CN102252957B - Experimental measurement device and method of solid-liquid conversion parameters of decompressed coal - Google Patents
Experimental measurement device and method of solid-liquid conversion parameters of decompressed coal Download PDFInfo
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- CN102252957B CN102252957B CN 201110097059 CN201110097059A CN102252957B CN 102252957 B CN102252957 B CN 102252957B CN 201110097059 CN201110097059 CN 201110097059 CN 201110097059 A CN201110097059 A CN 201110097059A CN 102252957 B CN102252957 B CN 102252957B
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Abstract
The invention provides an experimental measurement device and method of solid-liquid conversion parameters of decompressed coal. The device provided by the invention comprises a coal sample chamber, a pressurizing and decompressing device, gas pressure loading equipment, a data acquisition system and a fixed support system. The device provided by the invention can simulate the high-pressure gas packet forming course of a coal layer because of a deep decompression mechanism and measures the two-phase fluid pressure and temperature of the course and the propagation speed of a solid-liquid conversion front, thereby proving a theoretical model and basic data for the basic theory and numerical simulation of coal and gas outburst. When the device provided by the invention is used, the coal powder practical size parameters of a pressed coal sample, the gas loading pressure, the pressing length of the coal sample and the pressing force of the coal sample can be adjusted to obtain different test results. The device has the advantages of simplicity in structure, low cost and simplicity in operation.
Description
Technical field
The present invention relates to colliery underground mining coal and gas outbursts Prediction field, particularly relate to the mensuration of coal and gas outburst simulation test parameter.
Background technology
The structure coal be a kind of in pressure property, press the plasticity shear flow variant that forms under the property turned round, the effect of shear structure stress, be not subjected to adopting or the condition of external disturbance such as earthquake under, sealed up for safekeeping by country rock and tectonic stress as a kind of energetic material.When release, namely be converted into the gas-solid phase body, see through the coal seam and overflow or ooze out to workplace, break through the coal body that the place ahead stops when pressure is higher, it is outstanding to form coal and gas, brings great harm to mine production and miner's life.With regard to release mechanism, can be divided into two kinds substantially, a kind of is the side direction release that excavation causes, another kind is the deep release that exploitation disturbance such as mining-induced stress, blasting vibration cause.
In the last few years, the coal that release causes at side direction and gas were outstanding, had carried out some physical simulation experiments and numerical experimentation successively.Physical simulation experiment is divided into shock tube test and the three dimensional taest platform simulation test of one dimension.The former suppresses coal containing methane gas in shock tube, and uses foil sealing, opens film then rapidly the structure coal is communicated with ambient atmosphere, thereby form the gas release, gas is unloading the pressure surface parsing and to the air loss, is unloading pressure surface simultaneously and propagate along shock tube to the coal seam, deep, and it is outstanding to form lasting coal and gas.The simulation of three dimensional taest platform is that compacting contains gas structure coal in a trough-shaped container, with seal of vessel and pour high pressure gas, exert pressure to the structure coal on container top, open the reservation shedding motion that is arranged on container one side then, under upper pressure drove, coal and gas were outstanding from reserving opening part like this.We can say that two kinds of test units have all reflected the physical process that coal and gas are outstanding to a certain extent, play good effect to the prediction level that improves coal and gas.Based on above physical model, Gu the outstanding numerical simulation of coal and gas is actually a stream-coupling model now, be the pressure effect of gas of being coupled in the evolutionary process of coal body damage, fracture---from the angle of whole audience seepage flow mean field, the interaction of research coal and gas: coal body is from equally distributed micro-damage, through the damage localization, last tandem is grown up and is formed macroscopical major rupture, causes gas seepage flow to the concentration of local of zone of fracture, form the higher-pressure region, it is outstanding to promote coal body.Above-mentioned model belongs to the side direction release, can explain that near the small-scale coal body the getting working face destroys, gas overflows, the severe degree of its dynamic phenomenon a little less than, can't be called outstanding.
So-called deep release refers to that the non-direct excavation of release causes, but since the stress disturbance that the roof fracture causes, concussion of blasting in the release mechanism that causes away from the excavation free face.This release mechanism often occurs in apart from the coal seam depth of getting working face certain distance and stone door punching coal engineering.The unexpected release in coal seam causes the release cavity to produce, the structure coal will be transformed to two-phase fluid (coal particle+methane gas) by high-voltage solid-state, the cavity inner fluid gathers, pressure increases, the acting of externally expanding, and promotes coal body and dishes out to workplace, gives prominence to gas thereby form coal.This outstanding forming process is more hidden, and intensity of outburst is often very big, thus its first kind of release mechanism of hazard ratio (release of workplace side direction) of the causing coal and the gas that cause to overflow (inclining to) much bigger.
