CN105136837B - Liquid nitrogen circulating freeze-thawing permeability-increasing simulation test system and method for coal rock sample - Google Patents
Liquid nitrogen circulating freeze-thawing permeability-increasing simulation test system and method for coal rock sample Download PDFInfo
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- CN105136837B CN105136837B CN201510444636.XA CN201510444636A CN105136837B CN 105136837 B CN105136837 B CN 105136837B CN 201510444636 A CN201510444636 A CN 201510444636A CN 105136837 B CN105136837 B CN 105136837B
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 279
- 239000007788 liquid Substances 0.000 title claims abstract description 173
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 139
- 239000003245 coal Substances 0.000 title claims abstract description 94
- 238000010257 thawing Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000012360 testing method Methods 0.000 title claims abstract description 32
- 239000011435 rock Substances 0.000 title claims abstract description 25
- 238000004088 simulation Methods 0.000 title claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 11
- 239000000523 sample Substances 0.000 claims description 80
- 230000008014 freezing Effects 0.000 claims description 16
- 238000007710 freezing Methods 0.000 claims description 16
- 238000004172 nitrogen cycle Methods 0.000 claims description 15
- 238000010079 rubber tapping Methods 0.000 claims description 13
- 230000005074 turgor pressure Effects 0.000 claims description 10
- 239000011888 foil Substances 0.000 claims description 9
- 238000005516 engineering process Methods 0.000 claims description 8
- 238000002474 experimental method Methods 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 238000005481 NMR spectroscopy Methods 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000012669 compression test Methods 0.000 claims description 3
- 238000002591 computed tomography Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 238000004445 quantitative analysis Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 23
- 238000000605 extraction Methods 0.000 abstract description 5
- 238000010998 test method Methods 0.000 abstract 1
- 230000035699 permeability Effects 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 238000009834 vaporization Methods 0.000 description 4
- 230000008016 vaporization Effects 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000877 morphologic effect Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001028 reflection method Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
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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
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- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a coal rock sample liquid nitrogen circulating freeze-thawing permeability-increasing simulation test system and a method, wherein the test system comprises a freeze-thawing device, a data acquisition system and a coal rock sample, the freeze-thawing device comprises a liquid nitrogen freeze-thawing test box and a self-pressurization liquid nitrogen tank, the coal rock sample is placed in the liquid nitrogen freeze-thawing test box, the liquid nitrogen freeze-thawing test box is connected with the self-pressurization liquid nitrogen tank through a liquid nitrogen supply pipeline, the liquid nitrogen supply pipeline comprises a three-way joint, the three-way joint is connected with the liquid nitrogen freeze-thawing test box, the self-pressurization liquid nitrogen tank and a liquid nitrogen pressurization pipe respectively, and the data acquisition system comprises a high-frequency pressure sensor, a low; the test method repeats liquid nitrogen freeze-thaw cycles for multiple times, and examines the influence rule of strain and temperature on the coal rock sample under different freeze-thaw variables. The method can simulate the process of liquid nitrogen circulating freeze-thawing permeability-increasing coal or rock mass, and provides an achievable experimental platform for gas or shale gas extraction of the liquid nitrogen circulating freeze-thawing permeability-increasing coal and rock mass.
Description
Technical field
The present invention relates to a kind of freezing-thawing test system and method, the especially a kind of anti-reflection mould of coal petrography sample liquid nitrogen cycle freeze thawing
Intend pilot system and method.
