CN109406372A - A kind of pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing and method - Google Patents
A kind of pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing and method Download PDFInfo
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- CN109406372A CN109406372A CN201811541100.XA CN201811541100A CN109406372A CN 109406372 A CN109406372 A CN 109406372A CN 201811541100 A CN201811541100 A CN 201811541100A CN 109406372 A CN109406372 A CN 109406372A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 283
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 137
- 239000007788 liquid Substances 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000013508 migration Methods 0.000 title claims abstract description 24
- 230000005012 migration Effects 0.000 title claims abstract description 24
- 238000012360 testing method Methods 0.000 title claims abstract description 23
- 239000007789 gas Substances 0.000 claims abstract description 36
- 239000003245 coal Substances 0.000 claims abstract description 21
- 230000010365 information processing Effects 0.000 claims abstract description 10
- 238000002474 experimental method Methods 0.000 claims description 14
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 9
- 239000004575 stone Substances 0.000 claims description 4
- 239000000428 dust Substances 0.000 abstract description 6
- 230000008016 vaporization Effects 0.000 description 13
- 238000009834 vaporization Methods 0.000 description 9
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 230000002269 spontaneous effect Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 230000032258 transport Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005649 metathesis reaction Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 239000006244 Medium Thermal Substances 0.000 description 1
- 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
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012546 transfer Methods 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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- Analytical Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses a kind of pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing and methods, compensate for the blank of the prior art；The pourable medium of different-grain diameter is filled in experimental box；The side of experimental box is provided with liquid nitrogen inlet and pressure difference temperature survey mouth；Differential manometer and temperature gauge are provided at pressure difference temperature survey mouth；Liquid nitrogen injected system is extend into liquid nitrogen inlet by liquid nitrogen delivery pipe to realize that liquid nitrogen is injected into experimental box；Multiple temperature sensors are disposed in the setting regions of experimental box bottom；Gas liberation port is offered at the top of experimental box, and gas mass flow meter is provided at gas liberation port；Gas mass flow meter, differential manometer, temperature gauge and all temperature sensors are connect with data collecting instrument, and data collecting instrument is connect with the information processing terminal.The present invention is measured liquid nitrogen dust trajectory in the pourable medium of coal mine gob by the device, completely vaporizes radius and boil-off rate.
Description
Technical field
The present invention relates to liquid nitrogen seepage flow migration characteristics the field of test technology, more particularly to a kind of pourable medium liquid nitrogen seepage flow
Migration characteristics experimental apparatus for testing and method.
Background technique
China's coal-mine spontaneous fire accident is extremely serious, in national coal mine with the presence of 56% mine Period of Coal Seam Spontaneous Combustion danger
Danger, wherein thick coal-layer mining spontaneous fire is even more serious.When coal mine gob spontaneous combustion occurs, it is empty to be limited by coal mine work area operation
Between and monitoring means influence, currently also cannot achieve the accurate detection of coal mine gob deep high temperature self-ignition point.It is current domestic
Outer master's spontaneous combustion administering method in coal mine gob to be used has: water filling grouting, inert gas, pressure balance for air control, gel smother, bubble
Foam fire extinguishing etc., the above technology have played important function for administering coal spontaneous combustion, but since coal mine gob self-ignition point position is sentenced
Fixed difficulty, other flame range administering methods in addition to inert gas are difficult to directly act on ignition region.However, inert gas due to
Good mobility and diffusivity, which are both easy to act on high temperature ignition region or are easy diffusion, to be lost, thus infuse it is lazy caused by stop up
The heat that breath effect and flowing are taken away is limited for the governance role of spontaneous combustion of remaining coal.With the preparation of liquid noble gas and Refrigerated Transport skill
The development of art, the lazy straight note technology of liquid are gradually applied in mine fire improvement, which makes full use of liquid nitrogen decalescence fast
Speed reduces hot loose medium temperature.But due to lacking liquid nitrogen, liquid, fate are moved in pourable medium and heat transfer process is studied, and are led
Its injection parameter design when field application liquid nitrogen is caused to lack theory support, it is difficult to which the best extinguishing property for playing liquid nitrogen causes liquid
High-temperature area is still had after nitrogen injection in flame range, delay flame range administers the time.
