CN112392543B - Resource utilization method and system for storing and releasing carbon dioxide in goaf of abandoned mine - Google Patents
Resource utilization method and system for storing and releasing carbon dioxide in goaf of abandoned mine Download PDFInfo
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- CN112392543B CN112392543B CN202011266404.7A CN202011266404A CN112392543B CN 112392543 B CN112392543 B CN 112392543B CN 202011266404 A CN202011266404 A CN 202011266404A CN 112392543 B CN112392543 B CN 112392543B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 494
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 247
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 247
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000007789 gas Substances 0.000 claims abstract description 231
- 238000000605 extraction Methods 0.000 claims abstract description 68
- 239000010812 mixed waste Substances 0.000 claims abstract description 18
- 239000002699 waste material Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000000567 combustion gas Substances 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 6
- 239000002912 waste gas Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims 3
- 238000010672 photosynthesis Methods 0.000 abstract description 19
- 230000029553 photosynthesis Effects 0.000 abstract description 18
- 239000003245 coal Substances 0.000 abstract description 17
- 238000010521 absorption reaction Methods 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 10
- 238000000746 purification Methods 0.000 abstract description 7
- 230000012010 growth Effects 0.000 abstract description 6
- 239000011435 rock Substances 0.000 abstract description 2
- 230000008635 plant growth Effects 0.000 description 9
- 239000011083 cement mortar Substances 0.000 description 6
- 238000005065 mining Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
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- 241000282414 Homo sapiens Species 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
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- 150000001720 carbohydrates Chemical class 0.000 description 1
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- 239000011521 glass Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
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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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G7/00—Botany in general
- A01G7/06—Treatment of growing trees or plants, e.g. for preventing decay of wood, for tingeing flowers or wood, for prolonging the life of plants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G5/00—Storing fluids in natural or artificial cavities or chambers in the earth
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ecology (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Forests & Forestry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Wood Science & Technology (AREA)
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- Environmental Sciences (AREA)
- Treating Waste Gases (AREA)
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Abstract
The invention discloses a resource utilization method and a resource utilization system for storing and releasing carbon dioxide in a goaf of a abandoned mine, and belongs to the field of comprehensive utilization of resources. The invention is prepared by mixing CO 2 Feeding the mixed waste gas into a goaf of a waste mine, and utilizing the goaf of the waste mine to treat CO 2 The mixed waste gas filters partial gas in the holes of the overlying rock stratum of the broken coal bed, is sent to surface vegetation by using an extraction well, participates in vegetation photosynthesis, promotes growth, and further utilizes CO 2 And photosynthesis is carried out, so that resource utilization of carbon dioxide stored and released in the goaf of the abandoned mine is realized. The invention simplifies CO as a whole 2 The purification process and the absorption treatment process utilize the existing resources and waste resources, reduce the cost investment and integrally improve the CO 2 The resource utilization efficiency.
Description
Technical Field
The invention belongs to the field of comprehensive utilization of resources, and relates to a resource utilization method and a resource utilization system for storing and releasing carbon dioxide in a goaf of a abandoned mine.
Background
Carbon dioxide (CO) 2 ) Is a byproduct generated during the combustion of chemical fuels such as coal, petroleum, natural gas and the like, and a large amount of CO is exhaled by human beings and animals and plants in the metabolism process 2 A gas. CO in the atmosphere 2 The one-way valve is similar to greenhouse glass, is called greenhouse effect, and is commonly called greenhouse gas in the global warming climate research. CO 2 2 The greenhouse effect of (A) makes it play a very important role in controlling global climate. At present stage CO 2 The gas treatment and disposal mainly comprises three ways including separation and recovery, disposal and effective utilization, wherein the separation and recovery mainly comprises an absorption separation method, an adsorption separation method, a membrane separation method and a membrane separation-absorption combination method; the disposal mainly comprises underground storage, ocean and land ecological storage; the photosynthesis and chemical fixation of plants and algae are mainly utilized effectively.
