CN105136837A - Test system and test method of liquid nitrogen circulation freeze-thawing permeability-increasing simulation of coal rock sample - Google Patents

Test system and test method of liquid nitrogen circulation freeze-thawing permeability-increasing simulation of coal rock sample Download PDF

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Publication number
CN105136837A
CN105136837A CN201510444636.XA CN201510444636A CN105136837A CN 105136837 A CN105136837 A CN 105136837A CN 201510444636 A CN201510444636 A CN 201510444636A CN 105136837 A CN105136837 A CN 105136837A
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China
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liquid nitrogen
frozen
thawed
test
coal petrography
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CN201510444636.XA
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Chinese (zh)
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CN105136837B (en
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翟成
秦雷
徐吉钊
汤宗情
武世亮
仲超
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中国矿业大学
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00Investigating or analyzing materials by the use of thermal means

Abstract

The invention discloses a test system and a test method of liquid nitrogen circulation freeze-thawing permeability-increasing simulation of a coal rock sample. The test system includes a freeze-thawing device, a data collection system and the coal rock sample. The freeze-thawing device includes a liquid nitrogen freeze-thawing test box and a self-pressurizing liquid nitrogen pot. The coal rock sample is disposed in the liquid nitrogen freeze-thawing test box, which is connected to the self-pressurizing liquid nitrogen pot through a liquid nitrogen supply pipeline. The liquid nitrogen supply pipeline includes a three-way joint, which is respectively connected to the liquid nitrogen freeze-thawing test box, the self-pressurizing liquid nitrogen pot and a liquid nitrogen pressurizing tube. The data collection system includes a high-frequency pressure sensor, a low-temperature strain sheet and a temperature sensor probe. The test method includes the step of carrying out a liquid nitrogen freeze-thawing circulation for several times to research a principle of influences on strain and temperature to the coal rock sample under different freeze-thawing variable conditions. The test system and the test method can simulate a process of permeability increase of coal body or rock body through liquid nitrogen circulation freeze thawing and provides an available test platform to gas or shale gas extraction from coal rock body with permeability increase by the liquid nitrogen circulation freeze thawing.

Description

A kind of coal petrography sample liquid anti-reflection simulation experiment system of nitrogen cycle freeze thawing and method
Technical field
The present invention relates to a kind of freezing-thawing test system and method, the anti-reflection simulation experiment system of especially a kind of coal petrography sample liquid nitrogen cycle freeze thawing and method.
Background technology
According to statistics, China's gassy mine and about 30% of the national mine total quantity that had the mine of Gas Outburst danger to account for, and weigh, the high occurrence frequency of especially big pernicious gas accident do not obtain the solution of essence, this will seriously hamper carrying out smoothly of following China's coal-mine safety in production.Therefore, coal mine gas drainage work, imperative.But China coal seam mostly is high gassy and low permeability coal seam, gas pumping difficulty is large, and gas extraction concentration is lower, and major part is lower than 20%.Adopt the methods such as waterfrac treatment, hydraulic slotted liner technique and presplitting blasting to increase gas permeability of coal seam at present more, along with the continuous increase of the mine degree of depth and mining rate, the anti-reflection scope of conventional coal seam anti-reflection mash gas extraction method fracturing is little, coal body cannot form gas pumping fracture network on a large scale, make gas pumping rate low, gas control effect is undesirable.Proposing a kind of efficient anti-reflection gas drainage from coal seam method is accelerate to crack the emphasis of deep coal mining diaster prevention and control.
Freeze thawing phenomenon is a kind of common physico-geological function of occurring in nature and phenomenon, especially appears in the larger object configurations of difference variation, as highway and the buildings of Qinghai-Tibet Platean, northern area.Freeze-thaw erosion is because the moisture in soil and matrix hole thereof or in rock fracture is when freezing, volumetric expansion, crack is strengthened thereupon, increase the caused monoblock soil body or rock chipping, after melting, its corrosion stability greatly reduces, and produces the phenomenon of displacement under gravity below ground inclined slope aspect.The alternately appearance freezed and melt of structural member surface and inner contained humidity, is called Frozen-thawed cycled.The appearance repeatedly of Frozen-thawed cycled, causes the havoc of object configurations.