After liquid nitrogen injects pourable medium, liquid nitrogen boils vaporization first, and then liquid nitrogen and cryogenic gas are in gravity and inertia
Go deep into pourable medium bottom under the action of power and carry out optimal flow path seepage flow along hole, low temperature nitrogen is expanded in liquid nitrogen vaporization
Effect is lower to carry out forced convection diffusion.With the increase of liquid nitrogen horizontal moving distance, liquid nitrogen ratio is gradually decreased in liquid, gas binary states
Until completely vaporizing, claim to completely vaporize radius away from the spacing of liquid nitrogen inlet wherein completely vaporizing position.Completely vaporizing radius
Interior, high temperature is mainly eliminated by liquid nitrogen vaporization heat absorption and low temperature nitrogen displacement metathesis in pourable medium, within the scope of this
Cooling effect the most directly and effectively.Completely vaporizing outside radius, low temperature nitrogen be only through heat displacement metathesis into
Row high temperature inhibits, and the heat displacement to hot loose medium is simultaneously insufficient, and when liquid nitrogen injection is discontinuous, which accumulates gas
Body can be heated again by high-temperature crushing coal petrography.
Liquid nitrogen seepage flow migration characteristics research after currently directly infusing coal mine gob about liquid nitrogen is less, causes directly to infuse liquid nitrogen
Hot swapping process and efficiency when coal mine gob lack understanding, and transport characteristics of the liquid nitrogen in coal mine gob and coal mine are mined out
Permeability, platform inclination angle, liquid nitrogen injection parameter in area is related, therefore is carried out not by building physically scaled model in laboratory
Under same parameter variation, studies dust trajectory of the liquid nitrogen in pourable medium and completely vaporize radius, rescued for coal mine gob fire
The design of liquid nitrogen injection parameter provides foundation when calamity.
Summary of the invention
The object of the present invention is to provide a kind of pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing and methods, make up
Blank of the existing technology can measure liquid nitrogen dust trajectory in the pourable medium of coal mine gob, completely vaporize radius and vapour
Change rate.
To achieve the above object, the present invention provides following schemes:
A kind of pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing, including experimental box, liquid nitrogen injected system, data
Acquisition Instrument and the information processing terminal being connect with the data collecting instrument；
The experimental box is for holding pourable medium；
The side of the experimental box is provided with liquid nitrogen inlet and pressure difference temperature survey mouth；It is measured in the pressure difference temperature
Differential manometer and temperature gauge are provided at mouthful；Liquid nitrogen delivery pipe in the liquid nitrogen injected system is by extending into the liquid nitrogen
To realize that liquid nitrogen injects the experimental box in inlet；
Multiple temperature sensors are disposed in the setting regions of the experimental box bottom；
Gas liberation port is offered at the top of the experimental box, and is provided with gaseous mass at the gas liberation port
Flowmeter；
The gas mass flow meter, the differential manometer, the temperature gauge and all temperature sensors are equal
It is connect with the data collecting instrument.
Optionally, described device further includes cabinet incline structure；The cabinet incline structure is arranged at the experimental box bottom
Under the adjustment region in portion, for adjusting the tilt angle of the experimental box.
Optionally, the liquid nitrogen injected system includes liquid nitrogen container, electronic balance and nitrogen gas tank；It is stored in the nitrogen gas tank
High pressure nitrogen；The liquid nitrogen container is arranged on the electronic balance；The liquid nitrogen container passes through nitrogen delivery pipe and the nitrogen gas tank
Connection.
Optionally, pressure reducing valve is provided in the nitrogen delivery pipe.
Optionally, the same side of the experimental box is diagonally arranged in the liquid nitrogen inlet and the pressure difference temperature survey mouth
Face.
Optionally, the temperature sensor is uniformly arranged in the setting regions.
