High-temperature three-axis rapid heating device and using method thereof

Abstract

The invention discloses a high-temperature three-axis rapid heating device which mainly comprises a high-temperature and high-pressure experiment module, an experiment module connector, a heating sleeve, a heat preservation sleeve, a hot oil circulation system and a pressure applying system, and the hot oil circulation system and the pressure applying system are connected with the high-temperature and high-pressure experiment module through the experiment module connector. The high-temperature and high-pressure experiment module is heated through the heating sleeve, and the heat preservation sleeve is combined for heat preservation. The invention further provides a using method of the high-temperature three-axis rapid heating device. Compared with the prior art, the high-temperature three-axis rapid heating device has the advantages that the experiment efficiency is improved, hot oil circulation and the heating sleeve are combined for heating, the heating efficiency is improved, and the highest experiment temperature is broken through.

Description

Technical Field

[0001] The present invention relates to the field of rock test devices, and particularly to a rapid heating device for high-temperature triaxial tests and a method for using the same. Background Art

[0002] Temperature is one of the important factors affecting the mechanical properties of rocks. Real-time high-temperature triaxial experiments are widely used in fields such as nuclear waste storage, geothermal resource development, oil and gas exploration, etc., and can provide a theoretical basis for resource development, disaster prediction, and new material research.

[0003] The heating methods for real-time high temperature in conventional triaxial experiments are divided into two types: external heating and internal heating. The internal heating method generally involves directly heating the confining pressure medium by setting heating rods inside the experimental chamber. The advantage is a relatively fast heating rate, but there are problems such as difficult heating control and uneven heating of the medium. Therefore, this heating method is rarely used in experiments with high precision requirements; the external method is to wrap a heating jacket outside the experimental chamber to make the entire experimental chamber in a high-temperature state. Its advantages are a stable heating rate and uniform heating of the rock, but there are also problems such as a low heating rate and a long heating-up time. At the same time, it is also limited by the maximum usable temperature of the heating jacket, and the maximum test temperature is also limited by this. For both heating methods, the oil drainage operation needs to wait for the oil temperature to naturally cool to room temperature before it can be carried out, resulting in low experimental efficiency.

[0004] Therefore, how to provide a rapid heating device for high-temperature triaxial tests, enabling it to be heated evenly and achieving the technical effects of increasing the heating rate and breaking through the maximum heating temperature, is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0005] In view of the problems existing in the prior art, the technical problem to be solved by the present invention is to provide a rapid heating device for high-temperature triaxial tests, enabling it to be heated evenly and achieving the technical effects of increasing the heating rate and breaking through the maximum heating temperature.

[0006] To achieve the above object, the present invention provides a rapid heating device for high-temperature triaxial, and the rapid heating device for high-temperature triaxial includes: a high-temperature and high-pressure experimental chamber, an experimental cavity is provided inside the high-temperature and high-pressure experimental chamber, a first channel and a second channel are provided at the bottom of the high-temperature and high-pressure experimental chamber, a third channel is provided at the top of the high-temperature and high-pressure experimental chamber, the first channel and the second channel are respectively communicated with the bottom of the experimental cavity, and the third channel is communicated with the top of the experimental cavity; an experimental chamber joint, the experimental chamber joint includes an oil delivery component and an oil return component, the oil delivery component is connected to the first channel, the oil return component includes an oil return inlet and a circulating hot oil outlet, and the oil return inlet is connected to the third channel; a heating jacket, the heating jacket is sleeved on the periphery of the high-temperature and high-pressure experimental chamber, and the heating jacket is detachably connected to the high-temperature and high-pressure experimental chamber; a heat preservation jacket, the heat preservation jacket is sleeved on the periphery of the heating jacket, and the heat preservation jacket is detachably connected to the heating jacket; a hot oil circulation system, an output end of the hot oil circulation system is connected to the oil delivery component, and an input end of the hot oil circulation system is connected to the circulating hot oil outlet; a pressure application system, an output end of the pressure application system is connected to the oil delivery component.

[0007] In the first aspect, the oil delivery component includes: an oil delivery outlet, the oil delivery outlet is connected to the first channel; a circulating hot oil inlet, the circulating hot oil inlet is connected to the output end of the hot oil circulation system; a confining pressure loading port, the confining pressure loading port is connected to the output end of the pressure application system; wherein, the oil delivery outlet is respectively communicated with the circulating hot oil inlet and the confining pressure loading port.

[0008] In the first aspect, the hot oil circulation system includes: a high-temperature oil tank; a heating rod, the heating rod is arranged inside the high-temperature oil tank; a first liquid level sensor, the first liquid level sensor is arranged in the high-temperature oil tank; a first temperature sensor, the first temperature sensor is arranged in the high-temperature oil tank; a heating circulation pipeline, a first valve is arranged on the heating circulation pipeline, one end of the heating circulation pipeline is connected to the high-temperature oil tank, and a first pressure gauge is arranged on a side of the first valve away from the high-temperature oil tank; a pressure relief and safety pipeline, a one-way valve is arranged on the pressure relief and safety pipeline, one end of the pressure relief and safety pipeline corresponding to the output end of the one-way valve is connected to the high-temperature oil tank, and one end of the pressure relief and safety pipeline corresponding to the input end of the one-way valve is connected to the other end of the heating circulation pipeline.

[0009] In a first aspect, the hot oil circulation system further includes a high-temperature oil filling pipeline, and the high-temperature oil filling pipeline includes: a first oil filling pipeline, on which a high-temperature pump is provided; one end of the first oil filling pipeline is connected to the high-temperature oil tank; a second oil filling pipeline, one end of the second oil filling pipeline is connected to the other end of the first oil filling pipeline; the connection end of the second oil filling pipeline and the first oil filling pipeline is connected to the connection end of the heating circulation pipeline and the pressure relief safety pipeline, the other end of the second oil filling pipeline is connected to the circulating hot oil inlet, and a second valve is provided at the other end of the second oil filling pipeline.