The above method has the following problems: (1) CO 2 2 The gas absorption separation method has physical absorption and chemical absorption, the physical absorption separation efficiency is not high, the cost is higher, the chemical absorption is easy to generate bubbles and entrainment, and the energy consumption and the investment are large; cO 2 The gas adsorption separation method has limited adsorption capacity, needs a large amount of adsorbents, is frequent in adsorption and desorption and has low automation degree; CO 2 2 High purity CO is difficult to obtain by gas membrane separation 2 ；CO 2 The gas membrane separation-absorption combined method has complex flow. (2) CO 2 2 The underground gas storage mode is safe and reliable, flexible in application and sufficient in storage capacity, but has low utilization value and resource waste. (3) CO 2 2 The photosynthesis and chemical fixation of plants and algae in gas accord with the view point of green chemistry, but the utilization rate is limited, and the gas cannot be combined with the discharged CO 2 The total amount is counterbalanced.
To sum up, CO 2 A large amount of cost investment is often needed in the gas purification and absorption treatment process, and the resource utilization efficiency of the gas purification and absorption treatment process needs to be improved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a resource utilization method and a resource utilization system for storing and releasing carbon dioxide in a goaf of a abandoned mine. The invention aims at the comprehensive utilization of carbon dioxide, reduces the cost investment of purification and absorption treatment processes, simplifies the process and improves the resource utilization efficiency of the carbon dioxide.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention discloses a resource utilization method for storing and releasing carbon dioxide in a goaf of a abandoned mine, which comprises the following steps:
1) CO Collection 2 Mixing the waste gas, and mixing the obtained CO 2 Injecting the mixed waste gas into the goaf of the abandoned mine, and carrying out CO treatment by utilizing a fissure zone in the overlying rock layer of the coal bed at the upper part of the goaf of the abandoned mine 2 Filtering the mixed waste gas to obtain purified CO 2 Mixing the gas;
2) arranging CO according to the height of the caving zone and the height of the fractured zone in the goaf of the abandoned mine 2 Extracting a well; wherein, CO 2 The arrangement depth of the extraction well is the bottom of the caving zone in the goaf of the abandoned mine;
3) utilizing CO obtained in step 2) 2 Extracting the CO obtained in the step 1) from the extraction well 2 Mixed gasThe waste gas is pumped to the ground for collection and utilization, and the resource utilization method of storing and releasing carbon dioxide in the goaf of the abandoned mine is realized.
Preferably, in the step 2), the fitting formula of the heights of the caving zone and the fissure zone of the goaf of the abandoned mine comprises:
L＝25.1h+6.5；M＝5.3h+8.3；
wherein L is the sum of heights of the falling zone and the fractured zone, and m; m is the height of the caving zone, M; h is the coal seam mining thickness m.
Preferably, in step 1), CO 2 The mixed exhaust gas comprises chemical plant combustion gas, water gas combustion gas and flue gas.
Further preferably, CO 2 The mixed exhaust gas component comprises N 2 、CO 2 And a small amount of SO 2 。
Preferably, in step 2), CO 2 The composition of the mixed gas comprises N 2 And CO 2 。
Preferably, in step 1), CO is collected 2 The pressure range of the mixed waste gas is 0.15-0.35 MPa.
Preferably, in step 1), the CO obtained is 2 The pressure range of the mixed waste gas injected into the goaf of the abandoned mine is 1.5-2.0 MPa.
Preferably, in step 3), CO 2 The mixed gas is pumped to the ground and collected, then is conveyed to a plant planting area through a pipeline, and is conveyed to CO in the plant planting area 2 The concentration is 800-1200 ppm.
The invention also discloses a resource utilization system for storing and releasing carbon dioxide in the goaf of the abandoned mine, which comprises CO 2 Mixed gas transfer line, CO 2 Extraction well and CO 2 Gas treatment discharge, CO 2 Gas utilization vent and CO 2 A delivery line; CO 2 2 The gas inlet end of the mixed gas conveying pipeline is provided with CO 2 Mixed gas collecting apparatus, CO 2 The gas outlet end of the mixed gas conveying pipeline is communicated with the goaf inlet of the abandoned mine; CO 2 2 The arrangement depth of the underground lower section of the extraction well is the bottom of the caving zone of the goaf of the abandoned mine; CO 2 2 A gas extraction pipe is arranged in the underground section of the extraction well, and gas is extractedThe gas inlet end of the gas extraction pipe is provided with a sieve pipe, the ground tail end of the gas extraction pipe is provided with a pump station and CO through a pipeline 2 The ground outlet section of the extraction well is provided with CO 2 A gas treatment vent.