At ambient pressure, liquid nitrogen temperature can reach-196 DEG C, and the latent heat of vaporization is 5.56kJ/mol, 1m 3liquid nitrogen can be expanded to 21 DEG C of pure gaseous nitrogens of 696m3, amount of heat around Absorbable rod during vaporization.Liquid nitrogen has the advantages such as preparation is simple, raw material sources are extensive, and in coal body Frozen-thawed cycled, liquid nitrogen can be used as a kind of refrigeration and anti-reflection medium efficiently.
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, for high gas layer provides one coal seam anti-reflection method more efficiently, propose a kind of based on the anti-reflection gas drainage from coal seam method of horizontal orientation boring liquid nitrogen circulating freezing resistance, coal body is under aqueous phase becomes frost-heave force, liquid nitrogen gasification bulging force and the acting in conjunction of micropore liquid flow osmotic pressure, impel macroscopical crack and micro-crack expansion UNICOM in low permeability coal seam, link up gas pumping fracture network, increase gas permeability of coal seam.Because the anti-reflection gas drainage from coal seam method of liquid nitrogen circulating freezing resistance is by many factors, the research of various influence factor to the anti-reflection rule of coal and rock how is carried out in laboratory, for the anti-reflection gas drainage from coal seam engineer applied of liquid nitrogen circulating freezing resistance provides scientific basis and theoretical foundation, and determine that the optimum value of each variation is problem in science urgently to be resolved hurrily at present.
Summary of the invention
Goal of the invention: the object of this invention is to provide the anti-reflection simulation experiment system of a kind of coal petrography sample liquid nitrogen cycle freeze thawing and method, the engineer applied be intended to 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: the anti-reflection simulation experiment system of a kind of coal petrography sample liquid nitrogen cycle freeze thawing, comprise freeze thawing device, data acquisition system (DAS) and coal petrography sample, described freeze thawing device comprises frozen-thawed chamber and from supercharging liquid nitrogen container, coal petrography sample is placed in frozen-thawed chamber, well heater and liquid level sensor is provided with in frozen-thawed chamber, well heater connects temperature controller by temperature controller connecting line, temperature controller connects computing machine, liquid level sensor is connected with the liquid level display be arranged on outside frozen-thawed chamber, frozen-thawed chamber top is provided with frozen-thawed chamber gland bonnet, frozen-thawed chamber gland bonnet is provided with safety relief valve, low-temperature pressure table and exhaust-valve, connected from supercharging liquid nitrogen container by liquid nitrogen feeding pipe bottom frozen-thawed chamber,
Described liquid nitrogen feeding pipe comprises three-way connection, three-way connection first end connects bottom liquid nitrogen freezing-thawing test case, three-way connection second end is provided with liquid feed valve/tapping valve, three-way connection the 3rd end is provided with pressure charging valve, liquid nitrogen container stop valve is provided with from supercharging liquid nitrogen container, liquid nitrogen container stop valve is by low temperature resistant connection by metal hose liquid feed valve/tapping valve, liquid nitrogen ascending pipe is provided with outside frozen-thawed chamber, liquid nitrogen ascending pipe upper end is communicated with frozen-thawed chamber inside, and liquid nitrogen ascending pipe lower end connects pressure charging valve;
Described data acquisition system (DAS) comprises high-frequency pressure sensor, low temperature foil gauge and temperature sensor probe, low temperature foil gauge and temperature sensor probe are arranged in coal petrography sample diverse location, low temperature foil gauge connects strainmeter by strainmeter connecting line, temperature sensor probe connects temperature sensor by temperature sensor connecting line, strainmeter is all connected computing machine with temperature sensor, high-frequency pressure sensor is arranged in inside frozen-thawed chamber, and high-frequency pressure sensor connects computing machine by USB data line.
