CN112147057A - Experimental device for observing thermal performance and structural damage of liquid nitrogen injected coal body - Google Patents
Experimental device for observing thermal performance and structural damage of liquid nitrogen injected coal body Download PDFInfo
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- CN112147057A CN112147057A CN202011203294.XA CN202011203294A CN112147057A CN 112147057 A CN112147057 A CN 112147057A CN 202011203294 A CN202011203294 A CN 202011203294A CN 112147057 A CN112147057 A CN 112147057A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 253
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 122
- 239000007788 liquid Substances 0.000 title claims abstract description 106
- 239000003245 coal Substances 0.000 title claims abstract description 80
- 238000002347 injection Methods 0.000 claims abstract description 36
- 239000007924 injection Substances 0.000 claims abstract description 36
- 238000001931 thermography Methods 0.000 claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 17
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 9
- 230000006835 compression Effects 0.000 claims description 36
- 238000007906 compression Methods 0.000 claims description 36
- 229910001220 stainless steel Inorganic materials 0.000 claims description 18
- 239000010935 stainless steel Substances 0.000 claims description 18
- 238000001291 vacuum drying Methods 0.000 claims description 15
- 230000009471 action Effects 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 9
- 239000013589 supplement Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims 4
- 230000008859 change Effects 0.000 abstract description 6
- 230000035699 permeability Effects 0.000 abstract description 6
- 239000003795 chemical substances by application Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 9
- 208000010392 Bone Fractures Diseases 0.000 description 6
- 206010017076 Fracture Diseases 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 5
- 238000002309 gasification Methods 0.000 description 4
- 230000001502 supplementing effect Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000023753 dehiscence Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000001965 increasing effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels; Explosives
- G01N33/222—Solid fuels, e.g. coal
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- General Health & Medical Sciences (AREA)
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- Immunology (AREA)
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention discloses an experimental device for observing thermal properties and structural damage of liquid nitrogen injected coal, which comprises a drying system, a liquid nitrogen injection system, an exhaust system, a pressurization system, an infrared thermal imaging system and a crack observation system, wherein the liquid nitrogen injection system, the exhaust system and the pressurization system are fixedly connected, a pressure reducer is arranged between a liquid nitrogen tank and a low temperature resistant pipeline, the liquid nitrogen is connected with a low temperature resistant valve through a pipeline, a liquid nitrogen pump is arranged on the pipeline between the valve and an ultra low temperature resistant flowmeter, a gas flow agent and an adapter are arranged on a nitrogen discharge pipeline, and all system units are connected through electric wires. This survey liquid nitrogen and pour into coal body calorifics performance and structural damage experimental apparatus into, through the mode of annotating the liquid nitrogen, change the holistic micro-fine structural feature of coal body, promote the primary hole crack of coal body to develop, new crack produces, effectively improves the permeability of coal body to can survey coal sample calorifics performance change and the crack condition of developing in the liquid nitrogen injection in-process in real time, mechanical properties damage condition around obtaining coal sample liquid nitrogen injection, carry out the quantitative description calorifics performance and surface, inner structure damage condition simultaneously.
Description
Technical Field
The invention relates to the technical field of coal, in particular to an experimental device for observing thermal properties and structural damage of coal injected with liquid nitrogen.
Background
The gas occurrence in China is rich, but most coal seams containing gas have low permeability, so that the exploitation is difficult to realize, and the artificial permeability increase of the coal seams is the key for solving the gas extraction of the low-permeability coal seams.
The liquid nitrogen has extremely low temperature (-196 ℃), no pollution to the environment, easy preparation and low cost. The coal is a natural geologic body with low strength, low cleat, micro-crack, pore and other defect structures, and low-temperature liquid nitrogen is injected into the coal body to weaken the freezing damage of the coal body structure, expand the primary micro-crack and generate new cracks to form a freeze-thaw dehiscence zone.
