CN114184533A - Fractured rock mass seepage heat transfer device and system - Google Patents
Fractured rock mass seepage heat transfer device and system Download PDFInfo
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- 238000012546 transfer Methods 0.000 title claims abstract description 50
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- 230000007246 mechanism Effects 0.000 claims abstract description 85
- 238000007789 sealing Methods 0.000 claims abstract description 64
- 238000003825 pressing Methods 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 6
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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Abstract
The application relates to a fractured rock mass seepage heat transfer device and a system, the fractured rock mass seepage heat transfer device comprises a supporting mechanism, a first water sealing mechanism, a second water sealing mechanism, a water inlet mechanism, a water outlet mechanism and a heating mechanism, wherein the first water sealing mechanism comprises a top plate and a movable plate which are oppositely arranged along a first direction and a first driving assembly for driving the movable plate to move along the first direction, the second water sealing mechanism comprises two pressing plates which are oppositely arranged along a second direction and a second driving assembly for driving the two pressing plates to move in an opposite direction or in a separated direction, and the water inlet mechanism comprises a water inlet groove formed in a first sealing baffle plate and a water inlet pipe communicated with the water inlet groove; the water outlet mechanism comprises a second sealing baffle, a water outlet groove arranged on the first sealing baffle and a water outlet pipe communicated with the water outlet groove. This experimental apparatus improves and seals water effect, effectively avoids the problem of leaking in the experimentation to obtain accurate import and export temperature and flow data, improve the experiment precision.
Description
Technical Field
The application relates to the technical field of seepage heat transfer experiments, in particular to a seepage heat transfer device and system for fractured rocks.
Background
Under the era background of 'carbon neutralization and carbon peak reaching', deep geothermal energy is taken as renewable clean energy and is regarded as one of main alternative energy sources of coal due to high calorific value, abundant reserves, wide distribution range and huge exploitation potential. The exploitation of the hot dry rock needs to establish an artificial fracture zone in a thermal reservoir, then cold water is injected into the fracture zone, heat exchange between fluid and a high-temperature rock body is realized through flowing, the heat is brought to the ground through a production well, and finally, heat energy is converted into electric energy. Therefore, the development of the research on the convective heat transfer process of water and rock matrix in the fractured rock mass has important significance for realizing the high-efficiency exploitation of the hot dry rock.
Because the in-situ environmental conditions of the engineering rock are quite complex, it is very difficult to reveal the water-heat migration rule of the fractured rock on the engineering scale. Therefore, the experimental study in the indoor of the fractured rock mass water heat migration has irreplaceable effect on revealing the seepage and heat transfer rule of the rock mass fracture, mastering the mechanism of the fractured rock mass water heat migration under the fluid-solid coupling effect and knowing the seepage and heat transfer influence factors of the fractured rock mass under the high-temperature and high-pressure effect. On the basis, scholars at home and abroad have developed a large number of experimental devices for the hydrothermal migration of fractured rocks. In order to reduce the hydrothermal migration condition in deep rock mass cracks, the experimental conditions of high pressure, high temperature and high water pressure need to be provided during the experiment, the existing experimental device is mostly realized by modifying a triaxial testing machine pressure chamber, and most of the adopted rock samples are cylindrical. In this case, in order to provide uniform and constant temperature and axial pressure to the sample, the rock sample needs to be entirely in a fully closed state in the whole experiment process. The existing experimental device has the following problems: the water sealing property is poor, the water leakage problem generally exists in the experimental process, the water temperature and the flow measurement of an inlet and an outlet are not accurate enough, and the experimental precision is influenced.
Disclosure of Invention
An object of this application is to provide a fissured rock mass seepage heat transfer device and system, this fissured rock mass seepage heat transfer device and system improve and seal the water effect, effectively avoid the problem of leaking in the experimentation to obtain accurate import and export temperature and flow data, improve the experiment precision.
To this end, in a first aspect, the present application provides a fractured rock mass seepage heat transfer device, including: the supporting mechanism is provided with a placing groove for placing the fractured rock sample; the first water sealing mechanism comprises a top plate and a movable plate which are oppositely arranged along a first direction, and a first driving assembly for driving the movable plate to move along the first direction, wherein the top plate and the movable plate are respectively positioned on two sides of the fractured rock sample along the first direction; the second water sealing mechanism comprises two pressure plates which are oppositely arranged along a second direction and a second driving assembly which drives the two pressure plates to move in the opposite direction or in the opposite direction, and the two pressure plates are respectively positioned on two sides of the fractured rock sample along the second direction; the water inlet mechanism is arranged on one side of the movable plate, which faces the fractured rock sample, and comprises a water inlet groove and a water inlet pipe, wherein the first sealing baffle is arranged on the first sealing baffle; the water outlet mechanism is arranged on one side, facing the fractured rock sample, of the top plate and comprises a second sealing baffle plate, a water outlet groove arranged on the first sealing baffle plate and a water outlet pipe communicated with the water outlet groove; the heating mechanism comprises two heat sources which are oppositely arranged along a third direction, and the two heat sources are respectively positioned on two sides of the fractured rock sample along the third direction; the first direction and the second direction are arranged in an intersecting mode, the second direction and the third direction are arranged in an intersecting mode, and the first direction and the third direction are arranged in an intersecting mode.
