CN102296982B - Method for electrochemically strengthening desorption and seepage of coal gas - Google Patents
Method for electrochemically strengthening desorption and seepage of coal gas Download PDFInfo
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- CN102296982B CN102296982B CN 201110130935 CN201110130935A CN102296982B CN 102296982 B CN102296982 B CN 102296982B CN 201110130935 CN201110130935 CN 201110130935 CN 201110130935 A CN201110130935 A CN 201110130935A CN 102296982 B CN102296982 B CN 102296982B
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Abstract
The invention discloses a method for electrochemically strengthening desorption and seepage of coal gas, belonging to the field of coal bed gas extraction and coal electrochemical modification technologies. The method is characterized in that a coal body temperature is raised through changing electricity, chemistry, mineralogy and petrography characteristics of coal and fracture and pore structures of coal under the combined action of an external electric field and an electrolyte to generate gases, reduce activation energy and decrease adsorption potential so as to strengthen the desorption and the seepage of the coal gas, thus the gas extraction efficiency of coal beds is increased. In the method, holes are drilled in a heading or working face and electrodes are arranged in the holes, the external electric field is an alternating-current electric field or direct-current electric field, and the electrolyte is an alkali electrolyte. Compared with the traditional method for increasing the gas extraction efficiency of the coal beds, the method has the advantage that the gas extraction efficiency of the coal beds is increased by 10-30 percent through the electrochemical strengthening.
Description
Technical field
The method of a kind of electrochemically strengthening coal of the present invention desorption of mash gas seepage flow, the category that belongs to coal bed gas extraction and coal electrochemical modification technology, a kind of Desorption And Seepage of strengthening coal gas under extra electric field and electrolyte acting in conjunction specifically, purpose is to improve the electrochemically strengthening method of coal bed gas extraction rate.
Background technology
The average extraction rate of China's coal-bed gas is only 20% left and right, and the coal bed gas extraction rate of the main producing coal country such as the U.S., Australia is more than 50%, its main cause is that the Desorption And Seepage of China's coal-bed gas is poor, and not yet find the Desorption And Seepage that can significantly improve coal-bed gas, to improve the technical method of coal bed gas extraction rate.
The existing method that improves the coal-bed gas Desorption And Seepage is summarized as three classes: the first kind be adopt waterpower with blast cracking, boring and slot release, Mining Protective Seam, dig lane and boring in high-order fissure zone, and the pressure relief method such as construction multi-branched horizontal well.These class methods are to make coal deformation by release, and separate the de-stress barrier, make the increase of coal desorption of mash gas seepage flow.But release can not make coal body fully broken, can only make coal body produce distortion and crack among a small circle, and the coal cinder body that is cut by the crack is still very large, improves the effect of coal desorption of mash gas seepage flow and is limited in scope.Equations of The Second Kind is to make the increase of coal desorption of mash gas seepage flow by methods such as gas injection displacement and displacement in floodings.The gas that injects in the coal seam is mainly CO
2, N
2Or flue gas, these gases compare CH in the coal seam
4Have stronger absorption affinity, substantially do not changing under the condition of coal seam reservoirs pressure, can improve the reservoir pressure coefficient of conductivity and the absorption displacement effect of competing, but this gas injection method of replacing should not be used in the underground coal exploitation.But high pressure water injection displacement pressure break coal seam, fluid in the crack has higher pore pressure, help to make the crack to be held open state and desorption of mash gas, but the water in the coal seam can seal the passage of Gas Flow, and gas is pushed to coal body is inner, water also plays certain inhibitory action to the desorb of gas, when only having the coal seam water of discharge, can cause that just pressure drop and gas discharge.The 3rd class is to make the increase of coal desorption of mash gas seepage flow by the method that adds the physical fields such as thermal field, earth electric field, electromagnetic field and sound field.But coal is weak heat-conductivity conducting body, and directly impact adds the physical fields such as thermal field, earth electric field, electromagnetic field and sound field to the action effect of coal.
Under the acting in conjunction of extra electric field and electrolyte, coal is degraded on the one hand, is gasified and the electrochemical reaction such as reduction, and the electrokinetic phenomenas such as electric osmose and electrophoresis occur on the other hand.Electrochemical reaction and electrokinetic phenomena make coal that following variation occur: 1. the chemistry of coal, mineralogy and lithology structure change, produce gas.The variation of texture of coal causes cleat in coal and pore structure to change, and the aperture increases, and the gas migration passage increases, and has strengthened the Desorption And Seepage of coal gas.The gas that produces is to the gas absorption displacement effect of competing.2. the temperature of coal raises.Temperature raises and causes the activation energy of coal adsorption gas to reduce, and absorption potential reduces, and the desorption of mash gas amount increases, and diffusion velocity increases, the seepage flow enhancing.3. electrokinetic phenomena makes the solid liquid phase in coal produce displacement, and gas is produced the displacement effect.