Background technology
According to statistics, China's highly gassy mine and the mine for having Gas Outburst dangerous have accounted for the 30% of national mine total quantity
Left and right, and weigh, the high occurrence frequency of especially big pernicious gas accident does not obtain the solution of essence, this seriously will be hampered not
Carry out being smoothed out for China's coal-mine safety in production.Therefore, coal mine gas drainage works, imperative.But China coal seam is more
For high gassy and low permeability coal seam, greatly, gas extraction concentration is relatively low for gas pumping difficulty, most of to be less than 20%.It is at present to adopt more
Increase gas permeability of coal seam with methods such as hydraulic fracturing, hydraulic slotted liner technique and presplit blastings, with mine depth and mining rate
It is continuously increased, the anti-reflection scope of conventional coal seam anti-reflection mash gas extraction method fracturing is small, coal body can not form a wide range of gas pumping and split
Gap net so that gas pumping rate is low, gas control effect is undesirable.Propose that a kind of efficiently anti-reflection gas drainage from coal seam method is to add
The emphasis of deep coal mining diaster prevention and control is cracked soon.
Freeze thawing phenomenon is a kind of common physico-geological function and phenomenon in nature, particularly occurs in difference variation and compares
In big object configurations, such as Qinghai-Tibet Platean, the highway and building of northern area.Freeze-thaw erosion is due to soil and its matrix hole
Moisture in gap or in rock fracture is when freezing, volumetric expansion, crack is increased therewith, increases the caused monoblock soil body or rock
Stone is chipping, and its corrosion stability is greatly lowered after ablation, produces showing for displacement below ground inclined slope aspect under gravity
As.Structural member surface and internal contained humidity freeze and melt be alternately present, referred to as Frozen-thawed cycled.Frozen-thawed cycled is repeatedly
Occur, cause the heavy damage of object configurations.
At ambient pressure, reachable -196 DEG C of liquid nitrogen temperature, the latent heat of vaporization is 5.56kJ/mol, and 1m3 liquid nitrogen can be expanded to
696m321 DEG C of pure gaseous nitrogens, surrounding amount of heat is can absorb during vaporization.Liquid nitrogen has preparation is simple, raw material sources are extensive etc.
Advantage, liquid nitrogen can be used as a kind of efficient refrigeration and anti-reflection medium in coal body Frozen-thawed cycled.
For the deficiency of current mash gas extraction technology, circulating freezing resistance fracturing can be carried out to coal seam by the phase transformation of liquid nitrogen,
A kind of more efficient coal seam anti-reflection method is provided for high gas layer, proposes that a kind of circulated based on horizontal orientation drilling liquid nitrogen is frozen
Melt anti-reflection gas drainage from coal seam method, coal body becomes frost-heave force, liquid nitrogen gasification expansive force and the flowing infiltration of micropore liquid in aqueous phase
Press under collective effect, promote macroscopical crack and micro-crack extension UNICOM in low permeability coal seam, link up gas pumping fracture network, increase
Plus gas permeability of coal seam.Because the anti-reflection gas drainage from coal seam method of liquid nitrogen circulating freezing resistance is influenceed by factors, how in laboratory
The research of the various influence factors rule anti-reflection to coal and rock is carried out, is that the anti-reflection gas drainage from coal seam engineering of liquid nitrogen circulating freezing resistance should
Optimum value with offer scientific basis and theoretical foundation, and each variation of determination is problem in science urgently to be resolved hurrily at present.
The content of the invention
Goal of the invention：It is an object of the invention to provide a kind of anti-reflection simulation experiment system of coal petrography sample liquid nitrogen cycle freeze thawing and
Method, it is intended to which the engineer applied for the anti-reflection gas drainage from coal seam of liquid nitrogen circulating freezing resistance provides scientific basis and theoretical foundation.
