Force and heat flow coupling simulation test device of pipeline layout type compressed air energy storage structure

Abstract

The invention relates to the technical field of testing, and particularly discloses a force and heat flow coupling simulation test device of a pipeline layout type compressed air energy storage structure, which comprises a cylinder body, a left end sealing base, a right end sealing base, a rock sample limiter, a confining pressure sleeve, a left end sealing piston, a right end sealing piston, a gas storage pipe, a heat exchanger, a loading mechanism and the like. According to the test device disclosed by the invention, high-precision model construction of a multi-physical field synergistic effect can be realized, so that force-heat-flow coupling of a pipeline layout type compressed air energy storage structure in a whole energy storage period is simulated; and multi-information real-time acquisition can be carried out on parameters such as stress field distribution, displacement deformation, temperature gradient and air pressure fluctuation of the overall structure and the surrounding stratum environment based on controllable boundary conditions and a material constitutive relationship, so that the gas storage capacity of the designed abandoned mine pipeline layout type compressed air energy storage structure in a force heat flow coupling state is evaluated. And scientific guidance is provided for the design of the compressed air energy storage structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of testing, in particular to a force-heat-flow coupling simulation test device for a pipeline layout type compressed air energy storage structure. BACKGROUND

[0002] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the general background of the application and does not necessarily constitute an admission by the patent applicant(s) that this information constitutes prior art nor that this information is entirely accurate.

[0003] A major problem in the use of new energy is the difficulty in achieving stable supply, i.e., there is an intermittent characteristic, resulting in a large amount of energy waste. Compressed air energy storage, as a new type of energy storage system that can peak shaving and energy storage, effectively alleviates the intermittent characteristics of renewable energy generation, enhances the stability of energy supply conversion to the power grid, and with its low-carbon, environmentally friendly, clean and efficient operation mechanism, it has received widespread attention from the whole society and has become an important research direction in the field of energy storage.

[0004] The compressed air energy storage of abandoned mines is to store gas after compression in abandoned mines with certain gas storage conditions. Compared with traditional compressed air energy storage methods, the compressed air energy storage of abandoned mines does not need large-scale civil engineering, reducing the construction period and construction difficulty. Moreover, there are a large number of abandoned mines to be developed in China, which can make full use of the internal storage space of goaf and roadway to make the storage capacity larger.

[0005] Currently, the main problems faced by the transformation of abandoned mine roadway mainly revolve around the stability of energy storage structure (CN117589493A), gas tightness (CN118347912A), long-term durability of operation (CN117705603A, CN115468855A), etc., mainly embodied in: (1) Due to the influence of the early excavation of the mine, the damage zone of the roadway is obvious, and under the cyclic load of the internal high-pressure gas of the compressed air energy storage cave, the surrounding rock of the cave faces the problem of instability and damage. (2) The sealing of the traditional compressed air storage cave including abandoned mines mainly relies on the sealing of the sealing layer and the sealing plug of the concrete and the surrounding structure. The failure mechanism of the above-mentioned positions of the cave sealing is not clear, and under the periodic temperature and pressure effect of the internal high-pressure gas, the long-term operation stability cannot be effectively guaranteed, and the cave faces the problem of gas leakage caused by sealing failure.

[0006] Using the method of pipeline layout in abandoned mines to carry out compressed air energy storage construction can to a great extent avoid the structural failure caused by the above-mentioned problems and ensure the efficient operation of the energy storage structure, but at present there is still a lack of an effective test device to carry out the research on the effectiveness of the pipeline layout type compressed air energy storage technology. SUMMARY

[0007] In view of the above problems, the present application provides a force-heat-flow coupling simulation test device for a pipeline layout type compressed air energy storage structure, which provides a research basis and convenience for verifying the simulation test of the compressed air energy storage technology by laying pipelines in abandoned mines. Specifically, the technical scheme of the present application is as follows.

