CN107064450A - The experimental method of the solid thermalization multi- scenarios method of coal body stream under a kind of simulation Thermal-mechanical Coupling - Google Patents
The experimental method of the solid thermalization multi- scenarios method of coal body stream under a kind of simulation Thermal-mechanical Coupling Download PDFInfo
- Publication number
- CN107064450A CN107064450A CN201710148515.XA CN201710148515A CN107064450A CN 107064450 A CN107064450 A CN 107064450A CN 201710148515 A CN201710148515 A CN 201710148515A CN 107064450 A CN107064450 A CN 107064450A
- Authority
- CN
- China
- Prior art keywords
- coal
- temperature
- gas
- pressure
- mechanical coupling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003245 coal Substances 0.000 title claims abstract description 190
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000010168 coupling process Methods 0.000 title claims abstract description 30
- 230000008878 coupling Effects 0.000 title claims abstract description 29
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 29
- 238000002474 experimental method Methods 0.000 title claims abstract description 28
- 239000007787 solid Substances 0.000 title claims abstract description 17
- 238000004088 simulation Methods 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 120
- 238000011068 loading method Methods 0.000 claims abstract description 34
- 239000001301 oxygen Substances 0.000 claims abstract description 22
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000010521 absorption reaction Methods 0.000 claims abstract description 6
- 230000007246 mechanism Effects 0.000 claims abstract description 5
- 239000000523 sample Substances 0.000 claims description 28
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 15
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000006880 cross-coupling reaction Methods 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 238000004587 chromatography analysis Methods 0.000 claims 1
- 238000004590 computer program Methods 0.000 claims 1
- 230000002269 spontaneous effect Effects 0.000 abstract description 22
- 238000002485 combustion reaction Methods 0.000 abstract description 20
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 230000001808 coupling effect Effects 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract 1
- 238000010792 warming Methods 0.000 abstract 1
- 238000003795 desorption Methods 0.000 description 10
- 230000003647 oxidation Effects 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 239000011159 matrix material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000012806 monitoring device Methods 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000031068 symbiosis, encompassing mutualism through parasitism Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 240000005049 Prunus salicina Species 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001595 contractor effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 235000009018 li Nutrition 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels; Explosives
- G01N33/222—Solid fuels, e.g. coal
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention discloses a kind of experimental method for simulating the solid thermalization multi- scenarios method of coal body stream under Thermal-mechanical Coupling, comprise the following steps：It is prepared by coal sample；Load test specimen, coal sample gas absorption；Set moulded coal test specimen initial confined pressure, initial temperature and initial axial stress, and temperature and axial stress loading threshold value；Inject oxygen, the heating of moulded coal test specimen；First time data acquisition；Implement temperature and stress combination loading；Second of data acquisition；The chemical multi- scenarios method model of coal body seepage stress temperature is set up, the solid thermalization coupling mechanism of stream for disclosing coal body under Thermal-mechanical Coupling with reference to Numerical Method Study.The present invention realizes the spontaneous combustion warming law laboratory simulation under stress of coal seam loading, it can be used for stress-strain relation, the permeable sandstone of coal body and the coal oxygen reaction rule of the lower coal body of quantitative study Thermal-mechanical Coupling effect, determination for the prediction of Period of Coal Seam Spontaneous Combustion place and time, and spontaneous combustion optimal prevention and control opportunity provides foundation.
Description
Technical field
The present invention relates to the experimental method that a kind of simulation underground body of spontaneous combustion coal containing gas couples overall process, belong to colliery life
Gas control and fire Control Technology field in production.
Background technology
Coal resources in China natural endowment and long-term thriving demand cause coal exploitation with annual 10~25m speed to deep
Transfer, average mining depth is up to 700m or so, and the mine more than 1000m is up to 47 pairs.As mining depth increases, coal-bed gas contains
Amount and pressure constantly increase, ground temperature increase, and a large amount of superficial part gaseous mines upgrade to high methane even coal and gas outburst mine, no
Spontaneous fire seam is transformed into the even easy spontaneous progress of spontaneous combustion, causes gas and coal spontaneous combustion disaster intertexture symbiosis.It is right according to 2012
301 pairs of mines investigation in domestic emphasis colliery finds have 32.3% mine to be that gas and coal spontaneous combustion disaster symbiosis high methane are easy
Possible association oxidation of coal exothermic reaction phenomenon in spontaneous combustion mine, this type mine coal seam gas pumping, such as pre-control may not in time
Trigger coal spontaneous combustion even pipeline gas explosion risk.Implement concordant drilling such as the easy spontaneous combustion working face of certain high methane of ore deposit 13330 to take out in advance
During gas, by top adjacent coal seam mining influence, the coal body degree of crushing of coal road and borehole circumference is big, and gas pumping causes tunnel
Air is penetrated into coal body, triggers the oxygen-enriched aggregation in borehole circumference coal body fracture area, float coal oxidation heating.Detected greatly in drilling nose end
CO gases are measured, highest single hole CO concentration is 501ppm, is far longer than《Safe coal code》Defined 24ppm, causes more than 400
Drilling is urgent to be forced to close.
