CN109406372B - Test experiment device and method for liquid nitrogen seepage migration characteristics of loose medium - Google Patents
Test experiment device and method for liquid nitrogen seepage migration characteristics of loose medium Download PDFInfo
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- CN109406372B CN109406372B CN201811541100.XA CN201811541100A CN109406372B CN 109406372 B CN109406372 B CN 109406372B CN 201811541100 A CN201811541100 A CN 201811541100A CN 109406372 B CN109406372 B CN 109406372B
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 299
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 149
- 239000007788 liquid Substances 0.000 title claims abstract description 124
- 238000002474 experimental method Methods 0.000 title claims abstract description 66
- 238000013508 migration Methods 0.000 title claims abstract description 32
- 230000005012 migration Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000012360 testing method Methods 0.000 title claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 43
- 238000002347 injection Methods 0.000 claims abstract description 38
- 239000007924 injection Substances 0.000 claims abstract description 38
- 238000009834 vaporization Methods 0.000 claims abstract description 24
- 230000008016 vaporization Effects 0.000 claims abstract description 24
- 239000003245 coal Substances 0.000 claims abstract description 20
- 230000010365 information processing Effects 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 6
- 230000008859 change Effects 0.000 claims description 11
- 238000009529 body temperature measurement Methods 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000009792 diffusion process Methods 0.000 claims description 5
- 238000007781 pre-processing Methods 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims 4
- 238000012512 characterization method Methods 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000002269 spontaneous effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000011261 inert gas Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses a loose medium liquid nitrogen seepage migration characteristic test experiment device and method, which make up for the blank of the prior art; filling loose media with different particle sizes in an experiment box; the side surface of the experimental box is provided with a liquid nitrogen injection port and a differential pressure temperature measuring port; a differential pressure temperature measuring port is provided with a differential pressure meter and a temperature meter; the liquid nitrogen injection system is extended into the liquid nitrogen injection port through the liquid nitrogen conveying pipe so as to realize liquid nitrogen injection into the experiment box; a plurality of temperature sensors are arranged on a set area at the bottom of the experiment box; a gas release port is formed in the top of the experiment box, and a gas mass flowmeter is arranged at the gas release port; the gas mass flowmeter, the differential pressure meter, the temperature measuring meter and all the temperature sensors are connected with the data acquisition instrument, and the data acquisition instrument is connected with the information processing terminal. The device is used for measuring the liquid nitrogen migration path, the complete vaporization radius and the vaporization rate in the loose medium of the coal mine goaf.
Description
Technical Field
The invention relates to the technical field of liquid nitrogen seepage migration characteristic test, in particular to a loose medium liquid nitrogen seepage migration characteristic test experimental device and method.
Background
When spontaneous combustion of the goaf of the coal mine occurs, the goaf of the coal mine is influenced by the working space of the working face of the coal mine and the monitoring means, and accurate detection of the deep high-temperature spontaneous combustion point of the goaf of the coal mine cannot be realized at present. The method for treating spontaneous combustion of the coal mine goaf mainly used at home and abroad at present comprises the following steps: the technology plays an important role in controlling spontaneous combustion of coal, such as water injection grouting, inert gas, pressure equalizing fire prevention and extinguishment, gel fire extinguishment, foam fire extinguishment and the like, but other fire area control methods except the inert gas are difficult to directly act on a fire area due to difficult judgment of the spontaneous combustion point position of a goaf of a coal mine. However, inert gas is easy to act on a high Wen Fahuo area and easy to diffuse and run off due to good fluidity and diffusivity, so that choking effect generated by injecting inert gas and heat taken away by flowing are limited in treatment effect on spontaneous combustion of residual coal. With the development of liquid inert gas preparation and refrigerated transportation technology, the liquid inert direct injection technology is gradually applied to mine fire control, and the technology fully utilizes liquid nitrogen phase change to absorb heat to quickly reduce the temperature of a medium with a height of Wen Songsan. However, due to the lack of research on liquid and gas migration and heat exchange processes of liquid nitrogen in a loose medium, the design of injection parameters of the liquid nitrogen is lack of theoretical support when the liquid nitrogen is applied on site, and the optimal fire extinguishing performance of the liquid nitrogen is difficult to develop, so that a high-temperature area still exists in a fire area after the liquid nitrogen is injected, and the treatment time of the fire area is delayed.
