CN101393100A - Ventilation property test method and device for hypergolic coal waste pile isolating layer - Google Patents
Ventilation property test method and device for hypergolic coal waste pile isolating layer Download PDFInfo
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- CN101393100A CN101393100A CNA2008102258440A CN200810225844A CN101393100A CN 101393100 A CN101393100 A CN 101393100A CN A2008102258440 A CNA2008102258440 A CN A2008102258440A CN 200810225844 A CN200810225844 A CN 200810225844A CN 101393100 A CN101393100 A CN 101393100A
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- 239000003245 coal Substances 0.000 title claims description 26
- 238000010998 test method Methods 0.000 title abstract description 3
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- 239000002699 waste material Substances 0.000 title 1
- 238000012360 testing method Methods 0.000 claims abstract description 44
- 238000002347 injection Methods 0.000 claims abstract description 32
- 239000007924 injection Substances 0.000 claims abstract description 32
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 20
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- 238000000926 separation method Methods 0.000 claims description 26
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- 239000002689 soil Substances 0.000 claims description 9
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- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000002910 solid waste Substances 0.000 abstract description 2
- 239000010879 coal refuse Substances 0.000 abstract 4
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Abstract
The invention relates to a method and a device for testing the gas permeability of an isolating layer of a self inflammable coal refuse heap, which belongs to the technical field of treatment and utilization of environmental, ecological and solid waste. The method comprises the following steps: the device is hermetically connected by a gas injection chamber, a test chamber and an exhaust chamber in turn along the direction of the gas paths, so as to form an enclosed gas chamber; the gas paths of the upstream section and the downstream section are isolated by an isolating layer sample in the test chamber; constant-pressure air flow is injected on the upstream section; a downstream instrument is communicated with the atmosphere; and the gas permeability of the isolating layer sample is determined after the positive pressure difference on both sides of the sample is stabilized. The test method is simple and convenient; the dimension of the sample is large; the test process well simulates the objective reality; and the method can detect the gas permeability of the isolating layer for treating the self inflammable coal refuse heap, and guarantee that the configuration of the isolating layer has the function of air barrier, thereby preventing spontaneous combustion of the coal refuse heap, reducing the hazard of the coal refuse heap on the environment, and improving the ecological environment of mining areas.
Description
Technical field
The invention belongs to environment, ecology and disposition of solid waste and utilize technical field, particularly the technical method of self-ignition coal gangue hill improvement.
Background technology
Gangue is the inevitable outcome in coal mining and the process, and this discarded object contains a large amount of S, C, heavy metal and other objectionable impurities, is the topmost pollution source in mine.Generally speaking, gangue accounts for 10～30% of raw coal output, and according to incompletely statistics, China's gangue cumulative amount has reached more than 3,500,000,000 tons at present, and utilization factor is still less than 30%.Contain troilite, sulphur, coal dust etc. in the gangue, spontaneous combustion very easily takes place in air storage, thereby discharges a large amount of pollutants such as dust, toxic and harmful such as SO
2, CO, H
2S etc., leaching acidulous water meeting severe contamination soil, the face of land and the body of groundwater of generation, serious harm local resident health and ecologic environment.Simultaneously, self-ignition coal gangue hill is because the gradient is big, the effect of rainfall etc., cause easily cave in, geologic hazards such as landslide, rubble flow even blast, cause serious economy loss and casualties.Therefore, the spontaneous combustion of coal gangue hill phenomenon of storing up has in the open caused serious social concern and environmental problem, and the improvement of self-ignition coal gangue hill is the task of top priority.
In the practice, China administers self-ignition coal gangue hill, and the normal method that adopts is that fluid injection fire-fighting combines with the loess covering, but regulation effect is undesirable, and resume combustion is serious.Some country fact proved as far back as the eighties in last century, covering loess can not effectively stop the generation of inner troilite oxidation of coal gangue hill and spontaneous combustion separately, cost is high and be unfavorable for revegetation, and the low loess good permeability of vegetation coverage, be beneficial to the infiltration of air injection and water, thereby promoting that heat is accumulated in the troilite oxidation in the gangue causes the gangue spontaneous combustion.Based on this, there is the research of mining area and R﹠D institution to administer self-ignition coal gangue hill and on the classic method basis, adds separation layer, separation layer is made of different soil property inert materials and imposes engineering measure as rolling, make its permeability satisfy certain air iris action to prevent the gangue spontaneous combustion, cover loess and carry out greening vegetation, thereby reach the purpose of permanently effective improvement self-ignition coal gangue hill.
