CN108775275A - Individual well closed cycle underground thermoelectric heat generation system and method - Google Patents
Individual well closed cycle underground thermoelectric heat generation system and method Download PDFInfo
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- CN108775275A CN108775275A CN201810525808.XA CN201810525808A CN108775275A CN 108775275 A CN108775275 A CN 108775275A CN 201810525808 A CN201810525808 A CN 201810525808A CN 108775275 A CN108775275 A CN 108775275A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/04—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using pressure differences or thermal differences occurring in nature
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 present invention relates to a kind of individual well closed cycle underground thermoelectric heat generation system and methods.The system includes：Defeated module outside pit shaft, fluid circulation module and electric energy.Pit shaft includes casing, oil pipe and thermoelectric generation module.The top of oil pipe is concordant with the top of casing, and bottom is located at the top in pit shaft shaft bottom and has gap between pit shaft shaft bottom.Thermoelectric generation module is connected by docking cable with defeated module outside electric energy.Space between internal surface of sleeve pipe and thermoelectric generation module outer wall forms oil jacket inventionannulus flow channel.Oil pipe inner space forms oil pipe flow channel.Fluid circulation module includes that cold fluid injection pipeline, cold fluid injection pump, cold fluid flow go out pipeline, cold fluid storage container, cold fluid inflow line, closed cycle outflow hot fluid and utilize module and closed cycle outflow fluid flow line.The present invention, which can realize, to be taken heat power generation not fetch water, provides stable electric energy supply, and does not interfere with the later use of heat exchanging fluid.
Description
Technical field
The invention belongs to geothermal power generation technical fields, and in particular to a kind of individual well closed cycle underground thermoelectric heat generation system
And method.
Background technology
Geothermal energy is a kind of clean green energy resource, because its stock number is big, production not climate condition influence, pollute it is small,
The advantages that sustainable.
Geothermal power generation technology mainly have dry saturated steam generation technology, geothermal water generation technology, combined cycle generation technology,
Dry-hot-rock geothermal generation technology etc..In current geothermal power generation technology, 27% uses dry saturated steam geothermal power generation, and 41% using single
Working medium flashes mode, and 20% flashes mode using double-work medium, and 1% uses back pressure turbine, and 11%, which uses ORC/ to combine, follows
Ring/hybrid mode.
With the progress of semi-conducting material manufacturing technology and technique in recent years, thermoelectric power generation technology is gradually risen.When half
When conductor both sides apply different temperature respectively, due to Seebeck effect, just it will produce between high temperature side and low temperature side electronic
Gesture.Using this phenomenon, thermal energy electric energy can be converted directly into using thermoelectric generation elements.Some are studies have shown that even if high
The temperature difference for only having 10 degrees Celsius between warm side and low temperature side, can also generate enough electric energy.
Invention content
For the productive prospecting of middle Low Temperature Thermal storage, present invention combination thermoelectric power generation technology proposes a kind of individual well closed cycle
Underground thermoelectric heat generation system and method, which, which can not only realize, takes heat power generation not fetch water, provides stable electric energy confession
It gives, but also does not interfere with the later use of heat exchanging fluid.
To achieve the above object, present invention employs following technical schemes：
The present invention relates to a kind of individual well closed cycle underground thermoelectric heat generation systems, including：Drill the well on geothermal well stratum
Defeated module outside cylinder, fluid circulation module and electric energy.
Specifically, the pit shaft includes casing, the embedded oil pipe being arranged in casing and is arranged on oil-pipe external wall
Thermoelectric generation module；The top of the oil pipe is concordant with the top of casing, and bottom is located at the top in pit shaft shaft bottom and and pit shaft
There is gap between shaft bottom；The thermoelectric generation module is connected by docking cable with defeated module outside the electric energy；In described sleeve pipe
Space between wall and thermoelectric generation module outer wall forms oil jacket inventionannulus flow channel；The oil pipe inner space forms oil pipe
Flow channel.
