CN117212864A - Ground heat combined solar heat storage and supply heating system for artificial reservoir in limestone region - Google Patents
Ground heat combined solar heat storage and supply heating system for artificial reservoir in limestone region Download PDFInfo
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- CN117212864A CN117212864A CN202210625962.0A CN202210625962A CN117212864A CN 117212864 A CN117212864 A CN 117212864A CN 202210625962 A CN202210625962 A CN 202210625962A CN 117212864 A CN117212864 A CN 117212864A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 116
- 235000019738 Limestone Nutrition 0.000 title claims description 26
- 239000006028 limestone Substances 0.000 title claims description 26
- 238000005338 heat storage Methods 0.000 title claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000003860 storage Methods 0.000 claims abstract description 22
- 239000004568 cement Substances 0.000 claims description 32
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 238000001704 evaporation Methods 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 238000004146 energy storage Methods 0.000 description 5
- 238000004321 preservation Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Abstract
The application discloses a geothermal combined solar heat access heating system, which relates to the field of renewable energy sources, energy conservation and environmental protection, and comprises the following components: the solar energy and heating system comprises an artificial reservoir system and a solar energy and heating system, wherein the artificial reservoir system comprises an artificial reservoir, a compact cover layer, a first geothermal well and a second geothermal well, the compact cover layer covers the artificial reservoir, and the first geothermal well and the second geothermal well are communicated with the artificial reservoir through the compact cover layer; the solar energy and heating system comprises a solar heat collector, a hot water storage tank, a heat pump unit and a heating building, wherein the solar heat collector, the hot water storage tank, a first geothermal well and a second geothermal well form a loop to store heat in a first time period; in the second period, the solar collector, the hot water storage tank and the heating building form a loop to provide user heat, and the heating building, the heat pump unit, the second geothermal well and the first geothermal well form a loop to heat the circulating water. The system solves the problem of large fluctuation of solar energy independent heating in winter.
Description
Technical Field
The application relates to the field of renewable energy sources, energy conservation and environmental protection, in particular to a limestone region artificial reservoir geothermal heat combination solar energy access heat heating system.
Background
The haze in northern areas of China is serious, and the haze is further aggravated by non-clean energy heating in winter, so that the technical requirement for clean energy heating in the present stage is urgent. Geothermal and solar energy are becoming more and more important in northern heating as clean renewable energy sources. Geothermal heating has evolved rapidly in recent years, but serious imbalance in resource distribution has limited further expansion of its overall scale. Solar energy alone heating is also subject to a number of limitations due to wave problems, and seasonal underground heat storage is one of the effective measures to solve the wave problems. In areas with rich geothermal energy, geothermal heating is adopted. In areas with insufficient geothermal energy, if solar energy can be stored underground and Xia Chu is used in winter, not only can the solar energy be stored in a cross-season mode, but also the problem of large fluctuation of the solar energy can be solved, and stable output is realized.
The underground storage of solar energy mainly comprises two modes, namely shallow water-bearing layer energy storage and middle-deep water-bearing layer energy storage. The shallow aquifer energy storage is less applied in China due to the risk of polluting underground drinking water. The common problem faced by the energy storage of the middle-deep aquifer is low heat recovery efficiency.
Disclosure of Invention
Aiming at the defects in the prior art, the application provides a ground heat combined solar heat access heating system for an artificial reservoir in a limestone area, which is arranged in the limestone area, stores solar energy underground in a non-heating season through the artificial reservoir system and a solar energy and heating system, takes out the solar energy for heating in a heating season, and solves the problem of large independent heating fluctuation of the solar energy in winter.
In order to achieve the above purpose, the present application may be performed by the following technical scheme:
a geothermal combined solar energy access thermal heating system disposed in a limestone region, comprising:
an artificial reservoir system comprising an artificial reservoir, a tight cap, a first geothermal well, and a second geothermal well, the tight cap overlaying the artificial reservoir, the first geothermal well and the second geothermal well in communication with the artificial reservoir through the tight cap;
the solar energy and heating system comprises a solar heat collector, a heat storage water tank, a heat pump unit and a heating building, wherein,
during a first period of time, the solar collector, the hot water storage tank, the first geothermal well, and the second geothermal well form a loop to store heat; in a second period of time, the solar collector, the hot water storage tank and the heating building form a loop to provide user heat, and the heating building, the heat pump unit, the second geothermal well and the first geothermal well form a loop to heat circulating water.
