CN107178355A - Underground coal gasification system and its construction method - Google Patents
Underground coal gasification system and its construction method Download PDFInfo
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- CN107178355A CN107178355A CN201710575435.2A CN201710575435A CN107178355A CN 107178355 A CN107178355 A CN 107178355A CN 201710575435 A CN201710575435 A CN 201710575435A CN 107178355 A CN107178355 A CN 107178355A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention provides a kind of underground coal gasification system and its construction method.Wherein, the system includes：Gasification furnace and water-stop structure；Wherein, gasification furnace is arranged in gasification coal seam, the raw coal in coal seam of gasifying is converted into coal gas through gasification reaction；Water-stop structure is arranged on the periphery in gasification coal seam, so that the moisture around gasification coal seam is isolated with gasification coal seam.The periphery in the gasification coal seam in the present invention is provided with water-stop structure, and then prevent underground water to be poured in from water-bearing layer in gasification coal seam, so as to which the heat avoided in gasification furnace is relatively low by the temperature of gasification face caused by groundwater depletion, it ensure that being normally carried out for subterranean coal gasification, meanwhile, the pollutant that water-stop structure is also possible to prevent gasification generation is diffused into underground and is diffused into the stratum of coal seam surrounding.In addition, coal gas and heat that water-stop structure is also prevented from producing in gasification coal seam in gasification spread to surrounding stratum, and then it ensure that the gasification rate in the amount for producing coal gas and coal seam.
Description
Technical field
The present invention relates to coal gasification field, in particular to a kind of underground coal gasification system and its structure
Method.
Background technology
For the abundant underground water contained in the surrounding stratum in coal seam, when using coal underground gasification technology come
When exploiting the coal seam, underground water can be poured in constantly in gasification furnace, also, in underground water undergoes a series of phase transition process, gas
The heat changed in stove will be by groundwater depletion, and then causes the temperature of gasification face relatively low so that underground gasification process can not
Normal operation；Even if in addition, the water yield of underground water is smaller, influenceing little to the gasification in coal seam, but in gasification
The pollutant of generation can be diffused into underground water, and is diffused into the flowing of underground water in the stratum of coal seam surrounding, and then is made
Pollution range is obtained constantly to expand.Therefore, when coal seam surrounding has underground water, no matter the size of its water yield, enter to coal seam
During promoting the circulation of qi, underground water all can produce influence to gasification.
The content of the invention
In consideration of it, the present invention proposes a kind of underground coal gasification system and its construction method, it is intended to solve underground swelling
Entering gasification caused by gasification furnace can not be normally carried out and the problem of pollutant spreads.
On one side, the present invention proposes a kind of underground coal gasification system.The system includes：Gasification furnace and water proof knot
Structure；Wherein, gasification furnace is arranged in gasification coal seam, the raw coal in coal seam of gasifying is converted into coal gas through gasification reaction；Water proof
Structure setting is in the periphery in gasification coal seam, so that the moisture around gasification coal seam is isolated with gasification coal seam.
Further, in above-mentioned underground coal gasification system, water-stop structure includes：At least one is set along gasification coal seam periphery
Collar aperture；Rock mass in each hole and around gasification coal seam and/or in the space of soil layer filled with water proof medium.
Further, in above-mentioned underground coal gasification system, water proof medium is cement mortar or mud clay.
Further, in above-mentioned underground coal gasification system, circumference of each hole along gasification coal seam is uniformly arranged.
Further, in above-mentioned underground coal gasification system, each Kong Jun is enclosed located at gasification coal seam using coal seam of gasifying as the center of circle
Periphery.
Further, in above-mentioned underground coal gasification system, each hole is upright opening.
The periphery in gasification coal seam is provided with water-stop structure in the present invention, and then prevents underground water to pour in gasification from water-bearing layer
In coal seam, so that the heat avoided in gasification furnace is relatively low by the temperature of gasification face caused by groundwater depletion, it is ensured that
Being normally carried out of subterranean coal gasification, meanwhile, water-stop structure is also possible to prevent the pollutant diffusion of gasification generation
It is diffused into underground in the stratum of coal seam surrounding.
Especially, water-stop structure of the invention is to be set along gasification coal seam periphery in an at least collar aperture, each hole and gasification of coal
Water proof medium is filled with the rock mass of layer surrounding and/or the space of soil layer；By water proof medium by where water-bearing layer and gasification furnace
Zone isolation.