Summary of the invention
The present invention is that the coal and the gas that cause at the deep release are specially given prominence to proposition, be specifically designed to measure and construct coal in the deep release cavity by the various state parameters of solid to the two-phase fluid conversion process, as hydrodynamic pressure, temperature, conversion front velocity of propagation etc., thereby forming process, intensity of outburst evaluation and the numerical simulation of giving prominence to for the coal that causes of understanding deep release and gas provide basic data and physical model.
Release of the present invention structure coal is solid-circulationization parameter measuring device, and comprise coal sampling mill, add pressure relief device, air pressure-loading equipment, data acquisition system (DAS), fixed support system.Described coal sampling mill is made by steel cylinder, and the steel cylinder two ends are respectively arranged with the underseal lid and are connected with steel cylinder by bolt with the closedtop lid.The underseal lid is provided with central duct and is connected with described air pressure-loading equipment.The closedtop lid is provided with three planet ducts, is 120 ° around the center and is spaced, and voltage supply power is transmitted bar and passed.The described pressure relief device that adds is made up of pressure capping, pressure transmission bar, pressure cushion cap, pressure plate, piston and pressure cylinder.Described data acquisition system (DAS) is made up of the sensor, cable, data acquisition unit and the computing machine that are embedded on steel cylinder wall and the pressure capping.Described fixed support system is made up of reaction frame and bracing frame.
Further, pressure transmits bar one end fixedlys connected with the pressure capping, and the other end is fixedlyed connected with the pressure cushion cap.The acting force of piston driven pressure cushion cap orders about the pressure capping by pressure transmission bar and moves in steel cylinder.
Further, at least two bolt ducts are set on the pressure capping, are used for inlaying temperature sensor and pressure transducer.Pressure capping side is used for installing O-ring seal along groove is set.
Further, the sensor setting on the described steel cylinder wall is at least two row, and along steel cylinder axis direction linear array, a row is temperature sensor, and another row is pressure transducer.
Further, the end, is sealed on the coal sampling mill side and kerve is set for the foam metal net is installed, and underseal lid center arranges draft tube, links to each other with gas-loaded equipment.
Further, the closedtop lid also is provided with central duct, is used for the cable output of capping upper sensor.
Further, the support of described fixed support system is at least three, and steel cylinder is installed on two bracing frames, and pressure cylinder is placed on another support.
Further, the reaction frame column near the underseal lid is provided with the draft tube passage.
Beneficial effect of the present invention: release structure coal provided by the invention is consolidated-circulationization parameter measuring device, can simulate the coal seam because the bag of foulness forming process that causes of deep release mechanism, and the velocity of propagation of two-phase fluid pressure, temperature and solid-circulationization front of this process is measured.Basic theory and the numerical simulation outstanding for coal and gas provide theoretical model and basic data.During use, the compacting length of the coal particle size parameter of adjustable seamless coal sample processed, gas-loaded pressure, coal sample, the press power of coal sample obtain different test findings.The present invention is simple in structure, and cost is low, and is simple to operate.
Description of drawings
Fig. 1 is test unit structural representation of the present invention.
Fig. 2 is test unit support fixed structure synoptic diagram of the present invention.
Embodiment
In the present embodiment, pressure transmits bar (8) one ends fixedlys connected with pressure capping (3), and the other end is fixedlyed connected with pressure cushion cap (9).The acting force of piston (11) driving pressure cushion cap (9) transmits bar (8) by pressure and orders about pressure capping (3) and move in steel cylinder (1).
In the present embodiment, pressure capping (3) is gone up at least two bolt ducts is set, and is used for inlaying temperature sensor and pressure transducer.Pressure capping lateral margin arranges groove, is used for installing O-ring seal (4).
In the present embodiment, the sensor on the described steel cylinder wall (13,14) setting is at least two row, and along steel cylinder axis direction linear array, a row is temperature sensor, and another row is pressure transducer.
In the present embodiment, the end, is sealed on the coal sampling mill side and kerve is set for foam metal net (5) is installed, and underseal lid (2) center arranges draft tube (6), links to each other with gas-loaded equipment.