[0008] A force-heat-flow coupling simulation test device for a pipeline layout type compressed air energy storage structure, comprising a cylinder, a left end sealing base, a right end sealing base, a rock sample limiter, a confining pressure sleeve, a left end sealing piston, a right end sealing piston, a gas storage pipe, a heat exchanger and a loading mechanism. Wherein: the cylinder is horizontally arranged and has a cylindrical inner cavity, the left end sealing base and the right end sealing base are respectively covered on the left and right ports of the cylinder and are detachably connected. The rock sample limiter is a T-shaped cylinder, which is arranged adjacent to the left end sealing base and located on the right side. The thinner end of the rock sample limiter passes through the left end sealing base, and the gap is formed between the outer wall of the thicker end of the rock sample limiter and the inner wall of the cylinder. The flexible confining pressure sleeve is located in the inner cavity of the cylinder, and the two ends of the confining pressure sleeve are tightly sleeved on the outer wall of the thicker end of the rock sample limiter and the outer wall of the right end sealing base, respectively, and a confining pressure chamber is formed between the confining pressure sleeve and the cylinder for inflating to form confining pressure. The left end sealing piston and the right end sealing piston are respectively sealed and limited in the mounting holes of the rock sample limiter and the right end sealing base. The gas storage pipe is located in the confining pressure sleeve, and the two ends of the gas storage pipe are respectively sealed on the end step of the left end sealing piston and the right end sealing piston, and the space between the gas storage pipe and the confining pressure sleeve forms a sample installation chamber. The right end sealing piston has a gas filling pipe communicating with the inner cavity of the gas storage pipe. The heat exchanger is located in the gas storage pipe, and the loading mechanism is installed on the outer wall of the right end sealing base for applying load to the filling material in the sample installation chamber.

[0009] Further, an adjusting rod is threadedly connected to the left end sealing base, one end of the adjusting rod abuts against the side wall of the thicker end of the rock sample limiter after passing through the left end sealing base. The other end of the adjusting rod is located outside the left end sealing base. Preferably, an unlocking gap is reserved between the left side wall of the thicker end of the left end sealing piston and the rock sample limiter.

[0010] Further, the loading mechanism comprises a counterforce frame, a screw rod, a force transmission disc, a force transmission rod and a constraint loading end. The counterforce frame is fixed on the outer sidewall of the right end sealing base. One end of the screw rod penetrates the counterforce frame and is fixedly connected with the force transmission disc, and the screw rod is threadedly connected with the counterforce frame. One end of the force transmission rod is connected with the force transmission disc, and the other end penetrates the right end sealing base and is connected with the constraint loading end. The constraint loading end is an annular body, which is sleeved on the gas storage pipe and is in sliding sealing connection with the gas storage pipe. Preferably, the right end of the constraint loading end is located in the mounting hole of the left end surface of the right end sealing base, so that the space of the sample mounting chamber is larger.

[0011] Further, the mounting hole of the right end sealing base is a horizontally arranged T-shaped hole, and the thinner end of the T-shaped hole is located on the outer side. The right end sealing piston is located in the T-shaped hole, and the right end sealing piston is a T-shaped cylinder body corresponding to the T-shaped hole. The constraint loading end is sleeved on the outer sidewall of the gas storage pipe and the right end sealing piston. Preferably, the constraint loading end, the right end sealing piston and the sidewall of the T-shaped hole are all provided with sealing rings arranged in sealing grooves.

[0012] Further, a taper sleeve is further arranged, which is a T-shaped sleeve, and the outer sidewall of the thinner end of the sleeve is a tapered surface. The taper sleeve is sleeved on the rock sample limiter and is arranged close to the inner wall surface of the left end sealing base. The outer sidewall of the taper sleeve is in sealing connection with the inner sidewall of the cylinder body. Preferably, the taper sleeve and the inner sidewall of the cylinder body are provided with sealing rings arranged in sealing grooves.

[0013] Further, both ends of the confining pressure sleeve are outwardly flared tapered openings, which are sleeved on the tapered surface of the taper sleeve and tightly fit with the tapered surface.

[0014] Further, the mounting hole of the rock sample limiter is a T-shaped hole, and the thinner end of the T-shaped hole is located on the outer side. The left end sealing piston is a T-shaped cylinder body corresponding to the T-shaped hole. Preferably, the left end sealing piston and the T-shaped hole are provided with sealing rings arranged in sealing grooves.

[0015] Further, the thinner end of the left end sealing piston and the thinner end of the right end sealing piston are threadedly connected with the respective T-shaped holes.

[0016] Further, the cylinder body has a confining pressure inflation opening and a confining pressure monitoring element mounting opening on the outer wall.

[0017] Further, the rock sample limiter is provided with a first information acquisition channel, one end of which is in communication with the sample mounting chamber, and the other end is in communication with the outside. The left end sealing piston is provided with a second information acquisition channel at the center, one end of which is in communication with the gas storage pipe, and the other end is in communication with the outside.

[0018] Further, the heat exchanger forms a circulating pipeline with the external heat exchange medium tank through the medium channel on the right end sealing piston, and a driving pump body and a temperature detection instrument are arranged on the pipeline to drive the heat exchange medium in the heat exchanger to circulate and flow, and test the temperature of the discharged heat exchange medium. Optionally, the heat exchanger is a spiral pipe.

[0019] Further, the test sample mounting chamber is provided with a cylindrical surrounding rock sample in the test, and the outer side wall of the surrounding rock sample is attached to the confining pressure sleeve. The space between the surrounding rock sample and the gas storage pipe is filled with filling material.