Further, described frozen-thawed chamber gland bonnet side is connected with frozen-thawed chamber by hinge, frozen-thawed chamber gland bonnet opposite side is provided with gland bonnet handle and fastening bolt, and the position corresponding with frozen-thawed chamber top in frozen-thawed chamber gland bonnet bottom surface is provided with seal groove.
Further, described 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 test, first liquid feed valve/tapping valve and liquid nitrogen container stop valve is opened, liquid nitrogen injects liquid nitrogen freezing-thawing test case by low temperature resistant metal hose, injection liquid nitrogen quantity is controlled by liquid level display, when in freeze thawing freezing-thawing test case, pressure exceedes rated pressure, safety relief valve releasing pressure automatically, the security of warranty test, after coal petrography sample freezes certain hour in liquid nitrogen, open liquid feed valve/tapping valve and discharge liquid nitrogen, heat through well heater after setting melt temperature by temperature controller, coal petrography sample starts to melt, complete a frozen-thawed circulation, repeatedly repeat the circulation of above-mentioned frozen-thawed subsequently, investigate to the strain of coal petrography sample and temperature affecting laws under different freeze thawing Variable Conditions, test figure is recorded in Treatment Analysis in computing machine.
Further, time under the different freeze thawing Variable Conditions of investigation to the strain of coal petrography sample and temperature affecting laws, first by arranging the different liquid nitrogen freezing time, different melt temperature, different sample water percentage, different liquid nitrogen turgor pressures and different cycle index, to obtain the coal petrography sample of anti-reflection fracturing under multiple different freeze thawing variable, then each coal petrography sample is numbered, the mechanical characteristics Changing Pattern of each coal petrography sample is recorded by three axles/uniaxial compression test and torsion shear test, pass through nuclear magnetic resonance technique, ultrasonic technology, acoustic emission, electron-microscope scanning technology, the rock mass pore character of each coal petrography sample of CT scan technical testing and microscopic pattern Changing Pattern, finally by the mechanical characteristics Changing Pattern to each coal petrography sample, rock mass pore character and the quantitative test of microscopic pattern Changing Pattern, find out best liquid nitrogen freezing time and melt temperature and sample water percentage and frozen-thawed cycle index to the affecting laws in the anti-reflection coal and rock process of frozen-thawed.
Further, in process of the test, in frozen-thawed chamber, the liquid nitrogen swelling pressure are by pressure charging valve, liquid nitrogen ascending pipe and low-temperature pressure table jointly control, control procedure is as follows: first open pressure charging valve, liquid nitrogen in frozen-thawed chamber enters liquid nitrogen ascending pipe, liquid nitrogen ascending pipe is individual layer heat-conducting copper pipe, liquid nitrogen rapid expansion of absorbing heat wherein is vaporizated into nitrogen, nitrogen enters frozen-thawed chamber, the switch that force value jointly controls pressure charging valve is shown by low-temperature pressure table, control the liquid nitrogen turgor pressure in frozen-thawed chamber, in frozen-thawed chamber, the liquid nitrogen swelling pressure are applied on coal petrography sample by liquid nitrogen, i.e. confined pressure size suffered by coal petrography sample in process of the test.
Beneficial effect: the present invention can the process of the anti-reflection coal body of simulated solution nitrogen cycle freeze thawing or rock mass, for liquid nitrogen circulating freezing resistance anti-reflection coal and rock mash gas extraction or shale gas provide a kind of attainable experiment porch, can the basic parameter of the anti-reflection coal and rock of quantitative examination frozen-thawed, for on-the-spot frozen-thawed experiment provides scientific basis and theoretical foundation.
Accompanying drawing explanation
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 stereographic map;
Fig. 3 is the anti-reflection simulation experiment method process flow diagram of coal petrography sample liquid nitrogen cycle freeze thawing.
