CN110162900A - A method of simulation coal-bed flooding flow event - Google Patents
A method of simulation coal-bed flooding flow event Download PDFInfo
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- CN110162900A CN110162900A CN201910449651.1A CN201910449651A CN110162900A CN 110162900 A CN110162900 A CN 110162900A CN 201910449651 A CN201910449651 A CN 201910449651A CN 110162900 A CN110162900 A CN 110162900A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000004088 simulation Methods 0.000 title claims abstract description 23
- 239000003245 coal Substances 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000002591 computed tomography Methods 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 238000002347 injection Methods 0.000 claims abstract description 7
- 239000007924 injection Substances 0.000 claims abstract description 7
- 238000011946 reduction process Methods 0.000 claims abstract description 6
- 230000002596 correlated effect Effects 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 230000001419 dependent effect Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 239000000284 extract Substances 0.000 claims description 2
- 230000008676 import Effects 0.000 claims description 2
- 239000000428 dust Substances 0.000 abstract description 8
- 238000000151 deposition Methods 0.000 abstract description 3
- 230000002265 prevention Effects 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 12
- 239000000243 solution Substances 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 108010076504 Protein Sorting Signals Proteins 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000476 body water Anatomy 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
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- 238000003384 imaging method Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 206010035653 pneumoconiosis Diseases 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10072—Tomographic images
- G06T2207/10081—Computed x-ray tomography [CT]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20024—Filtering details
- G06T2207/20032—Median filtering
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06T5/00—Image enhancement or restoration
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Abstract
The present invention provides a kind of method for simulating coal-bed flooding flow event, is related to dust prevention and control technical field.The present invention obtains coal body original-gray image by CT scan, median filtering noise reduction process is carried out to coal body original gradation figure obtained by MATLAB software, obtain txt formatted file, it is then introduced into COMSOL software, coal body model is reconstructed with interpolating function, assigns model correlated variables parameter, model initial boundary conditions are set, network is divided, and numerical simulation is carried out to injection water coal sample flow event, obtains flowing law of the water under the true hole of coal body.Method provided by the invention is simple to operate, effectively shortens experimental period and cost, provides theoretical foundation and technical support to flowing law of the accurate description water in coal body, provides directive significance for coal-bed flooding depositing dust technique.
Description
Technical field
The present invention relates to dust prevention and control technical field more particularly to a kind of methods for simulating coal-bed flooding flow event.
Background technique
With the needs that mine coal production is exploited, the efficient mining process cutting tooth cutting shattering process of underground mine is always
Along with the generation of a large amount of coal dusts, the coal miner that is exposed on working face under the conditions of high concentrate dust for a long time and easily suffer from serious
Pneumoconiosis (CWP), while high concentrate dust is also serious restriction underground coal safety the main reason for inducing dust explosion disaster
Production.Coal dust water filling is used as the dust-proof protrusion-dispelling of underground high-efficient, drive row gas main method, is increasingly used in producing
Cheng Zhong.In order to study seepage flow flow process of the water in coal seam in the injecting process with pressure, need to be unfolded to coal body internal holes crazing
The specific research of gap.However since coal body internal void fissured structure is complicated, the flow event of water can not be monitored effectively, so that coal
The research of Moisture migration is difficult to move even one step in body.Currently, being directed to the study limitation in coal body internal void crack in numerical simulation
Emulation, and the existing simulation software model basic condition setting based on finite element method design is relatively-stationary, Bu Nengmo
Intend the process of the water filling seepage flow under true hole, i.e., the crack in model needs default and can not change, this is practical not with scene
Symbol.So the method for coal and rock hole fissured structure can be constructed nondestructively really to probe into fortune of the water in coal body by being badly in need of one kind
Dynamic process.
Summary of the invention
The technical problem to be solved by the present invention is in view of the above shortcomings of the prior art, provide a kind of simulation coal-bed flooding infiltration
The method of stream process, can accurate description coal-bed flooding when coal sample seepage process, to hole change accurate description, analyze and research water
In the mechanism and the characteristics of motion of coal body flowing, directive significance is provided for coal-bed flooding depositing dust technique.
