CN109869182A - Coal mine gas drainage method - Google Patents
Coal mine gas drainage method Download PDFInfo
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- CN109869182A CN109869182A CN201910159897.5A CN201910159897A CN109869182A CN 109869182 A CN109869182 A CN 109869182A CN 201910159897 A CN201910159897 A CN 201910159897A CN 109869182 A CN109869182 A CN 109869182A
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Abstract
The invention discloses a kind of coal mine gas drainage methods, it includes the following steps: gas source being divided into height, low concentration gas source, gas density >=25% in high concentration gas source, gas density < 25% in low concentration gas source, extraction is carried out to high concentration gas source using high concentration extraction system, as gas density < 25%, extraction parameter is adjusted to improve gas density, when gas density >=25% cannot be improved, extraction is carried out by low concentration extraction system, extraction is carried out with the high concentration gas source for being unsatisfactory for high concentration extraction condition to low concentration gas source using low concentration extraction system, start blowing system dilution gas density < 3% simultaneously.Its purpose is to provide a kind of coal mine gas drainage method, it is using gas density as center control parameter, traditional high negative pressure, lower negative pressure extraction system are replaced using high concentration extraction system and low concentration extraction system, it avoids mash gas extraction concentration from being in explosion section, realizes the essential safety of coal mine gas drainage.
Description
Technical field
The present invention relates to coal mine fields, more particularly to a kind of method for extraction coal mine gas.
Background technique
Currently, the more serious situation of China's coal-mine Gas Disaster accident fails to change always, and major gas accident is shown in repeatly
It is not fresh, and wideling popularize extraction coal-bed gas is to reduce the burden of mine ventilation dilution gas and make up a deficiency, and prevents great watt
The effective measures and method of this accident；In addition, mine gas is also a kind of resource, the gas of extraction be can use, it is made " to become evil
For treasured ", and reduce the pollution to atmospheric environment.
As shown in Figure 1, gas is a kind of gas with firing property, can set off an explosion after gas chance fire in air dense
Spending range is 5%~16%；When gas density is 9.5%, brisance maximum (oxygen and gas react completely)；Gas is dense
Degree loses its explosivity at 16% or more, but chance fire can still burn in air.
The characteristics of according to gas explosion, to guarantee safety, gas extraction concentration must not be in explosion section, countries in the world
Gas drainage under suction regulation draws out methane concentration must not be lower than 25%, but in China, and 60% or more gas drainage under suction concentration is lower than 25%,
Phenomenon of this concentration of extraction pipeline Neva in explosion section is generally existing, although the water-ring vacuum pump to draw out methane can guarantee
Spark is not generated in the pump housing, but the presence of explosive methane gas seriously threatens the safety of mine in pipeline.Realize essential safety
Unique channel be exactly control gas extraction concentration, avoid gas density blast area.
China underground condition that draws out methane is more complicated, firstly, from different places according to extraction, needing to carry out watt of protolith band
The goaf mash gas extraction of this pre- pumping and release drainage；Secondly, it is different according to the purpose for administering gas, it needs to carry out mash gas outburst prevention pumping
Put and reduce gas emission extraction；Again, same extraction area extraction drilling due to adopt face distance change influence, also not
It is disconnected to vary.It is complicated and changeable due to extraction condition, it is not easy to reach effect again using the neither good management of same circuits, to guarantee
The needs of Safety of Coal Mine Production improve gas drainage results, and China's coal-mine gas drainage system, which is often built, two sets or more set extraction systems
System, such as high negative pressure system and lower negative pressure system, high negative pressure system is used to this coal bed drilling gas of extraction protolith band and wears layer brill
Hole gas, lower negative pressure system are used to extraction coal working face upper corner pipe laying gas, High Position Drilling goaf gas and carry out lane
Gas pumping；But requirement of the extraction condition of each system to negative pressure is widely different, to high negative pressure gas drainage under suction, since coal (rock) layer covers
Depositing influences between situation and the difference and gas drainage and seam mining of gas bearing situation, and the requirement to negative pressure is also different
Sample, as Gas pre-drainage and inhaling as tunneling (or Mining and pumping) require extraction differing pressure larger；For lower negative pressure gas drainage under suction, no
Gas drainage under suction negative pressure difference with place such as upper corner and the lane Ding Chou (lane Di Chou) is also larger, in the application of practical coal mine, two sets
Negative pressure required for system is very unstable, not stringent negative pressure boundary；The construction of both systems is mainly based upon reduction watt
This is gushed out the demand influenced on Safety of Coal Mine Production and determines, without considering a problem from the security standpoint of gas drainage system,
Index-gas density not most important to extraction is bound, in two kinds of systems generally existing gas density explosion section
Extraction situation, methane gas of the concentration in explosive range may be full of in drainage system pipeline；Full of explosive gas
Gas tube system is the major hazard source for threatening safety of coal mines, and piping gas explosion thing occurs for China and other countries
Therefore.In addition, so voltage divider system extraction is also unfavorable for improving gas drainage under suction concentration, gas drainage results are reduced.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of coal mine gas drainage methods, are controlled centered on gas density
Parameter processed replaces traditional high negative pressure, lower negative pressure extraction system using high concentration extraction system and low concentration extraction system, avoids
Mash gas extraction concentration is in explosion section, realizes the essential safety of coal mine gas drainage.
