CN104316668B - Adopt dynamic deformation coal body oxidation characteristic test device in deep - Google Patents
Adopt dynamic deformation coal body oxidation characteristic test device in deep Download PDFInfo
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Abstract
Dynamic deformation coal body oxidation characteristic test device is adopted the present invention relates to deep, and in particular to high stress, high-temperature, high gas flow pressure, gas concentration and flow and high intensity adopt spontaneous combustionof coal oxidation characteristic test device under the multiple complex environment of dynamic deformation.Described device is made up of circular cavity, hydraulic control system, gas source control system and gas sampling system.It is characterized in that, circular cavity outside and hydraulic control system, gas source control system and gas sampling system connection, intact coal sample will be prepared during experiment to be put into circular cavity, adjust the pressure and temperature in cavity, chamber experiment in vivo coal sample is set to meet the environmental effect in actual coal seam, then the gas concentration of air supply system is adjusted, flow and pressure, open the source of the gas that air intake valve provides setting to experiment coal sample, open outlet valve and gather release gas and temperature conditions, and the change of experiment coal sample internal temperature and ess-strain parameter, for this, the oxidation characteristic of dynamic deformation coal body is adopted in analysis.
Description
Technical field
Dynamic deformation coal body oxidation characteristic test device is adopted the present invention relates to deep, the device is prevention and control of mine disaster field,
Specifically related to high stress, high-temperature, high gas flow pressure and high intensity adopt spontaneous combustionof coal under the multiple complex environment of dynamic deformation
Oxidation characteristic is tested.
Background technology
Coal industry is the basic industry of China, and coal accounts for 70% or so in China's primary energy production and consumption structure.
The storage capacity of total situation either shallow of current China's coal-mine exploitation is on the low side, and the depth gross reserves more than km is accounted for must compare many,
According to Investigation on Data, the reserves of depth account for more than the 70% of total amount.As gradually decreasing for superficial part coal resources is even exhausted,
Turn into trend to deep mining.According to related data, it is 800 ~ 1500m that the depth of China's coal-mine deep resource exploitation, which is delimited,.I
The mean depth that state's deep mining development trend was exploited from China's coal-mine in 1980 is 288m, and nineteen ninety-five reaches 428m, 20th century
Last coal mining depth nearly 500m, mining depth in 2005 has averagely reached 700m, and coal mining depth is with annual
10~20m speed increase, many mines of China have been enter into the deep mining of 800m to 1500m depth in current coal mining.
Complicated geological environment residing for deep mining, coal and rock is in high-ground stress, High-geotemperature, high pore pressure and high intensity disturbance
State in, cause easy deep Conflagration Caused by Coal Self-ignition to be on the rise.Furthermore, spontaneous combustion occurs for China's superficial part coal seam all the time all
Very serious, the mine according to statistics, in China's State owned coal mine with the dangerous coal seam of easy spontaneous fire accounts for 56%, and coal is certainly
Combustion is to cause the principal element of mine fire, and more than 90% mine fire is that as caused by spontaneous combustionof coal, spontaneous combustionof coal turns into ore deposit
The major casualty of well.However as mining depth increase, ground temperature, press linearly increasing, the degree of fragmentation and plasticity of coal and rock increase
Greatly, mechanical property of coal seam changes, and coal body mesopore will develop, and develop, deform and insertion, the seepage flow diffusion enhancing of gas,
Significant changes will occur for the oxygen uptake characteristic of coal, the accumulation release rule and accumulation of heat environment of heat, cause deep mining operation coal
Ignition quality is substantially different from shallow mining coal seam, and spontaneous combustion process, oxidation characteristic and Prevention Technique will become more complicated.
At present, the challenge showed for deep mining operation spontaneous combustionof coal, the experimental provision for not having correlation can expire
The test of sufficient deep mining complex condition Coal Spontaneous Combustion Characteristics, it is impossible to adapt to the actual conditions of deep coal mining.
The content of the invention
The purpose of the present invention is to realize that Coal Spontaneous Combustion Characteristics method of testing can there is provided a kind of means in deep mining operation
Lean on, rational in infrastructure, method is easy, and measurement is accurate, data visualization, good test effect meets deep fractures occurrence condition and opened
The test device for adopting dynamic deformation coal body oxidation characteristic during adopting.