Volume sharply expands (1 m) after liquid nitrogen gasification3After the liquid nitrogen is gasified, the volume reaches 696m at 21 DEG C3) If the coal sample is sealed, the liquid nitrogen gasification can generate huge expansive force in the coal body to crack the coal body, a gasification high-pressure cracking zone is formed, the structure of the coal sample is damaged, the crack development of the coal sample is further promoted, and the permeability of the coal body is improved.
The observation and quantitative description of the permeation increasing effect of the liquid nitrogen injected coal body still need to be further improved, the experimental device can perform observation and quantitative description from surface structure damage and energy change in real time, and obtain the mechanical damage of the internal structure of the coal body before and after injection.
Disclosure of Invention
The invention aims to provide an experimental device for observing thermal properties and structural damage of liquid nitrogen injected coal, which has the advantages of improving the gas disaster prevention and control and gas resource development level and solves the problems in the prior art.
In order to realize the purpose, the invention provides the following technical scheme: an experimental device for observing thermal performance and structural damage of liquid nitrogen injected coal comprises a drying system, a liquid nitrogen injection system, an exhaust system, a pressurization system, an infrared thermal imaging system and a fracture observation system; the liquid nitrogen injection system, the exhaust system and the pressurization system are fixedly connected; the drying system comprises an air exhaust pipeline (3), a vacuum pump (4), a vacuum drying box (10) and a table (11), wherein the vacuum pump is connected with the vacuum drying box (10) through the air exhaust pipeline (3), and the table (11) is used for placing the vacuum drying box (10).
Further, liquid nitrogen injection system includes in liquid nitrogen container (1), rail guard (2), the bottle manometer (5), stainless steel pressure reducer (6), low temperature resistant pipeline manometer (7), low temperature resistant valve (8), stainless steel chain (9), liquid nitrogen pump (12), resistant ultra-low temperature flowmeter (13), low temperature resistant pipeline (14), unipolar compressor arrangement upper portion (15), liquid nitrogen injection mouth (1401), experiment coal sample (18), rail guard (2) and the one end fixed connection of stainless steel chain (9), other end activity lock joint are used for preventing that liquid nitrogen container (1) from empting, low temperature resistant pipeline (14) are in unipolar compressor arrangement upper portion (15), experiment coal sample (18) are buried in liquid nitrogen injection mouth (1401), liquid nitrogen passes through in the bottle manometer (5), stainless steel pressure reducer (6) through low temperature resistant pipeline (14), stainless steel pressure reducer (6), And a low-temperature-resistant pipeline pressure gauge (7), a low-temperature-resistant valve (8), a liquid nitrogen pump (12) and an ultralow-temperature-resistant flow agent (13) are injected into the experimental coal sample (18) from a liquid nitrogen injection port (1401).
Further, exhaust system includes nitrogen gas discharge line (23), nitrogen gas entry (2301), gas flowmeter (24), switching mouth (25), liquid gas exhaust hose (29), outdoor (30), for practice thrift the cost make nitrogen gas discharge to outdoor (30) from nitrogen gas exhaust hose (29) through switching mouth (25), nitrogen gas discharge line (23) are inside single-shaft compression device upper portion (15).
Furthermore, the pressurization system comprises a single-shaft compression device upper part (15), a single-shaft compression protection box (16), an experimental coal body (18), a single-shaft compression device lower part (20), a host computer (27) and a display screen (28), wherein the single-shaft compression device lower part (20) has two actions of device lower part downward action (2001) and device lower part upward action (2002), and the actions are carried out on the single-shaft compression device lower part (20) by the host computer (27) through a device lower part control line (2003).
Further, infrared thermal imaging system includes thermal imaging collection system (19), thermal imaging processor (22), host computer (27), display screen (28), thermal imaging collection system (19) comprises 1901 infrared thermal imaging lens, 1902 brace table, 1903 infrared thermal imaging transmission line.