Degree and the result of many physical process couplings, mesh when gas and coal spontaneous combustion compound symbiotic disaster are multiple dimensioned, many
It is preceding still extremely to lack on coal petrography crack field, multicomponent gas diffusion-seepage field, coal-oxygen reactive chemistry and energy transmission
The experimental study of coupling relation between.The 70-80 ages in 20th century, foreign scholar J.Gawuga, V.V.Khodot,
The experts and scholars such as S.Harpalani have studied coal containing methane gas in the geophysical fields such as stress field, temperature field under experimental conditions
Gu mechanical property and On The Characters of Methane Seepage between stream-mechanics effect；20 th century laters, domestic scholars are fresh to learn good fortune academician, week
The peaceful academician of generation, Lin Baiquan professors, Zhaoyang rise professor, the firm professor of Japanese plum etc. with regard to the mechanical property of coal containing methane gas, deformation behaviour and oozed
Saturating characteristic etc. has carried out substantial amounts of experimental study；Then, taught with Yin Guangzhi, professor Xu Jiang etc. for representative domestic scholars, from
The main multi- scenarios method physical simulation experiment system that have developed coal-bed gas exploitation, to coal body under different gas pressures, different temperatures
Gas pumping parameter carries out physical analogy.But these above-mentioned experimental studies are mainly and simulate varying environment temperature to coal body power
The influence of characteristic, permeability and gas flowfield gas pumping is learned, the high temperature and high-ground stress of the actual preservation in coal seam are not related to
Under environment, coal-oxygen reaction heat release process of coal seam with gas lacks to adopting possible association in coal and rock crack field gas pumping
Coal spontaneous combustion, gas the experiment analytical method of secondary disaster such as fire.
The content of the invention
To solve the above problems, Gu the present invention provides a kind of simulation underground spontaneous combustion coal containing gas body stream-- many couplings of heat-change
The experimental method of overall process is closed, is that the exploitation of deep fractures under Thermal-mechanical Coupling environment and the prevention and control of disaster provide foundation.
To achieve these goals, present invention simulation underground spontaneous combustion coal containing gas body couples the experimental method of overall process,
Comprise the following steps：
Prepared by the first step, coal sample, type needed for by the way that experiment will be made after lump coal breaking-screening-molding-pressurization-drying
Coal；
Lump coal is ground into pulverized coal particle using disintegrating machine, and sieved；Then the pulverized coal particle after screening is added
A small amount of pure water, is poured into after stirring in moulded coal mould；And then mould is placed in it is compressing on forcing press, finally dry after
It is put into drying box standby；
Second step, loading test specimen, set initial confined pressure, initial temperature and the initial axial pressure of moulded coal test specimen, Yi Jiwen
The loading threshold value of degree and axial compressive force；
Moulded coal test specimen is fitted into the coal petrography core holder of experimental system, then using servo stress loading system to test specimen
Apply initial confined pressure and initial axial pressure, while presetting initial temperature value using temperature Loading Control System, initial confined pressure is
5MPa, initial temperature is 20 DEG C, and initial axial stress is 2MPa, and the temperature of setting and the loading threshold value of axial stress are respectively
200 DEG C and 10MPa；
3rd step, coal sample gas absorption；
The methane gas of constant pressure is injected into coal petrography core holder untill the stable outflow of gas is monitored, and then
Close the pipe valve that is connected with coal petrography core holder gas outlet, then after persistently inflating 48 hours, closing and coal petrography core holder
The connected pipe valve of air inlet；
4th step, injection oxygen, the heating of moulded coal test specimen；
Fixing axle pressure, confined pressure and temperature are kept after 10 minutes, injected into coal petrography core holder constant pressure oxygen or
Person's dry air 30 minutes；System is gradually heated up by temperature regulating device, and monitored by temperature measuring equipment inside coal petrography core holder
Specimen temperature changes；
5th step, first time data acquisition；
Collection coal body pressure, displacement and temperature data, are mixed while monitoring the multicomponent gas when temperature, pressure are constant in real time
The flow of resultant, and a multicomponent gas is collected at regular intervals, the chromatogram of multicomponent gas is carried out in subsequent two hours in time
Analysis.
6th step, Thermal-mechanical Coupling loading；
After step 3, fixed confined pressure keeps 5MPa constant, according to 0.5 DEG C/min and 0.001kN/s speed gradually to examination
Sample enters trip temperature and axle pressure combination loading；
7th step, second of data acquisition；
Often heat up 20 DEG C when keep constant temperature and fixing axle to press 10 minutes, carry out related data with reference to step 5 during this period
Monitoring and collection；
8th step, repeat step six, step 7 are until temperature loading threshold value reaches 200 DEG C or axial stress loading threshold value
10MPa is reached, one of above-mentioned condition is met and terminates experiment；
9th step, coal body seepage-stress-temperature-chemistry multi- scenarios method model is set up, taken off with reference to Numerical Method Study
Gu show stream-- heat-change coupling mechanism of coal body under Thermal-mechanical Coupling.