The difficult problem that the application separation layer need crack during self-ignition coal gangue hill was administered is:
1) how the configuration of separation layer satisfies the obstruct air, prevents the gangue spontaneous combustion;
2) after self-ignition coal gangue hill is administered and used separation layer, be subjected to influence plain in gangue characteristic, the vegetation growth etc., it is breathed freely and what barrier has change, and Changing Pattern how;
3) how to detect the gas penetration potential of separation layer.
The air permeability tester that provides on the market (gas permeameter) is applicable to the ventilative of superpolymer material such as plastic sheet, film, coating and Related product and barrier test more, it is the instrument that detects the wrappage barrier property, be used to measure the instrument of soil or rock permeability, be that medium is tested how with water, or measure the gas permeability (sample dimensions comprises that diameter, thickness are generally a few to tens of millimeters and do not wait) of small-sized sample, can not be used for the test and the barrier simulated experiment thereof of coal gangue hill separation layer soil sample gas penetration potential.
Summary of the invention
The objective of the invention is for solving an above-mentioned difficult problem, a kind of method and apparatus that is used for the test of self-ignition coal gangue hill separation layer gas penetration potential is proposed, being intended to provides method for the gas penetration potential test of separation layer sample in the self-ignition coal gangue hill improvement, the configuration that ensures separation layer has certain obstruct air effect, thereby prevent spontaneous combustion of coal gangue hill, reduce the harm of coal gangue hill, improve the ecologic environment in mining area surrounding environment.
A kind of method that is used for the test of self-ignition coal gangue hill separation layer gas penetration potential that the present invention proposes may further comprise the steps:
1) the airtight air cavity that diameter range is 120～240mm is set, this air cavity is tightly connected successively by three sections cavitys by the gas circuit direction and forms, Upstream section is the gas injection chamber, tract is a discharge chamber, interlude is the test chamber that is placed with soil property sample to be measured, and the sample in the tested chamber of section gas circuit, upstream and downstream cuts off;
2) gas injection chamber in upstream connects air reducing valve of air compressor parallel-series, the instrument of downstream row air cavity connection traffic meter or readable gas flow, and gas injection chamber, upstream and downstream row air cavity are installed a rain glass respectively, the sealing of pipeline junction;
When 3) testing, under the constant condition of the temperature and humidity in the external world, upstream the air-flow of stablizing air pressure is injected in the gas injection chamber, the air pressure size is regulated by air reducing valve, the instrument that the downstream row air cavity is connected is communicated with atmosphere, after treating that upstream and downstream two pressure gauge readings are stable, measure the gas flow that the sample low-pressure side sees through sample, described pressure differential range is between 0.01～0.1MPa;
4) calculate the permeability of sample according to Darcy's law by the Air permenbility of measuring, pressure reduction, sample parameter.
The present invention also proposes to be used for the equipment of self-ignition coal gangue hill separation layer gas penetration potential test, it is characterized in that, this equipment comprises that diameter range is the closed chamber of 120～240mm, this air cavity is tightly connected successively by three sections cavitys by the gas circuit direction and forms, Upstream section is the gas injection chamber, tract is a discharge chamber, the longitudinal length of gas injection chamber and discharge chamber is not less than 1000mm, (it is available to be equipped with two test chambers for the test chamber of placing sample to be tested for interlude, longitudinal length is respectively 300mm and 600mm, separation layer sample with the test different-thickness), on, sample to be tested in the tested chamber of tract gas circuit cuts off; Gas injection chamber, upstream inlet end connects air compressor and air reducing valve (be used for injecting the air-flow of stablizing air pressure to the gas injection chamber, air reducing valve is regulated the air pressure size); The instrument of downstream row air cavity endpiece connection traffic meter or readable gas flow, the instrument outlet section is communicated with atmosphere.