In a possible implementation manner, the first sealing baffle includes a first plate body disposed opposite to the second sealing baffle, and two second plate bodies connected to two ends of the first plate body, respectively, one of the second plate bodies is located between one of the pressure plates and the fractured rock sample, and the other one of the second plate bodies is located between the other one of the pressure plates and the fractured rock sample.
In a possible implementation manner, the first sealing baffle and the second sealing baffle are both made of heat insulating materials.
In one possible implementation manner, a side of the movable plate away from the fractured rock sample is provided with a first inclined surface; the first drive assembly includes: the supporting frame is arranged on the supporting mechanism; the first driving piece is in threaded connection with the support frame; the push plate is rotatably connected with the end part of the first driving piece, and a second inclined plane matched with the first inclined plane is arranged on one side, facing the movable plate, of the push plate, so that the movable plate moves along the first direction.
In a possible implementation manner, the sides of the two pressure plates, which are far away from the fractured rock sample, are respectively provided with a third inclined surface; the second drive assembly includes: the two fixed inclined plates are oppositely arranged in the placing groove along the second direction, and fourth inclined planes matched with the third inclined planes are respectively arranged on one sides, facing the fractured rock sample, of the two fixed inclined plates; and the two second driving parts are respectively in threaded connection with the supporting mechanism, and the end parts of the two second driving parts are respectively movably connected with the two pressing plates.
In a possible implementation manner, a first sliding groove is formed in the fourth inclined surface of the fixed inclined plate, and the pressing plate is in sliding fit with the fixed inclined plate through the first sliding groove.
In a possible implementation manner, a second sliding groove is formed in the third inclined surface of the pressing plate, and the fixed inclined plate is in sliding fit with the pressing plate through the second sliding groove.
In a possible implementation manner, the heating mechanism further includes a heat conduction layer disposed on a side of the heat source facing the fractured rock sample, and the heat conduction layer abuts against a surface of the fractured rock sample.
In a possible implementation manner, the fractured rock sample is of a cuboid or cube structure, and fracture surfaces perpendicular to the third direction are arranged on the fractured rock sample.
In a second aspect, the present application provides a fractured rock mass seepage heat transfer system, including:
the seepage heat transfer device for the fractured rock mass as described above; the pressure loading system comprises a bracket, a supporting platform, a driving mechanism and a rigid arm, wherein the supporting platform is arranged on the bracket in a sliding manner and used for supporting the fractured rock mass seepage heat transfer device, the driving mechanism is used for driving the supporting platform to move along the third direction, and the rigid arm is arranged on the bracket and opposite to the supporting platform; the data acquisition system comprises a temperature sensor for acquiring the temperature of the fractured rock sample and a computer in communication connection with the temperature sensor; the water pressure control system comprises a water injection device communicated with the water inlet pipe and a liquid recovery device communicated with the water outlet pipe; and the temperature control system is used for controlling the heating temperature of the heat source.
In a possible implementation manner, the heating mechanism further comprises a heat conduction layer arranged on one side of the heat source facing the fractured rock sample, and the heat conduction layer is abutted against the surface of the fractured rock sample; the data acquisition system the temperature sensor be provided with a plurality ofly, it is a plurality of the temperature sensor is the matrix structure and sets up on the heat-conducting layer.
According to the fissured rock mass seepage heat transfer device that this application embodiment provided, make roof and fly leaf seal the both sides of fissured rock sample first direction through first drive assembly, make two clamp plates compress tightly fissured rock sample along the both sides of second direction through second drive assembly, the heat source of overheating mechanism heats the both sides of fissured rock sample along the third direction respectively, it is used for to the fissured rock sample water injection to intake the mechanism, water after the heat transfer flows through a water mechanism, improve and seal water effect, effectively avoid the problem of leaking in the experimentation, thereby obtain accurate import and export temperature and flow data, improve the experiment precision.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts. In addition, in the drawings, like parts are denoted by like reference numerals, and the drawings are not drawn to actual scale.
