CN208283195U - A kind of experimental provision of liquid nitrogen combination far-infrared thermal radiation Frozen-thawed cycled - Google Patents
A kind of experimental provision of liquid nitrogen combination far-infrared thermal radiation Frozen-thawed cycled Download PDFInfo
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- CN208283195U CN208283195U CN201820705367.7U CN201820705367U CN208283195U CN 208283195 U CN208283195 U CN 208283195U CN 201820705367 U CN201820705367 U CN 201820705367U CN 208283195 U CN208283195 U CN 208283195U
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 208
- 239000007788 liquid Substances 0.000 title claims abstract description 104
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 104
- 230000005855 radiation Effects 0.000 title claims abstract description 83
- 239000003245 coal Substances 0.000 claims abstract description 67
- 239000007789 gas Substances 0.000 claims abstract description 45
- 238000002347 injection Methods 0.000 claims abstract description 44
- 239000007924 injection Substances 0.000 claims abstract description 44
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 210000004907 gland Anatomy 0.000 claims description 29
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 3
- 230000001351 cycling effect Effects 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 10
- 238000010079 rubber tapping Methods 0.000 abstract description 8
- 238000011161 development Methods 0.000 abstract description 5
- 238000011160 research Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000006835 compression Effects 0.000 abstract 2
- 238000007906 compression Methods 0.000 abstract 2
- 238000010257 thawing Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000012424 Freeze-thaw process Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
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Abstract
A kind of experimental provision of liquid nitrogen combination far-infrared thermal radiation Frozen-thawed cycled, is related to Unconventional gas production technique field, including three axis compression systems, liquid nitrogen feed system, far-infrared thermal radiation integrated control system, acoustic emission detection system and coal sample；Three axis compression systems include triaxial apparatus, axis pressure control system and confining pressure control system；Triaxial apparatus includes upper press cover, cylinder body, lower cover and push-down head, and lower cover is equipped with axis and presses external tapping, and axis pressure external tapping is connected to axis pressure control system；The side wall of cylinder body is equipped with confining pressure external tapping, and confining pressure external tapping is connected to confining pressure control system；Far-infrared thermal radiation integrated control system includes that end, far-infrared thermal radiation control terminal, temperature sensor and temp controlled meter occur for far-infrared thermal radiation；Liquid nitrogen feed system is located at outside cylinder body, and liquid nitrogen feed system includes liquid nitrogen container, liquid nitrogen injection pump and liquid nitrogen injection pipe；Acoustic emission detection system is located at outside cylinder body.Experimental provision provided by the utility model has extensive practicability in cbm development research field.
Description
Technical Field
The utility model relates to an unconventional natural gas exploitation technical field, in particular to liquid nitrogen combines experimental apparatus of far infrared thermal radiation freeze thawing cycle.
Background
The coal bed gas belongs to unconventional natural gas, is clean and high-quality energy and chemical raw materials which rise internationally in nearly twenty years, is commonly called 'gas', mainly comprises methane, is important clean energy, and is very rich in coal bed gas reserves which are proved in China at present.
In order to realize the industrial production of coal bed gas, researchers at home and abroad propose gas yield increasing methods such as high-pressure water injection, hydraulic slotting, hydraulic fracturing, presplitting blasting, gas injection displacement and the like, and a plurality of new technologies such as an electrochemical method, a solvent extraction method and the like are also proposed successively, but the methods have certain limitations. In recent years, the permeability-increasing technology of freeze-thaw cycle cracking of a coal bed by utilizing liquid nitrogen action is gradually developed, but certain limitations exist, the temperature of a coal bed gas reservoir is greatly reduced under the action of liquid nitrogen, the activity of the coal bed gas is seriously influenced, the gas is difficult to be converted from an adsorption state into a free state, meanwhile, the speed of the freeze-thaw process is slow in a natural state, and water lock effect can be generated by residual moisture in coal, so that the exploitation efficiency is seriously influenced. The application of far infrared thermal radiation to the production increase of the coal bed gas is a new research field, and the purpose of the production increase of the coal bed gas is realized by combining liquid nitrogen and far infrared rays for mutual assistance, so that an experimental device is needed, an experimental platform is provided for laboratory research, and theoretical support is further provided for the application to field exploitation.