The present invention has following good characteristic:
1. utilize the positive pressure differential method directly to measure the gas penetration potential of sample, low pressure is atmospheric pressure, and high pressure meets the actual air pressure that bears of coal gangue hill separation layer a little more than atmospheric pressure, and test process is simulated the objective reality of self-ignition coal gangue hill separation layer preferably;
2. a kind of testing apparatus of large scale soil property sample gas penetration potential is provided, and as required, but the sample on-site sampling also can be simulated sample preparation in the test lumen, and is flexible;
3. gas injection chamber, test chamber and discharge chamber connect into sealed air-space for three sections, and the closed gas volume is big, and test condition is more stable.
4. device therefor of the present invention is easy to preparation, and is economical and practical, the easy easy operation of method of testing.
Description of drawings
Fig. 1 is a device structure synoptic diagram of the present invention.
Embodiment
A kind of method and apparatus that is used for the test of self-ignition coal gangue hill separation layer gas penetration potential that the present invention proposes reaches embodiment in conjunction with the accompanying drawings and is described in detail as follows:
As shown in Figure 1, equipment can be selected diameter for use
The weldless steel tube that is 120～240mm is made airtight air cavity, and this air cavity divides three sections by the gas circuit direction, and Upstream section is gas injection chamber 1, and tract is a discharge chamber 2, the longitudinal length D of gas injection chamber 1, discharge chamber 2
1, D
2Be not less than 1000mm, interlude (according to the separation layer sample thickness, is selected longitudinal length D for the test chamber 3 that can place sample to be tested
3Test chamber for 300mm or 600mm, separation layer sample with the test different-thickness), connect with flange 4 between three sections, and seal with the rubber flange gasket, gas injection chamber 1 is airtight with discharge chamber 2 opposite side welding steels, welding an aperture that valve is housed on the steel plate respectively is injecting hole 10 and vent port 11, and the separation layer sample to be tested in the tested chamber 3 of upstream and downstream section gas circuit cuts off; The injecting hole 10 in gas injection chamber, upstream 1 connects air reducing valve 6 of air compressor 5 parallel-seriess (be used for injecting the air-flow of stablizing air pressure to the gas injection chamber, air reducing valve is regulated the air pressure size); The vent port 11 of downstream row air cavity 2 connects the instrument 9 (as domestic gas meter) of glass rotameter or readable gas flow, and the instrument outlet section is communicated with atmosphere, and gas injection chamber and discharge chamber also are separately installed with tensimeter 7,8; Whole airtight air cavity is supported by support 12; Connect the junction sealing between each element with withstand voltage gas pipe 13.Equipment carries out seal and bulge test after installing, and guarantees air tight.
In the present embodiment, use diameter
For the weldless steel tube of 159mm is made airtight air cavity, the longitudinal length of gas injection chamber 1, discharge chamber 2 is 1000mm, and the longitudinal length of test chamber 3 is 300mm; The air compressor 5 that install in gas injection chamber 1 is ZB-0.1/8 type (working pressure 0.8MPa), the air reducing valve 6 range-adjustables 0～0.4MPa of series connection; Tensimeter 7 ranges that install in gas injection chamber 1 are 0.1MPa, and tensimeter 8 ranges that discharge chamber 2 is installed are 16KPa, and the pressure reduction in the test process is as the criterion with tensimeter 7 readings; Vent port 11 connects a normal domestic use gas meter 9 (its another interface is communicated with atmosphere).
