CN104962476B - A kind of carbon dioxide underground sequestration method and system based on coal mine gob - Google Patents
A kind of carbon dioxide underground sequestration method and system based on coal mine gob Download PDFInfo
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- CN104962476B CN104962476B CN201510419546.5A CN201510419546A CN104962476B CN 104962476 B CN104962476 B CN 104962476B CN 201510419546 A CN201510419546 A CN 201510419546A CN 104962476 B CN104962476 B CN 104962476B
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- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 91
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 85
- 239000003245 coal Substances 0.000 title claims abstract description 52
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 39
- 230000009919 sequestration Effects 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012258 culturing Methods 0.000 claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000007864 aqueous solution Substances 0.000 claims abstract description 42
- 241000195493 Cryptophyta Species 0.000 claims abstract description 40
- 239000000243 solution Substances 0.000 claims abstract description 33
- 238000000605 extraction Methods 0.000 claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 7
- 239000007924 injection Substances 0.000 claims abstract description 7
- 239000008246 gaseous mixture Substances 0.000 claims abstract description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 14
- 239000011435 rock Substances 0.000 claims description 14
- 238000009395 breeding Methods 0.000 claims description 11
- 230000001488 breeding effect Effects 0.000 claims description 11
- 238000000855 fermentation Methods 0.000 claims description 11
- 238000010521 absorption reaction Methods 0.000 claims description 10
- 238000011049 filling Methods 0.000 claims description 8
- 239000000284 extract Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 3
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 3
- 238000003889 chemical engineering Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 230000009466 transformation Effects 0.000 claims description 2
- 235000019504 cigarettes Nutrition 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 14
- 238000000926 separation method Methods 0.000 abstract description 7
- 230000009467 reduction Effects 0.000 abstract description 6
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000003911 water pollution Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 63
- 229960004424 carbon dioxide Drugs 0.000 description 18
- 239000003546 flue gas Substances 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 238000005065 mining Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000002341 toxic gas Substances 0.000 description 2
- 241000269793 Cryothenia peninsulae Species 0.000 description 1
- 241000192700 Cyanobacteria Species 0.000 description 1
- 241000790917 Dioxys <bee> Species 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003225 biodiesel Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000258 photobiological effect Effects 0.000 description 1
- 230000029553 photosynthesis Effects 0.000 description 1
- 238000010672 photosynthesis Methods 0.000 description 1
- 230000000243 photosynthetic effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010117 shenhua Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- -1 thermal power plant Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/12—Unicellular algae; Culture media therefor
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M21/00—Bioreactors or fermenters specially adapted for specific uses
- C12M21/02—Photobioreactors
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- C12M21/00—Bioreactors or fermenters specially adapted for specific uses
- C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
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- C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
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Abstract
The invention discloses a kind of carbon dioxide underground sequestration methods based on coal mine gob, belong to carbon dioxide discharge-reduction field, by CO2The gaseous mixture of tail gas and air is as CO2In source injection both culturing microalgae unit, and the algae-containing water solution injection of acquisition is transformed by coal mine gob in the underground confined space formed, make separation of the microalgae from aqueous solution, then the water source from underground confined space extraction aqueous solution as both culturing microalgae unit；The present invention also provides a kind of carbon dioxide underground sequestration systems based on underground confined space.The present invention realizes the separation of microalgae and water using the underground confined space formed is transformed by coal mine gob, avoiding traditional both culturing microalgae needs to add the problem of flocculant causes water pollution and high separation costs, and microalgae is fixed in the confined space of underground, both having avoided traditional CCS technologies needs to build the high cost problem of injection well and monitoring well, CO will not occurs2Leakage problem, so as to fulfill CO2Inexpensive, safe and reliable emission reduction.
Description
Technical field
Patent of the present invention belongs to carbon dioxide discharge-reduction field, more particularly to a kind of carbon dioxide based on coal mine gob
Lower method of seal and seal system up for safekeeping.
Background technology
The problem of greenhouse gases effect is paid close attention to jointly as the current whole mankind, caused by global warming to from
The right ecosystem causes apparent influence.How while the economic continuous development with society, effectively control and reduction dioxy
Change the discharge of carbon isothermal chamber gas, be the Tough questions of countries in the world facing.China has disclosed promise to 2030 at present
Year CO2Discharge capacity is not further added by, and develops effective inexpensive CO2Emission-reduction technology become there is an urgent need to.