It is preferred that, particle diameter 0.18mm~0.38mm pulverized coal particle is taken in step one by Vibration Screen；During compacting tool set,
Mould is placed on rigid hydraulic press, applies 200KN axial load and pressurize 30 minutes；The sample of preparation is unified to polish
For high 100mm, diameter 50mm cylinder coal sample, the both ends of the surface depth of parallelism is less than 0.02mm.
Further, multicomponent gas is collected using airbag in step 5 and step 7, the multicomponent gas at least needs to receive
Collect three gas samples.
Further, a multicomponent gas was collected every 8 minutes in step 5；Collected once every 5 minutes in step 7
Multicomponent gas.
Further, in step 5, measured when the flow of multicomponent gas is smaller by flowmeter, the flow of multicomponent gas is larger
Shi Youqi drainage arrangements are measured, metering outfit needed for being selected by computer pre-set programs automatic decision；The component of gas and dense
Degree is detected by Agilent 7890B gas chromatographs.
Further, in step 9, coal body seepage-stress-temperature-chemistry multi- scenarios method model at least includes：Coal is deformed
Governing equation, coal-oxygen reactional equation, gas diffusion-osmotic control equation, energy transmission governing equation and cross-coupling control
Equation.
Further, the temperature regulating device in step 4 is the PTD instrument temperature controllers on coal petrography core holder；Thermometric
Device is the temperature probe inside coal petrography core holder.
Further, in step 6, temperature loading is realized by being located at the insulating box of coal petrography core holder outer end；Axle pressure
Loading acts on axle by axle press pump and pressed on piston, and active force is delivered into rock core end face.
Further, the collection of displacement data is by the sample surrounding in coal petrography core holder in step 5 and step 7
Different directions foil gauge be installed realized.
Further, ring pressure monitoring device, axle pressure monitoring device and displacement monitoring dress are also equipped with coal petrography core holder
Confined pressure, axle pressure and the displacement for putting to monitor moulded coal test specimen respectively.
The beneficial effects of the present invention are：
The present invention can experiment lab simulation underground spontaneous combustion coal body oxidation ramp case, record truly the stream of coal body-
Gu many PROCESS COUPLING effects of-heat-change, including the coal body strain-stress relation of coal body, permeability under different temperatures and stress become
Change, and the lower coal-oxygen of temperature loading accelerates flow and composition of the separated out multicomponent oxide gas of reaction and hydrocarbon gas etc.；
Coal sample is heated using the method for temperature programming, a series of coal body heating and oxidation data under different temperatures, solution are obtained
The oxidation cycle length of experimental solids coal body is generally up to the several months or even it is difficult to observes the difficulty of oxidative phenomena under nature of having determined
Topic, breaching traditional coal spontaneous combustion experiment is conducted a research using broken fine coal, realizes the oxidation of coal of flammable solid liable to sponta neous combustion containing gas
Dynamic (dynamical) experimental study；
Gu setting up includes stream-- heat-change coupling of gas-air multicomponent gas flowing feature and coal-oxygen reaction heat effect
Model, Binding experiment data can cooperate with cause calamity mechanism with coal spontaneous combustion by gas under quantitative description solid coal Thermal-mechanical Coupling environment, be
The co-development and damage control of coal and gas resources provide foundation under deep thermal coupling environment.
Brief description of the drawings
Fig. 1 is the FB(flow block) of the present invention；
Fig. 2 is the experimental system structural representation that the present invention is used；
Fig. 3 is coal seam with gas stream many coupling process schematics of solid thermalization of the present invention；
In figure：1st, gas cylinder I；2nd, valve I；3rd, pressure gauge I；4th, booster pump；5th, pipe valve I；6th, pressure-reducing valve；7th, ring pressure prison
Survey device；8th, moulded coal test specimen；9th, ess-strain device；10th, airbag；11st, gas mass flow gauge；12nd, drier；13rd, it is pneumatic
Valve；14th, condenser；15th, gas drainage arrangement；16th, gas outlet valve；17th, displacement monitor；18th, axle pressure monitoring device；19、
Temperature regulating device；20th, insulating box；21st, standard chamber；22nd, air intake valve II；23rd, injection pump；24th, gas cylinder II；25th, valve II；26、
Pressure gauge II；27th, high pressure gas storage tank；28th, coal petrography core holder；29th, pressure control valve.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
By taking the experimental system in Fig. 2 as an example, a kind of simulation underground body of spontaneous combustion coal containing gas couples the experiment side of overall process
Method, as shown in figure 1, comprising the following steps：
Prepared by the first step, coal sample, lump coal is ground into pulverized coal particle using disintegrating machine, particle diameter is taken by Vibration Screen
0.18mm~0.38mm pulverized coal particle；Pulverized coal particle 300g for screening out or so is weighed, a small amount of pure water is added, stirs
After pour into moulded coal mould；Mould is placed on rigid hydraulic press, applies 200KN axial load and pressurize 30 minutes,
It will suppress and be taken out after successful moulded coal coal sample reverse mould, and be put into drying box after drying standby；The unified polishing of the sample of preparation is height
100mm, diameter 50mm cylinder coal sample, the both ends of the surface depth of parallelism are less than 0.02mm.