The fluid circulation module includes that cold fluid injection pipeline, cold fluid injection pump, cold fluid flow go out pipeline, cold flow
Body storage container, cold fluid inflow line, closed cycle outflow hot fluid flow out fluid flow pipe using module and closed cycle
Line；The outlet of the cold fluid injection pump is injected pipeline and flowed with oil jacket inventionannulus flow channel or oil pipe by cold fluid to be led to
Road is connected；The entrance of the cold fluid injection pump goes out pipeline by cold fluid flow and is connected with the outlet of cold fluid storage container；Institute
The entrance for stating cold fluid storage container flows out the outlet phase that hot fluid utilizes module by cold fluid inflow line and closed cycle
Even；When pipeline is injected in the outlet of cold fluid injection pump by cold fluid to be connected with oil jacket inventionannulus flow channel, the enclosed is followed
Circulation is gone out hot fluid and is connected with oil pipe flow channel by closed cycle outflow fluid flow line using the entrance of module；When
When the outlet of cold fluid injection pump is connected by cold fluid injection pipeline with oil pipe flow channel, the closed cycle outflow heat
Fluid flows out fluid flow line by closed cycle using the entrance of module and is connected with oil jacket inventionannulus flow channel.
Further, the pit shaft is the cell structure for drilling geothermal well stratum, solid to shaft bottom cementing using setting of casing
Well mode is realized；Described sleeve pipe and geothermal well stratum are closely cementing；The shaft bottom uses grout off.
Further, the thermoelectric generation module includes the thermoelectric generator that several groups are serially connected；The thermoelectric power generation
Machine includes several groups thermoelectric power generation unit；The thermoelectric power generation unit includes a N-type semiconductor and a P-type semiconductor, phase
N-type semiconductor and P-type semiconductor are alternately arranged between adjacent thermoelectric power generation unit.
Further, the cross section of described sleeve pipe and oil pipe is circle；Described sleeve pipe and oil pipe coaxial setting；It is described
The cross section of thermoelectric generation module is circular ring shape.
Further, the cold fluid injection pump and cold fluid storage container are respectively positioned on ground.
The invention further relates to a kind of thermoelectric power generation methods using above-mentioned individual well closed cycle underground thermoelectric heat generation system：
S1, when the outlet of cold fluid injection pump by cold fluid inject pipeline be connected with oil jacket inventionannulus flow channel when, this
Method includes the following steps：
S11, the cold fluid being stored in cold fluid storage container go out pipeline through cold fluid flow and enter cold fluid injection pump
After supercharging, pipeline is injected by cold fluid and enters oil jacket inventionannulus flow channel.
During S12, cold fluid flow downward along oil jacket inventionannulus flow channel, constantly heat, temperature are absorbed from surrounding formation
Degree gradually rises, and temperature reaches highest at shaft bottom, becomes high temperature fluid.
S13, since shaft bottom is by grout off, gap of the high temperature fluid between shaft bottom and oil pipe bottom enters oil pipe stream
In dynamic channel, and ground is flowed up to along oil pipe flow channel, flows out fluid flow line into closed cycle, then
Module is utilized into closed cycle outflow hot fluid, cold flow is returned to by cold fluid inflow line after heat exchange and utilization
In body storage container.
Low temperature in the high temperature fluid and oil jacket inventionannulus flow channel of S14, thermoelectric generation module in oil pipe flow channel
It is produced electricl energy under the action of temperature difference between fluid, and by docking cable by defeated module outside electric energy inputing power.
S2, when the outlet of cold fluid injection pump by cold fluid inject pipeline be connected with oil jacket inventionannulus flow channel when, this
Method includes the following steps：
S21, the cold fluid being stored in cold fluid storage container go out pipeline through cold fluid flow and enter the increasing of cold fluid injection pump
After pressure, pipeline is injected by cold fluid and enters oil pipe flow channel.
S22, cold fluid are during oil pipe flow channel flows downward, the hot fluid from oil jacket inventionannulus flow channel
Middle absorption partial heat, temperature are kept low.
After S23, fluid reach shaft bottom, since shaft bottom is by grout off, from the fluid that oil pipe flow channel flows out from shaft bottom
Gap between oil pipe bottom enters in oil jacket inventionannulus flow channel, and is flowed up to along oil jacket inventionannulus flow channel
Fluid flow line is flowed out in ground into closed cycle, module is utilized subsequently into closed cycle outflow hot fluid, through overheat
It exchanges and is returned in cold fluid storage container by cold fluid inflow line after utilizing.
S24, fluid constantly carry out heat exchange during oil jacket inventionannulus flow channel flows up with surrounding formation,
At same depth, the fluid temperature (F.T.) in oil jacket inventionannulus flow channel is higher than the fluid temperature (F.T.) in oil pipe flow channel, thermoelectric power generation
The work of the temperature difference between cryogen in high temperature fluid and oil pipe flow channel of the module in oil jacket inventionannulus flow channel
It is produced electricl energy under, and by docking cable by defeated module outside electric energy inputing power.
Further, the cold fluid is any one in water, liquid carbon dioxide, liquid nitrogen.
Compared to the prior art, beneficial effects of the present invention are：
(1) present invention uses fluid closed cycle mode to realize underground and takes heat power generation not fetch water, avoid traditional underground heat
In production process the problems such as potential stratum settlement, pit shaft fouling.
(2) present invention realizes generating power downhole using the electrothermal module for being arranged in underground.
(3) in the present invention, the fluid recycled after generating power downhole can be used for after being exchanged heat by ground floor heating,
The applications such as cultivation, bathing.
It takes heat power generation not fetch water in conclusion the present invention can not only realize, stable electric energy supply is provided, but also not
It can influence the later use of heat exchanging fluid.
Description of the drawings
Fig. 1 is the structural schematic diagram of individual well closed cycle underground thermoelectric heat generation system in embodiment one；
Fig. 2 is the I-I ' cross-sectional views of Fig. 1；
Fig. 3 is the structural schematic diagram of individual well closed cycle underground hot spot electricity generation system in embodiment two.
Wherein：
101, geothermal well stratum, 102, casing, 103, thermoelectric generation module, 104, oil pipe, 105, shaft bottom, 106, pit shaft,
200, fluid circulation module, 201, cold fluid inject pipeline, 202, cold fluid injection pump, 203, cold fluid flow go out pipeline, 204,
Cold fluid storage container, 205, cold fluid inflow line, 206, closed cycle outflow hot fluid utilize module, 207, enclosed follows
Circulation goes out fluid flow line, and 301, docking cable, 302, defeated module outside electric energy, 401, oil jacket inventionannulus flow channel, 402, oil
Pipe flow channel.
Specific implementation mode
The present invention will be further described below in conjunction with the accompanying drawings：
Embodiment one
A kind of individual well closed cycle underground thermoelectric heat generation system as shown in Figure 1, including：Drill the well on geothermal well stratum
Defeated module 302 outside cylinder 106, fluid circulation module 200 and electric energy.
Specifically, the thousands of rice of 101 deepening of geothermal well stratum, formation temperature is in continuously decrease from bottom to up
Gesture.The pit shaft 106 is the cell structure for drilling geothermal well stratum 101, using setting of casing 102 to 105 cementing well of shaft bottom
Mode is completed.Described sleeve pipe 102 is close cementing with geothermal well stratum 101, completely cuts off with formation fluid.Shaft bottom 105 is sealed using cement
It is stifled, prevent formation fluid from entering pit shaft 106.Right over 104 lower going-into-well bottom of oil pipe 105,104 outer wall of oil pipe and 102 part of casing
Form oil jacket inventionannulus flow channel 401.104 inner space of oil pipe forms oil pipe flow channel 402.Thermoelectric generation module 103 is tight
It is close to be fixedly arranged on 104 outer wall of oil pipe, in 104 tripping in casing 102 of oil pipe.
Further, the fluid circulation module 200 include cold fluid injection pipeline 201, it is cold fluid injection pump 202, cold
Fluid effuser line 203, cold fluid storage container 204, cold fluid inflow line 205, closed cycle outflow hot fluid utilize mould
Block 206 and closed cycle flow out fluid flow line 207.The cold fluid injection pump 202 and cold fluid storage container 204
In ground.The entrance of cold fluid injection pump 202 goes out outlet phase of the pipeline 203 with cold fluid storage container 204 by cold fluid flow
Even.The outlet of cold fluid injection pump 202 injects pipeline 201 by cold fluid and is connected with oil jacket inventionannulus flow channel 401.It is described
The entrance of cold fluid storage container flows out the outlet phase that hot fluid utilizes module by cold fluid inflow line and closed cycle
Even.Closed cycle outflow hot fluid using module 206 entrance by closed cycle flow out fluid flow line 207 with
Oil pipe flow channel 402 is connected.
Further, the thermoelectric generation module 103 is connected by docking cable 301 with defeated module 302 outside electric energy,
Electric energy is provided a user by defeated module 302 outside electric energy.
Further, as shown in Fig. 2, the cross section of the oil pipe 104 and casing 102 is circle.Described sleeve pipe 102
It is coaxially disposed with oil pipe 104.The cross section of the thermoelectric generation module 103 is circular ring shape.
Further, the thermoelectric generation module 103 is connected in series by several groups thermoelectric generator；Described is several
Group thermoelectric generator can be 1 group, 10 groups, 100 groups, can also be arbitrary multigroup；The thermoelectric generator is by several N
Type semiconductor and several P-type semiconductors assemble according to alternating, pairs of arrangement mode；One N-type semiconductor and a P
Type semiconductor constitutes a thermoelectric power generation unit；Described several N-type semiconductors and several P-type semiconductors can be 1
It is a, 10,100, can also be any number of；N-type semiconductor quantity and P-type semiconductor quantity are equal.
Further, the cold fluid is water, liquid carbon dioxide, liquid nitrogen.
The operation principle of the system is：
Cold fluid injection pump 202 after the cold fluid supercharging of self cooling fluid-storing container 204, is injected in the future by cold fluid
Pipeline 201 injects in oil jacket inventionannulus flow channel 401.It is flowed to along oil jacket inventionannulus flow channel 401 through cold fluid after supercharged
Shaft bottom 105.During cold fluid flows downward along oil jacket inventionannulus flow channel 401, constantly heat is absorbed from surrounding formation
Amount, cooling fluid temperature gradually rise, and become high temperature fluid, i.e. hot fluid.Since shaft bottom 105 is by grout off, from surrounding formation
Absorbing the hot fluid after heat can only enter from the gap between 104 bottom of oil pipe and shaft bottom 105 in oil pipe flow channel 402,
Pit shaft is flowed upwards out then along oil pipe flow channel 402.Since the fluid flowed up in oil pipe flow channel 402 is to inhale
The fluid after surrounding formation heat is heated is received, and the fluid to flow downward in oil jacket inventionannulus flow channel 401 is flowing over
It is constantly to absorb the process that heat is gradually heated from surrounding formation in journey, therefore, in same depth, oil pipe flow channel
Fluid temperature (F.T.) in 402 is higher than the fluid temperature (F.T.) in oil jacket inventionannulus flow channel 401.Fluid in oil pipe flow channel 402 is
Thermoelectric generation module 103 provides heat source, becomes the high temperature hot junction of thermoelectric generation module 103；In oil jacket inventionannulus flow channel 401
Fluid be thermoelectric generation module 103 low-temperature receiver is provided, become the low temperature cold end of thermoelectric generation module 103.Thermoelectric generation module
The temperature between fluid temperature (F.T.) in 103 fluid temperature (F.T.) and oil pipe flow channel 402 in oil jacket inventionannulus flow channel 401
It is produced electricl energy under the action of difference.The hot fluid flowed out from oil pipe flow channel 402 flows out fluid flow pipe by closed cycle
Line 207 enters closed cycle outflow hot fluid and utilizes module 206, is passed through in closed cycle outflow hot fluid is using module 206
After crossing sufficient heat exchange and becoming cold fluid after utilizing, cold fluid storage container 204 is entered by cold fluid inflow line 205
In.Cold fluid storage container 204, cold fluid flow go out pipeline 203, cold fluid injection pump 202, cold fluid injection pipeline 201, oil
Cover annular space flow channel 401, oil pipe flow channel 402, closed cycle outflow fluid flow line 207, closed cycle outflow heat
Fluid constitutes the fluid circulating system of an enclosed using module 206 and cold fluid inflow line 205, is thermoelectric generation module 9
Lasting cold energy and thermal energy are provided, realize generating power downhole.
The implementation method of individual well closed cycle underground thermoelectric heat generation system in the present embodiment is：
(1) oil well selected high-temperature geothermal well or discarded because aqueous high, using grout off shaft bottom；According to it
Outer wall is consolidated with the oil pipe 104 of thermoelectric generation module 103 above shaft bottom 105 by 105 depth of shaft bottom.
(2) it is sequentially connected cold fluid storage container 204, cold fluid flow goes out pipeline 203, cold fluid injection pump 202 and cold flow
Body injects pipeline 201, and cold fluid injection pipeline 201 is connected with oil jacket inventionannulus flow channel 401；By oil pipe flow channel
402 flow out fluid flow line 207 by closed cycle is connected with closed cycle outflow hot fluid using module 206；Enclosed is followed
Circulation goes out hot fluid and is connected to cold fluid storage container 204 by cold fluid inflow line 205 using module 206, to constitute
The fluid circulating system of one closure.
(3) thermoelectric generation module 103 is connected by docking cable 301 with defeated module 302 outside electric energy, constitutes an electricity
Road system.
(4) cold fluid being stored in cold fluid storage container 204 goes out pipeline 203 through cold fluid flow and enters cold fluid note
After entering 202 supercharging of pump, pipeline 201 is injected by cold fluid and enters oil jacket inventionannulus flow channel 401.
(5) during cold fluid flows downward along oil jacket inventionannulus flow channel 401, heat constantly is absorbed from surrounding formation,
Temperature gradually rises, and temperature reaches highest at shaft bottom 105, becomes high temperature fluid.
(6) since shaft bottom 105 is by grout off, high temperature fluid from the space between 104 bottom of shaft bottom 105 and oil pipe into
Enter in oil pipe flow channel 402, and ground is flowed up to along oil pipe flow channel 402, flows out fluid into closed cycle
Flowline 207 utilizes module 206 subsequently into closed cycle outflow hot fluid, passes through cold flow after heat exchange and utilization
Body inflow line 205 returns in cold fluid storage container 204.
(7) high temperature fluid and oil jacket inventionannulus flow channel 401 of the thermoelectric generation module 103 in oil pipe flow channel 402
In cryogen between temperature difference under the action of produce electricl energy, and will be defeated outside electric energy inputing power by docking cable 301
Module 302.
Embodiment two
As shown in figure 3, in individual well closed cycle underground thermoelectric heat generation system in the present embodiment, cold fluid injection pump
Outlet by cold fluid inject pipeline be connected with oil pipe flow channel, closed cycle outflow hot fluid using module entrance
Fluid flow line is flowed out by closed cycle with oil jacket inventionannulus flow channel to be connected, the other structures of the thermoelectric heat generation system
With embodiment one.
The implementation method of individual well closed cycle underground thermoelectric heat generation system in the present embodiment is：
(1) oil well selected high-temperature geothermal well or discarded because aqueous high, using grout off shaft bottom；According to it
Outer wall is consolidated with the oil pipe 104 of thermoelectric generation module 103 above shaft bottom 105 by 105 depth of shaft bottom.
(2) it is sequentially connected cold fluid storage container 204, cold fluid flow goes out pipeline 203, cold fluid injection pump 202 and cold flow
Body injects pipeline 201, and cold fluid injection pipeline 201 is connected with oil pipe flow channel 402；By oil jacket inventionannulus flow channel
401 flow out fluid flow line 207 by closed cycle is connected with closed cycle outflow hot fluid using module 206；Enclosed is followed
Circulation goes out hot fluid and is connected to cold fluid storage container 204 by cold fluid inflow line 205 using module 206, to constitute
The fluid circulating system of one closure.
(3) thermoelectric generation module 103 is connected by docking cable 301 with defeated module 302 outside electric energy, constitutes an electricity
Road system.
(4) cold fluid being stored in cold fluid storage container 204 goes out pipeline 203 through cold fluid flow and enters cold fluid note
After entering 202 supercharging of pump, pipeline 201 is injected by cold fluid and enters oil pipe flow channel 402.
(5) cold fluid is during oil pipe flow channel 402 flows downward, the heat from oil jacket inventionannulus flow channel 401
Partial heat is absorbed in fluid, temperature is kept low.
(6) after fluid reaches shaft bottom 105, since shaft bottom 105 is by grout off, from the stream of the outflow of oil pipe flow channel 402
Body enters from the space between 104 bottom of shaft bottom 105 and oil pipe in oil jacket inventionannulus flow channel 401, and along oil jacket Annular cutting
Dynamic channel 401 flows up to ground, flows out fluid flow line 207 into closed cycle, is flowed out subsequently into closed cycle
Hot fluid utilizes module 206, and cold fluid storage container is returned to by cold fluid inflow line 205 after heat exchange and utilization
In 204.
(7) fluid constantly carries out heat exchange during oil jacket inventionannulus flow channel 401 flows up with surrounding formation,
At same depth, the fluid temperature (F.T.) in oil jacket inventionannulus flow channel 401 is higher than the fluid temperature (F.T.) in oil pipe flow channel 402,
Low temperature stream in high temperature fluid and oil pipe flow channel 402 of the thermoelectric generation module 103 in oil jacket inventionannulus flow channel 401
It is produced electricl energy under the action of temperature difference between body, and by docking cable 301 by defeated module 302 outside electric energy inputing power.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
It encloses and is defined, under the premise of not departing from design spirit of the present invention, technical side of the those of ordinary skill in the art to the present invention
The various modifications and improvement that case is made should all be fallen into the protection domain of claims of the present invention determination.
Claims (7)
1. individual well closed cycle underground thermoelectric heat generation system, which is characterized in that including：Drill pit shaft, the fluid on geothermal well stratum
Defeated module outside loop module and electric energy；
The pit shaft includes casing, the embedded oil pipe being arranged in casing and the thermoelectric power generation mould being arranged on oil-pipe external wall
Block；The top of the oil pipe is concordant with the top of casing, and bottom is located at the top in pit shaft shaft bottom and has time between pit shaft shaft bottom
Gap；The thermoelectric generation module is connected by docking cable with defeated module outside the electric energy；Described sleeve pipe inner wall and thermoelectric power generation
Space between module outer wall forms oil jacket inventionannulus flow channel；The oil pipe inner space forms oil pipe flow channel；
The fluid circulation module includes cold fluid injection pipeline, cold fluid injection pump, cold fluid flow goes out pipeline, cold fluid stores
Container, cold fluid inflow line, closed cycle outflow hot fluid flow out fluid flow line using module and closed cycle；It is described
The outlet of cold fluid injection pump injects pipeline by cold fluid and is connected with oil jacket inventionannulus flow channel or oil pipe flow channel；Institute
The entrance for stating cold fluid injection pump goes out pipeline by cold fluid flow and is connected with the outlet of cold fluid storage container；The cold fluid storage
The entrance for depositing container is connected with closed cycle outflow hot fluid using the outlet of module by cold fluid inflow line；Work as cold fluid
When the outlet of injection pump is connected by cold fluid injection pipeline with oil jacket inventionannulus flow channel, the closed cycle flows out hot fluid
Fluid flow line is flowed out using the entrance of module by closed cycle with oil pipe flow channel to be connected；When cold fluid injection pump
When outlet is connected by cold fluid injection pipeline with oil pipe flow channel, the closed cycle outflow hot fluid entering using module
Mouth flows out fluid flow line by closed cycle and is connected with oil jacket inventionannulus flow channel.
2. individual well closed cycle according to claim 1 underground thermoelectric heat generation system, which is characterized in that the pit shaft is to bore
The cell structure for wearing geothermal well stratum is realized using setting of casing to shaft bottom cementing well mode；Described sleeve pipe is with geothermal well
Layer is close cementing.
3. individual well closed cycle according to claim 1 underground thermoelectric heat generation system, which is characterized in that the thermoelectric power generation
Module includes the thermoelectric generator that several groups are serially connected；The thermoelectric generator includes several groups thermoelectric power generation unit；It is described
Thermoelectric power generation unit includes a N-type semiconductor and a P-type semiconductor, N-type semiconductor between adjacent thermoelectric power generation unit
It is alternately arranged with P-type semiconductor.
4. individual well closed cycle according to claim 1 underground thermoelectric heat generation system, it is characterised in that：Described sleeve pipe and oil
The cross section of pipe is circle；Described sleeve pipe and oil pipe coaxial setting；The cross section of the thermoelectric generation module is circular ring shape.
5. individual well closed cycle according to claim 1 underground thermoelectric heat generation system, which is characterized in that the cold fluid note
Enter pump and cold fluid storage container is respectively positioned on ground.
6. a kind of thermoelectricity using the individual well closed cycle underground thermoelectric heat generation system described in Claims 1 to 5 any one is sent out
Method for electrically, which is characterized in that
S1, when the outlet of cold fluid injection pump by cold fluid inject pipeline be connected with oil jacket inventionannulus flow channel when, this method
Include the following steps：
S11, the cold fluid being stored in cold fluid storage container go out pipeline through cold fluid flow and enter the supercharging of cold fluid injection pump
Afterwards, pipeline is injected by cold fluid and enters oil jacket inventionannulus flow channel；
During S12, cold fluid flow downward along oil jacket inventionannulus flow channel, constantly from surrounding formation absorb heat, temperature by
Edge up height, and temperature reaches highest at shaft bottom, becomes high temperature fluid；
S13, since shaft bottom is by grout off, gap of the high temperature fluid between shaft bottom and oil pipe bottom enters oil pipe flow channel
In, and ground is flowed up to along oil pipe flow channel, fluid flow line is flowed out into closed cycle, subsequently into enclosed
Cycle outflow hot fluid utilizes module, and cold fluid storage container is returned to by cold fluid inflow line after heat exchange and utilization
In；
Cryogen in the high temperature fluid and oil jacket inventionannulus flow channel of S14, thermoelectric generation module in oil pipe flow channel
Between temperature difference under the action of produce electricl energy, and by docking cable by defeated module outside electric energy inputing power；
S2, when the outlet of cold fluid injection pump by cold fluid inject pipeline be connected with oil jacket inventionannulus flow channel when, this method
Include the following steps：
S21, the cold fluid being stored in cold fluid storage container go out pipeline through cold fluid flow and enter the supercharging of cold fluid injection pump
Afterwards, pipeline is injected by cold fluid and enters oil pipe flow channel；
S22, cold fluid absorb during oil pipe flow channel flows downward from the hot fluid in oil jacket inventionannulus flow channel
Partial heat, temperature are kept low；
After S23, fluid reach shaft bottom, since shaft bottom is by grout off, from the fluid that oil pipe flow channel flows out from shaft bottom and oil
Gap between bottom of the tube enters in oil jacket inventionannulus flow channel, and flows up to ground along oil jacket inventionannulus flow channel,
Flow out fluid flow line into closed cycle, module utilized subsequently into closed cycle outflow hot fluid, by heat exchange and
It is returned in cold fluid storage container by cold fluid inflow line after utilization；
S24, fluid constantly carry out heat exchange, identical during oil jacket inventionannulus flow channel flows up with surrounding formation
Depth, the fluid temperature (F.T.) in oil jacket inventionannulus flow channel is higher than the fluid temperature (F.T.) in oil pipe flow channel, thermoelectric generation module
Under the action of temperature difference between the cryogen in high temperature fluid and oil pipe flow channel in oil jacket inventionannulus flow channel
It produces electricl energy, and by docking cable by defeated module outside electric energy inputing power.
7. thermoelectric power generation method according to claim 6, it is characterised in that：The cold fluid be water, liquid carbon dioxide,
Any one in liquid nitrogen.
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| CN201810525808.XA CN108775275B (en) | 2018-05-28 | 2018-05-28 | Single-well closed circulation underground thermoelectric power generation system and method |
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| CN201810525808.XA CN108775275B (en) | 2018-05-28 | 2018-05-28 | Single-well closed circulation underground thermoelectric power generation system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110021988A (en) * | 2019-04-28 | 2019-07-16 | 中国石油集团渤海钻探工程有限公司 | Thermal type thermoelectricity down-hole power |
| CN113374659A (en) * | 2021-06-18 | 2021-09-10 | 中国石油化工股份有限公司 | Hot dry rock power generation system based on carbon dioxide closed cycle |
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