Coal mine gas drainage method of the present invention, includes the following steps:
Gas source is analyzed, gas source is divided into high concentration gas source and low concentration gas source, the gas density in the high concentration gas source
>=25%, the gas density < 25% in the low concentration gas source,
Extraction operation is carried out to high concentration gas source using high concentration extraction system, the high concentrations of gas that extraction is arrived carries out comprehensive
It closes and utilizes, and pass through the gas density of automatic detection and control system real-time detection high concentration gas source, as gas density < 25%,
The extraction parameter of high concentration extraction system is adjusted to improve gas density, when cannot improve by the automatic detection and control system
When gas density >=25%, extraction operation is carried out to high concentration gas source by low concentration extraction system,
Using low concentration extraction system to low concentration gas source and be not able to satisfy the high concentration gas source of high concentration extraction condition into
Row extraction operation, while starting blowing system dilution gas density, make gas density < 3%, the light concentration gas that extraction is arrived
Carry out emptying or purified treatment.
Coal mine gas drainage method of the present invention, wherein described carry out extraction to high concentration gas source using high concentration extraction system
Gas density >=30% when operation, in high concentration gas source.
Coal mine gas drainage method of the present invention, wherein the automatic detection and control system includes pipeline gas on-line checking system
System and draw-off pump station Intelligence Feedback regulating system.
Coal mine gas drainage method of the present invention, wherein the pipeline gas on-line detecting system detects gas density, oxygen
Concentration, carbonomonoxide concentration, gas temperature, gas flow rate and gas flow.
Coal mine gas drainage method of the present invention, wherein the draw-off pump station Intelligence Feedback regulating system is by adjusting extraction area
The folding of control valve and extraction pump operating status adjust pipeline flow and negative pressure to achieve the purpose that control gas concentration.
Coal mine gas drainage method of the present invention, wherein described carry out extraction to high concentration gas source using high concentration extraction system
When operation, the extraction amount and gas emission of the high concentration extraction system are adapted.
Coal mine gas drainage method of the present invention is negative instead of traditional height with high concentration extraction system and low concentration extraction system
Pressure, lower negative pressure extraction system, avoid mash gas extraction concentration from being in the explosion section of 5%-16%.Its middle and high concentration extraction system master
It wants extraction to have the region of highly concentrated gas gas source, guarantees that gas extraction concentration is greater than 25%, meet the mark of international gas extraction concentration
Standard extracts gas out for comprehensive utilization, turns waste into wealth, while reducing greenhouse gas emission.Low concentration extraction system is mainly used for
Extraction mine ventilation system gas is easy to gather region and cannot achieve the region of highly concentrated extraction, such as stope upper corner watt
This, extraction concentration not more than 3% solves the problems, such as return gas exceeding limit.This ensures that methane gas extraction pipeline system
With the essential safety of extraction pumping plant.
The present invention will be further explained below with reference to the attached drawings.
Detailed description of the invention
Fig. 1 is that methane mixes with air object explosion limit figure；
Fig. 2 is the extraction curve synoptic diagram of the gas emission and high concentration extraction system in the present invention；
Fig. 3 is the flow chart of coal mine gas drainage method of the present invention.
