CN101440713A - Technology for harnessing coal mine hydrogen sulfide by using high-voltage pulse liquid injection - Google Patents
Technology for harnessing coal mine hydrogen sulfide by using high-voltage pulse liquid injection Download PDFInfo
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- CN101440713A CN101440713A CN 200810079921 CN200810079921A CN101440713A CN 101440713 A CN101440713 A CN 101440713A CN 200810079921 CN200810079921 CN 200810079921 CN 200810079921 A CN200810079921 A CN 200810079921A CN 101440713 A CN101440713 A CN 101440713A
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Abstract
The invention relates to technology for treating harm in coal mining, in particular to technology for treating sulfureted hydrogen in a coal mine through high-voltage pulse injection. The technology solves the problem that in the prior art a treated coal layer contains high-concentration sulfureted hydrogen. The technology comprises the step of drilling. The technology is characterized in that a sodium carbonate aqueous solution is injected to the coal layer by drilling pulse type high pressure; the injection pressure is between 4 and 5 MPa; the time for single hole injection is between 2 and 3 days; and the concentration of sodium carbonate is 1 percent. Under the condition of not fracturing the coal layer, pulse high-pressure water forms continuous water shock in the inside of the coal layer so as to force original closed cracks inside the coal layer to be communicated or directly form a new crack net inside the coal layer, thereby forming a passage net of water in the coal layer; subsequently, water remained in a permeation passage further permeates a smaller crack of coal layer hole under molecular action; and NaCO3 molecules in the water and H2S molecules in the crack of a coal body react to achieve the aim of removing the sulfureted hydrogen.
Description
Technical field
The present invention relates to a kind of coal mining harm improvement technology, be specially a kind of high-voltage pulse liquid injection that utilizes and administer the coal mine hydrogen sulfide technology.
Background technology
In process of coal mining, it is unusual hydrogen sulfide to occur at the fully-mechanized mining working of some special area, and the hydrogen sulfide that contains in the coal seam overflows in a large number, and regional area surpasses the safety code setting, badly influences the ordinary production of workman's healthy and work plane.Occur after this situation generally is to adopt by adding forced ventilation, spraying aggregate measures such as buck and realized control to hydrogen sulfide.Hydrogen sulfide is colourless gas, has rotten egg sample off-odor during low concentration, makes the people feel that stink is less owing to causing that olfactory nerve is benumbed during high concentration, soluble in water and alcohols, and proportion 1.19 causes the miner to injure so be stranded in the bottom, tunnel in the colliery more.
Specifically, following method is mainly comprehensively taked in traditional improvement hydrogen sulfide harm:
(1) adds forced ventilation: according to the outburst amount of hydrogen sulfide, increased the air quantity of work plane, guaranteed that the hydrogen sulfide gas of the return airway of work plane is reduced to below the safety code required standard.
(2) coal-winning machine spray alkali mist: on equipment train, increased alkaline-water box, and chain with clarified water pump, realize working surface coal mining machine spray alkali mist, the sulfureted hydrogen gas concentration during the control coal cutting.
(3) spill cloth sodium carbonate and quicklime at the work plane crossheading, shed once in per two days, the scope of shedding is tunnel-surrounding and rubber conveyer frame.
(4) twice Chang Kaishui curtain, spacing 10m have been set up in forced working face watering management at the elevating conveyor place.
By taking above comprehensive control measures, controlled the hydrogen sulfide gas of work plane effectively, but existing following problem (1) comprehensive regulation is effective method, but in the various measures of the comprehensive regulation, the ration contribution rate of each method is not accurately measured, and is unfavorable for that follow-up work face takes measures pointedly.
(2) less at the hydrogen sulfide outburst amount of work plane, it is effective adopting said method, under the situation that concentration increases if hydrogen sulfide is gushed out, it is limited only adopting the amplitude that strengthens air quantity and sprinkling buck improvement hydrogen sulfide, must take further step, must gush out from source control hydrogen sulfide to guarantee safety.
Number of patent application be 200710119592.9 disclose a kind of in coal body the method for injecting retarder, in this technology, disclose and in the high-sulfur coal layer, injected alkali lye and can eliminate the hydrogen sulfide in coal seam, prevent that it from gushing out.Its basic mode is to hole on the coal seam, injecting retarder then, sealing of hole again, allow retardant in the coal seam natural seepage flow to reach the target of improvement.But find that in practice for the coal seam of high-concentration hydrogen sulfide, this way is difficult to comprehensively penetrate in the coal seam basically, does not reach expected effect.