To achieve these goals, present invention employs following technical scheme：A kind of coal petrography sample liquid nitrogen cycle freeze thawing
Anti-reflection simulation experiment system, including freeze thawing device, data collecting system and coal petrography sample, the freeze thawing device include frozen-thawed
Chamber and certainly supercharging liquid nitrogen container, coal petrography sample are placed in frozen-thawed chamber, provided with heating in frozen-thawed chamber
Device and liquid level sensor, heater connect temperature controller, temperature controller connection computer, liquid level by temperature controller connecting line
Sensor is connected with the liquid level display being arranged on the outside of frozen-thawed chamber, is frozen at the top of frozen-thawed chamber provided with liquid nitrogen
Melt chamber closure, frozen-thawed chamber closure is provided with safety relief valve, low-temperature pressure table and exhaust-valve, and liquid nitrogen freezes
Melt chamber bottom and liquid nitrogen container is pressurized by the connection of liquid nitrogen feeding pipe certainly；
The liquid nitrogen feeding pipe includes three-way connection, three-way connection first end connection frozen-thawed chamber bottom, three
The end of pass joint second is provided with liquid feed valve/tapping valve, and the end of three-way connection the 3rd is provided with pressure charging valve, and liquid nitrogen container is provided with from supercharging liquid nitrogen container
Stop valve, liquid nitrogen container stop valve is set by low temperature resistant connection by metal hose liquid feed valve/tapping valve on the outside of frozen-thawed chamber
There is liquid nitrogen pressure inlet, liquid nitrogen pressure inlet upper end inside frozen-thawed chamber with connecting, liquid nitrogen pressure inlet lower end connection pressure charging valve；
The data collecting system includes high-frequency pressure sensor, low temperature foil gauge and temperature sensor probe, and low temperature should
Become piece and temperature sensor probe is arranged in coal petrography sample diverse location, low temperature foil gauge is connected by deformeter connecting line
Deformeter, temperature sensor probe connects temperature sensor by temperature sensor connecting line, and deformeter and temperature sensor are equal
Computer is connected, high-frequency pressure sensor is arranged on the inside of frozen-thawed chamber, and high-frequency pressure sensor passes through USB data line
Connect computer.
Further, the frozen-thawed chamber closure side is connected by hinge with frozen-thawed chamber, liquid
Nitrogen freezing-thawing test case closure opposite side be provided with closure handle and fastening bolt, frozen-thawed chamber closure bottom surface with
Corresponding position is provided with seal groove at the top of frozen-thawed chamber.
Further, the frozen-thawed chamber contains polyurethane adiabatic layer.
The anti-reflection simulation experiment method of coal petrography sample liquid nitrogen cycle freeze thawing of the present invention：In frozen-thawed experiment, it is first turned on
Liquid feed valve/tapping valve and liquid nitrogen container stop valve, liquid nitrogen inject frozen-thawed chamber by low temperature resistant metal hose, aobvious by liquid level
Show device control injection amount of liquid nitrogen, when pressure exceedes rated pressure in freeze thawing freezing-thawing test case, safety relief valve releasing pressure automatically is protected
The security of confirmatory test, coal petrography sample freezes after certain time in liquid nitrogen, liquid feed valve/tapping valve discharge liquid nitrogen is opened, by temperature
Heated after degree controller setting melt temperature by heater, coal petrography sample starts to melt, complete a frozen-thawed circulation；With
After the circulation of above-mentioned frozen-thawed is repeated several times, investigate different liquid nitrogen freezing times, different melt temperatures, different water cut, difference
Strain to coal petrography sample and temperature affecting laws under liquid nitrogen turgor pressure and different cycle-index Variable Conditions, test data record
The Treatment Analysis in computer.
Further, different liquid nitrogen freezing times, different melt temperatures, different sample moisture content, different liquid nitrogen are being investigated
When under turgor pressure and different cycle-index Variable Conditions to strain and the temperature affecting laws of coal petrography sample, first by setting not
With liquid nitrogen freezing time, different melt temperatures, different sample moisture content, different liquid nitrogen turgor pressures and different cycle-indexes, to obtain
The coal petrography sample of anti-reflection fracturing under multiple different freeze thawing variables is taken, then each coal petrography sample is numbered, by three axles/mono-
Axle compression test and torsion shear test measure the mechanical characteristics changing rule of each coal petrography sample, pass through nuclear magnetic resonance technique, ultrasound
Wave technology, acoustic emission, electron-microscope scanning technology, the rock mass pore character of CT scan technical testing each coal petrography sample and microcosmic
Variation Regularity of Morphological Characteristics, finally by the mechanical characteristics changing rule, rock mass pore character and microscopic pattern to each coal petrography sample
Changing rule quantitative analysis, finds out optimal liquid nitrogen freezing time and melt temperature and sample moisture content and frozen-thawed circulation
Number of times is to the affecting laws during the anti-reflection coal and rock of frozen-thawed.
