CN105804753A - Carbon dioxide blasting-based method for weakening top caving coal on hard coal seam - Google Patents

Carbon dioxide blasting-based method for weakening top caving coal on hard coal seam Download PDF

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Publication number
CN105804753A
CN105804753A CN201610263144.5A CN201610263144A CN105804753A CN 105804753 A CN105804753 A CN 105804753A CN 201610263144 A CN201610263144 A CN 201610263144A CN 105804753 A CN105804753 A CN 105804753A
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carbon dioxide
coal
boring
coal seam
explosion
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CN201610263144.5A
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CN105804753B (en
Inventor
朱志洁
陈蓥
宋卫华
张宏伟
李胜
韩军
霍丙杰
汤国水
兰天伟
孙宝志
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Liaoning Technical University
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Liaoning Technical University
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C41/00Methods of underground or surface mining; Layouts therefor
    • E21C41/16Methods of underground mining; Layouts therefor
    • E21C41/18Methods of underground mining; Layouts therefor for brown or hard coal
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C37/00Other methods or devices for dislodging with or without loading
    • E21C37/06Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
    • E21C37/14Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by compressed air; by gas blast; by gasifying liquids

Abstract

The invention belongs to the technical field of coal mining, in particular to a carbon dioxide blasting-based method for weakening top caving coal on a hard coal seam. The method comprises the steps of setting drill holes penetrating through a top caving coal body to a coal seam roof at an interval of 5 to 8 hydraulic supports at the roof close to the coal wall between top beams of the two hydraulic supports, placing a carbon dioxide fracturing device in the drill holes, sequentially blasting carbon dioxide according to the drill hole order, and finally, generating fractures in the hard top coal, and weakening the strength. After the hard top coal is weakened by carbon dioxide blasting, the top-coal recovery rate is improved by 20% to 30% compared with that prior roof fracturing, the fracturing effect is obvious, and the economic benefits are remarkable.