In figure: 1-computing machine, 2-temperature controller, 21-well heater, 22-temperature controller connecting line, 3-high-frequency pressure sensor, 31-USB data line, 4-strainmeter, 41-low temperature foil gauge, 42-strainmeter connecting line, 5-temperature sensor, 51-temperature sensor probe, 52-temperature sensor connecting line, the chamber of 6-frozen-thawed, 61-safety relief valve, 62-low-temperature pressure table, 63-exhaust-valve, 64-freeze thawing case gland bonnet, 65-seal groove, 66-gland bonnet handle, 67-fastening bolt, 68-liquid level display, 69-liquid level sensor, 610-liquid nitrogen ascending pipe, 611-pressure charging valve, 612-three-way connection, 613-liquid feed valve/tapping valve, 7-is from supercharging liquid nitrogen container, 71-liquid nitrogen container stop valve, the low temperature resistant metal hose of 72-, 8-coal petrography sample.
Embodiment:
Below in conjunction with accompanying drawing the present invention done and further explain.
As illustrated in fig. 1 and 2, the anti-reflection simulation experiment system of coal petrography sample liquid nitrogen cycle freeze thawing of the present invention comprises freeze thawing device, data acquisition system (DAS) and coal petrography sample 8.
Described freeze thawing device comprises frozen-thawed chamber 6 and from supercharging liquid nitrogen container 7, coal petrography sample 8 is placed in frozen-thawed chamber 6.Described frozen-thawed chamber 6 is containing polyurethane adiabatic layer, having heaters 21 and liquid level sensor 69 in frozen-thawed chamber 6, well heater 21 connects temperature controller 2 by temperature controller connecting line 22, temperature controller 2 connects computing machine 1, and liquid level sensor 69 is connected with the liquid level display 68 be arranged on outside frozen-thawed chamber 6.
Frozen-thawed chamber 6 top is provided with frozen-thawed chamber gland bonnet 64, frozen-thawed chamber gland bonnet 64 is provided with safety relief valve 61, low-temperature pressure table 62 and exhaust-valve 63, frozen-thawed chamber gland bonnet 64 side is connected with frozen-thawed chamber 6 by hinge, frozen-thawed chamber gland bonnet 64 opposite side is provided with gland bonnet handle 66 and fastening bolt 67, and the position corresponding with frozen-thawed chamber 6 top in frozen-thawed chamber gland bonnet 64 bottom surface is provided with seal groove 65.Frozen-thawed chamber gland bonnet 64 is closed by fastening bolt 67, by seal groove 65 warranty test environment thermal insulation, when in frozen-thawed chamber 6, pressure exceedes rated pressure, safety relief valve 61 releasing pressure automatically, the security of warranty test, when needs sampling with pressure, first open after exhaust-valve 63 unloads nitrogen pressure, can sample be taken out.
Connected from supercharging liquid nitrogen container 7 by liquid nitrogen feeding pipe bottom frozen-thawed chamber 6, described liquid nitrogen feeding pipe comprises three-way connection 612, three-way connection 612 first end connects bottom liquid nitrogen freezing-thawing test case 6, three-way connection 612 second end is provided with liquid feed valve/tapping valve 613, three-way connection 612 the 3rd end is provided with pressure charging valve 611, liquid nitrogen container stop valve 71 is provided with from supercharging liquid nitrogen container, liquid nitrogen container stop valve 71 connects liquid feed valve/tapping valve 613 by low temperature resistant metal hose 72, liquid nitrogen ascending pipe 610 is provided with outside frozen-thawed chamber 6, liquid nitrogen ascending pipe 610 upper end is communicated with frozen-thawed chamber 6 inside, liquid nitrogen ascending pipe 610 lower end connects pressure charging valve 611.After opening pressure charging valve 611, the liquid nitrogen of frozen-thawed chamber 6 inside enters liquid nitrogen ascending pipe 610 to carry out heat exchange with the external world and produces vaporization, nitrogen after vaporization enters frozen-thawed chamber 6 and implements pressurization, the switch that force value jointly controls pressure charging valve 611 is shown by low-temperature pressure table 62, control the liquid nitrogen swelling pressure in frozen-thawed chamber 6, in frozen-thawed chamber 6, the liquid nitrogen swelling pressure are applied on coal petrography sample 8 by liquid nitrogen, i.e. confined pressure size suffered by coal petrography sample 8 in process of the test.