In the present embodiment, the closedtop lid also is provided with central duct (16), is used for the cable output of capping (3) upper sensor.
In the present embodiment, the support of described fixed support system is at least three, and steel cylinder (1) is installed on two bracing frames, and pressure cylinder (19) is placed on another support.
In the present embodiment, the column of the reaction frame (21) of close underseal lid (2) is provided with draft tube passage (22).
Parametric measurement method of the present invention is as follows:
(1) coal sample compacting.Sampling is through pulverizing, screening from structure coal seam, scene, and the coal dust that will screen different-grain diameter (order) then carries out proportioning, and mixes an amount of moisture, and the coal dust segmentation is suppressed in steel cylinder 1, and the every section coal length in compacting back is suitable with the steel cylinder diameter; Every section coal sample (18) compacting should keep 5 minutes at least, and the press face that coal is intersegmental draws brokenly, and the coal section is evenly joined.Can select different pressures compacting coal sample during experiment for use, also can suppress different coal sample length.Pressure provides by adding pressure relief device.In the coal sample pressing process, pressure capping (3) is sensor installation not, treats that the last compacting of coal sample finishes sensor installation.Suppress actual mass and the length of coal sample according to weighing before each experiment, thereby calculate density and the porosity of coal sample.
(2) inflation seepage flow.After the last compacting of coal sample is finished, measure the permanent seepage flow of original coal sample earlier:
After coal sample is finished, withdraw pressure capping (3), draft tube (6) is connected gas-loaded equipment, and gas (CH4) filters through foam metal net (5) and is formed on the pressure front that the steel cylinder xsect is promoted comprehensively, by each measuring point pressure of computer sampling, judge whether to reach permanent seepage flow.Can calculate the permeability of coal sample this moment according to steel cylinder upstream pressure, downstream pressure, flow and coal sample length etc.
Next, carry out the high pressure gas inflation, pressure condition is deposited in the tax that forms the structure coal:
The coal sample that reaches permanent seepage flow is sealed with pressure capping (3), and steel cylinder (1) end is sealed with closedtop lid (17).Piston (11) is forced into the terrestrial stress value, and it is constant to keep-up pressure, at pressure capping (3) mounting temperature sensor and pressure transducer.Continue to inflate in the coal sample in the steel cylinder by draft tube (6), until the gas pressure that forms the underground structure coal, close draft tube (6) valve.
(3) Gu release--circulationization
When treating that gas pressure in the steel cylinder reaches underground gas pressure, pressure cylinder (19) release, remove billet (10) rapidly, form rapidly near the pressure capping (3) and unload nip, the structure coal begins to be transformed to two-phase fluid by solid-state, the hydrodynamic pressure and the temperature that transform to form are recorded by the sensor on the pressure capping (3), Gu-velocity of propagation of circulationization front records by the pressure transducer (13) on steel cylinder (1) wall and temperature sensor (14).
(4) data transmission and processing
Pressure transducer and temperature sensor data enter multi-channel data acquisition device (A/D) through cable (15), the output digital signal, and preservation is got off.Computing machine is installed signal processing software, and data are handled.By the mistiming to the first arrival pressure of the pressure transducer of steel cylinder (1) diverse location record, and the spacing distance of sensor, calculate the velocity of propagation of propagating front.Change in fluid pressure and temperature variation are directly read by temperature sensor and pressure transducer on the pressure capping (3).
Claims (8)
1. a release structure coal is consolidated-circulationization parameter measuring device, comprise coal sampling mill, add pressure relief device, air pressure-loading equipment, data acquisition system (DAS), the fixed support system, it is characterized in that: described coal sampling mill is made by steel cylinder (1), the steel cylinder two ends are respectively arranged with underseal lid (2) and closedtop lid (17), above-mentioned underseal lid is connected with steel cylinder (1) by bolt (7) with the closedtop lid, underseal lid (2) is provided with draft tube (6) and is connected with described air pressure-loading equipment, closedtop lid (17) is provided with three ducts, be 120 ° around the center and be spaced, voltage supply power is transmitted bar (8) and is passed; The described pressure relief device that adds transmits bar (8), pressure cushion cap (9), pressure plate (10), piston (11) and pressure cylinder (19) by pressure capping (3), pressure and forms, and the acting force of piston (11) driving pressure cushion cap (9) transmits bar (8) by pressure and orders about pressure capping (3) and move in steel cylinder (1); Described data acquisition system (DAS) by be embedded on steel cylinder (1) wall and pressure capping (3) on sensor (13,14), cable (15), data acquisition unit and computing machine form; Described fixed support system is made up of reaction frame (21) and bracing frame (20).