The endowment of resources condition in China's " few gas of the few oil of rich coal ", determines main body energy position of the coal in China very long
It will not change in a period of time.Coal trans-utilization process such as coal fired power generation, coal chemical industry, can all discharge a large amount of CO2.Coal
The CO that charcoal is faced using industry2Emission reduction is especially prominent.
Existing CO2Emission-reduction technology mainly includes CO2Trapping and seal (CCS) technology, afforestation and microalgae carbon sequestration up for safekeeping
Deng.
Wherein, CCS technologies are mainly by the CO in coal chemical industry tail gas or power-plant flue gas2After purification, noted by injection well
Enter to saline aquifer and sealed up for safekeeping, such as Shenhua Group has carried out 100,000 tons/year of CCS in Erdos (carbon dioxide is caught
Collect and seal up for safekeeping) Pilot trial research, whole process collecting carbonic anhydride is demonstrated with sealing up for safekeeping.However, CCS technologies are mainly deposited at present
Have in problems with：First, part experts and scholars think that CCS is only by CO2It seals up, there is no really realize CO2Subtract
It is few, it is not belonging to CO2Emission reduction；Secondly, CO2Trapping seal the CO for needing high-purity up for safekeeping2, general coal chemical industry, power plant emission
CO2Tail gas is all unsatisfactory for the requirement directly sealed up for safekeeping, it is necessary to additionally increase CO2Purification system or power plant is transformed, such as adopt
With IGCC power generations or oxygen-enriched combustion technology, CO can be all significantly increased in these2The cost of trapping；Again, CO2Underground sequestration exists
The possibility of spilling, security are still disputable.
Afforestation, especially for China Northwestern environment vulnerable areas, is not appropriate for dependent on specific environment, and sets
The plants such as wood can only be in slow-absorbing air CO2, limited by land area, dissolve CO2Total amount and human production activity
Discharge capacity ratio, it is extremely limited.
Microalgae carbon-fixation-technology is mainly consolidated using the characteristics of microalgae photosynthetic efficiency is high, breeding is fast, environmental suitability is strong
Determine CO2.Utilize the CO in tail gas2On the one hand cultivating microalgae realizes CO2Fixation, on the one hand extracted from the obtained microalgae of cultivation
The clean energy resourcies such as biodiesel.However.Main problem existing for microalgae carbon-fixation-technology is at present：Culture water used in both culturing microalgae
Microalgae concentration is low (being usually no more than 1wt%) in body (aqueous solution), and microalgae, which is separated from water out, to be needed to add a large amount of flocculants,
Water body can be caused to pollute；Still containing large quantity of moisture (more than 95wt%), it is necessary to fully dry in microalgae after precipitation separates
Grease therein could be extracted after dry, mass energy can be all consumed in this serial procedures, the energy consumed is long-range
It is economically infeasible in from obtaining the energy contained in the grease obtained in microalgae.
For this present situation, there is an urgent need to develop a kind of practicable low cost, safe and reliable CO2Emission-reduction technology.
The content of the invention
It is an object of the invention to provide a kind of carbon dioxide underground sequestration method and system based on coal mine gob, from
And realize CO2Inexpensive, safe and reliable emission reduction.
To achieve the above object, the present invention provides a kind of carbon dioxide underground sequestration method based on coal mine gob,
Comprise the following steps：
A, gas configuration：By CO2Tail gas is mixed to get mixed gas with air；
B, micro-algae propagation：The mixed gas obtained in step a is injected in both culturing microalgae unit, as both culturing microalgae unit
CO2Source is to breed microalgae；
C, goaf is transformed：Using the abandoned coal pillar in artificial dam body connection coal mine gob, underground confined space is formed；
D, microalgae is adsorbed：Algae-containing water solution after breeding microalgae in the both culturing microalgae unit is injected into underground confined air
Between, microalgae is adsorbed using the inbreak rock mass in the confined space of underground, so that microalgae is separated from aqueous solution；
E, draining：After microalgae absorption, extract aqueous solution out from the underground confined space and be supplemented to the both culturing microalgae
Unit, the water source as both culturing microalgae unit.