[0020] Further, the end step of the left end sealing piston is a conical head, and the conical head forms a cylindrical end step after being sleeved with an annular sealing sleeve. The left end port of the gas storage pipe is sleeved on the cylindrical end step, the inner side wall of the gas storage pipe is in close contact with the annular sealing sleeve, and the end of the gas storage pipe abuts against the step face of the end step. The right end sealing piston has the same structure as the left end sealing piston, and the connection mode of the right end sealing piston and the right end port of the gas storage pipe is the same as the connection mode of the left end sealing piston and the left end port of the gas storage pipe.

[0021] Compared with the prior art, the test device of the present application has at least the following beneficial technical effects: the test device of the present application can realize high-precision model construction of multiple physical field cooperation, thereby simulating the force-heat-flow coupling of the pipeline layout type compressed air energy storage structure in the entire energy storage period, and can collect multiple information of stress field distribution, displacement deformation, temperature gradient, gas pressure fluctuation and other parameters of the overall structure and surrounding stratum environment in real time based on controllable boundary conditions and material constitutive relation, thereby evaluating the gas storage capacity of the designed abandoned mine pipeline layout type compressed air energy storage structure under the force-heat-flow coupling state, and providing scientific guidance for the design of the compressed air energy storage structure. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application and the explanation thereof, explain the present application, and do not constitute an improper limitation of the present application.

[0023] Figure 1 The following is a perspective view of the simulation test device in the following examples.

[0024] Figure 2 The following is a sectional view of the simulation test device in the following examples.

[0025] Figure 3 The following is a structural schematic view of the left end sealing piston in the following examples.

[0026] Figure 4 The following is a structural schematic view of the taper sleeve in the following examples.

[0027] Figure 5 is a sectional view of another simulation test device used in the following examples.

[0028] Figure 6 is a structural schematic view of another left end sealing piston used in the following examples.

[0029] Figure 7 is a structural schematic view of an annular sealing sleeve used in the following examples.

[0030] The marks in the above figures respectively represent: 1-cylinder, 2-left end sealing base, 3-right end sealing base, 4-rock sample limiter, 5-confining pressure sleeve, 6-left end sealing piston, 7-right end sealing piston, 8-gas storage pipe, 9-heat exchanger, 10-counterforce frame, 11-screw rod, 12-force transmission disc, 13-force transmission rod, 14-restraint loading end head, 15-sealing ring, 16-tapered sleeve, 201-adjusting rod, 401-unlocking gap, 402-first information acquisition channel, 501-confining pressure chamber, 502-confining pressure inflation port, 503-confining pressure monitoring element installation port, 504-tapered port, 505-surrounding rock sample, 601-end step, 602-second information acquisition channel, 603-annular sealing sleeve, 701-inflation pipeline, 702-medium channel. DETAILED DESCRIPTION

[0031] It should be noted that the following detailed description is illustrative only, and is intended to provide further description in connection with the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0032] It is also important to note that the terms "including", "comprising", and / or "having" as used herein are specifically intended to be open-ended and also to mean including, comprising, and / or having other components, in addition to the list of components specifically recited previously.

[0033] For the convenience of description, if "upper", "lower", "left" and "right" are mentioned in the present application, they only mean the same direction as the upper, lower, left and right of the drawing itself, and do not limit the structure, but only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to needs to have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0034] The force-heat flow coupling simulation test device of the pipeline layout type compressed air energy storage structure will be further described in combination with the drawings and specific embodiments of the present application.

[0035] Referring to Figure 1 , Figure 2 and Figure 3 , an example of a force-heat flow coupling simulation test device of a pipeline layout type compressed air energy storage structure includes a cylinder body 1, a left end sealing base 2, a right end sealing base 3, a rock sample limiter 4, a confining pressure sleeve 5, a left end sealing piston 6, a right end sealing piston 7, a gas storage pipe 8, a heat exchanger 9 and a loading mechanism. Specifically, the cylinder body 1 is a cylinder body with open ends, which is horizontally arranged and has a cylindrical inner cavity. The left end sealing base 2 covers the left end port of the cylinder body 1, and the two are detachably connected by bolts. The right end sealing base 3 is a T-shaped cylinder, the thinner end of which is located in the right end port of the cylinder body 1 and has a gap therebetween, and the thicker end of the right end sealing base 3 covers the right end port of the cylinder body 1, and the two are detachably connected by bolts.

[0036] The rock sample limiter 4 is a T-shaped cylinder formed integrally by a thicker end and a thinner end, and the thicker end is arranged adjacent to the right side of the left end sealing base 2. The thinner end is flush with the outer sidewall of the left end sealing base 2 after passing through the through hole on the left end sealing base 2. There is a gap between the outer sidewall of the thicker end of the rock sample limiter 4 and the inner sidewall of the cylinder body 1 to accommodate the end of the confining pressure sleeve 5.