Second step, loading test specimen, set initial confined pressure, initial temperature and the initial axial pressure of moulded coal test specimen, Yi Jiwen
The loading threshold value of degree and axial compressive force；
It is by the loading coal rock core fastener 28 of moulded coal test specimen 8 of preparation, pressing monitoring device 7 to preset initial confined pressure by ring
5MPa, initial temperature is set as 20 DEG C by temperature regulating device 19, and using axle pressure monitoring device 18 set initial axial pressure as
2MPa, the temperature of setting and the loading threshold value of axial compressive force are respectively 200 DEG C and 10MPa.
3rd step, coal sample gas absorption；Concrete operations are as follows：
Coal petrography core holder 28 is embedded with gas gas source pipe hole, closes air intake valve 22 and pressure control valve 29, opens valve
I2 and pipe valve I5, is stored in high pressure gas storage tank 27 after the methane gas in gas cylinder I1 is pressurizeed by booster pump 4,
Injected into standard chamber 21 after gas 1MPa, close pressure-reducing valve 6, pressure control valve 29 is opened, by controlling to coal petrography core holder
The methane gas of more than 0.5MPa constant pressures is injected in 28 after 30 minutes or until monitors that gas is steady by graduated cylinder or beaker
Untill constant current goes out, the outlet valve 16 that is connected with the gas outlet of coal petrography core holder 28 is closed, then persistently inflationtime after 48 hours,
Close the pipe valve I5 being connected with coal petrography core holder air inlet.
4th step, injection oxygen, the heating of moulded coal test specimen；Keep fixing axle pressure, confined pressure and temperature after 10 minutes, open valve
II25, the dry air or oxygen in gas cylinder II24 are pressurizeed by injection pump 23, and open air intake valve 22 to coal petrography core folder
Constant pressure dry air or oxygen are injected in holder 28, the injection pump 23 has communication interface, can inject gas by programme-control
The flow and pressure of body；The inside of rock core fastener 28 controls to heat up by PTD instrument temperature controller, and by installed in coal petrography core
Temperature probe inside clamper monitors situation under the temperature change of moulded coal test specimen at any time.
5th step, first time data acquisition；
Gather coal body pressure in real time using pressure sensor；The different directions of the surrounding of moulded coal test specimen 8 in coal petrography core holder
Foil gauge is installed, the change of coal sample top offset is converted into resistance variations and strain data is obtained by tester；Pass through coal
Temperature probe collection specimen temperature data inside rock core fastener；When temperature, pressure are constant, the multicomponent gas of desorption is monitored
Flow, and collect using every 8 minutes of airbag the gas sample of a multicomponent gas, at least collect gas sample three times；After collection in 2 hours
Multicomponent gas chromatography is carried out in time；The gas composition and content of data and the chromatograph detection of collection.Data record is joined
Examine following Experiment Data Records table；
The main low discharge using gas drainage arrangement 15 of metering of the multicomponent gas flow of desorption measures gentle weight stream
The Large flow of gauge 11, concrete operations are as follows：
Open pneumatic operated valve 13, reduction outlet pressure to requirement of experiment pressure, desorption gas through pneumatic operated valve 13, condenser 14,
Drier 12, then calculates the stripping gas scale of construction by gas mass flow gauge 11；When flow is smaller, programme-control pneumatic operated valve 13 is certainly
Dynamic be switched to is measured by gas drainage arrangement 15；Gas is collected by airbag 10, and its component and concentration pass through Agilent 7890B gas phase colors
Spectrometer is detected；
The condenser 14 that back pressure exit is installed is mainly used in fluid cooling, prevents exit fluid temperature too high, vapor
Desorption gas discharge is taken as, so as to cause error in dipping；The effect of drier 12 is the moisture content in adsorption-desorption gas, anti-major structure
Damaged into gas flowmeter.
