CN106089177A - A kind of high-efficiency coal underground gasification furnace and construction method thereof - Google Patents
A kind of high-efficiency coal underground gasification furnace and construction method thereof Download PDFInfo
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- CN106089177A CN106089177A CN201610682180.5A CN201610682180A CN106089177A CN 106089177 A CN106089177 A CN 106089177A CN 201610682180 A CN201610682180 A CN 201610682180A CN 106089177 A CN106089177 A CN 106089177A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
Abstract
The invention discloses a kind of high-efficiency coal underground gasification furnace and construction method thereof, be included in ignition channel, channel of gas collection, inlet channel and outlet passageway that a tetragon coal seam block is arranged, outlet passageway in the horizontal range of block edge, tetragon coal seam and channel of gas collection at more than 10m；Use the cross section retreating combustion method extension channel of gas collection to 2 × 2m2Above, a plurality of inlet channel kept at a certain distance away connects in downside with the channel of gas collection after extension, it is achieved gas collection；When the flame range work surface in channel of gas collection backs near certain venthole, then split and the infiltration burning of reverse firepower in this pore pressure, link up outlet passageway and channel of gas collection；The present invention can realize multiple inlet channel parallel connection gasification, improves gasification furnace production capacity；Use and retreat burning and the most through method, shorten gasification furnace construction schedule；The system of giving vent to anger being made up of vertical drilling is arranged in beyond area of stress concentration, improves the stability of the system of giving vent to anger.
Description
Technical field
The present invention relates to underground coal gasification(UCG) production technique, particularly to a kind of high-efficiency coal underground gasification furnace and structure thereof
Method, it is adaptable to the coal seam of different existence state carries out gasified exploitation efficiently.
Background technology
The underground coal gasification(UCG) of formula without well is to carry out, by the boring of construction geology in original subterranean coal, the process that gasifies.
The primitive coalbed occurrence status of zones of different is different, and the underground gasification furnace of existing single form is nothing in angle economically and reasonably
Method reaches effective covering of coal resources；In gasification tunnel, coal gas after direct gasification, containing ash, high temperature, high pressure, can cause simultaneously
Go out gas drilling hole blocking, deformation；Additionally conventional underground gasification furnace can form the biggest burned out area at foot of hole of vertically giving vent to anger, and causes
Foot of hole stress is concentrated, and affects borehole stability and gives vent to anger.
Summary of the invention
The purpose of the present invention is to propose to a kind of high-efficiency coal underground gasification furnace and construction method thereof, make full use of coal seam orientation
Drilling process underground gasification furnace and the channel of gas collection of integration construct, system of giving vent to anger simultaneously.The coal seam of scale of depositing is composed for difference
Gasification tunnel bar number and channel of gas collection length are adjusted flexibly, utilize channel of gas collection that coal gas carries out dedusting, cooling, voltage stabilizing and all
Weighing apparatus gas composition, vertically goes out gas drilling hole and is positioned at outside region of stress concentration, it is possible to realize the large area to coal seam, ensured sustained development, height
Usefulness gasifies.
To achieve these goals, the technical scheme is that
A kind of high-efficiency coal underground gasification furnace, is included in the ignition channel of a tetragon coal seam block setting, channel of gas collection, air inlet
Passage and outlet passageway, wherein, described ignition channel is a drilled tunnel vertically downward, and ignition channel is arranged on tetragon
One corner areas of coal seam block, described drilled tunnel stretches into coal seam away from seat earth 0.5 to 2m, is provided with at least around ignition channel
Two auxiliary firing passages, two auxiliary firing passages are triangular pattern with ignition channel in corner areas, and ignition channel leads to
Cross ignition channel gap locating away from seat earth 0.5 to 2m at bottom and two auxiliary firing channel connections, described channel of gas collection
Connect with ignition channel, and extend horizontally to another corner areas that tetragon coal seam block is adjacent with ignition channel corner areas
Then up to ground；Described outlet passageway be multiple from ground passage vertically downward, multiple outlet passageways are arranged as a row
Be arrangeding in parallel with channel of gas collection, the ducts for effluent air horizontal range at block edge, tetragon coal seam with channel of gas collection is more than 10m；
Described inlet channel quantity less than ducts for effluent air quantity away from seat earth 0.50 to 2 meters through on the downside of channel of gas collection with give vent to anger
Channel spacing connects；Described inlet channel is perpendicular to channel of gas collection and is parallel to each other through tetragon coal seam block at tetragon coal seam block
Being upwardly into ground relative to the another side edge at outlet passageway edge, the described outlet passageway connected with inlet channel is logical by giving vent to anger
Gap, road connects with channel of gas collection in bottom, and the described and disconnected outlet passageway of inlet channel passes through outlet passageway gap the end of at
Holding and the connection of adjacent outlet passageway, adjacent outlet passageway is the outlet passageway connected with inlet channel.