Fig. 1 is a schematic perspective view illustrating a fractured rock mass seepage heat transfer device provided by an embodiment of the application;
fig. 2 is a schematic top view of a fractured rock mass seepage heat transfer device provided by the embodiment of the application;
FIG. 3 shows a cross-sectional view of the experimental setup shown in FIG. 2 in the direction A-A;
FIG. 4 shows a cross-sectional view of the experimental setup shown in FIG. 2 along the direction B-B;
FIG. 5 is a schematic perspective view illustrating a water inlet mechanism provided in an embodiment of the present application;
fig. 6 shows a schematic perspective structure diagram of a water outlet mechanism provided in an embodiment of the present application;
fig. 7 is a schematic perspective view illustrating a supporting mechanism provided in an embodiment of the present application;
fig. 8 is a schematic perspective view illustrating a fixed inclined plate according to an embodiment of the present disclosure;
FIG. 9 is a schematic perspective view of a push plate provided in an embodiment of the present application;
fig. 10 shows a schematic perspective structure of a movable plate provided in an embodiment of the present application;
FIG. 11 is a schematic structural diagram illustrating a fractured rock mass seepage heat transfer system provided by an embodiment of the application;
FIG. 12 shows a schematic structural diagram of a fractured rock sample, a temperature sensor and a heat conducting layer provided by an embodiment of the application.
Description of reference numerals:
x, a first direction; y, a second direction; z, a third direction; a. a fractured rock sample; a1, crack surface;
1. a support mechanism; 11. a placement groove; 12. a support leg;
2. a first water sealing mechanism; 21. a top plate; 22. a movable plate; 221. a through hole; 23. a first drive assembly; 231. a support frame; 232. a first driving member; 233. pushing the plate; 2331. a strip-shaped hole;
3. a second water sealing mechanism; 31. pressing a plate; 32. a second drive assembly; 321. fixing the inclined plate; 3211. a first chute; 322. a second driving member;
4. a water inlet mechanism; 41. a first sealing baffle; 411. a first plate body; 412. a second plate body; 42. a water inlet groove; 43. a water inlet pipe;
5. a water outlet mechanism; 51. a second sealing baffle; 52. a water outlet groove; 53. a water outlet pipe;
6. a heating mechanism; 61. a heat source; 62. a heat conductive layer;
7. a pressure loading system; 71. a support; 72. a support table; 73. a support table; 74. a rigid arm;
8. a data acquisition system; 81. a temperature sensor; 82. a computer;
9. a hydraulic pressure control system; 91. a water injection device; 92. a liquid recovery device;
10. a temperature control system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic perspective view illustrating a fractured rock mass seepage heat transfer device provided by an embodiment of the application; fig. 2 is a schematic top view of a fractured rock mass seepage heat transfer device provided by the embodiment of the application; FIG. 3 shows a cross-sectional view of the experimental setup shown in FIG. 2 in the direction A-A; FIG. 4 shows a cross-sectional view of the experimental setup shown in FIG. 2 along the direction B-B; FIG. 5 is a schematic perspective view illustrating a water inlet mechanism provided in an embodiment of the present application; fig. 6 shows a schematic perspective structure diagram of a water outlet mechanism provided in an embodiment of the present application; fig. 7 is a schematic perspective view illustrating a supporting mechanism provided in an embodiment of the present application; fig. 8 is a schematic perspective view illustrating a fixed inclined plate according to an embodiment of the present disclosure; FIG. 9 is a schematic perspective view of a push plate provided in an embodiment of the present application; fig. 10 shows a perspective structure schematic diagram of a movable plate provided in an embodiment of the present application.
As shown in fig. 1 to 10, the embodiment of the present application provides a fractured rock mass seepage heat transfer device, which includes a supporting mechanism 1, a first water sealing mechanism 2, a second water sealing mechanism 3, a water inlet mechanism 4, a water outlet mechanism 5 and a heating mechanism 6.
The support mechanism 1 has a placement groove 11 for placing the fractured rock sample a.
The first water sealing mechanism 2 comprises a top plate 21 and a movable plate 22 which are oppositely arranged along the first direction X, and a first driving assembly 23 which drives the movable plate 22 to move along the first direction X, wherein the top plate 21 and the movable plate 22 are respectively positioned at two sides of the fractured rock sample a along the first direction X.
As shown in fig. 10, a through hole 221 is formed on the movable plate 22 for the water inlet pipe 43 to pass through, so that the movable plate 22 can only move along the first direction X, and the movable plate is fixedly connected with the first sealing baffle.
The second water sealing mechanism 3 comprises two pressing plates 31 arranged oppositely along the second direction Y and a second driving assembly 32 for driving the two pressing plates 31 to move towards or away from each other, and the two pressing plates 31 are respectively located on two sides of the fractured rock sample a along the second direction Y.
As shown in fig. 5, the water inlet mechanism 4 is disposed on a side of the movable plate 22 facing the fractured rock sample a, and the water inlet mechanism 4 includes a water inlet groove 42 in which a first sealing baffle 41 is disposed on the first sealing baffle 41, and a water inlet pipe 43 communicating with the water inlet groove 42.