The geothermal combined solar energy access heat heating system is characterized in that the peripheries of the first geothermal well and the second geothermal well are provided with heat preservation cement and high-conductivity cement, wherein the heat preservation cement is arranged above the high-conductivity cement, the artificial reservoir is connected below the high-conductivity cement, and the vertical heights of the heat preservation cement and the high-conductivity cement are equal to the thickness of the compact covering layer.
The geothermal heat combined solar heat access heating system is further characterized in that the condensing end of the heat pump unit is communicated with the heating building, the evaporation end inlet of the heat pump unit is connected with the first geothermal well through the second valve, and the evaporation end outlet of the heat pump unit is connected with the second geothermal well through the first hot water pump and the first valve in sequence.
The geothermal combined solar heat storage and retrieval heating system is characterized in that the inlet end of the solar heat collector is provided with two branches, the branch with the third valve is connected to the second geothermal well, and the branch with the fourth valve is connected to the heating building; the outlet end of the solar heat collector is sequentially connected with the hot water storage tank and the second hot water pump, two branches are arranged at the outlet end of the second hot water pump, the branch with the sixth valve is connected to the heating building, and the branch with the fifth valve is connected to the downstream of the first valve.
The geothermal combined solar energy access thermal heating system as described above, further, the fracture and crack size of the limestone region needs to be maintained within a set range.
The geothermal combined solar energy access thermal heating system as described above, further, the depth of the artificial reservoir from the ground needs to be maintained within a set range.
The geothermal combined solar energy access heat heating system is further characterized in that when the first time period is non-heating Ji Chure, the second time period is heating in heating season.
The geothermal combined solar access heat heating system as described above, further, in the non-heating Ji Chure, the first geothermal well is used as an injection well and the second geothermal well is used as a production well; and when the heating season is taking heat, the second geothermal well is used as an injection well, and the first geothermal well is used as a production well.
The geothermal heat combined solar energy access heat heating system further comprises the non-heating season heat storage and the heating season heat extraction alternately, so that fluctuation characteristics of solar energy are solved by utilizing load-changing adjustment capability.
Compared with the prior art, the application has the beneficial effects that: the geothermal heat combined solar heat storage and supply heating system is arranged in a limestone area, solar energy is stored underground in a non-heating season through an artificial reservoir system and a solar energy and heating system, and the solar energy is taken out for heating in a heating season, so that the problem of large fluctuation of solar energy independent heating in winter is solved. Meanwhile, because the thermal conductivity of the limestone is high, the thermal efficiency of the limestone artificial reservoir is high, and the thermal access can be realized, the system has the advantage of high heat recovery efficiency, and the shallow compact limestone stratum is easy to fracture, so that the artificial thermal storage risk is small, and the cost is low.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly explain the drawings needed in the embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a geothermal heat combined solar heat and access heating system according to an embodiment of the present application;
fig. 2 is a schematic diagram of the structure of an artificial reservoir system in a limestone region according to an embodiment of the application.
Wherein: 1. an artificial reservoir; 2. a dense cap layer; 3. a first geothermal well; 4. a second geothermal well; 5. high-conductivity cement; 6. thermal insulation cement; 7. a solar collector; 8. a hot water storage tank; 9. a heat pump unit; 10. heating a building; 11. a first hot water pump; 12. a second hot water pump; 13. a first valve; 14. a second valve; 15. a third valve; 16. a fourth valve; 17. a fifth valve; 18. and a sixth valve.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Examples:
it should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise 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 or inherent to such process, method, article, or apparatus.
It is to be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," and the like are directional or positional relationships as indicated based on the drawings, merely to facilitate describing the application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.