Scheme is further: said two auxiliary firing passage is arranged on channel of gas collection both sides.
Scheme is further: the distance between described outlet passageway is more than 20m.
Scheme is further: described ignition channel gap is to realize by the way of cold conditions pressure break, described in give vent to anger logical
Gap, road is after firing by permeating burning realization at outlet passageway input air pressure and reverse firepower.
Scheme is further: described ignition channel, described outlet passageway, channel of gas collection are perpendicular to ground segment, inlet channel
It is perpendicular to ground segment and is respectively provided with casing cementing.
Scheme is further: described channel of gas collection is perpendicular between ground segment and horizontal segment and inlet channel is perpendicular to ground
Section be to be connected by oblique section respectively between horizontal segment, described oblique section employing standard oil casing cementing, under described horizontal segment
Put a pillar with intensity.
A kind of high-efficiency coal underground gasification furnace construction method, is to arrange ignition channel, gas collection at a tetragon coal seam block
The method of passage, inlet channel and outlet passageway, outlet passageway is perpendicular to the passage on ground, wherein: ignition channel is on four limits
One corner areas of shape coal seam block, inlet channel import and outlet passageway outlet respectively a row, each row are multiple, and one discharges into
Gas channel entrance and ducts for effluent air outlet are separately positioned on two relative edges of tetragon coal seam block, described channel of gas collection
Being one, a channel of gas collection is arranged on block outlet passageway side, tetragon coal seam and connects with ignition channel, and its method is: described
Channel of gas collection uses the mode of directional drilling to bore from tetragon coal seam another corner areas of block adjacent with ignition channel, first
The most vertical lower brill, changes into boring obliquely after entering coal seam, is drilled into obliquely and changes horizontal cross into behind seat earth 0.5 to 2m place
Creep into until connecting with ignition channel；Its horizontal cross Duan Yuyi ducts for effluent air is parallel, away from a ducts for effluent air horizontal range
More than 10m, and, after ignition channel is lighted a fire, apply air pressure from outlet passageway form the gap that the infiltration burning of reverse firepower produces
Channel of gas collection is made to connect with outlet passageway；Described inlet channel use directional drilling mode, from tetragon coal seam block
Discharge into and bore under the tetragon coal seam block another side that gas channel entrance is relative, first vertical lower brill, change into obliquely after entering coal seam
Boring, after seat earth 0.50 to 2 meters, changing horizontal drilling into, until connecting with outlet passageway.
Scheme is further: described inlet channel quantity is less than exhaust passage quantity, and inlet channel is away from seat earth
0.50 to 2 meters connect through on the downside of channel of gas collection and outlet passageway interval.
Scheme is further: described method farther includes: uses after ignition channel is lighted a fire and retreats burning extension gas collection
The cross section of passage is to 2 × 2m2Above, described inlet channel with extension after channel of gas collection in downside UNICOM.
Scheme is further: described apply air pressure from outlet passageway and forms the gap that the infiltration burning of reverse firepower produces and make collection
The method that gas passage connects with outlet passageway is: after gasification furnace is lighted a fire, when the flame range work surface in channel of gas collection backs to connect
During a nearly outlet passageway, closing gradually gas transmission pressurization to the outlet of this outlet passageway, preset pressure pause point, at each pressure
Pause point, within the time set, monitoring is given vent to anger the change of passway pause point pressure, presses when outlet passageway mouth pauses
Power bust, then channel of gas collection has produced with outlet passageway and has connected.
The invention has the beneficial effects as follows:
1, improve the utilization rate of coal resources: the occurrence characteristics for different coal resources builds underground gasification furnace, adjusts flexibly
Whole gasification tunnel and the length of channel of gas collection, it is achieved gasification resource utilization more than 80%, substantially increase the utilization of coal resources
Rate.
2, improve the comprehensive quality of product coal gas: first the product coal gas in each bar gasification tunnel is converged at gas collection and leads to
In road, utilize channel of gas collection to buffer, reach certain dedusting, cooling, voltage stabilizing and equilibrium gas composition effect, improve
The comprehensive quality of direct products coal gas.
