CN110159245A - Distribution note exhaust passage narrow strips coal underground gasifying furnace production system and method - Google Patents

Abstract

The invention belongs to coal underground gasification technology field, a kind of distributed note exhaust passage narrow strips coal underground gasifying furnace production system and method are disclosed, coal seam igniting in gasification furnace is successively carried out；Gasifying agent injection and formation gasification tunnel；Flame face retreats mobile and gas injection point and retracts；The row of coal gas is defeated；Temperature monitoring is out of service with gasification furnace；Gasification furnace filling also discloses a kind of distributed note exhaust passage narrow strips coal underground gasifying furnace production system.The present invention do not need manually in gasification furnace tunnel heading as gasifying agent injection lane, gasification tunnel and coal gas conveying lane, without after personnel exit construct gasification furnace with the external world tunnel large size be isolated it is closed；Accomplish not tunnel and do not destroyed coal seam integrality and airtightness, reached few exposure and interference coal seam, kept the complete structure of country rock, has made that there is good airtightness and pressure-bearing property during gasifier operation.

Description

Distribution note exhaust passage narrow strips coal underground gasifying furnace production system and method

Technical field

The invention belongs to coal underground gasification technology field more particularly to a kind of distributed note exhaust passage narrow strips coals Underground gasification furnace production system and method.

Background technique

Currently, the immediate prior art:

It melts and adopts relative to tradition machinery, underground coal gasification(UCG) is one of novel coal resource exploitation method.It is walked in coal seam Flame face (gasification reaction interface) is formed to direction and complicated redox reaction and pyrolysis of coal reaction occurs.Coal Lower stope need to meet inner space and external free space and keep isolation, make in reaction compartment that there are gas pressures, prevent gas Leak and be conducive to the progress of reaction.

Gas injection channel-reaction interface-exhaust passage will form smoothly air flow condition, make to be formed inside gasification furnace and stablize Air flow condition and stable state reaction interface morphosis, so that flame face is stablized to produce and gas and is guaranteed gas quality." three bands " Stabilization is concentrated, i.e. oxidized zone, zone of reduction and dry distillation & drying zone has stable size range and morphosis.In order to guarantee gas Changing has preferable reaction temperature in furnace, this requires having preferable accumulation of heat effect in gasification furnace, reaction zone coal temperature is high, It can be sufficiently preheated to reaction zone coal body.It is the basic demand of gasification furnace that combustion gasification, which reacts, and reaction interface can be led controllably.

Gas injection device can guide control flame face by the quantity and transfer position and range of setting gas injection point Combustion range and boundary, realize that entire working face combustion process can lead controllable requirement, pass through gasification furnace gas injection channel, gasification The Reasonable Arrangement in channel and exhaust passage determines the reasonable size of gasification furnace, keeps the rock-steady structure of gasification furnace boundary country rock, encloses Rock keeps air-tightness and stability, reaches the requirement of furnace body surrounding rock stability control.

Previous constructed coal underground gasifying furnace and production system, in gas injection and Surrounding Rock Control and entire gasification Controllable aspect can be led, has many deficiencies.One is a lack of effective gas injection device, and gasifying agent is caused to react empty in entire gasification furnace Between unordered diffusion, the unordered sprawling of flame face or combustion range have exceeded gasification range and the boundary of gasification furnace design, or Person causes to leave a large amount of unburned gasification coal bodies in gasification furnace, and the disorder of air-flow also brings reduction and the gasification furnace of gas quality The risk of safe operation；Second is that the control of gasification furnace surrounding rock stability is poor, to underground coal gasification(UCG) country rock and flame face heating power The cover stress distribution of coupling, movement distortion rule research is insufficient, understanding is unclear, and the gasification furnace size design done, which is not achieved, encloses The requirement of rock stability control leads to overlying strata large area caving, fissure zone Overgrowth, links up water-bearing layer, causes furnace gas Leakage, gas pressure decline, underground water excessively pour in, or even can flood the gasification furnace that goes out, and cause great interruption of service；Third is that thickness When coal seam and super high seam gasify, still using girdle or the arrangement of the single note exhaust passage of medium-thickness seam, It is not able to satisfy efficient, stable, high exploitation rate gasification requirement, causes note exhaust passage design unreasonable, cannot effectively realize Coal body is gasified totally in furnace.

Coal underground gasification technology (Underground Coal Gasification, UCG) is also known as original place coal gasification, Technique is that preservation is become chemical gas production from physics coal mining in the coal seam of underground, and its essence is the utility in coal (volatilizees Point, fixed carbon etc.) by way of the physics such as pyrolysis, burning, gasification and chemical conversion be changed into fuel gas.UCG by shaft building, Coal mining, three big techniques of gasification integrate, and have the advantages that production gas is at low cost, highly-safe and environmental benefit is good.UCG institute producing coal Gas cost is only the 25~50% of ground gasification furnace gasification, can be used as fuel gas generation, boiler oil and synthesis chemical products Unstripped gas, significantly reduce power generation or synthesis chemical products cost.UCG also has significant environmental benefit, greatly reduces combustion Coal pollution, the discharge of gangue and lime-ash, effectively solve the problems, such as the atmospheric haze of coal-fired initiation at present, and with carbon capture and seal up for safekeeping Technology combines, and can effectively reduce greenhouse gas emission.UCG worldwide receives extensive attention, the former Soviet Union, Europe Continent, the U.S., Japan, Australia, the multiple countries of China and Asia have carried out a large amount of theoretical research and type approval test.Cause This, underground coal gasification(UCG) is a kind of development approach of coal first, is to be known as second to the innovation of traditional coal mining method For coal-mining method；It from the point of view of its benefit, and is a kind of high carbon resource low-carbon exploitation clean energy resource new technology.The technology is low-quality (high-sulfur, high ash), high-dipping, girdle, deep fractures, " under three " press coal and routine techniques economy the residual delay coal such as can not adopt Exploitation use aspects have broad application prospects.

Main producing coal state, the world all increases the type approval test and industrialization promotion power of underground coal gasification(UCG) in recent years Degree, the U.S., Australia, Canada, South Africa, China etc. have carried out a large amount of field test, have pulled open underground coal gasification(UCG) quotient The prelude of industry popularization and industrialization.Coal in China underground gasification on-test, has been carried out two the sixties in last century so far Ten field tests several times has formd well formula and without well formula coal underground gasifying technology.Early in " national science technology in 1992 Long-and Medium-term Development outline " in white paper using underground coal gasification(UCG) as one of strategic objective and key technology.In " country, the Department of Science and Technology " 12th Five-Year Plan " scientific and technological development planning ", " planning of Chinese clean coal technology development in science and technology " 12th Five-Year Plan " ", State Council's " energy Develop " 12th Five-Year Plan " planning ", National Development and Reform Committee's " planning of Dissertation of Development of Coal Industry " 12th Five-Year Plan " " etc. clearly propose, coal will be broken through Lower gasification key technology bottleneck carries out the construction of underground coal gasification(UCG) demonstration project.In National Development and Reform Committee, Bureau of Energy's " energy technology Revolution innovate action plan (2016-2030) " in propose, key task first is that realize the innoxious production technique of coal wound Newly.Including underground gasification exploitation research and development and tackling key problem, and propose the year two thousand twenty target: single gasification mine year gasification coal 500,000 Ton realizes Industrial demonstration to the year two thousand thirty scale underground gasification exploitation mine.

Underground coal gasification(UCG) at this stage is still not carried out industrialization production, and one of major reason is exactly coal underground gas It is unstable to produce gas for the small scale of change.It on the one hand is to be influenced by the external hydrology and geological environment, gasification coal seam conditions (coal thickness, coal Matter etc.) and occurrence condition (geology, the hydrology, construction etc.) it is complicated and changeable, increase difficulty to Underground Coal Gasification Process, need people It is more for the factor that is regulated and controled；Second is that Underground Coal Gasification Process control means are limited, high temperature, gas by underground gasification space Body, coal body thermal fracture, surrouding rock stress, overlying strata are caving, fissure zone is developed etc., and factors influence, it is difficult to as underground gas producer Effective monitoring and control means are taken, the difficulty of artificial adjustment is increased.

Therefore, in order to solve coal underground gasifying furnace production system problems faced at this stage, need to research and develop a kind of and ground What matter environment and condition of coal seam occurrence were adapted, in particular for high seam and super high seam condition, controllable function can be led by having Coal underground gasifying furnace production system and technique, provide technical support to further realize the industrialization of underground coal gasification(UCG).

For different condition of coal seam occurrence, domestic and foreign scholars propose different types of underground coal gasification furnace structure And gasification production technique.In terms of type of furnace building of gasifying, come from the distributing position of gas injection channel, gasification tunnel and exhaust passage It sees, underground gasification furnace can be divided into several type of furnaces, i.e. blind hole furnace, a line oven, V-type furnace, U-shaped furnace and E type furnace etc., sent out again later The long fireplace of porous furnace, convertible note bleeding is illustrated.The research direction of external underground gasification is mainly without well formula coal Lower gasification process, by constructing coal underground gasifying furnace in ground drilling, the no-shaft UCG technique of comparative maturity includes linear Inject point backing technique (Controlled Retraction Injection Point, CRIP) and parallel orientation drilling well CRIP technique.