Further, in process of the test, in frozen-thawed chamber the liquid nitrogen bulbs of pressure by pressure charging valve, liquid nitrogen pressure inlet and
Low-temperature pressure table jointly controls, and control process is as follows：The liquid nitrogen being first turned in pressure charging valve, frozen-thawed chamber enters liquid nitrogen
Pressure inlet, liquid nitrogen pressure inlet is individual layer heat-conducting copper pipe, and liquid nitrogen rapid expansion of absorbing heat wherein is vaporizated into nitrogen, and nitrogen enters liquid nitrogen
Freezing-thawing test case, shows that pressure value jointly controls the switch of pressure charging valve, to control in frozen-thawed chamber by low-temperature pressure table
Liquid nitrogen turgor pressure, the liquid nitrogen bulbs of pressure are applied on coal petrography sample by liquid nitrogen in frozen-thawed chamber, i.e. process of the test
Confined pressure size suffered by middle coal petrography sample.
Beneficial effect：The present invention can the anti-reflection coal body of simulated solution nitrogen cycle freeze thawing or rock mass process, be liquid nitrogen circulating freezing resistance
Anti-reflection coal and rock mash gas extraction or shale gas provide a kind of achievable experiment porch, can the anti-reflection coal of quantitative study frozen-thawed
The basic parameter of rock mass, scientific basis and theoretical foundation are provided for the experiment of live frozen-thawed.
Brief description of the drawings
Fig. 1 is the anti-reflection simulation experiment system schematic diagram of coal petrography sample liquid nitrogen cycle freeze thawing；
Fig. 2 is frozen-thawed case stereogram；
Fig. 3 is the anti-reflection simulation experiment method flow chart of coal petrography sample liquid nitrogen cycle freeze thawing.
In figure：1- computers, 2- temperature controllers, 21- heaters, 22- temperature controller connecting lines, 3- high-frequency pressures
Sensor, 31-USB data wires, 4- deformeters, 41- low temperature foil gauges, 42- deformeter connecting lines, 5- temperature sensors,
51- temperature sensor probes, 52- temperature sensor connecting lines, 6- frozen-thawed chambers, 61- safety relief valves, 62-
Low-temperature pressure table, 63- exhaust-valves, 64- freeze thawing case closures, 65- seal grooves, 66- closure handles, 67- fastening spiral shells
Bolt, 68- liquid level displays, 69- liquid level sensors, 610- liquid nitrogen pressure inlets, 611- pressure charging valves, 612- three-way connections,
613- liquid feed valves/tapping valve, 7- is pressurized liquid nitrogen container, 71- liquid nitrogen container stop valves, the low temperature resistant metal hoses of 72-, 8- coals certainly
Rock sample.
Embodiment：
The present invention is done below in conjunction with the accompanying drawings and further explained.
As illustrated in fig. 1 and 2, the coal petrography anti-reflection simulation experiment system of sample liquid nitrogen cycle freeze thawing of the invention is filled including freeze thawing
Put, data collecting system and coal petrography sample 8.
The freeze thawing device includes frozen-thawed chamber 6 and from supercharging liquid nitrogen container 7, and coal petrography sample 8 is placed on liquid nitrogen jelly
Melt in chamber 6.The frozen-thawed chamber 6 contains the He of having heaters 21 in polyurethane adiabatic layer, frozen-thawed chamber 6
Liquid level sensor 69, heater 21 connects temperature controller 2, the connection computer of temperature controller 2 by temperature controller connecting line 22
1, liquid level sensor 69 is connected with being arranged on the liquid level display 68 in the outside of frozen-thawed chamber 6.