6th step, Thermal-mechanical Coupling loading；
The outer end of coal petrography core holder 28 is provided with insulating box 20, opens insulating box 20, and fixed confined pressure keeps 5MPa constant, passed through
Temperature needed for temperature is transferred to experiment by communication port on temperature controller, after carrying solution to be pressurised by axle press pump after temperature plateau
For power, motive fluid acts on axle pressure piston, and axle pressure piston transfers the force to the moulded coal examination in coal petrography core holder 28
Part 8 is pressurizeed, and temperature and axial stress loading threshold value are respectively 200oC and 10MPa, and the speed of combination loading is 0.5 respectively
DEG C/min and 0.001kN/s.
7th step, second of data acquisition；Often heat up 20 DEG C when keep constant temperature and fixing axle to press 10 minutes, join during this period
The monitoring and collection of related data are carried out according to step 5, the wherein gas sample of multicomponent gas was gathered once every 5 minutes.
8th step, repeat step six, step 7 are until temperature loading threshold value reaches 200 DEG C or axial stress loading threshold value
10MPa is reached, one of above-mentioned condition is met and terminates experiment.
9th step, coal body seepage-stress-temperature-chemistry multi- scenarios method model is set up, taken off with reference to Numerical Method Study
Gu show stream-- heat-change coupling mechanism of coal body under Thermal-mechanical Coupling；Its coal deformation, matrix desorption of mash gas-diffusion, crack are empty
The multi- scenarios method model such as gas-gas mixed flow and the transmission of oxidation of coal thermal energy is as shown in figure 3, specific calculating process is as follows：
(1) coal Deformation control equation
Consider thermal expansion/contraction effect, matrix expansion/blockage effect and pore pressure to change, non-isothermal coal body sheet
Structure equation can be expressed as：
In formula：G=E/2 (1+ υ), K=E/3 (1-2 υ), α=1-K/Ks, εs=εLVsg。
Following table i, j is direction coordinate (can represent x, y and z direction), and G is the modulus of shearing (MPa) of coal, K, KsRespectively
For the bulk modulus (MPa) of coal and coal particle, E, EsThe respectively Young's modulus (MPa) of coal and coal particle, υ is the Poisson of coal
Than α is Biot coefficients, and α T are the thermal coefficient of expansion (K of coal particle-1), pf is the gas pressure (MPa) of cleat in coal, and T is temperature
(K), fiAnd ui(i=x, y, z) is respectively the muscle power (N/m in i directions3) and displacement (m), εsThe body caused by gas absorption/desorption
Product strain, εLFor the bulk strain of coal under limiting pressure, VsgContain coefficient of discharge for the adsorbed gas of amendment：
In formula：pmFor the pressure (MPa) of gas in matrix of coal, TarFor gas absorption/desorption reference temperature (K), PLFor ginseng
Examine temperature TarWhen gas Langmuir pressure-constants (MPa), c1And c2Respectively pressure coefficient (MPa-1) and temperature coefficient (K-1)。
(2) coal-oxygen reactional equation
Coal oxygen reactive chemistry equation is Coal(s)+O2(g)→CO2(g)+CO(g)+H2O(g)+Oxy-Coal(s)+heat.Coal oxygen
Change reaction speedIt is expressed as using the simple Arrhenius equations of single order：
In formula：A is pre-exponential factor (s-1), EaFor activation energy (kJ/mol),For the concentration (mol/m of oxygen3), R is logical
With gas constant (J/ (molK)), T is coal temperature.
Oxygen components mass transmission equation can be expressed as in porous media：
In formula：D is oxygen molecule diffusion coefficient (m2/s)。
(3) gas diffusion-osmotic control equation
Matrix of coal and fissure system gas transport equation are respectively：
In formula：Following table " m " and " f " represent coal body matrix system and coalmass crevasse system respectively, and p represents Fluid pressure
(Pa), VLFor reference temperature TarWhen corresponding gas Langmuir volume constants (m3/ kg), ρsFor the density (kg/m of coal3), pa
And TaThe pressure (MPa) and temperature (K) of gas respectively under mark condition, τ is desorption of mash gas-diffusion time (s), and t is time (s), τ
For desorption of mash gas-diffusion time (s), φ is the porosity of coal, and k is the porosity (m of coal2), μ is the average power viscosity of gas
Coefficient (Ns/m2)。
(4) energy transmission governing equation：Energy-balance equation between gas and coal particle can be expressed as：
In formula：(ρcp)eff=(1- φ) ρscps+φρfcpf, κeff=(1- φ) κs+φκf,κeffTo be each
To the size fractal dimension (J/ (msK)) of same sex porous media system, (ρ cp)effFor effective heat capacity (J/ (kgK)),
QT is oxidation of coal heat generation (J/ (m3S)), QHThe oxidation generation of coal is hot (J/mol) during for consumption unit molal weight oxygen.
(5) coal body porosity evolution model
Consider matrix of coal expansion and Coal matrix shrinkage effect caused by desorption of mash gas, coal porosity caused by coal spontaneous combustion heating
Evolutionary model can be rewritten as：
φ=α-(α-φ0)exp(S0-S)
In formula：S=εV+pf/Ks-αTT-εs, S0=εV0+pf0/Ks-αTT0-εs0。εVFor the bulk strain of coal, subscript " 0 " is
The original state of relevant variable.