Last century the forties former Soviet Union has carried out live underground gasification test first, using two adjacent vertical drillings Respectively as the injection well and gas-producing well of gasifying agent, then using a variety of perforation methods, (such as firepower perforation, electric power is penetrated through, reversely Burning, air pressure break etc.) so that two vertical drilling bottoms is formed through gasification tunnel in coal seam, gas is then blasted by gas injection well Agent produces coal gas by gas-producing well.The gasification furnace building processing disadvantages are that perforation speed is slow, perforation directionality is poor, vertical well It penetrates through difficult when spacing is big or can not penetrate through；Vertical drilling spacing is smaller, and when taking over production, vertical drilling quantity is more, and investment is big； Without gas injection device in gasification furnace, gasifying agent diffusion combustion in entire gasification furnace causes combustion range and boundary can not be effective It is low to produce gas quality for control；Widened combustion range leads to overlying strata large area caving, and surrounding rock stability control effect is poor.Last century Since the seventies and eighties, using the U.S. as the American-European countries of representative, what is mainly researched and developed is no well formula CRIP technique, in gas injection controlling party Face is periodically retreated using the mobile gas injection point device of pull-tube type and is pulled gas injection point, every time by mobile one section of injection point backing away from From the process requirement builds large-scale gas injection bend pipe spiral pull unit on ground, and equipment investment is high, complex operation, note Gas bend pipe is in the closed difficulty of ground surface end, when coal seam buried depth is larger, is influenced by geological stress and drilling deformation, mobile gas injection Device operating reliability reduces.

The Chinese patent " no-shaft underground gasification process " of publication number CN101382065A constructs L-type gasification furnace, mainly Feature is to penetrate through multiple vertical drillings by Directional Drilling first, forms " one " line oven and arrange as outlet, firepower penetrates through in addition more A vertical drilling forms " one " line oven as gasification column, and the two collectively constitutes " L " type furnace.In the enlarged reproduction stage, continue to mend Add drilling extension gasification furnace.The shortcomings that technology be building gasification furnace needed for drilling hole amount it is more, horizontal directional drilling with it is multiple The perforation difficulty of vertical drilling is big；Multiple vertical drillings need multiple batches of high pressure firepower to penetrate through in coal seam, especially in gas Change in the case that furnace burns and to form burned out area and caving zone, fissure zone development, it is difficult to which the validity for guaranteeing the perforation of high pressure firepower is passed through Logical difficulty is big.Therefore the gasification furnace building and method of operation is complicated for operation, poor reliability.The China of publication number CN1121138A is specially Sharp " long-passage and large-section underground coal gasification in mine " constructs long-channel, big cross section underground gasification furnace, and being mainly characterized by can be Mine abandonment coal seam constructs gasification furnace, needs manually to tunnel heading as gasification tunnel, gasification tunnel length is generally higher than 150m, the big (2.5~4m of gasification drift section²).The shortcomings that technology is to need manually to build furnace machine to construction tunnel in gasification furnace Tool level is low, and there are personnel safety hidden danger；After personnel exit gasification furnace roadway construction, need to construct gasification furnace isolation it is closed, The adverse circumstances such as being caving by gasification furnace high-temperature, gas, overlying strata is influenced, it is difficult to effectively accomplish the closed of furnace gas that gasify；Gas Change and lack effective gas injection device in tunnel, gasifying agent is spread in entire tunnel, and combustion gasification reaction interface is entirely gasifying It is spread in tunnel, air turbulence and gasification furnace combustion range and boundary are difficult to effectively control.According to publication number CN103277082B Chinese patent " a kind of injection point backing formula underground coal gasification system and technique " construct a kind of E type structure gasification furnace, should It includes a centrally located gasifying agent injection tunnel and two coal gas conveying lanes that invention, which is mainly characterized by each gasification furnace, Road, three tunnel parallel arrangements, three tunnels one end connect the airway in coal seam, other end connection gasification tunnel.The gas The shortcomings that changing furnace building mode is to need manually to construct in coal seam to tunnel out tunnel in gasification furnace, is needed after personnel exit Divider wall is constructed in the one end in three tunnels connection airway.In the case where coal road high temperature is pyrolyzed dry and cracked environment, to high-temperature gas into Row has been effectively isolated quite big difficulty, is even difficult to be effectively isolated.Not only there are gas injection pipeline, coal in airway Air pipe, there are also air, once isolated failure gas leak, then easily cause serious accident.The coal gas that the patent determines is defeated Sending lane and gasifying agent to inject channel spacing distance is 30m (15m~50m), but does not provide correspondingly design considerations.Work as gasification When passage length reaches (30m × 2) 60m, it has been much larger than and has above covered directly top, the limited span pushed up always, therefore will cause to cover The large area caving of rock, fissure zone Overgrowth can seriously link up overlying aquifer, make in gasification furnace that water burst is excessive to be caused to flood furnace Accident even results in crack perforation earth's surface and causes gas leak, causes safety accident.

The shortcomings that prior art includes:

(1) existing furnace mode of building needs manually to lead in gasification furnace driving heading as gasifying agent injection lane, gasification Road and coal gas convey lane, need to construct gasification furnace after personnel exit and being isolated for extraneous channel is closed, in coal road high temperature heat Solve be difficult to construct under dry and cracked environment it is effective it is closed high-temperature gas is carried out completely isolated, and passage section is bigger, has carried out The difficulty being isolated entirely is bigger, once isolated failure will cause serious safety accident.

(2) lack effective gas injection pipeline and mobile gas injection device in existing gasification furnace gas injection tunnel.If gas injection is logical There is no gas injection pipeline in road, then gasifying agent is transmitted by the open-hole (or tunnel) in coal seam, causes flame face combustion boundary inverse Gas injection it is distinguished and admirable and on, combustion range is expanded in gas injection channel, combustion range and boundary in gasification furnace are not only expanded, can also Cause gas stream in the stove disorder of gasifying, gasifying agent and coal gas are mixed and burned, and reduce gas quality；If gas injection is not moved in channel When gas injection device or larger reserved gas injection port interval, then will lead to gasifying agent decanting point can not be with the orientation of flame face It moves and moves, gasifying agent increases from the distance that burned out area is diffused into flame face, leads to gas stream in the stove disorder of gasifying, equally It will lead to gas quality reduction.

(3) there is no propose in adaptable gasification furnace and furnace particular for high seam and super high seam for existing technology Exhaust passage arrangement is infused, due to high seam and the occurrence characteristics of super high seam, single plane formula note exhaust passage arrangement Mode cannot take into account the coal body in high seam short transverse, cause top seam effectively vaporization, residual in gasification furnace Coal is more, and recovery ratio reduces in gasification furnace.

(4) existing technology controls gasification furnace surrounding rock stability poor, to underground coal gasification(UCG) country rock and flame face The cover stress distribution of Thermal-mechanical Coupling, movement distortion rule research is insufficient, understanding is unclear, and the gasification furnace size design done is not up to The requirement controlled to surrounding rock stability, leads to overlying strata large area caving, fissure zone Overgrowth, links up water-bearing layer, causes in furnace Gas leakage, gas pressure decline, underground water excessively pour in, or even can flood the gasification furnace that goes out, and cause great interruption of service.

In conclusion problem of the existing technology is:

(1) previous constructed coal underground gasifying furnace and production system, in gas injection and Surrounding Rock Control and entire gasification Process can lead controllable aspect, have deficiency.

(2) it is unstable to produce gas for the small scale of underground coal gasification(UCG).

(3) existing technology easily causes interruption of service, safety accident, and gas quality is low, and recovery ratio is low.

Solve the difficulty of above-mentioned technical problem:

It is insufficient to theoretic knowledge of the Underground Coal Gasification Process country rock Thermal-mechanical Coupling effect to Rock Damage characteristic, shortage pair Underground coal gasification(UCG) band rationally adopts wide design method and foundation；It is there are one difficult point to Underground Coal Gasification Process Gas injection guidance control aspect, lack effective mobile gas injection device, gas injection point position and gasification reaction interface location caused to be moved It is dynamic to mismatch, cause gas generation process unstable.

Solve the meaning of above-mentioned technical problem:

It solves the above problems, has to the gas injection control for realizing underground coal gasification(UCG) stable operation and surrounding rock stability control There is important meaning, for realizing that underground coal gasification(UCG) industrialization has realistic meaning early.

Summary of the invention

In view of the problems of the existing technology, the present invention provides a kind of distributed note exhaust passage narrow strips coal undergrounds Gasification furnace production method.

The invention is realized in this way a kind of distributed note exhaust passage narrow strips coal underground gasifying furnace production method packet It includes:

Step 1, coal seam igniting in gasification furnace.

Step 2, gasifying agent injection and formation gasification tunnel.

Step 3, flame face retreat mobile and gas injection point and retract.

The row of step 4, coal gas is defeated.

Step 5, temperature monitoring are out of service with gasification furnace.

Step 6, gasification furnace filling.

Further, coal seam igniting includes: in the gasification furnace of the step 1

In underground ventilating pedestrian lane, gas injection pipeline expert in gas injection channel is into ignitron to gas injection channel end point Fire point position, inputs high heating value fuel gas and oxygen by ignitron, is lighted by the electronic lighter of ignitron front end flammable Gas ignites the coal seam of ignition point position, completes coal seam igniting in gasification furnace.