[0037] The confining pressure sleeve 5 is a cylinder made of flexible material such as rubber, which is arranged in the inner cavity of the cylinder body 1, and the left end port of the confining pressure sleeve 5 is tightly sleeved on the outer sidewall of the thicker end of the rock sample limiter 4, and the right end port of the confining pressure sleeve 5 is tightly sleeved on the outer sidewall of the thinner end of the right end sealing base 3, and there is a space between the confining pressure sleeve 5 and the cylinder body 1, which serves as a confining pressure chamber 501 for inflating gas to form confining pressure on the sidewall of the confining pressure sleeve 5. For this purpose, the outer wall of the cylinder body 1 has a confining pressure inflation port 502 and a confining pressure monitoring element mounting port 503 which communicate with the confining pressure chamber 501. Wherein: the confining pressure inflation port 502 is connected with the external inflation device to inflate gas into the confining pressure chamber 501, forming pressure on the confining pressure sleeve 5, thereby simulating the confining pressure exerted by the rock mass on the roadway in the abandoned mine. The confining pressure monitoring element mounting port 503 is used to install pressure detection sensors and other pressure detection elements to monitor the pressure in the confining pressure chamber 501 to ensure that the confining pressure is maintained at a set value.

[0038] The left end sealing piston 6 and the right end sealing piston 7 are respectively sealed and limited in the installation holes of the rock sample limiter 4 and the right end sealing base 3. Specifically, the installation hole on the rock sample limiter 4 is a horizontally arranged T-shaped hole, and the thinner end of the T-shaped hole is located on the outside. The left end sealing piston 6 is a T-shaped cylinder corresponding to the T-shaped hole. The left end sealing piston 6 and the T-shaped hole have a sealing ring 15 arranged in a sealing groove, thereby improving the sealing between the two. Similarly, the installation hole on the right end sealing base 3 is also a horizontally arranged T-shaped hole, and the thinner end of the T-shaped hole is located on the outside. The right end sealing piston 7 is a T-shaped cylinder corresponding to the T-shaped hole. The right end sealing piston 7 and the T-shaped hole have a sealing ring 15 arranged in a sealing groove, thereby improving the sealing between the two, preventing air leakage from affecting the accuracy of the test results. The thinner end of the left end sealing piston 6 and the thinner end of the right end sealing piston 7 are threadedly connected with the respective T-shaped holes.

[0039] The gas storage pipe 8 is a rigid straight pipe (such as a steel pipe, a copper pipe, etc.), which is arranged in the confining pressure sleeve 5. The two ends of the gas storage pipe 8 are respectively sealed and sleeved on the end step 601 of the left end sealing piston 6 and the right end sealing piston 7, and the end face of the gas storage pipe 8 abuts against the step face of the end step 601. The space between the gas storage pipe 8 and the confining pressure sleeve 5 forms a sample installation chamber for installing the surrounding rock sample 505 and the granular filling material. The right end sealing piston 7 has a gas charging pipeline 701 communicating with the inner cavity of the gas storage pipe 8, so as to charge compressed gas therein to build a compressed air energy storage working condition. The right end sealing base 3 and the rock sample limiter 4 can seal the two ends of the surrounding rock sample 505, thereby enhancing the durability of the confining pressure sleeve 5 at the interface between the rock sample limiter 4 and the surrounding rock sample 505, avoiding the problem that the confining pressure sleeve 5 is easily broken at the gap position due to the shear force borne by the confining pressure sleeve 5 at the gap position caused by the too large interface gap.

[0040] The heat exchanger 9 is a spiral pipeline arranged in the gas storage pipe 8, and the two ends of the heat exchanger 9 are respectively communicated with two medium channels 702 on the right end sealing piston 7. The medium channel 702 forms a circulating pipeline with an external heat exchange medium tank, and a driving pump body and a temperature detection instrument are arranged on the pipeline to drive the heat exchange medium (such as water, etc.) in the heat exchanger 9 to circulate, and at the same time, the temperature of the discharged heat exchange medium is tested, so as to obtain the change of the heat of the compressed air in the gas storage pipe 8.