As shown in fig. 6, the water outlet mechanism 5 is disposed on the side of the top plate 21 facing the fractured rock sample a, and the water outlet mechanism 5 includes a second sealing baffle 51, a water outlet groove 52 disposed on the first sealing baffle 41, and a water outlet pipe 53 communicating with the water outlet groove 52.
The heating mechanism 6 comprises two heat sources 61 which are oppositely arranged along the third direction Z, and the two heat sources 61 are respectively positioned on two sides of the fractured rock sample a along the third direction Z.
The first direction X is intersected with the second direction Y, the second direction Y is intersected with the third direction Z, and the first direction X is intersected with the third direction Z.
In this application, make roof 21 and fly leaf 22 seal the both sides of the first direction X of fissure rock sample a through first drive assembly 23, make two clamp plates 31 compress tightly fissure rock sample a along the both sides of second direction Y through second drive assembly 32, the heat source 61 of overheating mechanism 6 heats fissure rock sample a along the both sides of third direction Z respectively, mechanism 4 that intakes is used for to fissure rock sample a water injection, water after the heat transfer flows out through mechanism 5 that goes out, improve and seal the water effect, effectively avoid the problem of leaking in the experimentation, thereby it obtains accurate import and export temperature and flow data to lead to, improve the experiment precision.
Specifically, in the present application, the first direction X is perpendicular to the second direction Y, the second direction Y is perpendicular to the third direction Z, the first direction X is perpendicular to the third direction Z, and the third direction Z is a vertical direction.
Specifically, the heat source 61 in the present application employs a thermostatically controlled oil bath.
The support mechanism bottom in this application is also provided with legs 12 to place heat sources 61 on both sides of the fractured rock sample a.
In the embodiment of the present application, the first sealing baffle 41 includes a first plate 411 disposed opposite to the second sealing baffle 51, and two second plates 412 connected to two ends of the first plate 411, respectively, wherein one of the second plates 412 is located between one of the pressure plates 31 and the fractured rock sample a, and the other second plate 412 is located between the other one of the pressure plates 31 and the fractured rock sample a.
In this application, first seal retainer 41 is the U template, seals the both sides of the first direction X of fissure rock sample a through first plate body 411 and the relative setting of second seal retainer 51, seals the both sides of fissure rock sample a second direction Y through the second plate body 412 of two relative settings, further improves and seals water effect.
Specifically, the length of the second seal baffle 51 in the second direction Y is equal to the length of the fractured rock sample a in the second direction Y, the length of the second plate body 412 of the first seal baffle 41 in the first direction X is greater than the length of the fractured rock sample a in the first direction X, and the two ends of the first seal baffle 41 in the second direction Y are respectively abutted to the two second plate bodies 412, so that the first seal baffle 41 and the second seal baffle 51 enclose a frame structure, the periphery of the fractured rock sample a is completely surrounded, and the sealing effect is improved.
In the embodiment of the present application, the first sealing baffle 41 and the second sealing baffle 51 are both made of heat insulating material.
In this application, first seal baffle 41 and second seal baffle 51 all adopt thermal-insulated water proof material, surround the back with crack rock sample a at first seal baffle 41 and second seal baffle 51, not only can realize sealing water, can prevent moreover that crack rock sample a's heat from running off through first seal baffle 41 and second seal baffle 51, further improve the experimental precision.
Specifically, the heat insulating material in the first and second seal dams 41 and 51 may be a polyurethane layer, an asbestos layer, or the like.
The height of the first sealing baffle plate 41 and the height of the second sealing baffle plate 51 along the third direction Z are matched with the height of the fractured rock sample a, so that the first sealing baffle plate 41 and the second sealing plate can fully surround the fractured rock sample a, and the heat insulation effect is further improved.
In the embodiment of the present application, a first inclined plane is disposed on a side of the movable plate 22 away from the fractured rock sample a;
the first drive assembly 23 includes:
a support frame 231 provided on the support mechanism 1;
the first driving member 232 is in threaded connection with the supporting frame 231; and
the push plate 233 is rotatably connected to an end of the first driving member 232, and a side of the push plate 233 facing the movable plate 22 is provided with a second inclined surface cooperating with the first inclined surface, so that the movable plate 22 moves along the first direction X.
Specifically, the first driving member 232 is a bolt, and the first driving member 232 is rotated to drive the push plate 233 to move, and the second inclined surface of the push plate 233 is matched with the first inclined surface of the movable plate 22, so that the movable plate 22 can be pressed when the push plate 233 moves, and the movable plate 22 moves along the first direction X.