SUMMERY OF THE UTILITY MODEL
The utility model provides a be not enough to prior art, the utility model provides a liquid nitrogen combines experimental apparatus of far infrared thermal radiation freeze thawing cycle for the feasibility of verifying the exploitation technique that realizes the coal bed gas output increase with the mode that liquid nitrogen and far infrared combine provides theoretical support for being applied to the on-the-spot exploitation.
The utility model provides an experimental device for freeze thawing cycle combining liquid nitrogen with far infrared thermal radiation, which comprises a triaxial pressurizing system, a liquid nitrogen supply system, a far infrared thermal radiation integrated control system, an acoustic emission detection system and a coal sample;
the three-axis pressurization system comprises a three-axis instrument, an axis pressure control system and a confining pressure control system; the triaxial apparatus comprises an upper gland, a cylinder body, a lower gland and a lower pressure head, wherein the upper gland is fixedly connected with the top end part of the cylinder body, the lower gland is fixedly connected with the bottom end part of the cylinder body, the lower pressure head is positioned in the cylinder body, the bottom end of the lower pressure head is attached to the lower pressure head, a coal sample is positioned in the cylinder body, one end of the coal sample is attached to the top end of the lower pressure head, and the other end of the coal sample is attached to the inner surface of the upper gland; the lower pressing cover is provided with an axial pressure external interface which is communicated with an axial pressure control system, and the axial pressure control system is positioned outside the cylinder body; the side wall of the cylinder body is provided with an confining pressure external port which is communicated with a confining pressure control system, and the confining pressure control system is positioned outside the cylinder body;
the far infrared heat radiation integrated control system comprises a far infrared heat radiation generating end, a far infrared heat radiation control end, a temperature sensor and a temperature control meter; the top of the upper gland is provided with a far infrared thermal radiation external interface, the far infrared thermal radiation generating end is positioned in the coal sample, the far infrared thermal radiation control end is connected with the far infrared thermal radiation generating end through a circuit penetrating through the far infrared thermal radiation external interface, the temperature sensor is positioned in the coal sample and close to the far infrared thermal radiation generating end, the temperature control meter is positioned outside the cylinder body and close to the far infrared thermal radiation control end, and signals sent by the temperature sensor can be transmitted to the temperature control meter;
the liquid nitrogen supply system is positioned outside the cylinder body and comprises a liquid nitrogen tank, a liquid nitrogen injection pump and a liquid nitrogen injection pipe, the top of the upper gland is provided with a liquid nitrogen injection external interface, and the liquid nitrogen injection external interface is adjacent to the far infrared thermal radiation external interface; the liquid nitrogen injection pipe is positioned in the coal sample and is arranged in parallel with the far infrared heat radiation generating end; the liquid nitrogen injection pump is connected with the liquid nitrogen tank through a pipeline, and the liquid nitrogen injection pump is connected with the liquid nitrogen injection pipe through a pipeline penetrating through the liquid nitrogen injection external interface;
the acoustic emission detection system is located outside the cylinder.
The cylinder body is in a circular tube shape.
The top end of the lower gland is provided with a square groove, the lower pressure head is square, and the lower pressure head is positioned in the square groove; the bottom of pressure head is equipped with the cylinder base down, the space that cylinder base and square groove formed is the hydraulic pressure chamber, the external interface of axle pressure communicates with the hydraulic pressure chamber.
The acoustic emission detection system comprises an acoustic emission detection point and an acoustic emission receiver, the acoustic emission detection point is positioned on the side wall of the cylinder body, the acoustic emission receiver is positioned outside the cylinder body, and signals of the acoustic emission detection point can be transmitted to the acoustic emission receiver;
the coal sample is square, a prefabricated drill hole is formed in the top of the coal sample, the far infrared heat radiation external interface and the liquid nitrogen injection external interface are communicated with the prefabricated drill hole, and the temperature sensor, the liquid nitrogen injection pipe and the far infrared heat radiation generation end are located in the prefabricated drill hole.