Further, the gasifying agent injection of the step 2 and formation gasification tunnel include:

After coal seam is ignited, ignitron exits gas injection channel, bores through ground gasifying agent preparation station, ground injecting gas pipeline, gas injection Gas injection pipeline in well casing road, ventilation pedestrian lane, gas injection pipeline input gasifying agent continues to make coal seam to ignition location in gas injection channel Combustion gasification.Combustion gasification position is gradually extended by gas injection channel and exhaust passage tie point, in gas injection channel and exhaust passage Between formed gasification reaction interface, formed flame face.

Further, the flame face of the step 3, which retreats movement and retracts with gas injection point, includes:

Flame face will be moved along the retrogressing of the length direction of narrow strips gasification furnace, and in gas injection channel air injection pipe road etc. The hot melten type elastomeric connector of spacing arrangement will successively be in flame face position, the high temperature action near flame face Under, hot melten type elastomeric connector successively disconnects, new gas injection port is sequentially formed on air injection pipe road, by new gas injection port continue to Flame face provides gasifying agent.Gasifying agent decanting point is set to be spaced and retract as the retrogressing of flame face is mobile.

Further, the row of the coal gas of the step 4 is defeated includes:

The coal gas produced in gasification furnace is through flame face, exhaust passage, gas exhaust piping, ventilation pedestrian lane inside exhaust pipe Road, exhaust wellbore tubing, ground gas exhaust piping reach ground coal gas gas point.

Further, the temperature monitoring with gasification furnace of the step 5 are out of service includes:

The temperature value of real-time monitoring temperature monitoring temperature in drill hole measuring point, when roof coal petrography point of interface, seat earth When the temperature value of coal petrography point of interface reaches close to 800~1000 DEG C of flame face high temperature, flame face reaches gasification furnace The position of terminal mining line stops injecting oxygen or air into gasification furnace, is changed to injection vapor, keeps gasification furnace out of service.Work as coal When the temperature value of layer top plate coal petrography point of interface and seat earth coal petrography point of interface is reduced to 100 DEG C or less, and monitor to be discharged Gas component CO concentration when being reduced to zero, then gasification furnace extinguishes completely.

Further, the gasification furnace of the step 6, which fills, includes:

After gasification furnace is out of service, through ground filling pumping plant, ground filling piping, filling wellbore tubing, ventilation pedestrian lane Interior filling piping, gasification furnace gas injection pipeline are transported to gasification furnace burned out area for slurry is filled, and are gradually filled with entire gasification furnace combustion Dead zone.

Implement the distributed note exhaust passage narrow strips coal underground gas another object of the present invention is to provide a kind of Change the distributed note exhaust passage narrow strips coal underground gasifying furnace production system of furnace production method, the distributed note exhaust is logical Road narrow strips coal underground gasifying furnace production system includes:

The a plurality of parallel exhaust that a plurality of parallel gas injection channel near bottom is set, coal seam near top is set Channel and the drilling of a plurality of temperature monitoring.

The gas injection channel and exhaust passage are from gasification seat earth ventilation orientation of the pedestrian lane towards drilling in coal Drilled tunnel, including gasification furnace outside rock horizontal segment and rock bending section and gasification furnace in coal seam section.

The coal seam section in gasification furnace, the gas injection channel are along the coal bed drilling channel that bottom tunnels, tunneling direction It is downward along coal seam tendency.

The exhaust passage be along close to coal seam top driving coal bed drilling channel, tunneling direction be along coal seam be inclined to Under.

The coal seam section in gasification furnace, gas injection channel is along coal seam tendency straight line driving, close to when reaching design length, except being used for Outside the gas injection channel of ignition function, other a plurality of gas injection channels are bent driving towards the ignition point of ignition channel, and run through one Point.

Exhaust passage and gas injection channel are spatially parallel, towards gas injection channel when close to gas injection channel end point is reached Distal point bending driving, and be connected to the breakthrough point in gas injection channel, all gas injection channels and exhaust passage pass through in coal seam Pass through ignition point position.

Temperature monitoring drilling is located at gas injection channel and exhaust passage drilling middle position, is parallel to gas injection channel in rock section It is crept into exhaust passage, until roof coal petrography intersection stops behind exposure coal seam.

In at roof coal petrography intersection, seat earth coal petrography intersection and ventilation pedestrian lane wall surface in drilling Between position be respectively arranged temperature thermocouple, monitor the temperature value of position, thermocouple lead is drilled by temperature monitoring and drawn, even Jointing temp monitors system.

It is disposed with channel pillar in the gas injection channel of coal seam section and exhaust passage in gasification furnace, the channel pillar is sieve Pipe, surface layout have a certain size circular hole, and the channel pillar is used to support gas injection channel and exhaust passage coal wall.

Gas injection pipeline, transfer passage of the gas injection pipeline as gasifying agent are disposed in the pillar of gas injection channel.

Further, the air injection pipe road is arranged in equal spacing with hot melten type elastomeric connector, when flame face is moved to When the hot melten type elastomeric connector position, under high temperature and certain time effect, the hot melten type elastomeric connector is disconnected, Air injection pipe road forms new gas injection port, and injected gasifying agent is enable directly to be transported to flame face position with regard to near-earth.

With the continuation displacement of flame face, the hot melten type elastomeric connector of air injection pipe road successively disconnects being formed The gas injection port of new gas injection port, air injection pipe road is retreated with the displacement of flame face.

Two sections of adjacent gas injection pipelines in gasification furnace coal seam section, rock bending section and rock horizontal segment are logical outside gasification furnace It crosses snap-on-connector to link together, the underground passed through outside gasification furnace in flange bolt and gasification furnace separate ventilation pedestrian lane is infused Air pipe connection.

Further, rock horizontal segment of the exhaust passage outside gasification furnace is disposed with gas exhaust piping, the adjacent row in both ends Air pipe is linked together by flange bolt, and finally with the downhole air exhaust piping connection in gasification furnace separate ventilation pedestrian lane.

Sealing of hole is carried out in gas injection channel, exhaust passage and temperature monitoring drilling rock section, fills high temperature resistant cement, high temperature resistant Organic or inorganic heat-barrier material carries out closed.

The ventilation pedestrian lane is the stone head for being arranged in gasification seat earth, the ventilation horizontal absolute altitude in pedestrian lane and gasification Furnace upper end absolute altitude is identical, and has certain horizontal distance with gasification furnace upper extreme point, has certain vertical range with gasification coal seam.

The ventilation pedestrian lane is the construction tunnel in gas injection channel, exhaust passage and temperature monitoring drilling, using being arranged in Horizontally toward directional drilling is tunneled in coal seam to the directional drilling machine divulged information in pedestrian lane, is bent and bores by certain curvature when closing on seat earth Into into after coal seam, the coal seam gas injection channel along seat earth driving gasification furnace, is the 2/ of coal seam height below the top of coal seam 3 height and positions tunnel the coal seam exhaust passage in gasification furnace.

Underground gas injection pipe road, gas exhaust piping, filling and injecting slurry pipeline are equipped in the ventilation pedestrian lane.

It is described ventilation pedestrian lane be also used to gasifier operation during manual operation.

The vertical gas injection drilling well in ground is connected with underground ventilating pedestrian lane, pipeline is equipped in gas injection drilling well, and logical with underground The gas injection pipeline being in fashion in people lane is connected with auxiliary gas injection pipeline, is the gas injection pipeline in underground ventilating pedestrian lane and auxiliary gas injection Pipeline provides gasifying agent.

The vertical filling drilling well in ground is connected with underground ventilating pedestrian lane, pipeline is equipped in filling drilling well, and logical with underground The filling piping being in fashion in people lane is connected, and provides filling slurry for the filling piping in underground ventilating pedestrian lane.

The vertical exhaust drilling well in ground is connected with underground ventilating pedestrian lane, pipeline is equipped in exhaust drilling well, and logical with underground The downhole air exhaust pipeline being in fashion in people lane is connected, and the coal gas in the downhole air exhaust pipeline divulged information in pedestrian lane is transported to ground coal In air pipe.

In conclusion advantages of the present invention and good effect are as follows:

The invention proposes a kind of method for arranging of note exhaust passage for high seam and super high seam underground gasification, structures A kind of distributed note exhaust passage narrow strips gasification furnace has been built, i.e., has beaten Directional Drilling towards coal seam in down-hole coal bed floor rock lane Well, along seat earth drilling well distribution gas injection channel, close to coal seam top certain position drilling well distribution exhaust passage.

The present invention utilizes down-hole coal bed floor rock lane, beats directed drilling towards coal seam, a plurality of flat including bottom The exhaust passage drilling well of a plurality of parallelly distribute on of the gas injection channel drilling well and coal seam top of row distribution, all parallel note exhausts Channel drilling well end perforation building narrow strips underground gasification furnace.This is built furnace method and does not need manually to tunnel coal seam lane in gasification furnace Road conveys lane as gasifying agent injection lane, gasification tunnel and coal gas, without the building gasification furnace after personnel exit and extraneous lane The large size isolation in road is closed.Accomplish not tunnel and do not destroyed coal seam integrality and airtightness, has reached few exposure and interference coal Layer, keeps the complete structure of country rock, makes have preferable airtightness and pressure-bearing property during gasifier operation.

The present invention, which is compared with the prior art, further embodies advantages of the present invention.It is as follows that technology compares table.

The invention also provides the designs of narrow strips gasification furnace to adopt wide and distributed gas injection channel and exhaust passage laying number The determination principle of amount includes:

1) the total linear spacing width of all gas injections or exhaust passage is plus the extension width in two gas injection channels of outermost The design width of gasification furnace, the design width should be less than multiplied by certain safety coefficient k or directly push up equal to coal seam or push up always Limited span.

