CN104316668A - Device for testing oxidation properties of coal body under deep mining deformation condition - Google Patents
Device for testing oxidation properties of coal body under deep mining deformation condition Download PDFInfo
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- CN104316668A CN104316668A CN201410625651.XA CN201410625651A CN104316668A CN 104316668 A CN104316668 A CN 104316668A CN 201410625651 A CN201410625651 A CN 201410625651A CN 104316668 A CN104316668 A CN 104316668A
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Abstract
The invention relates to a device for testing the oxidation properties of a coal body under the deep mining deformation condition, in particular to a device for testing the self-combustion oxidation properties of coal in multiple complicated environments with high stress, high temperature, high gas flow pressure, high gas concentration and flow and high-intensity mining deformation. The device comprises a round cavity body, a hydraulic control system, a gas source control system and a gas acquisition system, and is characterized in that the outside of the round cavity body is connected with the hydraulic control system, the gas source control system and the gas acquisition system. During experiment, a prepared coal sample is put into the round cavity body, the pressure and the temperature in the cavity body are adjusted for enabling the experimental coal sample in the cavity body to satisfy the occurrence environment of an actual coal bed, the gas concentration, flow and pressure of the gas source system are adjusted, a gas inlet valve is opened for providing the set gas source for the experimental coal sample, a gas outlet valve is opened, and the released gas and the temperature situation as well as the internal temperature change and stress-strain parameters of the coal sample are acquired for analyzing the oxidation properties of the coal body under the mining deformation condition.
Description
Technical field
The present invention relates to deep and adopt dynamic deformation coal body oxidation characteristic proving installation, this device is prevention and control of mine disaster field, is specifically related to heavily stressed, high-temperature, high gas flow pressure and high strength and adopts spontaneous combustion of coal oxidation characteristic test under the multiple complex environment of dynamic deformation.
Background technology
Coal industry is the basic industry of China, and coal accounts for about 70% 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 degree of depth total reserves more than km accounts for often, and according to Investigation on Data, the reserves of the degree of depth account for more than 70% of total amount.Along with the minimizing gradually of superficial part coal resources is even exhausted, become trend to deep mining.According to related data, it is 800 ~ 1500m that the degree of depth of China's coal-mine deep resource exploitation is delimited.The mean depth that China's deep mining development trend is exploited from China's coal-mine in 1980 is 288m, nineteen ninety-five reaches 428m, 20 coal mining depth in the end of the century near 500m, within 2005, mining depth on average reaches 700m, and coal mining depth increases with the speed of annual 10 ~ 20m, in current coal mining, a lot of mine of China has entered the deep mining of 800m to the 1500m degree of depth.The geologic media that deep mining is residing complicated, coal and rock is all in the state of high-ground stress, High-geotemperature, high pore pressure and high strength disturbance, causes easy deep Conflagration Caused by Coal Self-ignition and is on the rise.Moreover, it is all the time all very serious to there is spontaneous combustion in China's superficial part coal seam, according to statistics, the mine in China's State owned coal mine with the dangerous coal seam of easy spontaneous fire accounts for 56%, spontaneous combustion of coal is the principal element causing mine fire, the mine fire of more than 90% is caused by spontaneous combustion of coal, and spontaneous combustion of coal becomes the major casualty of mine.But along with mining depth increase, ground temperature, press and all linearly increase, the degree of fragmentation of coal and rock and plasticity increase, mechanical property of coal seam changes, and coal body mesoporosity will be grown, develop, be out of shape and through, and the seepage flow diffusion of gas strengthens, the oxygen uptake characteristic of coal, heat gather release rule and will marked change be there is in accumulation of heat environment, cause deep mining operation Coal Spontaneous Combustion Characteristics to be obviously different from shallow mining coal seam, and spontaneous combustion process, oxidation characteristic and Prevention Technique will become more complicated.
At present, for the challenge that deep mining operation spontaneous combustion of coal presents, there is not relevant experimental provision can meet the test of deep mining complex condition Coal Spontaneous Combustion Characteristics, the actual conditions of deep coal mining cannot be adapted to.
Summary of the invention
The object of the invention is to realize Coal Spontaneous Combustion Characteristics method of testing in deep mining operation, there is provided a kind of means reliable, rational in infrastructure, method is easy, measure accurately, data visualization, the proving installation adopting dynamic deformation coal body oxidation characteristic met in deep fractures occurrence condition and recovery process of good test effect.