In order to solve the above technical problems, the technical solution used in the present invention is:
A method of simulation coal-bed flooding flow event, comprising the following steps:
Step 1 carries out CT scan to the coal sample after test tape pressure injection water, obtains original-gray image；
Using Industrial X-ray CT detection system, by cone-beam scan and DR real time imagery Through Several Survey Measure, to coal sample into
Row scanning imagery nondestructively scans the hole fissured structure inside coal body, obtains original-gray image；
Step 2 carries out median filtering noise reduction process to original-gray image with MATLAB, obtains txt formatted file；
The pore structural information in the original-gray image of CT scan is carried out using the I=imread function in MATLAB
Identification reads one layer of picture of coal, and noise spot in picture is carried out noise reduction process using median filtering function, and use
Fid=fopen function in MATLAB extracts each information put on image, exports as txt formatted file；
Step 3 imports obtained txt formatted file in COMSOL software, with interpolating function by coal body model weight
Structure；
The size for corresponding to picture to txt formatted file obtained models, and picture size is 2.88cm × 3.01cm,
Inputted in txt formatted file under %grid and input two groups of numbers, one group be 1-301, another group be 1-288, obtained
%data is inputted before data, selects interpolating function to be imported in COMSOL global definition；
Step 4 assigns model correlated variables parameter；
Keying in density under global definition parameter in COMSOL software is 1000kg/m3, dynamic viscosity 0.001Pa, material
Expect Attributions selection CoAI；
Step 5, setting model initial boundary conditions；
Physical field selects coefficient form boundary partial differential equation, and dependent variable physical quantity selects Head (m), the choosing of source item physical quantity
Head is selected to change over time；Boundary setting is carried out to obtained geometrical model, the coboundary of coal body is set as the head of 20mm,
Lower boundary is set as the head of 0mm, generates the head difference of 20mm, and driving fluid flows, and right boundary is impermeable；
Step 6 divides network, and carries out numerical simulation to injection water coal sample flow event；
According to the specification of selected materials, the unit size in crack is refined, the unit size of setting crack position is
57.2mm is arranged in 5mm, other positions；Setting be modeled as steady-flow, by simulation process obtain water in coal body motion process,
The accurate description of wetted perimeter.
The beneficial effects of adopting the technical scheme are that simulation coal-bed flooding flow event provided by the invention
Method image is handled by MATLAB median filtering using CT scan coal body image, and then obtain each of image
Point gray value provides modeling foundation for the accurate microcosmic hole fissured structure of coal body that presents.With COMSOL interpolating function by coal body into
Hole crack distribution characteristics on coal body is finely characterized, avoids and directly preset to coal body model by row model reconstruction
Crack condition more can accurately express the hole crack inside coal body, more can accurately be consistent with scene.At MATLAB
Image is managed, is finely characterized Coal Pore Structure with COMSOL simulation software (all suitable for the image after each CT scan
With), and water filling simulation is carried out, it effectively optimizes and is lauched the rule flowed in coal body in micro-scale, using laboratory experiment
The method combined with computer simulation further improves the accuracy of model and the reliability of experiment, is that coal-bed flooding is real
It tests and provides reliably modeling method and calculation method, provide directive significance for coal-bed flooding depositing dust technique.
Detailed description of the invention
Fig. 1 is the method flow diagram of simulation coal-bed flooding flow event provided in an embodiment of the present invention；
Fig. 2 is CT scan equipment schematic provided in an embodiment of the present invention；
Fig. 3 is CT scan original graph provided in an embodiment of the present invention；
Fig. 4 is that median filtering provided in an embodiment of the present invention filters out noise figure；
Fig. 5 is coal body micropore structure illustraton of model provided in an embodiment of the present invention；
Fig. 6 is that prototype network provided in an embodiment of the present invention divides figure；
Fig. 7 is coal-bed flooding seepage simulation result figure provided in an embodiment of the present invention.
In figure: 1, radiographic source；2, cone-beam x-ray；3, coal sample；4, imaging plane；5, planar array detector.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
Coal sample is cut into 4cm × 4cm × 10cm cuboid in use for laboratory certified reference coal cutting machine first, to coal body
Water filling with pressure is carried out, water flow is made to penetrate into coal body.Coal-bed flooding flow event is simulated using method provided in this embodiment, is such as schemed
Shown in 1, it is described that specific step is as follows.
Step 1 carries out CT scan to the coal sample after test tape pressure injection water, obtains original-gray image；
For CT scan equipment principle as shown in Fig. 2, coal sample 3 is lain in a horizontal plane on objective table, opening radiographic source 1 makes cone-beam
Ray 2 penetrates coal sample 3, can be imaged on planar array detector 5, and complete image is chosen on planar array detector 5；
Step 2 carries out median filtering noise reduction process to original-gray image with MATLAB, obtains txt formatted file:
CT scan original graph is as shown in figure 3, noise spot in picture is handled using median filtering function, and utilizes
The value of pixel each present on image is exported as txt formatted file by MATLAB.That is: a digital signal sequences are carried out
When filtering processing, the long window that a length is odd number L, L=2n+1 are defined first, and window signal sample is (x1,x2,
x3......xn), n size of data is arranged, x1<x2<x3<......<xn, then have:
Wherein, y is series of windows (x1,x2,x3......xn) intermediate value.
Window is slided in data, by window hit exactly pair pixel value replaced with the intermediate value of each pixel of window, it may be assumed that
Y (i)=med [x (i-N) ..., x (i) ..., x (i+N)]
Original-gray image eliminates the noise point of image, is effectively retained after the median filter process of MATLAB
The pore character and boundary information of coal body, it is as shown in Figure 4 that median filtering filters out noise figure.
Txt formatted file is imported COMSOL by step 3, rebuilds coal body model with interpolating function.In group
Selection parameter curved surface in geometry is built, the first parameter is s1, minimum value 0, maximum value 301.Second parameter is s2, minimum
Value is 0, maximum value 288.Setting relative tolerance is 1e-1, and maximum knot number is 50.Coal body micropore structure illustraton of model such as Fig. 5
It is shown.