2) single gas injection channel has certain horizontal extension width in underground gasification process, and two adjacent gas injections are logical The reasonable spacing in road should be equal to a horizontal extension width value.According to the two principles, it can determine and adopt width in certain gasification furnace Under reasonably gas injection number of channels.

3) quantity of exhaust passage subtracts one on the basis of gas injection number of channels.

The present invention can solve the underground gasification of thick coal seam, the especially high seam to thickness greater than 3.5m or special thick coal Layer has preferable effect.It is endless to avoid coal body gasification in same plane note exhaust bore arrangement mode bring gasification furnace Full problem.

The present invention utilizes down-hole coal bed floor rock lane, the method building gasification beating directed drilling towards coal seam and penetrating through Furnace.This is built furnace method and is not needed manually to tunnel heading in gasification furnace as gasifying agent injection lane, gasification tunnel and coal gas Convey lane, without after personnel exit construct gasification furnace with the external world tunnel large size be isolated it is closed.Accomplish not tunnel and not Coal seam integrality and airtightness are destroyed, coal seam is disclosed and interfere less as far as possible, there is gasifier operation in the process preferable closed Property and pressure-bearing property.

The narrow strips gasification furnace that the present invention constructs, length-width ratio is between 10:1~20:1, and gasification furnace adopts width and is less than overlying strata Limited span, do not destroy the complete structure of overlying strata, not will cause the large area caving of overlying strata, effective control overlying mining rock fissure zone Development height guarantees the air-tightness and pressure-bearing property of gasification furnace.It is combined with burned out area filling, there is good CONTROL OF STRATA MOVEMENT effect With burned out area pollutant catabolic gene effect.

Have gas injection pipeline in gasification furnace gas injection of the present invention tunnel and effectively move gas injection device, on air injection pipe road etc. Spacing has laid hot melten type elastomeric connector, when flame face is moved to hot melten type elastomeric connector position, hot melten type bullet Property connector successively disconnects and sequentially forms on air injection pipe road new gas injection port, to make gasifying agent decanting point with flame work Make the retrogressing movement in face and be spaced and retract, guarantees the smooth and flame face reaction interface form of gasification gas stream in the stove state The stabilization of structure.

The invention proposes the designs of narrow strips gasification furnace to adopt wide and distributed gas injection channel and exhaust passage arrangement quantity Determination principle, by note exhaust passage reasonable Arrangement come reach the abundant gasification to high seam and ultra-thick coal bed fire It burns, makes to form smoothly air flow condition and reasonable gasification reaction interface configuration structure in gasification furnace.

Detailed description of the invention

Fig. 1 is that distributed note exhaust passage narrow strips coal underground gasifying furnace production system provided in an embodiment of the present invention is cutd open Face figure.

Fig. 2 is distributed note exhaust passage narrow strips coal underground gasifying furnace production method stream provided in an embodiment of the present invention Cheng Tu.

Fig. 3 is distributed note exhaust passage narrow strips coal underground gasifying furnace production system A- provided in an embodiment of the present invention A sectional view.

Fig. 4 is distributed note exhaust passage narrow strips coal underground gasifying furnace production system B- provided in an embodiment of the present invention B sectional view.

When Fig. 5 is that distributed note exhaust passage narrow strips coal underground gasifying furnace provided in an embodiment of the present invention operates normally Phase sectional view.

Fig. 6 is distributed note exhaust passage narrow strips coal underground gasifying furnace normal system C- provided in an embodiment of the present invention C sectional view.

Fig. 7 is distributed note exhaust passage narrow strips coal underground gasifying furnace normal system D- provided in an embodiment of the present invention D sectional view.

Fig. 8 is distributed note exhaust passage narrow strips coal underground gasifying furnace note exhaust system provided in an embodiment of the present invention Distribution map.

In figure: 1, gas injection channel, 1-1, gas injection channel rock horizontal segment；1-2, gas injection channel rock bending section；2, it is vented Channel；2-1, exhaust passage rock are horizontal；2-2, exhaust passage rock bending section；3, temperature monitoring drills；4, ventilation pedestrian lane； 5, coal seam；6, temperature thermocouple；7, downhole air exhaust pipeline；8, underground gas injection pipe road；9, filling and injecting slurry pipeline；10, buckle-type connects Connect device；11, hot melten type elastomeric connector；12, channel pillar；13, gas injection pipeline；14, gas exhaust piping.

Specific embodiment

In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to Limit the present invention.

In the prior art, previous constructed coal underground gasifying furnace and production system, in gas injection and Surrounding Rock Control and Entire gasification can lead controllable aspect, have deficiency.It is unstable to produce gas for the small scale of underground coal gasification(UCG).Existing technology Interruption of service, safety accident are easily caused, gas quality is low, and recovery ratio is low.

To solve the above-mentioned problems of the prior art.The present invention is described in detail with reference to the accompanying drawing.

As shown in Figure 1, distributed note exhaust passage narrow strips coal underground gasifying furnace production provided in an embodiment of the present invention System includes:

Gas injection channel 1, gas injection channel rock horizontal segment 1-1, gas injection channel rock bending section 1-2, exhaust passage 2, exhaust Channel rock horizontal segment 2-1, exhaust passage rock bending section 2-2, temperature monitoring drilling 3, ventilation pedestrian lane 4, coal seam 5, thermometric Thermocouple 6, downhole air exhaust pipeline 7, underground gas injection pipe road 8, filling and injecting slurry pipeline 9.

Gas injection channel 1, exhaust passage 2, temperature monitoring drilling 3 are arranged in coal seam 5.Gas injection channel 1 and exhaust passage 2 are equal For from the directional drilling channel crept into towards coal seam 5 of ventilation pedestrian lane 4, including gasification furnace outside rock horizontal segment (1-1,2-1) With coal seam section in rock bending section (1-2,2-2) and gasification furnace.

Temperature monitoring drilling 3 is located at 2 middle position of gas injection channel 1 and exhaust passage, is parallel to gas injection channel 1 and exhaust is logical It creeps into road 2.Roof coal petrography point of interface, seat earth coal petrography point of interface and close ventilation pedestrian lane wall surface in the drilling Temperature thermocouple 6 is arranged in parallel in position.

Ventilation is equipped with underground gas injection pipe road 8, gas exhaust piping 7, filling and injecting slurry pipeline 9 in pedestrian lane 4.

In embodiments of the present invention, present system include be arranged in a plurality of parallel gas injection channel 1 near bottom, A plurality of parallel exhaust passage 2 and a plurality of temperature monitoring drilling 3 of coal seam near top are set.The gas injection channel 1 and exhaust Channel 2 is the directional drilling channel crept into from gasification coal seam floor rock lane (i.e. ventilation pedestrian lane 4) towards coal seam 5, including Coal seam section in rock horizontal segment (1-1,2-1) and rock bending section (1-2,2-2) and gasification furnace outside gasification furnace.Gasifying Coal seam section in furnace, the gas injection channel 1 be along the coal bed drilling channel that bottom tunnel, tunneling direction for along coal seam be inclined to Under.The exhaust passage 2 is along the coal bed drilling channel close to coal seam top driving, and tunneling direction is downward along coal seam tendency. The coal seam section in gasification furnace, gas injection channel 1 is along coal seam tendency straight line driving, close to when reaching design length, except for lighting a fire Outside the gas injection channel of function, other a plurality of gas injection channels 1 are bent driving towards the ignition point of ignition channel, and run through a bit. Exhaust passage 2 is spatially parallel with gas injection channel 1, towards 1 end of gas injection channel when close to 1 distal point of gas injection channel is reached Point bending driving, and be connected to the breakthrough point in gas injection channel 1, all gas injection channels 1 and exhaust passage 2 penetrate through in coal seam In a bit, i.e. ignition point position.

The distributed note exhaust passage by a variety of laying modes, the laying quantity of gas injection channel 1 and exhaust passage 2 Principle are as follows: (1) the total linear spacing width of all gas injections or exhaust passage is plus the extension width in two gas injection channels 1 of outermost The design width of gasification furnace, the design width should be less than multiplied by certain safety coefficient k or directly push up equal to coal seam or push up always Limited span.(2) single gas injection channel 1 has certain horizontal extension width, two adjacent notes in underground gasification process The reasonable spacing in gas channel 1 should be equal to a horizontal extension width value.According to the two principles, can determine in certain gasification furnace Adopt it is wide under reasonably 1 quantity of gas injection channel.(3) quantity of exhaust passage 2 subtracts one on the basis of 1 quantity of gas injection channel. For being set as " three into two go out " to infuse exhaust passage, i.e., three gas injection channels 1 of wide interior arrangement, two rows are adopted in gasification furnace design Gas channel 2, the sum of the horizontal extension width in three gas injection channels 1 are that width is adopted in gasification furnace design.By reasonably arrange its Position in coal seam enables high seam or ultra-thick coal bed in the sufficient gasification, and combustion in underground.Three gas injection channels 1 it is total between Width is adopted away from the design that the extension width plus two sides gas injection channel 1 is gasification furnace, the length in coal seam section gas injection channel 1 in gasification furnace Degree is the design length of gasification furnace, and gasification furnace adopts that the wide lenth ratio relative to gasification furnace is smaller, and ratio is generally in 1:10 ~1:20 or so.Therefore entire gasification furnace is similar to a narrow strips, referred to as fillet belt gasification furnace.