Technical scheme of the present invention:
Dynamic deformation coal body oxidation characteristic proving installation is adopted in deep of the present invention, and this device is made up of circular cavity, hydraulic control system, temperature control system, gas source control system and gas acquisition system.It is characterized in that: circular cavity be by preparation after coal sample put into cavity, the inner pre-buried fibre optic temperature sensor of coal sample and fibre optic strain sensor, to heat-shrink tube in coal sample and porous pad sleeve-board, and set up foil gauge, then be placed in circular cavity, cover cavity lid, injection liquid force feed in cavity is started according to experiment setting strategy parameter, regulator solution pressure control system controls the pressure in cavity, the temperature in cavity is controlled by temperature control system, the experiment coal sample in cavity is made to meet the Environmental effect in deep mining coal seam, the air mass flow simultaneously regulating air supply system to control and gas pressure parameter, by the CO discharged in data acquisition system coal sample experimentation, O2, CH4, CO2, the parameters such as C2H4 and temperature variations, and experiment coal sample internal temperature changes 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 for having airtight and compressive property, and cavity is made up of body cavity and cavity lid, and inside cavity base is lower porous backing plate, porous backing plate is provided with the gas passage of some, and is connected with draft tube; Also there is upper porous backing plate in inside cavity top, is connected with outlet pipe road.Lower porous backing plate is fixed by gim peg, and test coal sample is placed between upper and lower porous backing plate, the inner preset fibre optic strain sensor of coal sample and fibre optic temperature sensor, coal sample outside and the sealing of porous pad sleeve-board heat-shrink tube.
Described hydraulic control system injects in circular cavity by hydraulic oil by in-line, and be the stress that coal sample applying ocurrence of coal seam environment needs, its size is obtained by tensimeter; During release simultaneously, hydraulic oil is refluxed by return line and reduces the pressure in circular cavity.
Described temperature control system is outside circular cavity, overlap heating collar, according to the temperature value of inside cavity feedback, is automatically adjusted by temperature control system, obtains the temperature needed for experiment.
Described gas source control system is that it is controlled by the experiment condition of delicate flow meter according to setting for experiment coal sample provides required oxygen concentration, gaseous tension and uninterrupted, for experiment coal sample provides set condition.
Described gas collecting system is monitored discharging gas after adopting dynamic deformation coal sample heating and oxidation, main monitoring index is parameter and the temperature conditionss such as CO, O2, CH4, CO2, C2H4, it gathers automatically, for air release characteristic and rule under the experiment condition of comparative analysis different set, and and between experiment coal sample deformation characteristic relation make more deep study and analysis.
Dynamic deformation coal body oxidation characteristic method of testing is adopted in deep of the present invention:
A, the raw coal sample prepared is carried out inner preset fibre optic strain sensor and temperature sensor, and be placed between upper and lower two porous backing plates, then heat-shrink tube is carried out sealing coal sample tight, experimentally need to stick foil gauge in sample outside, then be placed in circular cavity, the porous backing plate of firm banking, sets up circular cavity capping, and seals intact.
B, by hydraulic control system to injection liquid force feed in circular cavity, tensimeter monitoring cavity in pressure size, when reaching the stress value set by experimental program, close oil inlet valve, make coal sample be placed in corresponding ambient stress.
C, the peripheral heating collar of adjustment circular cavity, and obtain the temperature level set by inside cavity by temperature control system, make coal sample be placed in corresponding temperature environment.
D, according to set experimental program, regulate the flow needed for delicate flow meter and pressure size, start gas collecting system, temperature acquisition system and ess-strain acquisition system simultaneously.
E, after all control system are all debugged, start acquisition system, open air intake valve and to give vent to anger valve, and increase according to the requirement of experiment setting in experimentation or reduce cavity internal stress, make the distortion that coal body occurs in various degree, and oxidation and spontaneous combustion.
F, experimentally to need, carry out coal deformation and oxidation test experiments under different stress, different temperatures environment, gas with various pressure condition, analyze according to the gas componant gathered and concentration, coal body internal temperature and the parameter such as distortion, temperature of exhaust gas, coal deformation and oxidation characteristic under research deep mining environment.