The confining pressure control system comprises a gas tank, wherein a gas pressure regulating valve, a gas pressure controller and a gas pressure sensor arranged in the gas tank are arranged on the gas tank, the gas pressure regulating valve is connected with the gas pressure controller, and the gas tank is connected with a pipeline communicated with the confining pressure external port; the gas tank, the air pressure regulating valve and the air pressure sensor are all existing products.
The shaft pressure control system comprises a hydraulic pressure controller and a hydraulic pressure controller, a hydraulic valve and a built-in hydraulic pressure sensor are arranged on the hydraulic pump, and the hydraulic pump is connected with a pipeline communicated with the shaft pressure external interface; the hydraulic pump, the hydraulic controller, the hydraulic valve and the hydraulic pressure sensor are all existing products.
And a liquid nitrogen switch is arranged on the liquid nitrogen tank.
And a sealing sleeve is sleeved on the side wall of the coal sample.
The utility model provides an experimental apparatus of liquid nitrogen combination far infrared freeze thawing cycle combines liquid nitrogen and far infrared heat radiation together, and multiple fracturing effect complementary action of each other that sends improves the coal seam and increases the infiltration effect with higher speed freeze thawing cycle, still is provided with acoustic emission detecting system in experimental apparatus, can obtain the situation of change of freeze thawing cycle in-process coal seam structure in real time. The utility model provides an experimental apparatus that liquid nitrogen combines far infrared freeze thawing cycle simple structure, the dependable performance, convenient operation has extensive practicality in coal bed gas development research field.
Drawings
FIG. 1 is a schematic structural diagram of an experimental apparatus for freeze-thaw cycle combining liquid nitrogen with far infrared thermal radiation provided by the present invention;
FIG. 2 is a schematic diagram of the structural distribution of a triaxial apparatus and a coal sample in an experimental apparatus for freeze-thaw cycle combining liquid nitrogen with far infrared thermal radiation;
FIG. 3 is a schematic structural distribution diagram of a lower gland and a lower gland in an experimental apparatus for freeze-thaw cycle combining liquid nitrogen with far infrared thermal radiation provided by the present invention;
wherein,
1 triaxial apparatus, 2 axle load control system, 3 confining pressure control system, 4 upper gland, 5 cylinder bodies, 6 lower gland, 7 lower pressure heads, 8 axle load external tapping, 9 confining pressure external tapping, 10 far infrared heat radiation generation ends, 11 far infrared heat radiation control ends, 12 temperature sensor, 13 far infrared heat radiation external tapping, 14 liquid nitrogen tank, 15 liquid nitrogen injection pump, 16 liquid nitrogen injection pipe, 17 liquid nitrogen injection external tapping, 18 cylinder base, 19 hydraulic pressure chamber, 20 acoustic emission check points, 21 acoustic emission receiver, 22 prefabricated drilling, 23 liquid nitrogen switch, 99 coal sample.
Detailed Description
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
In order to solve the problems in the prior art, as shown in fig. 1 to 3, the utility model provides an experimental device for freeze-thaw cycle combining liquid nitrogen with far infrared thermal radiation, which comprises a triaxial pressurizing system, a liquid nitrogen supply system, a far infrared thermal radiation integrated control system, an acoustic emission detection system and a coal sample 99;
as shown in fig. 1, the triaxial pressurizing system includes a triaxial apparatus 1, an axial pressure control system 2 and a confining pressure control system 3; the triaxial apparatus 1 comprises an upper gland 4, a cylinder body 5, a lower gland 6 and a lower pressure head 7, wherein the cylinder body 5 is in a round tube shape, the upper gland 4 is fixedly connected with the top end part of the cylinder body 5 through a bolt, and the lower gland 6 is fixedly connected with the bottom end part of the cylinder body 5 through a bolt;
the lower pressure head 7 is positioned in the cylinder body 5, and the bottom end of the lower pressure head 7 is attached to the top end of the lower pressure cover 6; the top end of the lower gland 6 is provided with a square groove, the lower pressure head 7 is square, and the lower pressure head 7 is positioned in the square groove;
the coal sample 99 is square, the coal sample 99 is positioned in the cylinder body 5, one end of the coal sample 99 is jointed with the top end of the lower pressure head 7 in a joint way, and the other end of the coal sample 99 is jointed with the inner surface of the upper pressure cover 4 in a joint way; the cylinder 5 having a circular tube shape can hold the square coal sample 99. The side wall cover of coal sample 99 has the seal cover, and the seal cover of coal sample 99, last gland 4 and lower pressure head 7 play the sealed effect to coal sample 99, with coal sample and external isolated, avoid the influence of other factors in the external world.