The temperature monitoring drilling 3 is located at gas injection channel 1 and the drilling of exhaust passage 2 middle position, is parallel in rock section Gas injection channel 1 and exhaust passage 2 are crept into, until roof coal petrography intersection stops behind exposure coal seam.Coal in the drilling Middle position at layer top plate coal petrography intersection, seat earth coal petrography intersection and ventilation 4 wall surface of pedestrian lane is respectively arranged 1 survey Galvanic couple 6 is warmed, 3 thermocouples of meter is arranged altogether in one borehole, monitors the temperature value of above-mentioned 3 positions, thermocouple lead respectively It is drawn by temperature monitoring drilling 3, connects temperature monitoring system, each band gasification furnace can arrange 4 temperature monitoring drillings 3.

Channel pillar 12, the channel pillar are disposed in the gas injection channel 1 of coal seam section and exhaust passage 2 in gasification furnace 12 be screen casing, and surface layout has a certain size circular hole, and the channel pillar 12 plays support gas injection channel 1 and 2 coal of exhaust passage The effect of wall, circular hole also help that gasifying agent is diffused into flame face and coal gas is pooled to exhaust passage.In gasification furnace Outer rock horizontal segment (1-1,2-1) and rock bending section (1-2,2-2), the channel pillar in gas injection channel 1 and exhaust passage 2 For common steel tube, two sections of adjacent steel pipes are linked together by flange bolt.

Gas injection pipeline 13 is disposed in gas injection channel pillar 7, the gas injection pipeline 13 is logical as the conveying of gasifying agent Road.It is arranged in equal spacing with hot melten type elastomeric connector 11 on the gas injection pipeline 13, when flame face is moved to the hot melt When formula 11 position of elastomeric connector, under high temperature and certain time effect, the hot melten type elastomeric connector 11 is disconnected, in gas injection New gas injection port is formed on pipeline 13, injected gasifying agent is enable directly to be transported to flame face position with regard to near-earth, is guaranteed The stability of flame face reaction interface morphosis.With the continuation displacement of flame face, on gas injection pipeline 13 Hot melten type elastomeric connector 10 successively disconnect and form new gas injection port, thus the gas injection port on gas injection pipeline 13 is with flame work Make the displacement in face and retreat, reaches the control requirement of mobile gas injection.Two sections of adjacent gas injection pipelines 13 are in gasification furnace The outer rock bending section of coal seam section, gasification furnace and rock horizontal segment are linked together by snap-on-connector 10, in gasification furnace It is connect outside by flange bolt with the underground gas injection pipe road 8 in gasification furnace separate ventilation pedestrian lane.

Rock horizontal segment of the exhaust passage 2 outside gasification furnace is disposed with gas exhaust piping, the adjacent gas exhaust piping in both ends It is linked together by flange bolt, and is finally connect with the downhole air exhaust pipeline 7 in gasification furnace separate ventilation pedestrian lane.

Sealing of hole is carried out in gas injection channel, exhaust passage and temperature monitoring drilling rock section, fills high temperature resistant cement, high temperature resistant Organic or inorganic heat-barrier material carries out closed, it is ensured that the isolation of gasification furnace inner space and gasification furnace external environment.

It is described ventilation pedestrian lane 4 be arranged in gasification seat earth stone head, the horizontal absolute altitude in ventilation pedestrian lane 4 and The furnace upper end absolute altitude that gasifies is identical, and has certain horizontal distance with gasification furnace upper extreme point, with gasification coal seam have it is certain it is vertical away from From the security isolation of the horizontal distance and the certifiable ventilation pedestrian lane and gasification furnace heated effluent field of vertical range.The ventilation Pedestrian lane 4 is the construction tunnel in gas injection channel 1, exhaust passage 2 and temperature monitoring drilling 3, is divulged information in pedestrian lane 4 using being arranged in Directional drilling machine horizontally toward directional drilling is tunneled in coal seam, be bent and creep by certain curvature when closing on seat earth, into coal seam Afterwards, coal seam gas injection channel 1 along gasification furnace is tunneled along seat earth, is 2/3 height and position of coal seam height below the top of coal seam Tunnel the coal seam exhaust passage 2 in gasification furnace.Underground gas injection pipe road 8 is equipped in the ventilation pedestrian lane 4, gas exhaust piping 7, is filled Fill out grouting pipeline 9.The ventilation pedestrian lane 4 be also simultaneously gasifier operation during manual operation lane, transport and lead in tunnel The requirements such as equipment conveying, drilling construction, Gas, the carbon dioxide that wind meets existing coal mining are gushed out, personnel breathe.

The vertical gas injection drilling well of a bite is played from ground to be connected with underground ventilating pedestrian lane 4, and pipeline is equipped in gas injection drilling well, and With in underground ventilating pedestrian lane 4 gas injection pipeline and auxiliary gas injection pipeline be connected, can be underground ventilating pedestrian lane 4 in air injection pipe Road and auxiliary gas injection pipeline provide gasifying agent.

The vertical filling drilling well of a bite is played from ground to be connected with underground ventilating pedestrian lane 4, and pipeline is equipped in filling drilling well, and It is connected with the filling piping in underground ventilating pedestrian lane 4, filling slurry can be provided for the filling piping in underground ventilating pedestrian lane 4 Material.

The vertical exhaust drilling well of a bite is played from ground to be connected with underground ventilating pedestrian lane 4, and pipeline is equipped in exhaust drilling well, and It is connected with the downhole air exhaust pipeline 14 in underground ventilating pedestrian lane 4, it can be by the coal in the downhole air exhaust pipeline in pedestrian lane 4 of divulging information Gas is transported in the gaspipe line of ground.

The drilling of gas injection channel, exhaust passage drilling, the aperture of temperature monitoring drilling and directed drilling parameter are wanted in the present invention According to specific ocurrence of coal seam state (such as seam inclination, thickness) and gasification furnace oil in place, gasification scale, service year Limit, production gas scale etc. determine that reasonable size section is generally between 100~300mm.

The arrangement quantity of distributed note exhaust drilling of the invention has a variety of adjustable schemes, according to roof preservation Situation, width is adopted in design has different numerical value, and also slightly different for the width of single gas injection channel extension, thus the distributed row of note The quantity in gas channel is not also identical.In a general case, the laying of distributed note exhaust passage can include: 2 gas injection channels+ 1 exhaust passage.3+2, gas injection channel exhaust passages.4+3, gas injection channel exhaust passages etc..

Gas injection channel of the present invention and the driving position of exhaust passage drilling are not limited to be located at bottom close to floor strata Position, can according to the design needs, positioned at the lower part, middle and lower part or middle position of seat earth, apart from seat earth rock stratum There is certain distance.It is also possible to be influenced by seat earth fold fluctuating, gas injection channel and exhaust passage bore portion are located at coal seam In floor rock.

Channel pillar, gas injection pipeline and gas exhaust piping single-unit length of the present invention will be according to drilling parameters and in-site installation condition Depending on, and different installation sites can be different, general reasonable single-unit length range is in 3m~6m.

The clipping room of hot melten type elastomeric connector of the present invention is away from by gasification furnace parameters, (such as gasification coal seam thickness, gasification furnace are stored up Amount, flame face movement speed, gasification tunnel length) and the influences such as mobile gas injection control effect are spaced, when gasification coal seam It is thicker, reserves are larger, flame face movement speed is relatively slow, gasification tunnel is longer, when needing to improve mobile gas injection control effect, The spacing of hot melten type elastomeric connector can suitably be increased.Otherwise it is opposite.

As shown in Fig. 2, distributed note exhaust passage narrow strips coal underground gasifying furnace production provided in an embodiment of the present invention Method includes:

S101: coal seam is lighted a fire in gasification furnace.

S102: gasifying agent injection and formation gasification tunnel.

S103: flame face retreats mobile and gas injection point and retracts.

S104: the row of coal gas is defeated.

S105: temperature monitoring is out of service with gasification furnace.

S106: gasification furnace filling.

In embodiments of the present invention, coal seam igniting includes: in the gasification furnace of step S101

In underground ventilating pedestrian lane, gas injection pipeline expert in gas injection channel is into ignitron to gas injection channel end point Fire point position, inputs high heating value fuel gas and oxygen by ignitron, is lighted by the electronic lighter of ignitron front end flammable Gas ignites the coal seam of ignition point position, completes coal seam igniting in gasification furnace.

In embodiments of the present invention, the gasifying agent injection of the step S102 and formation gasification tunnel include:

After coal seam is ignited, ignitron exits gas injection channel, at this time through ground gasifying agent preparation station → ground injecting gas pipeline → Gas injection pipeline input gasifying agent (including air, oxygen in gas injection pipeline → gas injection channel in gas injection wellbore tubing → ventilation pedestrian lane Gas and water steam and its mixing) to ignition point position, continue that coal combustion is made to gasify.Combustion gasification position is by gas injection channel and row Gas channel tie point gradually extends, and gasification reaction interface is formed between gas injection channel and exhaust passage, namely form flame work Make face.