Further, the crack observation device comprises a crack observation device (17), a crack development image processor (21), a data transmission line (26), a host (27) and a display screen (28), wherein the crack observation device (17) comprises a hard electric wire (1701), a focusing knob (1702), a support rod (1703), a crack observation main body (1704), a light supplement switch (1705), a leveling bubble (1706) observation switch (1707), a light supplement light source (1708), a bracket tray (1709), a crack observation data return line (17010), a rod-one-section fixing knob (17011), a rod-two-section fixing knob (17012), a tray lower part fixing knob (17013) and a tray lower fixing ring (17014), the leveling bubble (1706) is fixed on the bracket tray (1709) to perform device leveling, the tray lower fixing ring (17014) is fixed by a tray lower fixing knob (17013), and the support rod (3) is fixed by the rod-one-section fixing knob (17011), The two-section fixing knob (17012) of the rod is fixed to play a supporting role.
Furthermore, the pressure gauge (5) in the bottle, the low temperature resistant pipeline pressure gauge (7) and the stainless steel pressure reducer (6) are connected into a whole and are all made of low temperature resistant materials.
Furthermore, a pipeline connecting the liquid nitrogen pump (12) and the stainless steel pressure reducer (6) is provided with a low temperature resistant valve (8).
Furthermore, an ultralow temperature resistant flowmeter (13) is arranged on the pipeline between the liquid nitrogen pump (12) and the liquid nitrogen injection port (1401).
Furthermore, the liquid nitrogen injection port (1401) is provided with a liquid nitrogen auxiliary outlet (14011) and a liquid nitrogen outlet (14012).
Furthermore, the experimental coal body is a cylindrical coal sample with the diameter of 100mm and the height of 150 mm.
Furthermore, a single-shaft compression shield box (16) is used to prevent the cracked coal sample from splashing during the single-shaft compression, and the single-shaft compression is performed by a single-shaft compression device lower part (20) to generate a device lower part upward motion (2002).
Furthermore, the end of the nitrogen inlet (2301) to the adapter (25) is a low temperature resistant pipeline, and the tail end of the nitrogen discharge pipeline (23) is provided with a gas flowmeter (24) and the adapter (25).
The invention has the beneficial effects that: according to the invention, by means of injecting liquid nitrogen, the overall microscopic structural characteristics of the coal body are changed, the primary pore crack development and new crack generation of the coal body are promoted, the permeability of the coal body is effectively improved, the thermal property change and crack development condition of the coal sample in the liquid nitrogen injection process can be observed in real time, the mechanical property damage condition before and after injecting liquid nitrogen into the coal sample is obtained, and the thermal property and the surface and internal structure damage condition are quantitatively described at the same time
Drawings
FIG. 1 is an overall block diagram of the invention;
FIG. 2 is a system for observing fissure development;
FIG. 3 is a thermal imaging acquisition layout;
FIG. 4 is a liquid nitrogen injection end line.
In the figure: 1 liquid nitrogen tank, 2 protective guard, 3 air exhaust pipeline, 4 vacuum pump, 5 in-bottle pressure gauge, 6 stainless steel pressure reducer, 7 low temperature resistant pipeline pressure gauge, 8 low temperature resistant valve, 9 stainless steel chain, 10 vacuum drying box, 11 table, 12 liquid nitrogen pump, 13 ultra low temperature resistant flux, 14 low temperature resistant pipeline, 1401 liquid nitrogen inlet, 14011 liquid nitrogen auxiliary outlet, 14012 liquid nitrogen outlet, 15 single shaft compression device upper part, 16 single shaft compression protective box, 17 crack observation device, 1701 hard wire, 1702 focusing knob, 1703 support rod, 1704 crack observation body, 1705 light supplement switch, 1706 leveling bubble, 1707 observation switch, 1708 light supplement light source, 1709 support tray, 17010 crack observation data return line, 17011 rod one-section fixing knob, 17012 rod two-section fixing knob, 17013 tray lower part fixing knob, 17014 tray lower part fixing ring, 18 experiment coal body, 19 thermal imaging device acquisition device, 1901 infrared thermal imaging lens, 1902 support table, 1903 infrared thermal imaging transmission line, 20 single-shaft compression device lower part, 2001 device lower part downward action, 2002 device lower part upward action, 2003 device lower part control line, 21 crack development image processor, 22 thermal imaging processor, 23 nitrogen gas discharge pipeline, 2301 nitrogen gas inlet, 24 gas flowmeter, 25 switching port, 26 data transmission line, 27 host computer, 28 display screen, 29 nitrogen gas discharge hose, 30 outdoor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