Preferably, CO 2 The diameter of the extraction well is 800-1000 mm, the diameter of the gas extraction pipe is 150-500 mm, the aperture of the sieve pipe is 100-300 mm, the assembly depth of the sieve pipe is consistent with the bottom of the caving zone, and the top of the sieve pipe is 1-2 m above the fracture zone.
Preferably, CO 2 Gas treatment vent through CO 2 Gas utilization vent and CO 2 Delivery line connection, CO 2 The conveying pipeline is provided with CO 2 Gas transmission holes in which CO 2 The diameter of the conveying pipeline is 150-500 mm, and CO is 2 The diameter of the gas transmission hole is 100-150 mm, and CO is 2 The spacing distance of the air transmission holes is 6-8 m.
Preferably, CO 2 The gas inlet end of the mixed gas conveying pipeline is provided with CO 2 Mixed gas flow control valve and CO 2 First pressure gauge for mixed gas, CO 2 The gas outlet end of the mixed gas conveying pipeline is provided with CO 2 A second pressure gauge for mixed gas; the joint of the gas extraction pipe and the pump station is provided with a first valve, CO 2 Extraction well and CO 2 The joint of the gas treatment discharge port is provided with a second valve and CO 2 The gas treatment discharge port is provided with a gas detection device for detecting CO 2 The gas detection device of (1); CO 2 2 The conveying pipeline is provided with CO 2 Flow control valve and CO 2 A flow controller.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a resource utilization method for storing and releasing carbon dioxide in a goaf of a abandoned mine, which is implemented by using CO 2 The mixed waste gas is stored in a waste goaf, and CO is generated 2 Gas SO with large specific gravity in mixed waste gas 2 Gas CO with lower specific gravity and settling downwards 2 、N 2 Upwards dissipating, and utilizing the caving zone, the fissure zone and the fissure, the micropore or the pore structure in the soil layer of the goaf of the abandoned mine to collect the CO 2 Solids in mixed exhaust gasesThe body particles are filtered, so that the reasonable waste resource reutilization is realized in the goaf of the abandoned mine, and the CO is simplified 2 Purification process to obtain purified CO 2 Mixing the gas, and simultaneously arranging CO in the caving zone and the fissure zone of the goaf of the abandoned mine 2 Extracting CO from well after accelerated purification 2 Mixed gas migration velocity, obtained CO 2 The mixed gas is conveyed to the ground through an extraction well matched pipeline and collected, and then is transported to an application occasion, so that resource utilization of carbon dioxide stored and released in a goaf of the abandoned mine is realized. The invention simplifies CO as a whole 2 The purification process and the absorption treatment process utilize the existing resources and waste resources, reduce the cost investment and integrally improve the CO 2 The resource utilization efficiency.
Further, purified CO 2 The mixed gas is pumped to the ground for collection and then is conveyed to a plant planting area through a pipeline, and the purified CO can be effectively utilized 2 N in the mixed gas 2 And CO 2 The active ingredients of (2) are used for providing photosynthesis and nitrogen fixation of plants and promoting plant growth.
The invention also discloses a resource utilization system for storing and releasing carbon dioxide in the goaf of the abandoned mine, wherein an extraction well is arranged at the bottom of the caving zone of the goaf of the abandoned mine, and a sieve tube is arranged at the lower part of an extraction pipe, so that CO is increased 2 The extraction efficiency of gas can ensure the purified CO 2 The transport efficiency of the mixed gas to the ground.
Further, CO is continuously provided in the aerial part 2 A conveying pipeline forms a well-ground combined plant growth circulation system to realize the utilization of CO in the goaf of the abandoned mine 2 Green utilization, energy conservation and emission reduction, economy and high efficiency.
Further, by in CO 2 A pressure gauge and CO are arranged on the mixed gas conveying pipeline 2 Mixed gas flow control valve, and by mixing with CO 2 The conveying pipeline is provided with CO 2 Flow control valve and CO 2 Flow controller capable of effectively regulating CO 2 The concentration is supplied, and the CO is improved to the maximum extent 2 The utilization rate of the plant growth promoter is improved, the quality is optimized, and the growth of the plant is realized based on CO 2 And (3) establishing a ground plant growth system with concentration regulation and control to form a well-ground combined plant growth circulation system.