Method embodiment concrete steps of the present invention are as follows:
1) when test, under ambient temperature and humidity keep stable condition, the separation layer soil property of in test chamber 3, packing into sample, sample periphery tamping or prevent side leakage, and measurement sample thickness L (less than test chamber 3 length) with sealing wax;
2) test chamber 3 two ends and gas injection chamber 1, discharge chamber 2 usefulness flanges 4 and flange gasket are tightly connected; Open air compressor 5, regulate air reducing valve 6, tensimeter 7 pointers when gas injection chamber 1 are stabilized in predetermined experimental pressure value (as 0.01MPa, 0.02MPa, 0.03MPa, 0.1MPa), and when downstream pressure table 8 pointer is stable at zero (force value that gas injection this moment cavity pressure table 7 shows is sample both sides pressure differential deltap P), record pressure also begins to measure gas penetration potential;
3) read gas flow by gas meter 9 and be worth the V (m of unit over time
3), use " with the circle timing " method of stopwatch to write down gas meter fluctuations in discharge time t (s of unit), then Air permenbility Q=V/t simultaneously.
4), calculate the permeability k and the air permeability coefficient K of sample according to Darcy's law according to the Air permenbility Q, the sample both sides pressure differential deltap p that measure, the long-pending A of sample cross (calculating) and length L according to the test chamber internal diameter
αConcrete formula is as follows:
k＝QLμ/AΔP，K
α＝kρg/μ
In the formula, k is the permeability of sample, m
2(or Darcy);
K
αBe the air permeability coefficient of sample, m/s;
Q is the flow that air sees through sample, m
3/ s;
L is a sample thickness, m;
μ is the air movement coefficient of viscosity, Pas;
A is that sample cross is long-pending, m
2
Δ P is sample both sides pressure reduction, the test pressure of gas injection cavity pressure table indication in also promptly testing, Pa;
ρ is the density of air, kg/m
3
G is an acceleration of gravity, m/s
2
Calculated example: test a certain separation layer sample, test pressure is sample both sides pressure differential deltap P=0.02MPa, Air permenbility Q=1.86 * 10
-6m
3/ s, sample thickness L=0.235m, sample cross is amassed A=0.02m
2, as above (ρ gets 1.205kg/m to other parameter of formula substitution in this example
3, g gets 9.81m/s
2, μ gets 1.83 * 10
-5m
2/ s), calculate this separation layer sample air permeability coefficient K
αBe 1.46 * 10
-8M/s, permeability k are 2.26 * 10
-14m
2(0.023Darcy).
Claims (4)
1, a kind of method that is used for the test of self-ignition coal gangue hill separation layer gas penetration potential is characterized in that this method may further comprise the steps:
1) the airtight air cavity that diameter range is 120 ~ 240mm is set, this air cavity is tightly connected successively by three sections cavitys by the gas circuit direction and forms, Upstream section is the gas injection chamber, tract is a discharge chamber, interlude is the test chamber that is placed with soil property sample to be measured, and the sample in the tested chamber of section gas circuit, upstream and downstream cuts off;
2) gas injection chamber in upstream connects air reducing valve of air compressor parallel-series, the instrument of downstream row air cavity connection traffic meter or readable gas flow, and gas injection chamber, upstream and downstream row air cavity are installed a rain glass respectively, the sealing of pipeline junction;
When 3) testing, under the constant condition of the temperature and humidity in the external world, upstream the air-flow of stablizing air pressure is injected in the gas injection chamber, the air pressure size is regulated by air reducing valve, the instrument that the downstream row air cavity is connected is communicated with atmosphere, after treating that upstream and downstream two pressure gauge readings are stable, measure the gas flow that the sample low-pressure side sees through sample, described pressure differential range is between 0.01 ~ 0.1MPa;
4) calculate the permeability of sample according to Darcy's law by the Air permenbility of measuring, pressure reduction, sample parameter.
2, a kind of equipment that is used for the test of self-ignition coal gangue hill separation layer gas penetration potential, it is characterized in that, this equipment comprises that diameter range is the airtight air cavity of 120 ~ 240mm, this air cavity is tightly connected successively by three sections cavitys by the gas circuit direction and forms, Upstream section is the gas injection chamber, and tract is a discharge chamber, and the longitudinal length of gas injection chamber and discharge chamber is not less than 1000mm, interlude is for placing the test chamber of sample to be tested, and the sample to be tested in the tested chamber of section gas circuit, upstream and downstream cuts off; Gas injection chamber, upstream inlet end connects air compressor and air reducing valve; The instrument of downstream row air cavity endpiece connection traffic meter or readable gas flow, the instrument outlet section is communicated with atmosphere.