After the liquid nitrogen is injected into the loose medium, the liquid nitrogen is boiled and vaporized firstly, then the liquid nitrogen and the low-temperature gas penetrate into the bottom of the loose medium under the action of gravity and inertia force to carry out optimal flow path seepage along the pores, and the low-temperature nitrogen carries out forced convection diffusion under the action of vaporization and expansion of the liquid nitrogen. With the increase of the horizontal movement distance of the liquid nitrogen, the proportion of the liquid nitrogen in the liquid state and the gas state is gradually reduced until the liquid nitrogen is completely vaporized, wherein the distance between the complete vaporization position and the liquid nitrogen injection opening is called the complete vaporization radius. In the complete vaporization radius, the high temperature in the loose medium is mainly eliminated by liquid nitrogen vaporization heat absorption and low temperature nitrogen displacement replacement, and the cooling effect in the range is most direct and effective. Outside the full vaporization radius, the low temperature nitrogen is only high temperature inhibited by heat displacement, which is insufficient for the high Wen Songsan medium, and when the liquid nitrogen injection is discontinuous, the region accumulating gas is heated by the high temperature broken coal rock.
The prior research on the liquid nitrogen seepage migration characteristics after the liquid nitrogen is directly injected into the coal mine goaf is less, so that the thermal replacement process and efficiency in the coal mine goaf are not known, the migration characteristics of the liquid nitrogen in the coal mine goaf are related to the permeability, the platform inclination angle and the liquid nitrogen injection parameters in the coal mine goaf, and therefore, the migration path and the complete vaporization radius of the liquid nitrogen in a loose medium are researched by developing different parameter changes by building a physical similar model in a laboratory, and the basis is provided for the design of the liquid nitrogen injection parameters in the coal mine goaf fire disaster relief.
Disclosure of Invention
The invention aims to provide a loose medium liquid nitrogen seepage migration characteristic test experimental device and method, which make up for the blank existing in the prior art and can determine the liquid nitrogen migration path, the complete vaporization radius and the vaporization rate in the loose medium of a coal mine goaf.
In order to achieve the above object, the present invention provides the following solutions:
the loose medium liquid nitrogen seepage migration characteristic test experimental device comprises an experimental box, a liquid nitrogen injection system, a data acquisition instrument and an information processing terminal connected with the data acquisition instrument;
the experiment box is used for containing loosening medium;
a liquid nitrogen injection port and a differential pressure temperature measuring port are arranged on the side face of the experimental box; a differential pressure gauge and a temperature gauge are arranged at the differential pressure temperature measuring port; a liquid nitrogen conveying pipe in the liquid nitrogen injection system extends into the liquid nitrogen injection port to realize liquid nitrogen injection into the experiment box;
a plurality of temperature sensors are arranged on a set area at the bottom of the experiment box;
a gas release port is formed in the top of the experiment box, and a gas mass flowmeter is arranged at the gas release port;
the gas mass flowmeter, the differential pressure meter, the temperature meters and all the temperature sensors are connected with the data acquisition instrument.
Optionally, the device further comprises a box tilting structure; the box body tilting mechanism is arranged under the adjusting area at the bottom of the experimental box and is used for adjusting the tilting angle of the experimental box.
Optionally, the liquid nitrogen injection system comprises a liquid nitrogen tank, an electronic balance and a nitrogen tank; the nitrogen tank stores high-pressure nitrogen; the liquid nitrogen tank is arranged on the electronic balance; the liquid nitrogen tank is communicated with the nitrogen tank through a nitrogen conveying pipe.
Optionally, a pressure reducing valve is arranged on the nitrogen delivery pipe.
Optionally, the liquid nitrogen injection port and the differential pressure temperature measurement port are diagonally arranged on the same side of the experimental box.
Optionally, the temperature sensors are uniformly arranged in the setting area.
A method for testing an experimental device based on the seepage migration characteristics of liquid nitrogen as a loose medium, comprising the following steps:
step one, preprocessing; the method comprises the steps of replacing gas in an experiment box by nitrogen, and filling loose media with different particle sizes in the experiment box;
step two, recording the inclination angle of the experiment box;
step three, adjusting the speed of liquid nitrogen entering the experiment box and recording;
and fourthly, recording temperature information at the bottom of the experimental box, pressure information from a differential pressure temperature measurement port and gas mass flow information at a gas release port.
Optionally, the method further comprises:
and fifthly, adjusting the inclination angle of the experiment box, and repeating the third to fourth steps.
Optionally, the method further comprises:
step six, replacing the loose media, and repeating the steps one to five.
Optionally, the loose medium is coal or pebbles.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a loose medium liquid nitrogen seepage migration characteristic test experiment device and a method, wherein the test experiment device can simulate the migration path area change, the migration speed and the liquid nitrogen vaporization rate of liquid nitrogen along the bottom of a platform under the conditions of different heat conductivities of loose mediums, different permeability of the loose mediums, different inclination angles of an experiment platform and different liquid nitrogen injection speeds.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of a test experiment platform for testing the seepage migration characteristics of bulk liquid nitrogen in an embodiment of the invention;
fig. 2 is a schematic structural diagram of a liquid nitrogen injection system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Examples
FIG. 1 is a schematic structural diagram of a test experiment platform for testing the seepage migration characteristics of bulk liquid nitrogen in an embodiment of the invention; fig. 2 is a schematic structural diagram of a liquid nitrogen injection system according to an embodiment of the present invention.
Referring to fig. 1 to 2, the loose-medium liquid nitrogen seepage migration characteristic test experimental device provided by the embodiment mainly comprises an experimental box 1, a liquid nitrogen injection system, a data acquisition instrument 2 and an information processing terminal 3 connected with the data acquisition instrument 2.
The top cover of the laboratory box 1 can be opened for filling with loose medium. The loose medium is a medium with different particle sizes, and the loose medium is stone or coal.
A liquid nitrogen injection port 4 and a differential pressure temperature measuring port 5 are arranged on the side surface of the experiment box 1; a differential pressure gauge and a temperature gauge are arranged at the differential pressure temperature measuring port 5; the liquid nitrogen delivery pipe 21 in the liquid nitrogen injection system is inserted into the liquid nitrogen injection port 4 to realize liquid nitrogen injection into the experiment box 1.
A plurality of temperature sensors 6 are arranged on a set area of the bottom of the experiment box 1.
A gas release port 7 is formed in the top of the experiment box 1, and a gas mass flowmeter is arranged at the gas release port 7.
The gas mass flowmeter, the differential pressure meter, the temperature dynamometer and all the temperature sensors are connected with the data acquisition instrument 2.
The liquid nitrogen injection system also comprises a liquid nitrogen tank 22, an electronic balance 23 and a nitrogen tank 24; the nitrogen tank 24 stores therein high-pressure nitrogen gas; the liquid nitrogen tank 22 is arranged on the electronic balance 23; the liquid nitrogen tank 22 is communicated with a nitrogen tank 24 through a nitrogen delivery pipe 25, and a pressure reducing valve 26 is further provided on the nitrogen delivery pipe 25.
The high-pressure nitrogen can be pressed into the liquid nitrogen tank 22 through the regulating pressure reducing valve 26, the liquid nitrogen can be discharged through the liquid nitrogen conveying pipe 21 under the action of the pressure of the nitrogen, the discharged size of the liquid nitrogen is positively correlated with the supply amount of the high-pressure nitrogen, in addition, the weight change of the liquid nitrogen tank 22 can be monitored in real time through the electronic balance 23, and the conveying amount of the liquid nitrogen can be monitored.
The device also comprises a box body tilting structure; the box body tilting mechanism is arranged under an adjusting area at the bottom of the experiment box 1 and is used for adjusting the tilting angle of the experiment box 1. The setting area is located in the central area of the bottom of the experiment box 1, and the adjusting area is located in the two end areas of the bottom of the experiment box 1.
The information processing terminal 3 acquires temperature information of the bottom plate of the experiment box 1, pressure information and temperature information at the pressure difference temperature measuring port 5 and gas mass flow information at the gas releasing port 7 in real time through the data acquisition instrument 2; the information processing terminal 3 draws an isotherm change graph which changes along with time through a built-in temperature interpolation method and acquired temperature information of the bottom plate of the experimental box 1 so as to analyze a liquid nitrogen diffusion path; the information processing terminal 3 calculates the liquid nitrogen vaporization rate by a built-in liquid nitrogen vaporization rate calculation method and pressure information and temperature information at the differential pressure temperature measurement port 5 and gas mass flow information at the gas release port 7.
The method for calculating the vaporization rate of the liquid nitrogen comprises the following steps:
assuming that the mass flow of liquid nitrogen injection is A kg/s, the mass flow of gas monitored by the gas release port is B kg/s, the pressure difference inside and outside the experiment box is C Mpa, the temperature is T K, and the original pressure in the experiment box is detected by the pressure difference temperature measuring portThe mass of nitrogen is M1 kg, and the residual volume of the experimental box after the experimental box is filled with the loose medium is D M 3 (neglecting the volume occupied by the liquid nitrogen after filling), therefore:
(1) The mass M2 of the gas in the experiment box is as follows: m2= pVM/RT
Wherein: p= (c+1) ×101325 Pa
V= D
M=0.028 kg/mol
R= 8.314
(2) The vaporization rate Q of liquid nitrogen is:
as a preferred embodiment, the liquid nitrogen injection port 4 and the differential pressure temperature measurement port 5 are diagonally arranged on the same side of the experimental box 1, and the liquid nitrogen injection port 4 is below the differential pressure temperature measurement port 5.
As a preferred embodiment, the temperature sensors 6 are uniformly arranged in the setting area.
As a preferred embodiment, the information processing terminal 3 is a computer.
As a preferred example, the experimental box 1 is composed of a transparent acrylic plate.
Examples
The invention provides an experimental method by adopting the device provided in the first embodiment, which specifically comprises the following steps:
step one, preprocessing; specifically, nitrogen is used for replacing gas in the experimental box, and then loose media with different particle sizes are filled in the experimental box.
And step two, recording the inclination angle of the experiment box.
And step three, adjusting the speed of liquid nitrogen entering the experiment box and recording.
And fourthly, recording temperature information at the bottom of the experimental box, pressure information from a differential pressure temperature measurement port and gas mass flow information at a gas release port.
And fifthly, adjusting the inclination angle of the experiment box, and repeating the third to fourth steps.
Step six, replacing the loose media, and repeating the steps one to five.
The experimenter draws a time-dependent isotherm change map to analyze the liquid nitrogen diffusion path according to the calculation method provided in example one, and calculates the liquid nitrogen vaporization rate according to the calculation method provided in example one.
Examples
The invention also provides an experimental method by adopting the device provided by the first embodiment, which comprises the following steps:
and 1, replacing gas in an experiment box by using nitrogen before the experiment starts, and then respectively filling stones with diameters of 1-2cm,2-3cm and 3-5 cm as loose media through the top of the experiment box to perform the experiment (the difference of average particle sizes can cause the difference of the permeability of the loose media).
And 2, adjusting the inclination angle of the experiment box to be horizontal (namely 0 degree), and adjusting the speed of nitrogen entering the liquid nitrogen tank through adjusting the pressure reducing valve so as to adjust the speed of liquid nitrogen entering the experiment box.
And 3, after the liquid nitrogen is injected into the experiment box through the liquid nitrogen injection port, monitoring the temperature change of each place of the bottom plate of the experiment box by using a temperature sensor, and drawing an isotherm change diagram of the bottom plate of the experiment box along with the time change by using a temperature interpolation method in the information processing terminal so as to analyze a liquid nitrogen diffusion path.
And 4, monitoring the pressure change in the experiment box in real time through a differential pressure meter, monitoring the temperature change in the experiment box in real time through a temperature meter, reversely calculating the liquid nitrogen vaporization rate by adopting a liquid nitrogen vaporization rate calculation method in an information processing terminal in combination with the measurement result of the gas mass flowmeter at the gas release port, and finally analyzing the influence of the permeability on the liquid nitrogen migration path and the vaporization rate.
And 5, respectively adjusting the inclination angle of the experimental platform to 15 degrees, 30 degrees, 45 degrees and 60 degrees, repeating the experimental process of the steps 1-4, and analyzing the influence of the inclination angle of the experimental platform on the liquid nitrogen migration path and the vaporization rate.
And 6, changing the filling medium into coal, repeating the experimental process of the steps 1-5, and analyzing the influence of the difference of the filling medium on the liquid nitrogen migration path and the vaporization rate.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (9)
1. The loose medium liquid nitrogen seepage migration characteristic test experiment device is characterized by comprising an experiment box, a liquid nitrogen injection system, a data acquisition instrument and an information processing terminal connected with the data acquisition instrument;
the experiment box is used for containing loosening medium;
a liquid nitrogen injection port and a differential pressure temperature measuring port are arranged on the side face of the experimental box; a differential pressure gauge and a temperature gauge are arranged at the differential pressure temperature measuring port; a liquid nitrogen conveying pipe in the liquid nitrogen injection system extends into the liquid nitrogen injection port to realize liquid nitrogen injection into the experiment box;
a plurality of temperature sensors are arranged on a set area at the bottom of the experiment box;
a gas release port is formed in the top of the experiment box, and a gas mass flowmeter is arranged at the gas release port;
the gas mass flowmeter, the differential pressure meter, the temperature meter and all the temperature sensors are connected with the data acquisition instrument;
the device also comprises a box body tilting structure; the box body tilting structure is arranged below the adjusting area at the bottom of the experimental box and is used for adjusting the tilting angle of the experimental box;
the information processing terminal acquires temperature information of the bottom plate of the experiment box, pressure information and temperature information of the pressure difference temperature measuring port and gas mass flow information of the gas releasing port in real time through the data acquisition instrument; the information processing terminal draws an isotherm change graph which changes along with time through a built-in temperature interpolation method and acquired temperature information of a bottom plate of the experiment box so as to analyze a liquid nitrogen diffusion path; the information processing terminal calculates the liquid nitrogen vaporization rate through a built-in liquid nitrogen vaporization rate calculation method, pressure information and temperature information at the pressure difference temperature measurement port and gas mass flow information at the gas release port.
2. The loose-media liquid nitrogen seepage migration characteristic test experiment device according to claim 1, wherein the liquid nitrogen injection system comprises a liquid nitrogen tank, an electronic balance and a nitrogen tank; the nitrogen tank stores high-pressure nitrogen; the liquid nitrogen tank is arranged on the electronic balance; the liquid nitrogen tank is communicated with the nitrogen tank through a nitrogen conveying pipe.
3. The loose-media liquid nitrogen seepage migration characteristics test experiment apparatus according to claim 2, wherein a pressure reducing valve is provided on the nitrogen delivery pipe.
4. The loose-media liquid nitrogen seepage migration characteristics test experiment apparatus according to claim 1, wherein the liquid nitrogen injection port and the differential pressure temperature measurement port are diagonally arranged on the same side of the experiment box.
5. The bulk liquid nitrogen seepage migration characterization test device of claim 1, wherein the temperature sensors are uniformly disposed within the set region.
6. A method of testing an experimental set-up based on the bulk liquid nitrogen seepage migration characteristics of any one of claims 1-5, said method comprising:
step one, preprocessing; the method comprises the steps of replacing gas in an experiment box by nitrogen, and filling loose media with different particle sizes in the experiment box;
step two, recording the inclination angle of the experiment box;
step three, adjusting the speed of liquid nitrogen entering the experiment box and recording;
and fourthly, recording temperature information at the bottom of the experimental box, pressure information from a differential pressure temperature measurement port and gas mass flow information at a gas release port.
7. The method of testing an experimental set-up based on bulk liquid nitrogen seepage migration characteristics of claim 6, further comprising:
and fifthly, adjusting the inclination angle of the experiment box, and repeating the third to fourth steps.
8. The method of testing an experimental set-up based on bulk liquid nitrogen seepage migration characteristics of claim 7, further comprising:
step six, replacing the loose media, and repeating the steps one to five.
9. The method of testing an experimental set-up based on the characteristics of liquid nitrogen seepage migration of a loose medium according to claim 6, wherein the loose medium is coal or stone.
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| CN110044799B (en) * | 2019-06-04 | 2024-02-09 | 河南理工大学 | Heterogeneous coal-bearing rock system nitrogen injection migration path and permeability testing device and method |
| CN112083029B (en) * | 2020-08-13 | 2022-11-25 | 四川士达特种炭材有限公司 | Filler comprehensive performance evaluation device and method |
| 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 |
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