The top of frozen-thawed chamber 6 is provided with frozen-thawed chamber closure 64, frozen-thawed chamber closure 64
Safety relief valve 61, low-temperature pressure table 62 and exhaust-valve 63 are provided with, the side of frozen-thawed chamber closure 64 passes through hinge
It is connected with frozen-thawed chamber 6, the opposite side of frozen-thawed chamber closure 64 is provided with closure handle 66 and fastening bolt
67, in the bottom surface of frozen-thawed chamber closure 64, the position corresponding with the top of frozen-thawed chamber 6 is provided with seal groove 65.
Frozen-thawed chamber closure 64 is closed by fastening bolt 67, by the guarantee test environment thermal insulation of seal groove 65, works as liquid
When pressure exceedes rated pressure in nitrogen freezing-thawing test case 6, the releasing pressure automatically of safety relief valve 61, it is ensured that the security of experiment, when need
When wanting sampling with pressure, first open after the unloading nitrogen pressure of exhaust-valve 63, sample can be taken out.
The bottom of frozen-thawed chamber 6 is pressurized liquid nitrogen container 7, the liquid nitrogen feeding pipe certainly by the connection of liquid nitrogen feeding pipe
Including three-way connection 612, the bottom of the first end of three-way connection 612 connection frozen-thawed chamber 6, the end of three-way connection 612 second is set
There is liquid feed valve/tapping valve 613, the end of three-way connection 612 the 3rd is provided with pressure charging valve 611, ends from supercharging liquid nitrogen container provided with liquid nitrogen container
Valve 71, liquid nitrogen container stop valve 71 connects liquid feed valve/tapping valve 613 by low temperature resistant metal hose 72, in frozen-thawed chamber 6
Outside is provided with liquid nitrogen pressure inlet 610, and the upper end of liquid nitrogen pressure inlet 610 is connected with the inside of frozen-thawed chamber 6, liquid nitrogen pressure inlet
610 lower ends connect pressure charging valve 611.Open after pressure charging valve 611, the liquid nitrogen inside frozen-thawed chamber 6 enters liquid nitrogen pressure inlet
610 are exchanged heat with the external world and produce vaporization, and the nitrogen after vaporization enters frozen-thawed chamber 6 and implements pressurization, by low temperature pressure
Power table 62 shows that pressure value jointly controls the switch of pressure charging valve 611, to control the liquid nitrogen turgor pressure in frozen-thawed chamber 6
The liquid nitrogen bulbs of pressure are applied on coal petrography sample 8 by liquid nitrogen in power, frozen-thawed chamber 6, i.e., coal petrography sample in process of the test
Confined pressure size suffered by product 8.
The data collecting system includes high-frequency pressure sensor 3, low temperature foil gauge 41 and temperature sensor probe 51, low
Warm foil gauge 41 and temperature sensor probe 51 are arranged in the diverse location of coal petrography sample 8, and low temperature foil gauge 41 passes through strain
Instrument connecting line 42 connects deformeter 4, and temperature sensor probe 51 connects temperature sensor 5 by temperature sensor connecting line 52,
Deformeter 4 and temperature sensor 5 are all connected with computer 1, and high-frequency pressure sensor 3 is arranged in the inner side of frozen-thawed chamber 6, high
Frequency pressure sensor 3 connects computer 1 by USB data line 31.High-frequency pressure sensor 3 is used to record frozen-thawed chamber
6 internal pressures change, i.e., confined pressure change change suffered by coal petrography sample 8, deformeter 4 is used to record coal petrography sample 8 in Frozen-thawed cycled
During horizontal and vertical strain delta data, temperature sensor 5, which is used to recording the surface of coal petrography sample 8 and internal temperature, to be become
The data of change.