The flame face of step S103 retreats mobile retract with gas injection point

Gasification furnace during normal operation, flame face will along the length direction of narrow strips gasification furnace retreat move, The hot melten type elastomeric connector that air injection pipe road is equally spaced in gas injection channel will successively be in flame face position, in fire Nearby under high temperature action, hot melten type elastomeric connector successively disconnects flame working face, and new gas injection is sequentially formed on air injection pipe road Mouthful, continued to provide gasifying agent to flame face by new gas injection port.To make gasifying agent decanting point with flame face It retreats mobile and is spaced and retracts, guarantee the smooth and flame face reaction interface morphosis of gasification gas stream in the stove state Stablize.

The row of the coal gas of step S104 is defeated to include:

The coal gas produced in gasification furnace is through flame face, exhaust passage, gas exhaust piping, ventilation pedestrian lane inside exhaust pipe Road, exhaust wellbore tubing, ground gas exhaust piping reach ground coal gas gas point.

The step S105 temperature monitoring is out of service with gasification furnace to include:

The temperature value of real-time monitoring temperature monitoring temperature in drill hole measuring point, when roof coal petrography point of interface, seat earth When the temperature value of coal petrography point of interface reaches close to flame face high temperature (800~1000 DEG C), it is believed that flame face Gasification furnace the position of terminal mining line is reached, has stopped injecting oxygen (or air) into gasification furnace at this time, be changed to injection vapor, make gas It is out of service to change furnace.When the temperature value of roof coal petrography point of interface and seat earth coal petrography point of interface is reduced to 100 DEG C or less When, and monitoring the gas component CO concentration of discharge when being reduced to zero, then gasification furnace extinguishes completely.

The gasification furnace of step S106 fills

After gasification furnace is out of service, pumping plant → ground filling piping → filling wellbore tubing → ventilation pedestrian is filled through ground Entry-in packing pipeline → gasification furnace gas injection pipeline is transported to gasification furnace burned out area for slurry is filled, and is gradually filled with entire gasification furnace Burned out area.

Application principle of the invention is further described combined with specific embodiments below.

Present invention mainly solves the geological structures and tax of the high seam how being directed in gasification and super high seam burning Surrouding rock stress distribution and movement distortion rule under condition, the physical and mechanical parameter of overlying strata, Thermal-mechanical Coupling are deposited, a kind of distribution is established Exhaust passage narrow strips underground coal gasification furnace is infused, it is made to have preferable Surrounding Rock Control effect.It is distributed by reasonable cloth Quantity, the position etc. in gas injection channel and distributed exhaust passage make to form smoothly air flow condition and reasonable gas in gasification furnace Change reaction interface morphosis.Pass through the ground that remaining pipeline penetrates through in traveling ignitron to coal seam in gasification furnace gas injecting pipe Side.The temperature change of pipeline and coal combustion is monitored by the drilling of arrangement temperature monitoring.Between being arranged in gas injection channel Every mobile gas injection pipeline, enables the rollback gas injection with the displacement of flame face of gasifying agent decanting point, have it preferably Combustion System effect.The present invention devise a kind of distributed note exhaust passage narrow strips coal underground gasifying furnace production system and Technique, the production requirement that controllable and efficient stable produces gas can be led by meeting underground coal gasification(UCG).

Embodiment:

Distributed note exhaust passage narrow strips coal underground gasifying furnace provided in an embodiment of the present invention is (logical with three gas injections Road, for two exhaust passage arrangements).Such as Fig. 1 and Fig. 3-8, which includes three be arranged in coal seam 5 1, two, gas injection channel exhaust passage 2 and four temperature monitoring drillings 3.The gas injection channel 1 and exhaust passage 2 are from gasification The directional drilling channel that seat earth rock lane (i.e. ventilation pedestrian lane 4) is crept into towards coal seam 5, including gasification furnace outside rock water Coal seam section in flat section (1-1,2-1) and rock bending section (1-2,2-2) and gasification furnace.The coal seam section in gasification furnace, the note Gas channel 1 and exhaust passage 2 be along seat earth driving coal bed drilling channel, tunneling direction be along coal seam tendency on toward Under.The coal seam section in gasification furnace, gas injection channel 1 are tunneled along coal seam tendency straight line and reach design length.Exhaust passage 2 is parallel to Gas injection channel 1 is curved towards 1 distal point of gas injection channel when close to 1 distal point of gas injection channel is reached along coal seam tendency straight line driving Song driving, and be connected to the distal point in gas injection channel 1, the note exhaust passage of a perforation is formed in coal seam.The gas injection is logical Two gas injection pipelines of three gas injection pipelines and exhaust passage 2 in road 1 parallel spacing edged circle drilling extension width be Width is adopted in the design of gasification furnace, and the length in coal seam section gas injection channel 1 is the design length of gasification furnace in gasification furnace, and gasification furnace is adopted Width is smaller relative to the lenth ratio of gasification furnace, is a narrow strips furnace.

In the present embodiment, gasification furnace design adopt wide design considerations be gasification furnace adopt the wide limit for being less than coal seam overlying strata across Away from.It is distributed according to surrouding rock stress under the geological structure in gasification coal seam and occurrence condition, the physical and mechanical parameter of overlying strata, Thermal-mechanical Coupling And movement distortion rule is calculated again after the limited span of overlying strata, it is contemplated that the influence in temperature field and two sides border extension, A safety coefficient k is drafted, the limited span of overlying strata is that width is adopted in gasification furnace design divided by safety coefficient k.The present embodiment will Gasification furnace design adopts width and is designed as≤30m, and the spacing in distributed gas injection channel is 10m, the design length of gasification furnace 300~ 600m, gasification furnace length-width ratio is between 10:1~20:1.

The temperature monitoring drilling 3 is located at 2 middle position of gas injection channel 1 and exhaust passage, is parallel to gas injection channel 1 and row Gas channel 2 is crept into, until roof coal petrography intersection stops behind exposure coal seam.Roof coal petrography in the drilling has a common boundary 43 temperature thermocouples 6 are arranged in parallel in point, seat earth coal petrography point of interface and close ventilation pedestrian lane wall surface position, monitor respectively The temperature value of 43 positions.

Channel pillar 12, the channel pillar are disposed in the gas injection channel 1 of coal seam section and exhaust passage 2 in gasification furnace 12 be screen casing, and surface layout has a certain size circular hole, and the channel pillar 12 not only plays support gas injection channel 1 and exhaust is logical The effect of 2 coal wall of road, circular hole also help that gasifying agent is diffused into flame face and coal gas is pooled to exhaust passage.In gas Change the rock horizontal segment and rock bending section outside furnace, the channel pillar in gas injection channel and exhaust passage is common steel tube.

Gas injection pipeline 13 is disposed in gas injection channel pillar 7, the gas injection pipeline 13 is logical as the conveying of gasifying agent Road.It is arranged in equal spacing with hot melten type elastomeric connector 11 on the gas injection pipeline 13, when flame face is moved to the hot melt When formula 11 position of elastomeric connector, under high temperature and certain time effect, the hot melten type elastomeric connector 11 is disconnected, in gas injection New gas injection port is formed on pipeline 13, injected gasifying agent is enable directly to be transported to flame face position with regard to near-earth, is guaranteed The stability of flame face reaction interface morphosis.With the continuation displacement of flame face, on gas injection pipeline 13 Hot melten type elastomeric connector 10 successively disconnect and form new gas injection port, thus the gas injection port on gas injection pipeline 13 is with flame work Make the displacement in face and retreat, reaches the control requirement of mobile gas injection.Two sections of adjacent gas injection pipelines 13 are in gasification furnace The outer rock bending section of coal seam section, gasification furnace and rock horizontal segment are linked together by snap-on-connector 10, in gasification furnace It is connect outside by flange bolt with the underground gas injection pipe road 8 in gasification furnace separate ventilation pedestrian lane.

Rock horizontal segment of the exhaust passage 2 outside gasification furnace is disposed with gas exhaust piping, the adjacent gas exhaust piping in both ends It is linked together by flange bolt, and is finally connect with the downhole air exhaust pipeline 7 in gasification furnace separate ventilation pedestrian lane.

In order to guarantee the isolation of gasification furnace inner space and gasification furnace external environment, supervised in gas injection channel, exhaust passage and temperature It surveys drilling rock section and carries out sealing of hole, fill high temperature resistant cement enclosed material.

It is described ventilation pedestrian lane 4 be arranged in gasification seat earth stone head, the horizontal absolute altitude in ventilation pedestrian lane 4 and The furnace upper end absolute altitude that gasifies is identical, and has certain horizontal distance with gasification furnace upper extreme point, with gasification coal seam have it is certain it is vertical away from From the security isolation of the horizontal distance and the certifiable ventilation pedestrian lane and gasification furnace heated effluent field of vertical range.The ventilation Pedestrian lane 4 is the construction tunnel in gas injection channel 1, exhaust passage 2 and temperature monitoring drilling 3, is divulged information in pedestrian lane 4 using being arranged in Directional drilling machine horizontally toward directional drilling is tunneled in coal seam, be bent and creep by certain curvature when closing on seat earth, into coal seam Afterwards, coal seam gas injection channel 1 and exhaust passage 2 along seat earth driving gasification furnace.Underground is equipped in the ventilation pedestrian lane 4 Gas injection pipeline 8, gas exhaust piping 7, filling and injecting slurry pipeline 9.The ventilation pedestrian lane 4 is artificial simultaneously and during gasifier operation Lane is operated, transport and ventilation meet equipment conveying, drilling construction, Gas, the carbon dioxide of existing coal mining in tunnel Gush out, personnel breathing etc. require.