Referring to fig. 1, an experimental apparatus for observing thermal properties and structural damage of liquid nitrogen injected coal includes a drying system, a liquid nitrogen injection system, an exhaust system, a pressurization system, an infrared thermal imaging system, and a fracture observation system; the liquid nitrogen injection system, the exhaust system and the pressurization system are fixedly connected; the drying system is composed of an air exhaust pipeline 3, a vacuum pump 4, a vacuum drying box 10 and a table 11, wherein the vacuum pump is connected with the vacuum drying box 10 through the air exhaust pipeline 3, and the table 11 is used for placing the vacuum drying box 10; the liquid nitrogen injection system is composed of a liquid nitrogen tank 1, a protective guard 2, an in-bottle pressure gauge 5, a stainless steel pressure reducer 6, a low temperature resistant pipeline pressure gauge 7, a low temperature resistant valve 8, a stainless steel chain 9, a liquid nitrogen pump 12, an ultralow temperature resistant flow agent 13, a low temperature resistant pipeline 14, an upper part 15 of a single-shaft compression device, a liquid nitrogen injection port 1401, and an experimental coal sample 18, wherein the liquid nitrogen injection port is shown in figure 4; the protective guard 2 is fixedly connected with one end of the stainless steel chain 9, and the other end of the protective guard is movably buckled and connected to prevent the liquid nitrogen tank 1 from toppling; a low temperature resistant pipeline 14 is arranged in the upper part 15 of the single-shaft compression device; the liquid nitrogen injection port 1401 is embedded with the experimental coal sample 18; liquid nitrogen passes through a low temperature resistant pipeline 14, a pressure gauge 5 in the bottle, a stainless steel pressure reducer 6, a low temperature resistant pipeline pressure gauge 7, a low temperature resistant valve 8, a liquid nitrogen pump 12 and an ultralow temperature resistant flow agent 13 and is injected into an experimental coal sample 18 from a liquid nitrogen injection port 1401; the exhaust system is composed of a nitrogen exhaust pipeline 23, a nitrogen inlet 2301, a gas flowmeter 24, a switching port 25, a liquid-gas exhaust hose 29 and an outdoor unit 30; the nitrogen is discharged to the outside 30 from the nitrogen discharge hose 29 through the adapter 25 for cost saving; a nitrogen gas discharge line 23 is inside the single-shaft compression device upper portion 15; the pressurizing system consists of a single-shaft compression device upper part 15, a single-shaft compression protective box 16, an experimental coal body 18, a single-shaft compression device lower part 20, a host 27 and a display screen 28; referring to FIG. 3, the single-shaft compression apparatus lower portion 20 has an apparatus lower portion downward motion 2001 and an apparatus lower portion upward motion 2002; the action is performed by the host 27 operating the single-axis compression device lower portion 20 through the device lower control line 2003; the infrared thermal imaging system consists of a thermal imaging acquisition device 19, a thermal imaging processor 22, a host 27 and a display screen 28; please refer to fig. 3, the thermal imaging acquisition device 19 is composed of an infrared thermal imaging lens 1901, a support 1902, and an infrared thermal imaging transmission line 1903; the fracture observation system consists of a fracture observation device 17, a fracture development image processor 21, a data transmission line 26, a host 27 and a display screen 28; please refer to fig. 2 the crack observation device 17 includes a hard wire 1701, a focusing knob 1702, a support bar 1703, a crack observation body 1704, a light supplement switch 1705, a leveling bubble 1706, an observation switch 1707, a light supplement light source 1708, a bracket tray 1709, a crack observation data return line 17010, a first rod fixing knob 17011, a second rod fixing knob 17012, a lower tray fixing knob 17013, and a lower tray fixing ring 17014, wherein the leveling bubble 1706 is fixed on the bracket tray 1709 for leveling the device; the tray lower fixing ring 17014 is fixed by a tray lower fixing knob 17013; the support bar 1703 is fixed by a first-stage fixing knob 17011 and a second-stage fixing knob 17012, and plays a supporting role.