[0010] In a first aspect, the hot oil circulation system further includes a high-temperature oil return pipeline, and the high-temperature oil return pipeline includes: a first high-temperature oil return pipeline, one end of the first high-temperature oil return pipeline is connected to the circulating hot oil outlet, and a third valve is provided at one end of the first high-temperature oil return pipeline; a second high-temperature oil return pipeline, one end of the second high-temperature oil return pipeline is connected to the other end of the first high-temperature oil return pipeline, and the other end of the second high-temperature oil return pipeline is connected to the high-temperature oil tank; a fourth valve is provided at one end of the second high-temperature oil return pipeline, and a liquid filling and exhaust connection joint is provided on the side of the fourth valve close to the first oil return pipeline.

[0011] In a first aspect, the hot oil circulation system further includes an oil drainage assembly, and the output end of the oil drainage assembly is connected to the connection end of the first high-temperature oil return pipeline and the second high-temperature oil return pipeline.

[0012] In a first aspect, the oil drainage assembly includes: an air compressor; an air compressor valve, the input end of the air compressor valve is connected to the air compressor through an air pipeline, and a second pressure gauge is provided on the air pipeline; an air pressure pipeline, one end of the air pressure pipeline is connected to the output end of the air compressor valve, and the other end of the air pressure pipeline is connected to the connection end of the first high-temperature oil return pipeline and the second high-temperature oil return pipeline; a fifth valve and a liquid drainage joint are provided on the air pressure pipeline, and the liquid drainage joint is located on the side of the fifth valve away from the air compressor valve.

[0013] In a first aspect, the pressure application system includes: a normal temperature oil tank, the bottom of the normal temperature oil tank is connected to the high temperature oil tank through an oil tank connection pipe, and a sixth valve is arranged on the oil tank connection pipe; a second liquid level sensor disposed in the normal temperature oil tank; a second temperature sensor disposed in the normal temperature oil tank; a pressure application pipeline, one end of the pressure application pipeline is connected to the normal temperature oil tank, and the other end of the pressure application pipeline is connected to the confining pressure loading port; a confining pressure pump, a seventh valve, an eighth valve and a pressure sensor are arranged on the pressure application pipeline, the seventh valve is located on the side of the confining pressure pump close to the normal temperature oil tank, the eighth valve is located on the side of the confining pressure pump away from the normal temperature oil tank, and the pressure sensor is located between the eighth valve and the confining pressure loading port.

[0014] In a first aspect, the high temperature and high pressure experimental chamber further includes a thermocouple, the thermocouple is located inside the experimental cavity, and the connecting wire of the thermocouple passes through the second channel and is connected to the corresponding data receiver; the connecting wire is hermetically connected to the second channel.

[0015] The present invention also provides a usage method of a rapid heating device for high temperature triaxial, the usage method is used for the above-mentioned rapid heating device for high temperature triaxial, and the usage method includes:

[0016] After placing the specimen in the experimental cavity, close the second valve, open the first valve and the high temperature pump, and at the same time set the highest temperature of the hot oil in the high temperature oil tank, the highest temperature of the hot oil in the high temperature oil tank is higher than the experimental target temperature, heat the oil in the high temperature oil tank through the heating rod to reach the set highest temperature; then close the first valve and the fifth valve, open the second valve, the third valve and the fourth valve to make the hot oil circulate between the experimental cavity and the high temperature oil tank; then turn on the heating jacket to raise the temperature of the heating jacket to the experimental target temperature; observe the internal temperature of the experimental cavity through the thermocouple, when the internal temperature of the experimental cavity reaches the experimental target temperature, close the second valve, the third valve and the high temperature pump, open the seventh valve, the confining pressure pump and the eighth valve to apply confining pressure to the specimen by injecting normal temperature oil into the experimental cavity, observe the pressure displayed by the pressure sensor, when it is monitored that the pressure reaches the target pressure, close the eighth valve and the confining pressure pump in sequence, and conduct a triaxial test; when the triaxial test is over, close the fourth valve, and then open the fifth valve, the air compressor valve, the air compressor, the third valve and the first valve to blow the hot oil inside the experimental cavity back into the high temperature oil tank;

[0017] Or,

[0018] After placing the specimen in the experimental cavity, set the maximum temperature of the hot oil in the high-temperature oil tank and the maximum temperature of the heating jacket. The maximum temperature of the hot oil in the high-temperature oil tank is higher than the experimental target temperature, and the maximum temperature of the heating jacket is the experimental target temperature. Then close the first valve and the fifth valve, and open the second valve, the third valve, the fourth valve, the high-temperature pump, and the heating jacket. Observe the internal temperature of the experimental cavity through the thermocouple. When the internal temperature of the experimental cavity reaches the experimental target temperature, close the second valve, the third valve, and the high-temperature pump, and open the seventh valve, the confining pressure pump, and the eighth valve to apply confining pressure to the specimen by injecting normal-temperature oil into the experimental cavity. Observe the pressure displayed by the pressure sensor. When the monitored pressure reaches the target pressure, close the eighth valve and the confining pressure pump in sequence, and conduct a triaxial test. After the triaxial test is completed, close the fourth valve, and then open the fifth valve, the air compressor valve, the air compressor, the third valve, and the first valve to blow the hot oil inside the experimental cavity back into the high-temperature oil tank.