3, equipment as claimed in claim 2 is characterized in that, described three sections cavitys adopt the weldless steel tube with bore, and this diameter of steel tube is 120 ~ 240mm, connects the flange gasket sealing between each section steel pipe with flange; Two test chambers of this equipment configuration, longitudinal length is respectively 300mm and 600mm.
4, equipment as claimed in claim 3 is characterized in that, described separation layer sample to be measured is a large scale soil property sample, and this specimen finish is identical with the test chamber internal diameter, and this sample thickness scope is between 100 ~ 600mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102258440A CN101393100A (en) | 2008-11-04 | 2008-11-04 | Ventilation property test method and device for hypergolic coal waste pile isolating layer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102258440A CN101393100A (en) | 2008-11-04 | 2008-11-04 | Ventilation property test method and device for hypergolic coal waste pile isolating layer |
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| Publication Number | Publication Date |
|---|---|
| CN101393100A true CN101393100A (en) | 2009-03-25 |
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ID=40493504
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|---|---|---|---|
| CNA2008102258440A Pending CN101393100A (en) | 2008-11-04 | 2008-11-04 | Ventilation property test method and device for hypergolic coal waste pile isolating layer |
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|---|---|
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| CN102323196A (en) * | 2011-05-23 | 2012-01-18 | 申坤 | Design manufacturing and application of triaxial penetration tester |
| CN102875113A (en) * | 2012-09-18 | 2013-01-16 | 中国矿业大学(北京) | Covering flame retardant layer for preventing fire and preventing pollution of natural coal gangue dump |
| CN103398932A (en) * | 2013-07-31 | 2013-11-20 | 中国矿业大学 | Method and device for quickly testing water seepage properties of low-intensity heat-insulating materials for shafts and drifts |
| CN103471977A (en) * | 2013-09-25 | 2013-12-25 | 湖南科技大学 | Detection system and detection method for detecting gas permeability of coal gangue fill |
| CN104048905A (en) * | 2014-04-28 | 2014-09-17 | 上海浦马机电工程技术有限公司 | Permeability detector of mixed minerals and permeability improvement method of mixed minerals |
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| CN103398932A (en) * | 2013-07-31 | 2013-11-20 | 中国矿业大学 | Method and device for quickly testing water seepage properties of low-intensity heat-insulating materials for shafts and drifts |
| CN103471977A (en) * | 2013-09-25 | 2013-12-25 | 湖南科技大学 | Detection system and detection method for detecting gas permeability of coal gangue fill |
| CN103471977B (en) * | 2013-09-25 | 2016-04-13 | 湖南科技大学 | A kind of detection system of gangue obturation gas gas penetration potential and detection method thereof |
| CN104048905A (en) * | 2014-04-28 | 2014-09-17 | 上海浦马机电工程技术有限公司 | Permeability detector of mixed minerals and permeability improvement method of mixed minerals |
| CN106644823A (en) * | 2016-12-21 | 2017-05-10 | 山西大学 | Air tightness testing device for coal wall coating and air tightness testing method applied to air tightness testing device |
| CN108918374A (en) * | 2018-05-11 | 2018-11-30 | 上海大学 | The method of underground interlayer ventilation property test device and test separation layer gas permeability |
| CN108918374B (en) * | 2018-05-11 | 2021-09-21 | 上海大学 | Device and method for testing air permeability of underground interlayer |
| CN108732078A (en) * | 2018-06-13 | 2018-11-02 | 苏州极速安全科技有限公司 | A kind of safety seat production back cushion device for checking air permeability |
| CN109540758A (en) * | 2018-11-02 | 2019-03-29 | 上海交通大学 | It is a kind of for studying the experimental provision of gas flow characteristic in porous structure |
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| CN109540761A (en) * | 2018-11-08 | 2019-03-29 | 河海大学 | A kind of polyurea coating infiltration performance test device |
| CN109540760A (en) * | 2018-11-08 | 2019-03-29 | 河海大学 | A kind of polyurea coating infiltration performance test method |
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