3, improve the stability of the system of giving vent to anger: the system of giving vent to anger being made up of vertical drilling be arranged in area of stress concentration with
Outward, it is to avoid behind formation dead zone, underground, the stratum changing of the relative positions is to the shear action bottom venthole, going out of the certain length concurrently formed
Air pipe can reduce gas temperature and the effect of high-temperature retorting both sides coal resources, it is ensured that foot of hole of giving vent to anger is in stable
Crustal stress states under, do not affected by excessive temperature, fundamentally solve the instability of gasification furnace and give vent to anger problem, improve
The stability of system of giving vent to anger.
4, improve gasification furnace production capacity: by multiple inlet channels (work surface) gasification the most in parallel, the quantity of inlet channel
Can determine according to coal seam conditions and production scale, improve single stove production capacity.
5, gasification furnace construction schedule is shortened: when the flame range work surface in channel of gas collection backs near certain venthole
Time, then split and the infiltration burning of reverse firepower in this pore pressure, link up outlet passageway and channel of gas collection；Use and retreat burning and inversely pass through
Logical method, shortens gasification furnace construction schedule.
With embodiment, invention is described in detail below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is gasified furnace structure schematic diagram.
Detailed description of the invention
Embodiment 1:
A kind of high-efficiency coal underground gasification furnace, as it is shown in figure 1, be included in ignition channel I1 that a tetragon coal seam block 1 arranges,
Channel of gas collection D4, inlet channel D1, D2, D3 and outlet passageway P1, P2, P3, P4, P5, wherein, described ignition channel is one and hangs down
The most downward drilled tunnel, ignition channel is arranged on one corner areas of tetragon coal seam block, and described drilled tunnel stretches into coal seam
Away from seat earth 101 about 0.5 to 2m, it is provided with at least two auxiliary firing passage I2, I3 around ignition channel 5 meters to 10 meters, two
Individual auxiliary firing passage and ignition channel are triangular pattern in corner areas, and ignition channel passes through ignition channel gap in bottom
With two auxiliary firing channel connections, described channel of gas collection is connecting with ignition channel away from seat earth 0.5 to 2m place, and level
Extend to tetragon coal seam block another corner areas adjacent with ignition channel corner areas then up to ground, horizontal segment
According to outlet passageway, length can arrange that number adjusts or does reserved；Described outlet passageway be multiple from ground vertically downward logical
Road, is drilled into seat earth, and bottom reaming also applies supporting, aperture according to gas production it needs to be determined that, hole number
Adjustable；Multiple outlet passageways are arranged as a row and be arranged in parallel with channel of gas collection, are generally being perpendicular to up to entering of channel of gas collection
Gas passage area is referred to as area of stress concentration, and the past is the most all that outlet passageway is arranged on this region, the most often goes out to reveal
Gas passage occurs the problem of blocking during running, and in the present embodiment, a described ducts for effluent air is in tetragon coal seam
Block edge is more than 10m, (such as 15m) with the horizontal range of channel of gas collection, is arranged in outside area of stress concentration；Such as Fig. 1 institute
Show, described inlet channel quantity less than ducts for effluent air quantity away from seat earth 0.50 to 2 meters through on the downside of channel of gas collection with
Outlet passageway interval connection, it may be assumed that P1, P3, P5 connect with D1, D2, D3 respectively；Described inlet channel horizontal vertical is in channel of gas collection
It is parallel to each other and is upwardly into ground at tetragon coal seam block relative to the another side edge at outlet passageway edge through tetragon coal seam block,
The described outlet passageway connected with inlet channel is connected with channel of gas collection in bottom by outlet passageway gap, described logical with air inlet
The disconnected outlet passageway in road is connected with adjacent outlet passageway in bottom by outlet passageway gap, and adjacent outlet passageway is
The outlet passageway connected with inlet channel.
In embodiment: said two auxiliary firing passage is arranged on channel of gas collection both sides.
In embodiment: the distance between described outlet passageway is more than 20m, and the present embodiment is between 20m to 30m.
In embodiment: described ignition channel gap is to realize by the way of cold conditions pressure break, described outlet passageway stitches
Gap is after firing by permeating burning realization at outlet passageway input air pressure and reverse firepower.
In embodiment: it is vertical that described ignition channel, described outlet passageway, channel of gas collection are perpendicular to ground segment, inlet channel
It is respectively provided with casing cementing in ground segment.Described channel of gas collection is perpendicular between ground segment and horizontal segment and inlet channel is perpendicular to
Being to be connected by oblique section respectively between ground segment with horizontal segment, described oblique section uses standard oil casing cementing, described level
Section transfers a pillar with intensity.Having reaming bottom ignition channel and outlet passageway, bottom reaming applies supporting.