The invention has the beneficial effects as follows:
From the above mentioned, apparatus of the present invention realize the test that coal body oxidation characteristic in coal seam deformation process is adopted in deep, by setting the pressure and temperature in circular cavity, juxtaposition coal sample is in wherein, by the delicate flow instrument control gas flow in draft tube and pressure, the pressure changing hydraulic oil in cavity obtains stress in coal bed strain and is out of shape disrumpent feelings degree, the crack that coal body occurs in different distortion process develops and different pressures, variable concentrations oxygen interacts, the index gas composition discharged and concentration are by each variant, by analyzing monitored parameter, coal body Oxidation Law in mining active process under acquisition deep fractures Environmental effect, disclose deep mining coal internal modification, crack evolution Feature and to Oxygen Adsorption percolation law, thus provide theoretical direction for the control of deep mining spontaneous combustion of coal seam.
Thus apparatus of the present invention can meet the test request that deep mining adopts coal body oxidation characteristic in coal seam deformation process completely, propose proving installation innovatively, fill up the demand to experimental provision in the Coal Self-ignition Process of research deep.This apparatus structure is reasonable, processing ease, and method of testing is easy, technically reliable, and measuring accuracy is high, and method is easily grasped, automatic data collection and visual, and cost is low, has applicability and application value widely.
Accompanying drawing explanation
Fig. 1 is the general structure schematic diagram of apparatus of the present invention.Wherein there is gas source control system 1, air inlet pipeline by-pass valve control 2, 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, heating collar 10, cavity interface 11, cavity lid 12, upper porous backing plate 13, give vent to anger and connect mouth 14, outlet pipe joint 15, outlet pipe by-pass valve control 16, gas collecting system 17, optical fiber stress sensor 18, airtight heat-shrink tube 19, experiment coal sample 20, fibre optic temperature sensor 21, thermopair 22, tensimeter 23, temperature control system 24, oil-feed by-pass valve control 25, oil return by-pass valve control 26, lower porous backing plate 27, gim peg 28, in-line 29, return line 30, hydraulic control system 31, data collecting card 32.
Embodiment
Below in conjunction with accompanying drawing, the embodiment that dynamic deformation coal body oxidation characteristic proving installation is adopted in deep of the present invention is further described:
Dynamic deformation coal body oxidation characteristic proving installation is adopted in deep of the present invention, experimentally device obtains standard round column type raw coal sample (50mm × 100 mm), raw coal sample is carried out to the treatment and processing of preset fibre optic strain sensor and temperature sensor, then coal sample is placed on the porous backing plate (50mm) of base, heat-shrink tube is all overlapped in coal sample and porous backing plate, laying upper porous backing plate, hair dryer is utilized to carry out shrink process to heat-shrink tube, heat-shrink tube is made tightly coal sample to be carried out sealing tight, foil gauge is set up in experiment coal sample outside, and by the gim peg position of circular cavity inside, coal sample is placed in cavity, cover the capping of circular cavity, and check the impermeability of whole inside cavity, ensure that sealing is intact.The hydraulic pump of primer fluid pressure control system, opens oil inlet valve, starts injection liquid force feed in cavity, when the pressure in tensimeter monitoring cavity reaches the force value needed for experiment, close oil inlet valve, experiment coal sample is in the force value environment of setting, and coal body will be out of shape by compression.Then start the heating collar of circular cavity periphery, regulate the temperature value set by temperature control system, and this temperature constant always, make experiment coal sample be in the temperature value environment of setting, coal body is because being heated the change of generation micromechanism.Start gas source control system subsequently, regulate the flow needed for delicate flow meter and pressure size, and debug all acquisition systems, experiment can be carried out by two kinds of modes, one: the pressure and temperature in constant cavity, open air intake valve and valve of giving vent to anger, carry out the coal body oxidation experiment under this condition; Its two, pressure in removal cavity obtains coal mass relief distortion, crack produces, through and disrumpent feelings, or experimentally needs to change the temperature in cavity, is opening air intake valve and the drain tap of air supply system.Experimental period can be carried out according to the experimental program of setting, the CO before and after the distortion of experiment coal sample is obtained by data acquisition system (DAS), O2, CH4, CO2, C2H4, temperature and stress, the distortion Changing Pattern of strain, by a series of experiment, finally systematic analysis is carried out to data, mapping comparative analysis, obtain different stress, different temperatures environment, gas with various pressure, coal deformation and heating and oxidation rule under gas concentration and flow condition, according to the gas componant gathered and concentration, coal body internal temperature and distortion, under the parameters such as temperature of exhaust gas carry out research deep mining environment, mining coal is out of shape and oxidation characteristic, thus provide theoretical foundation for the Prevention Technique of deep mining spontaneous combustion of coal seam and early stage spontaneous combustion recognition methods.