Described data acquisition system (DAS) comprises 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 connects strainmeter 4 by strainmeter connecting line 42, temperature sensor probe 51 connects temperature sensor 5 by temperature sensor connecting line 52, strainmeter 4 is all connected computing machine 1 with temperature sensor 5, high-frequency pressure sensor 3 is arranged in inside frozen-thawed chamber 6, and high-frequency pressure sensor 3 connects computing machine 1 by USB data line 31.High-frequency pressure sensor 3 is for recording the change of frozen-thawed chamber 6 internal pressure, i.e. confined pressure change change suffered by coal petrography sample 8, strainmeter 4 is for recording the delta data of the horizontal and vertical strain of coal petrography sample 8 in Frozen-thawed cycled process, and temperature sensor 5 is for recording the data of coal petrography sample 8 surface and internal temperature change.
As shown in Figure 3, the anti-reflection simulation experiment method of coal petrography sample liquid nitrogen cycle freeze thawing of the above-mentioned pilot system of employing of the present invention: in frozen-thawed test, first liquid feed valve/tapping valve 613 and liquid nitrogen container stop valve 71 is opened, liquid nitrogen injects liquid nitrogen freezing-thawing test case 6 by low temperature resistant metal hose 72, injection liquid nitrogen quantity is controlled by liquid level display 68, in process of the test, in frozen-thawed chamber 6, the liquid nitrogen swelling pressure are by pressure charging valve 611, liquid nitrogen ascending pipe 610 and low-temperature pressure table 62 jointly control, control procedure is as follows: first open pressure charging valve 611, liquid nitrogen in frozen-thawed chamber 6 enters liquid nitrogen ascending pipe 610, liquid nitrogen ascending pipe 610 is individual layer heat-conducting copper pipe, liquid nitrogen rapid expansion of absorbing heat wherein is vaporizated into nitrogen, nitrogen enters frozen-thawed chamber 6, the switch that force value jointly controls pressure charging valve 611 is shown by low-temperature pressure table 62, control the liquid nitrogen turgor pressure in frozen-thawed chamber 6, in frozen-thawed chamber 6, the liquid nitrogen swelling pressure are applied on coal petrography sample 8 by liquid nitrogen, i.e. confined pressure size suffered by coal petrography sample 8 in process of the test.When in freeze thawing freezing-thawing test case 6, pressure exceedes rated pressure, safety relief valve 61 releasing pressure automatically, the security of warranty test, after coal petrography sample 8 freezes certain hour in liquid nitrogen, open liquid feed valve/tapping valve 613 and discharge liquid nitrogen, heat through well heater 21 after setting melt temperature by temperature controller 2, coal petrography sample 8 starts to melt, and completes a frozen-thawed circulation; Repeatedly repeat the circulation of above-mentioned frozen-thawed subsequently, investigate to the strain of coal petrography sample 8 and temperature affecting laws under different freeze thawing Variable Conditions, test figure is recorded in Treatment Analysis in computing machine 1.