As shown in fig. 9, the push plate 233 in the present application moves in the third direction Z, and a strip-shaped hole 2331 is provided in the third direction Z on the push plate 233, and the water inlet pipe 43 penetrates through the strip-shaped hole 2331 to make a moving space for the upward and downward movement of the push plate 233.
Optionally, a sliding groove structure may be further disposed between the push plate 233 and the movable plate 22, so that the push plate 233 and the movable plate 22 are not separated, and the push plate 233 can drive the movable plate 22 to move toward a side away from the fractured rock sample a.
In another embodiment of the present application, an elastic force may be provided to the movable plate 22, and the movable plate 22 moves toward the fractured rock sample a when being pressed by the push plate 233 by a spring, and the movable plate 22 automatically resets under the elastic force when the push plate 233 leaves.
In the embodiment of the application, the sides of the two pressing plates 31 far away from the fractured rock sample a are respectively provided with a third inclined surface;
the second drive assembly 32 includes:
the two fixed inclined plates 321 are oppositely arranged in the placing groove 11 along the second direction Y, and a fourth inclined plane matched with the third inclined plane is respectively arranged on one side, facing the fractured rock sample a, of each of the two fixed inclined plates 321; and
the two second driving members 322 are respectively in threaded connection with the supporting mechanism 1, and the end portions of the two second driving members 322 are respectively movably connected with the two pressing plates 31.
In this application, second driving piece 322 is the bolt, it removes along first direction X to drive clamp plate 31 through rotating second driving piece 322, third inclined plane through clamp plate 31 and the cooperation of the fourth inclined plane of fixed swash plate 321, make clamp plate 31 remove towards fracture rock sample a, thereby pressurize first seal baffle 41's second plate body 412, make second plate body 412 and fracture rock sample a paste tightly, realize sealedly, it is concrete, set up the movable groove in the junction of clamp plate 31 and second driving piece 322, the tip of second driving piece 322 is provided with circular lug, circular lug both can realize rotating in clamp plate 31's movable groove, can guarantee again that clamp plate 31 can take place the displacement on second direction Y.
In this application, first seal baffle 41 has certain elasticity, and when placing fracture rock sample a, second plate body 412 through first seal baffle 41 can be automatic with fracture rock sample a centre gripping, then increases the pressure between second plate body 412 and the fracture rock sample a through the extrusion of clamp plate 31, and then guarantees the leakproofness of fracture rock sample a both sides on second direction Y.
Optionally, the second driving assembly 32 in this application may also be a bolt disposed along the second direction Y, and the bolt is in threaded connection with the supporting mechanism 1, and directly drives the pressing plate 31 to move along the second direction Y through the bolt.
Further, a first sliding groove 3211 is disposed on a fourth inclined surface of the fixed inclined plate 321, and the pressing plate 31 is in sliding fit with the fixed inclined plate 321 through the first sliding groove 3211.
In this application, the pressing plate 31 is in sliding fit with the first sliding groove 3211 on the fixed sloping plate 321, so that the fixed sloping plate 321 and the pressing plate 31 can relatively slide along the third sloping surface, and the pressing plate 31 can be driven to release the extrusion on the first seal baffle 41 when the second driving member 322 rotates in the reverse direction.
Specifically, the first sliding groove 3211 is a T-shaped groove or a dovetail groove.
In another embodiment of the present application, a second sliding groove is disposed on the third inclined surface of the pressing plate 31, and the fixed sloping plate 321 is in sliding fit with the pressing plate 31 through the second sliding groove.
In this application, fixed swash plate 321 is through with the second spout sliding fit on the clamp plate 31 for the clamp plate 31 can slide along the third inclined plane, thereby makes and can drive clamp plate 31 and relieve the extrusion to first seal baffle 41 when the second driving piece 322 of antiport.
Specifically, the second sliding groove is a T-shaped groove or a dovetail groove.
In the embodiment of the present application, the heating mechanism 6 further includes a heat conduction layer 62 disposed on a side of the heat source 61 facing the fractured rock sample a, and the heat conduction layer 62 abuts against a surface of the fractured rock sample a.
In this application, heat-conducting layer 62 chooses for use high heat conduction material, selects to use metallic copper in this application, and heat source 61 gives fissured rock sample a with heat uniform transfer through heat-conducting layer 62, considers that heat-conducting layer 62's thermal resistance is infinitely little, and then the effect is the temperature that heat source 61 provided promptly with the temperature on fissured rock sample surface, improves the homogeneity of heating, and can not cause thermal loss. Specifically, the heat conducting layer 62 is made of metal copper with the thickness of 1cm-1.5cm, and the heat conducting layer 62 is abutted against two outer surfaces of the fractured rock sample a in the third direction Z.
In the embodiment of the application, the fractured rock sample a is of a cuboid or cube structure, and a fracture surface a1 perpendicular to the third direction Z is arranged on the fractured rock sample a.
When current crack rock sample a seepage flow heat transfer experiment, mostly select for use the crack sample of cylinder, cramp the cylinder sample through the ring, be responsible for the heating of sample simultaneously, in case appear the seepage between ring and sample like this, the whole surface of sample will be spread all over to the water that oozes to cause very big influence to the experiment. And choose the experimental apparatus of this application to use and can cut fissured rock sample a into cuboid or square structure, so both make things convenient for first water sealing mechanism 2 and second water sealing mechanism 3 to seal fissured rock sample a, can improve the homogeneity of heating moreover, fissured rock sample a's fissure face a1 is located the centre of two heating mechanism 6.
This fracture rock mass seepage heat transfer device, make roof 21 and fly leaf 22 seal the both sides of the first direction X of fracture rock sample a through first drive assembly 23, make two clamp plates 31 compress tightly fracture rock sample a along the both sides of second direction Y through second drive assembly 32, the heat source 61 of overheating mechanism 6 heats fracture rock sample an along the both sides of third direction Z respectively, water inlet mechanism 4 is used for to fracture rock sample a water injection, water after the heat transfer flows out through water outlet mechanism 5, improve and seal the water effect, effectively avoid the problem of leaking in the experimentation, thereby it imports and exports temperature and flow data to obtain the accuracy, improve the experiment precision.
FIG. 11 is a schematic structural diagram illustrating a fractured rock mass seepage heat transfer system provided by an embodiment of the application; FIG. 12 shows a schematic structural diagram of a fractured rock sample, a temperature sensor and a heat conducting layer provided by an embodiment of the application.
As shown in fig. 11-12, the present application provides a fractured rock mass seepage heat transfer system, including:
the fractured rock mass seepage heat transfer device;
the pressure loading system 7 comprises a bracket 71, a support platform 72 which is arranged on the bracket 71 in a sliding manner and used for supporting the fractured rock mass seepage heat transfer device, a driving mechanism 73 for driving the support platform 72 to move along the third direction Z, and a rigid arm 74 which is arranged on the bracket 71 and is opposite to the support platform 72;
the data acquisition system 8, the data acquisition system 8 comprises a temperature sensor 81 for acquiring the temperature of the fractured rock sample a and a computer 82 in communication connection with the temperature sensor 81;
the hydraulic control system 9, the hydraulic control system 9 includes the water injection device 91 communicated with the water inlet pipe 43 and the liquid recovery device 92 communicated with the water outlet pipe 53; and
and a temperature control system 10 for controlling the heating temperature of the heat source 61.
In this application, pressure loading system 7 drives brace table 72 through actuating mechanism 73 and removes along third direction Z, carries on spacingly through rigid arm 74 to the one end of crack rock sample a to carry out axial pressurization to crack rock sample a, the seepage flow heat transfer condition under the different water pressure circumstances of survey, its pressure loading scope: 0-80MPa, force measurement accuracy: less than or equal to +/-1 percent; force measurement resolution: 10N; and (3) loading stroke: 100 mm; force loading speed: 0.01-20 kN/s.
The data acquisition system 8 detects the temperature of the surface of the fractured rock sample a through the temperature sensor 81, converts the detected temperature information into an electric signal and transmits the electric signal to the computer 82 for statistical analysis.
Water pressure control system 9 specifically is water tank, water pump and pressure sensor to inlet tube 43 injected water through water injection device 91 to control water injection water pressure retrieves the water that infiltrates through fissure rock sample a through liquid recovery device 92, and weighs the water of retrieving for data analysis, the water pressure scope of providing is: 0-52 MPa.
The primary function of the temperature control system 10 is to interface with the heat source 61 to provide a stable temperature environment for the experiment. The temperature loading range is as follows: 10-150 ℃.
In the embodiment of the present application, the heating mechanism 6 further includes a heat conduction layer 62 disposed on one side of the heat source 61 facing the fractured rock sample a, and the heat conduction layer 62 abuts against the surface of the fractured rock sample a;
the temperature sensors 81 of the data acquisition system 8 are provided in plural, and the plural temperature sensors 81 are provided in a matrix configuration on the heat conductive layer 62.
In this application, temperature sensor 81 installs on heat-conducting layer 62, and is concrete, can set up the mounting groove on heat-conducting layer 62, installs temperature sensor 81 in heat-conducting layer 62's mounting groove for temperature sensor 81 and fissured rock sample a butt can detect fissured rock sample a's surface temperature. Since the thermal resistance of the thermally conductive layer 62 can be infinitely small, the thermally conductive layer 62 does not affect the detection of the temperature sensor 81. Further, can also set up the heat insulating mattress in heat-conducting layer 62's mounting groove, separate through the heat insulating mattress between temperature sensor 81 and the heat-conducting layer 62 for heat-conducting layer 62 both can realize the carrier as temperature sensor 81, can guarantee again that temperature sensor 81 accurately detects the temperature on fissured rock sample a surface, can not destroy fissured rock sample's surface.