As shown in figure 3, the anti-reflection simulated test of coal petrography sample liquid nitrogen cycle freeze thawing of the above-mentioned pilot system of use of the present invention
Method：In frozen-thawed experiment, liquid feed valve/tapping valve 613 and liquid nitrogen container stop valve 71 are first turned on, liquid nitrogen is by low temperature resistant metal
The injection frozen-thawed of flexible pipe 72 chamber 6, is injected in amount of liquid nitrogen, process of the test, frozen-thawed by the control of liquid level display 68
The liquid nitrogen bulbs of pressure are jointly controlled by pressure charging valve 611, liquid nitrogen pressure inlet 610 and low-temperature pressure table 62 in chamber 6, control process
It is as follows：The liquid nitrogen being first turned in pressure charging valve 611, frozen-thawed chamber 6 enters liquid nitrogen pressure inlet 610, liquid nitrogen pressure inlet 610
For individual layer heat-conducting copper pipe, liquid nitrogen rapid expansion of absorbing heat wherein is vaporizated into nitrogen, and nitrogen enters frozen-thawed chamber 6, by low
Warm pressure gauge 62 shows that pressure value jointly controls the switch of pressure charging valve 611, to control the liquid nitrogen in frozen-thawed chamber 6 to expand
The liquid nitrogen bulbs of pressure are applied on coal petrography sample 8 by liquid nitrogen in pressure, frozen-thawed chamber 6, i.e., coal petrography sample in process of the test
Confined pressure size suffered by product 8.When pressure exceedes rated pressure in freeze thawing freezing-thawing test case 6, the releasing pressure automatically of safety relief valve 61 is protected
The security of confirmatory test, coal petrography sample 8 freezes after certain time in liquid nitrogen, opens the discharge liquid nitrogen of liquid feed valve/tapping valve 613,
Set after melt temperature and heated by heater 21 by temperature controller 2, coal petrography sample 8 starts to melt, completed a liquid nitrogen and freeze
Melt circulation；The circulation of above-mentioned frozen-thawed is then repeated several times, investigate under different freeze thawing Variable Conditions to the strain of coal petrography sample 8 and
Temperature affecting laws, test data record Treatment Analysis in computer 1.
When under investigating different freeze thawing Variable Conditions to strain and the temperature affecting laws of coal petrography sample 8, first by setting
Different liquid nitrogen freezing times, different melt temperatures, different water cut, different liquid nitrogen turgor pressures and different cycle-indexes are put, to obtain
Take the coal petrography sample 8 of anti-reflection fracturing under multiple different freeze thawing variables, then each coal petrography sample 8 be numbered, by three axles/
Uniaxial compression test and torsion shear test measure the mechanical characteristics changing rule of each coal petrography sample 8, by nuclear magnetic resonance technique, surpass
Technology of acoustic wave, acoustic emission, electron-microscope scanning technology, the rock mass pore character of CT scan technical testing each coal petrography sample 8 and
Microscopic pattern changing rule, finally by the mechanical characteristics changing rule of each coal petrography sample 8, rock mass pore character and microcosmic
Variation Regularity of Morphological Characteristics quantitative analysis, finds out optimal liquid nitrogen freezing time and melt temperature and the moisture content of coal petrography sample 8 and liquid
Nitrogen freezing-thawing cycles are to the affecting laws during the anti-reflection coal and rock of frozen-thawed.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (5)
1. a kind of anti-reflection simulation experiment system of coal petrography sample liquid nitrogen cycle freeze thawing, including freeze thawing device, data collecting system and coal
Rock sample product (8), it is characterised in that：The freeze thawing device includes frozen-thawed chamber (6) and certainly supercharging liquid nitrogen container (7), coal petrography
Sample (8) is placed in frozen-thawed chamber (6), and heater (21) and level sensing are provided with frozen-thawed chamber (6)