Further, water-stop structure of the invention is also prevented from coal gas and the heat produced in gasification in gasification coal seam
Measure and spread to surrounding stratum, and then ensure that gasification produces the amount of coal gas and the gasification rate in coal seam.
On the other hand, the invention also provides a kind of construction method of underground coal gasification system.This method includes as follows
Step：Construction step, builds the gasification the raw coal in coal seam of gasifying to be converted into coal gas through gasification reaction in gasification coal seam
Stove；Setting steps, the water proof to make the moisture around gasification of coal layer isolate with gasification coal seam is set in the periphery in gasification coal seam
Structure.
Further, in the construction method of above-mentioned underground coal gasification system, setting steps include：First is drilled with sub-step
Suddenly, multiple upright openings to constitute water-stop structure are drilled with along the circumference in gasification coal seam；Filling sets sub-step, is filled out into each upright opening
Fill water proof medium；Pressurization sub-step, pressure is applied to the water proof medium in each upright opening, so that water proof medium penetrates into gasification coal seam
In the rock mass of surrounding and/or the space of soil layer.
Further, in the construction method of above-mentioned underground coal gasification system, also include after setting steps：Cleaning step
Suddenly, after the completion of gasification coal seam gasification, the pollutant in gasification furnace is cleared up.
Further, in the construction method of above-mentioned underground coal gasification system, cleanup step includes：Second is drilled with sub-step
Suddenly, drilling is drilled with water-stop structure, so that gasification coal seam is connected with water-bearing layer；Sub-step is rinsed, by the water in water-bearing layer
It is introduced into gasification furnace, to be rinsed to gasification furnace；Draw water sub-step, the water in gasification furnace is extracted out；Seal sub-step, to every
The drilling being drilled with water-bound is sealed.
The periphery in gasification coal seam is provided with water-stop structure in the present invention, and then prevents underground water to pour in gasification from water-bearing layer
In coal seam, so that the heat avoided in gasification furnace is relatively low by the temperature of gasification face caused by groundwater depletion, it is ensured that
Being normally carried out of subterranean coal gasification, meanwhile, water-stop structure is also possible to prevent the pollutant diffusion of gasification generation
It is diffused into underground in the stratum of coal seam surrounding.
Especially, water-stop structure of the invention is to be set along gasification coal seam periphery in an at least collar aperture, each hole and gasification of coal
Water proof medium is filled with the rock mass of layer surrounding and/or the space of soil layer；By water proof medium by where water-bearing layer and gasification furnace
Zone isolation.
Further, water-stop structure of the invention is also prevented from coal gas and the heat produced in gasification in gasification coal seam
Measure and spread to surrounding stratum, and then ensure that gasification produces the amount of coal gas and the gasification rate in coal seam.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Fig. 1 is the structural representation of underground coal gasification system provided in an embodiment of the present invention；
Fig. 2 is the flow chart of the construction method of underground coal gasification system provided in an embodiment of the present invention；
Fig. 3 for underground coal gasification system provided in an embodiment of the present invention construction method in, the flow chart of setting steps；
Fig. 4 is the another flow chart of the construction method of underground coal gasification system provided in an embodiment of the present invention；
Fig. 5 for underground coal gasification system provided in an embodiment of the present invention construction method in, the flow chart of cleanup step.
Embodiment
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in accompanying drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
Limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
Complete conveys to those skilled in the art.It should be noted that in the case where not conflicting, embodiment in the present invention and
Feature in embodiment can be mutually combined.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
System embodiment：
Referring to Fig. 1, the preferred structure for the underground coal gasification system that the present embodiment is provided is shown in figure.As illustrated,
The system includes：Gasification furnace 1 and water-stop structure 3.
Wherein, gasification furnace 1 is arranged in gasification coal seam 2, and then gasification coal seam 2 is gasified with the coal seam 2 that will gasify
Raw coal be converted into coal gas.It will be appreciated by those skilled in the art that for gasification furnace 1, including at least one air admission hole 11 and extremely
A few venthole 12, air admission hole 11 and venthole 12 are drilled with gasification coal seam 2, the bottom of air admission hole 11 and venthole 12
Connect, to form gasification tunnel 13.
Water-stop structure 3 be arranged on gasification coal seam 2 periphery, and then by gasify coal seam 2 around water-bearing layer moisture and gas
Change coal seam 2 to be isolated.It should be noted that the water proof effect of water-stop structure 3 needs to permit when less than gasification coal seam 2 being gasified
Perhaps water yield, for example, water-stop structure 3 can make the water yield in gasification of coal layer 2 be less than 8~14.5L/h.
In the present embodiment, the periphery in gasification coal seam 2 is provided with water-stop structure 3, and then prevents underground water to be gushed from water-bearing layer
Enter to gasify in coal seam 2, so that the heat avoided in gasification furnace 1 is inclined by the temperature of gasification face caused by groundwater depletion
It is low, it is ensured that subterranean coal gasification is normally carried out, meanwhile, water-stop structure 3 is also possible to prevent the dirt of gasification generation
Dye thing is diffused into underground and is diffused into the stratum of coal seam surrounding.In addition, water-stop structure 3 is also prevented from gasifying in gasification
The coal gas and heat produced in coal seam 2 spreads to surrounding stratum, and then ensure that the collection capacity of coal gas and the gasification rate in coal seam.
In above-described embodiment, water-stop structure 3 can be set using Heavy Curtain Grouting Technology, i.e., along the periphery in gasification coal seam 2
The space of at least one rock mass enclosed around upright opening 31, each upright opening 31 and gasification coal seam 2 is set to be filled with water proof medium,
Or water proof medium is filled with the space of the soil layer around each upright opening 31 and gasification coal seam 2, and then in gasification coal seam 2
Periphery form multilayer and block water curtain, entered to gasify in coal seam 2 with the swelling for preventing water-bearing layer, i.e., by water proof medium by water-bearing layer with
Zone isolation where gasification furnace 1.When it is implemented, water proof medium can be cement mortar, mud clay or chemical grouting material.
Spacing between the quantity and each upright opening 31 of the upright opening 31 often enclosed can be according to the gasification surrounding rock mass of coal seam 2 and/or soil layer
Crack, the situation of hole determine that the present embodiment do not do any restriction to it.
In above-described embodiment, each circle upright opening 31 is the center of circle with coal seam 2 of gasifying, with different radiuses, in a ring uniformly
Ground is arranged at the surrounding in gasification coal seam 2, to play the water proof effect of maximum.When it is implemented, between respectively enclosing between upright opening 31
Away from can be determined according to gasification coal seam 2 surrounding rock mass and/or the crack of soil layer, the situation of hole, the present embodiment to it not
Do any restriction.
To sum up, the periphery in gasification coal seam is provided with water-stop structure in the present embodiment, and then prevents underground water from water-bearing layer
Pour in gasification coal seam, so that the heat avoided in gasification furnace is inclined by the temperature of gasification face caused by groundwater depletion
It is low, it is ensured that subterranean coal gasification is normally carried out, meanwhile, water-stop structure is also possible to prevent the pollution of gasification generation
Thing is diffused into underground and is diffused into the stratum of coal seam surrounding.Further, water-stop structure of the invention is also prevented from gasification
During in gasification coal seam the coal gas that produces and heat spread to surrounding stratum, and then ensure that gasification produces the amount and coal of coal gas
The gasification rate of layer.
The construction method of system：
Referring to Fig. 2, the flow chart of the construction method for the underground coal gasification system that Fig. 2 provides for the present embodiment.As schemed
Show, this method comprises the following steps：
Construction step S210, builds in gasification coal seam the raw coal in coal seam of gasifying is converted into coal gas through gasification reaction
Gasification furnace.
Specifically, gasification furnace 1 is built in gasification coal seam 2, and then gasification coal seam 2 is gasified with the coal seam that will gasify
Raw coal in 2 is converted into coal gas.It will be appreciated by those skilled in the art that for gasification furnace 1, including at least one air admission hole 11
With at least one venthole 12, air admission hole 11 and venthole 12 are drilled with gasification coal seam 2, air admission hole 11 and venthole 12
Bottom connects, to form gasification tunnel 13.
Setting steps S220, gasification coal seam periphery set to make gasification of coal layer around moisture with gasify coal seam every
From water-stop structure.
Specifically, water-stop structure 3 is set in the periphery in gasification coal seam 2, and water-stop structure 3 can be by around gasification coal seam 2
Water-bearing layer moisture with gasification coal seam 2 be isolated.It should be noted that the water proof effect of water-stop structure 3 is needed less than gasification
The water yield allowed when coal seam is gasified, for example, water-stop structure 3 can make gasification of coal layer 2 in water yield be less than 8~
14.5L/h。
Gasify in the present embodiment, in the present embodiment periphery in coal seam is provided with water-stop structure, so prevent underground water from
Water-bearing layer is poured in gasification coal seam, so as to avoid heat in gasification furnace by gasification face caused by groundwater depletion
Temperature is relatively low, it is ensured that subterranean coal gasification is normally carried out, meanwhile, water-stop structure is also possible to prevent gasification generation
Pollutant be diffused into underground and be diffused into the stratum of coal seam surrounding.Further, water-stop structure of the invention can also be prevented
The coal gas and heat only produced in gasification in gasification coal seam spreads to surrounding stratum, and then ensure that gasification produces coal gas
Amount and the gasification rate in coal seam.
Referring to Fig. 3, in one embodiment of the invention, setting steps S220 can include：
First is drilled with sub-step S221, and multiple upright openings to constitute water-stop structure are drilled with along the circumference in gasification coal seam.
Specifically, water-stop structure 3 includes multiple upright openings 31, is uniformly drilled with along the circumference in gasification coal seam 2 multiple vertical
Hole 31.When it is implemented, water-stop structure 3 can include at least one circle upright opening 31, each circle upright opening 31 can be with gasification of coal
Layer 2 is the center of circle, and with different radiuses, the surrounding in gasification coal seam 2 is evenly arranged in a ring.When it is implemented, that often encloses hangs down
The spacing between spacing and each circle upright opening 31 between the quantity of straight hole 31, each upright opening 31 can be according to gasification coal seam 2
The crack of surrounding rock mass and/or soil layer, the situation of hole determine that the present embodiment do not do any restriction to it.
Filling sets sub-step S222, and water proof medium is filled into each upright opening.
Specifically, water proof medium is filled into each upright opening 31, such as filling concrete mortar, mud clay or chemistry are filled
Pulp material.
Pressurizeed sub-step S223, and pressure is applied to the water proof medium in each upright opening, so that water proof medium penetrates into gasification of coal
In the rock mass of layer surrounding and/or the space of soil layer.
Specifically, pressure is applied to the water proof medium in each upright opening 31, so that water proof medium penetrates into gasification coal seam 2
Around rock mass and/or soil layer space in, and then form multilayer in the periphery in gasification coal seam 2 and block water curtain.
In the present embodiment, water-stop structure is to be set along gasification coal seam periphery in an at least collar aperture, each hole and gasification coal seam week
Water proof medium is filled with the rock mass enclosed and/or the space of soil layer, passes through area of the water proof medium by water-bearing layer and where gasification furnace
Domain separation, it is to avoid underground water is poured in gasification coal seam, it is ensured that coal seam gasification is normally carried out.
Referring to Fig. 4, the another flow of the construction method for the underground coal gasification system that the present embodiment is provided is shown in figure
Figure.As illustrated, this method comprises the following steps：
Construction step S410, builds in gasification coal seam the raw coal in coal seam of gasifying is converted into coal gas through gasification reaction
Gasification furnace.
Setting steps S420, gasification coal seam periphery set to make gasification of coal layer around moisture with gasify coal seam every
From water-stop structure.
After the completion of cleanup step S430, gasification coal seam gasification, the pollutant in gasification furnace is cleared up.
Specifically, after the completion of gasification coal seam 2 is gasified, pollutant can be left in gasification furnace 1, and then need to gasification furnace 1
Interior pollutant is cleared up.
In the present embodiment, the pollutant of gasification furnace is cleared up, it is therefore prevented that pollutant is diffused and polluted in underground
Sub-surface and underground water.
Referring to Fig. 5, in one embodiment of the invention, cleanup step S430 can include：
Second is drilled with sub-step S431, and drilling is drilled with water-stop structure, so that gasification coal seam is connected with water-bearing layer.
Specifically, directional drilling is drilled with water-stop structure 3, and then by the gasification coal seam 2 of the both sides of water-stop structure 3 and is contained
Water layer is connected.
Sub-step S432 is rinsed, the water in water-bearing layer is introduced into gasification furnace, to be rinsed to gasification furnace.
Specifically, because gasification coal seam 2 is connected with water-bearing layer, and then the water in water-bearing layer can be introduced gasification furnace
In 1, to be rinsed to the pollutant in gasification furnace 1.