[0019] Beneficial effects:

[0020] The present invention provides a rapid heating device for high-temperature triaxial tests. The device mainly includes a high-temperature and high-pressure experimental chamber, an experimental chamber joint, a heating jacket, a heat-insulating jacket, a hot oil circulation system, and a pressure application system. The hot oil circulation system and the pressure application system are respectively connected to the high-temperature and high-pressure experimental chamber through the experimental chamber joint. The high-temperature and high-pressure experimental chamber is heated by the heating jacket and insulated in combination with the heat-insulating jacket to further keep the internal temperature of the high-temperature and high-pressure experimental chamber balanced. The internal of the high-temperature and high-pressure experimental chamber has an experimental cavity, which is used to place the specimen and accommodate the introduced oil so that the introduced oil can wrap the specimen. When the hot oil circulation system works, the hot oil that reaches the preset temperature and is temperature-balanced enters the experimental cavity to wrap the specimen, and the temperature in the experimental cavity is made uniform and balanced during the circulation process. The heating jacket further heats the environment where the specimen is located, maintains the uniformity and stability of the temperature in the experimental cavity, enables the specimen to reach the experimental temperature, and at the same time can increase the maximum temperature that can be reached in the experimental cavity, and has a heat-insulating effect at the same time. After the specimen reaches the experimental temperature and is temperature-balanced, the pressure application system can be used to apply pressure to the experimental cavity to conduct a triaxial test. In summary, the rapid heating device for high-temperature triaxial tests of the present invention directly supplies hot oil to the experimental cavity through the hot oil circulation system, improves the experimental efficiency on the premise of ensuring the uniform and stable internal temperature of the experimental cavity, and at the same time combines the hot oil circulation and the heating jacket for heating to improve the heating efficiency and break through the maximum experimental temperature. Description of the drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 is a schematic structural diagram of the high-temperature and high-pressure experimental chamber and the experimental chamber joint of the present invention;

[0023] Figure 2 is a schematic connection diagram of the hot oil circulation system and the pressure application system of the present invention.

[0024] Reference numerals:

[0025] 1. High-temperature and high-pressure experimental chamber; 11. Experimental chamber body; 12. Experimental cavity; 13. First channel; 14. Second channel; 15. Third channel; 16. Thermocouple;

[0026] 2. Experimental chamber joint; 21. Oil transmission component; 211. Oil transmission outlet; 212. Circulating hot oil inlet; 213. Confining pressure loading port; 22. Oil return component; 221. Oil return inlet; 222. Circulating hot oil outlet;

[0027] 3. Heating jacket;

[0028] 4. Heat preservation jacket;

[0029] 501. High-temperature oil tank; 502. First liquid level sensor; 503. First temperature sensor; 504. Heating circulation pipeline; 505. First valve; 506. First pressure gauge; 507. Pressure relief safety pipeline; 508. Check valve; 509. High-temperature oil filling pipeline; 5091. First oil filling pipeline; 5092. High-temperature pump; 5093. Second oil filling pipeline; 5094. Second valve; 510. High-temperature oil return pipeline; 5101. First high-temperature oil return pipeline; 5102. Third valve; 5103. Second high-temperature oil return pipeline; 5104. Fourth valve; 5105. Liquid filling and exhaust connection joint; 511. Oil discharge component; 5111. Air compressor; 5112. Air compressor valve; 5113. Second pressure gauge; 5114. Air pressure pipeline; 5115. Fifth valve; 5116. Liquid discharge joint;

[0030] 601. Normal-temperature oil tank; 602. Sixth valve; 603. Second liquid level sensor; 604. Second temperature sensor; 605. Pressure application pipeline; 606. Confining pressure pump; 607. Seventh valve; 608. Eighth valve; 609. Pressure sensor. Detailed implementation manners

[0031] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of this specification, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this specification belong to the scope of protection of the present invention.

[0032] Embodiment 1

[0033] As Figures 1-2 shown, Embodiment 1 of the present invention provides a rapid heating device for high-temperature triaxial. The rapid heating device for high-temperature triaxial includes: a high-temperature and high-pressure experimental chamber 1, the high-temperature and high-pressure experimental chamber includes an experimental chamber body 11, an experimental cavity 12 is provided inside the experimental chamber body 11, a first channel 13 and a second channel 14 are provided at the bottom of the experimental chamber body 11, a third channel 15 is provided at the top of the experimental chamber body 11, the first channel 13 and the second channel 14 are respectively communicated with the bottom of the experimental cavity 12, and the third channel 15 is communicated with the top of the experimental cavity 12; an experimental chamber joint 2, the experimental chamber joint 2 includes an oil delivery assembly 21 and an oil return assembly 22, the oil delivery assembly 21 is connected to the first channel 13, the oil return assembly 22 includes an oil return inlet 221 and a circulating hot oil outlet 222, and the oil return inlet 221 is connected to the third channel 15; a heating sleeve 3, the heating sleeve 3 is sleeved outside the high-temperature and high-pressure experimental chamber 1, and the heating sleeve 3 is detachably connected to the high-temperature and high-pressure experimental chamber 1; a heat preservation sleeve 4, the heat preservation sleeve 4 is sleeved outside the heating sleeve 3, and the heat preservation sleeve 4 is detachably connected to the heating sleeve 3; a hot oil circulation system, the output end of the hot oil circulation system is connected to the oil delivery assembly 21, and the input end of the hot oil circulation system is connected to the circulating hot oil outlet 222; a pressure application system, the output end of the pressure application system is connected to the oil delivery assembly 21.