In summary, the resource utilization method and system for storing and releasing carbon dioxide in the goaf of the abandoned mine disclosed by the invention (1) reduce CO in the coal mine 2 The method has the advantages that the method is discharged to the atmosphere, the greenhouse effect is reduced, energy is saved, emission is reduced, and a new idea is provided for building a green mine; (2) CO 2 2 Is a source of carbon in carbohydrates produced by photosynthesis of green plants, provides a life foundation for life of all animals and plants, and CO is fixed by photosynthesis of the green plants 2 Is the starting point of organic matter synthesis and effectively utilizes CO 2 The plant growth is promoted, the plant growth rate is improved, the use of a preparation for improving the plant photosynthesis capacity is reduced, the environmental pollution is reduced, and the preparation is environment-friendly, cheap and convenient; (3) taking the abandoned mine goaf as CO 2 The storage place scientifically and reasonably utilizes the abandoned mine and changes waste into valuable.
Drawings
FIG. 1 is a flow chart of a resource utilization method for storing and releasing carbon dioxide in a goaf of a abandoned mine according to the invention;
FIG. 2 shows CO 2 CO in mixed waste gas 2 Schematic diagram of gas migration, storage and release;
FIG. 3 is a schematic diagram of gas extraction in a goaf of a abandoned mine;
FIG. 4 is a schematic representation of the utilization of CO by surface vegetation 2 Gas schematic.
Wherein: 1-CO 2 Mixing the waste gas; 2-CO 2 A mixed gas collecting device; 3-CO 2 A mixed gas flow control valve; 4-CO 2 A mixed gas first pressure gauge; 5-CO 2 A mixed gas delivery line; 6-goaf of abandoned mine; 7-CO 2 A second pressure gauge for mixed gas; 8-overburden over a coal seam; 9-fissure zone; CO in 10-overburden 2 Mixing the gas; 11-earth surface; 12-vegetation; 13-respiration; 14-photosynthesis; 15-CO 2 A gas; 16-a water barrier layer; 17-an aqueous layer; 18-CO 2 Extracting a well; 19-a sieve tube; 20-gas extraction pipe; 21-cement mortar; 22-a pump station; 23-a first valve; 24-a second valve; 25-a gas detection device; 26-CO 2 A gas treatment discharge port; 27-CO 2 A flow control valve; 28-CO 2 A flow control instrument; 29-CO 2 A gas transmission hole; 30-CO 2 A delivery line; 31-CO 2 The gas utilizes a vent.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
as shown in FIG. 1, it is a flow chart of a resource utilization method for storing-releasing carbon dioxide in a goaf of a abandoned mine disclosed by the invention, and the method is to realize the storage-release by using the goaf of the abandoned mineCarbon dioxide (CO) 2 ) The method for promoting the growth of the surface plants comprises the following steps:
5% -30% of CO in flue gas 2 The low pressure (suction pressure) is about 0.15 to 0.35MPa, and the high pressure (exhaust pressure) is about 1.5 to 2.0 MPa.
The method comprises the following steps: negative pressure CO collection 2 The exhaust gas 1 is mixed. By using CO 2 Mixed gas collecting device 2 for collecting CO in water gas combustion and flue gas of chemical plant under negative pressure 2 Mixed exhaust gas 1, CO 2 CO in the mixed exhaust gas 1 2 The gas content is 5-30%. By CO 2 CO control by mixed gas flow control valve 3 2 Flow rate and pressure of mixed exhaust gas 1, wherein CO 2 The monitoring pressure range of the first mixed gas pressure gauge 4 is 0.15-0.35 MPa (suction pressure).
Step two: collecting CO 2 The mixed waste gas 1 is injected into the goaf 6 of the abandoned mine under positive pressure. CO 2 2 Mixed waste gas 1 is passed through CO 2 The mixed gas conveying pipeline 5 is sent into a waste mine goaf 6, and CO is fed 2 The monitoring pressure range of the second pressure gauge 7 for the mixed gas is 1.5-2.0 MPa (exhaust pressure), and CO in the goaf 6 of the abandoned mine 2 The mixed gas filters partial gas in the pores of the overlying strata 8 of the crushed coal bed, and the gas is transported upwards to a fissure zone 9 to form CO in the overlying strata 2 Mixed gas 10 and ground surface 11. The surface vegetation 12 performs respiration 13 and photosynthesis 14 simultaneously to convert CO 2 The gas 15 is fully utilized. As shown in fig. 2.