Sub-step of drawing water S433, the water in gasification furnace is extracted out.
Specifically, to gasification furnace 1 rinse after the completion of, by venthole 12 of the water in gasification furnace 1 through gasification furnace 1 extract to
Ground.The water of extraction can carry out sewage disposal, to be recycled.
Sub-step S434 is sealed, the drilling being drilled with water-stop structure is sealed.
Specifically, the directional drilling being drilled with to water-stop structure 3 carries out slip casting sealing.
In the present embodiment, drilling is drilled with water-stop structure, by the gasification coal seam of water-stop structure both sides and water-bearing layer phase
Connection, and then directly gasification furnace is cleaned using the water in water-bearing layer, it is convenient and swift.After the completion of cleaning, by gasification furnace
Water extract out, and drilling is sealed, can prevent the pollutant of residual in gasification furnace diffuse in water-bearing layer and impurely
Lower water.
To sum up, the periphery in gasification coal seam is provided with water-stop structure in the present embodiment, and then prevents underground water from water-bearing layer
Pour in gasification coal seam, so that the heat avoided in gasification furnace is inclined by the temperature of gasification face caused by groundwater depletion
It is low, it is ensured that subterranean coal gasification is normally carried out, meanwhile, water-stop structure is also possible to prevent the pollution of gasification generation
Thing is diffused into underground and is diffused into the stratum of coal seam surrounding.Further, water-stop structure of the invention is also prevented from gasification
During in gasification coal seam the coal gas that produces and heat spread to surrounding stratum, and then ensure that gasification produces the amount and coal of coal gas
The gasification rate of layer.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (10)
1. a kind of underground coal gasification system, it is characterised in that including：
Gasification furnace (1), it is arranged in gasification coal seam (2), the raw coal of the gasification coal seam (2) to be converted through gasification reaction
For coal gas；
Water-stop structure (3), it is arranged on the periphery of the gasification coal seam (2) so that the gasification coal seam (2) around moisture with
Gasification coal seam (2) isolation.
2. underground coal gasification system according to claim 1, it is characterised in that the water-stop structure (3) includes：
Along the gasification coal seam (2) periphery, an at least collar aperture (31) is set；
Water proof medium is filled with each hole (31) and in the rock mass of the gasification coal seam (2) surrounding and/or the space of soil layer.
3. underground coal gasification system according to claim 2, it is characterised in that
The water proof medium is cement mortar or mud clay.
4. underground coal gasification system according to claim 2, it is characterised in that
Circumference of each hole (31) along the gasification coal seam (2) is uniformly arranged.
5. underground coal gasification system according to claim 2, it is characterised in that
Each hole (31) is that the center of circle is enclosed located at the periphery of the gasification coal seam (2) with the gasification coal seam (2).
6. the underground coal gasification system according to any one of claim 2 to 5, it is characterised in that
Each hole (31) is upright opening.
7. the construction method of underground coal gasification system any one of a kind of utilization claim 1 to 6, it is characterised in that
Comprise the following steps：
Construction step, builds the gas the raw coal in the gasification coal seam to be converted into coal gas through gasification reaction in gasification coal seam
Change stove；
Setting steps, are set to make the moisture around the gasification coal seam and the gasification of coal in the periphery in the gasification coal seam
The water-stop structure of layer isolation.
8. construction method according to claim 7, it is characterised in that the setting steps include：
First is drilled with sub-step, and multiple upright openings to constitute the water-stop structure are drilled with along the circumference in the gasification coal seam；
Filling sets sub-step, and water proof medium is filled into each upright opening；
Pressurization sub-step, pressure is applied to the water proof medium in each upright opening, so that the water proof medium penetrates into the gas
In the space for changing the rock mass and/or soil layer around coal seam.
9. construction method according to claim 7, it is characterised in that also include after the setting steps：
After the completion of cleanup step, the gasification coal seam gasification, the pollutant in the gasification furnace is cleared up.
10. construction method according to claim 9, it is characterised in that the cleanup step includes：
Second is drilled with sub-step, and drilling is drilled with the water-stop structure, so that the gasification coal seam is connected with water-bearing layer；
Sub-step is rinsed, the water in the water-bearing layer is introduced into the gasification furnace, to be rinsed to the gasification furnace；
Draw water sub-step, the water in the gasification furnace is extracted out；
Sub-step is sealed, the drilling being drilled with the water-stop structure is sealed.
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