[0034] The present invention provides a rapid heating device for high-temperature triaxial tests. The device mainly includes a high-temperature and high-pressure test chamber, a test chamber joint, a heating jacket, a heat-insulating jacket, a hot oil circulation system, and a pressure application system. The hot oil circulation system and the pressure application system are respectively connected to the high-temperature and high-pressure test chamber through the test chamber joint. The heating jacket is used to heat the high-temperature and high-pressure test chamber and is combined with the heat-insulating jacket for heat preservation, further keeping the internal temperature of the high-temperature and high-pressure test chamber balanced. The high-temperature and high-pressure test chamber has an experimental cavity inside, which is used to place specimens and accommodate the introduced oil, so that the introduced oil can wrap the specimens. When the hot oil circulation system works, the hot oil that reaches the preset temperature and is temperature-balanced enters the experimental cavity to wrap the specimens, and the temperature in the experimental cavity is made uniform and balanced during the circulation process. The heating jacket further heats the environment where the specimens are located, maintains the uniform and stable temperature in the experimental cavity, enables the specimens to reach the experimental temperature, and at the same time can increase the maximum temperature that can be reached in the experimental cavity, and also has a heat preservation effect. After the specimens reach the experimental temperature and are temperature-balanced, the pressure application system can be used to apply pressure to the experimental cavity to conduct triaxial tests. In summary, the rapid heating device for high-temperature triaxial tests of the present invention directly supplies hot oil to the experimental cavity through the hot oil circulation system. On the premise of ensuring the uniform and stable internal temperature of the experimental cavity, the experimental efficiency is improved. At the same time, the combined use of hot oil circulation and the heating jacket improves the heating efficiency and breaks through the maximum experimental temperature.

[0035] In some possible implementation manners, the oil delivery assembly 21 includes: an oil delivery outlet 211, the oil delivery outlet 211 is connected to the first channel 13; a circulating hot oil inlet 212, the circulating hot oil inlet 212 is connected to the output end of the hot oil circulation system; a confining pressure loading port 213, the confining pressure loading port 213 is connected to the output end of the pressure application system; wherein, the oil delivery outlet 211 is respectively communicated with the circulating hot oil inlet 212 and the confining pressure loading port 213.

[0036] Specifically, during the process of heating the experimental cavity, the hot oil in the high-temperature oil tank passes through the circulating hot oil inlet, enters the experimental cavity through the oil delivery outlet and the first channel, and then is output to the high-temperature oil tank through the third channel, the oil return inlet, and the circulating hot oil outlet; during the pressure application stage, the oil in the normal-temperature oil tank enters the experimental cavity through the confining pressure loading port, the oil delivery outlet, and the first channel to apply confining pressure to the specimens in the experimental cavity.

[0037] In some possible implementation manners, the hot oil circulation system includes: a high-temperature oil tank 501; a heating rod disposed inside the high-temperature oil tank 501; a first liquid level sensor 502 disposed inside the high-temperature oil tank 501; a first temperature sensor 503 disposed inside the high-temperature oil tank 501; a heating circulation pipeline 504 provided with a first valve 505, one end of the heating circulation pipeline 504 is connected to the high-temperature oil tank 501, and a first pressure gauge 506 is disposed on the side of the first valve 505 away from the high-temperature oil tank 501; a pressure relief safety pipeline 507 provided with a check valve 508, one end of the pressure relief safety pipeline 507 corresponding to the output end of the check valve 508 is connected to the high-temperature oil tank 501, and one end of the pressure relief safety pipeline 507 corresponding to the input end of the check valve 508 is connected to the other end of the heating circulation pipeline 504.

[0038] Specifically, the heating rod is used to heat the oil in the high-temperature oil tank, the first liquid level sensor is used to monitor the height of the oil in the high-temperature oil tank, and the first temperature sensor is used to monitor the temperature of the oil in the high-temperature oil tank; a rapid heating device for a high-temperature triaxial of the present invention has two heating methods. The first method is to heat the hot oil in the high-temperature oil tank to a preset temperature first, then make the hot oil enter the experimental cavity for circulation, and then turn on the heating jacket to heat to the experimental temperature; the second method is to set the maximum temperature for heating the oil in the high-temperature oil tank and the experimental target temperature of the heating jacket at the same time, and turn on the oil circulation and the heating of the heating jacket at the same time; in the first method, during the process of heating and raising the temperature of the oil, in order to ensure uniform temperature inside the high-temperature oil tank, the internal circulation needs to be turned on, the first valve is opened, the second valve is closed, and the hot oil is made to flow back to the high-temperature oil tank through the heating circulation pipeline by the action of the high-temperature pump; the check valve is a 3 MPa check valve. During the process of the hot oil entering the experimental cavity, if problems such as blockage occur in the second oil filling pipeline, the pressure in the pipeline will increase. When the pressure in the pipeline exceeds 3 MPa, the check valve opens, and the hot oil flows back to the high-temperature oil tank through the pressure relief safety pipeline.