Embodiment 2:
A kind of based on the construction method of high-efficiency coal underground gasification furnace described in embodiment 1, it is to arrange at a tetragon coal seam block
The method of ignition channel, channel of gas collection, inlet channel and outlet passageway, the content in embodiment 1 is applicable to this city embodiment, because of
This, outlet passageway is perpendicular to the passage on ground, wherein: ignition channel leads in one corner areas of tetragon coal seam block, air inlet
It is multiple that road import and outlet passageway outlet are respectively a row, each row, and one discharges into gas channel entrance and a ducts for effluent air goes out
Mouth is separately positioned on two relative edges of tetragon coal seam block, and described channel of gas collection is one, and a channel of gas collection is arranged on
Block outlet passageway side, tetragon coal seam connects with ignition channel, wherein, described channel of gas collection use directional drilling mode from
Bore under tetragon coal seam another corner areas of block that ignition channel is adjacent, first vertical lower brill, change into oblique after entering coal seam
Lower brill, is drilled into obliquely and changes horizontal cross into behind seat earth 0.5 to 2m place and creep into until connecting with ignition channel；Its water
Flat traversing section is parallel with a ducts for effluent air, away from a ducts for effluent air horizontal range more than 10m, and, light a fire at ignition channel
After from outlet passageway apply air pressure formed reverse firepower infiltration burning produce gap make channel of gas collection connect with outlet passageway；Institute
State inlet channel and use the mode of directional drilling, discharge into, from tetragon coal seam block, the tetragon coal that gas channel entrance is relative
Bore under layer block another side, first vertical lower brill, change into boring obliquely after entering coal seam, changing after seat earth 0.50 to 2 meters
For horizontal drilling, until connecting with outlet passageway.
In embodiment: it is vertical that described ignition channel, described outlet passageway, channel of gas collection are perpendicular to ground segment, inlet channel
It is respectively provided with bilayer sleeve well cementation, described channel of gas collection ramp down section and described inlet channel ramp down section in ground segment and uses mark
Quasi-petroleum casing pipe is cemented the well, and described horizontal segment is transferred described in a pillar with intensity.
In embodiment: described inlet channel quantity is less than ducts for effluent air quantity, and inlet channel is away from seat earth 0.50
Pass on the downside of channel of gas collection to 2 meters and outlet passageway interval connects.
And: described method farther includes: uses after ignition channel is lighted a fire and retreats cutting of burning extension channel of gas collection
Face is to 2 × 2m2Above, described inlet channel with extension after channel of gas collection in downside UNICOM.
In embodiment: ignition channel is arranged on one corner areas of tetragon coal seam block, and described drilled tunnel stretches into coal seam
Away from seat earth about 0.5 to 2m, being provided with at least two auxiliary firing passage I2, I3 around ignition channel 5 meters to 10 meters, two auxiliary
Helping ignition channel and ignition channel is triangular pattern in corner areas, and ignition channel passes through ignition channel gap in bottom and two
Individual auxiliary firing channel connection, described ignition channel gap is to realize by the way of cold conditions pressure break, described cold conditions pressure break
Mode be from one seal ignition channel mouth insert a trachea, from trachea to ignition channel gradually gas transmission pressurize, flow
Not less than 150Nm3/ h, preset pressure pause point in 5MPa pressure, in each pressure pause point, the time set
In, the change of monitors ignition passway pause point pressure simultaneously and other ignition channel mouth pressure, when other ignition channel mouth pressure
Power raises, and inputs the ignition channel mouth pause point abrupt pressure reduction of gas, then cold conditions pressure break completes, and has produced seam between ignition channel
Gap connects；Fracturing process needs monitor periphery boring pressure situation in real time.Coal seam can (flow be not within 5MPa under normal circumstances
Less than 150Nm3/ h) pressure-air effect under, conducting coal seam natural fissure, hole, process rate is generally 1～2m/d, coal
After layer natural fissure, hole connect, gas is infiltrated into periphery boring by pre-throughbore, shows the bust (pressure of pressure
Reduce to 0.003～0.009MPa/m), this is the cold conditions pressure break stage；Wherein: pressure pause point can be arranged on 1MPa pressure, 2
MPa pressure or 3 MPa pressure spots, the time of setting can be 6 hours, 12 hours or 24 hours, can pressure step be declined
It is considered as abrupt pressure reduction.