As shown in Fig. 2, a kind of coal underground gasifying technology realized by above-mentioned gasification system.It specifically includes:

(1) coal seam is lighted a fire in gasification furnace.13 expert of gas injection pipeline in underground ventilating pedestrian lane 4, in gas injection channel 1 Into ignitron to gas injection channel end ignition point position, high heating value fuel gas and oxygen are inputted by ignitron, before ignitron End has electronic lighter to light fuel gas, and the coal seam of ignition point position is ignited, and completes coal seam igniting in gasification furnace.

(2) gasifying agent injection and formation gasification tunnel.After coal seam is ignited, ignitron exits gas injection channel 1, at this time through ground Gas injection pipeline 13 inputs gas in gas injection pipeline → gas injection channel in gasifying agent preparation station → ground injecting gas pipeline → ventilation pedestrian lane Agent (including air, oxygen, vapor and its mixing) to ignition point position continues that coal combustion is made to gasify.Combustion gasification position It sets and is gradually extended by gas injection channel 1 and 2 tie point of exhaust passage, between distributed gas injection channel 1 and distributed exhaust passage 2 Gasification tunnel is formed, namely forms flame face.

(3) flame face retreats mobile and gas injection point and retracts.Gasification furnace during normal operation, flame face is by edge The length direction of band gasification furnace retreat movement, the hot melten type elasticity being equally spaced on gas injection pipeline 13 in gas injection channel 1 Connector 11 will successively be in flame face position, under high temperature action near flame face, hot melten type elastomeric connector 11 successively disconnect, and new gas injection port is sequentially formed in air injection pipe 13, are continued to provide gas to flame face by new gas injection port Agent.To make gasifying agent decanting point be spaced and retract as the retrogressing of flame face is mobile, guarantee gasification gas stream in the stove shape Smooth and flame face reaction interface morphosis the stabilization of state.

(4) row of coal gas is defeated.The coal gas produced in gasification furnace through flame face → 2 → gas exhaust piping of exhaust passage 14 → Pedestrian lane inside exhaust pipe road → exhaust wellbore tubing → ground gas exhaust piping of divulging information reaches ground coal gas gas point.

(5) temperature monitoring and gasification furnace are out of service.The temperature of temperature point in real-time monitoring temperature monitoring drilling 3 Value, when the temperature value of roof coal petrography point of interface and seat earth coal petrography point of interface successively reaches close to flame face height When warm (800~1000 DEG C), it is believed that flame face has reached gasification furnace the position of terminal mining line, stops at this time into gasification furnace It injects oxygen (or air), is changed to injection vapor, keeps gasification furnace out of service.When roof coal petrography point of interface and coal seam bottom When the temperature value of plate coal petrography point of interface is reduced to 100 DEG C or less, and monitor that the gas component CO concentration of discharge is reduced to zero When, then gasification furnace extinguishes completely.

(6) gasification furnace fills.After gasification furnace is out of service, pumping plant → ground filling piping → filling drilling well is filled through ground Pipeline → ventilation pedestrian entry-in packing pipeline → gasification furnace gas injection pipeline 13 will fill slurry and be transported to gasification furnace burned out area, and by Gradually it is full of entire gasification furnace burned out area.

The present invention provides a kind of distributed note exhaust passage narrow strips coal underground gasifying furnace production systems, by coal Gas injection channel in layer floor rock lane towards a plurality of parallel gas injection drilled tunnel of drilling in coal as gasification furnace is crept into a plurality of flat Exhaust passage of the row exhaust drilled tunnel as gasification furnace, a plurality of parallel gas injection channel is arranged in seat earth position, a plurality of flat Row exhaust passage is arranged in roof 1/3 position (i.e. 2/3 height and position of coal seam thickness) once.All gas injection channel drillings It is run through a bit with exhaust passage boring end, i.e. ignition point position.Thus distributed note exhaust passage gasification furnace has been constructed.This Invention also proposed the design of narrow strips gasification furnace adopt wide and distributed gas injection channel and exhaust passage to lay determination of amount former Then, it may be assumed that (1) the total linear spacing width of all gas injections or exhaust passage is gas plus the extension width in two gas injection channels of outermost Change the design width of furnace, the pole which should be less than multiplied by certain safety coefficient k or directly push up equal to coal seam or push up always Limit span.(2) single gas injection channel has certain horizontal extension width in underground gasification process, and two adjacent gas injections are logical The reasonable spacing in road should be equal to a horizontal extension width value.According to the two principles, it can determine and adopt width in certain gasification furnace Under reasonably gas injection number of channels.(3) quantity of exhaust passage subtracts one on the basis of gas injection number of channels.

Distributed note exhaust passage narrow strips underground gasification furnace provided by the invention in igniting or operating procedure, passes through Intermediate one ignitron for advancing in the gas injection channel of igniting realizes the igniting of gasification furnace coal seam.After the igniting of coal seam, pass through Distributed gas injection channel provides multicomponent gasifying agent (including oxygen, air, vapor and combinations thereof) in gasification furnace, is being distributed Coal body between formula gas injection channel and exhaust passage forms gasification reaction interface, and transform into fuel gas (carbon monoxide, Hydrogen, methane) based on coal gas.Distributed note exhaust passage of the invention is arranged in bottom, and coal of not keeping on file improves coal seam benefit With rate.Distributed exhaust passage is arranged in about 1/3 position of coal seam top or less, and the channel for transmitting coal gas is entirely disposed in coal body Interior, coal gas of high temperature and coal wall heat convection have the function that pre- thermal reaction area coal body, help to reduce heat loss in gasification furnace, mention The hot working efficiency of high gasification furnace entirety.By in gasification furnace air injection pipe road hot melten type elastic connecting device realize gas injection point with The displacement of flame face and be spaced mobile gas injection, make to form stable gas in gasification furnace by being spaced mobile gas injection control The reaction interface morphosis of stream mode and stable state.Judge that gasification furnace is by the electric thermo-couple temperature value of temperature monitoring drilling arrangement It is no to reach the position of terminal mining line, and carry out gasification furnace shutoff operation.Delay filling is carried out to gasification furnace burned out area using filling system, Filling not only has good CONTROL OF STRATA MOVEMENT effect, can also be fixedly arranged at burned out area remaining pollution in filling slurry.This point Cloth infuses exhaust passage narrow strips gasification furnace production system and technique, and high seam and super high seam gasification stove can be made for good CONTROL OF STRATA MOVEMENT, mobile gas injection control and pollution control effect, do not destroy the complete structure of overlying strata, not polluted underground water, maximum journey Degree realizes the ecological ideas exploitation and innoxious exploitation of coal.

The present invention carries out drilling using mine coal seam floor rock tunnel and builds furnace construction and gasifier operation operation, both reduces Interference and destruction to gasification zone coal seam, ensure that the airtightness in gasification furnace, and reduce gasification furnace building cost, mentions High gasification furnace building efficiency.

In embodiments of the present invention, Fig. 3 is distributed note exhaust passage narrow strips coal provided in an embodiment of the present invention Lower gasification furnace production system A-A sectional view.

Fig. 4 is distributed note exhaust passage narrow strips coal underground gasifying furnace production system B- provided in an embodiment of the present invention B sectional view.

When Fig. 5 is that distributed note exhaust passage narrow strips coal underground gasifying furnace provided in an embodiment of the present invention operates normally Phase sectional view.

Fig. 6 is distributed note exhaust passage narrow strips coal underground gasifying furnace normal system C- provided in an embodiment of the present invention C sectional view.

Fig. 7 is distributed note exhaust passage narrow strips coal underground gasifying furnace normal system D- provided in an embodiment of the present invention D sectional view.

Fig. 8 is distributed note exhaust passage narrow strips coal underground gasifying furnace note exhaust system provided in an embodiment of the present invention Distribution map.

Below with reference to effect, the invention will be further described.

The purpose of the present invention is to provide a kind of strip-types to infuse exhaust passage coal underground gasifying furnace production system and technique, Primarily directed to high seam and super high seam condition, provide it is a kind of be adapted with geological environment and condition of coal seam occurrence, have The coal underground gasifying furnace production system and technique of controllable function can be led.The geological structure and occurrence condition in solution gasification coal seam, It is logical to establish a kind of band note exhaust for surrouding rock stress distribution and movement distortion rule under the physical and mechanical parameters of overlying strata, Thermal-mechanical Coupling Road coal underground gasifying furnace makes it have preferable Surrounding Rock Control effect.Pass through Reasonable Arrangement distribution gas injection channel and distribution Formula exhaust passage makes to form smoothly air flow condition and reasonable gasification reaction interface configuration structure in gasification furnace.Pass through gas injection Mobile gas injection device is arranged in channel, is enable the control that retracts with the displacement of flame face of gasifying agent decanting point, is made it Has preferable Combustion System effect.Present invention accomplishes high seams and super high seam underground gasification can lead controllable and efficient stable Produce the production requirement of gas.

The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.

Claims (10)

1. a kind of distributed note exhaust passage narrow strips coal underground gasifying furnace production method, which is characterized in that the distribution Infusing exhaust passage narrow strips coal underground gasifying furnace production method includes:

Step 1, coal seam igniting in gasification furnace；

Step 2, gasifying agent injection and formation gasification tunnel；

Step 3, flame face retreat mobile and gas injection point and retract；

The row of step 4, coal gas is defeated；

Step 5, temperature monitoring are out of service with gasification furnace；

Step 6, gasification furnace filling.