Claims (9)
1. a kind of experimental method for simulating the solid thermalization multi- scenarios method of coal body stream under Thermal-mechanical Coupling, it is characterised in that including following step
Suddenly：
Prepared by the first step, coal sample, moulded coal needed for by the way that experiment will be made after lump coal breaking-screening-molding-pressurization-drying；
Lump coal is ground into pulverized coal particle using disintegrating machine, and sieved；Then the pulverized coal particle after screening is added a small amount of
Pure water, is poured into after stirring in moulded coal mould；And then mould is placed in it is compressing on forcing press, finally dry after be put into
Drying box is standby；
Second step, load test specimen, set moulded coal test specimen initial confined pressure, initial temperature and initial axial pressure, and temperature and
The loading threshold value of axial compressive force；
Moulded coal test specimen is fitted into the coal petrography core holder of experimental system, then test specimen applied using servo stress loading system
Initial confined pressure and initial axial pressure, while presetting initial temperature value using temperature Loading Control System, initial confined pressure is 5MPa,
Initial temperature is 20 DEG C, and initial axial pressure is 2MPa, the temperature of setting and the loading threshold value of axial compressive force be respectively 200 DEG C and
10MPa；
3rd step, coal sample gas absorption；
The methane gas of constant pressure is injected into coal petrography core holder untill the stable outflow of gas is monitored, and then is closed
The pipe valve being connected with coal petrography core holder gas outlet, then persistently inflate 48 hours after, close with coal petrography core holder air inlet
The connected pipe valve of mouth；
4th step, injection oxygen, the heating of moulded coal test specimen；
Fixing axle pressure, confined pressure and temperature are kept after 10 minutes, the oxygen or dry of constant pressure is injected into coal petrography core holder
Air 30 minutes；System is gradually heated up by temperature regulating device, and sample inside coal petrography core holder is monitored by temperature measuring equipment
Temperature change；
5th step, first time data acquisition；
Coal body pressure, displacement and temperature data are gathered in real time, while the stream of monitoring multicomponent gas when temperature, pressure are constant
Amount, and a multicomponent gas is collected at regular intervals, the chromatography of multicomponent gas is carried out in subsequent two hours in time.
6th step, Thermal-mechanical Coupling loading；
After step 2, fixed confined pressure keeps 5MPa constant, and gradually sample is entered according to 0.5 DEG C/min and 0.001kN/s speed
Trip temperature and axle pressure combination loading；
7th step, second of data acquisition；
Often heat up 20 DEG C when keep constant temperature and fixing axle to press 10 minutes, the monitoring of related data is carried out with reference to step 5 during this period
And collection；
8th step, repeat step six, step 7 until temperature loading threshold value reach 200 DEG C or axial compressive force loading threshold value reach
10MPa, meets one of above-mentioned condition and terminates experiment；
9th step, coal body seepage-stress-temperature-chemistry multi- scenarios method model is set up, heat is disclosed with reference to Numerical Method Study
Gu couple of force closes stream-- heat-change coupling mechanism of lower coal body.
2. the experimental method of the solid thermalization multi- scenarios method of coal body stream under analogsimulation Thermal-mechanical Coupling according to claim 1, its
It is characterised by, takes particle diameter 0.18mm~0.38mm pulverized coal particle in step one by Vibration Screen；During compacting tool set, by mould
It is placed on rigid hydraulic press, applies 200KN axial load and pressurize 30 minutes；The unified polishing of the sample of preparation is height
100mm, diameter 50mm cylinder coal sample, the both ends of the surface depth of parallelism are less than 0.02mm.
3. the experimental method of the solid thermalization multi- scenarios method of coal body stream, its feature under simulation Thermal-mechanical Coupling according to claim 1
It is, collect multicomponent gas using needle tubing or bladders in step 5 and step 7, the multicomponent gas at least needs to collect three times
Gas sample.
4. the experimental method of the solid thermalization multi- scenarios method of coal body stream, its feature under simulation Thermal-mechanical Coupling according to claim 1
It is, a multicomponent gas was collected every 8 minutes in step 5；In step 7 a multicomponent gas was collected every 5 minutes.
5. the experimental method of the solid thermalization multi- scenarios method of coal body stream, its feature under simulation Thermal-mechanical Coupling according to claim 1
It is, in step 5, is measured when the flow of multicomponent gas is smaller by flowmeter, is filled when the flow of multicomponent gas is larger by gas draining
Metering is put, metering outfit needed for being selected by computer program automatic decision；The component and concentration of gas pass through Agilent 7890B
Gas chromatograph is detected.