Specifically, 3 rows and 6 columns of temperature sensors 81 are mounted on each heat conduction layer 62, and 18 temperature sensors are obtained in total, so that a large amount of rock surface temperature data can be obtained through real-time measurement, and the temperature field distribution condition of the rock surface can be observed in the experimental process; in addition, a temperature sensor 81 may extend along outlet tube 53 into outlet channel 52 to measure the temperature of the water in real time.
The specific working mode of the seepage heat transfer system for fractured rocks is as follows:
s1, preparing a sample: different from most existing experimental devices, the experimental device needs to process a rock sample into a cubic sample of 100mm multiplied by 50mm-100mm (length multiplied by width multiplied by height), and meanwhile, needs to repeatedly polish the surface of the sample, so that the sample can be in close contact with each part of the device. And preparing a single-fracture rock sample a through a splitting or shearing experiment, and processing a fracture surface a1 on the fracture rock sample a to obtain the fracture rock sample a.
S2, sample installation: after the fractured rock sample a is prepared, firstly, heat-resistant glue is adopted to carry out first-step water sealing on fractures on two sides of a non-inlet and a non-outlet of the sample, then the sample is placed in the placing groove 11 of the supporting mechanism 1, and water sealing and heat insulation treatment on the periphery of the fractured rock sample a are completed through the first water sealing mechanism 2 and the second water sealing mechanism 3.
S3, detecting the water sealing effect: and after the fractured rock sample a is installed, starting a water pressure loading system, and introducing water for a period of time to detect the water sealing effect of the device. If the water sealing effect is good, the experiment is continued, and if the water sealing effect is not good, the step of S2 is repeated to continue water sealing of the sample.
S4, installing an experimental device: after the optimal water sealing effect is achieved, the experimental device provided with the fractured rock sample a is installed in the pressure loading system 7. And respectively attaching the upper surface and the lower surface of the fractured rock sample a to the two heating mechanisms 6. After the installation is completed, the pressure loading system 7 is started to preliminarily fix the experimental device.
S5, start experiment: starting the temperature control system 10, providing the same temperature on the upper surface and the lower surface of the fractured rock sample a until the rock sample is completely heated to the target temperature, and stopping heating; and opening the water injection device 91 to enable water with lower temperature to flow through the cracks of the crack rock sample a, so that heat exchange is carried out between the water and the high-temperature rock.
S6, the data acquisition system 8 measures the temperature of the inlet and outlet water of the fracture and the surface temperature of the fractured rock sample a in real time in the experiment process; the hydraulic control system 9 controls and records the osmotic pressure and the flow, and the liquid recovery device 92 weighs the outlet water.
S7, finishing the experiment: and after the seepage heat transfer experiment under all working conditions is completed, closing the water pressure loading system, the temperature control system 10 and the pressure loading system 7 in sequence. And after the sample and the seepage heat transfer device are cooled to room temperature, relieving confining pressure, taking out the sample, cleaning the experimental device for next use, and ending the experiment.
The system can be used for carrying out a hydrothermal migration experiment on fractured rock masses under different axial pressures, surrounding rock temperatures and hydraulic gradients.
Compared with the existing experimental device, the experimental device has a good water sealing effect, and meanwhile, the method of heating the upper surface and the lower surface of the fractured rock sample a is adopted, so that the obtained water temperature and flow rate results of the inlet and the outlet are more accurate; the device can obtain a large amount of temperature data of the rock surface, thereby researching the change of the rock block surface temperature field in the seepage heat transfer process of the fractured rock mass.
It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
It should be readily understood that "on … …", "above … …" and "above … …" in this disclosure should be interpreted in its broadest sense such that "on … …" means not only "directly on something", but also includes the meaning of "on something" with intervening features or layers therebetween, and "above … …" or "above … …" includes not only the meaning of "above something" or "above" but also includes the meaning of "above something" or "above" with no intervening features or layers therebetween (i.e., directly on something).