Further, the in-bottle pressure gauge 5, the low temperature resistant pipeline pressure gauge 7 and the stainless steel pressure reducer 6 are connected into a whole and are all made of low temperature resistant materials.
Preferably, a pipeline connecting the liquid nitrogen pump 12 and the stainless steel pressure reducer 6 is provided with a low temperature resistant valve 8.
Preferably, a flow meter 13 resistant to ultra-low temperature is installed in a pipe between the liquid nitrogen pump 12 and the liquid nitrogen injection port 1401.
Preferably, the liquid nitrogen injection port 1401 is provided with a liquid nitrogen auxiliary outlet 14011 and a liquid nitrogen outlet 14012.
Preferably, the experimental coal body 18 is a cylindrical coal sample with a diameter of 100mm and a height of 150 mm.
Preferably, the uniaxial compression is performed by using a uniaxial compression shield 16 to prevent the crushed coal sample from splashing, and generating a device lower portion upward motion 2002 from a uniaxial compression device lower portion 20 to perform uniaxial compression.
Preferably, the end of the nitrogen inlet 2301 to the adapter 25 is a low temperature resistant pipe, and the tail end of the nitrogen exhaust pipeline 23 is provided with a gas flowmeter 24 and the adapter 25.
The working process is as follows: firstly, a vacuum drying oven 10 is used for completely drying coal, the vacuum drying oven 10 and a vacuum pump 4 are connected with a power supply, an experimental coal sample 18 is placed in the vacuum drying oven 10, the vacuum drying oven 10 is vacuumized by turning on the power supply of the vacuum pump 4, the vacuum drying oven 10 is turned on and then is set to be dried at a drying temperature for vacuum drying, the experimental coal sample 18 is taken out and placed on a bearing table at the lower part 20 of a single-shaft compression device, the single-shaft compression protection box 16 is arranged, a host 27 is operated through a display screen 28 to enable a control line 2003 at the lower part of the device to transmit signals, the lower part of the device moves upwards 2002, the upper end of the experimental coal sample 18 is tightly attached and sealed with the upper part 15 of the single-shaft compression device, then liquid nitrogen injection experiment is carried out, a low temperature resistant valve 8 of a liquid nitrogen tank 1 is opened, and the pressure of the liquid nitrogen pressure resistant pipeline 7 is controlled by, The flow velocity passes through the ultralow temperature resistant flow agent 13 and is injected into the experimental coal body from the liquid nitrogen auxiliary outlet 14011 and the liquid nitrogen outlet 14012 of the liquid nitrogen injection port 1401; meanwhile, the infrared thermal imaging system and the fracture observation system are opened for observation, nitrogen formed by gasification of liquid nitrogen in coal gas enters the nitrogen discharge pipeline 23 from the nitrogen inlet 2301, passes through the gas flowmeter 24, and is discharged out of the room 30 through the liquid-gas discharge hose 29 of the adapter 25; after the observation and the liquid nitrogen injection are finished, the host computer 27 is operated through the display screen 28 to enable the control line 2003 on the lower part of the device to transmit signals, the lower part of the device is enabled to move upwards 2002, the experimental coal sample 18 is completely fractured, and mechanical parameters such as a stress-strain curve, compressive strength and elastic modulus of the experimental coal sample 18 can be obtained and compared with the coal sample without the injected liquid nitrogen to obtain the damage of the mechanical properties of the coal sample caused by the injected liquid nitrogen; the infrared thermal imaging system is used when liquid nitrogen starts to be injected, the infrared thermal imaging lens 1901 of the table is placed on the support table 1902, and infrared thermal imaging collection is carried out on the nitrogen injection experiment coal sample 18 and is transmitted to the host 27 through the thermal imaging processor 22 to be displayed on the display screen 28; the crack observation system is used in a mode of being crossed with the infrared thermal imaging system when liquid nitrogen starts to be injected, the influence of a light supplementing light