In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. Furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
Referring to fig. 1 to 2, the application provides a geothermal combined solar energy access heat heating system which is arranged in a limestone area, stores solar energy underground in a non-heating season through an artificial reservoir system and a solar energy and heating system, takes out the solar energy for heating in a heating season, and solves the problem of large fluctuation of solar energy independent heating in winter. Meanwhile, the thermal conductivity of the limestone is high, the thermal efficiency of the limestone artificial reservoir 1 is high, and heat can be stored and taken out, so that the system has the advantage of high heat recovery efficiency, and the shallow compact limestone stratum is easy to fracture, so that the artificial thermal storage risk is small, and the cost is low.
Referring to fig. 1, fig. 1 illustrates a limestone zone artificial reservoir geothermal heat integration solar energy access thermal heating system comprising: an artificial reservoir system and a solar and heating system; the artificial reservoir system comprises an artificial reservoir 1, a tight cap 2, a first geothermal well 3 and a second geothermal well 4, wherein the tight cap 2 is covered on the artificial reservoir 1, and the first geothermal well 3 and the second geothermal well 4 are communicated with the artificial reservoir 1 through the tight cap 2; the solar energy and heating system comprises a solar heat collector 7, a hot water storage tank 8, a heat pump unit 9 and a heating building 10, wherein the solar heat collector 7, the hot water storage tank 8, the first geothermal well 3 and the second geothermal well 4 form a loop to store heat in a first period of time; in the second period, the solar collector 7, the hot water storage tank 8 and the heating building 10 form a circuit to supply the user's heat, and the heating building 10, the heat pump unit 9, the second geothermal well 4 and the first geothermal well 3 form a circuit to heat the circulating water.
In this embodiment, the artificial reservoir system is placed under the ground, the solar energy and heating system is placed on the ground, and solar energy is stored under the ground by looping the solar collector 7, the hot water storage tank 8, the first geothermal well 3 and the second geothermal well 4 during a first period of time. In a second time period, solar energy and an artificial reservoir system are utilized for combined heating, and the problem of large fluctuation of solar energy single heating is solved, wherein the artificial reservoir 1 is built in an limestone stratum area without large fracture or large crack, and a dense cover layer 2 is covered above the artificial reservoir 1, so that water leakage in the artificial reservoir 1 can be prevented. Meanwhile, the thermal conductivity of the limestone is high, so that the thermal efficiency of the limestone artificial reservoir 1 is high, and the heat can be stored and taken, so that the system has the advantage of high heat recovery efficiency. In addition, the system has no requirement on the ground temperature gradient and the presence or absence of ground water, so that the construction site can be more easily selected.
Referring to fig. 2, as an alternative embodiment, in some examples, the outer circumferences of the first geothermal well 3 and the second geothermal well 4 are provided with insulating cement 6 and high-conductivity cement 5, wherein the insulating cement 6 is disposed above the high-conductivity cement 5, the artificial reservoir 1 is connected below the high-conductivity cement 5, and the vertical heights of the insulating cement 6 and the high-conductivity cement 5 are equivalent to the thickness of the dense cover layer 2.
Specifically, the first geothermal well 3 and the second geothermal well 4 are both well-fixed by adopting heat-insulating cement 6 and high-conductivity cement 5, the artificial reservoir 1 is connected below the high-conductivity cement 5, the high-conductivity cement 5 can play a role in rock energy storage, the heat-insulating cement 6 is arranged above the high-conductivity cement 5, and the heat-insulating cement 6 can play a role in preventing heat loss of the first geothermal well 3 and the second geothermal well 4.
As an alternative embodiment, in some embodiments, the condensing end of the heat pump unit 9 is communicated with the heating building 10, the inlet of the evaporating end of the heat pump unit 9 is connected to the first geothermal well 3 through the second valve 14, and the outlet of the evaporating end of the heat pump unit 9 is connected to the second geothermal well 4 through the first hot water pump 11 and the first valve 13 in sequence.