[0039] In some possible implementation manners, the hot oil circulation system further includes a high-temperature oil filling pipeline 509. The high-temperature oil filling pipeline 509 includes: a first oil filling pipeline 5091, on which a high-temperature pump 5092 is provided; one end of the first oil filling pipeline 5091 is connected to the high-temperature oil tank 501; a second oil filling pipeline 5093, one end of the second oil filling pipeline 5093 is connected to the other end of the first oil filling pipeline 5091; the connection end of the second oil filling pipeline 5093 and the first oil filling pipeline 5091 is connected to the connection end of the heating circulation pipeline 504 and the pressure relief safety pipeline 507, the other end of the second oil filling pipeline 5093 is connected to the circulating hot oil inlet 212, and a second valve 5094 is provided at the other end of the second oil filling pipeline 5093; the hot oil circulation system further includes a high-temperature oil return pipeline 510. The high-temperature oil return pipeline 510 includes: a first high-temperature oil return pipeline 5101, one end of the first high-temperature oil return pipeline 5101 is connected to the circulating hot oil outlet 222, and a third valve 5102 is provided at one end of the first high-temperature oil return pipeline 5101; a second high-temperature oil return pipeline 5103, one end of the second high-temperature oil return pipeline 5103 is connected to the other end of the first high-temperature oil return pipeline 5101, and the other end of the second high-temperature oil return pipeline 5103 is connected to the high-temperature oil tank 501; a fourth valve 5104 is provided at one end of the second high-temperature oil return pipeline 5103, and a liquid filling and exhaust connection joint 5105 is provided on the side of the fourth valve 5104 close to the first oil return pipeline 5101.

[0040] Specifically, during the process of hot oil circulating in the experimental cavity, the hot oil is pumped out from the high-temperature oil tank by the high-temperature pump, and successively passes through the first oil filling pipeline and the second oil filling pipeline to enter the experimental cavity; then the hot oil in the experimental cavity successively passes through the first high-temperature oil return pipeline and the second high-temperature oil return pipeline and returns to the high-temperature oil tank, achieving the circulation of hot oil in the experimental cavity; after the high-temperature triaxial experiment is completed, the oil in the experimental cavity and each pipeline needs to be discharged. In the present invention, the oil discharge is to squeeze the oil in the experimental cavity back to the high-temperature oil tank through the air pressure along the incoming path. In this process, the fourth valve needs to be closed, and the third valve, the second valve, and the first valve need to be opened; so that the oil is pressed back to the high-temperature oil tank.

[0041] In some possible implementation manners, the hot oil circulation system further includes an oil discharge assembly 511. The output end of the oil discharge assembly 511 is connected to the connection end of the first high-temperature oil return pipeline 5101 and the second high-temperature oil return pipeline 5103. The oil discharge assembly 511 includes: an air compressor 5111; an air compressor valve 5112. The input end of the air compressor valve 5112 is connected to the air compressor 5111 through an air pipeline, and a second pressure gauge 5113 is arranged on the air pipeline; an air pressure pipeline 5114. One end of the air pressure pipeline 5114 is connected to the output end of the air compressor valve 5112, and the other end of the air pressure pipeline 5114 is connected to the connection end of the first high-temperature oil return pipeline 5101 and the second high-temperature oil return pipeline 5103. A fifth valve 5115 and a liquid discharge joint 5116 are arranged on the air pressure pipeline 5114, and the liquid discharge joint 5116 is located on the side of the fifth valve 5115 away from the air compressor valve 5112.

[0042] Specifically, the air compressor works to generate air pressure on the first high-temperature oil return pipeline and the second high-temperature oil return pipeline. Close the fourth valve, open the third valve, the second valve, and the first valve. The oil in the second high-temperature oil return pipeline is extruded by the air pressure generated by the air compressor, so that the oil is sequentially extruded into the high-temperature oil tank through the second high-temperature oil return pipeline, the experimental cavity, the second oil filling pipeline, and the heating circulation pipeline. The oil discharge needs to be carried out when the confining pressure applied by the pressure application system is less than 20 MPa.

[0043] In some possible implementation manners, the pressure application system includes: a normal-temperature oil tank 601. The bottom of the normal-temperature oil tank 601 is connected to the high-temperature oil tank 501 through an oil tank connection pipe, and a sixth valve 602 is arranged on the oil tank connection pipe; a second liquid level sensor 603, which is arranged in the normal-temperature oil tank 601; a second temperature sensor 604, which is arranged in the normal-temperature oil tank 601; a pressure application pipeline 605. One end of the pressure application pipeline 603 is connected to the normal-temperature oil tank 601, and the other end of the pressure application pipeline 605 is connected to the confining pressure loading port 213. A confining pressure pump 606, a seventh valve 607, an eighth valve 608, and a pressure sensor 609 are arranged on the pressure application pipeline 605. The seventh valve 607 is located on the side of the confining pressure pump 606 close to the normal-temperature oil tank 601, the eighth valve 608 is located on the side of the confining pressure pump 606 away from the normal-temperature oil tank 601, and the pressure sensor 609 is located between the eighth valve 608 and the confining pressure loading port 213.

[0044] Specifically, when the oil level in either the high-temperature fuel tank or the normal-temperature fuel tank is insufficient, the two fuel tanks can be connected to each other through opening the sixth valve to supply oil to each other; the second liquid level sensor is used to monitor the height of the oil in the normal-temperature fuel tank, and the second temperature sensor is used to monitor the temperature of the oil in the normal-temperature fuel tank; by further introducing oil into the experimental cavity to increase the pressure in the experimental cavity, confining pressure is applied to the specimen; the pressure sensor is used to monitor the pressure of the experimental cavity.

[0045] In some possible implementation manners, the high-temperature and high-pressure experimental chamber 1 further includes a thermocouple 16, the thermocouple 16 is located inside the experimental cavity 12, and the connecting wire of the thermocouple 16 passes through the second channel 14 and is connected to a corresponding data receiver; the connecting wire is hermetically connected to the second channel 14.

[0046] Specifically, the thermocouple is used to monitor the temperature inside the experimental cavity.