[0041] The loading mechanism comprises a counter-force frame 10, a screw rod 11, a force transmission disc 12, a force transmission rod 13 and a constraint loading end head 14. The counter-force frame 10 is in a U-shaped structure, and both ends thereof are fixed on the outer side wall of the right end sealing base 3 by bolts or other fasteners. One end of the screw rod 11 is fixedly connected with the force transmission disc 12 in the counter-force frame 10, and the screw rod 11 is threadedly connected with the counter-force frame 10. One end of the force transmission rod 13 is connected with the force transmission disc 12, and the other end thereof is movably inserted through the right end sealing base 3 and connected with the constraint loading end head 14. The constraint loading end head 14 is in an annular body, and is slidably sleeved on the gas storage tube 8 and has a sealing ring 15 arranged in a groove therebetween to prevent the gas storage tube 8 from leaking and to achieve the sliding sealing connection therebetween. A plurality of force transmission rods 13 are uniformly distributed along the circumference of the constraint loading end head 14, so as to more uniformly apply pressure to the filling material. The constraint loading end head 14 sleeved on the gas storage tube 8 can play a constraint protection role on the right end of the gas storage tube 8, so as to ensure the balance of the left and right ends of the gas storage tube 8 and avoid the expansion of the end of the gas storage tube 8 under the action of high gas pressure in the gas storage tube 8, thereby preventing the leakage problem. This is because the left end of the gas storage tube 8 is located in the rock sample limiter 4, so that the expansion deformation of the left end of the gas storage tube 8 due to the internal gas pressure can be prevented under the rigid constraint of the rock sample limiter 4. If the right end of the gas storage tube 8 is not subjected to the action of the constraint loading end head 14, the right end will become a weak bearing end, which is more likely to become a breakthrough of the internal pressure of the gas storage tube 8, causing the right end to expand and leak, and reducing the accuracy of the test results.

[0042] In another embodiment, referring to Figure 2 The left end sealing base 2 of the test device of the above embodiment has a through screw hole, and an adjusting rod 201 is threadedly connected with the screw hole. One end of the adjusting rod 201 abuts against the side wall of the thicker end of the rock sample limiter 4 after being inserted through the left end sealing base 2. The other end of the adjusting rod 201 is located outside the left end sealing base 2. A plurality of adjusting rods 201 are uniformly distributed along the circumference of the left end sealing base 2. By adjusting the adjusting rods 201, the right end face of the rock sample limiter 4 can be tightly abutted against the surrounding rock sample 505, so that the connection between the two is more compact, and the problem of the rupture of the confining pressure sleeve 5 at the gap position due to the shear force borne by the confining pressure sleeve 5 at the gap position is avoided.

[0043] A better embodiment based on the above is that, referring to Figure 2, the left side wall of the thick end of the left end sealing piston 6 and the rock sample limiter 4 are provided with an unlocking gap 401, that is, when the end face of the gas storage tube 8 abuts against the step face of the end step 601 of the left end sealing piston 6, the left side wall of the thick end of the left end sealing piston 6 and the rock sample limiter 4 are not in close contact but have the unlocking gap 401. Thus, before the rock sample limiter 4 abuts against the end face of the surrounding rock sample 505, the adjusting rod 201 is first rotated outwards / leftwards by a certain distance (at this time, the unlocking gap 401 is reduced or even disappears), and then the adjusting rod 201 is rotated inwards, at this time, the left end sealing piston 6 moves synchronously with the rock sample limiter 4. Through the above arrangement, the problem that the rock sample limiter 4 cannot move rightwards due to the constraint of the left end sealing piston 6 by the gas storage tube 8 when the rock sample limiter 4 needs to move rightwards is avoided. This is because the existence of the unlocking gap 401 can first adjust the left end sealing piston 6 outwards to temporarily separate / unlock the end step 601 from the end of the gas storage tube 8, thereby eliminating the constraint on the rock sample limiter 4. After the rock sample limiter 4 is adjusted, the left end sealing piston 6 can be rotated inwards / rightwards again until the end step 601 abuts against the end of the gas storage tube 8 again to realize the sealed connection.

[0044] In another embodiment, referring to Figure 2 , the test device of the above embodiment further comprises a tapered sleeve 16. Specifically, referring to Figure 4 , the tapered sleeve 16 is a T-shaped sleeve, and the outer side wall of the thin end of the sleeve is a tapered surface. There are two tapered sleeves 16, which are respectively sleeved on the rock sample limiter 4 and the right end sealing base 3. Among them, the left one of the tapered sleeves 16 is arranged adjacent to the inner wall surface of the left end sealing base 2, and the right one of the tapered sleeves 16 is arranged adjacent to the inner side wall of the thick end of the right end sealing base 3. The outer side walls of the two tapered sleeves 16 are in close contact with the inner side walls of the cylinder body 1 through the sealing ring 15 arranged in the sealing groove, so as to ensure the good sealing performance of the confining pressure chamber 501. At the same time, the two ends of the confining pressure sleeve 5 are outwardly flared tapered mouths 504, which are sleeved on the tapered surfaces of the tapered sleeves 16 and are in close contact with each other. This structure can convert the simple sleeving relationship between the confining pressure sleeve 5, the rock sample limiter 4 and the right end sealing base 3 into a more complex mechanical interlocking structure, which can make the two ends of the confining pressure sleeve 5 tightly press against the tapered surfaces of the tapered sleeves 16 under the action of the confining pressure in the confining pressure sleeve 5, so as to form a more complex and variable gas leakage channel, thereby better preventing gas leakage.