source 1708 on infrared thermal imaging is avoided, a supporting rod 1703 is lengthened to pass through a rod one-section fixing knob 17011 and a rod two-section fixing knob 17012 to be fixed, a bracket tray 1709 is fixed through a tray lower fixing knob 17013 through a tray lower fixing ring 17014 and is leveled through a leveling bubble 1706, a crack observation main body 1704, a fixedly connected hard electric wire 1701 and the light supplementing light source 1708 are placed on the bracket tray 1709, an observation switch 1707 is opened, the light supplementing switch 1705 is opened when photographing is needed, the focusing knob 1702 is rotated to perform focusing, observed cracks are transmitted to a display screen 28 image soft piece through a crack development image processor 21, a data transmission line 26 and a host 27, software and camera magnification ratio are adjusted to be consistent, the coal sample width, area and digitization crack can be adjusted, and the coal sample can be wide and, And quantitatively measuring characteristic parameters such as length and the like.
In summary, the following steps: this survey liquid nitrogen and pour into coal body calorifics performance and structural damage experimental apparatus into, through the mode of annotating the liquid nitrogen, change the holistic micro-fine structural feature of coal body, promote the primary hole crack of coal body to develop, new crack produces, effectively improves the permeability of coal body to can survey coal sample calorifics performance change and the crack condition of developing in the liquid nitrogen injection in-process in real time, mechanical properties damage condition around obtaining coal sample liquid nitrogen injection, carry out the quantitative description calorifics performance and surface, inner structure damage condition simultaneously.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (11)
1. The utility model provides an survey liquid nitrogen and pour into coal body thermology performance and structural damage experimental apparatus into, includes drying system, liquid nitrogen injection system, exhaust system, pressurization system, infrared thermal imaging system, crack observation system, its characterized in that: the liquid nitrogen injection system, the exhaust system and the pressurization system are fixedly connected,
the drying system comprises an air pumping pipeline (3), a vacuum pumping pump (4) and a vacuum drying box (10), wherein the vacuum pumping pump is connected with the vacuum drying box (10) through the air pumping pipeline (3);
the liquid nitrogen injection system comprises a liquid nitrogen tank (1), a pressure gauge (5) in the bottle, a stainless steel pressure reducer (6), a low-temperature-resistant pipeline pressure gauge (7), a low-temperature-resistant valve (8), a liquid nitrogen pump (12), an ultralow-temperature-resistant flowmeter (13), a low-temperature-resistant pipeline (14), a single-shaft compression device upper part (15) and a liquid nitrogen injection port (1401), wherein the low-temperature-resistant pipeline (14) is arranged in the single-shaft compression device upper part (15).
2. The experimental device for observing thermal property and structural damage of liquid nitrogen injected coal according to claim 1, characterized in that: the exhaust system comprises a nitrogen exhaust pipeline (23), a nitrogen inlet (2301), a gas flowmeter (24), a switching port (25) and a liquid-gas exhaust hose (29), wherein the nitrogen exhaust pipeline (23) is arranged inside the upper part (15) of the single-shaft compression device.
3. The experimental device for observing thermal property and structural damage of liquid nitrogen injected coal according to claim 1, characterized in that: the pressurization system comprises a single-shaft compression device upper portion (15), a single-shaft compression protection box (16), an experimental coal body (18), a single-shaft compression device lower portion (20), a host computer (27) and a display screen (28), wherein the single-shaft compression device lower portion (20) has two actions of device lower portion downward action (2001) and device lower portion upward action (2002), and the action is realized by the host computer (27) through a device lower portion control line (2003) to operate the single-shaft compression device lower portion (20).