Time under the different freeze thawing Variable Conditions of investigation to the strain of coal petrography sample 8 and temperature affecting laws, first by arranging the different liquid nitrogen freezing time, different melt temperature, different water cut, different liquid nitrogen turgor pressures and different cycle index, to obtain the coal petrography sample 8 of anti-reflection fracturing under multiple different freeze thawing variable, then each coal petrography sample 8 is numbered, the mechanical characteristics Changing Pattern of each coal petrography sample 8 is recorded by three axles/uniaxial compression test and torsion shear test, pass through nuclear magnetic resonance technique, ultrasonic technology, acoustic emission, electron-microscope scanning technology, the rock mass pore character of each coal petrography sample 8 of CT scan technical testing and microscopic pattern Changing Pattern, finally by the mechanical characteristics Changing Pattern to each coal petrography sample 8, rock mass pore character and the quantitative test of microscopic pattern Changing Pattern, find out best liquid nitrogen freezing time and melt temperature and coal petrography sample 8 water percentage and frozen-thawed cycle index to the affecting laws in the anti-reflection coal and rock process of frozen-thawed.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (6)

1. the anti-reflection simulation experiment system of coal petrography sample liquid nitrogen cycle freeze thawing, comprise freeze thawing device, data acquisition system (DAS) and coal petrography sample (8), it is characterized in that: described freeze thawing device comprises frozen-thawed chamber (6) and from supercharging liquid nitrogen container (7), coal petrography sample (8) is placed in frozen-thawed chamber (6), well heater (21) and liquid level sensor (69) is provided with in frozen-thawed chamber (6), well heater (21) connects temperature controller (2) by temperature controller connecting line (22), temperature controller (2) connects computing machine (1), liquid level sensor (69) is connected with the liquid level display (68) being arranged on frozen-thawed chamber (6) outside, frozen-thawed chamber (6) top is provided with frozen-thawed chamber gland bonnet (64), frozen-thawed chamber gland bonnet (64) is provided with safety relief valve (61), low-temperature pressure table (62) and exhaust-valve (63), frozen-thawed chamber (6) bottom is connected from supercharging liquid nitrogen container (7) by liquid nitrogen feeding pipe,
Described liquid nitrogen feeding pipe comprises three-way connection (612), three-way connection (612) first end connects liquid nitrogen freezing-thawing test case (6) bottom, three-way connection (612) second end is provided with liquid feed valve/tapping valve (613), three-way connection (612) the 3rd end is provided with pressure charging valve (611), liquid nitrogen container stop valve (71) is provided with from supercharging liquid nitrogen container, liquid nitrogen container stop valve (71) connects liquid feed valve/tapping valve (613) by low temperature resistant metal hose (72), liquid nitrogen ascending pipe (610) is provided with in frozen-thawed chamber (6) outside, liquid nitrogen ascending pipe (610) upper end is communicated with frozen-thawed chamber (6) inside, liquid nitrogen ascending pipe (610) lower end connects pressure charging valve (611),
Described data acquisition system (DAS) comprises 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) connects strainmeter (4) by strainmeter connecting line (42), temperature sensor probe (51) connects temperature sensor (5) by temperature sensor connecting line (52), strainmeter (4) is all connected computing machine (1) with temperature sensor (5), high-frequency pressure sensor (3) is arranged in frozen-thawed chamber (6) inner side, high-frequency pressure sensor (3) connects computing machine (1) by USB data line (31).
2. the anti-reflection simulation experiment system of a kind of coal petrography sample liquid nitrogen cycle freeze thawing according to claim 1, it is characterized in that: described frozen-thawed chamber gland bonnet (64) side is connected with frozen-thawed chamber (6) by hinge, frozen-thawed chamber gland bonnet (64) opposite side is provided with gland bonnet handle (66) and fastening bolt (67), is provided with seal groove (65) in the position that frozen-thawed chamber gland bonnet (64) bottom surface is corresponding with frozen-thawed chamber (6) top.
3. the anti-reflection simulation experiment system of a kind of coal petrography sample liquid nitrogen cycle freeze thawing according to claim 1, is characterized in that: described frozen-thawed chamber (6) is containing polyurethane adiabatic layer.
4. according to the anti-reflection simulation experiment method of coal petrography sample liquid nitrogen cycle freeze thawing of pilot system described in any one in claims 1 to 3 item, it is characterized in that: in frozen-thawed test, first liquid feed valve/tapping valve (613) and liquid nitrogen container stop valve (71) is opened, liquid nitrogen injects liquid nitrogen freezing-thawing test case (6) by low temperature resistant metal hose (72), injection liquid nitrogen quantity is controlled by liquid level display (68), when in freeze thawing freezing-thawing test case (6), pressure exceedes rated pressure, safety relief valve (61) releasing pressure automatically, the security of warranty test, after coal petrography sample (8) freezes certain hour in liquid nitrogen, open liquid feed valve/tapping valve (613) and discharge liquid nitrogen, heat through well heater (21) after setting melt temperature by temperature controller (2), coal petrography sample (8) starts to melt, complete a frozen-thawed circulation, repeatedly repeat the circulation of above-mentioned frozen-thawed subsequently, investigate to the strain of coal petrography sample (8) and temperature affecting laws under different freeze thawing Variable Conditions, test figure is recorded in computing machine (1) interior Treatment Analysis.