[0045] In another embodiment, referring to Figure 2The right end of the constraint loading end head 14 of the test device of the above embodiment is located in the T-shaped mounting hole of the left end face of the right end sealing base 3. At this time, the constraint loading end head 14 is sleeved on the right end sealing piston 7 and the gas storage tube 8 at the same time, and the interface joint of the two is wrapped by the constraint loading end head 14, so as to not only further prevent the gas storage tube 8 from leaking to avoid affecting the accuracy of the test result, but also to make the space of the sample mounting chamber larger, fill more filling materials, and construct a more complete and comprehensive pipeline protection zone. Further, the constraint loading end head 14, the right end sealing piston 7, and the T-shaped hole side wall all have sealing rings 15 arranged in the sealing grooves.

[0046] In another embodiment, referring to Figure 5 、 Figure 6 and Figure 7 , the end step 601 of the left end sealing piston 6 of the test device of the above embodiment is a conical head, and the conical head constitutes a cylindrical end step after being sleeved with an annular sealing sleeve 603. The left end port of the gas storage tube 8 is sleeved on the cylindrical end step, and the inner side wall of the gas storage tube 8 is in close contact with the annular sealing sleeve 603, and the end of the gas storage tube 8 abuts against the step face of the end step 601. Similarly, the right end sealing piston 7 has the same structure as the left end sealing piston 6, and the connection mode of the right end sealing piston 7 and the right end port of the gas storage tube 8 is the same as that of the left end sealing piston 6 and the left end port of the gas storage tube 8. The structure of the embodiment can utilize the pressure (as shown by the arrow in Figure 5 、 Figure 6 ) exerted by the compressed air in the gas storage tube 8 on the annular sealing sleeve 603 to promote the annular sealing sleeve 603 to slide outward along the conical face of the end step 601, which makes the annular sealing sleeve 603 deform and increase in volume under the constraint of the triangular space formed by the conical face and the inner wall of the gas storage tube 8, and further improves the sealing between the gas storage tube 8 and the left end sealing piston 6.

[0047] The test device of the above embodiment is aimed at a pipeline for storing compressed air laid in an abandoned mine, and the pipeline is filled with granular filling material. The filling material is arranged around the gas storage pipe 8 to form a pipeline protection zone to test the protection effect of the pipeline protection zone on the gas storage pipe 8 under the stress of surrounding rock. When the energy storage structure is tested by force-heat-flow coupling simulation, the cylindrical surrounding rock sample 505 is inserted into the confining pressure sleeve 5 / sample installation chamber from the left port of the cylinder body 1, and the outer wall of the surrounding rock sample 505 is tightly fitted with the confining pressure sleeve 5. After completion, the space between the inner wall of the surrounding rock sample 505 and the gas storage pipe 8 is filled with granular filling material (for example, a mixture of rigid particles such as sand, ore, steel slag and flexible particles such as rubber and plastic, or rigid particles coated with flexible material, etc.), and the surrounding rock sample 505 is obtained from the abandoned mine. After the above installation is completed, the left end sealing piston 6 is installed on the rock sample limiter 4, and then the rock sample limiter 4 and the left end sealing base 2 are sequentially installed on the left port of the cylinder body 1.

[0048] (1) The confining pressure chamber 501 is filled with gas through the confining pressure inflation port 502 to form a confining pressure on the surrounding rock sample 505 to reproduce the pressure on the surrounding rock in the roadway, realize the construction of the confining pressure state of the stratum inside the abandoned mine structure, and make the test more close to the actual engineering. The confining pressure can be obtained by detecting the site of the abandoned mine. By changing the pressure of the filled gas, the purpose of applying accurate stress boundary conditions to the surrounding rock sample 505 can be achieved. In this process, the pressure in the confining pressure chamber 501 is monitored by the pressure detection sensor installed in the confining pressure monitoring element installation port 503 to ensure that the confining pressure remains at a set value. The temperature and stress changes of the inner surface of the surrounding rock sample 505 are tested by the temperature sensor (such as a pasted K-type thermocouple) and the stress sensor (such as a pasted resistance stress sensor) arranged on the inner surface of the surrounding rock sample 505. The temperature change of the inner surface can evaluate the heat loss caused by the surrounding rock sample 505 (corresponding to the abandoned mine for laying compressed air pipeline in the actual engineering), and the temperature data can guide the heat energy recovery (such as waste heat utilization) or auxiliary heating to improve energy efficiency. The stress change can be used to evaluate the stability and durability of the pipeline, which is less likely to deform under the applied confining pressure, and the stability and durability are better.