In the present invention, transform to form underground confined space, those skilled in the art using the goaf after coal mining
It is appreciated that due to being partly caving after mining etc. top plate, there are inbreak rock mass, applicant grinds the underground confined space
Study carefully discovery, above-mentioned inbreak rock mass has microalgae good suction-operated, and the present invention is exactly then to utilize above-mentioned inbreak rock mass pair
Microalgae suction-operated in algae-containing water solution, realizes the separation of microalgae.
In the step a of the present invention, CO used during gas preparation is carried out2Tail gas can be a variety of industrial discharges rich in CO2
Tail gas (such as thermal power plant, steel plant and coal chemical industry discharged when industrial plants are run rich in CO2Tail gas), be preferably electricity
Factory's flue gas, coal chemical engineering equipment arrange CO2The gaseous mixture of tail gas or the two, more preferably power-plant flue gas, power-plant flue gas and coalification
Frock puts arranged CO2The gaseous mixture of tail gas is most preferably power-plant flue gas.CO in these usual tail gas2Concentration and temperature are higher, example
Such as CO2Content be up to 15%~20% (V/V), since it is desired that being mixed with air, the CO2The mixed proportion of tail gas and air
With CO in the mixed gas that is obtained after mixing2Content meets both culturing microalgae requirement and is advisable, and suitable ratio is 1:0.1~1:100,
It is preferred that 1：1~1:20, particularly preferred 1:5~1:10.In a preferred embodiment, the CO2Tail gas is mixed with air
Before carried out pretreatment, to remove the ingredient being harmful in tail gas to both culturing microalgae, such as SO2、NO2Wait toxic gases.
The present invention step b in, carry out micro-algae propagation when, the type of microalgae used is not particularly limited, as green alga,
The speeds of growth such as cyanobacteria, diatom are fast, can fix CO2Microalgae can use use.It is preferred that selection and breeding have certain high temperature resistant,
Resisting high-concentration CO2, resistance to low concentration the characteristics such as toxic gas algae.
The both culturing microalgae unit is for breeding microalgae, so as to the CO in fixed tail gas2, specific both culturing microalgae mode
It is not particularly limited, can select both culturing microalgae unit commonly used in the art, such as the both culturing microalgae unit that can be open
Put formula cultivation apparatus, closed culture device or hybrid cultivation apparatus, such as raceway pond photo-biological commonly used in the art is anti-
Answer device, Airlift circulating bioreactor.
In the step c of the present invention, coal mine gob is transformed, to form underground confined space.Art technology
Personnel are appreciated that in coal mine gob, residual there are still by part working face protection pillar etc. the coal column set being stayed to be formed
Coal column is stayed, in order to form the underground confined space of annular in the coal mine gob, the artificial dam body pair of build can be passed through
Abandoned coal pillar (such as the lateral wall in tunnel, protection pillar etc.) in the coal mine gob is necessarily connected, to surround shape
Into the underground confined space.
The coal mine gob larger due to can generally form region after coal mining, method of seal according to the present invention,
Preferably, multiple underground confined spaces are formed when carrying out goaf transformation, between multiple underground confined spaces simultaneously or
The algae-containing water solution from both culturing microalgae unit is received in turn, and carries out correspondingly subsequent processing, takes full advantage of mining area underground
The working face of exploitation is more, facilitates the characteristics of forming multiple underground confined spaces, convenient for CO2Extensive, the continuous implementation sealed up for safekeeping, drop
It is low to seal cost up for safekeeping.
In the step d of the present invention, the algae-containing water solution after breeding microalgae in the both culturing microalgae unit is injected into underground
Confined space, it will be understood by those skilled in the art that microalgae density has been significantly increased in breeding rear solution, such as to reach this micro-
Microalgae contains in more than 80% or more than 90% or aqueous solution of microalgae maximal density of the algae cultivation unit under its breeding environment
When amount is more than 5g/L, generalized time efficiency cost, at this time it is contemplated that algae-containing water solution is injected underground confined space, to make
The both culturing microalgae unit can carry out micro-algae propagation next time.
The microalgae injected in the algae-containing water solution in the confined space of underground can be by inbreak rock mass in the confined space of underground etc.
The separation of microalgae in aqueous solution is realized in absorption.In the present invention, it is preferred to by being located at the top of the underground confined space
Water filling port injects algae-containing water solution.
In the step e of the present invention, extract aqueous solution out from the underground confined space and be supplemented to the both culturing microalgae list
Member, it will be understood by those skilled in the art that most microalgaes in aqueous solution have been attracted in the confined space of underground at this time.
A preferred embodiment according to the present invention, in CO2Before tail gas is mixed with air, by CO2Tail gas with it is close from underground in step e
Close the aqueous solution extracted out in space exchange heat or the mixed gas that obtains step a in step e from underground confined space
The aqueous solution of middle extraction exchanges heat, and makes to be suitable for microalgae into the temperature of the both culturing microalgae unit water source and/or mixed gas
Breeding.In the present invention, it is preferred to aqueous solution is extracted out by the discharge outlet for being located at the underground confined space bottom.
A preferred embodiment according to the present invention, the carbon dioxide underground sequestration method further include step f, anaerobism
Fermentation：After the underground confined space draining, the microalgae of absorption is made to carry out anaerobic fermentation in the confined space of underground, and will hair
For the combustible gas that ferment generates by extraction pipeline methane drainage and utilization project, the extraction pipeline is arranged at the top of the underground confined space simultaneously
Towards ground.It will be understood by those skilled in the art that underground confined space is natural anaerobic environment, the underground confined space
The microalgae of middle absorption can ferment wherein, obtain clean energy resourcies, the processes such as methane, hydrogen and dexterously make use of underground closed
Natural anaerobic environment in space makes energy conversion in microalgae, recycling convenient, at low cost.
A preferred embodiment according to the present invention, the carbon dioxide underground sequestration method further include step g, wait to take out
After adopting, algae-containing water solution, and repeatedly step d~f are refilled into the underground confined space, it is close so as to fulfill underground
Close the recycling in space.
The present invention also provides the carbon dioxide underground sequestration system based on coal mine gob, the carbon dioxide underground envelope
Deposit system includes：
Gas delivery unit, for making CO2Tail gas is mixed with air, and using obtained mixed gas as both culturing microalgae list
The CO of member2Source is supplied to both culturing microalgae unit；
Both culturing microalgae unit, for absorbing the CO in the mixed gas from the gas delivery unit2, and breed micro-
Algae；
At least one underground confined space, the underground confined space be by the abandoned coal pillar in the coal mine gob with
The artificial dam body for connecting the abandoned coal pillar surrounds the closed space formed, for receiving containing from the both culturing microalgae unit
Algae aqueous solution, and isolate the microalgae in the aqueous solution；
First conveying device is supported for sending the aqueous solution after the underground confined space separates microalgae back to the microalgae
Grow unit；With
Second conveying device, second conveying device are used to send the algae-containing water solution from the both culturing microalgae unit
Enter underground confined space.
It is according to the present invention to seal system up for safekeeping, it is preferable that at least one underground confined space is closed for multiple undergrounds
Space, multiple underground confined spaces are molten for simultaneously or alternately receiving the algae-containing water from the both culturing microalgae unit
Liquid.
It is according to the present invention to seal system up for safekeeping, it is preferable that the top of the underground confined space is equipped with water filling port, for institute
State injection algae-containing water solution in the confined space of underground；The bottom of the underground confined space is equipped with discharge outlet, is separated for discharging
Aqueous solution after microalgae.
It is according to the present invention to seal system up for safekeeping, it is preferable that the both culturing microalgae unit is arranged on the underground confined space
In the earth's surface of side.It will be understood by those skilled in the art that discharge CO2Region be industrial area mostly, although microalgae photosynthesis
It is efficient, but microdisk electrode stills need substantial amounts of land area, and industrial area is difficult to meet, and due to facility of mining area ground itself
It is few, the both culturing microalgae unit is arranged in the earth's surface in the underground confined space location, not only solves system footprint
Problem, while also allow for system operatio operation.
It is according to the present invention to seal system up for safekeeping, it is preferable that the carbon dioxide underground sequestration system further includes heat exchange unit, institute
Heat exchange unit is stated for making the aqueous solution of the first conveying device conveying and treating the CO into the gas delivery unit2Tail gas
Heat exchange or the mixed gas for making the aqueous solution of the first conveying device conveying and being drawn from the gas delivery unit
Heat exchange.
It is according to the present invention to seal system up for safekeeping, it is preferable that the top of the underground confined space is equipped with the gas towards ground
Extraction pipeline, for the separated microalgae of the extraction combustible gas that anaerobic fermentation is produced in the underground confined space.
Compared with prior art, the present invention has the following advantages：
1st, China coal-producing area is concentrated mainly on western part, and a large amount of pit-head power stations and Modern Coal-based Chemical enterprise also accordingly concentrate on
West area.It is scarcely populated since west area sunshine is sufficient, it is suitble to carry out CO using microalgae carbon sequestration mode2Trapping and envelope
It deposits, the present invention is based on the underground confined spaces that coal goaf (west area largely exists) is formed, and utilize wherein inbreak rock mass
Suction-operated realize efficiently separating for microalgae and water, so as to avoid when separating microalgae in traditional microalgae carbon-fixation-technology by
In addition flocculant and caused by water pollution, separation costs are high and economy on infeasible problem.
2nd, for the present invention by setting heat exchange unit, the waste heat for taking full advantage of power-plant flue gas is pre- to underground confined space water body
Heat realizes the recycling of fume afterheat and solves the water extracted out from underground confined space to the temperature of optimum algae cultivation
The drawbacks of temperature may be relatively low.
3rd, algae is fixed in the underground confined space of coal mine gob formation by the present invention, save it is substantial amounts of build into
This, realizes the recycling in goaf, and both having avoided traditional CCS technologies needs the high cost of construction injection well and monitoring well to ask
Topic, also there is no tradition CCS to seal CO up for safekeeping2Afterwards it is also possible that CO2Leakage problem, so as to fulfill CO2Low cost, safety can
The emission reduction leaned on.
4th, the present invention can also utilize anaerobic environment natural in the confined space of underground to realize the anaerobic fermentation of microalgae, obtain
The clean energy resourcies such as methane, hydrogen, conversion are convenient, at low cost.
5th, the present invention injects algae-containing water solution in the confined space of underground, in addition to it can efficiently separate microalgae, extraction
Aqueous solution also rots the remaining benefit materials of institute dissolved with contained in inbreak rock mass in the confined space of underground and microalgae, favorably
The breeding of microalgae, achieves many things at one stroke in both culturing microalgae unit.
Description of the drawings
Fig. 1 is a kind of schematic diagram of embodiment of the carbon dioxide sequestration system of the present invention；
Fig. 2 is a kind of schematic diagram of embodiment of the underground confined space used in the present invention.
Specific embodiment
Below with reference to attached drawing, the present invention is described in detail, but the present invention is not limited to this.
As shown in Figure 1, the carbon dioxide underground sequestration system of the present invention includes gas delivery unit 2, both culturing microalgae unit
3rd, at least one underground confined space 1, the first conveying device 4 and the second conveying device 5.Wherein, the gas delivery unit 2 is used
In by CO2Tail gas is mixed with air, and provides the mixed gas available for both culturing microalgae to both culturing microalgae unit 3；The gas
Dispatching unit 2 can be the common gas mixing apparatus of ability, such as gas mixing tank etc..
The both culturing microalgae unit 3 is for the CO in mixed gas of the absorption from the gas delivery unit 22, and
Microalgae is bred in aqueous solution；The both culturing microalgae unit 3 can select both culturing microalgae unit commonly used in the art, such as described micro-
Algae cultivation unit 3 can be open cultivation device, closed culture device or hybrid cultivation apparatus, specifically such as raceway pond
Bioreactor, Airlift circulating bioreactor.
The underground confined space 1 is by the abandoned coal pillar in the coal mine gob and the people for being connected the abandoned coal pillar
Work dam body surrounds the closed space formed, in one embodiment, single or multiple Adjacent Working Faces can be selected to transform as
Underground confined space specifically, the underground confined space to be formed is transformed for single working face, as shown in Fig. 2, by working face 11
The lateral wall 15 in the tunnel 111,112 of both sides and both ends (i.e. lateral wall 15 and work of the return channel 113 close to main entry 12 of working face
The initiating terminal 13 of 11 back production of face) four walls as underground confined space 1, above-mentioned four wall is necessarily connected by artificial dam body
It connects to surround underground confined space 1 (dash area).Same reason, the underground formed for multiple Adjacent Working Faces are closed
Space, by the lane of the outermost (outermost refers to the leftmost side and the rightmost side of multiple Adjacent Working Faces) of multiple Adjacent Working Faces
Four walls of the both ends of road lateral wall and multiple Adjacent Working Faces as underground confined space, so as to surround underground confined space.More than
" left side " " right side " that is used in description refers to the direction in attached drawing.
The underground confined space 1 isolates institute for receiving the algae-containing water solution from the both culturing microalgae unit 3
State the microalgae in aqueous solution.Preferably, the top of the underground confined space 1 is equipped with water filling port 8, from the both culturing microalgae list
The algae-containing water solution of member 3 is injected by the water filling port 8 in the underground confined space 1.
In a preferred embodiment, at least one underground confined space 1 be multiple underground confined spaces, example
Such as 2~6 underground confined spaces, multiple underground confined spaces can be received simultaneously or alternately from the both culturing microalgae
The algae-containing water solution of unit 3 improves treatment effeciency.
First conveying device 4 is used to send back to the aqueous solution after the underground confined space 1 separates microalgae described
Both culturing microalgae unit 3.First conveying device 4 can be liquid transporting apparatus commonly used in the art, and which is not described herein again.It is excellent
Selection of land, the bottom of the underground confined space 1 are equipped with discharge outlet 9, and first conveying device 4 is extracted out by the discharge outlet 9
Aqueous solution.It will be understood by those skilled in the art that due to existing inbreak rock mass 7 (such as spoil) etc. in underground confined space 1,
The aqueous solution of extraction is in fact by the filtering of the filter layer formed by inbreak rock mass 7, therefore water quality is guaranteed.In a kind of implementation
In mode, the carbon dioxide underground sequestration system further includes heat exchange unit (not shown), and the heat exchange unit is used to make
The aqueous solution and treat the CO into the gas delivery unit 2 that first conveying device 4 conveys2Tail gas is exchanged heat or is used for
Make the aqueous solution of the first conveying device conveying 4 and the heat transfer of mixture gas drawn from the gas delivery unit 2, make entrance
The temperature of 3 water source of both culturing microalgae unit and/or mixed gas is suitable for micro-algae propagation.The heat exchange unit can be this field
Common heat exchanger, which is not described herein again.
Second conveying device 5 is used to that the water filling will to be passed through from the algae-containing water solution of the both culturing microalgae unit 3
Mouth 8 is sent into underground confined spaces 1.Second conveying device 5 can be liquid transporting apparatus commonly used in the art, here no longer
It repeats.Preferably, the both culturing microalgae unit 3 is arranged in the earth's surface in 1 location of underground confined space, can not only be solved
The certainly occupation of land problem of both culturing microalgae unit 3, while also allow for system operatio operation.
Due to having natural anaerobic environment in underground confined space 1, in a preferred embodiment, the underground is closed
The top in space 1 is equipped with the gas extraction pipeline 6 towards ground, for the separated microalgae of extraction in the underground confined space 1
The combustible gas that interior anaerobic fermentation is produced, such as methane and hydrogen etc..
During operation, from extraneous CO2Tail gas and air are prepared through gas after unit 2 mixes, into both culturing microalgae unit
3, micro-algae propagation is carried out to fix CO2.When microalgae density reaches a certain level in algae-containing water solution, pass through the second conveying device
5 inject the algae-containing water solution in underground confined space 1, are inhaled using existing inbreak rock mass 7 in the underground confined space 1
Attached microalgae realizes the separation of microalgae in aqueous solution, then by the first conveying device 4 by the aqueous solution in underground confined space 1
Extraction, and finally return that both culturing microalgae unit 3.