Device (69), heater (21) connects temperature controller (2) by temperature controller connecting line (22), and temperature controller (2) connection is calculated
Machine (1), liquid level sensor (69) is connected with the liquid level display (68) being arranged on the outside of frozen-thawed chamber (6), and liquid nitrogen freezes
Melt and frozen-thawed chamber closure (64) is provided with the top of chamber (6), frozen-thawed chamber closure (64) is provided with peace
Full relief valve (61), low-temperature pressure table (62) and exhaust-valve (63), frozen-thawed chamber (6) bottom passes through liquid nitrogen feeding pipe
Connection is pressurized liquid nitrogen container (7) certainly；
The liquid nitrogen feeding pipe includes three-way connection (612), the connection frozen-thawed chamber of three-way connection (612) first end
(6) bottom, the end of three-way connection (612) second is provided with liquid feed valve/tapping valve (613), and the end of three-way connection (612) the 3rd is provided with supercharging
Valve (611), is provided with liquid nitrogen container stop valve (71), liquid nitrogen container stop valve (71) passes through low temperature resistant metal hose from supercharging liquid nitrogen container
(72) connection liquid feed valve/tapping valve (613), is provided with liquid nitrogen pressure inlet (610) on the outside of frozen-thawed chamber (6), and liquid nitrogen increases
Pressure pipe (610) upper end inside frozen-thawed chamber (6) with connecting, liquid nitrogen pressure inlet (610) lower end connection pressure charging valve (611)；
The data collecting system includes high-frequency pressure sensor (3), low temperature foil gauge (41) and temperature sensor probe (51),
Low temperature foil gauge (41) and temperature sensor probe (51) are arranged in coal petrography sample (8) diverse location, low temperature foil gauge
(41) deformeter (4) is connected by deformeter connecting line (42), temperature sensor probe (51) passes through temperature sensor connecting line
(52) connection temperature sensor (5), deformeter (4) and temperature sensor (5) are all connected with computer (1), high-frequency pressure sensor
(3) it is arranged on the inside of frozen-thawed chamber (6), high-frequency pressure sensor (3) connects computer by USB data line (31)
(1)；
Frozen-thawed chamber closure (64) side is connected by hinge with frozen-thawed chamber (6), frozen-thawed
Chamber closure (64) opposite side is provided with closure handle (66) and fastening bolt (67), in frozen-thawed chamber closure
(64) the bottom surface position corresponding with the top of frozen-thawed chamber (6) is provided with seal groove (65).
2. a kind of anti-reflection simulation experiment system of coal petrography sample liquid nitrogen cycle freeze thawing according to claim 1, it is characterised in that：
The frozen-thawed chamber (6) contains polyurethane adiabatic layer.
3. the anti-reflection simulation experiment method of coal petrography sample liquid nitrogen cycle freeze thawing of pilot system as claimed in claim 1 or 2 is used, its
It is characterised by：In frozen-thawed experiment, liquid feed valve/tapping valve (613) and liquid nitrogen container stop valve (71) are first turned on, liquid nitrogen is by resistance to
Cryogenic metal hose (72) injection frozen-thawed chamber (6), by liquid level display (68) control injection amount of liquid nitrogen, works as freeze thawing
When freezing-thawing test case (6) interior pressure exceedes rated pressure, safety relief valve (61) releasing pressure automatically, it is ensured that the security of experiment, coal
Rock sample product (8) freeze after certain time in liquid nitrogen, liquid feed valve/tapping valve (613) discharge liquid nitrogen are opened, by temperature controller
(2) heated after setting melt temperature by heater (21), coal petrography sample (8) starts to melt, complete a frozen-thawed circulation；
The circulation of above-mentioned frozen-thawed is then repeated several times, different liquid nitrogen freezing times, different melt temperatures, different water cut, no is investigated
With the strain under liquid nitrogen turgor pressure and different cycle-index Variable Conditions to coal petrography sample (8) and temperature affecting laws, number is tested
According to record in computer (1) interior Treatment Analysis.