Step 4 assigns model correlated variables parameter:
Keying in density under global definition parameter in COMSOL is 1000kg/m3, dynamic viscosity 0.001Pa, material category
Property selection CoAI.
Step 5, setting model initial boundary conditions:
The coboundary that coal body is arranged is the head of 20mm, and in the head of lower boundary setting 0mm, which produces the water of 20mm
Head is poor, driving fluid flowing, and right boundary is impermeable.
According to but be not limited to cubic law and describe flowing law of the water in coal body, i.e., withAs
The mathematical model of seepage simulation, wherein ρ is fluid density, and g is acceleration of gravity, and μ is the dynamic viscosity of fluid, and a is crack
Porosity, KsFor hydraulic conductivity.Flux in crack is provided by speedThis depends on hydraulic conductivity Ks, water
Head H=H (x, y) and hydraulic gradientAccording to hydraulic conductivity KsWith coefficient of transmissibility TsPer unit crack can also be calculated
The displacement of widthAnd ideal conditions there are (for example, rough surface) when deviation, can be used thick
Rough coefficient f adjusts cubic law, therefore coefficient of transmissibility isWherein describe what fluid in rock fracture flowed
Potential-flow model uses Reynolds equationIt, can be into if the other Fluid Control Equations of researcher's addition in need
Row addition manually.
Step 6 divides network, and carries out numerical simulation to injection water coal sample flow event；
According to the specification of selected materials, in order to accurately reach the precision of solution, it is desirable that the unit size in crack is refined.
The unit size that crack position is arranged is 5mm, and 57.2mm is arranged in other positions.Setting is modeled as steady-flow.After network divides
As shown in Figure 6.
Coal-bed flooding seepage simulation result figure is as shown in fig. 7, arrow direction as shown in the figure is seepage water in coal body
Flow path.Water can be obtained during by coal body, it is obvious in main crack flow process, it is shunted in the middle part of secondary interstice
It is dynamic, it is not flowed substantially in base portion.For water in coal body flow process, speed overall trend is to be gradually reduced.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify to technical solution documented by previous embodiment, or some or all of the technical features are equal
Replacement；And these are modified or replaceed, model defined by the claims in the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (7)
1. a kind of method for simulating coal-bed flooding flow event, it is characterised in that: the following steps are included:
Step 1 carries out CT scan to the coal sample after test tape pressure injection water, obtains original image grayscale image；
Step 2 carries out median filtering noise reduction process to original image grayscale image with MATLAB, obtains txt formatted file；
Step 3 imports obtained txt formatted file in COMSOL software, with interpolating function by coal body model reconstruction；
Step 4 assigns model correlated variables parameter；
Step 5, setting model initial boundary conditions；
Step 6 divides network, and carries out numerical simulation to injection water coal sample flow event, obtains water in coal body by simulation process
The accurate description of middle motion process, wetted perimeter.
2. the method for simulation coal-bed flooding flow event according to claim 1, it is characterised in that: in the step 1, adopt
Coal sample is scanned by cone-beam scan and DR real time imagery Through Several Survey Measure with Industrial X-ray CT detection system
Picture nondestructively scans the hole fissured structure inside coal body, obtains original image grayscale image.
3. the method for simulation coal-bed flooding flow event according to claim 1, it is characterised in that: in the step 2, adopt
The pore structural information in the original image grayscale image of CT scan is identified with the I=imread function in MATLAB, is read
One layer of picture of coal is taken, and noise spot in picture is subjected to noise reduction process using median filtering function, and in MATLAB
Fid=fopen function extracts each information put on image, exports as txt formatted file.
4. the method for simulation coal-bed flooding flow event according to claim 1, it is characterised in that: right in the step 3
The size that txt formatted file obtained corresponds to picture is modeled, and picture size is 2.88cm × 3.01cm, in txt format
Inputted in file under %grid and input two groups of numbers, one group be 1-301, another group be 1-288, it is defeated before obtained data
Enter %data, selects interpolating function to be imported in COMSOL global definition.
5. the method for simulation coal-bed flooding flow event according to claim 1, it is characterised in that: in the step 4,
Keying in density in COMSOL software under global definition parameter is 1000kg/m3, dynamic viscosity 0.001Pa, material properties selection
CoAI。
6. the method for simulation coal-bed flooding flow event according to claim 1, it is characterised in that: in the step 5, object
Manage field select coefficient form boundary partial differential equation, dependent variable physical quantity select Head (m), source item physical quantity selection head with
Time change；Boundary setting is carried out to obtained geometrical model, the coboundary of coal body is set as the head of 20mm, lower boundary setting
For the head of 0mm, the head difference of 20mm is generated, driving fluid flows, and right boundary is impermeable.
7. the method for simulation coal-bed flooding flow event according to claim 1, it is characterised in that: in the step 6, root
According to the specification of selected materials, the unit size in crack is refined, the unit size of setting crack position is 5mm, other positions
Install 57.2mm；Setting is modeled as steady-flow.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110702570A (en) * | 2019-09-24 | 2020-01-17 | 山东科技大学 | Method for realizing visualization of coal body pore fracture dynamic seepage process |
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Application publication date: 20190823 |