[0047] Embodiment 2

[0048] As Figures 1-2 shown, Embodiment 2 of the present invention provides a usage method of a rapid heating device for high-temperature triaxial, and the usage method is used for the usage of a rapid heating device for high-temperature triaxial described in Embodiment 1. The usage method includes:

[0049] After placing the specimen in the experimental cavity, close the second valve, open the first valve and the high-temperature pump, and at the same time set the highest temperature of the hot oil in the high-temperature fuel tank, where the highest temperature of the hot oil in the high-temperature fuel tank is higher than the experimental target temperature. Heat the oil in the high-temperature fuel tank through the heating rod to reach the set highest temperature; then close the first valve and the fifth valve, open the second valve, the third valve, and the fourth valve to make the hot oil circulate between the experimental cavity and the high-temperature fuel tank; then turn on the heating jacket to raise the temperature of the heating jacket to the experimental target temperature; observe the internal temperature of the experimental cavity through the thermocouple. When the internal temperature of the experimental cavity reaches the experimental target temperature, close the second valve, the third valve, and the high-temperature pump, open the seventh valve, the confining pressure pump, and the eighth valve to apply confining pressure to the specimen by injecting normal-temperature oil into the experimental cavity, observe the pressure displayed by the pressure sensor. When it is monitored that the pressure reaches the target pressure, sequentially close the eighth valve and the confining pressure pump, and conduct a triaxial test; after the triaxial test is completed, close the fourth valve, and then open the fifth valve, the air compressor valve, the air compressor, the third valve, and the first valve to blow the hot oil inside the experimental cavity back into the high-temperature fuel tank;

[0050] Or,

[0051] After placing the specimen in the experimental cavity, set the maximum temperature of the hot oil in the high-temperature oil tank and the maximum temperature of the heating jacket. The maximum temperature of the hot oil in the high-temperature oil tank is higher than the experimental target temperature, and the maximum temperature of the heating jacket is the experimental target temperature. Then close the first valve and the fifth valve, and open the second valve, the third valve, the fourth valve, the high-temperature pump, and the heating jacket. Observe the internal temperature of the experimental cavity through the thermocouple. When the internal temperature of the experimental cavity reaches the experimental target temperature, close the second valve, the third valve, and the high-temperature pump, and open the seventh valve, the confining pressure pump, and the eighth valve to apply confining pressure to the specimen by injecting normal-temperature oil into the experimental cavity. Observe the pressure displayed by the pressure sensor. When the monitored pressure reaches the target pressure, close the eighth valve and the confining pressure pump in sequence, and conduct a triaxial test. After the triaxial test is completed, close the fourth valve, and then open the fifth valve, the air compressor valve, the air compressor, the third valve, and the first valve to blow the hot oil inside the experimental cavity back into the high-temperature oil tank.

[0052] Specifically, in the usage method of a rapid heating device for a high-temperature triaxial of the present invention, the heating method for the experimental cavity can be divided into two types. The first heating method in the usage method is to first heat the oil in the high-temperature oil tank through a heating rod. When the temperature of the hot oil in the high-temperature oil tank is uniform and reaches the set temperature, start the circulation of the hot oil between the high-temperature oil tank and the experimental cavity. By directly supplying the hot oil to the experimental cavity, on the premise of ensuring uniform temperature inside the experimental cavity, the experimental efficiency is improved; during the circulation of the hot oil, turn on the heating jacket to heat to the experimental target temperature, which has the function of heating and maintaining the temperature in the experimental cavity. Although the upper and lower ends of the experimental cavity are not wrapped with a heating jacket and a heat preservation jacket, through the heating treatment of the hot oil circulation and the heating jacket, the temperature inside the experimental cavity is maintained in a uniform and stable state, which can not only improve the heating efficiency but also break through the highest temperature that can be achieved in the experiment; during the process of heating the oil in the high-temperature oil tank with the heating rod, it is necessary to turn on the internal circulation, that is, close the second valve, open the first valve and the high-temperature pump to make the hot oil circulate inside the high-temperature oil tank, so that the oil in the high-temperature oil tank is fully heated, the oil is evenly heated, the temperature of the oil is ensured to be uniform, and the accuracy of the experimental temperature is improved. The first heating method in the above usage method is mainly applicable to the heating of the experimental target temperature below 200°C; the second heating method in the usage method is that the oil in the high-temperature oil tank starts to circulate between the high-temperature oil tank and the experimental cavity at the beginning of heating, and at the same time, set the highest heating temperature of the heating jacket and turn on the heating jacket for heating. The set highest heating temperature of the heating jacket is the experimental target temperature. By heating while circulating the oil and jointly heating with the heating jacket, the temperature inside the experimental cavity reaches the experimental target temperature. During this heating process, the actual heating object of the heating jacket is the high-temperature and high-pressure experimental chamber shell located outside the experimental cavity. The heating jacket and the high-temperature hot oil in the internal circulation continuously raise the temperature of the high-temperature and high-pressure experimental chamber shell inside and outside, absorbing the advantages of both internal and external heating, and greatly improving the heating rate and the highest heating temperature; among them, in both the first heating method and the second heating method, due to certain heat losses during the circulation of the hot oil in the pipeline, the set highest heating temperature of the oil in the high-temperature oil tank should be higher than the experimental target temperature of the experimental cavity; at the same time, the pipeline and the high-temperature oil tank in the hot oil circulation system are both wrapped with heat preservation materials to reduce the energy loss during the circulation of the hot oil. The pipelines in the hot oil circulation system can all be high-temperature resistant hoses, and the heat preservation material can be thick aerogel. 12 mm thick aerogel can be wrapped outside the high-temperature resistant hose and fixed with a silicone heat shrink sleeve. At the same time, to reduce the heat consumption of the high-temperature oil tank and improve the heating rate, 6 mm thick aerogel can be wrapped on the outer wall of the high-temperature oil tank; after the temperature inside the experimental cavity reaches the experimental target temperature, turn off the hot oil circulation. At this time, the heat dissipation of the high-temperature and high-pressure experimental chamber and the heating of the heating jacket form a dynamic balance of temperature, so that the temperature inside the experimental cavity during the experiment is stabilized at the experimental target temperature;Then, oil in the normal-temperature oil tank is introduced into the experimental cavity through a confining pressure pump to increase the pressure in the experimental cavity and apply a confining pressure to the specimen in the experimental cavity. When the confining pressure value reaches the required value for the experiment, a triaxial test is carried out. After the test, the hot oil in the experimental cavity is blown back into the high-temperature oil tank through the air pressure provided by the air compressor. This process needs to be carried out when the confining pressure in the experimental cavity is below 20 MPa. It should be noted that the usage method of the rapid heating device for high-temperature triaxial in this second embodiment is used for the rapid heating device for high-temperature triaxial in the first embodiment. Therefore, the performance principle of the rapid heating device for high-temperature triaxial will not be elaborated here. For the unelaborated parts, refer to the first embodiment.