Summary of the invention
The method of a kind of electrochemically strengthening coal of the present invention desorption of mash gas seepage flow, purpose is to overcome shortcomings and deficiencies of the prior art, provide a kind of under extra electric field and electrolyte acting in conjunction, change electricity, chemistry, mineralogy and the lithology feature of coal, and the crack of coal and pore structure, produce gas, the coal temperature that raises, reduce activation energy, reduce absorption potential, by strengthening the Desorption And Seepage of coal gas, purpose is to improve the electrochemically strengthening method of coal bed gas extraction rate.
The method of a kind of electrochemically strengthening coal of the present invention desorption of mash gas seepage flow, it is characterized in that a kind of electricity, chemistry, mineralogy and lithology feature of passing through to change coal under extra electric field and electrolyte acting in conjunction, and the crack of coal and pore structure, produce gas, the coal temperature that raises, reduce activation energy and reduce absorption potential, to strengthen the electrochemically strengthening method of coal desorption of mash gas seepage flow, concrete step is:
I, hole in heading, build electrochemically strengthening coal desorption of mash gas osmotic system, the critical piece of building this system comprises tunnel 1, boring 2, electrode 3, hole packer 4, advances electrolyte pipe 5, wire 6, extra electric field 7 and ammeter 8;
II, arrange electrode 3 in boring, electrode 3 materials are Fe or Cu, and electrode 3 length are determined by boring 2 degree of depth, electrode 3 length are 1/3～2/3 of boring 2 degree of depth, adjacent electrode is connected with the both positive and negative polarity of extra electric field 7 with ammeter 8 by wire 6, and hole packer 4 sealing of holes are annotated electrolyte;
III, extra electric field 7 are AC field or DC electric field, and electric-field intensity is 0～10Vcm
-1, electrolyte is alkaline electrolyte NaOH, KOH, Ca (OH)
2, concentration is 0～5moll
-1
IV, the standard that stops electrochemically strengthening are: electrode material 3 exhausts, and current strength is 0, or the rib of heading 1 area to occur be that 30%～50% electrolyte oozes out phenomenon.
The method of a kind of electrochemically strengthening coal of the present invention desorption of mash gas seepage flow is compared with the existing method that improves coal gas pumping rate, has following outstanding substantive distinguishing features and significant effect:
1, the method for a kind of electrochemically strengthening coal of the present invention desorption of mash gas seepage flow, it is characterized in that: be a kind of chemistry, mineralogy and lithology feature of passing through to change coal under extra electric field and electrolyte acting in conjunction, and the crack of coal and pore structure, produce gas, the coal temperature that raises, reduce activation energy, reduce absorption potential, to strengthen the electrochemically strengthening method of coal desorption of mash gas seepage flow, purpose is to improve the coal bed gas extraction rate.
2, the method for a kind of electrochemically strengthening coal of the present invention desorption of mash gas seepage flow, electrochemically strengthening can make coal gas pumping rate improve 10%～30%.
3, the method for a kind of electrochemically strengthening coal of the present invention desorption of mash gas seepage flow is widely used under coal mine the gas in recovery process and discharges in advance, prevents coal and Gas Outburst, dustproof, control bump, softening top coal, improves the top coal and emit the aspects such as putting property.
Description of drawings
Fig. 1 is the electrode arrangement mode of electrochemically strengthening coal desorption of mash gas seepage flow.
In figure: tunnel 1, boring 2, electrode 3, hole packer 4, advance electrolyte pipe 5, wire 6, extra electric field 7 and ammeter 8.Fig. 1 (a) is vertical or oblique tunnel rib (work plane) single-sided electrode arrangement; Fig. 1 (b) is vertical or oblique tunnel rib bilateral electrode arrangement mode.
The specific embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.