After draining, microalgae is attracted in underground confined space 1, due in the confined space of underground 1 natural anaerobic environment,
So that microalgae anaerobic fermentation in underground confined space 1, and the clean energy resourcies such as the methane of acquisition, hydrogen are passed through into gas drainage tube
The extraction of road 6 utilizes.After extraction, algae-containing water solution is injected into underground confined space 1 again, and carries out microalgae absorption.When
When underground confined space 1 is multiple, the plurality of underground confined space can be received simultaneously or alternately from the both culturing microalgae list
The algae-containing water solution of member 3, other operations are identical.
In addition, the carbon dioxide underground sequestration method based on underground confined space of the present invention, comprises the following steps：
A, gas configuration：By CO2Tail gas is mixed to get mixed gas with air；
B, micro-algae propagation：The mixed gas obtained in step a is injected in both culturing microalgae unit, as both culturing microalgae unit
CO2Source is to breed microalgae；
C, goaf is transformed：Using the abandoned coal pillar in artificial dam body connection coal mine gob, underground confined space is formed；
D, microalgae is adsorbed：Algae-containing water solution after breeding microalgae in the both culturing microalgae unit is injected into underground confined air
Between, microalgae is adsorbed using the inbreak rock mass in the confined space of underground, so that microalgae is separated from aqueous solution；
E, draining：After microalgae absorption, extract aqueous solution out from the underground confined space and be supplemented to the both culturing microalgae
Unit, the water source as both culturing microalgae unit.
In a preferred embodiment, the carbon dioxide underground sequestration method further includes step f, anaerobic fermentation：It treats
After the underground confined space emptying aqueous solution, the microalgae of absorption is made to carry out anaerobic fermentation in the confined space of underground, and will hair
For the combustible gas that ferment generates by extraction pipeline methane drainage and utilization project, the extraction pipeline is arranged at the top of the underground confined space simultaneously
Towards ground.In further preferred embodiment, the carbon dioxide underground sequestration method further includes step g, treats extraction
After, algae-containing water solution is refilled into the underground confined space, and repeats step d~f.
Embodiment
After the water heat exchange that certain power-plant flue gas is extracted with 1 discharge outlet of underground confined space formed in coal mine gob, with sky
Gas presses 1：10 are mixed to get CO2The mixed gas of concentration about 2% or so, oxygen concentration about 19%, and it is sent into both culturing microalgae unit 3
In, carry out micro-algae propagation.When the concentration of microalgae in algae-containing water solution is more than 5g/L, algae-containing water solution is passed through into 8 note of water filling port
Enter underground confined space 1, after inbreak rock mass 7 in underground confined space 1 is adsorbed, filtered, from the draining of underground confined space 1
The aqueous solutions of mouth 9 out are substantially free of microalgae, and microalgae is mainly attracted in the inbreak rock mass 7 of underground confined space 1, realize
To CO2Fixation.
Claims (14)
1. a kind of carbon dioxide underground sequestration method based on coal mine gob, comprises the following steps：
A, gas configuration：By CO2Tail gas is mixed to get mixed gas with air；
B, micro-algae propagation：The mixed gas obtained in step a is injected in both culturing microalgae unit, the CO as both culturing microalgae unit2
Source is to breed microalgae；
C, goaf is transformed：Using the abandoned coal pillar in artificial dam body connection coal mine gob, underground confined air is formed to surround
Between；
D, microalgae is adsorbed：Algae-containing water solution after breeding microalgae in the both culturing microalgae unit is injected into underground confined space, profit
Microalgae is adsorbed with the inbreak rock mass in the confined space of underground, so that microalgae is separated from aqueous solution；
E, draining：After microalgae absorption, extract aqueous solution out from the underground confined space and be supplemented to the both culturing microalgae unit,
Water source as both culturing microalgae unit.
2. carbon dioxide underground sequestration method according to claim 1, which is characterized in that the carbon dioxide underground sequestration
Method further includes step f, anaerobic fermentation：After the underground confined space draining, make the microalgae of absorption in underground confined space
Interior carry out anaerobic fermentation, and the combustible gas generated that will ferment, by extraction pipeline methane drainage and utilization project, the extraction pipeline is arranged at institute
It states the top of underground confined space and leads to ground.
3. carbon dioxide underground sequestration method according to claim 2, which is characterized in that the carbon dioxide underground sequestration
Method further includes step g, treat extraction after, algae-containing water solution is refilled into the underground confined space, and repeats to walk
Rapid d~f.