Technical scheme：
Dynamic deformation coal body oxidation characteristic test device is adopted in the deep of the present invention, and the device is by circular cavity, hydraulic control system
System, temperature control system, gas source control system and gas sampling system composition.It is characterized in that：Circular cavity is by after preparation
Coal sample be put into cavity, pre-buried fibre optic temperature sensor and fibre optic strain sensor inside coal sample, to coal sample and porous backing plate
Heat-shrink tube is put, and sets up foil gauge, is then placed in circular cavity, cavity lid is covered, strategy parameter is set according to experiment
Start to inject hydraulic oil into cavity, the pressure in regulation hydraulic control system control chamber body passes through temperature control system control
Temperature in cavity so that the experiment coal sample in cavity meets the environmental effect in deep mining coal seam, while adjusting air supply system
The air mass flow and gas pressure parameter controlled, by the CO discharged in data collecting system samples of coal pulled experimentation, O2,
The parameters such as CH4, CO2, C2H4 and temperature variations, and the change of experiment coal sample internal temperature and ess-strain parameter, according to
Coal body oxidation characteristic in these Parameter analysis and research deep mining coal deformation process.
Described circular cavity is that cavity is made up of body cavity and cavity lid, in cavity with closed and compressive property
A number of gas passage is provided with portion's base porous backing plate under being, porous backing plate, and is connected with air inlet pipe；In cavity
Portion top is connected there is also upper porous backing plate with outlet pipe road.Under porous backing plate fixed by gim peg, test coal sample peace
It is placed between porous backing plate up and down, it is outside preset fibre optic strain sensor and fibre optic temperature sensor, coal sample and many inside coal sample
The hole backing plate set pyrocondensation seal of tube.
Described hydraulic control system is to inject hydraulic oil in circular cavity by in-line, is that coal sample applies coal seam
Stress needed for environmental effect, its size is obtained by pressure gauge；Hydraulic oil is flowed back and reduced by return line during release simultaneously
Pressure in circular cavity.
Described temperature control system is that heating collar, the temperature fed back according to inside cavity are covered outside circular cavity
Value, is automatically adjusted by temperature control system, the temperature needed for being tested.
Described gas source control system is that to provide required oxygen concentration, gas pressure and flow for experiment coal sample big
Small, it is controlled by delicate flow meter according to the experiment condition of setting, and set condition is provided for experiment coal sample.
Described gas sampling system is to discharge gas to adopting after dynamic deformation coal sample heating and oxidation and be monitored, main prison
It is parameter and the temperature conditions such as CO, O2, CH4, CO2, C2H4 to survey index, and its automatic data collection is the reality of comparative analysis different set
Gas release characteristics and rule under the conditions of testing, and relation is made deeper into researching and analysing between experiment coal sample deformation characteristic.
Adopt dynamic deformation coal body oxidation characteristic method of testing in the deep of the present invention：
A, the raw coal sample prepared carries out to internal preset fibre optic strain sensor and temperature sensor, and above and below being placed in
Between two porous backing plates, then heat-shrink tube carries out coal sample to seal tight, needs to stick outside sample according to experiment and answers
Become piece, be then placed in circular cavity, the porous backing plate of firm banking, set up circular cavity capping, and seal intact.
B, the pressure size injected by hydraulic control system into circular cavity in hydraulic oil, pressure gauge monitoring cavity,
When reaching the stress value set by experimental program, oil inlet valve is closed, coal sample is placed in corresponding ambient stress.
C, the peripheral heating collar of regulation circular cavity, and the temperature obtained by temperature control system set by inside cavity is big
It is small, coal sample is placed in corresponding temperature environment.
D, according to set experimental program, regulate the flow and pressure size needed for delicate flow meter, start simultaneously
Gas sampling system, temperature acquisition system and ess-strain acquisition system.
E, after all control systems have all been debugged, start acquisition system, open air intake valve and outlet valve, and in reality
Cavity internal stress is increased or decreased according to the requirement of experiment setting during testing, coal body is occurred different degrees of deformation, and oxygen
Change spontaneous combustion.
F, according to experiment needs, carry out under different stress, different temperatures environment, gas with various pressure condition coal deformation and
Test experiments are aoxidized, are entered according to the parameter such as the gas componant and concentration of collection, coal body internal temperature and deformation, temperature of exhaust gas
Coal deformation and oxidation characteristic under row analysis, research deep mining environment.
The beneficial effects of the invention are as follows：
From the above mentioned, apparatus of the present invention are to realize that the test of coal body oxidation characteristic during coal seam deformation is adopted in deep, are led to
Cross to the pressure and temperature setting in circular cavity, juxtaposition coal sample passes through the delicate flow instrument control gas in air inlet pipe in wherein
Body flow and pressure, the pressure for changing hydraulic oil in cavity obtain stress in coal bed strain and deform disrumpent feelings degree, in different distortion
During coal body occur crack develop with different pressures, various concentrations oxygen interact, the index gas composition discharged
Will be each variant with concentration, by analyzing the parameter monitored, obtain under deep fractures environmental effect in mining active process
Coal body Oxidation Law, discloses deep mining coal internal modification, crack evolution Feature and its to Oxygen Adsorption percolation law, so that
Preventing and treating for deep mining spontaneous combustion of coal seam provides theoretical direction.