Summary of the invention
The present invention to contain the problem of high-concentration hydrogen sulfide in the improvement coal seam that exists in the prior art and provides a kind of high-voltage pulse liquid injection that utilizes to administer the coal mine hydrogen sulfide technology in order to solve.
The present invention is realized by following technical scheme, a kind of high-voltage pulse liquid injection that utilizes is administered the coal mine hydrogen sulfide technology, may further comprise the steps, boring, then boring pulsed high pressure is injected aqueous sodium carbonate, water injection pressure is 4～5Mpa, and the single hole water injection time is generally 2～3d, concentration of sodium carbonate 1%.
Bore diameter is 65mm, and sealing of hole place diameter is 75mm, 0 °～1 ° at the boring angle of depression, and sealing of hole adopts BFK type hole-sealing pump, hole sealing depth 10m cement mortar sealing of hole, spacing of wells 15m, the pulsed high pressure injects aqueous sodium carbonate, whenever finishes a timely sealing of hole in hole.
Zone, the coal seam experimental study of the high-concentration hydrogen sulfide in this mining area,
Test site overview, type approval test are positioned at 19102 work planes in a southern panel, working seam thickness 2.05～2.60m, average 2.3m, 5 °～10 ° of seam inclinations.Work face length 145m advances length 947m, area 137315m
2, the commercial reserves 403166t of work plane, recoverable reserves 383008t, work plane face upward oblique exploitation.
Following research object all is called coal No. 9:
One, No. 9 coal water filling penetration studies
1, the wettability of No. 9 coals
According to surveying and determination, maximum 98.5 ° of No. 9 coal coals-water contact angle, minimum 66.3 °, average 82.4 °.Belong to the more difficult wetting coal seam of pure water.The flood effectiveness of obtaining must be taked two measures or one of them: 1. add wetting agent during water filling; 2. improve water injection pressure, prolong high pressure water injection and time of penetration.
2, No. 9 cleat in coal characteristics
The fractals determination method that adopts Institutes Of Technology Of Taiyuan to propose is measured the crack characteristic of No. 9 coals, and the result is as follows: D=1.7991, N1m=2.73, DN1m=4.91
3, No. 9 coal-bed flooding permeability overall merits
The coal body permeability fuzzy assessment method that the inventor proposes carries out overall merit to the permeability in No. 9 coal seams, and No. 9 the coal seam belongs to III class permeability coal seam, the i.e. medium coal seam of permeability.
Two, pulse dynamic pressure water filling mechanism
According to No. 9 coal coal body architectural feature measurement research, No. 9 comparatively grow the coal cleat, this is to improve infiltrative advantage, but macroscopical crack of No. 9 coals is less relatively, and porosity is low, have influence on flood effectiveness, therefore, under this coal seam conditions, water filling should be followed two engineering philosophies, one: should manage to increase macroscopical crack quantity, promote the communication of macroscopical crack and cleat; Its two because porosity is less, water injection time should extend.
Studies show that, working face wall in the bearing pressure peak point scope because the effect of leading bearing pressure, the crack is reached full growth, from then on the meaning, flood effectiveness is better in this scope, but the stope fltting speed is very fast, and the time that water is stopped in the coal seam is too short, and water is fully entered in the micro hole-crack of coal body.For solving the permeability problems of stress of primary rock district longhole infusion, guarantee flood effectiveness, adopt the high voltage pulse water injection technology.
As previously mentioned, the process of osmosis of water in the coal seam is divided into: water is done turbulent flow or laminar motion along the crack in the coal seam with than macrovoid under pressure, in this course water under pressure, be full of all inherent cracks of inside, coal seam, external crack, regeneration crack and connect mutually than macrovoid; The water that retains in subsequently in the above-mentioned internal construction in coal seam penetrates in coal seam minute aperture, the crack under the effect of capillary force and molecular diffusion motoricity, the quality of coal seam infusion effect, and the size in hole, coal seam, crack and the degree that connects mutually are crucial.In order to make water annotate into coal body inside effectively, just at first need inner formation can make water be penetrated into the hole-fracture network that is mutually related of coal body inside in the coal seam.