5. the anti-reflection simulation experiment method of coal petrography sample liquid nitrogen cycle freeze thawing according to claim 4, it is characterized in that: time under the different freeze thawing Variable Conditions of investigation to the strain of coal petrography sample (8) and temperature affecting laws, first by arranging the different liquid nitrogen freezing time, different melt temperature, different sample water percentage, different liquid nitrogen turgor pressures and different cycle index, to obtain the coal petrography sample (8) of anti-reflection fracturing under multiple different freeze thawing variable, then each coal petrography sample (8) is numbered, the mechanical characteristics Changing Pattern of each coal petrography sample (8) is recorded by three axles/uniaxial compression test and torsion shear test, pass through nuclear magnetic resonance technique, ultrasonic technology, acoustic emission, electron-microscope scanning technology, the rock mass pore character of each coal petrography sample (8) of CT scan technical testing and microscopic pattern Changing Pattern, finally by the mechanical characteristics Changing Pattern to each coal petrography sample (8), rock mass pore character and the quantitative test of microscopic pattern Changing Pattern, find out best liquid nitrogen freezing time and melt temperature and sample water percentage and frozen-thawed cycle index to the affecting laws in the anti-reflection coal and rock process of frozen-thawed.
6. the anti-reflection simulation experiment method of coal petrography sample liquid nitrogen cycle freeze thawing according to claim 5, it is characterized in that: in process of the test, the interior liquid nitrogen swelling pressure of frozen-thawed chamber (6) are by pressure charging valve (611), liquid nitrogen ascending pipe (610) and low-temperature pressure table (62) jointly control, control procedure is as follows: first open pressure charging valve (611), liquid nitrogen in frozen-thawed chamber (6) enters liquid nitrogen ascending pipe (610), liquid nitrogen ascending pipe (610) is individual layer heat-conducting copper pipe, liquid nitrogen rapid expansion of absorbing heat wherein is vaporizated into nitrogen, nitrogen enters frozen-thawed chamber (6), the switch that force value jointly controls pressure charging valve (611) is shown by low-temperature pressure table (62), control the liquid nitrogen turgor pressure in frozen-thawed chamber (6), the interior liquid nitrogen swelling pressure of frozen-thawed chamber (6) are applied on coal petrography sample (8) by liquid nitrogen, the i.e. suffered confined pressure size of coal petrography sample (8) in process of the test.
CN201510444636.XA 2015-07-24 2015-07-24 A kind of anti-reflection simulation experiment system of coal petrography sample liquid nitrogen cycle freeze thawing and method CN105136837B (en)

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WO2017016168A1 (en) * 2015-07-24 2017-02-02 中国矿业大学 Test system and method for liquid nitrogen circle freeze-thawing permeability-increasing simulation of coal rock sample
CN106645627A (en) * 2016-09-21 2017-05-10 中国矿业大学(北京) Strain measurement method for water-absorption free expansion of coal rocks
CN106680129A (en) * 2017-02-24 2017-05-17 新华水力发电有限公司 Dry-wet-freeze-thaw cycle environment simulation and damage and deterioration test device and method for rock sample
CN106770418A (en) * 2017-03-17 2017-05-31 西安科技大学 The device and method of Rock And Soil internal moisture migration in real-time monitoring frozen-thaw process
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CN108051477A (en) * 2017-12-28 2018-05-18 核工业北京地质研究院 The measuring method of rock transverse direction thermal conductivity factor under a kind of Uniaxial Compression
CN108333053A (en) * 2018-02-01 2018-07-27 石家庄铁道大学 A kind of rock Frozen-thawed cycled equipment that can apply axial compressive force
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