Step three: and determining the heights of the caving zone and the fractured zone 9 of the goaf 6 of the abandoned mine. Collecting data of the caving zone and the fractured zone 9 height on-site actual measurement, numerical simulation, physical simulation, theoretical analysis and the like of the coal seam mining of the abandoned mine, and comprehensively determining a fitting formula to calculate the heights of the caving zone and the fractured zone 9.
Step four: designing and constructing abandoned mine goaf CO 2 A surface extraction well 18. Constructing a gas extraction well 18 of the goaf 6 of the abandoned mine, wherein the depth of the extraction well 18 reaches the bottom of the caving zone of the goaf 6, a gas extraction pipe 20 is arranged in the extraction well, and the lower part of the gas extraction pipe 20 is provided with a sieve tube 19, so that CO is convenient to be extracted 2 And gas extraction, wherein the water-bearing stratum 17 is protected by cement mortar 21. Containing waterA coal overburden 8 and a water barrier 16 are also present between the layer 17 and the abandoned mine goaf 6. The ground tail end of the gas extraction pipe 20 is provided with a first valve 23 and a pump station 22 for controlling CO 2 A second valve 24 and a gas detection device 25 are arranged on the extraction well 18 for detecting CO 2 The gas/gas detection device 25 is provided with CO 2 Gas treatment discharge port 26, reserved ground plane CO 2 CO of the transfer line 30, gas detection device 25 2 Gas treatment discharge 26 and ground CO 2 The gas is connected by the discharge port 31, and cement mortar is adopted for sealing after the construction is finished. As shown in fig. 3.
The diameter of the extraction well 18 is 800-1000 mm, the diameter of the gas extraction pipe 20 is 150-500 mm, and the aperture of the sieve pipe 19 is 100-300 mm; the mounting depth of the sieve tube 19 is 1-2 m above the caving zone 9; and sealing the extraction well 18 with 1:0.5 cement mortar 21 after the construction is finished.
Step five: establishment of CO-based 2 A ground plant growing system with concentration regulation. Step four CO 2 Gas treatment discharge 26, CO 2 Gas utilization vent 26' for providing CO at ground level 2 Flow control valve 27 and CO 2 Flow controller 28 for passing the CO required by the plant 2 Concentration controlled CO 2 Flow control valve 27 on/off, CO 2 The conveying pipes 30 are provided with CO at certain intervals 2 Gas transmission hole 29 for CO 2 The gas is used for plant photosynthesis, and the CO with proper concentration 2 And the carbon source required by plant photosynthesis can be sufficiently supplied, so that the growth rate is increased to the maximum extent, and the yield and the quality are optimized. Under sufficient sunlight, CO 2 The flow control valve 27 is closed and photosynthesis relies on natural light, whereas CO is turned on 2 Flow control valve 27 regulates CO 2 The flow rate of the gas. As shown in fig. 4.
CO as described above 2 The concentration control range is 800-1200 ppm to meet the requirement of plant photosynthesis on CO to the maximum extent 2 Demand, CO 2 The diameter of the conveying pipeline 30 is 150-500 mm, and CO is 2 The diameter of the air delivery hole 29 is set to be 100-150 mm, and the spacing distance is 6-8 m.
Step six: form a well-ground combined energy-saving emission-reducing and plant growth circulating system. CO is extracted and diffused underground to realize utilization of the goaf of the abandoned mine 2 Green utilization, energy conservation and emission reduction, economy and high efficiency.
In the above process, CO 2 The mixed exhaust gas 1 comprises chemical plant combustion gas, water gas combustion gas and flue gas, and its main component comprises N 2 、CO 2 、O 2 And a small amount of SO 2 (ii) a Purified CO 2 The composition of the mixed gas comprises N 2 And CO 2 。CO 2 The mixed waste gas 1 is stored in the abandoned goaf 6, and CO is 2 The gas SO with larger specific gravity in the mixed waste gas 1 2 、O 2 Gas CO of relatively low specific gravity left in situ 2 、N 2 Upward dissipation, and simultaneously, arranging CO in the caving zone and the fissure zone 9 of the goaf of the abandoned mine 2 The extraction well 18 accelerates the gas migration speed and is pumped to the ground to be utilized by plants.
Carbon dioxide is collected from the outside and injected into the abandoned mine goaf 6, the invention utilizes the abandoned mine goaf 6, namely waste resources, and simultaneously stores and discharges the carbon dioxide to the ground to be absorbed and utilized by plants, thereby realizing the reutilization of waste gas.
The invention also discloses a resource utilization system for storing and releasing carbon dioxide in the goaf of the abandoned mine for realizing the method, which comprises CO 2 Mixed gas transfer line 5, CO 2 Extraction well 18, CO 2 Gas treatment discharge 26, CO 2 Gas utilization vent 31 and CO 2 A delivery line 30;
CO 2 the gas inlet end of the mixed gas conveying pipeline 5 is provided with CO 2 Mixed gas collecting device 2, CO 2 The gas outlet end of the mixed gas conveying pipeline 5 is introduced into the inlet of the abandoned mine goaf 6;
CO 2 the arrangement depth of the underground section of the extraction well 18 is the bottom of the caving zone of the goaf of the abandoned mine; CO 2 2 A gas extraction pipe 20 is arranged in the underground section of the extraction well 18, a screen pipe 19 is arranged at the gas inlet end of the gas extraction pipe 20, and a pump is arranged at the ground tail end of the gas extraction pipe 20 through a pipelineStation 22, CO 2 The ground outlet section of the extraction well 18 is provided with CO 2 Gas treatment discharge 26, CO 2 Gas treatment vent 26 through CO 2 Gas utilization vent 31 and CO 2 A delivery line 30 connected to CO 2 The conveying pipeline 30 is provided with CO 2 And a gas transfer port 29.
Wherein, CO 2 The diameter of the extraction well 18 is 800-1000 mm, the diameter of the gas extraction pipe 20 is 150-500 mm, the aperture of the sieve pipe 19 is 100-300 mm, the assembly depth of the sieve pipe 19 is consistent with the bottom of the caving zone, and the top of the sieve pipe 19 is 1-2 m above the fracture zone 9; CO 2 2 The diameter of the conveying pipeline 30 is 150-500 mm, and CO is 2 The diameter of the gas transmission hole 29 is 100-150 mm, and CO is 2 The spacing distance of the air delivery holes 29 is 6-8 m.
Wherein, CO 2 The gas inlet end of the mixed gas conveying pipeline 5 is provided with CO 2 Mixed gas flow control valve 3 and CO 2 First pressure gauge for mixed gas 4, CO 2 CO is arranged at the gas outlet end of the mixed gas conveying pipeline 5 2 A mixed gas second pressure gauge 7;
a first valve 23 is arranged at the joint of the gas extraction pipe 20 and the pump station 22, and CO is 2 Extraction well 18 and CO 2 The junction of the gas treatment discharge 26 is provided with a second valve 24, CO 2 The gas treatment discharge port 26 is provided with a gas detection device for detecting CO 2 The gas detection device 25; CO 2 2 The conveying pipeline 30 is provided with CO 2 Flow control valve 27 and CO 2 A flow controller 28.
The invention is further illustrated below with reference to specific application examples:
a No. 2 coal seam of a certain mine is mainly mined, the thickness is 5m, the burial depth is 350m, the mine belongs to a nearly horizontal coal seam, and a fully mechanized top coal caving mining process is adopted. After the coal seam is completely mined, the coal seam is a waste mine, and the goaf 6 of the waste mine is extracted by adopting the following steps of 2 The gas is used for plant photosynthesis, and the comprehensive utilization of the associated resources of the abandoned mine is realized.
The method comprises the following steps: negative pressure CO collection 2 The exhaust gas 1 is mixed. By using CO 2 Mixed gas collecting device 2 for collecting CO in water gas combustion and flue gas of chemical plant under negative pressure 2 Mixed exhaust gas 1, CO 2 CO in the mixed exhaust gas 1 2 The gas content is 5-30%. (CO) 2 The composition of the mixed exhaust gas 1 includes N 2 、CO 2 And a small amount of SO 2 ) By CO 2 CO control by mixed gas flow control valve 3 2 Flow rate and pressure of mixed exhaust gas 1, wherein CO 2 The monitoring pressure range of the first mixed gas pressure gauge 4 is 0.2-0.3 MPa.