The pulsed the injecting process is exactly to utilize the pulsating water pressure water attack that cyclically-varying produced and " water is split " effect in coal body water injecting drilling inside, force the macroscopic view in the coal seam progressively to expand UNICOM, and impel small empty crack formation and open gradually, form new regeneration fracture network, the infiltration lane of water in the coal seam is provided, water under high pressure is penetrated into wherein gradually, the pulsed water under high pressure reach gradually the minute fissure in the coal body is connected mutually in, water also is penetrated into wherein, realizes moistening to coal body thereby the water that enters into these cracks further is penetrated into littler porous dehiscence crack, coal seam under the effect of molecular force and capillary force.
The process of coal seam pulsed high pressure water injection can be described as: the pulsed water under high pressure is linked up original porous dehiscence crack and form new porous dehiscence crack in the coal seam, constitute the network of channels that water permeates in coal body, retain in water in the infiltration lane subsequently under the effect of molecular force and capillary force, further be penetrated in the littler porous dehiscence crack, coal seam.This process of pulsed coal-bed flooding is an incremental process, and its maximum impulse hydraulic pressure is limited in the scope that can not cause coal seam roof and floor destruction.
Three, absorption liquid is selected experimental study:
1, Na
2CO
3Can be used as H
2The good absorbent of S is with Na
2CO
3Absorbent with same function also has NaOH (NaOH), for comparing the assimilation effect of the two, carries out absorption liquid and selects test, finally determines absorbent.
NaOH, sodium carbonate liquor absorbing hydrogen sulphide are adopted in experiment, and experimental result sees Table 1.
Table 1 absorption liquid is selected experimental result
NaOH can thoroughly absorb hydrogen sulfide, but its alkalescence is too strong, the easy and sulfide generation polysulfide of the sulphur that oxidation generates under the highly basic condition, and then generation generates the side reaction of thiosulfate.The corrosivity of sodium hydroxide addition solution is stronger, and processing cost is higher.Sodium carbonate can thoroughly absorb hydrogen sulfide, and its cost and corrosivity are all less.If control alkaline concentration well, can suppress the generation of thiosulfate and other impurity well.The Comprehensive Experiment result selects sodium carbonate to make absorbent.
The experiment of 2 sodium carbonate absorption liquid suitable concentrations
In order to determine of the influence of aqueous sodium carbonate concentration to hydrogen sulfide absorption, carried out the condition experiment of 5 kinds of concentration, experimental result sees Table 2.
By table 2 data as can be seen: the concentration of sodium carbonate liquor is low excessively to be unfavorable for absorbing; The side reaction of thiosulfate easily takes place to generate in excessive concentration, therefore selects W (Na
2CO
3) be that 1% to 5% sodium carbonate liquor is more suitable.
Table 2 sodium carbonate liquor concentration experimental result
| W(Na 2CO 3) | Absorptivity | | Remarks | |
| 1％ | ≧90％ | Few | Absorptive capacity is less | |
| 2％ | ≧95％ | Few | ||
| 3％ | ≧99％ | Few | ||
| 5％ | ≧99％ | |
||
| 10％ | ≧99％ | Many | Easily generate thiosulfate |
Table 3 work plane positive lane water injection rate and add alkali number