[0049] (2) Rotate the screw rod 11, and then drive the constraint loading end head 14 to move to apply pressure to the filling material, so as to realize the purpose of applying a controllable displacement boundary condition to the filling material, and accurately simulate the complex boundary conditions and various load combinations of the pipeline layout type compressed air energy storage structure under actual working conditions. In the above test process, the first information acquisition channel 402 is arranged on the rock sample limiter 4, one end of which is in communication with the sample installation chamber, and the other end is in communication with the outside. Temperature sensors and stress sensors are arranged in the filling material along the length direction to collect the changes of temperature and stress. Among them: the collected temperature changes can be used to evaluate the heat preservation performance of the filling material to the gas storage pipe 8 and the stress adjustment effect of the filling material to the internal pipeline.

[0050] (3) Connect the inflation pipeline 701 with the external air device, open the valve, and then fill compressed air into the gas storage pipe 8. The second information acquisition channel 602 is arranged at the center of the left end sealing piston 6 and penetrates through, which is in communication with the gas storage pipe 8, and the other end is in communication with the outside. At the same time, the heat exchange medium is introduced into the heat exchanger 9 through the medium channel 702, and the temperature of the discharged heat exchange medium is tested, so as to obtain the change of the heat of the compressed air in the gas storage pipe 8. Temperature sensors can be arranged in the middle and end positions of the inner surface of the gas storage pipe 8 to measure the temperature, and temperature sensors are arranged on the outer surface of the gas storage pipe 8 to monitor the temperature change. The air pressure sensor connected with the inflation pipeline 701 is used to measure the air pressure change in the gas storage pipe 8, and the obtained temperature and air pressure change data can be used to evaluate the heat loss of the gas storage pipe 8. The strain gauge arranged on the outer wall of the gas storage pipe 8 is used to monitor the deformation of the gas storage pipe, so as to evaluate the stability performance of the gas storage pipe 8.

[0051] (4) Release the compressed air in the gas storage pipe 8 through the inflation pipeline 701, and collect the change of the air pressure in the gas storage pipe 8 under the given air release rate. Finally, according to the data and change curves collected in the above steps, the temperature and pressure change law under different working conditions under the coupling action of force, heat and flow is analyzed, so as to evaluate the capacity of the pipeline layout type compressed air energy storage structure.

[0052] Finally, it should be noted that any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application. Although the specific embodiments of the present application are described above with reference to the accompanying drawings, the present application is not limited to the scope of the above description, and those skilled in the art should understand that various modifications or changes made on the basis of the technical solutions of the present application without creative labor are still within the protection scope of the present application.

Claims

1. A force-heat flow coupling simulation test device for a pipeline-laid compressed air energy storage structure, characterized in that, The utility model relates to a kind of rock sample loading and confining device, including: Cylinder, it is horizontally arranged, and with cylindrical inner cavity; Left end sealing base, right end sealing base, it covers respectively on the left and right two ports of cylinder and can be detachably connected; Rock sample limiter, it is T-shaped cylinder, and it is arranged adjacent to left end sealing base and located right side thereof; The thinner end of rock sample limiter passes through left end sealing base, and there is gap between the outer wall of the thicker end of rock sample limiter and the inner wall of cylinder; Surrounding pressure sleeve, flexible surrounding pressure sleeve is located in the inner cavity of cylinder, and both ends of surrounding pressure sleeve are tightly sleeved on the outer wall of the thicker end of rock sample limiter, the outer wall of right end sealing base respectively, and surrounding pressure cavity is formed between surrounding pressure sleeve and cylinder; Left end sealing piston, right end sealing piston, it is sealed and limited in the installation hole of rock sample limiter, right end sealing base respectively; Gas storage pipe, it is located in surrounding pressure sleeve, and both ends of gas storage pipe are sealed and sleeved on the end step of left end sealing piston, right end sealing piston respectively;The space between gas storage pipe and surrounding pressure sleeve forms sample installation chamber;Right end sealing piston has gas filling pipeline that communicates with the inner cavity of gas storage pipe;Gas storage pipe is provided with heat exchanger; Loading mechanism, it is installed on the outer wall of right end sealing base, for filling material in sample installation chamber is applied load.

2. The force-heat flow coupling simulation test device of the pipeline-laid compressed energy storage structure according to claim 1, characterized in that, The adjusting rod is threadedly connected to the left end sealing base, one end of the adjusting rod abuts against the side wall of the thicker end of the rock sample limiter after passing through the left end sealing base, and the other end of the adjusting rod is located outside the left end sealing base. Alternatively, an unlocking gap is reserved between the left side wall of the thicker end of the left end sealing piston and the rock sample limiter.