6. the experimental method of the solid thermalization multi- scenarios method of coal body stream, its feature under simulation Thermal-mechanical Coupling according to claim 1
It is, in step 9, coal body seepage-stress-temperature-chemistry multi- scenarios method model at least includes：Coal Deformation control equation, coal-
Oxygen reactional equation, gas diffusion-osmotic control equation, energy transmission governing equation and cross-coupling control equation.
7. the solid thermalization multi- scenarios method of coal body stream under the simulation Thermal-mechanical Coupling according to claim 1 to 6 any claim
Experimental method, it is characterised in that the temperature regulating device in step 4 is the PTD instrument temperature controllers on coal petrography core holder；
Temperature measuring equipment is the temperature probe inside coal petrography core holder.
8. the experimental method of the solid thermalization multi- scenarios method of coal body stream, its feature under simulation Thermal-mechanical Coupling according to claim 7
It is, in step 6, temperature loading is realized by being located at the insulating box of coal petrography core holder outer end；Axle pressure loading passes through axle pressure
Active force is delivered to rock core end face by pumping action on axle pressure piston.
9. the experimental method of the solid thermalization multi- scenarios method of coal body stream, its feature under simulation Thermal-mechanical Coupling according to claim 8
It is, the collection of displacement data is pacified by the different directions of the sample surrounding in coal petrography core holder in step 5 and step 7
Foil gauge is filled to realize.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710148515.XA CN107064450B (en) | 2017-03-14 | 2017-03-14 | Coal body stream consolidates the experimental method of thermalization multi- scenarios method under a kind of simulation Thermal-mechanical Coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710148515.XA CN107064450B (en) | 2017-03-14 | 2017-03-14 | Coal body stream consolidates the experimental method of thermalization multi- scenarios method under a kind of simulation Thermal-mechanical Coupling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107064450A true CN107064450A (en) | 2017-08-18 |
| CN107064450B CN107064450B (en) | 2019-04-26 |
Family
ID=59622057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710148515.XA Active CN107064450B (en) | 2017-03-14 | 2017-03-14 | Coal body stream consolidates the experimental method of thermalization multi- scenarios method under a kind of simulation Thermal-mechanical Coupling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107064450B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107957374A (en) * | 2017-12-27 | 2018-04-24 | 中国矿业大学 | Coal body loading property influences analogue experiment installation and method under a kind of constraints |
| CN108362564A (en) * | 2018-01-16 | 2018-08-03 | 西安科技大学 | The big mine pressure coal and rock breakage of simulation High-geotemperature uses experimental system and its method certainly |
| CN108416101A (en) * | 2018-02-05 | 2018-08-17 | 山东理工大学 | A kind of hub drive system multi- scenarios method modeling method |
| CN111015370A (en) * | 2019-11-11 | 2020-04-17 | 华侨大学 | Grinding monitoring method based on thermal coupling |
| CN112647899A (en) * | 2020-12-30 | 2021-04-13 | 太原理工大学 | Coal bed gas exploitation comprehensive utilization numerical simulation method |
| CN114441407A (en) * | 2022-01-14 | 2022-05-06 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | Hypotonic coal rock CO2Dynamic visual simulation test system and method for displacement process |
| AU2022202272B2 (en) * | 2021-06-30 | 2023-03-23 | China Coal Technology & Engineering Group | Gas detection device and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101206211A (en) * | 2007-12-18 | 2008-06-25 | 中国矿业大学 | Method for determining coal ignitability |
| CN103344537A (en) * | 2013-06-05 | 2013-10-09 | 太原理工大学 | Test method for high-temperature high-pressure pyrolysis reaction |
| CN103760027A (en) * | 2014-01-02 | 2014-04-30 | 重庆大学 | Continuous and constant pressure rheological test device for coal rocks |
| CN103915018A (en) * | 2014-04-30 | 2014-07-09 | 辽宁工程技术大学 | Coal rock three-shaft loading slow pyroelectric detection experiment device and experiment method thereof |
| CN105548519A (en) * | 2016-01-17 | 2016-05-04 | 西安科技大学 | Coalfield fire evolution process similarity simulation test device and method |
-
2017
- 2017-03-14 CN CN201710148515.XA patent/CN107064450B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101206211A (en) * | 2007-12-18 | 2008-06-25 | 中国矿业大学 | Method for determining coal ignitability |
| CN103344537A (en) * | 2013-06-05 | 2013-10-09 | 太原理工大学 | Test method for high-temperature high-pressure pyrolysis reaction |
| CN103760027A (en) * | 2014-01-02 | 2014-04-30 | 重庆大学 | Continuous and constant pressure rheological test device for coal rocks |
| CN103915018A (en) * | 2014-04-30 | 2014-07-09 | 辽宁工程技术大学 | Coal rock three-shaft loading slow pyroelectric detection experiment device and experiment method thereof |