Embodiment 1:
By the method for electrochemically strengthening coal desorption of mash gas seepage flow of the present invention, electrochemically strengthening coal desorption of mash gas seepage flow is carried out in the coal-face coal seam, purpose is to improve the extraction rate of coal-bed gas.Process is:
I, in certain ore deposit 3
#Hole in heading, according to the electrochemically strengthening coal desorption of mash gas osmotic system shown in Fig. 1 (a), it is carried out electrochemically strengthening;
II, oblique tunnel rib single-sided arrangement electrode, electrode material is Fe, and electrode length is 2/3 of drilling depth, and adjacent electrode is connected with the both positive and negative polarity of extra electric field and ammeter, and sealing of hole is annotated electrolyte;
III, extra electric field are DC electric field, and electric-field intensity is 0.25Vcm
-1～6.6Vcm
-1, NaOH electrolyte, concentration is 0.5mol1
-1
It is that 30% electrolyte stops invigoration effect when oozing out that area appears in the rib of IV, heading 1.
Coal bed gas extraction rate after electrochemically strengthening improves approximately 27%.
Embodiment 2: according to the electrochemically strengthening coal desorption of mash gas osmotic system shown in Fig. 1 (a), vertical operation face single-sided arrangement electrode, electric-field intensity is 1Vcm
-1, electrolyte is water, coal bed gas extraction rate after electrochemically strengthening improves approximately 11%.Other is with embodiment 1.
Embodiment 3: according to the electrochemically strengthening coal desorption of mash gas osmotic system shown in Fig. 1 (b), oblique tunnel rib bilateral is arranged electrode, and electric-field intensity is 1Vcm
-1, electrolyte is KOH, concentration is 0.5moll
-1, coal bed gas extraction rate after electrochemically strengthening improves approximately 17%.Other is with embodiment 1.
Claims (1)
1. the method for an electrochemically strengthening coal desorption of mash gas seepage flow, it is characterized in that a kind of under extra electric field and electrolyte acting in conjunction chemistry, mineralogy and lithology structure, crack and the pore structure by changing coal, produce gas, the coal temperature that raises, reduce activation energy and reduction absorption potential, to strengthen the electrochemically strengthening method of coal desorption of mash gas seepage flow, concrete step is:
I, hole in heading, build electrochemically strengthening coal desorption of mash gas osmotic system, the critical piece of building this system comprises tunnel (1), boring (2), electrode (3), hole packer (4), advances electrolyte pipe (5), wire (6), extra electric field (7) and ammeter (8);
II, arrange electrode (3) in boring, electrode (3) material is Fe or Cu, electrode (3) length is determined by boring (2) degree of depth, electrode (3) length is 1/3 ~ 2/3 of boring (2) degree of depth, adjacent electrode is connected with the both positive and negative polarity of extra electric field (7) with ammeter (8) respectively by wire (6), hole packer (4) sealing of hole is annotated electrolyte;
III, extra electric field (7) are AC field or DC electric field, and electric-field intensity is 0～10Vcm
-1, electrolyte is alkaline electrolyte NaOH, KOH or Ca (OH)
2, concentration is 0～5moll
-1
IV, the standard that stops electrochemically strengthening are: electrode (3) exhausts, and electric current is 0, or the rib of heading (1) area to occur be that 30% ~ 50% electrolyte oozes out phenomenon.
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| CN102296982B true CN102296982B (en) | 2013-05-08 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636546B (en) * | 2012-04-24 | 2014-02-12 | 太原理工大学 | Testing device for changing adsorption and desorption performances of coal rock gas in electrochemical way |
| CN102817631B (en) * | 2012-08-20 | 2014-11-05 | 山西煤炭运销集团科学技术研究有限公司 | Method for draining gas of upper adjacent layer of mine |
| CN102817632B (en) * | 2012-08-20 | 2014-11-05 | 山西煤炭运销集团科学技术研究有限公司 | Method for draining gas of mining layer of mine |
| CN103061766B (en) * | 2013-01-11 | 2015-07-15 | 河南理工大学 | Method for preventing and controlling coalbed rockburst through chemical reaction |
| CN106437638B (en) * | 2016-10-10 | 2019-11-12 | 太原理工大学 | A kind of method that electrochemistry improves coal bed gas recovery ratio |
| CN106593388B (en) * | 2016-12-22 | 2019-02-22 | 中国矿业大学 | A kind of coal bed gas well electrical pulse blocking removing seepage increasing method |
| CN108049850B (en) * | 2017-11-01 | 2020-02-21 | 太原理工大学 | Pressure-dynamic-electric coupling enhanced coal seam water injection method |
| CN114320293A (en) * | 2022-01-12 | 2022-04-12 | 辽宁工程技术大学 | Coal pillar type rock burst control method based on electric pulse |
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