In embodiment: described from outlet passageway apply air pressure formed reverse firepower infiltration burning produce gap make gas collection lead to
The method that road connects with outlet passageway is: after gasification furnace is lighted a fire, when the flame range work surface in channel of gas collection backs to close to one
During individual outlet passageway, close gradually gas transmission pressurization, preset pressure pause point to the outlet of this outlet passageway, pause at each pressure
Point, within the time set, monitoring is given vent to anger the change of passway pause point pressure, when outlet passageway mouth pause point pressure is dashed forward
Fall, then channel of gas collection has produced with outlet passageway and has connected, the process pressurizeed in gradually gas transmission due to channel of gas collection in the fire of flame range
Power can form reverse osmosis burning and accelerate the formation in gap when there being micro gap.
The utilization of the present embodiment is: ignition channel I1、I2And I3Setting point firearm after cold conditions pressure break, at channel of gas collection D4Logical
Transfer separation in road and control gas injection point device, by I1Start to ignite, progressively build channel of gas collection, I in channel of gas collection building process1、
I2And I3As venthole, simultaneously by from outlet passageway apply air pressure formed gap that the infiltration burning of reverse firepower produces or
Person verifies that cracks in coal seam grows direction during giving vent to anger, and final channel of gas collection magnitude control is about more than 2 × 2m2；At D1、D2
And D3Transfer separation in (or one or two) passage and control gas injection point device to channel of gas collection D4Bottom, utilizes and forces oxidation side
Formula and D4Internal high temperature is ignited, D4Middle line traffic control passage specification is more than 2 × 2m2, D4Right side is to vertical drilling P1、P3, and P5Bottom
Not active combustion；Formed after stablizing gasification zone, gas collection district and system of giving vent to anger, can be by vertical drilling I1、I2And I3Continue as giving vent to anger
Hole or be optionally adjusted to osculum.
Advantage of this embodiment is that: utilize advanced coal seam directional drilling technique, be simultaneous for without occurrence condition
Underground gasification furnace and the channel of gas collection of coal seam integration construct, system of giving vent to anger, easily implement, short construction period；Channel of gas collection can
Dedusting, cooling, voltage stabilizing, equilibrium composition is carried out with the coal gas to each gasification tunnel；The system of giving vent to anger is positioned at outside region of stress concentration,
It can be avoided that collapse at the bottom of hole；And can according to gasification scale difference, neatly adjust gasification tunnel bar number, channel of gas collection length and
Venthole number.Utilization rate is low and direct products coal gas dust content, high temperature, high pressure, group fundamentally to solve coal resources gasification
Point differ and the relevant issues such as unstable bottom venthole, it is ensured that long-term, stable, the Effec-tive Function of gasification furnace.
Claims (10)
1. a high-efficiency coal underground gasification furnace, is included in ignition channel, the channel of gas collection of a tetragon coal seam block setting, enters
Gas passage and outlet passageway, it is characterised in that described ignition channel is a drilled tunnel vertically downward, ignition channel is arranged
In one corner areas of tetragon coal seam block, described drilled tunnel stretches into coal seam away from seat earth 0.5 to 2m, around ignition channel
Being provided with at least two auxiliary firing passage, two auxiliary firing passages are triangular pattern with ignition channel in corner areas, point
Fire passage is by ignition channel gap at bottom and two auxiliary firing channel connections, and described channel of gas collection is away from seat earth
0.5 to 2m place connects with ignition channel, and extends horizontally to another adjacent with ignition channel corner areas of tetragon coal seam block
Individual corner areas is then up to ground；Described outlet passageway be multiple from ground passage vertically downward, multiple outlet passageways
Be arranged as a row to be arranged in parallel with channel of gas collection, a ducts for effluent air block edge, tetragon coal seam and channel of gas collection level away from
From more than 10m；Described inlet channel quantity is passing channel of gas collection less than ducts for effluent air quantity away from seat earth 0.50 to 2 meters
Downside and outlet passageway interval connect；Described inlet channel is perpendicular to channel of gas collection and is parallel to each other through tetragon coal seam block four
Shape coal seam, limit block is upwardly into ground, the described outlet passageway connected with inlet channel relative to the another side edge at outlet passageway edge
Being connected with channel of gas collection in bottom by outlet passageway gap, described outlet passageway disconnected with inlet channel is logical by giving vent to anger
Gap, road connects with adjacent outlet passageway in bottom, and adjacent outlet passageway is the outlet passageway connected with inlet channel.
