CN114497663A - Deep well heat exchange type flow battery system based on geothermal energy - Google Patents
Deep well heat exchange type flow battery system based on geothermal energy Download PDFInfo
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- CN114497663A CN114497663A CN202111648558.7A CN202111648558A CN114497663A CN 114497663 A CN114497663 A CN 114497663A CN 202111648558 A CN202111648558 A CN 202111648558A CN 114497663 A CN114497663 A CN 114497663A
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- 238000010276 construction Methods 0.000 description 4
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
- H01M8/184—Regeneration by electrochemical means
- H01M8/188—Regeneration by electrochemical means by recharging of redox couples containing fluids; Redox flow type batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04276—Arrangements for managing the electrolyte stream, e.g. heat exchange
Abstract
The invention provides a deep well heat exchange type flow battery system based on geothermal energy. The heat exchange assembly is communicated with the battery and the pipeline and is used for containing electrolyte; the deep well is used for accommodating the heat exchange assembly. The flow battery system comprises a heat exchange assembly and a deep well to form a deep well heat exchanger, and the deep well heat exchanger is adopted to replace an electrolyte storage tank, has the function of heating the electrolyte and can replace a system heater; the heat exchange assembly is positioned underground, and does not occupy the area of the system; the utilization of geothermal energy is organically combined with the conventional system of the conventional flow battery, so that the complexity and the occupied area of the system are reduced, and the operation cost is reduced.
Description
Technical Field
The invention belongs to the technical field of electrochemical energy storage, and particularly relates to a deep well heat exchange type flow battery system based on geothermal energy.
Background
With the development of new energy and smart power grids and the encouragement of corresponding policies, high-capacity long-time energy storage technology enters a rapid development period. Among various energy storage technologies, the redox flow battery has remarkable characteristics, is more suitable for long-time, large-scale and large-capacity energy storage application occasions, receives increasing attention, and develops mature all-vanadium redox flow batteries, zinc-bromine redox flow batteries and iron-chromium redox flow batteries. However, the flow battery has low energy density, large system floor area, high temperature required for the operation of part of the flow battery system, and high system investment cost and operation cost.
Disclosure of Invention
Aiming at the problems, the invention provides a deep well heat exchange type flow battery system based on geothermal energy, which can effectively reduce the occupied area, the operation cost and the investment cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a deep well heat exchange type flow battery system based on geothermal energy comprises a battery, a heat exchange assembly and a deep well,
the heat exchange assembly is communicated with the pipeline of the battery and is used for containing electrolyte;
the deep well is used for accommodating the heat exchange assembly.
Preferably, the heat exchange assembly comprises an outer sleeve and an inner sleeve, the inner sleeve is arranged in the outer sleeve in a suspended mode, an outer ring cavity is arranged between the inner sleeve and the outer sleeve, an inner ring cavity is arranged inside the inner sleeve, and the outer ring cavity is communicated with the inner ring cavity.
Preferably, the heat exchange assembly comprises an anode heat exchange assembly and a cathode heat exchange assembly, the anode heat exchange assembly and the cathode heat exchange assembly are respectively located in two deep wells, the two deep wells are arranged in a separated manner, the anode heat exchange assembly is communicated with the pipeline of the battery to form an anode circulation closed circuit, the cathode heat exchange assembly is communicated with the pipeline of the battery to form a cathode circulation closed circuit, and the anode circulation closed circuit and the cathode circulation closed circuit are both provided with circulating pumps.
Preferably, an anti-corrosion layer is arranged on the inner wall of the inner sleeve.
Preferably, the outer wall of the outer sleeve is provided with an anti-corrosion sleeve, and the outer sleeve is fixed in the deep well through the anti-corrosion sleeve.
Preferably, the battery is provided with a positive electrode liquid inlet, a positive electrode liquid outlet, a negative electrode liquid inlet and a negative electrode liquid outlet, the positive electrode liquid inlet is communicated with the inner annular cavity pipeline of the positive electrode heat exchange assembly, and the positive electrode liquid outlet is communicated with the outer annular cavity pipeline of the positive electrode heat exchange assembly; the negative electrode liquid inlet is communicated with an inner annular cavity pipeline of the negative electrode heat exchange assembly, and the negative electrode liquid outlet is communicated with an outer annular cavity pipeline of the negative electrode heat exchange assembly.
Preferably, the heat exchanger further comprises a storage tank, and the positive heat exchange assembly and the negative heat exchange assembly are both communicated with the storage tank.
Preferably, the heat pump and the heat exchanger are sequentially arranged between the inner ring cavity and the battery along the direction from the inner ring cavity to the battery.
Preferably, the deep well is constructed by well construction or abandoned well modification.
The technical scheme of the invention has the following beneficial effects: the deep well heat exchange type flow battery system comprises a heat exchange assembly and a deep well to form a deep well heat exchanger, and the deep well heat exchanger is used for replacing an electrolyte storage tank, so that the deep well heat exchange type flow battery system has an anti-corrosion function; the deep well heat exchanger has the function of heating the electrolyte and can replace a system heater; the size of the deep well heat exchanger can be adjusted according to the temperature and the capacity required by the system; the construction of the deep well heat exchanger can adopt well digging or abandoned well reconstruction, and the system investment cost can be greatly reduced; the expansion of the deep well heat exchange type flow battery system can be realized by deepening the depth of a vertical well, constructing a horizontal well, constructing a well cluster or increasing the number of deep well heat exchangers; the deep well heat exchanger is located underground, and does not occupy the system area. The flow battery system organically combines geothermal energy utilization with the conventional flow battery system, reduces the complexity and the occupied area of the system, and reduces the operation cost.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 shows a first structural schematic diagram of a deep well heat exchange type flow battery system based on geothermal energy;
fig. 2 shows a structural schematic diagram two of the deep well heat exchange type flow battery system based on geothermal energy;
in the figure: 1. a battery; 2. a positive heat exchange assembly; 3. a negative heat exchange assembly; 4. a circulation pump; 5. an outer ring cavity; 6. an inner ring cavity.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A deep well heat exchange type flow battery system based on geothermal energy comprises a battery 1, a positive electrode heat exchange assembly 2, a negative electrode heat exchange assembly 3, a positive electrode circulation pipeline, a negative electrode circulation pipeline and two deep wells, wherein the two deep wells are arranged at intervals, the interval distance can be obtained by long-term heat collection numerical simulation according to deep well heat exchange, the positive electrode heat exchange assembly 2 and the negative electrode heat exchange assembly 3 are respectively positioned in the two deep wells, the positive electrode heat exchange assembly 2 is communicated with the battery pipeline to form a positive electrode circulation closed circuit, the negative electrode heat exchange assembly 3 is communicated with the battery pipeline to form a negative electrode circulation closed circuit, and circulating pumps 4 are arranged on the positive electrode circulation closed circuit and the negative electrode circulation closed circuit; the positive heat exchange assembly 2 and the negative heat exchange assembly 3 are both composed of an outer sleeve and an inner sleeve, a single-opening, double-opening or triple-opening drilling is adopted in a well forming mode, the outer sleeve is made of an anti-corrosion material sleeve (the outer sleeve can be a metal and anti-corrosion layer, and can also be a sleeve made of an anti-corrosion material, such as glass fiber reinforced plastics and high-temperature and high-pressure resistant plastics, in an exemplary embodiment, the outer sleeve is made of the anti-corrosion material sleeve), and a high-heat-conductivity material is adopted for well cementation, so that a rock stratum is completely attached to the outer sleeve; the inner sleeve is made of low-thermal-conductivity anti-corrosion material, can be in a single-layer, double-layer or double-layer internal vacuum form, is suspended in the outer sleeve by using tools such as a centralizer, a fixer and the like, and the bottom of the inner sleeve is not contacted with the well bottom; an outer ring cavity 5 is arranged between the inner sleeve and the outer sleeve, an inner ring cavity 6 is arranged inside the inner sleeve, and an anticorrosive layer is arranged on the inner wall of the inner sleeve.