4. the anti-reflection simulation experiment method of coal petrography sample liquid nitrogen cycle freeze thawing according to claim 3, it is characterised in that：Examining
Different liquid nitrogen freezing times, different melt temperatures, different sample moisture content, different liquid nitrogen turgor pressures and different cycle-indexes is examined to become
When under the conditions of amount to strain and the temperature affecting laws of coal petrography sample (8), first by setting different liquid nitrogen freezing times, difference
Melt temperature, different sample moisture content, different liquid nitrogen turgor pressures and different cycle-indexes, to obtain under multiple different freeze thawing variables
The coal petrography sample (8) of anti-reflection fracturing, is then numbered each coal petrography sample (8), passes through three axles/uniaxial compression test and torsion
Scissor test measures the mechanical characteristics changing rule of each coal petrography sample (8), is sent out by nuclear magnetic resonance technique, ultrasonic technology, sound
Penetrate rock mass pore character and the microscopic pattern change of technology, electron-microscope scanning technology, CT scan technical testing each coal petrography sample (8)
Rule, changes finally by mechanical characteristics changing rule, rock mass pore character and microscopic pattern to each coal petrography sample (8) and advises
Quantitative analysis is restrained, optimal liquid nitrogen freezing time and melt temperature and sample moisture content and frozen-thawed cycle-index pair is found out
Affecting laws during coal and rock that frozen-thawed is anti-reflection.
5. the anti-reflection simulation experiment method of coal petrography sample liquid nitrogen cycle freeze thawing according to claim 4, it is characterised in that：Experiment
During, the interior liquid nitrogen bulbs of pressure of frozen-thawed chamber (6) are by pressure charging valve (611), liquid nitrogen pressure inlet (610) and low-temperature pressure
Table (62) jointly controls, and control process is as follows：The liquid nitrogen being first turned in pressure charging valve (611), frozen-thawed chamber (6) enters
Liquid nitrogen pressure inlet (610), liquid nitrogen pressure inlet (610) is individual layer heat-conducting copper pipe, and liquid nitrogen rapid expansion of absorbing heat wherein is vaporizated into nitrogen
Gas, nitrogen enters frozen-thawed chamber (6), shows that pressure value jointly controls pressure charging valve (611) by low-temperature pressure table (62)
Switch, to control the liquid nitrogen turgor pressure in frozen-thawed chamber (6), the interior liquid nitrogen bulbs of pressure of frozen-thawed chamber (6) are led to
Cross liquid nitrogen to be applied on coal petrography sample (8), i.e., confined pressure size suffered by coal petrography sample (8) in process of the test.
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| CN201510444636.XA CN105136837B (en) | 2015-07-24 | 2015-07-24 | Liquid nitrogen circulating freeze-thawing permeability-increasing simulation test system and method for coal rock sample |
| AU2015403840A AU2015403840B2 (en) | 2015-07-24 | 2015-12-29 | Test system and method for liquid nitrogen circle freeze-thawing permeability-increasing simulation of coal rock sample |
| PCT/CN2015/099319 WO2017016168A1 (en) | 2015-07-24 | 2015-12-29 | Test system and method for liquid nitrogen circle freeze-thawing permeability-increasing simulation of coal rock sample |
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| CN201510444636.XA CN105136837B (en) | 2015-07-24 | 2015-07-24 | Liquid nitrogen circulating freeze-thawing permeability-increasing simulation test system and method for coal rock sample |
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| CN105136837B (en) * | 2015-07-24 | 2017-08-29 | 中国矿业大学 | Liquid nitrogen circulating freeze-thawing permeability-increasing simulation test system and method for coal rock sample |
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| AU2015403840A1 (en) | 2017-03-16 |
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