As shown in fig. 1 and 3, a cylindrical base 18 is arranged at the bottom of the lower pressure head 7, and a space formed by the cylindrical base 18 and the square groove is a hydraulic cavity 19;
the lower gland 6 is provided with an axial pressure external interface 8, and the axial pressure external interface 8 is communicated with the hydraulic cavity 19.
The shaft pressure external interface 8 is communicated with the shaft pressure control system 2, and the shaft pressure control system 2 is positioned outside the cylinder body 5; the shaft pressure control system 2 comprises a hydraulic pump and a hydraulic controller, wherein a hydraulic valve and a hydraulic pressure sensor are arranged on the hydraulic pump, the hydraulic controller is connected with the hydraulic pump, and the hydraulic pump is connected with a pipeline communicated with the shaft pressure external interface 8; the hydraulic pump, the hydraulic valve, the hydraulic controller and the hydraulic pressure sensor are all existing products. The axle pressure control system 2 sets a hydraulic pressure value through the hydraulic controller, when the hydraulic pressure sensor monitors that the hydraulic pressure value is lower than a set value, the hydraulic pressure sensor feeds back a signal to the hydraulic controller, and the hydraulic controller controls the hydraulic valve to supplement pressure.
An confining pressure external port 9 is arranged on the side wall of the cylinder body 5 and close to the bottom, the confining pressure external port 9 is communicated with the confining pressure control system 3, and the confining pressure control system 3 is positioned outside the cylinder body 5; the confining pressure control system 3 comprises a gas tank, wherein a gas pressure regulating valve, a gas pressure controller and a gas pressure sensor arranged in the gas tank are arranged on the gas tank, the gas pressure regulating valve is connected with the gas pressure controller, and a pipeline communicated with a confining pressure external port 9 is connected to the gas tank; the gas tank, the air pressure regulating valve and the air pressure sensor are all existing products. The confining pressure control system 3 can set a pressure value through the air pressure controller, and when the air pressure sensor monitors that the pressure value is lower than the set value, the air pressure sensor transmits a signal to the air pressure controller to adjust the supplementary pressure of the air pressure regulating valve.
The far infrared heat radiation integrated control system comprises a far infrared heat radiation generating end 10, a far infrared heat radiation control end 11, a temperature sensor 12 and a temperature control meter; the top of the upper gland 4 is provided with a far infrared heat radiation external interface 13, and the far infrared heat radiation generation end 10 is positioned in the coal sample 99.
The far infrared heat radiation control end 11 is connected with the far infrared heat radiation generation end 10 through a circuit penetrating through the far infrared heat radiation external interface 13, the temperature sensor 12 is positioned in the coal sample 99 and close to the far infrared heat radiation generation end 10, the temperature control meter is positioned outside the cylinder body 5 and close to the far infrared heat radiation control end 11, and signals sent by the temperature sensor 12 can be transmitted to the temperature control meter; the temperature sensor 12, the temperature control meter, the far infrared thermal radiation control terminal 11 and the far infrared thermal radiation generation terminal 10 are all existing products, and are not shown in the temperature control meter diagram.