Furthermore, the battery is provided with a positive electrode liquid inlet, a positive electrode liquid outlet, a negative electrode liquid inlet and a negative electrode liquid outlet, the positive electrode liquid inlet is communicated with an inner ring cavity 6 of the positive electrode heat exchange assembly 2 through a pipeline, and the positive electrode liquid outlet is communicated with an outer ring cavity 5 of the positive electrode heat exchange assembly 2 through a pipeline; the negative electrode liquid inlet is communicated with a pipeline 6 of an inner ring cavity of the negative electrode heat exchange assembly 3, and the negative electrode liquid outlet is communicated with a pipeline 5 of an outer ring cavity of the negative electrode heat exchange assembly. The deep well is constructed by well digging or abandoned well reconstruction, and the diameter and depth of the well constructed by the anode and cathode heat exchange assemblies can be adjusted according to the temperature and capacity required by the flow battery 1 system.
Further, the system also comprises a storage tank, and the storage tank is communicated with the anode heat exchange assembly 2 and the cathode heat exchange assembly 3. When the electrolyte capacity of the anode heat exchange assembly and the cathode heat exchange assembly cannot meet the requirement, the electrolyte can be supplied through the electrolyte stored in the storage tank; the capacity increase can be realized by increasing the number of the heat exchange assemblies under the condition of not influencing the long-term heat taking power.
The working principle of the deep well heat exchange type flow battery 1 system is as follows: when the system is in operation and the geothermal temperature meets the use requirement, the positive electrolyte is pumped out from the inner ring cavity 6 of the positive heat exchange assembly 2 through the circulating pump 4 and is pumped into the positive electrode of the battery 1 through the positive liquid inlet, the negative electrolyte is pumped out from the inner ring cavity 6 of the negative heat exchange assembly 3 and is pumped into the negative electrode of the battery 1 through the negative liquid inlet, after the temperature of the electrolyte is reduced through the battery 1, the positive electrolyte of the battery 1 flows into the outer ring cavity 5 of the positive heat exchange assembly 2 through the positive liquid outlet through a pipeline, and in the process of flowing from the outer ring cavity 5 to the deep part of the stratum, the heat of the surrounding stratum is absorbed and then flows into the inner ring cavity 6 of the positive heat exchange assembly 2 through the through hole, so that a positive closed cycle is formed; similarly, the negative electrolyte of the battery 1 flows into the outer ring cavity 5 of the negative heat exchange assembly 3 through the negative liquid outlet and the pipeline, and absorbs the heat of the surrounding stratum in the process of flowing to the deep part of the stratum from the outer ring cavity 5, and then flows to the inner ring cavity 6 of the negative heat exchange assembly 3 through the through hole to form a negative closed cycle.
The deep well heat exchange type flow battery system of the embodiment adopts a deep well heat exchanger consisting of a heat exchange assembly and a deep well to replace an electrolyte storage tank required by an original flow battery system, and the deep well heat exchanger has the function of heating the electrolyte and can replace a system heater; the size of the deep well heat exchanger can be adjusted according to the temperature and the capacity required by the system; the construction of the deep well heat exchanger can adopt well digging or abandoned well reconstruction, and the system investment cost can be greatly reduced; the expansion of the deep well heat exchange type flow battery system can be realized by deepening the depth of a vertical well, constructing a horizontal well, constructing a well cluster or increasing the number of deep well heat exchangers; the deep well heat exchanger is located underground, and does not occupy the system area. The flow battery system organically combines geothermal energy utilization with the conventional flow battery system, reduces the complexity and the occupied area of the system, and reduces the operation cost.