4. The experimental device for observing thermal property and structural damage of liquid nitrogen injected coal according to claim 1, characterized in that: the infrared thermal imaging system comprises a thermal imaging acquisition device (19), a thermal imaging processor (22), a host (27) and a display screen (28), wherein the thermal imaging acquisition device (19) is composed of a 1901 infrared thermal imaging lens, a 1902 supporting platform and a 1903 infrared thermal imaging transmission line.
5. The experimental device for observing thermal property and structural damage of liquid nitrogen injected coal according to claim 1, characterized in that: the crack observation system comprises a crack observation device (17), a crack development image processor (21), a data transmission line (26), a host (27) and a display screen (28), wherein the crack observation device (17) comprises a hard electric wire (1701), a focusing knob (1702), a support rod (1703), a crack observation main body (1704), a light supplement switch (1705), a leveling bubble (1706) observation switch (1707), a light supplement light source (1708), a bracket tray (1709), a crack observation data return line (17010), a first rod fixing knob (17011), a second rod fixing knob (17012), a lower tray fixing knob (17013) and a lower tray fixing ring (17014), the leveling bubble (1706) is fixed on the bracket tray (1709), the lower tray fixing ring (17014) is fixed by the lower tray fixing knob (17013), and the support rod (1703) is fixed by the first rod fixing knob (11), The two-section fixing knob (17012) of the rod is fixed.
6. The experimental device for observing thermal property and structural damage of liquid nitrogen injected coal according to claim 1, characterized in that: manometer (5), low temperature resistant pipeline manometer (7) are connected as a whole with stainless steel pressure reducer (6) in the bottle, and all are low temperature resistant material.
7. The experimental device for observing thermal property and structural damage of liquid nitrogen injected coal according to claim 1, characterized in that: and a low-temperature resistant valve (8) is arranged on a pipeline connecting the liquid nitrogen pump (12) and the stainless steel pressure reducer (6).
8. The experimental device for observing thermal property and structural damage of liquid nitrogen injected coal according to claim 1, characterized in that: and an ultralow temperature resistant flowmeter (13) is arranged on the pipelines of the liquid nitrogen pump (12) and the liquid nitrogen injection port (1401).
9. The experimental device for observing thermal property and structural damage of liquid nitrogen injected coal according to claim 1, characterized in that: and a liquid nitrogen auxiliary outlet (14011) and a liquid nitrogen outlet (14012) are arranged on the liquid nitrogen injection port (1401).
10. The experimental device for observing thermal property and structural damage of liquid nitrogen injected coal according to claim 3, characterized in that: the experimental coal body (18) is a cylindrical coal sample with the diameter of 100mm and the height of 150 mm.
11. The experimental device for observing thermal property and structural damage of liquid nitrogen injected coal according to claim 1, characterized in that: and the end of the nitrogen inlet (2301) to the adapter (25) is a low-temperature-resistant material pipeline.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114264791A (en) * | 2021-12-23 | 2022-04-01 | 中国矿业大学 | Measuring device and method for simulating phase change expansion pressure of underground coal seam low-temperature fluid |
| CN114609017A (en) * | 2022-05-11 | 2022-06-10 | 西南交通大学 | Open pore distribution characteristic measuring device for open-graded water distribution stabilized macadam permeable base layer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114264791A (en) * | 2021-12-23 | 2022-04-01 | 中国矿业大学 | Measuring device and method for simulating phase change expansion pressure of underground coal seam low-temperature fluid |
| CN114264791B (en) * | 2021-12-23 | 2022-08-12 | 中国矿业大学 | Measuring device and method for simulating phase change expansion pressure of underground coal seam low-temperature fluid |
| CN114609017A (en) * | 2022-05-11 | 2022-06-10 | 西南交通大学 | Open pore distribution characteristic measuring device for open-graded water distribution stabilized macadam permeable base layer |
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