[0053] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention through logical analysis, reasoning, or limited experiments based on the concept of the present invention on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A rapid heating device for high-temperature triaxial, characterized in that, The rapid heating device for the high-temperature triaxial includes: A high-temperature and high-pressure experimental chamber (1), where the high-temperature and high-pressure experimental chamber (1) includes an experimental chamber body (11). An experimental cavity (12) is provided inside the experimental chamber body (11). A first channel (13) and a second channel (14) are provided at the bottom of the experimental chamber body (11), and a third channel (15) is provided at the top of the experimental chamber body (11). The first channel (13) and the second channel (14) are respectively connected to the bottom of the experimental cavity (12), and the third channel (15) is connected to the top of the experimental cavity (12); An experimental chamber joint (2), where the experimental chamber joint (2) includes an oil delivery component (21) and an oil return component (22). The oil delivery component (21) is connected to the first channel (13). The oil return component (22) includes an oil return inlet (221) and a circulating hot oil outlet (222), and the oil return inlet (221) is connected to the third channel (15); A heating jacket (3), which is sleeved around the high-temperature and high-pressure experimental chamber (1), and the heating jacket (3) is detachably connected to the high-temperature and high-pressure experimental chamber (1); A heat-insulating jacket (4), which is sleeved around the heating jacket (3), and the heat-insulating jacket (4) is detachably connected to the heating jacket (3); A hot oil circulation system, where the output end of the hot oil circulation system is connected to the oil delivery component (21), and the input end of the hot oil circulation system is connected to the circulating hot oil outlet (222); A pressure application system, where the output end of the pressure application system is connected to the oil delivery component (21).

2. The rapid heating device for high-temperature triaxial as claimed in claim 1, wherein The oil delivery component (21) includes: An oil delivery outlet (211), which is connected to the first channel (13); A circulating hot oil inlet (212), which is connected to the output end of the hot oil circulation system; A confining pressure loading port (213), which is connected to the output end of the pressure application system; Wherein, the oil delivery outlet (211) is respectively communicated with the circulating hot oil inlet (212) and the confining pressure loading port (213).

3. The rapid heating device for high-temperature triaxial as described in claim 2, characterized in that, The hot oil circulation system includes: A high-temperature oil tank (501); A heating rod, which is arranged inside the high-temperature oil tank (501); A first liquid level sensor (502), which is arranged in the high-temperature oil tank (501); A first temperature sensor (503), which is arranged in the high-temperature oil tank (501); A heating circulation pipeline (504), where a first valve (505) is arranged on the heating circulation pipeline (504). One end of the heating circulation pipeline (504) is connected to the high-temperature oil tank (501), and a first pressure gauge (506) is arranged on the side of the first valve (505) away from the high-temperature oil tank (501); A pressure relief safety pipeline (507), a check valve (508) is arranged on the pressure relief safety pipeline (507), one end of the pressure relief safety pipeline (507) corresponding to the output end of the check valve (508) is connected to the high-temperature oil tank (501), and one end of the pressure relief safety pipeline (507) corresponding to the input end of the check valve (508) is connected to the other end of the heating circulation pipeline (504).

4. The rapid heating device for high-temperature triaxial as described in claim 3, characterized in that, The hot oil circulation system further includes a high-temperature oil filling pipeline (509), and the high-temperature oil filling pipeline (509) includes: A first oil filling pipeline (5091), a high-temperature pump (5092) is arranged on the first oil filling pipeline (5091); one end of the first oil filling pipeline (5091) is connected to the high-temperature oil tank (501); A second oil filling pipeline (5093), one end of the second oil filling pipeline (5093) is connected to the other end of the first oil filling pipeline (5091); the connection end of the second oil filling pipeline (5093) and the first oil filling pipeline (5091) is connected to the connection end of the heating circulation pipeline (504) and the pressure relief safety pipeline (507), the other end of the second oil filling pipeline (5093) is connected to the circulating hot oil inlet (212), and a second valve (5094) is arranged at the other end of the second oil filling pipeline (5093).

5. The rapid heating device for high-temperature triaxial as described in claim 4, characterized in that, The hot oil circulation system further includes a high-temperature oil return pipeline (510), and the high-temperature oil return pipeline (510) includes: A first high-temperature oil return pipeline (5101), one end of the first high-temperature oil return pipeline (5101) is connected to the circulating hot oil outlet (222), and a third valve (5102) is arranged at one end of the first high-temperature oil return pipeline (5101), A second high-temperature oil return pipeline (5103), one end of the second high-temperature oil return pipeline (5103) is connected to the other end of the first high-temperature oil return pipeline (5101), and the other end of the second high-temperature oil return pipeline (5103) is connected to the high-temperature oil tank (501); a fourth valve (5104) is arranged at one end of the second high-temperature oil return pipeline (5103), and a liquid filling and exhaust connection joint (5105) is arranged on the side of the fourth valve (5104) close to the first oil return pipeline (5101).