Example 2
A deep well heat exchange type flow battery system based on geothermal energy comprises a battery 1, a positive electrode heat exchange assembly 2, a negative electrode heat exchange assembly 3, a positive electrode circulation pipeline, a negative electrode circulation pipeline and two deep wells, wherein the two deep wells are arranged at intervals, the interval distance can be obtained through long-term heat collection numerical simulation according to deep well heat exchange, the positive electrode heat exchange assembly 2 and the negative electrode heat exchange assembly 3 are respectively positioned in the two deep wells, the positive electrode heat exchange assembly 2 is communicated with the battery pipeline to form a positive electrode circulation closed circuit, the negative electrode heat exchange assembly 3 is communicated with the battery pipeline to form a negative electrode circulation closed circuit, and the positive electrode circulation closed circuit and the negative electrode circulation closed circuit are both provided with a circulation pump 4; the positive heat exchange assembly 2 and the negative heat exchange assembly 3 are both composed of an outer sleeve and an inner sleeve, a single-opening, double-opening or triple-opening drilling is adopted in a well forming mode, the outer sleeve is made of an anti-corrosion material sleeve (the outer sleeve can be a metal and anti-corrosion layer, and can also be a sleeve made of an anti-corrosion material, such as glass fiber reinforced plastic and rigid plastic, in an exemplary embodiment, the outer sleeve is made of the anti-corrosion material sleeve), and a high-heat-conductivity material is adopted for well cementation, so that a rock stratum is completely attached to the outer sleeve; the inner sleeve is made of low-thermal-conductivity anti-corrosion material, can be in a single-layer, double-layer or double-layer internal vacuum form, is suspended in the outer sleeve by using tools such as a centralizer, a fixer and the like, and the bottom of the inner sleeve is not contacted with the well bottom; an outer ring cavity 5 is arranged between the inner sleeve and the outer sleeve, an inner ring cavity 6 is arranged inside the inner sleeve, and an anticorrosive layer is arranged on the inner wall of the inner sleeve.
Furthermore, the battery is provided with a positive electrode liquid inlet, a positive electrode liquid outlet, a negative electrode liquid inlet and a negative electrode liquid outlet, the positive electrode liquid inlet is communicated with an inner ring cavity 6 of the positive electrode heat exchange assembly 2 through a pipeline, and the positive electrode liquid outlet is communicated with an outer ring cavity 5 of the positive electrode heat exchange assembly 2 through a pipeline; the negative electrode liquid inlet is communicated with a pipeline 6 of an inner ring cavity of the negative electrode heat exchange assembly 3, and the negative electrode liquid outlet is communicated with a pipeline 5 of an outer ring cavity of the negative electrode heat exchange assembly. The deep well is constructed by well digging or abandoned well transformation, and the diameter and the depth of the well constructed by the anode and cathode heat exchange assemblies can be adjusted according to the temperature and the capacity required by the flow battery 1 system.
Further, as shown in fig. 2, the system further includes a heat pump and a heat exchanger, and the heat pump and the heat exchanger are sequentially disposed between the inner ring cavity and the battery along a direction from the inner ring cavity to the battery. Specifically, the heat exchanger is arranged on a circulating pipeline from the anode (or cathode) liquid inlet to the anode (or cathode) liquid outlet, the electrolyte enters the anode (or cathode) storage tank from the anode (or cathode) liquid outlet, and is driven by the circulating pump 4 to circularly flow through the heat exchanger and enter the anode (or cathode) liquid inlet. The heat pump is arranged on a pipeline from the inner ring cavity 6 to the outer ring cavity 5, water in the inner ring cavity 6 is provided with circulating power by the liquid pump, the water is fed into the outer ring cavity 5 of the heat exchange assembly, flows to the deep part of the stratum from the outer ring cavity 5, absorbs the heat of the surrounding stratum, is heated by geothermal heat and then is pumped out by the inner ring cavity 6 of the heat exchange assembly, and then flows through the heat exchanger to exchange heat with electrolyte in the circulating pipeline from the anode (or cathode) liquid inlet to the anode (or cathode) liquid outlet, so as to heat the electrolyte. Therefore, aiming at the region with slightly poor geothermal resources, the deep well heat exchanger of the system is only used as an extraction tool of underground heat, and is combined with a ground source heat pump to heat the flow battery system.