Step two: collecting CO 2 The mixed waste gas 1 is injected into the goaf 6 of the abandoned mine under positive pressure. CO 2 2 Mixed waste gas 1 is passed through CO 2 The mixed gas conveying pipeline 5 is sent into a waste mine goaf 6, and CO is fed 2 The monitoring pressure range of the mixed gas second pressure gauge 7 is 1.8-1.9 MPa, and CO in the abandoned mine goaf 6 2 The mixed waste gas 1 filters partial gas and solid particles in the pores of the crushed coal bed overburden 8, and the gas and the solid particles are transported upwards to a fracture zone 9 to obtain purified CO 2 The mixed gas is continuously passed through CO 2 The extraction well 18 performs extraction to reach the ground surface 11. Then the CO is sent to the surface vegetation 12 through a conveying pipeline to perform respiration 13, photosynthesis 14 and nitrogen fixation at the same time, and the CO is sent to 2 The gas is fully utilized, which is beneficial to the growth of vegetation.
Step three: and determining the heights of the caving zone and the fractured zone 9 of the goaf 6 of the abandoned mine. Comprehensively collecting data such as the caving zone of the No. 2 coal seam mining of the abandoned mine, the height on-site actual measurement of the fractured zone 9, numerical simulation, physical simulation, theoretical analysis and the like, and obtaining a fitting formula as follows:
l-25.1 h +6.5 (formula 1)
M ═ 5.3h +8.3 (formula 2)
In the formula: l is the sum of the heights of the caving zone and the fractured zone, m;
m-falling zone height, M;
h-coal seam mining thickness, m.
The heights of the falling zones and the fractured zones are 34.8m and 98m respectively according to the formula 1 and the formula 2.
Step four: constructing a gas extraction well 18 of the abandoned mine goaf 6, wherein the diameter of the gas extraction well is 900mm, the depth of the gas extraction well is 320.2m, an extraction pipe 20 with the diameter of 300mm is arranged in the gas extraction well, and the diameter of the extraction pipe is arranged at the bottom of the gas extraction wellThe depth of the 200mm sieve tube 19 is 320.2-220 m, the aquifer 17 adopts cement mortar to protect the wall, the ground tail end of the gas extraction tube 20 is provided with a first valve 23 and a pump station 22 to control gas extraction, and the extraction well 18 is provided with a second valve 24 and a gas detection device 25 for detecting CO 2 The gas/gas detection device 25 is provided with CO 2 Gas treatment discharge port 26, reserved ground plane CO 2 And (5) sealing the conveying pipeline 30 with cement mortar in a ratio of 1:0.5 after construction.
Step five: CO 2 2 Gas discharge port 31 for installing CO on the ground 2 Flow control valve 27 and CO 2 Flow controller 28 connected to CO 2 A delivery line 30 with a diameter of 300mm on which CO with a diameter of 120mm is arranged 2 Gas delivery port 29, CO 2 The gas transfer holes 29 are spaced apart by a distance of 7 m. Utilization of CO by surface vegetation 12 2 The gas undergoes photosynthesis, CO 2 The flow rate controller 15 controls CO of an appropriate concentration 2 Can provide enough carbon source for plant photosynthesis, improve growth rate, optimize yield and quality, and supply CO to maximum extent 2 The concentration control range is 900-1100 ppm. Under sufficient sunlight conditions, the valve 27 is closed and photosynthesis relies on natural light, whereas CO is turned on 2 Flow control valve 27 regulates CO 2 The flow rate of the gas.
Step six: form a well-ground combined energy-saving emission-reducing and plant growth circulating system. Waste mine goaf CO is realized by means of underground extraction and ground diffusion 2 Green utilization, energy conservation and emission reduction, economy and high efficiency.
The above-mentioned contents 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 modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A resource utilization method for storing and releasing carbon dioxide in a goaf of a abandoned mine is characterized by comprising the following steps:
1) CO Collection 2 Mixing the waste gas, and mixing the obtained CO 2 Injecting the mixed waste gas into the goaf of the abandoned mine, and carrying out CO separation by utilizing a fissure zone at the upper part of the goaf of the abandoned mine 2 Filtering solid particles in the mixed waste gas to obtain purified CO 2 Mixing the gas;
2) arranging CO according to the height of the caving zone and the height of the fractured zone in the goaf of the abandoned mine 2 Extracting a well;
3) utilizing the CO 2 Extracting well to obtain CO 2 The mixed gas is pumped to the ground for collection, and the resource utilization method of storing and releasing carbon dioxide in the goaf of the abandoned mine is realized.