Thus apparatus of the present invention can meet the survey that deep mining adopts coal body oxidation characteristic during coal seam deformation completely
Examination is required, innovatively proposes test device, fills up the demand to experimental provision in research deep Coal Self-ignition Process.The device
Rational in infrastructure, operation is easy, and method of testing is easy, technically reliable, and measurement accuracy is high, and method is easily grasped, automatic data collection and
Visualization, cost is low, with wide applicability and application value.
Brief description of the drawings
Fig. 1 is the general structure schematic diagram of apparatus of the present invention.Wherein there are gas source control system 1, air inlet pipeline control valve
2nd, delicate flow meter 3, air inlet pipeline 4, air inlet pipeline joint 5, air inlet connecting mouth 6, circular cavity 7, foil gauge 8, hydraulic oil 9, plus
Gas ket 10, cavity interface 11, cavity lid 12, upper porous backing plate 13, outlet connect mouth 14, outlet pipe joint 15, outlet pipe control
Valve 16 processed, gas sampling system 17, optical fiber stress sensor 18, closed heat-shrink tube 19, experiment coal sample 20, optical fiber sensing
Device 21, thermocouple 22, pressure gauge 23, temperature control system 24, oil-feed control valve 25, oil return control valve 26, lower porous pad
Plate 27, gim peg 28, in-line 29, return line 30, hydraulic control system 31, data collecting card 32.
Embodiment
The embodiment that dynamic deformation coal body oxidation characteristic test device is adopted in deep of the invention is made into one below in conjunction with the accompanying drawings
The description of step：
Dynamic deformation coal body oxidation characteristic test device is adopted in the deep of the present invention, and it is former that standard cylindrical type is made according to experimental provision
Coal sample（ø50mm×100 mm）, the processing and processing of preset fibre optic strain sensor and temperature sensor are carried out to raw coal sample, so
Coal sample is placed on the porous backing plate (50mm) of base afterwards, heat-shrink tube is sleeved in coal sample and porous backing plate, top is being laid
Porous backing plate, shrink process is carried out using hair dryer to heat-shrink tube, makes heat-shrink tube that tightly coal sample be carried out to seal tight, experiment
Foil gauge is set up outside coal sample, and coal sample is placed in cavity by the gim peg position inside circular cavity, circular cavity is covered
The capping of body, and check the air-tightness of whole inside cavity, it is ensured that sealing is intact.Start the hydraulic pump of hydraulic control system, beat
Oil inlet valve is opened, starts to inject hydraulic oil into cavity, the pressure needed for the pressure that pressure gauge is monitored in cavity reaches experiment
During value, oil inlet valve is closed, experiment coal sample is in the pressure value environment of setting, coal body is deformed compressed.Then open
The heating collar of dynamic circular cavity periphery, the temperature value set by regulation temperature control system, and the temperature constant always, make experiment coal sample
In temperature value environment in setting, coal body is because of the heated change that will occur microstructure.Subsequent start-up gas source control system, is adjusted
The flow and pressure size needed for delicate flow meter have been saved, and has debugged all acquisition systems, can have been carried out by two ways
Experiment, one：Pressure and temperature in constant cavity, opens air intake valve and outlet valve, carries out the coal body oxygen under the conditions of this
Change experiment；Second, pressure in removal cavity obtain coal mass relief deformation, crack produce, insertion and disrumpent feelings, or according to experiment need
Change the temperature in cavity, open the air intake valve and drain tap of air supply system.Experimental period can be according to setting
Experimental program carry out, by data collecting system obtain experiment coal sample deformation before and after CO, O2, CH4, CO2, C2H4, temperature and
Data, by a series of experiment, are finally carried out network analysis, mapping comparative analysis by stress, the deformation changing rule of strain,
Obtain coal deformation and heating and oxidation under different stress, different temperatures environment, gas with various pressure, gas concentration and flow condition
Rule, carries out research deep according to the parameter such as the gas componant and concentration of collection, coal body internal temperature and deformation, temperature of exhaust gas
Mining coal deformation and oxidation characteristic under portion's mining environment, so that Prevention Technique and early stage spontaneous combustion for deep mining spontaneous combustion of coal seam
Recognition methods provides theoretical foundation.