Specific embodiment
As shown in figure 3, coal mine gas drainage method of the present invention includes the following steps:
Gas source is analyzed, gas source is divided into high concentration gas source and low concentration gas source, the gas density in the high concentration gas source
>=25%, the gas density < 25% in the low concentration gas source,
Extraction operation is carried out to high concentration gas source using high concentration extraction system, the high concentrations of gas that extraction is arrived carries out comprehensive
It closes and utilizes, and pass through the gas density of automatic detection and control system real-time detection high concentration gas source, as gas density < 25%,
The extraction parameter of high concentration extraction system is adjusted to improve gas density, when cannot improve by the automatic detection and control system
When gas density >=25%, extraction operation is carried out to high concentration gas source by low concentration extraction system,
Using low concentration extraction system to low concentration gas source and be not able to satisfy the high concentration gas source of high concentration extraction condition into
Row extraction operation, while starting blowing system dilution gas density, make gas density < 3%, the light concentration gas that extraction is arrived
Carry out emptying or purified treatment.
Coal mine gas drainage method of the present invention, wherein described carry out extraction to high concentration gas source using high concentration extraction system
Gas density >=30% when operation, in high concentration gas source.
Coal mine gas drainage method of the present invention, wherein the automatic detection and control system includes pipeline gas on-line checking system
System and draw-off pump station Intelligence Feedback regulating system.
Coal mine gas drainage method of the present invention, wherein the pipeline gas on-line detecting system detects gas density, oxygen
Concentration, carbonomonoxide concentration, gas temperature, gas flow rate and gas flow.
Coal mine gas drainage method of the present invention, wherein the draw-off pump station Intelligence Feedback regulating system is by adjusting extraction area
The folding of control valve and extraction pump operating status adjust pipeline flow and negative pressure to achieve the purpose that control gas concentration.
As shown in Fig. 2, coal mine gas drainage method of the present invention, wherein described use high concentration extraction system to high concentration gas
When source carries out extraction operation, the extraction amount and gas emission of the high concentration extraction system are adapted.
The present invention needs to use four systems during specific implementation, specifically:
First systematic is the automatic detection and control system of gas drainage system, which includes pipeline gas on-line checking
System, draw-off pump station Intelligence Feedback regulating system；Pipeline gas detection system include methane gas (CH4) concentration inside pipeline,
Oxygen (O2) concentration, carbon monoxide (CO), gas temperature, gas flow rate, flow etc.；By adjusting each extraction area control valve
Folding and extraction pump operating status adjust pipeline flow and negative pressure to reach the purpose of controlled concentration.
Second system is the intelligent extraction equipment of high concentration extraction system, which can adaptive Gas rule
Rule, according to the different adjustment operating parameter in gas drainage stage；
With the time different coal drilling in gas amount of precipitation be also it is continually changing, ideal extraction way be with
Gas (CH4) amount of precipitation variation, extraction parameter (drilling negative pressure, flow) will also change with adjustment, and the operation of pumping plant is bent
Line is also that curve is precipitated close to gas, accomplishes the intelligent extraction of gas.
As shown in Fig. 2, extraction pumping plant under the control of intelligence software, can make pumping station operation (negative pressure, flow) parameter
Close to Gas curve, the gas for being pumped into pipeline is substantially gas (CH4), it is dense to improve pipeline gas for mixed little air
Degree；The fixation negative pressure extraction for avoiding current extraction way is pumped into air when deficiency is precipitated in gas from coal wall and pipe joint
Compensation reduces mash gas extraction concentration.
Third system is low concentration extraction system, the pipeline air distribution intelligent control of underground coal mine pipe-line system initial end
System, the control system include Intelligence Feedback control system, with air valve etc.；For that can not be improved watt by intelligent extraction pumping plant
In the case where this concentration to target value, it is dense by the way of underground coal mine pipe end valve opening and closing air distribution (air) to reduce pipeline
It spends to 3% or less.
Four systems are gas drainage pipeline and extraction pumping plant safety system, which includes quick-make valve
Door, fire arrester, three proofings device etc. are mounted on the positions such as pumping plant front and back, down-hole pipe branch and end, form multiple safety protection
Guarantee system safety.
The above intelligentized software and hardware cooperation, can be with dynamically adapting control gas extraction technique, it is established that coal mine fining
Gas drainage engineering is control target with gas density, it is established that coal mine gas high concentration extraction system and low concentration extraction system
System guarantees gas extraction concentration or is greater than 25% or lower than 3%, gas tube concentration is avoided to run in explosion section.