Description

A kind of method weakening hard coal seam Sub-Level Caving based on carbon dioxide explosion
Technical field
The invention belongs to Coal Mining Technology field, be specifically related to a kind of method weakening hard coal seam Sub-Level Caving based on carbon dioxide explosion.
Background technology
In hard coal seam top coal caving, the prominent technical barrier run into push up exactly coal can not voluntarily fully broken, top-coal control lumpiness is big, can not release from support coal discharge outlet, thus causing coal recovery rate low, Residual coal in goaf leaves the hidden danger of spontaneous combustion more, threatening mine safety, the existing method solving this difficult problem is coal seam high pressure water injection or explosion.
Wherein, coal seam high pressure water injection always has crack to produce under Action of Fixed Abutment Pressure, water under high pressure easily releases along coal seam preexisting crack (including initial fissure and the crack of Action of Fixed Abutment Pressure generation), but fracturing action direction is obvious, being not easily the prose style free from parallelism that lumpiness is moderate by breaking of roof coal, coal-bed flooding simultaneously affects ature of coal.
In crossheading, explosion is to transport suitable lane groove and return airway groove to pushing up coal drillhole blasting at work surface, owing to this method is deep hole blasting, easily cause big gun hole and blocked real, work surface two ends there will be explosion blind area, the extraction of top coal can be affected, adopt the method quantities relatively big, and the belt transportation system of blasting procedure and haulage gate collides with each other;Technique lane explosion weaken take full advantage of explosion weaken rear abutment pressure can the shattering process of pressure break again, reached reduction lumpiness, improve the purpose of top coal recovery rate, but add the driving amount in tunnel so that work surface investment is bigger.At present, top coal recovery rate is low is technical barrier urgently to be resolved hurrily in hard coal seam top coal caving.
Summary of the invention
For prior art Problems existing, the present invention provides a kind of method weakening hard coal seam Sub-Level Caving based on carbon dioxide explosion, purpose is upward to push up coal perforating near the top board place of rib by employing between working surface hydraulic support back timber to carry out carbon dioxide explosion, top hard coal is weakened, reduces investment outlay, improve safety.
Realize the technical scheme of the object of the invention, carry out according to following steps:
(1) in carrying out coal seam exploitation process, near the top board place of rib between hydraulic support top beam, arranging the boring penetrating top coal coal body arrival roof at interval of 5~8 hydraulic supports, boring and roof are certain inclination alpha, and the length of boring is L;
(2) carbon dioxide fracturing device is placed in boring, it is inserted at the bottom of hole, adopt bag type paste or rubber hole packer sealing of hole, sealed borehole length is (0.1~0.2) L, and setting only flies device, connects wire, exploder is used to start heater, it is sequentially carried out carbon dioxide explosion according to boring order, finally makes top hard coal produce crack, weakening strength.
Wherein, described bore diameter is 60mm~80mm, and the distance between adjacent two borings is 8m ~ 10m.
Described boring and roof are certain inclination alpha is 30 ° ~ 60 °.
The described back production along with work surface implements carbon dioxide explosion at interval of certain distance at top coal, i.e. explosion circulation step pitch≤L × cos α.
Described use exploder starts heater, making the liquid carbon dioxide within heating carbon dioxide fracturing device become gas, in carbon dioxide fracturing device, pressure continues to increase compressing 200MPa level pressure and shears sheet so that it is in level pressure to shear sheet disrumpent feelings, release gases at high pressure, fracturing coal body.
Compared with prior art, the feature of the present invention and providing the benefit that:
The present invention adopts carbon dioxide explosion that top hard coal is weakened, and specifically between working surface hydraulic support back timber, the top board place upwards perforating of close rib carries out carbon dioxide explosion.The inventive method can be reduced investment outlay, separately need not be gone into operation skill lane and increase crossheading section etc., and the carbon dioxide of quickly release can be avoided causing gas accident because blowing out generation naked light in carbon dioxide fracturing device blasting process, safety is higher, can be prevented effectively from highly gassy mine, top coal explosion is easily caused by gas explosion, and the top cleat in coal after explosion is grown, and effect is directly effective
After the present invention adopts carbon dioxide explosion that top hard coal is weakened, top coals' recovery ratio is than improve 20%~30% before top board fracturing, and fracturing effect is obvious, achieves significant economic benefit.Through field observation and statistics it can be seen that after carbon dioxide explosion coal body be block structure relatively uniform, that Relative Size is less, putting coal cinder in coal process is prose style free from parallelism flow regime, puts coal smooth, has no coal cinder or spoil closure coal discharge outlet.
Accompanying drawing explanation
Fig. 1 is the present invention schematic diagram based on the method weakening hard coal seam Sub-Level Caving of carbon dioxide explosion;
Fig. 2 is the Section A-A figure of Fig. 1;
Wherein: 1: stope drift active workings;2: hydraulic support;3: goaf;4: entity coal;5: boring;6: roof;7: top coal;8: blasting crack district.
Detailed description of the invention
The embodiment of the present invention illustrates for colliery, Xinjiang.
Embodiment
The method weakening hard coal seam Sub-Level Caving based on carbon dioxide explosion of the present embodiment, coal seam thickness is 12m, adopts comprehensive mechanization Sub-Level Caving method to exploit, mining height 3m, caving coal height 7m.As shown in Figure 1 and Figure 2, carry out according to following steps:
(1) in carrying out coal seam exploitation process, near the top board place of rib between hydraulic support 2 back timber, arrange the boring 5 penetrating top coal 7 coal body arrival roof 6 at interval of 5 hydraulic supports, boring 5 and roof 6 are in certain inclination alpha 45o, and the length L of boring 5 is 10m;
(2) carbon dioxide fracturing device is placed in boring 5, it is inserted at the bottom of hole, adopt bag type paste or rubber hole packer sealing of hole, sealed borehole length is 1.5m, and setting only flies device and connects wire, uses exploder to start heater, it is sequentially carried out carbon dioxide explosion according to boring order, finally making top hard coal 7 produce crack, blasting crack district 8 as shown in Figure 2, intensity is weakened.
Wherein, described boring 5 diameter is 65mm, and the distance between adjacent two borings is 10m.
Described boring 5 and roof 6 are 45 ° in certain inclination alpha.
The described back production along with work surface implements carbon dioxide explosion at interval of certain distance at top coal, and namely explosion circulation step pitch is 7m.
Described use exploder starts heater, making the liquid carbon dioxide within heating carbon dioxide fracturing device become gas, in carbon dioxide fracturing device, pressure continues to increase compressing 200MPa level pressure and shears sheet so that it is in level pressure to shear sheet disrumpent feelings, release gases at high pressure, fracturing coal body.
Pushing up cleat in coal after explosion to grow, coal body is block structure relatively uniform, that Relative Size is less, and putting coal cinder in coal process is prose style free from parallelism flow regime, puts coal smooth, has no coal cinder or spoil closure coal discharge outlet greatly facilitates follow-up exploitation.

Claims (5)