| The boring numbering | Hole depth (m) | Aperture (mm) | Hole sealing depth (m) | Water injection pressure MPa | Water injection rate (m 3) | Add alkali number (kg) | Annotate at 2005 on |
| 2 | 91 | 65 | 11 | 5 | 30 | 375 | 10.21～10.22 |
| 3 | 91 | 65 | 11 | 5 | 30.5 | 375 | 10.22～10.23 |
| 4 | 70 | 65 | 10 | 4 | 24.5 | 300 | 10.24 |
| 5 | 110 | 65 | 11 | 4 | 36.5 | 425 | 10.25～10.27 |
| 6 | 95 | 65 | 12 | 4 | 29.9 | 500 | 10.27～10.27 |
| 7 | 110 | 65 | 12 | 5 | 37 | 500 | 10.30～10.31 |
| 8 | 81 | 65 | 10 | 4 | 33 | 475 | 11.1～11.2 |
| 9 | 105 | 65 | 10 | 4 | 36.9 | 525 | 11.2～11.4 |
| 10 | 50 | 65 | 9 | 4 | 22 | 325 | 11.4～11.5 |
| 11 | 80 | 65 | 8 | 4 | 35.4 | 550 | 11.6～11.7 |
| 12 | 95 | 65 | 10 | 4 | 32 | 460 | 11.8～11.9 |
| 14 | 60 | 65 | 10 | 4 | 31.5 | 425 | 11.9～11.11 |
| 15 | 100 | 65 | 10 | 4 | 38.6 | 400 | 11.11～11.13 |
| 16 | 51 | 65 | 10 | 4 | 26.2 | 225 | 11.14～11.15 |
| 17 | 90 | 65 | 10 | 4 | 35.4 | 325 | 11.15～11.16 |
| 18 | 96 | 65 | 10 | 4 | 41.2 | 300 | 11.16～11.17 |
| 19 | 105 | 65 | 10 | 4 | 36.1 | 350 | 11.18～11.19 |
| 20 | 50 | 65 | 10 | 4 | 21 | 200 | 11.19 |
| 21 | 110 | 65 | 10 | 4 | 31 | 300 | 11.20 |
| 22 | 105 | 65 | 10 | 4 | 34 | 300 | 11.21 |
| 23 | 90 | 65 | 10 | 4 | 30.6 | 300 | 11.22 |
| 24 | 90 | 65 | 10 | 4 | 31.2 | 300 | 11.23 |
| 25 | 95 | 65 | 10 | 4 | 33.1 | 325 | 11.24～11.25 |
| 27 | 110 | 65 | 10 | 4 | 40.2 | 400 | 11.26～11.27 |
| 28 | 98 | 65 | 10 | 4 | 30.7 | 300 | 11.27～11.28 |
| 29 | 107.5 | 65 | 10 | 4 | 36.3 | 350 | 11.28～11.29 |
| 30 | 105 | 65 | 10 | 4 | 31.1 | 300 | 11.30 |
| 31 | 75 | 65 | 10 | 4 | 31.2 | 350 | 12.1 |
Annotate the alkali effect assessment
The hydrogen sulfide severe overweight was once once appearring in the work plane driving, be up to 100ppm, obviously, do not administer if do not annotate alkali, the concentration of hydrogen sulfide of gushing out in the stope manufacturing process will be much larger than 100ppm, and the work plane air return way begins to annotate alkali on December 19th, 2005, the air intake crossheading was also annotated alkali in previous month in working face mining, after annotating alkali, controlled concentration of hydrogen sulfide effectively, the concentration of hydrogen sulfide behind the notes alkali changes to be seen shown in Fig. 6-1.As seen from the figure, behind the notes alkali, the concentration of hydrogen sulfide is 7.2ppm to the maximum, and minimum is 0ppm, for No. 9 coals of safe working have been created condition.
Can show that by above research it is feasible, effective adopting deep hole to annotate alkali technology improvement coal wall hydrogen sulfide gas.Pulse dynamic pressure water filling and notes alkali technology are combined in and administer hydrogen sulfide in the conditions of similarity mine is efficient, practical.Have great social benefit: this experimental face, mining area hydrogen sulfide is administered successfully, not only safe working these two work planes in this ore deposit, also provide technical guarantee for No. 9 follow-up coal minings of this ore deposit, No. 9 coal still has reserves 3823.2 ten thousand t, the possibility that all has hydrogen sulfide to transfinite, therefore, this technology has prolonged the length of service of mine, stablized the workforce, made positive contribution guaranteeing one's respective area expanding economy, social stability.The present invention is the important breakthrough of China's mine disaster Prevention Technique, greatly abundant and perfect China's diaster prevention and control theory.