| CN105548519A (en) * | 2016-01-17 | 2016-05-04 | 西安科技大学 | Coalfield fire evolution process similarity simulation test device and method |
Non-Patent Citations (2)
| Title |
|---|
| 夏同强: "瓦斯与煤自燃多场耦合致灾机理研究", 《中国博士学位论文全文数据库 工程科技I辑》 * |
| 杨胜强等: "高瓦斯易自燃煤层瓦斯与自燃复合致灾机理研究", 《煤炭学报》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107957374A (en) * | 2017-12-27 | 2018-04-24 | 中国矿业大学 | Coal body loading property influences analogue experiment installation and method under a kind of constraints |
| CN108362564A (en) * | 2018-01-16 | 2018-08-03 | 西安科技大学 | The big mine pressure coal and rock breakage of simulation High-geotemperature uses experimental system and its method certainly |
| CN108362564B (en) * | 2018-01-16 | 2020-07-07 | 西安科技大学 | Experimental system and method for simulating high-ground-temperature large-ore-pressure coal rock mass damage spontaneous combustion |
| CN108416101A (en) * | 2018-02-05 | 2018-08-17 | 山东理工大学 | A kind of hub drive system multi- scenarios method modeling method |
| CN111015370A (en) * | 2019-11-11 | 2020-04-17 | 华侨大学 | Grinding monitoring method based on thermal coupling |
| CN112647899A (en) * | 2020-12-30 | 2021-04-13 | 太原理工大学 | Coal bed gas exploitation comprehensive utilization numerical simulation method |
| AU2022202272B2 (en) * | 2021-06-30 | 2023-03-23 | China Coal Technology & Engineering Group | Gas detection device and method |
| CN114441407A (en) * | 2022-01-14 | 2022-05-06 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | Hypotonic coal rock CO2Dynamic visual simulation test system and method for displacement process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107064450B (en) | 2019-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107064450B (en) | Coal body stream consolidates the experimental method of thermalization multi- scenarios method under a kind of simulation Thermal-mechanical Coupling | |
| Li et al. | Variation in permeability during CO2–CH4 displacement in coal seams: part 1–experimental insights | |
| Fan et al. | Thermo-hydro-mechanical-chemical couplings controlling CH4 production and CO2 sequestration in enhanced coalbed methane recovery | |
| Bai et al. | Effect of CO2 injection on CH4 desorption rate in poor permeability coal seams: An experimental study | |
| Wei et al. | Liquid CO2 injection to enhance coalbed methane recovery: An experiment and in-situ application test | |
| CN106840991B (en) | A kind of Unconventional gas rock-more PROCESS COUPLING pilot systems of gas-heat | |
| Teng et al. | A fully coupled thermo-hydro-mechanical model for heat and gas transfer in thermal stimulation enhanced coal seam gas recovery | |
| Harpalani et al. | Influence of gas production induced volumetric strain on permeability of coal | |
| Chu et al. | Experimental investigation on the permeability evolution of compacted broken coal | |
| Zhang et al. | Influence of coal particle size on coal adsorption and desorption characteristics | |
| Niu et al. | Experimental study of permeability changes and its influencing factors with CO2 injection in coal | |
| Zhang et al. | Laboratory experiments of CO2-enhanced coalbed methane recovery considering CO2 sequestration in a coal seam | |
| CN202339307U (en) | Device for determining water adsorption and diffusion coefficient of mud shale | |
| Hu et al. | Effects of gas adsorption on mechanical properties and erosion mechanism of coal | |
| Li et al. | LCO2-ECBM technology for preventing coal and gas outburst: Integrated effect of permeability improvement and gas displacement | |
| Shi et al. | Competitive methane desorption by supercritical CO 2 injection in coal | |
| Zhang et al. | Damage evolution and post-peak gas permeability of raw coal under loading and unloading conditions | |
| CN105699273A (en) | Testing device and method of desorption and seepage of steam driven coal mass methane | |
| Chen et al. | Experimental investigation of coal-like materials for hydraulic fracturing based on fluid-solid interaction | |
| Pang et al. | Measurement of the coefficient of seepage characteristics in pore-crushed coal bodies around gas extraction boreholes | |
| Wang et al. | Temperature-pressure coupling effect on gas desorption characteristics in coal during low-variable temperature process | |
| M'Jahad et al. | Characterization of transport and water retention properties of damaged Callovo-Oxfordian claystone | |
| Ye et al. | Relationship between desorption amount and temperature variation in the process of coal gas desorption | |
| Li et al. | Investigation of gas displacement efficiency and storage capability for enhanced CH4 recovery and CO2 sequestration | |
| CN205719852U (en) | CO2displacement shale gas and shale are to shale gas or CO2absorption analytic simulation test device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: No. 1, Tongshan University Road, Xuzhou, Jiangsu Province, Jiangsu Applicant after: China University of Mining & Technology Address before: 221000 Xuzhou University Road, Jiangsu, No. 1 Applicant before: China University of Mining & Technology |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |