CN111997612B - Deep mine geothermal energy and coal resource fluidization collaborative mining method - Google Patents
Deep mine geothermal energy and coal resource fluidization collaborative mining method Download PDFInfo
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- 238000005065 mining Methods 0.000 title claims abstract description 82
- 239000003245 coal Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005243 fluidization Methods 0.000 title claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000004146 energy storage Methods 0.000 claims abstract description 22
- 239000011435 rock Substances 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000002955 isolation Methods 0.000 claims abstract description 8
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 239000004568 cement Substances 0.000 claims abstract description 4
- 238000012544 monitoring process Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 5
- 238000005338 heat storage Methods 0.000 claims description 3
- 230000007774 longterm Effects 0.000 claims description 3
- 230000005641 tunneling Effects 0.000 claims description 3
- 239000010883 coal ash Substances 0.000 claims description 2
- 238000003809 water extraction Methods 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 3
- 239000010881 fly ash Substances 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/06—Filling-up mechanically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/20—Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention discloses a fluidized collaborative mining method for geothermal energy and coal resources of a deep mine, which comprises the steps of adopting a deep in-situ unmanned intelligent shield machine to carry out coal resource mining operation, and conveying mined coal powder to the ground surface in a fluidized manner through a screw conveyor and a pipeline system; mining a thin coal seam adjacent to a coal seam or a softer weak geothermal energy reservoir by using a deep in-situ unmanned intelligent shield machine by adopting a strip type, room-and-column type and other partial mining method to construct a geothermal energy storage space; after cementing materials such as fly ash and cement are added into the mined geothermal energy reservoir rock powder, the geothermal energy reservoir rock powder is fluidized and transmitted to a goaf of a coal seam working face through a pumping pipeline system to carry out filling operation; after the space of the geothermal energy reservoir is constructed, laying a cold water recharging and hot water extracting pipeline, constructing a regional isolation retaining wall, and forming a geothermal energy circulating exploitation system; thereby achieving the aim of fluidized and collaborative mining of the geothermal energy and the coal resources of the deep mine. The invention can realize the fluidized comprehensive development of deep mine resources and has wide application prospect.
Description
Technical Field
The invention belongs to the technical field of deep mine resource comprehensive development, and particularly relates to a deep mine geothermal energy and coal resource fluidization collaborative mining method.
Background
When the deep rock mass is basically in a three-way isobaric state, the deep rock mass enters a full-range plastic rheological state, rock stratum movement, surrounding rock supporting, disaster early warning and prevention and control and the like are difficult to control, and the existing mining mode of solid mineral resources is difficult to apply. The deep in-situ fluidization mining of coal is a fluidization mining technology which converts deep coal into gaseous, liquid or gas-solid-liquid mixed substances in situ and realizes unmanned intellectualization in situ underground. The in-situ fluidization exploitation can change a series of problems of low production efficiency, poor safety, serious ecological damage, low resource exploitation rate, large ground transportation/conversion energy loss and the like in the field of mining industry at present, and realize the revolution of deep coal resource exploitation idea and mode.
Geothermal resources are green, low-carbon and recyclable renewable energy sources, have the characteristics of large reserves, wide distribution, cleanness, environmental protection, good stability, wide application and the like, and are novel clean energy sources which are feasible and competitive. At present, the shallow hydrothermal aquifer geothermal energy heating (refrigerating) technology mainly based on the heat pump technology is basically mature, the existing deep geothermal energy reservoir fracturing and cold water recharging technology is difficult, and the controllability and the extraction efficiency are low. In the process of deep coal resource fluidization mining, in order to effectively control movement of stope rock stratum and avoid disasters such as impact mine pressure, fluidization filling operation is required to be carried out on a goaf.
Therefore, in order to realize the safe fluidized mining and fluidized filling operation of deep mine coal resources and the efficient fluidized circulating mining of deep mine geothermal energy resources, it is urgently needed to develop a deep mine geothermal energy and coal resource fluidized synergistic mining method to solve the problems.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide a deep mine geothermal energy and coal resource fluidization collaborative mining method, which realizes high-efficiency circulation extraction of deep mine geothermal energy and fluidization safe mining of deep coal resources.
The invention adopts the following technical scheme for solving the technical problems:
a deep mine geothermal energy and coal resource fluidization collaborative mining method specifically comprises the following steps:
step a, according to the actual mining geological conditions of a coal seam, arranging a longwall roadway-by-roadway fluidized coal mining working face, carrying out model selection and system arrangement on mining equipment related to the working face, carrying out unmanned intelligent coal mining operation on coal resources by adopting an unmanned intelligent shield machine, and carrying out fluidized transportation on the mined coal powder to the ground surface through a screw conveyor and a pipeline system;
b, adopting a strip type, room-and-pillar type and other partial mining method, mining the adjacent weak geothermal energy reservoir stratum at the lower part of the coal seam by using an unmanned intelligent shield machine, and constructing a space required by geothermal energy storage;
c, after cementing materials such as coal ash and cement are added into the mined geothermal energy reservoir rock powder, the geothermal energy reservoir rock powder is conveyed to a mined-out area of the fluidized coal face through a conveying roadway by a pumping pipeline system to carry out filling operation, and a filling body is formed;
d, after the geothermal energy reservoir is mined, laying a cold water recharging pipeline and a hot water extracting pipeline, so that the hydrothermal geothermal energy can be effectively stored and taken, and constructing a regional isolation retaining wall at a mining stop line position to form a geothermal energy circulating mining system;
step e, after the pipeline laying and the isolation retaining wall are implemented, cold water is injected into the geothermal energy storage space, a water level monitoring and temperature sensing device is arranged in the area, and the hydrothermal geothermal energy storage amount and the temperature threshold value are monitored in real time on line; the fluidized cooperative mining operation of geothermal energy and coal resources in the mining area is completed;
and f, repeating the steps a to e, and completing the fluidized collaborative mining operation of geothermal energy and coal resources of other mining areas.
In the step a, the coal resource fluidization excavation operation is determined by the tunneling section and the length, the fluidization filling operation process is mainly determined by the setting time and the strength of the cemented filling material, and the two are coordinated to complete the whole mining area mining.
As a further preferable scheme of the deep mine geothermal energy and coal resource fluidization collaborative mining method, in the step b, a thin coal line or a weak rock stratum which is easy to mine and has good heat storage performance is selected in the near geothermal energy reservoir of the coal seam, so that the construction and storage of the space of the geothermal energy reservoir are facilitated.
As a further preferable scheme of the deep mine geothermal energy and coal resource fluidization collaborative mining method, in the step b, a space required by geothermal energy storage is constructed, and the rock mass in the region is reserved with a size which meets the long-term stability of the geothermal energy circulation mining process.
As a further preferable scheme of the fluidized collaborative mining method for geothermal energy and coal resource in deep mines, in the step d, the laid cold water recharging and hot water extracting pipelines are respectively positioned in the upper lane and the lower lane of the geothermal energy storage space, so that the hydrothermal geothermal energy can be effectively conveyed.
As a further preferable scheme of the fluidized collaborative mining method for deep mine geothermal energy and coal resource, in the step e, a water level monitoring and temperature sensing device is arranged in the geothermal energy storage space and is used for real-time online monitoring of hydrothermal geothermal energy storage capacity and temperature threshold.
The beneficial effects of the invention include:
1. the invention can guarantee the source of a large amount of filling materials required by the coal resource fluidization filling operation of the deep mine;
2. the invention can realize the high-efficiency cyclic development of the geothermal energy resources of the deep mine;
3. the method can effectively utilize the underground solid waste rock, control the movement of the stope rock stratum, realize the high-efficiency and cyclic exploitation of geothermal energy resources and realize the safe exploitation of coal bed resources; the method is simple and practical, has obvious economic and social benefits and has wide application prospect.
Drawings
FIG. 1 is a schematic diagram of a fluidized co-mining method of geothermal energy and coal resources in a deep mine according to the present invention.
Wherein: 1-material conveying roadway, 2-fluidized coal face, 3-filling body, 4-coal seam to be mined, 5-unmanned intelligent shield machine, 6-screw conveyor, 7-cold water recharging pipeline, 8-water level monitoring and temperature sensing device, 9-geothermal energy storage space, 10-geothermal energy storage layer, 11-cementing material pumping pipeline, 12-regional isolation retaining wall and 13-hot water extraction pipeline.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The burial depth of a coal seam mainly mined by a certain mine reaches 2000m, the mining height of the coal seam is 3.0m, the ground temperature of surrounding rocks adjacent to the lower part reaches 70-80 ℃, and in order to realize high-efficiency circulating extraction of geothermal energy of a deep mine and fluidized safe mining of deep coal resources, a fluidized and collaborative mining method of the geothermal energy of the deep mine and the coal resources is adopted.
The deep mine geothermal energy and coal resource fluidization collaborative mining method comprises the following specific steps:
a. according to the actual mining geological conditions of the coal seam, arranging a longwall roadway-by-roadway fluidized coal face 2, carrying out model selection and system arrangement on mining equipment related to the face, carrying out unmanned intelligent coal mining operation on coal resources by adopting an unmanned intelligent shield machine 5, and carrying out fluidized transportation on the mined coal powder to the ground surface through a screw conveyor 6 and a pipeline system;
b. by adopting a strip type, room-and-column type and other partial mining method, a weak geothermal energy reservoir layer adjacent to a 50m layer of the lower part of a coal seam is mined by an unmanned intelligent shield machine, and a space required by geothermal energy storage is constructed;
c. after cementing materials such as fly ash and cement are added into the mined geothermal energy reservoir rock powder, the geothermal energy reservoir rock powder is conveyed to a mined goaf of a fluidized coal face 2 through a material conveying roadway 1 by a pumping pipeline system 11 to be filled to form a filling body 3;
d. after the geothermal energy reservoir is exploited, a cold water recharging pipeline 7 and a hot water extracting pipeline 13 are laid, so that the hydrothermal geothermal energy can be effectively stored and extracted, and an area isolation retaining wall 12 is constructed at the mining stopping line position to form a geothermal energy circulating exploitation system;
e. after the pipeline laying and the isolation retaining wall are implemented, cold water is injected into the geothermal energy storage space 9, a water level monitoring and temperature sensing device 8 is arranged in the area, and the hydrothermal geothermal energy storage amount and the temperature threshold value are monitored in real time on line; the fluidized cooperative mining operation of geothermal energy and coal resources in the mining area is completed;
f. and (e) repeating the steps a to e, and completing the fluidized collaborative mining operation of geothermal energy and coal resources in other mining areas.
The fluidized co-mining method for the geothermal energy and the coal resources of the deep mine is characterized in that the fluidized mining working procedure of the coal seam is mainly determined by the tunneling section and the length of a roadway, the fluidized filling working procedure is mainly determined by the setting time and the strength of a cemented filling material, and the two are coordinated and matched to complete the mining of the whole mining area.
According to the fluidized collaborative mining method for the geothermal energy and the coal resource of the deep mine, a thin coal line or a weak rock stratum which is easy to mine and has good heat storage performance is generally selected as the geothermal energy reservoir layer adjacent to the coal seam, so that the construction and the storage of a geothermal energy storage space are facilitated.
According to the fluidized collaborative mining method for deep mine geothermal energy and coal resources, after the mining methods of a strip type, a room-and-pillar type and the like are adopted, the size, strength and other designs of a residual geothermal energy reservoir can meet the requirement of long-term stable geothermal energy circulating mining.
According to the fluidized collaborative mining method for geothermal energy and coal resources in deep mines, the laid cold water recharging and hot water extracting pipelines are respectively positioned at the upper lane and the lower lane of the geothermal energy storage space, so that the hydrothermal geothermal energy can be effectively conveyed.
According to the deep mine geothermal energy and coal resource fluidization collaborative mining method, the water level monitoring and temperature sensing device is arranged in the geothermal energy storage space, and the hydrothermal geothermal energy storage capacity and the temperature threshold value can be monitored in real time on line.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention. While the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (5)
1. A deep mine geothermal energy and coal resource fluidization collaborative mining method is characterized by comprising the following steps:
step a, according to the actual mining geological conditions of a coal seam, arranging a longwall roadway-by-roadway fluidized coal mining working face (2), carrying out model selection and system arrangement on relevant mining equipment of the working face, carrying out unmanned intelligent coal mining operation on coal resources by adopting an unmanned intelligent shield machine (5), and carrying out fluidized transportation on the mined coal powder to the ground surface through a screw conveyor (6) and a pipeline system;
b, adopting a strip or room-and-pillar type mining method, and mining the adjacent weak geothermal energy reservoir stratum at the lower part of the coal seam by using an unmanned intelligent shield machine to construct a space required by geothermal energy storage;
c, after coal ash and cement are added into the mined geothermal energy reservoir rock powder, the geothermal energy reservoir rock powder is conveyed to a goaf of a fluidized coal face (2) through a material conveying roadway (1) through a pumping pipeline system (11) to be filled to form a filling body (3);
d, after the geothermal energy reservoir is mined, laying a cold water recharging pipeline (7) and a hot water extracting pipeline (13) to facilitate the effective access of the hydrothermal geothermal energy, and constructing an area isolation retaining wall (12) at a mining stopping line position to form a geothermal energy circulating mining system;
step e, after the pipeline laying and the isolation retaining wall are implemented, cold water is injected into the geothermal energy storage space (9), a water level monitoring and temperature sensing device (8) is arranged in the area, and the hydrothermal geothermal energy storage amount and the temperature threshold value are monitored in real time on line; the fluidized cooperative mining operation of geothermal energy and coal resources in the mining area is completed;
and f, repeating the steps a to e, and completing the fluidized collaborative mining operation of geothermal energy and coal resources of other mining areas.
2. The method for fluidized collaborative mining of geothermal energy and coal resources in deep mines according to claim 1, wherein in the step a, the fluidized mining operation of the coal resources is determined by the tunneling section and the length, the fluidized filling operation process is mainly determined by the setting time and the strength of the cemented filling material, and the two are coordinated to complete the mining of the whole mining area.
3. The fluidized collaborative mining method for deep mine geothermal energy and coal resource according to claim 1, wherein in the step b, a thin coal line or a weak easily-mined and well-heat-storage rock stratum is selected from a weak geothermal energy reservoir layer adjacent to the lower portion of the coal seam, so that a geothermal energy reservoir space is constructed and stored conveniently.
4. The deep mine geothermal energy and coal resource fluidization collaborative mining method according to claim 1, wherein in the step b, a space required by geothermal energy storage is constructed, and rock mass in the region is reserved with a size which meets long-term stability of a geothermal energy circulation mining process.
5. The fluidized co-exploitation method for geothermal energy and coal resource in deep mines according to claim 1, wherein in step d, the laid cold water recharging pipeline (7) and hot water extraction pipeline (13) are respectively located at an upper roadway and a lower roadway of the geothermal energy storage space, so as to facilitate effective transportation of hydrothermal geothermal energy.
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| CN113404480A (en) * | 2021-05-20 | 2021-09-17 | 东北大学 | Co-mining method for geothermal energy and mineral resources |
| CN113404490B (en) * | 2021-06-27 | 2022-02-18 | 中国矿业大学 | Deep coal fluidization pipeline conveying system |
| CN113338934B (en) * | 2021-07-07 | 2023-12-08 | 中国矿业大学 | Deep coal fluidization exploitation in-situ gasification device |
| CN115030775A (en) * | 2022-06-16 | 2022-09-09 | 中国矿业大学 | Mine geothermal recycling cooperative heat damage treatment system and method |
| CN114934772B (en) * | 2022-06-29 | 2023-03-24 | 中国矿业大学 | Deep coal fluidization exploitation in-situ gasification device |
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