A method of based on pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing, comprising:
Step 1, pretreatment；Specially the gas inside experimental box is replaced using nitrogen, then in experimental box
Fill the pourable medium of different-grain diameter；
Step 2 records experimental box tilt angle；
Step 3, adjustment liquid nitrogen enter the speed and record of experimental box；
Step 4 records the temperature information of experimental box bottom, the pressure information that pressure difference temperature survey mouth goes out and gas and releases
Put the gas mass flow information at mouth.
Optionally, the method also includes:
Step 5, regulation experiment case tilt angle, repeats step 3 to step 4.
Optionally, the method also includes:
Step 6 replaces pourable medium, repeats step 1 to step 5.
Optionally, the pourable medium is coal or stone.
The specific embodiment provided according to the present invention, the invention discloses following technical effects:
The present invention provides a kind of pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing and method, the test experiments
Device can simulate different pourable medium thermal conductivitys, different pourable medium permeabilities, different experiments platform inclination angle, different liquid nitrogen notes
Enter under velocity conditions liquid nitrogen along the dust trajectory regional change of mesa base, migration velocity and liquid nitrogen vaporization rate.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram of pourable medium of embodiment of the present invention liquid nitrogen seepage flow migration characteristics test experiments platform；
Fig. 2 is the structural schematic diagram of liquid nitrogen of embodiment of the present invention injected system.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Embodiment one
Fig. 1 is the structural schematic diagram of pourable medium of embodiment of the present invention liquid nitrogen seepage flow migration characteristics test experiments platform；Fig. 2
For the structural schematic diagram of liquid nitrogen injected system of the embodiment of the present invention.
Referring to Fig. 1 to Fig. 2, pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing provided in this embodiment is mainly wrapped
Include experimental box 1, liquid nitrogen injected system, data collecting instrument 2 and the information processing terminal 3 connecting with the data collecting instrument 2.
1 top cover of experimental box can be opened, for loading pourable medium.The pourable medium is the medium of different-grain diameter, should
Pourable medium is stone or coal.
The side of experimental box 1 is provided with liquid nitrogen inlet 4 and pressure difference temperature survey mouth 5；At pressure difference temperature survey mouth 5
It is provided with differential manometer and temperature gauge；Liquid nitrogen delivery pipe 21 in liquid nitrogen injected system is by extending into liquid nitrogen inlet 4
To realize liquid nitrogen injection experiments case 1.
Multiple temperature sensors 6 are disposed in the setting regions of 1 bottom of experimental box.
Gas liberation port 7 is offered at the top of experimental box 1, and is provided with gas mass flow at gas liberation port 7
Meter.
Gas mass flow meter, differential manometer, temperature dynamometer and all temperature sensors connect with data collecting instrument 2
It connects.
Liquid nitrogen injected system further includes liquid nitrogen container 22, electronic balance 23 and nitrogen gas tank 24；High pressure is stored in nitrogen gas tank 24
Nitrogen；The upper of electronic balance 23 is arranged in liquid nitrogen container 22；Liquid nitrogen container 24 is connected to by nitrogen delivery pipe 25 with nitrogen gas tank 24, and
Pressure reducing valve 26 is additionally provided in nitrogen delivery pipe 25.
High pressure nitrogen can be pressed into liquid nitrogen container 22 by adjusting pressure reducing valve 26, liquid nitrogen will lead under nitrogen pressure effect
The discharge of liquid nitrogen delivery pipe 21 is crossed, the size of discharge and the supply amount of high pressure nitrogen are positively correlated, in addition it can pass through electronics day
The weight change of liquid nitrogen container 22 can be monitored in real time in chessboard 23, and then can monitor the conveying capacity of liquid nitrogen.
The device further includes cabinet incline structure；Cabinet incline structure is arranged under the adjustment region of 1 bottom of experimental box,
For adjusting the tilt angle of the experimental box 1.Wherein, setting regions is located at the middle section of 1 bottom of experimental box, adjustment region
For positioned at two end regions in 1 bottom of experimental box.