The liquid nitrogen supply system is positioned outside the cylinder body 5 and comprises a liquid nitrogen tank 14, a liquid nitrogen injection pump 15 and a liquid nitrogen injection pipe 16, wherein a liquid nitrogen switch 23 is arranged on the liquid nitrogen tank 14, a liquid nitrogen injection external interface 17 is arranged at the top of the upper gland 4, and the liquid nitrogen injection external interface 17 is adjacent to the far infrared thermal radiation external interface 13; the liquid nitrogen injection pipe 16 is positioned in the coal sample 99 and is placed in parallel with the far infrared heat radiation generation end 10; the liquid nitrogen injection pump 15 is connected with the liquid nitrogen tank 14 through a liquid nitrogen pipeline, and the liquid nitrogen injection pump 15 is connected with the liquid nitrogen injection pipe 16 through a liquid nitrogen pipeline penetrating through the liquid nitrogen injection external interface 17. The liquid nitrogen tank 14 and the liquid nitrogen injection pump 15 are conventional products and will not be described in detail.
The top of the coal sample 99 is provided with a prefabricated drill hole 22, the far infrared heat radiation external interface 13 and the liquid nitrogen injection external interface 17 are communicated with the prefabricated drill hole 22, and the temperature sensor 12, the liquid nitrogen injection pipe 16 and the far infrared heat radiation generation end 10 are all positioned in the prefabricated drill hole 22.
The acoustic emission detection system is positioned outside the cylinder body 5 and comprises an acoustic emission detection point 20 and an acoustic emission receiver 21, the acoustic emission detection point 20 is positioned on the side wall of the cylinder body 5, the acoustic emission receiver 21 is positioned outside the cylinder body 5, and signals of the acoustic emission detection point 20 can be transmitted to the acoustic emission receiver 21; the acoustic emission detection point 20 and the acoustic emission receiver 21 are prior art and will not be described in detail. The number of the acoustic emission detection points 20 mentioned in this embodiment may be multiple according to actual requirements, and in this embodiment, the number of the acoustic emission detection points 20 is one.
The experimental method adopting the experimental device for freeze-thaw cycle combining liquid nitrogen with far infrared thermal radiation comprises the following steps:
step one, mounting a coal sample 99: installing a sealing sleeve on the coal sample 99, placing the coal sample 99 in the cylinder body 5, aligning the coal sample 99 with the lower pressing head 7, and connecting the upper pressing cover 4 and the lower pressing cover 6 with the cylinder body 5 through bolts;
step two, performing a freeze-thaw cycle test: the shaft pressure control system 2 is communicated with the shaft pressure external interface 8, shaft pressure is loaded, the lower pressure head 7 is pushed, and the lower pressure head 7 generates acting force on the coal sample 99; communicating the confining pressure control system 3 with a confining pressure external interface 9, and loading confining pressure to stress the side wall of the coal sample 99; different axial pressure and confining pressure loads simulate different ground stress conditions, namely the simulation of different stratum conditions is realized on the coal sample 99;
step three, performing a liquid nitrogen freezing test stage: conveying liquid nitrogen in a liquid nitrogen tank 14 into a coal sample 99 through a liquid nitrogen injection external port 17 and a liquid nitrogen injection pipe 16 by a liquid nitrogen injection pump 15 to realize a freezing test stage of the liquid nitrogen;
step four, carrying out an infrared thermal radiation experiment: the far infrared heat radiation generation end 10 is controlled by the far infrared heat radiation control end 11 to output the infrared heat radiation to the coal sample 99, the power of the far infrared heat radiation control end 11 is adjusted according to the temperature displayed by the signal transmitted to the temperature control meter by the temperature sensor 12, when the temperature is too high, the power of the far infrared heat radiation control end 11 can be adjusted to be small, otherwise, when the temperature is too low, the power is adjusted to be large;
step five, using acoustic emission monitoring: and (4) monitoring the test processes of the second step, the third step and the fourth step, namely the freeze-thaw cycle process in real time through an acoustic emission detection system. The acoustic emission signal can be generated in the process of crushing the coal sample 99, the signal is received by the acoustic emission detection system, and the acoustic emission detection system processes the acoustic emission signal, so that the change condition of the structure of the coal sample 99, namely the development condition of the pore fractures of the coal sample can be obtained. Changes in the structure of the coal sample 99 include continued expansion of the native pore fissures of the coal sample and the creation and development of new pore fissures.