6. The rapid heating device with high temperature triaxial as described in claim 5, characterized in that: The hot oil circulation system further includes an oil discharge assembly (511), and the output end of the oil discharge assembly (511) is connected to the connection end of the first high-temperature oil return pipeline (5101) and the second high-temperature oil return pipeline (5103).

7. The rapid heating device for high-temperature triaxial as claimed in claim 6, characterized in that, The oil discharge assembly (511) includes: An air compressor (5111); An air compressor valve (5112), the input end of the air compressor valve (5112) is connected to the air compressor (5111) through an air pipeline, and a second pressure gauge (5113) is arranged on the air pipeline; The air pressure pipeline (5114), one end of the air pressure pipeline (5114) is connected to the output end of the air compressor valve (5112), and the other end of the air pressure pipeline (5114) is connected to the connection end of the first high-temperature oil return pipeline (5101) and the second high-temperature oil return pipeline (5103); a fifth valve (5115) and a liquid discharge joint (5116) are arranged on the air pressure pipeline (5114), and the liquid discharge joint (5116) is located on the side of the fifth valve (5115) away from the air compressor valve (5112).

8. The rapid heating device for a high-temperature triaxial as described in claim 7, characterized in that, The pressure application system includes: A normal temperature oil tank (601), the bottom of the normal temperature oil tank (601) is connected to the high-temperature oil tank connection (501) through an oil tank connection pipe, and a sixth valve (602) is arranged on the oil tank connection pipe; A second liquid level sensor (603), the second liquid level sensor (603) is arranged in the normal temperature oil tank (601); A second temperature sensor (604), the second temperature sensor (604) is arranged in the normal temperature oil tank (601); A pressure application pipeline (605), one end of the pressure application pipeline (603) is connected to the normal temperature oil tank (601), and the other end of the pressure application pipeline (605) is connected to the confining pressure loading port (213); a confining pressure pump (606), a seventh valve (607), an eighth valve (608) and a pressure sensor (609) are arranged on the pressure application pipeline (605), the seventh valve (607) is located on the side of the confining pressure pump (606) close to the normal temperature oil tank (601), the eighth valve (608) is located on the side of the confining pressure pump (606) away from the normal temperature oil tank (601), and the pressure sensor (609) is located between the eighth valve (608) and the confining pressure loading port (213).

9. A rapid heating device for a high-temperature triaxial, as described in claim 8, characterized in that: The high-temperature and high-pressure experimental chamber (1) further includes a thermocouple (16), the thermocouple (16) is located in the experimental cavity (12), and the connecting wire of the thermocouple (16) passes through the second channel (14) and is connected to the corresponding data receiver; the connecting wire is hermetically connected to the second channel (14).

10. A method for using a rapid heating device for high-temperature triaxial testing, the method being used for the use of a rapid heating device for high-temperature triaxial testing according to any one of claims 1 to 9, characterized in that, The usage method includes: After placing the specimen in the experimental cavity, close the second valve, open the first valve and the high-temperature pump, and at the same time set the maximum temperature of the hot oil in the high-temperature oil tank. The maximum temperature of the hot oil in the high-temperature oil tank is higher than the experimental target temperature. Heat the oil in the high-temperature oil tank with a heating rod to reach the set maximum temperature; then close the first valve and the fifth valve, open the second valve, the third valve, and the fourth valve to make the hot oil circulate between the experimental cavity and the high-temperature oil tank; then turn on the heating jacket to raise the temperature of the heating jacket to the experimental target temperature; observe the internal temperature of the experimental cavity through a thermocouple. When the internal temperature of the experimental cavity reaches the experimental target temperature, close the second valve, the third valve, and the high-temperature pump, open the seventh valve, the confining pressure pump, and the eighth valve to apply confining pressure to the specimen by injecting normal-temperature oil into the experimental cavity, observe the pressure displayed by the pressure sensor. When it is monitored that the pressure reaches the target pressure, close the eighth valve and the confining pressure pump in sequence and conduct a triaxial test; when the triaxial test is over, close the fourth valve, and then open the fifth valve, the air compressor valve, the air compressor, the third valve, and the first valve to blow the hot oil inside the experimental cavity back into the high-temperature oil tank; Or, After placing the specimen in the experimental cavity, set the maximum temperature of the hot oil in the high-temperature oil tank and the maximum temperature of the heating jacket. The maximum temperature of the hot oil in the high-temperature oil tank is higher than the experimental target temperature, and the maximum temperature of the heating jacket is the experimental target temperature; then close the first valve and the fifth valve, open the second valve, the third valve, the fourth valve, the high-temperature pump, and the heating jacket; observe the internal temperature of the experimental cavity through a thermocouple. When the internal temperature of the experimental cavity reaches the experimental target temperature, close the second valve, the third valve, and the high-temperature pump, open the seventh valve, the confining pressure pump, and the eighth valve to apply confining pressure to the specimen by injecting normal-temperature oil into the experimental cavity, observe the pressure displayed by the pressure sensor. When it is monitored that the pressure reaches the target pressure, close the eighth valve and the confining pressure pump in sequence and conduct a triaxial test; when the triaxial test is over, close the fourth valve, and then open the fifth valve, the air compressor valve, the air compressor, the third valve, and the first valve to blow the hot oil inside the experimental cavity back into the high-temperature oil tank.

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