The information processing terminal 1 obtains the temperature information of 1 bottom plate of experimental box by data collecting instrument 2 in real time, pressure difference temperature is surveyed
Measure the gas mass flow information at the pressure information and temperature information and gas liberation port 7 at mouth 5；The information processing terminal 1
The thermoisopleth changed over time variation is drawn by the temperature information of built-in temperature interpolation method and 1 bottom plate of experimental box of acquisition
Figure is to analyze liquid nitrogen diffusion path；The information processing terminal 1 is surveyed by built-in liquid nitrogen vaporization rate calculation method and pressure difference temperature
It measures the gas mass flow information at the pressure information and temperature information, gas liberation port 7 at mouth 5 and calculates liquid nitrogen vaporization rate.
Wherein, the calculation method of liquid nitrogen vaporization rate:
Assuming that liquid nitrogen implantation quality flow is A kg/s, the gas mass flow that gas liberation port monitors is B kg/s,
Pressure difference temperature survey mouth monitors that the pressure difference inside and outside experimental box is C Mpa, and temperature is T K, and original nitrogen mass is in experimental box
M1kg, it is D m that experimental box, which has filled the residual volume after pourable medium,3(ignoring shared volume after liquid nitrogen is filled with), therefore:
(1) the gaseous mass M2 in experimental box are as follows: M2=pVM/RT
In formula: p=(C+1) × 101325Pa
V=D
M=0.028kg/mol
R=8.314
(2) the boil-off rate Q of liquid nitrogen are as follows:
Experimental box 1 is diagonally arranged in embodiment as one preferred, liquid nitrogen inlet 4 and pressure difference temperature survey mouth 5
Same side, and liquid nitrogen inlet 4 is below pressure difference temperature survey mouth 5.
Embodiment as one preferred, temperature sensor 6 are uniformly arranged in the setting regions.
Embodiment as one preferred, the information processing terminal 3 are computer.
Embodiment as one preferred, experimental box 1 are made of transparent acrylic.
Embodiment two
The device that the present invention uses embodiment one to provide, provides a kind of experimental method, specifically comprises the following steps:
Step 1, pretreatment；Specially the gas inside experimental box is replaced using nitrogen, then in experimental box
Fill the pourable medium of different-grain diameter.
Step 2 records experimental box tilt angle.
Step 3, adjustment liquid nitrogen enter the speed and record of experimental box.
Step 4 records the temperature information of experimental box bottom, the pressure information that pressure difference temperature survey mouth goes out and gas and releases
Put the gas mass flow information at mouth.
Step 5, regulation experiment case tilt angle, repeats step 3 to step 4.
Step 6 replaces pourable medium, repeats step 1 to step 5.
Experimenter draws the thermoisopleth variation diagram changed over time according to the calculation method provided in embodiment one to divide
Liquid nitrogen diffusion path is analysed, liquid nitrogen vaporization rate is calculated according to the calculation method provided in embodiment one.
Embodiment three
The device that the present invention uses embodiment one to provide, additionally provides a kind of experimental method, specifically comprises the following steps:
Step 1, experiment first replace gas in experimental box using nitrogen before starting, then by the top of experimental box
Filling diameter is 1-2cm respectively, and the stone of 2-3cm, 3-5cm are tested as pourable medium, and (difference of average grain diameter can be led
Cause the difference of pourable medium permeability).
Experimental box tilt angle is adjusted to horizontal (i.e. 0 degree) by step 2, adjusts nitrogen feed liquor nitrogen by adjusting pressure reducing valve
The speed of tank, and then adjust liquid nitrogen and enter the speed in experimental box.
It is each using temperature sensor monitoring experimental box bottom plate after step 3, liquid nitrogen pass through in liquid nitrogen inlet injection experiments case
Place temperature change draws the thermoisopleth that experimental box bottom plate changes over time using the temperature interpolation method in the information processing terminal
Variation diagram, in analysis liquid nitrogen diffusion path.
Step 4, by pressure change in differential manometer real-time monitoring experimental box, in temperature gauge real-time monitoring experimental box
Temperature change is measured in conjunction with the gas mass flow meter at gas liberation port as a result, using the liquid nitrogen vapour in the information processing terminal
Rate calculation method inverse liquid nitrogen vaporization rate, the final influence for analyzing permeability for liquid nitrogen dust trajectory and boil-off rate.