Underground gasification furnace the most according to claim 1, it is characterised in that said two auxiliary firing passage is arranged on gas collection
Passage both sides.
Underground gasification furnace the most according to claim 1, it is characterised in that the distance between described outlet passageway be 20m with
On.
Underground gasification furnace the most according to claim 1, it is characterised in that described ignition channel gap is by cold conditions pressure
The mode split realizes, and described outlet passageway gap is after firing by permeating at outlet passageway input air pressure and reverse firepower
Burning realizes.
Underground gasification furnace the most according to claim 1, it is characterised in that described ignition channel, described outlet passageway, gas collection
Passage is perpendicular to ground segment, inlet channel is perpendicular to ground segment and is respectively provided with casing cementing.
Underground gasification furnace the most according to claim 1, it is characterised in that described channel of gas collection is perpendicular to ground segment and level
Between Duan and inlet channel is perpendicular between ground segment with horizontal segment be to be connected by oblique section respectively, described oblique section uses standard
Petroleum casing pipe is cemented the well, and described horizontal segment transfers a pillar with intensity.
7. a high-efficiency coal underground gasification furnace construction method, be a tetragon coal seam block arrange ignition channel, gas collection lead to
The method of road, inlet channel and outlet passageway, outlet passageway is perpendicular to the passage on ground, wherein: ignition channel is at tetragon
One corner areas of coal seam block, inlet channel import and outlet passageway outlet respectively a row, each row are multiple, and one discharges into gas
Channel entrance and ducts for effluent air outlet are separately positioned on two relative edges of tetragon coal seam block, and described channel of gas collection is
One, a channel of gas collection is arranged on block outlet passageway side, tetragon coal seam and connects with ignition channel, it is characterised in that described
Channel of gas collection uses the mode of directional drilling to bore from tetragon coal seam another corner areas of block adjacent with ignition channel, first
The most vertical lower brill, changes into boring obliquely after entering coal seam, is drilled into obliquely and changes horizontal cross into behind seat earth 0.5 to 2m place
Creep into until connecting with ignition channel；Its horizontal cross Duan Yuyi ducts for effluent air is parallel, away from a ducts for effluent air horizontal range
More than 10m, and, after ignition channel is lighted a fire, apply air pressure from outlet passageway form the gap that the infiltration burning of reverse firepower produces
Channel of gas collection is made to connect with outlet passageway；Described inlet channel use directional drilling mode, from tetragon coal seam block
Discharge into and bore under the tetragon coal seam block another side that gas channel entrance is relative, first vertical lower brill, change into obliquely after entering coal seam
Boring, after seat earth 0.50 to 2 meters, changing horizontal drilling into, until connecting with outlet passageway.
Method the most according to claim 7, it is characterised in that described inlet channel quantity is less than exhaust passage quantity, enters
Gas passage is connecting through on the downside of channel of gas collection and outlet passageway interval away from seat earth 0.50 to 2 meters.
9. according to the method described in claim 7 or 8, it is characterised in that described method farther includes: light a fire at ignition channel
Rear use the cross section retreating burning extension channel of gas collection to 2 × 2m2Above, described inlet channel with extension after channel of gas collection exist
Downside UNICOM.
Method the most according to claim 7, it is characterised in that described from outlet passageway apply air pressure form reverse firepower
The method that the gap that infiltration burning produces makes channel of gas collection connect with outlet passageway is: after gasification furnace is lighted a fire, work as channel of gas collection
In flame range work surface when backing to close to an outlet passageway, close gradually gas transmission pressurization to the outlet of this outlet passageway, in advance
If pressure pause point, in each pressure pause point, within the time set, monitor the change of passway pause point pressure of giving vent to anger
Changing, when outlet passageway mouth pause point abrupt pressure reduction, then channel of gas collection has produced with outlet passageway and has connected.
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| CN110388200A (en) * | 2019-08-23 | 2019-10-29 | 新疆国利衡清洁能源科技有限公司 | Coal underground gasifying furnace and its construction method |
| CN113216908A (en) * | 2021-05-24 | 2021-08-06 | 东北石油大学 | Coal bed gas mining method and horizontal drilling equipment |
| CN117684918A (en) * | 2024-02-04 | 2024-03-12 | 中国矿业大学 | Method and device for extracting gas by utilizing coal seam waste heat in sectional advancing type heat injection mode |
| CN117684918B (en) * | 2024-02-04 | 2024-04-12 | 中国矿业大学 | Method and device for extracting gas by utilizing coal seam waste heat in sectional advancing type heat injection mode |
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