The utility model provides an experimental apparatus of liquid nitrogen combination far infrared freeze thawing cycle combines liquid nitrogen and far infrared heat radiation together, and multiple fracturing effect complementary action of each other that sends improves the coal seam and increases the infiltration effect with higher speed freeze thawing cycle, still is provided with acoustic emission detecting system in experimental apparatus, can obtain the situation of change of freeze thawing cycle in-process coal seam structure in real time. The utility model provides an experimental apparatus that liquid nitrogen combines far infrared freeze thawing cycle simple structure, the dependable performance, convenient operation has extensive practicality in coal bed gas development research field.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (9)
1. An experimental device for freeze-thaw cycle combining liquid nitrogen with far infrared thermal radiation is characterized by comprising a triaxial pressurizing system, a liquid nitrogen supply system, a far infrared thermal radiation integrated control system, an acoustic emission detection system and a coal sample (99);
the three-axis pressurization system comprises a three-axis instrument (1), an axis pressure control system (2) and a confining pressure control system (3); the triaxial apparatus (1) comprises an upper gland (4), a cylinder body (5), a lower gland (6) and a lower pressure head (7), wherein the upper gland (4) is fixedly connected with the top end part of the cylinder body (5), the lower pressure head (6) is fixedly connected with the bottom end part of the cylinder body (5), the lower pressure head (7) is positioned in the cylinder body (5), the bottom end of the lower pressure head (7) is attached to the lower pressure head (6), a coal sample (99) is positioned in the cylinder body (5), one end of the coal sample (99) is attached to the top end of the lower pressure head (7), and the other end of the coal sample (99) is attached to the inner surface of the upper gland (4); the lower gland (6) is provided with an axial pressure external interface (8), the axial pressure external interface (8) is communicated with the axial pressure control system (2), and the axial pressure control system (2) is positioned outside the cylinder body (5); an confining pressure external port (9) is arranged on the side wall of the cylinder body (5), the confining pressure external port (9) is communicated with a confining pressure control system (3), and the confining pressure control system (3) is positioned outside the cylinder body (5);
the far infrared heat radiation integrated control system comprises a far infrared heat radiation generating end (10), a far infrared heat radiation control end (11), a temperature sensor (12) and a temperature control meter; the top of the upper gland (4) is provided with a far infrared heat radiation external interface (13), the far infrared heat radiation generation end (10) is positioned in the coal sample (99), the far infrared heat radiation control end (11) is connected with the far infrared heat radiation generation end (10) through a circuit penetrating through the far infrared heat radiation external interface (13), the temperature sensor (12) is positioned in the coal sample (99) and close to the far infrared heat radiation generation end (10), the temperature control meter is positioned outside the cylinder body (5) and close to the far infrared heat radiation control end (11), and signals sent by the temperature sensor (12) can be transmitted to the temperature control meter;
the liquid nitrogen supply system is positioned outside the cylinder body (5), the liquid nitrogen supply system comprises a liquid nitrogen tank (14), a liquid nitrogen injection pump (15) and a liquid nitrogen injection pipe (16), the top of the upper gland (4) is provided with a liquid nitrogen injection external interface (17), and the liquid nitrogen injection external interface (17) is adjacent to the far infrared thermal radiation external interface (13); the liquid nitrogen injection pipe (16) is positioned in the coal sample (99) and is arranged in parallel with the far infrared heat radiation generating end (10); the liquid nitrogen injection pump (15) is connected with the liquid nitrogen tank (14) through a pipeline, and the liquid nitrogen injection pump (15) is connected with the liquid nitrogen injection pipe (16) through a pipeline penetrating through a liquid nitrogen injection external interface (17);
the acoustic emission detection system is located outside the cylinder (5).
2. The experimental device for freeze-thaw cycle combining liquid nitrogen and far infrared thermal radiation as claimed in claim 1, wherein the cylinder body (5) is in a shape of a circular pipe.
3. The experimental device for freeze-thaw cycling combining liquid nitrogen and far infrared thermal radiation is characterized in that a square groove is formed in the top end of the lower gland (6), the lower pressure head (7) is square, and the lower pressure head (7) is located in the square groove; the bottom of the lower pressure head (7) is provided with a cylindrical base (18), a space formed by the cylindrical base (18) and the square groove is a hydraulic cavity (19), and the shaft pressure external interface (8) is communicated with the hydraulic cavity (19).