2. The resource utilization method for storing-releasing carbon dioxide in goaf of abandoned mine as claimed in claim 1, wherein in step 1), CO is used as raw material 2 The mixed exhaust gas comprises chemical plant combustion gas, water gas combustion gas and flue gas.
3. The resource utilization method for storing-releasing carbon dioxide in goaf of abandoned mine as claimed in claim 2, wherein CO is used as CO 2 The mixed exhaust gas component comprises N 2 、CO 2 And SO 2 。
4. The resource utilization method for storing-releasing carbon dioxide in goaf of abandoned mine as claimed in claim 1, wherein in step 2), CO is used as raw material 2 The composition of the mixed gas comprises N 2 And CO 2 。
5. The resource utilization method for storing-releasing carbon dioxide in goaf of abandoned mine as claimed in claim 1, wherein in step 3), CO is used as raw material 2 The mixed gas is pumped to the ground and collected, then is conveyed to a plant planting area through a pipeline, and is conveyed to CO in the plant planting area 2 The concentration is 800-1200 ppm.
6. Waste mine goaf resource utilization method for operating the waste mine goaf storage-release carbon dioxide resource utilization method according to any one of claims 1 to 5A resource utilization system for storing and releasing carbon dioxide in mine goaf is characterized by comprising CO 2 Mixed gas transfer line, CO 2 Extraction well and CO 2 Gas treatment discharge, CO 2 Gas utilization vent and CO 2 A delivery line;
CO 2 the gas inlet end of the mixed gas conveying pipeline is provided with CO 2 Mixed gas collecting apparatus, CO 2 The gas outlet end of the mixed gas conveying pipeline is communicated with the goaf inlet of the abandoned mine;
CO 2 the arrangement depth of the underground lower section of the extraction well reaches the bottom of the caving zone of the goaf of the abandoned mine; CO 2 2 A gas extraction pipe is arranged in the underground section of the extraction well, a sieve pipe is arranged at the gas inlet end of the gas extraction pipe, a pump station is arranged at the ground tail end of the gas extraction pipe through a pipeline, and CO is added 2 The ground outlet section of the extraction well is provided with CO 2 Gas treatment discharge, CO 2 The gas treatment discharge port is externally connected with CO 2 The gas utilizes a vent.
7. The resource utilization system for storing-releasing carbon dioxide in goaf of abandoned mine as claimed in claim 6, wherein CO is in the form of CO 2 The diameter of the extraction well is 800-1000 mm, the diameter of the gas extraction pipe is 150-500 mm, the aperture of the sieve pipe is 100-300 mm, the assembly depth of the sieve pipe is consistent with the bottom of the caving zone, and the top of the sieve pipe is 1-2 m above the fracture zone.
8. The resource utilization system for storing-releasing carbon dioxide in goaf of abandoned mine as claimed in claim 6, wherein CO is in the form of CO 2 Gas utilization vent and CO 2 Delivery line connection, CO 2 The conveying pipeline is provided with CO 2 A gas transmission hole;
wherein, CO 2 The diameter of the conveying pipeline is 150-500 mm, and CO is 2 The diameter of the gas transmission hole is 100-150 mm, and CO is 2 The spacing distance of the air transmission holes is 6-8 m.
9. The resource utilization of the abandoned mine goaf for storing-releasing carbon dioxide as claimed in claim 6With a system characterized by CO 2 The gas inlet end of the mixed gas conveying pipeline is provided with CO 2 Mixed gas flow control valve and CO 2 First pressure gauge of mixed gas, CO 2 The gas outlet end of the mixed gas conveying pipeline is provided with CO 2 And a second pressure gauge for mixed gas.
10. The resource utilization system for storing-releasing carbon dioxide in waste mine goaf as claimed in claim 6, wherein a first valve is arranged at the joint of the gas extraction pipe and the pump station, and CO is discharged from the pump station 2 Extraction well and CO 2 The joint of the gas treatment discharge port is provided with a second valve and CO 2 The gas treatment discharge port is provided with a gas detection device for detecting CO 2 The gas detection device of (1);
CO 2 the conveying pipeline is provided with CO 2 Flow control valve and CO 2 A flow controller.
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