid outlet are respectively provided at both ends of the flexible outer tube body; one end of the flexible inner tube body serves as a heating liquid inlet, and the other end of the flexible inner tube body serves as a heating liquid outlet; the external heating system is connected to the heating liquid channel through the heating liquid inlet and the heating liquid outlet; the external cooling system is connected to the cooling liquid channel through the cooling liquid inlet and the cooling liquid outlet.

2. The flexible heat-saturating pipe long-term high-temperature heating device according to claim 1, characterized in that: The external heating system includes a heating liquid preparation box and a heating liquid injection pump; the liquid inlet of the heating liquid injection pump is connected to the liquid discharge port of the heating liquid preparation box through a stainless steel pipeline, the liquid outlet of the heating liquid injection pump is connected to the heating liquid inlet of the flexible inner tube body through a stainless steel pipeline, and the heating liquid discharge port of the flexible inner tube body is connected to the return liquid port of the heating liquid preparation box through a stainless steel pipeline.

3. The flexible heat-saturating pipe long-term high-temperature heating device according to claim 2, characterized in that: The external cooling system includes a coolant preparation tank and a coolant injection pump; the liquid inlet of the coolant injection pump is connected to the discharge port of the coolant preparation tank through a stainless steel pipeline, the liquid outlet of the coolant injection pump is connected to the coolant inlet of the flexible outer tube body through a stainless steel pipeline, and the coolant discharge port of the flexible outer tube body is connected to the return port of the coolant preparation tank through a stainless steel pipeline.

4. The flexible heat-saturating pipe long-term high-temperature heating device according to claim 1, characterized in that: Flexible heat sinks are evenly distributed along the circumferential direction on the outer surface of the flexible outer tube body. The flexible heat sinks increase the heat dissipation area of ​​the flexible heat-dissipating conduit, and the ultra-large model sample is quickly and evenly heated by the flexible heat-dissipating conduit provided with the flexible heat sinks.

5. The flexible heat-saturating pipe long-term high-temperature heating device according to claim 4, characterized in that: The size of the flexible heat sink is set according to the heating requirements of the super-large model specimen.

6. The flexible heat-saturating pipe long-term high-temperature heating device according to claim 3, characterized in that: Temperature sensors are distributed on the outer surface of the flexible outer tube along the length direction of the tube body. The temperature of the corresponding position inside the super-large model specimen is monitored in real time by the temperature sensors. The temperature data monitored by the temperature sensors are fed back to the external heating system and the external cooling system in real time. The external heating system adjusts the temperature of the heating liquid discharged from the heating liquid preparation box in real time according to the fed-back temperature data. The external cooling system adjusts the temperature of the coolant discharged from the coolant preparation box in real time according to the fed-back temperature data. The temperature of the corresponding position inside the super-large model specimen is precisely controlled by adjusting the temperatures of the heating liquid and the coolant.

7. The flexible heat-saturating pipe long-term high-temperature heating device according to claim 3, characterized in that: The heating liquid output from the heating liquid preparation tank and the cooling liquid output from the cooling liquid preparation tank are both fluids with high thermal conductivity.

8. The flexible heat-saturating pipe long-term high-temperature heating device according to claim 1, characterized in that: The materials of the flexible outer tube body and the flexible inner tube body are set according to the strength of the super-large model sample and the deformation of the sample during the test, and the length and diameter of the flexible outer tube body and the flexible inner tube body are set according to the volume of the super-large model sample.

9. The flexible heat-saturating pipe long-term high-temperature heating device according to claim 1, characterized in that: The flexible heat-saturating pipes are pre-buried in the interior of the super-large model specimen. There are a number of pre-buried flexible heat-saturating pipes, which are distributed in parallel.

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