4. An experimental set-up for freeze-thaw cycle combining liquid nitrogen with far infrared thermal radiation according to claim 1, characterized in that the acoustic emission detection system comprises acoustic emission detection points (20) and an acoustic emission receiver (21), the acoustic emission detection points (20) are located on the side wall of the cylinder body (5), the acoustic emission receiver (21) is located outside the cylinder body (5), and the signal of the acoustic emission detection points (20) can be transmitted to the acoustic emission receiver (21).
5. The experimental device for freeze-thaw cycling combining liquid nitrogen and far infrared thermal radiation according to claim 1, wherein the coal sample (99) is square, a prefabricated borehole (22) is arranged at the top of the coal sample (99), the far infrared thermal radiation external port (13) and the liquid nitrogen injection external port (17) are both communicated with the prefabricated borehole (22), and the temperature sensor (12), the liquid nitrogen injection pipe (16) and the far infrared thermal radiation generation end (10) are all located in the prefabricated borehole (22).
6. The experimental device for freeze-thaw cycle combining liquid nitrogen and far infrared thermal radiation as claimed in claim 1, wherein the confining pressure control system (3) comprises a gas tank, the gas tank is provided with a gas pressure regulating valve, a gas pressure controller and a gas pressure sensor arranged in the gas tank, the gas pressure regulating valve is connected with the gas pressure controller, and the gas tank is connected with a pipeline communicated with the confining pressure external port (9); the gas tank, the air pressure regulating valve, the air pressure controller and the air pressure sensor are all existing products.
7. The experimental device for freeze-thaw cycle combining liquid nitrogen and far infrared thermal radiation as claimed in claim 1, wherein the axle pressure control system (2) comprises a hydraulic pump and a hydraulic controller, the hydraulic pump is provided with a hydraulic valve and a built-in hydraulic pressure sensor, the hydraulic controller is connected with the hydraulic pump, and the hydraulic pump is connected with a pipeline communicated with the axle pressure external port (8); the hydraulic pump, the hydraulic controller, the hydraulic valve and the hydraulic pressure sensor are all existing products.
8. The experimental device for freeze-thaw cycle combining liquid nitrogen with far infrared thermal radiation as claimed in claim 1, wherein a liquid nitrogen switch (23) is disposed on the liquid nitrogen tank (14).
9. The experimental device for freeze-thaw cycle combining liquid nitrogen and far infrared thermal radiation as claimed in claim 1, wherein a sealing sleeve is sleeved on a side wall of the coal sample (99).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820705367.7U CN208283195U (en) | 2018-05-11 | 2018-05-11 | A kind of experimental provision of liquid nitrogen combination far-infrared thermal radiation Frozen-thawed cycled |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820705367.7U CN208283195U (en) | 2018-05-11 | 2018-05-11 | A kind of experimental provision of liquid nitrogen combination far-infrared thermal radiation Frozen-thawed cycled |
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| CN208283195U true CN208283195U (en) | 2018-12-25 |
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| CN201820705367.7U Withdrawn - After Issue CN208283195U (en) | 2018-05-11 | 2018-05-11 | A kind of experimental provision of liquid nitrogen combination far-infrared thermal radiation Frozen-thawed cycled |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108398334A (en) * | 2018-05-11 | 2018-08-14 | 辽宁工程技术大学 | A kind of experimental provision and experimental method of liquid nitrogen combination far-infrared thermal radiation Frozen-thawed cycled |
-
2018
- 2018-05-11 CN CN201820705367.7U patent/CN208283195U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108398334A (en) * | 2018-05-11 | 2018-08-14 | 辽宁工程技术大学 | A kind of experimental provision and experimental method of liquid nitrogen combination far-infrared thermal radiation Frozen-thawed cycled |
| CN108398334B (en) * | 2018-05-11 | 2023-11-07 | 辽宁工程技术大学 | Experimental device and experimental method for freezing and thawing cycle by combining liquid nitrogen with far infrared heat radiation |
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