Description of drawings
Fig. 1 is for annotating behind the alkali transportation and air return way concentration of hydrogen sulfide with the advance of the face (100-200 rice) variation diagram
Fig. 2 is for annotating behind the alkali transportation and air return way concentration of hydrogen sulfide with the advance of the face (200-400 rice) variation diagram
Fig. 3 is for annotating behind the alkali transportation and air return way concentration of hydrogen sulfide with the advance of the face (400-600 rice) variation diagram
Fig. 4 is that pulsed dynamic pressure flood pattern is formed and the operating principle schematic diagram
Fig. 5 is a coal seam pulsed high pressure water injection system drawing
Fig. 6 is the positive lane of a working face of coal seam borehole pattern
Among the figure: 1-High-pressure watermeter, 2-water filling integrated package, 3-double plunger high-pressure pump, 4-pressure regulator, 5-pressure display unit, 6-water inlet strainer, 7-static pressure water pipe, 8-water tank, 9-threeway, 10-suction water pipe, 11-dynamic pressure water pipe, 12-weep pipe, 13-water injection pipe, 14-coal seam, 15-liquid injection hole
The specific embodiment
A kind of high-voltage pulse liquid injection that utilizes is administered the coal mine hydrogen sulfide technology, may further comprise the steps, and boring is injected aqueous sodium carbonate to boring pulsed high pressure then, and water injection pressure is 4～5Mpa, and the single hole water injection time is generally 2～3d, concentration of sodium carbonate 1%.
Bore diameter is 65mm, and sealing of hole place diameter is 75mm, 0 °～1 ° at the boring angle of depression, sealing of hole after the water filling, hole sealing depth 10m cement mortar sealing of hole.
Pulse dynamic pressure flood pattern and equipment that the pulsed high-pressure injection uses.As schematically shown in Figure 4, pulsed dynamic pressure flood pattern is formed and operating principle
MKZ type system is adopted in this ore deposit, mainly by pressure regulator, pressure display unit, water filling integrated package, ZGS type High-pressure watermeter and the water filling pressure duct of 2BZ-40/12 type pulsed coal-bed flooding pump, band throttling arrangement, static pressure water filter, control behind the feed tank BFK type hole-sealing pump etc. automatically and form.The BPZ75/12 type high-pressure pump of double plunger and pressure regulator, pressure display unit constitute an organic whole, form the main body of coal seam high voltage pulse flood pattern.With 2BZ-40/12 type pulsed coal-bed flooding pump is that the coal seam pulsed high pressure water injection system principle that main body constitutes illustrates that as shown in Figure 4 coal seam pulsed high pressure water injection system drawing as shown in Figure 5.
The running of motor drives 2BZ-40/12 type pulsed coal-bed flooding pump, the high voltage pulse water of output enters the pressure regulator of band throttling arrangement, pressure regulator is according to the deep and thorough ability in coal seam, guaranteeing to have under the precursor of enough pulsating water pressure degree, automatically the size of the water yield is exported in control, pulse strength is shown that by pressure display unit pressure meter is used for accurate short-time pulse pressure measxurement, and pressure shows that servicing unit is used for pulse hydraulic pressure tracking measurement.
The water under high pressure that is the height pulse injects the process of inside, coal seam by pipe-line system, under pressure break coal seam conditions not, high voltage pulse water is the inner water hammer that produces in the coal seam, make preexisting crack link up or produce new crack network, the network channel of water in the coal seam internal flow is provided, and static pressure water arrives inside, coal seam by these network penetration.How much showing of coal seam injected water volume by High-pressure watermeter.
Drill holes and water injection technology
1, drill holes
In the work plane crossheading tunneling process, find that one concentrated lane 550m～850m is the high-hydrogen sulfide band apart from south, the instantaneous concentration that hydrogen sulfide is the highest once reached 100ppm, for this reason, adjusted former schematic design, at air return way (adhesive tape lane, Zheng Xiang) the notes alkali of in 550m～850m scope, before sealing-tape machine is installed prerequisite, drilling, in work plane haulage gate (positive lane), 31 of alkali borings are annotated in construction, boring total length 2532m, the longest boring length is 110m, stub boring hole length 27m, average 82m, the spacing of wells is got 10m.Arrange that at the every 20m of work plane air intake crossheading (secondary lane) is annotated an alkali boring, drilling depth is divided into two kinds of situations: 1. annotate 27 of alkali borings, boring total length 1575m, the longest 80m with air return way boring opposite position (in 550m～850m scope) construction, the shortest 27m, average 58.3m; 2. remainder is got 2/3 of face length.Boring is parallel to stope and arranges.
Need to prove, annotate in the alkali process, the adjacent boring phenomenon of metalling run out occurred, illustrate that the spacing of wells is too little, therefore, when the drill holes of secondary lane, get the 20m spacing at air return way (positive lane).