1. the method weakening hard coal seam Sub-Level Caving based on carbon dioxide explosion, it is characterised in that carry out according to following steps:
(1) in carrying out coal seam exploitation process, near the top board place of rib between two hydraulic support top beams, arranging the boring penetrating top coal coal body arrival roof at interval of 5~8 hydraulic supports, boring and roof are certain inclination alpha, and the length of boring is L;
(2) carbon dioxide fracturing device is placed in boring, it is inserted at the bottom of hole, adopt bag type paste or rubber hole packer sealing of hole, sealed borehole length is (0.1~0.2) L, and and arrange and only fly device, connect wire, exploder is used to start heater, it is sequentially carried out carbon dioxide explosion according to boring order, finally makes top hard coal produce crack, weakening strength.
2. a kind of method weakening hard coal seam Sub-Level Caving based on carbon dioxide explosion according to claim 1, it is characterised in that described bore diameter is 60mm~80mm, and the distance between adjacent two borings is 8m ~ 10m.
3. a kind of method weakening hard coal seam Sub-Level Caving based on carbon dioxide explosion according to claim 1, it is characterised in that described boring and roof are certain inclination alpha is 30 ° ~ 60 °.
4. a kind of method weakening hard coal seam Sub-Level Caving based on carbon dioxide explosion according to claim 1, it is characterised in that along with the back production of work surface implements carbon dioxide explosion at interval of certain distance at top coal, i.e. explosion circulation step pitch≤L × cos α.
5. a kind of method weakening hard coal seam Sub-Level Caving based on carbon dioxide explosion according to claim 1, it is characterized in that described use exploder starts heater, the liquid carbon dioxide within heating carbon dioxide fracturing device is made to become gas, in carbon dioxide fracturing device, pressure continues to increase compressing 200MPa level pressure shearing sheet, level pressure therein is made to shear sheet disrumpent feelings, release gases at high pressure, fracturing coal body.
CN201610263144.5A 2016-04-26 2016-04-26 A kind of method of the reduction hard coal seam Sub-Level Caving based on carbon dioxide explosion Active CN105804753B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106288988A (en) * 2016-08-31 2017-01-04 北京龙德时代技术服务有限公司 Intelligence carbon dioxide blasting technology method
CN107044284A (en) * 2017-02-23 2017-08-15 四川川交路桥有限责任公司 A kind of mountain tunnel mechanized construction method based on high-pressure carbon dioxide fracturing
CN107975373A (en) * 2018-01-16 2018-05-01 中南大学 A kind of lower continuous digging hard-rock mine method of mechanization of liquid-gas phase transition induction
CN112127888A (en) * 2020-09-27 2020-12-25 山西鑫桥科技有限公司 Method for treating top coal, direct roof and old roof
CN113090264A (en) * 2021-04-27 2021-07-09 河南理工大学 Horizontal deep borehole CO for hard coal seam and hard rock stratum2Fracturing safety roof control method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102852506A (en) * 2012-10-17 2013-01-02 中国矿业大学 High-pressure pneumatic blasting pressure relieving and transmission increasing method
CN103334790A (en) * 2013-07-23 2013-10-02 辽宁工程技术大学 High-pressure gas blasting-based coal seam roof advance presplitting method
CN203685187U (en) * 2013-10-17 2014-07-02 湖南汉寿中煤科技有限公司 Oriented CO2 air cannon device
CN103953342A (en) * 2014-04-11 2014-07-30 山东山矿测控技术有限公司 Improved carbon dioxide explosion initiating device used for coal mine, and assembly method thereof
CN104500019A (en) * 2014-11-18 2015-04-08 辽宁工程技术大学 Reinforced anti-reflection method for promoting gas extraction
CN204678995U (en) * 2015-05-31 2015-09-30 西安科技大学 The advanced pre-quick-fried big gun pore structure of severe inclined thick coal seam exploitation top coal

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102852506A (en) * 2012-10-17 2013-01-02 中国矿业大学 High-pressure pneumatic blasting pressure relieving and transmission increasing method
CN103334790A (en) * 2013-07-23 2013-10-02 辽宁工程技术大学 High-pressure gas blasting-based coal seam roof advance presplitting method
CN203685187U (en) * 2013-10-17 2014-07-02 湖南汉寿中煤科技有限公司 Oriented CO2 air cannon device
CN103953342A (en) * 2014-04-11 2014-07-30 山东山矿测控技术有限公司 Improved carbon dioxide explosion initiating device used for coal mine, and assembly method thereof
CN104500019A (en) * 2014-11-18 2015-04-08 辽宁工程技术大学 Reinforced anti-reflection method for promoting gas extraction
CN204678995U (en) * 2015-05-31 2015-09-30 西安科技大学 The advanced pre-quick-fried big gun pore structure of severe inclined thick coal seam exploitation top coal

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106288988A (en) * 2016-08-31 2017-01-04 北京龙德时代技术服务有限公司 Intelligence carbon dioxide blasting technology method
CN107044284A (en) * 2017-02-23 2017-08-15 四川川交路桥有限责任公司 A kind of mountain tunnel mechanized construction method based on high-pressure carbon dioxide fracturing
CN107975373A (en) * 2018-01-16 2018-05-01 中南大学 A kind of lower continuous digging hard-rock mine method of mechanization of liquid-gas phase transition induction
CN112127888A (en) * 2020-09-27 2020-12-25 山西鑫桥科技有限公司 Method for treating top coal, direct roof and old roof
CN113090264A (en) * 2021-04-27 2021-07-09 河南理工大学 Horizontal deep borehole CO for hard coal seam and hard rock stratum2Fracturing safety roof control method

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