2. distributed note exhaust passage narrow strips coal underground gasifying furnace production method as described in claim 1, which is characterized in that Coal seam, which is lighted a fire, in the gasification furnace of the step 1 includes:

In underground ventilating pedestrian lane, gas injection pipeline expert in gas injection channel is into ignitron to gas injection channel end ignition point Position inputs high heating value fuel gas and oxygen by ignitron, lights fuel gas by the electronic lighter of ignitron front end, The coal seam of ignition point position is ignited, coal seam igniting in gasification furnace is completed.

3. distributed note exhaust passage narrow strips coal underground gasifying furnace production method as described in claim 1, which is characterized in that The gasifying agent of the step 2 injects and is formed gasification tunnel

After coal seam is ignited, ignitron exits gas injection channel, prepares station, ground injecting gas pipeline, gas injection well casing through ground gasifying agent Gas injection pipeline in road, ventilation pedestrian lane, gas injection pipeline input gasifying agent continues to make coal combustion to ignition location in gas injection channel Gasification；Combustion gasification position is gradually extended by gas injection channel and exhaust passage tie point, between gas injection channel and exhaust passage Gasification reaction interface is formed, flame face is formed.

4. distributed note exhaust passage narrow strips coal underground gasifying furnace production method as described in claim 1, which is characterized in that The flame face of the step 3 retreats mobile retract with gas injection point

Flame face will be moved along the retrogressing of the length direction of narrow strips gasification furnace, and air injection pipe road is equidistant in gas injection channel The hot melten type elastomeric connector of arrangement will successively be in flame face position, under high temperature action near flame face, heat Molten formula elastomeric connector successively disconnects, and new gas injection port is sequentially formed on air injection pipe road, is continued by new gas injection port to flame Working face provides gasifying agent；Gasifying agent decanting point is set to be spaced and retract as the retrogressing of flame face is mobile.

5. distributed note exhaust passage narrow strips coal underground gasifying furnace production method as described in claim 1, which is characterized in that The row of the coal gas of the step 4 is defeated to include:

The coal gas produced in gasification furnace is through flame face, exhaust passage, gas exhaust piping, ventilation pedestrian lane inside exhaust pipe road, row Gas wellbore tubing, ground gas exhaust piping reach ground coal gas gas point.

6. distributed note exhaust passage narrow strips coal underground gasifying furnace production method as described in claim 1, which is characterized in that The temperature monitoring of the step 5 is out of service with gasification furnace to include:

The temperature value of real-time monitoring temperature monitoring temperature in drill hole measuring point, when roof coal petrography point of interface, seat earth coal petrography When the temperature value of point of interface reaches close to 800~1000 DEG C of flame face high temperature, flame face reaches gasification furnace and stops adopting Line position stops injecting oxygen or air into gasification furnace, is changed to injection vapor, keeps gasification furnace out of service；When coal seam is pushed up When the temperature value of plate coal petrography point of interface and seat earth coal petrography point of interface is reduced to 100 DEG C or less, and monitor the gas of discharge When body component CO concentration is reduced to zero, then gasification furnace extinguishes completely.

7. distributed note exhaust passage narrow strips coal underground gasifying furnace production method as described in claim 1, which is characterized in that The gasification furnace of the step 6 fills

After gasification furnace is out of service, filled in pedestrian lane through ground filling pumping plant, ground filling piping, filling wellbore tubing, ventilation It fills out pipeline, gasification furnace gas injection pipeline and is transported to gasification furnace burned out area for slurry is filled, and be gradually filled with entire gasification furnace burned out area.

8. a kind of distribution for implementing the note exhaust passage narrow strips coal underground gasifying furnace production method of distribution described in claim 1 Formula infuses exhaust passage narrow strips coal underground gasifying furnace production system, which is characterized in that the distributed note exhaust passage fillet Include: with coal underground gasifying furnace production system

The a plurality of parallel exhaust passage that a plurality of parallel gas injection channel near bottom is set, coal seam near top is set It drills with a plurality of temperature monitoring；

The gas injection channel and exhaust passage are from gasification seat earth ventilation directional drilling of the pedestrian lane towards drilling in coal Channel, including gasification furnace outside rock horizontal segment and rock bending section and gasification furnace in coal seam section；

The coal seam section in gasification furnace, the gas injection channel are along the coal bed drilling channel that bottom tunnels, and tunneling direction is edge Coal seam tendency is downward；

The exhaust passage is along the coal bed drilling channel close to coal seam top driving, and tunneling direction is downward along coal seam tendency；

The coal seam section in gasification furnace, gas injection channel is along coal seam tendency straight line driving, close to when reaching design length, except for lighting a fire Outside the gas injection channel of function, other a plurality of gas injection channels are bent driving towards the ignition point of ignition channel, and run through a bit；

Exhaust passage and gas injection channel are spatially parallel, towards gas injection channel end when close to gas injection channel end point is reached Point bending driving, and be connected to the breakthrough point in gas injection channel, all gas injection channels and exhaust passage are run through in coal seam Ignition point position；

Temperature monitoring drilling is located at gas injection channel and exhaust passage drilling middle position, is parallel to gas injection channel and row in rock section Gas channel is crept into, until roof coal petrography intersection stops behind exposure coal seam；

The interposition at roof coal petrography intersection, seat earth coal petrography intersection and ventilation pedestrian lane wall surface in drilling It sets and is respectively arranged temperature thermocouple, monitor the temperature value of position, thermocouple lead is drilled by temperature monitoring and drawn, connection temperature Spend monitoring system；

It is disposed with channel pillar in the gas injection channel of coal seam section and exhaust passage in gasification furnace, the channel pillar is screen casing, Surface layout has a certain size circular hole, and the channel pillar is used to support gas injection channel and exhaust passage coal wall；

Gas injection pipeline, transfer passage of the gas injection pipeline as gasifying agent are disposed in the pillar of gas injection channel.

9. distributed note exhaust passage narrow strips coal underground gasifying furnace production system as claimed in claim 8, feature exist In the air injection pipe road is arranged in equal spacing with hot melten type elastomeric connector, when flame face is moved to the hot melten type bullet Property connector position when, under high temperature and certain time effect, the hot melten type elastomeric connector is disconnected, the shape on air injection pipe road The gas injection port of Cheng Xin enables injected gasifying agent to be directly transported to flame face position with regard to near-earth；

With the continuation displacement of flame face, the hot melten type elastomeric connector of air injection pipe road, which successively disconnects, to be formed newly The gas injection port of gas injection port, air injection pipe road is retreated with the displacement of flame face；

Two sections of adjacent gas injection pipelines in gasification furnace coal seam section, rock bending section and rock horizontal segment pass through card outside gasification furnace Snap connectors link together, and pass through the underground gas injection pipe in flange bolt and gasification furnace separate ventilation pedestrian lane outside gasification furnace Road connection.

10. distributed note exhaust passage narrow strips coal underground gasifying furnace production system as claimed in claim 8, feature exist In,

Rock horizontal segment of the exhaust passage outside gasification furnace is disposed with gas exhaust piping, and the adjacent gas exhaust piping in both ends passes through method Orchid is bolted together, and finally with the downhole air exhaust piping connection in gasification furnace separate ventilation pedestrian lane；

Sealing of hole is carried out in gas injection channel, exhaust passage and temperature monitoring drilling rock section, filling high temperature resistant cement, high temperature resistant are organic Or thermal insulation inorganic material progress is closed；

The ventilation pedestrian lane is the stone head for being arranged in gasification seat earth, is divulged information on the horizontal absolute altitude in pedestrian lane and gasification furnace It holds absolute altitude identical, and has certain horizontal distance with gasification furnace upper extreme point, have certain vertical range with gasification coal seam；

The ventilation pedestrian lane is the construction tunnel in gas injection channel, exhaust passage and temperature monitoring drilling, is divulged information using being arranged in Horizontally toward directional drilling is tunneled in coal seam to directional drilling machine in pedestrian lane, is bent and creeps by certain curvature when closing on seat earth, Into after coal seam, coal seam gas injection channel along gasification furnace is tunneled along seat earth, is that the 2/3 of coal seam height is high below the top of coal seam Spend the coal seam exhaust passage in the driving gasification furnace of position；

Underground gas injection pipe road, gas exhaust piping, filling and injecting slurry pipeline are equipped in the ventilation pedestrian lane；

It is described ventilation pedestrian lane be also used to gasifier operation during manual operation；

The vertical gas injection drilling well in ground is connected with underground ventilating pedestrian lane, is equipped with pipeline in gas injection drilling well, and with underground ventilating row Gas injection pipeline in people lane is connected with auxiliary gas injection pipeline, is gas injection pipeline and auxiliary gas injection pipeline in underground ventilating pedestrian lane Gasifying agent is provided；

The vertical filling drilling well in ground is connected with underground ventilating pedestrian lane, filling drilling well in be equipped with pipeline, and with underground ventilating row Filling piping in people lane is connected, and provides filling slurry for the filling piping in underground ventilating pedestrian lane；

The vertical exhaust drilling well in ground is connected with underground ventilating pedestrian lane, exhaust drilling well in be equipped with pipeline, and with underground ventilating row Downhole air exhaust pipeline in people lane is connected, and the coal gas in the downhole air exhaust pipeline divulged information in pedestrian lane is transported to ground gas pipe Lu Zhong.