As an alternative embodiment, in some examples, the inlet end of the solar collector 7 is provided with two branches, the branch with the third valve 15 being connected to the second geothermal well 4 and the branch with the fourth valve 16 being connected to the heating building 10; the outlet end of the solar heat collector 7 is sequentially connected with the hot water storage tank 8 and the second hot water pump 12, the outlet end of the second hot water pump 12 is provided with two branches, the branch with the sixth valve 18 is connected to the heating building 10, and the branch with the fifth valve 17 is connected to the downstream of the first valve 13.
As an alternative, in some embodiments, the fracture and fracture size of the limestone region needs to be kept within a set range. In this embodiment, the artificial reservoir 1 is built in a limestone stratum area without large fracture or large crack, and the compact cover layer 2 is covered above the artificial reservoir 1, so that water in the artificial reservoir 1 can be prevented from leaking out.
As an alternative, in some embodiments the depth of the artificial reservoir 1 from the surface needs to be kept within a set range. In this embodiment, since the shallow tight limestone formation is easily fractured, the artificial reservoir 1 should be as shallow as possible during construction of the system, so as to reduce the engineering cost of creating the reservoir.
As an alternative implementation, in some embodiments, the first time period is when not heating Ji Chure and the second time period is when heating is being performed in a heating season.
In the above embodiment, further, in the case of non-heating Ji Chure, the first geothermal well 3 is used as an injection well, and the second geothermal well 4 is used as a production well; during heating season heat extraction, the second geothermal well 4 is used as an injection well, and the first geothermal well 3 is used as a production well. In this embodiment, in different time periods, the injection and extraction of the system flow in opposite directions, so that the heat extraction efficiency of the system is higher.
In the above embodiment, further, heat storage in a non-heating season is alternated with heat extraction in a heating season, so as to solve the fluctuation characteristic of solar energy by utilizing the variable load adjustment capability. Illustratively, the system stores heat by using the artificial reservoir system in a non-heating season, and the system heats by combining solar energy with the artificial reservoir system in a heating season, so that the fluctuation characteristic of the solar energy is solved through the variable load adjustment capability of the artificial reservoir system.
For a better understanding of the present application, the operation of the local heat integration solar access heating system is described below.
Taking the region with the limestone burial depth of 500-1500m as an example, the ground temperature gradient is 30 ℃/km, and 500m is shallow as a compact mud-sand interbedded. The artificial reservoir 1 is from 950m to 1000m, and the first geothermal well 3 and the second geothermal well 4 are spaced 500m apart. The well section with the depth of 500m adopts heat preservation cement 6 well cementation, and the well section with the depth of 500m adopts high-conductivity cement 5 well cementation. The solar heat collector 7 adopts a vacuum tube heat collector, and the heat collection temperature is adjustable between 30 ℃ and 100 ℃.
The working process of the system for heat storage in non-heating seasons is as follows:
the third valve 15 and the fifth valve 17 are opened and the other valves are closed. When the water temperature of the solar heat collector 7 reaches the requirement, for example, 90 ℃, hot water enters the hot water storage tank 8. The second hot water pump 12 pumps hot water in the hot water storage tank 8, and the hot water enters the first geothermal well 3 after flowing through the fifth valve 17 and then enters the artificial reservoir 1 for heat storage. The circulating water returned from the artificial reservoir 1 returns to the surface through the second geothermal well 4 and then flows to the inlet of the solar collector 7 through the third valve 15 to be reheated.
The working process of the system for taking heat and heating in heating seasons is as follows:
the third valve 15 and the fifth valve 17 are closed and the other valves are opened. At this point, the solar collector 7 and the artificial reservoir system are heated in parallel. Taking the heating building 10 as an example of floor radiant heating, the temperature of the supplied water is 40/30 ℃.
The working process of the solar heat collector heating system is as follows: the backwater of the heating building 10 flows through the fourth valve 16 and then enters the inlet of the solar heat collector 7, and after being heated by the solar heat collector 7, the backwater becomes hot water with the temperature of 40 ℃ and enters the hot water storage tank 8. The second hot water pump 12 pumps hot water at 40 ℃ in the hot water storage tank 8, and the hot water flows through the sixth valve 18 to heat the heating building 10.