The positive lane of 19102 work planes drill holes is seen Fig. 6:
2 water fillings (alkali) technology
(1) water filling (alkali) rig
Adopt the boring of MK-3 type rig, the rig important technological parameters is as follows:
Drilling depth: 150m, drill pipe diameter: 42mm, dip angle of hole: 0～90 °, gyrator output torque: 660N.m, feed stroke: 650mm, feed ability: 24kN, hydraulic system rated pressure: 16MPa, fire-proof motor model: YBK2-160L-4, power: 15Kw, fuel tank dischargeable capacity: 85L, main frame appearance and size: 1.78 * 0.6 * 1.3m, rig quality (except that motor, oil pipe): 700kg
(2) water filling (alkali) equipment, employing MKZ moulded coal layer pulsed high pressure water injection system.In storage tank, press design concentration and add sodium carbonate, concentration 1%.
(3) notes alkali time, positive lane have all been annotated alkali and have been finished before working face mining, and secondary lane was annotated alkali near the work plane coal body and finished in the previous moon of working face mining, annotated alkali successively with the advance of the face later on.
(4) data of holes drilled, bore diameter are 65mm, and sealing of hole place diameter is 75mm, hole sealing depth 10m cement mortar sealing of hole.0 °～1 ° at the boring angle of depression.
(5) water injection pressure, water injection pressure are 4～5MPa
(6) water injection time, single hole water injection time are generally 2～3d
(7) technology tissue, single hole water filling, the continuous water filling of class Three.
Claims (1)
1, a kind of high-voltage pulse liquid injection that utilizes is administered the coal mine hydrogen sulfide technology, may further comprise the steps boring, it is characterized in that: then boring pulsed high pressure is injected aqueous sodium carbonate, water injection pressure is 4～5Mpa, and the single hole water injection time is generally 2～3d, concentration of sodium carbonate 1%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102619497A (en) * | 2012-04-11 | 2012-08-01 | 中国石油天然气股份有限公司 | Treating agent as well as method and device for continuously reducing hydrogen sulfide in oil well shaft |
| CN104594901A (en) * | 2014-12-08 | 2015-05-06 | 太原理工大学 | Method for enabling working face to pass through igneous rock intrusion area |
| CN104675430A (en) * | 2015-03-04 | 2015-06-03 | 山西潞安环保能源开发股份有限公司 | High-hydrogen-sulfide coal seam roadway construction advanced alkali injection process and alkali liquid formula |
| CN110206582A (en) * | 2019-04-19 | 2019-09-06 | 铜陵有色金属集团股份有限公司 | Nonferrous metal mine hydrogen sulfide method for integrated control |
| CN112588095A (en) * | 2020-11-05 | 2021-04-02 | 太原理工大学 | Application method of device for treating hydrogen sulfide gas in coal body of coal face |
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2008
- 2008-11-25 CN CN 200810079921 patent/CN101440713A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102619497A (en) * | 2012-04-11 | 2012-08-01 | 中国石油天然气股份有限公司 | Treating agent as well as method and device for continuously reducing hydrogen sulfide in oil well shaft |
| CN102619497B (en) * | 2012-04-11 | 2015-05-06 | 中国石油天然气股份有限公司 | Method for continuously reducing hydrogen sulfide in oil well shaft |
| CN104594901A (en) * | 2014-12-08 | 2015-05-06 | 太原理工大学 | Method for enabling working face to pass through igneous rock intrusion area |
| CN104675430A (en) * | 2015-03-04 | 2015-06-03 | 山西潞安环保能源开发股份有限公司 | High-hydrogen-sulfide coal seam roadway construction advanced alkali injection process and alkali liquid formula |
| CN110206582A (en) * | 2019-04-19 | 2019-09-06 | 铜陵有色金属集团股份有限公司 | Nonferrous metal mine hydrogen sulfide method for integrated control |
| CN110206582B (en) * | 2019-04-19 | 2021-06-08 | 铜陵有色金属集团股份有限公司 | Comprehensive prevention and control method for hydrogen sulfide of nonferrous metal mine |
| CN112588095A (en) * | 2020-11-05 | 2021-04-02 | 太原理工大学 | Application method of device for treating hydrogen sulfide gas in coal body of coal face |
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Open date: 20090527 |