Coal mine gas drainage method of the present invention is negative instead of traditional height with high concentration extraction system and low concentration extraction system
Pressure, lower negative pressure extraction system, avoid mash gas extraction concentration from being in the explosion section of 5%-16%.Its middle and high concentration extraction system master
It wants extraction to have the region of highly concentrated gas gas source, guarantees that gas extraction concentration is greater than 25%, meet the mark of international gas extraction concentration
Standard extracts gas out for comprehensive utilization, turns waste into wealth, while reducing greenhouse gas emission.Low concentration extraction system is mainly used for
Extraction mine ventilation system gas is easy to gather region and cannot achieve the region of highly concentrated extraction, such as stope upper corner watt
This, extraction concentration not more than 3% solves the problems, such as return gas exceeding limit.This ensures that methane gas extraction pipeline system
With the essential safety of extraction pumping plant.
Embodiment described above only describe the preferred embodiments of the invention, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical side of the invention
The various changes and improvements that case is made should all be fallen into the protection scope that claims of the present invention determines.
Claims (6)
1. a kind of coal mine gas drainage method, which comprises the steps of:
Gas source is analyzed, gas source is divided into high concentration gas source and low concentration gas source, the gas density in the high concentration gas source >=
25%, the gas density < 25% in the low concentration gas source,
Extraction operation is carried out to high concentration gas source using high concentration extraction system, by extraction to high concentrations of gas carry out comprehensive benefit
With, and passed through by the gas density of automatic detection and control system real-time detection high concentration gas source as gas density < 25%
The automatic detection and control system adjusts the extraction parameter of high concentration extraction system to improve gas density, when cannot improve gas
When concentration >=25%, extraction operation is carried out to high concentration gas source by low concentration extraction system,
It is not able to satisfy to low concentration gas source and the high concentration gas source of high concentration extraction condition using low concentration extraction system and takes out
Operation is adopted, while starting blowing system dilution gas density, makes gas density < 3%, the light concentration gas that extraction is arrived carries out
Emptying or purified treatment.
2. coal mine gas drainage method according to claim 1, it is characterised in that: described to use high concentration extraction system pair
Gas density >=30% when high concentration gas source carries out extraction operation, in high concentration gas source.
3. coal mine gas drainage method according to claim 2, it is characterised in that: the automatic detection and control system includes
Pipeline gas on-line detecting system and draw-off pump station Intelligence Feedback regulating system.
4. coal mine gas drainage method according to claim 3, it is characterised in that: the pipeline gas on-line detecting system
Detect gas density, oxygen concentration, carbonomonoxide concentration, gas temperature, gas flow rate and gas flow.
5. coal mine gas drainage method according to claim 4, it is characterised in that: the draw-off pump station Intelligence Feedback is adjusted
System adjusts pipeline flow and negative pressure by adjusting folding and the extraction pump operating status of extraction area control valve to reach control
The purpose of gas density processed.
6. coal mine gas drainage method according to claim 5, it is characterised in that: described to use high concentration extraction system pair
When high concentration gas source carries out extraction operation, the extraction amount and gas emission of the high concentration extraction system are adapted.
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Cited By (6)
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| CN110374667A (en) * | 2019-08-26 | 2019-10-25 | 贵州大学 | A kind of methane drawing device for coal mine |
| CN110578550A (en) * | 2019-10-15 | 2019-12-17 | 中国矿业大学 | Intelligent auxiliary power device for improving gas extraction concentration and working method |
| CN111577282A (en) * | 2020-05-26 | 2020-08-25 | 内蒙古福城矿业有限公司 | High-low negative pressure separate source coal mine gas drainage process |
| CN113513361A (en) * | 2021-08-10 | 2021-10-19 | 北京大学 | Method and system for regulating and controlling gas concentration of stope face of high-gas coal mine |
| CN116771413A (en) * | 2023-06-28 | 2023-09-19 | 安徽理工大学 | Safety management system for intelligent extraction of underground coal mine gas |
| CN116816424A (en) * | 2023-06-28 | 2023-09-29 | 安徽理工大学 | Intelligent monitoring system of mine gas extraction pipeline |
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| CN113513361B (en) * | 2021-08-10 | 2022-04-29 | 北京大学 | Method and system for regulating and controlling gas concentration of stope face of high-gas coal mine |
| CN116771413A (en) * | 2023-06-28 | 2023-09-19 | 安徽理工大学 | Safety management system for intelligent extraction of underground coal mine gas |
| CN116816424A (en) * | 2023-06-28 | 2023-09-29 | 安徽理工大学 | Intelligent monitoring system of mine gas extraction pipeline |
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Application publication date: 20190611 |