The artificial reservoir system heats the following working processes: the return water of 30 ℃ of the heating building 10 is changed into hot water of 40 ℃ after being heated by the condenser of the heat pump unit 9, and then the hot water is sent to the heating building 10 for heating. Circulating water at the temperature of 8 ℃ at the outlet of the evaporator of the heat pump unit 9 flows through the first hot water pump 11 and the first valve 13, then enters the second geothermal well 4, is heated through the artificial reservoir 1, returns to the ground surface through the first geothermal well 3, becomes 18 ℃, and then enters the evaporator of the heat pump unit 9 through the second valve 14.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The above embodiments are only for illustrating the technical concept and features of the present application, and are intended to enable those skilled in the art to understand the content of the present application and implement the same, and are not intended to limit the scope of the present application. All equivalent changes or modifications made in accordance with the essence of the present application are intended to be included within the scope of the present application.
Claims (9)
1. A geothermal combined solar energy access heating system disposed in a limestone region, comprising:
an artificial reservoir system comprising an artificial reservoir, a tight cap, a first geothermal well, and a second geothermal well, the tight cap overlaying the artificial reservoir, the first geothermal well and the second geothermal well in communication with the artificial reservoir through the tight cap;
the solar energy and heating system comprises a solar heat collector, a heat storage water tank, a heat pump unit and a heating building, wherein,
during a first period of time, the solar collector, the hot water storage tank, the first geothermal well, and the second geothermal well form a loop to store heat; in a second period of time, the solar collector, the hot water storage tank and the heating building form a loop to provide user heat, and the heating building, the heat pump unit, the second geothermal well and the first geothermal well form a loop to heat circulating water.
2. The geothermal combined solar energy access thermal heating system of claim 1, wherein the outer perimeter of the first geothermal well and the second geothermal well is provided with a thermal cement and a high conductivity cement, wherein the thermal cement is disposed above the high conductivity cement, the artificial reservoir is connected below the high conductivity cement, and the vertical heights of the thermal cement and the high conductivity cement are comparable to the thickness of the dense blanket.
3. The geothermal combined solar energy access heat heating system of claim 1, wherein the condensing end of the heat pump unit is communicated with the heating building, the evaporating end inlet of the heat pump unit is connected with the first geothermal well through a second valve, and the evaporating end outlet of the heat pump unit is connected with the second geothermal well through a first hot water pump and a first valve in sequence.
4. A geothermal combined solar energy access heating system according to claim 3 wherein the inlet end of the solar collector is provided with two branches, a branch with a third valve is connected to the second geothermal well and a branch with a fourth valve is connected to the heating building; the outlet end of the solar heat collector is sequentially connected with the hot water storage tank and the second hot water pump, two branches are arranged at the outlet end of the second hot water pump, the branch with the sixth valve is connected to the heating building, and the branch with the fifth valve is connected to the downstream of the first valve.
5. A geothermal combined solar energy access heating system according to claim 1 wherein the fracture and crack size of the limestone region is required to be maintained within a set range.
6. A geothermal combined solar energy access heating system according to claim 1 wherein the depth of the artificial reservoir from the ground is required to be maintained within a set range.
7. The geothermal combined solar energy access thermal heating system of claim 1, wherein the first period of time is when not heating Ji Chure and the second period of time is when heating is being obtained in a heating season.
8. The geothermal combined solar energy access thermal heating system of claim 7, wherein the first geothermal well acts as an injection well and the second geothermal well acts as a production well when not heating Ji Chure; and when the heating season is taking heat, the second geothermal well is used as an injection well, and the first geothermal well is used as a production well.
9. The geothermal combined solar energy access heating system of claim 8, wherein the non-heating season heat storage alternates with the heating season heat extraction to account for fluctuating characteristics of solar energy with variable load regulation capability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210625962.0A CN117212864A (en) | 2022-06-02 | 2022-06-02 | Ground heat combined solar heat storage and supply heating system for artificial reservoir in limestone region |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210625962.0A CN117212864A (en) | 2022-06-02 | 2022-06-02 | Ground heat combined solar heat storage and supply heating system for artificial reservoir in limestone region |
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