2. structure coal according to claim 1 is consolidated-circulationization parameter measuring device, it is characterized in that, pressure transmits bar (8) one ends fixedlys connected with pressure capping (3), and the other end is fixedlyed connected with pressure cushion cap (9).
3. structure coal according to claim 1 is consolidated-circulationization parameter measuring device, it is characterized in that, pressure capping (3) is gone up at least two bolt ducts is set, be used for inlaying temperature sensor and pressure transducer, and pressure capping (3) side is used for installing O-ring seal (4) along groove is set.
4. consolidate-circulationization parameter measuring device according to each described structure coal of claim 1-3, it is characterized in that the sensor on the described steel cylinder wall (13,14) setting is at least two row, along steel cylinder axis direction linear array, one row is temperature sensor, and another row is pressure transducer.
5. consolidate-circulationization parameter measuring device according to each described structure coal of claim 1-3, it is characterized in that, the end, is sealed on the coal sampling mill side and kerve is set for foam metal net (5) is installed, and underseal lid center arranges draft tube (6), links to each other with air pressure-loading equipment.
6. consolidate-circulationization parameter measuring device according to each described structure coal of claim 1-3, it is characterized in that, closedtop lid (17) also is provided with central duct (16), is used for the cable output of pressure capping (3) upper sensor.
7. consolidate-circulationization parameter measuring device according to each described structure coal of claim 1-3, it is characterized in that, the bracing frame of described fixed support system is at least three, and steel cylinder (1) is installed on two bracing frames, and pressure cylinder (19) is placed on another bracing frame.
8. consolidate-circulationization parameter measuring device according to each described structure coal of claim 1-3, it is characterized in that, reaction frame (21) column that covers near underseal is provided with draft tube passage (22).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102706528B (en) * | 2012-05-25 | 2015-04-08 | 中国矿业大学(北京) | Gas flow characteristic testing device of fragmented coal rock mass |
| CN104698138B (en) * | 2015-03-23 | 2017-08-11 | 贵州省矿山安全科学研究院 | Microseismic response coal and gas outburst self-triggering simulation experiment device |
| CN105301202B (en) * | 2015-11-24 | 2018-01-02 | 山东科技大学 | For determining the test system and method for testing of up-protective layer exploitation relief range |
| CN105651961B (en) * | 2016-01-14 | 2017-06-13 | 太原理工大学 | A kind of Forecasting Methodology of Coal Seam Outburst Hazard |
| CN106018732B (en) * | 2016-06-27 | 2017-12-15 | 河南理工大学 | Gas dynamical disaster simulator stand quick release device and test method |
| CN107421815A (en) * | 2017-08-03 | 2017-12-01 | 太原科技大学 | The uniaxial compression experimental provision that coal containing methane gas Rock Damage destroys |
| CN108088718B (en) * | 2017-12-22 | 2020-06-19 | 徐州恒安煤矿技术有限公司 | Underground coal seam soft layering simulation replication method and small-sized soft layering pressing device |
| CN109063257B (en) * | 2018-07-02 | 2019-04-26 | 山东科技大学 | A kind of coal and rock subregion water filling seepage flow-damage-stress coupling method for numerical simulation |
| CN112284614A (en) * | 2020-11-08 | 2021-01-29 | 中国航空工业集团公司北京长城计量测试技术研究所 | Positive step force generator |
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| CN101409024A (en) * | 2008-07-25 | 2009-04-15 | 安徽理工大学 | Analog system for coal seam mash gas dynamic action |
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Patent Citations (4)
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| CN101226183A (en) * | 2008-01-22 | 2008-07-23 | 重庆大学 | Projecting simulator stand for coal and firedamp |
| CN101409024A (en) * | 2008-07-25 | 2009-04-15 | 安徽理工大学 | Analog system for coal seam mash gas dynamic action |
| CN101487835A (en) * | 2009-02-06 | 2009-07-22 | 煤炭科学研究总院重庆研究院 | Test apparatus for coal and gas burst |
| CN101806792A (en) * | 2010-04-15 | 2010-08-18 | 中国科学院力学研究所 | Coal and gas outburst simulation test device and protection device thereof |
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