3. The force-heat flow coupling simulation test device of the pipeline-laid compressed air energy storage structure according to claim 1, characterized in that, The loading mechanism includes a counterforce frame, a screw rod, a force transmission disc, a force transmission rod, and a constraint loading end head. The counterforce frame is fixed to the outer side wall of the right end sealing base. One end of the screw rod passes through the counterforce frame and is fixedly connected to the force transmission disc. The screw rod is threadedly connected to the counterforce frame. One end of the force transmission rod is connected to the force transmission disc, and the other end of the force transmission rod passes through the right end sealing base and is connected to the constraint loading end head. The constraint loading end head is an annular body that is sleeved on the gas storage pipe and is in sliding sealing connection with the gas storage pipe. Alternatively, the right end of the constraint loading end head is located in the installation hole of the left end face of the right end sealing base.

4. The force-heat flow coupling simulation test device of the pipeline-laid pressure energy storage structure according to claim 3, characterized in that, The installation hole is a horizontally arranged T-shaped hole, and the thinner end of the T-shaped hole is located on the outer side. The right end sealing piston is located in the T-shaped hole, and the right end sealing piston is a T-shaped cylinder corresponding to the T-shaped hole. The constraint loading end head is sleeved on the outer side wall of the gas storage pipe and the right end sealing piston. Alternatively, the constraint loading end head, the right end sealing piston, and the side wall of the T-shaped hole each have a sealing ring arranged in a sealing groove.

5. The force-heat flow coupling simulation test device of the pipeline-laid pressure energy storage structure according to claim 1, characterized in that, The utility model further includes a tapered sleeve that is a T-shaped sleeve. The outer side wall of the thinner end of the sleeve is a tapered surface. The tapered sleeve is sleeved on the rock sample limiter and is arranged adjacent to the inner wall of the left end sealing base. The outer side wall of the tapered sleeve is in sealing connection with the inner wall of the cylinder. Alternatively, the tapered sleeve and the inner wall of the cylinder have a sealing ring arranged in a sealing groove. Or, the two ends of the confining pressure sleeve are outwardly flared conical openings, which are sleeved on the conical surface of the tapered sleeve and tightly fit with each other.

6. The force-heat flow coupling simulation test device of the pipeline-laid pressure energy storage structure according to claim 1, characterized in that, The mounting hole of the rock sample positioner is a T-shaped hole, and the thinner end of the T-shaped hole is located on the outside; the left end sealing piston is a T-shaped cylinder corresponding to the T-shaped hole; or, the left end sealing piston and the T-shaped hole have a sealing ring arranged in a sealing groove.

7. The force-heat flow coupling simulation test device of the pipeline-laid pressure energy storage structure according to claim 1, characterized in that, The thinner end of the left end sealing piston, the thinner end of the right end sealing piston and the respective T-shaped holes are threadedly connected. 8.The force-heat flow coupling simulation test device of a pipeline-laid pressure energy storage structure according to claim 1, wherein, The cylinder body outer wall has a confining pressure inflation opening and a confining pressure monitoring element mounting opening; Or, the rock sample positioner is provided with a first information acquisition channel, one end of which communicates with the sample mounting chamber, and the other end of which communicates with the outside; Or, the left end sealing piston is provided with a second information acquisition channel at the center thereof, one end of which communicates with the gas storage pipe, and the other end of which communicates with the outside. 9.The force-heat flow coupling simulation test device of a pipeline-laid pressure energy storage structure according to claim 1, wherein, The heat exchanger forms a circulating pipeline with the heat exchange medium tank outside through the medium channel on the right end sealing piston, and a driving pump body and a temperature detection instrument are arranged on the pipeline to drive the heat exchange medium in the heat exchanger to circulate and flow, and to test the temperature of the discharged heat exchange medium; or, the heat exchanger is a spiral pipe.

10. The force-heat flow coupling simulation test device of the pipeline-laid pressure energy storage structure according to any one of claims 1-9, characterized in that, The end step of the left end sealing piston is a conical head, and the conical head constitutes a cylindrical end step after being sleeved with an annular sealing sleeve; the left port of the gas storage pipe is sleeved on the cylindrical end step, and the inner side wall of the gas storage pipe tightly contacts with the annular sealing sleeve, and the end of the gas storage pipe abuts against the step surface of the end step; the right end sealing piston has the same structure as the left end sealing piston, and the connection mode of the right end sealing piston and the right port of the gas storage pipe is the same as the connection mode of the left end sealing piston and the left port of the gas storage pipe.

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