Furthermore, spatially relative terms, such as "below," "lower," "above," "upper," and the like, may be used herein for ease of description to describe one element or feature's illustrated relationship to another element or feature. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may have other orientations (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly as well.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (11)
1. A fractured rock mass seepage heat transfer device is characterized by comprising:
the supporting mechanism is provided with a placing groove for placing the fractured rock sample;
the first water sealing mechanism comprises a top plate and a movable plate which are oppositely arranged along a first direction, and a first driving assembly for driving the movable plate to move along the first direction, wherein the top plate and the movable plate are respectively positioned on two sides of the fractured rock sample along the first direction;
the second water sealing mechanism comprises two pressure plates which are oppositely arranged along a second direction and a second driving assembly which drives the two pressure plates to move in the opposite direction or in the opposite direction, and the two pressure plates are respectively positioned on two sides of the fractured rock sample along the second direction;
the water inlet mechanism is arranged on one side of the movable plate, which faces the fractured rock sample, and comprises a water inlet groove and a water inlet pipe, wherein the first sealing baffle is arranged on the first sealing baffle;
the water outlet mechanism is arranged on one side, facing the fractured rock sample, of the top plate and comprises a second sealing baffle plate, a water outlet groove arranged on the first sealing baffle plate and a water outlet pipe communicated with the water outlet groove; and
the heating mechanism comprises two heat sources which are oppositely arranged along a third direction, and the two heat sources are respectively positioned on two sides of the fractured rock sample along the third direction;
the first direction and the second direction are arranged in an intersecting mode, the second direction and the third direction are arranged in an intersecting mode, and the first direction and the third direction are arranged in an intersecting mode.
2. The fractured rock mass seepage heat transfer device of claim 1, wherein the first sealing baffle comprises a first plate body arranged opposite to the second sealing baffle and two second plate bodies connected with two ends of the first plate body respectively, one of the second plate bodies is positioned between one of the pressing plates and the fractured rock sample, and the other second plate body is positioned between the other pressing plate and the fractured rock sample.
3. The fractured rock mass seepage heat transfer device of claim 1, wherein the first sealing baffle and the second sealing baffle are both made of heat insulating materials.
4. The fractured rock mass seepage heat transfer device of claim 1, wherein one side of the movable plate away from the fractured rock sample is provided with a first inclined surface;
the first drive assembly includes:
the supporting frame is arranged on the supporting mechanism;
the first driving piece is in threaded connection with the support frame; and
the push plate is rotatably connected with the end part of the first driving piece, and a second inclined plane matched with the first inclined plane is arranged on one side, facing the movable plate, of the push plate, so that the movable plate moves along the first direction.
5. The fractured rock mass seepage heat transfer device according to claim 1, wherein one sides of the two pressing plates, which are far away from the fractured rock sample, are respectively provided with a third inclined surface;
the second drive assembly includes:
the two fixed inclined plates are oppositely arranged in the placing groove along the second direction, and fourth inclined planes matched with the third inclined planes are respectively arranged on one sides, facing the fractured rock sample, of the two fixed inclined plates; and
and the two second driving parts are respectively in threaded connection with the supporting mechanism, and the end parts of the two second driving parts are respectively movably connected with the two pressing plates.
6. The fractured rock mass seepage heat transfer device of claim 5, wherein a first sliding groove is formed in the fourth inclined surface of the fixed inclined plate, and the pressing plate is in sliding fit with the fixed inclined plate through the first sliding groove.
7. The fractured rock mass seepage heat transfer device of claim 5, wherein a second sliding groove is formed in the third inclined surface of the pressing plate, and the fixed inclined plate is in sliding fit with the pressing plate through the second sliding groove.
8. The fractured rock mass seepage heat transfer device of claim 1, wherein the heating mechanism further comprises a heat conduction layer arranged on one side of the heat source facing the fractured rock sample, and the heat conduction layer abuts against the surface of the fractured rock sample.
9. The fractured rock mass seepage heat transfer device according to claim 1, wherein the fractured rock sample is of a cuboid or cube structure, and fracture surfaces perpendicular to the third direction are arranged on the fractured rock sample.
10. A fractured rock mass seepage heat transfer system is characterized by comprising:
a fractured rock mass seepage heat transfer device according to any one of claims 1 to 9;
the pressure loading system comprises a bracket, a supporting platform, a driving mechanism and a rigid arm, wherein the supporting platform is arranged on the bracket in a sliding manner and used for supporting the fractured rock mass seepage heat transfer device, the driving mechanism is used for driving the supporting platform to move along the third direction, and the rigid arm is arranged on the bracket and opposite to the supporting platform;
the data acquisition system comprises a temperature sensor for acquiring the temperature of the fractured rock sample and a computer in communication connection with the temperature sensor;
the water pressure control system comprises a water injection device communicated with the water inlet pipe and a liquid recovery device communicated with the water outlet pipe; and
and the temperature control system is used for controlling the heating temperature of the heat source.
11. The fractured rock mass seepage heat transfer system of claim 10, wherein the heating mechanism further comprises a heat conducting layer disposed on a side of the heat source facing the fractured rock sample, the heat conducting layer abutting a surface of the fractured rock sample;
the data acquisition system the temperature sensor be provided with a plurality ofly, it is a plurality of the temperature sensor is the matrix structure and sets up on the heat-conducting layer.
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