Claims (5)
1. dynamic deformation coal body oxidation characteristic test device is adopted in deep, the device by circular cavity (7), hydraulic control system (31),
Temperature control system (24), gas source control system (1) and gas sampling system (17) composition, described circular cavity (7) be by
Coal sample after preparation is put into cavity, pre-buried fibre optic temperature sensor (21) and fibre optic strain sensor (18) inside coal sample, and
It will put and foil gauge (8) is set up after closed heat-shrink tube (19), and then be placed in circular cavity (7), cover cavity lid (12), by
The pressure that hydraulic control system (31) is injected in hydraulic oil (9) and control chamber body to inside cavity, passes through temperature control system
(24) temperature in control chamber body so that the experiment coal sample in cavity meets the environmental effect in deep mining coal seam, source of the gas control
System (1) is to provide required oxygen concentration, gas pressure and uninterrupted for experiment coal sample, and it passes through delicate flow meter
(3) it is controlled, set condition is provided for experiment coal sample, by gas sampling system (17) samples of coal pulled experimentation
Gas componant, concentration and temperature variations are discharged, circular cavity (7) is made up of body cavity and cavity lid (12), and is passed through
Cavity interface (11) is connected, and having on cavity has gim peg (25) on air inlet pipeline (4) and pressure gauge (23), inside cavity base,
And porous backing plate (27) mutually scoops out with, under porous backing plate for circle, size be diameter 50mm, thickness according to experiment needs set
Fixed, intracavitary portion has been arranged as required to a number of flow channel, and provided with air inlet connecting mouth (6), is connected with air inlet pipeline；
Inside cavity top is there is also upper porous backing plate (13), and outlet connects mouth (14) and is connected with outlet pipe joint (15), upper and lower porous
Spacing is 100mm between backing plate.
2. test device according to claim 1, it is characterised in that：Experiment coal sample is placed between porous backing plate, coal sample
Internal preset fibre optic strain sensor (18) and fibre optic temperature sensor (21), coal sample outside and porous backing plate are by closed heat-shrink tube
(19) seal, and be installed on foil gauge (8).
3. test device according to claim 1, it is characterised in that：Described hydraulic control system (31) is by hydraulic oil
(9) injected by in-line (29) in circular cavity (7), for the environment needed for coal sample applies stress, its size is by pressure gauge
(23) read；Hydraulic oil (9) is flowed back by return line (30) and changes circular cavity (7) interior pressure simultaneously.
4. test device according to claim 1, it is characterised in that：Described temperature control system (24) is in circular cavity
Heating collar (10) is put outside body (7), is automatically adjusted according to the temperature value that inside cavity thermocouple (22) feeds back, obtains real
Test required temperature.
5. test device according to claim 1, it is characterised in that：Described gas sampling system (17) is according to hydraulic pressure
Control system (31) is obtained after deformation coal sample, and the gas that experiment coal sample heating and oxidation is discharged is monitored, main monitoring
Index is CO, O2、CH4、CO2、C2H4With the parameter of temperature.
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| CN106018468A (en) * | 2016-05-06 | 2016-10-12 | 辽宁工程技术大学 | Portable coal sample temperature-control heating experimental facility and method |
| CN106226458A (en) * | 2016-09-20 | 2016-12-14 | 河南理工大学 | Stand under load coal body heat of oxidation dynamic trait test device under heterogeneous hot-fluid superposition |
| CN108387675B (en) * | 2018-03-27 | 2024-02-06 | 南京工业大学 | Underground coal fire experimental testing device and method under action of air flow of fire air pressure driven ground cracks |
| CN108279283B (en) * | 2018-05-03 | 2023-08-11 | 华北理工大学 | Device for measuring adsorption and desorption characteristics of multi-component gas in coal spontaneous combustion process |
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| BE1012672A3 (en) * | 1999-05-07 | 2001-02-06 | Clers Bertrand Des | Anticipation process and / or prevention of explosion and / or a mixture of ignition fuel / oxidizing agent. |
| CN1595129A (en) * | 2004-07-16 | 2005-03-16 | 中国矿业大学 | Thermal insulation testing process and apparatus for simulating coal spontaneous combustion procedure |
| CN102279420B (en) * | 2011-04-15 | 2013-03-13 | 河南理工大学 | Development simulation test system of coal metamorphic evolution fissure system |
| CN102830213B (en) * | 2012-08-10 | 2015-07-29 | 河南理工大学 | Stand under load coal containing methane gas absorption-desorption-seepage flow experiment system under temperature match curing conditions |
| CN103278428B (en) * | 2013-05-10 | 2015-05-20 | 东北大学 | Device and method for gas bearing shale-seepage-temperature coupling and displacement experiment |
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