Step 5, adjust separately experiment porch inclination angle be 15 degree, 30 degree, 45 degree and 60 degree, repeatedly step 1-4 experimentation,
Analyze influence of the experiment porch inclination angle for liquid nitrogen dust trajectory and boil-off rate.
Filled media is changed to coal by step 6, repeats step 1-5 experimentation, and the difference for analyzing filling medium transports liquid nitrogen
Move the influence of path and boil-off rate.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (10)
1. a kind of pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing, which is characterized in that described device include experimental box,
Liquid nitrogen injected system, data collecting instrument and the information processing terminal being connect with the data collecting instrument；
The experimental box is for holding pourable medium；
The side of the experimental box is provided with liquid nitrogen inlet and pressure difference temperature survey mouth；At the pressure difference temperature survey mouth
It is provided with differential manometer and temperature gauge；Liquid nitrogen delivery pipe in the liquid nitrogen injected system is injected by extending into the liquid nitrogen
To realize that liquid nitrogen injects the experimental box in mouthful；
Multiple temperature sensors are disposed in the setting regions of the experimental box bottom；
Gas liberation port is offered at the top of the experimental box, and is provided with gas mass flow at the gas liberation port
Meter；
The gas mass flow meter, the differential manometer, the temperature gauge and all temperature sensors are and institute
State data collecting instrument connection.
2. pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing according to claim 1, which is characterized in that described
Device further includes cabinet incline structure；The cabinet incline structure is arranged under the adjustment region of the experimental box bottom, is used for
Adjust the tilt angle of the experimental box.
3. pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing according to claim 1, which is characterized in that described
Liquid nitrogen injected system includes liquid nitrogen container, electronic balance and nitrogen gas tank；High pressure nitrogen is stored in the nitrogen gas tank；The liquid nitrogen container
It is arranged on the electronic balance；The liquid nitrogen container is connected to by nitrogen delivery pipe with the nitrogen gas tank.
4. pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing according to claim 3, which is characterized in that in institute
It states and is provided with pressure reducing valve in nitrogen delivery pipe.
5. pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing according to claim 1, which is characterized in that described
The same side of the experimental box is diagonally arranged in liquid nitrogen inlet and the pressure difference temperature survey mouth.
6. pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing according to claim 1, which is characterized in that described
Temperature sensor is uniformly arranged in the setting regions.
7. a kind of side based on pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing described in any one of claims 1-6
Method, which is characterized in that the described method includes:
Step 1, pretreatment；Specially the gas inside experimental box is replaced using nitrogen, is then filled in experimental box
The pourable medium of different-grain diameter；
Step 2 records experimental box tilt angle；
Step 3, adjustment liquid nitrogen enter the speed and record of experimental box；
Step 4 records the temperature information of experimental box bottom, the pressure information and gas liberation port that pressure difference temperature survey mouth goes out
The gas mass flow information at place.
8. the method according to claim 7 based on pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing, special
Sign is, the method also includes:
Step 5, regulation experiment case tilt angle, repeats step 3 to step 4.
9. the method according to claim 8 based on pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing, special
Sign is, the method also includes:
Step 6 replaces pourable medium, repeats step 1 to step 5.
10. the method according to claim 7 based on pourable medium liquid nitrogen seepage flow migration characteristics experimental apparatus for testing, special
Sign is that the pourable medium is coal or stone.
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| CN201811541100.XA CN109406372B (en) | 2018-12-17 | 2018-12-17 | Test experiment device and method for liquid nitrogen seepage migration characteristics of loose medium |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044799A (en) * | 2019-06-04 | 2019-07-23 | 河南理工大学 | Heterogeneous coal-bearing series note nitrogen dust trajectory and permeability test device and method |
| CN112083029A (en) * | 2020-08-13 | 2020-12-15 | 四川士达特种炭材有限公司 | Device and method for evaluating comprehensive performance of filler |
| CN114264791A (en) * | 2021-12-23 | 2022-04-01 | 中国矿业大学 | Measuring device and method for simulating phase change expansion pressure of underground coal seam low-temperature fluid |
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