4. carbon dioxide underground sequestration method according to any one of claim 1-3, which is characterized in that in step c
When carrying out goaf transformation, multiple underground confined spaces are formed, are simultaneously or alternately connect between multiple underground confined spaces
Receive the algae-containing water solution from the both culturing microalgae unit.
5. carbon dioxide underground sequestration method according to claim 1, which is characterized in that the CO in step a2Tail gas and sky
Before gas mixing, by CO2Tail gas exchanges heat with the aqueous solution extracted out in step e from the confined space of underground,
Or the mixed gas that step a is obtained is exchanged heat with the aqueous solution extracted out in step e from the confined space of underground.
6. carbon dioxide underground sequestration method according to claim 1, which is characterized in that in step d, by being located at
State the water filling port injection algae-containing water solution at the top of the confined space of underground；
In step e, aqueous solution is extracted out by the discharge outlet for being located at the underground confined space bottom.
7. carbon dioxide underground sequestration method according to claim 1, which is characterized in that the CO2Tail gas is power plant's cigarette
Gas, coal chemical engineering equipment arrange CO2The gaseous mixture of tail gas or the two.
8. a kind of carbon dioxide underground sequestration system based on coal mine gob, the carbon dioxide underground sequestration system include：
Gas delivery unit, for making CO2Tail gas is mixed with air, and using obtained mixed gas as both culturing microalgae unit
CO2Source is supplied to both culturing microalgae unit；
Both culturing microalgae unit, for absorbing the CO in the mixed gas from the gas delivery unit2, and breed microalgae；
At least one underground confined space, the underground confined space are by the abandoned coal pillar in the coal mine gob and connection
The artificial dam body of the abandoned coal pillar surrounds the closed space formed, for receiving the algae-containing water from the both culturing microalgae unit
Solution, and isolate the microalgae in the aqueous solution；
First conveying device, for sending the aqueous solution after the underground confined space separates microalgae back to the both culturing microalgae list
Member；With
Second conveying device, second conveying device are used to be sent into ground from the algae-containing water solution of the both culturing microalgae unit
Lower confined space.
9. carbon dioxide underground sequestration system according to claim 8, which is characterized in that at least one underground is close
Space is closed as multiple underground confined spaces, multiple underground confined spaces come from the microalgae for simultaneously or alternately receiving
Cultivate the algae-containing water solution of unit.
10. carbon dioxide underground sequestration system according to claim 8 or claim 9, which is characterized in that the underground confined space
Top be equipped with water filling port, for into the underground confined space inject algae-containing water solution；The bottom of the underground confined space
Portion is equipped with discharge outlet, for discharging the aqueous solution after separating microalgae.
11. carbon dioxide underground sequestration system according to claim 8, which is characterized in that the both culturing microalgae unit is set
It is placed in the earth's surface above the confined space of underground.
12. carbon dioxide underground sequestration system according to claim 11, which is characterized in that the both culturing microalgae unit is
Raceway pond bioreactor or Airlift circulating bioreactor.
13. carbon dioxide underground sequestration system according to claim 8, which is characterized in that the carbon dioxide underground envelope
Deposit system further includes heat exchange unit, and the heat exchange unit is used to make the aqueous solution of the first conveying device conveying and institute to be entered
State the CO of gas delivery unit2Tail gas exchange heat or for make the aqueous solution of first conveying device conveying with from the gas
The heat transfer of mixture gas that body dispatching unit is drawn.
14. carbon dioxide underground sequestration system according to claim 8, which is characterized in that the underground confined space
Top be equipped with towards ground gas extraction pipeline, for the separated microalgae of extraction in the underground confined space anaerobic fermentation
Generated combustible gas.
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| CN113404538B (en) * | 2021-06-30 | 2024-05-03 | 苗春光 | System and method for sealing carbon dioxide based on coal mine goaf |
| CN114159947B (en) * | 2021-11-29 | 2023-10-24 | 国家能源投资集团有限责任公司 | System for dredging goaf of water inlet of underground reservoir and reducing water salinity |
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| CN102767395A (en) * | 2012-07-23 | 2012-11-07 | 中国神华能源股份有限公司 | Anti-seepage method for mine underground reservoirs |
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