Claims (8)
1. dynamic deformation coal body oxidation characteristic proving installation is adopted in deep, and this device is made up of circular cavity (7), hydraulic control system (31), temperature control system (24), gas source control system (1) and gas acquisition system (17).
2. proving installation according to claim 1, it is characterized in that: circular cavity (7) be by preparation after coal sample put into cavity, the inner pre-buried fibre optic temperature sensor of coal sample and fibre optic strain sensor, and set up foil gauge (8) after airtight heat-shrink tube (19) will be put, then be placed in circular cavity (7), cover cavity lid (12), according to experiment setting scheme by hydraulic control system (31) to inside cavity injection liquid force feed (9) and the pressure controlled in cavity, the temperature in cavity is controlled by temperature control system (24), the experiment coal sample in cavity is made to meet the Environmental effect in deep mining coal seam, gas source control system (1) debugging gas flow and pressure parameter, by discharge in gas collecting system (17) samples of coal pulled experimentation gas componant and, concentration and temperature variations.
3. proving installation according to claim 1, it is characterized in that: described circular cavity (7) is made up of body cavity and cavity lid (12), and connected by cavity interface (11), cavity there are air inlet pipeline (4) and tensimeter (23), inside cavity base there is gim peg (25), and scoop out mutually with lower porous backing plate (27), lower porous backing plate is circular, be of a size of diameter 50 mm, thickness experimentally needs setting, gas inside is provided with the flow channel of some as required, and be provided with air inlet connecting mouth (6), be connected with air inlet pipeline, also there is upper porous backing plate (13) in inside cavity top, gives vent to anger to connect mouth (14) and be connected with outlet pipe joint (15), and between upper and lower porous backing plate, spacing is 100mm.
4. proving installation according to claim 1, it is characterized in that: experiment coal sample is placed between porous backing plate, the inner preset fibre optic strain sensor (18) of coal sample and fibre optic temperature sensor (21), coal sample outside and porous backing plate by airtight heat-shrink tube (19) sealing, and are installed on foil gauge (8).
5. proving installation according to claim 1, it is characterized in that: described hydraulic control system (31) injects in circular cavity (7) by hydraulic oil (9) by in-line (29), for coal sample applies stressed required environment, its size is read by tensimeter (23); Hydraulic oil (9) changes circular cavity (7) interior pressure by return line (30) backflow simultaneously.
6. proving installation according to claim 1, it is characterized in that: described temperature control system (24) puts heating collar (10) in circular cavity (7) outside, automatically adjust according to the temperature value that inside cavity thermopair (22) feeds back, obtain the temperature needed for experiment.
7. proving installation according to claim 1, it is characterized in that: described gas source control system (1) is for experiment coal sample provides required oxygen concentration, gaseous tension and uninterrupted, it is controlled by delicate flow meter (3), for experiment coal sample provides set condition.
8. proving installation according to claim 1, it is characterized in that: described gas collecting system (17) is after obtaining distortion coal sample according to hydraulic control system (31), monitor the gas that experiment coal sample heating and oxidation discharges, main monitoring index is the parameter such as CO, O2, CH4, CO2, C2H4 and 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 |
| CN108279283A (en) * | 2018-05-03 | 2018-07-13 | 华北理工大学 | To the measurement device of multicomponent gas adsorption-desorption characteristics in Coal Self-ignition Process |
| CN108387675A (en) * | 2018-03-27 | 2018-08-10 | 南京工业大学 | Fire heating air pressure drives underground coal fire experiment test device and method under ground fissure airflow function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108387675A (en) * | 2018-03-27 | 2018-08-10 | 南京工业大学 | Fire heating air pressure drives underground coal fire experiment test device and method under ground fissure airflow function |
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| 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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