In summary, the deep well heat exchange type flow battery system of the invention adopts the deep well heat exchanger composed of the heat exchange assembly and the deep well, and the deep well heat exchanger can replace the electrolyte storage tank required by the original flow battery system in the area with better geothermal resources; aiming at the area with slightly poor geothermal resources, the deep well heat exchanger is used as an extraction tool of underground heat and is combined with a ground source heat pump to heat a flow battery system; the deep well heat exchanger has the function of heating the electrolyte and can replace a system heater; the size of the deep well heat exchanger can be adjusted according to the temperature and the capacity required by the system; the construction of the deep well heat exchanger can adopt well digging or abandoned well reconstruction, and the system investment cost can be greatly reduced; the expansion of the deep well heat exchange type flow battery system can be realized by deepening the depth of a vertical well, constructing a horizontal well, constructing a well cluster or increasing the number of deep well heat exchangers; the deep well heat exchanger is located underground, and does not occupy the system area. The flow battery system organically combines the utilization of geothermal energy with the conventional system of the existing flow battery, reduces the complexity and the occupied area of the system, and reduces the operation cost. Therefore, the flow battery system combines geothermal energy utilization with the conventional flow battery system, greatly reduces the complexity and the occupied area of the system, and reduces the operation cost.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A deep well heat exchange type flow battery system based on geothermal energy is characterized by comprising a battery, a heat exchange assembly and a deep well,
the heat exchange assembly is communicated with the pipeline of the battery and is used for containing electrolyte;
the deep well is used for accommodating the heat exchange assembly.
2. The deep well heat exchange type flow battery system based on geothermal energy of claim 1, wherein the heat exchange assembly comprises an outer sleeve and an inner sleeve, the inner sleeve is suspended in the outer sleeve, an outer annular cavity is arranged between the inner sleeve and the outer sleeve, an inner annular cavity is arranged inside the inner sleeve, and the outer annular cavity is communicated with the inner annular cavity.
3. The deep well heat exchange type flow battery system based on geothermal energy is characterized in that the heat exchange assembly comprises a positive heat exchange assembly and a negative heat exchange assembly, the positive heat exchange assembly and the negative heat exchange assembly are respectively positioned in two deep wells, the two deep wells are arranged in a separated mode, the positive heat exchange assembly is communicated with a pipeline of the battery to form a positive circulation closed circuit, the negative heat exchange assembly is communicated with the pipeline of the battery to form a negative circulation closed circuit, and circulating pumps are arranged on the positive circulation closed circuit and the negative circulation closed circuit.
4. The deep well heat exchange type flow battery system based on geothermal energy of claim 2, wherein the inner sleeve is provided with an anti-corrosion layer on the inner wall.
5. The geothermal energy-based deep well heat-exchange flow battery system according to claim 2, wherein the outer sleeve is provided with an anti-corrosion sleeve on its outer wall, and the outer sleeve is fixed in the deep well through the anti-corrosion sleeve.
6. The deep well heat exchange type flow battery system based on geothermal energy of claim 3, wherein the battery is provided with a positive liquid inlet, a positive liquid outlet, a negative liquid inlet and a negative liquid outlet, the positive liquid inlet is communicated with the inner annular pipeline of the positive heat exchange assembly, and the positive liquid outlet is communicated with the outer annular pipeline of the positive heat exchange assembly; the negative electrode liquid inlet is communicated with an inner annular cavity pipeline of the negative electrode heat exchange assembly, and the negative electrode liquid outlet is communicated with an outer annular cavity pipeline of the negative electrode heat exchange assembly.
7. The deep well heat exchange type flow battery system based on geothermal energy of claim 6, further comprising a storage tank, wherein the positive heat exchange assembly and the negative heat exchange assembly are both in communication with the storage tank.
8. The deep well heat exchange type flow battery system based on geothermal energy according to any one of claims 2 to 6, further comprising a heat pump and a heat exchanger, wherein the heat pump and the heat exchanger are sequentially arranged between the inner ring cavity and the battery along the direction from the inner ring cavity to the battery.
9. The geothermal energy-based deep well heat-exchange flow battery system of claim 8, wherein the deep well is constructed by well drilling or is modified by abandoned wells.
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| CN202111648558.7A CN114497663A (en) | 2021-12-30 | 2021-12-30 | Deep well heat exchange type flow battery system based on geothermal energy |
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| CN202111648558.7A CN114497663A (en) | 2021-12-30 | 2021-12-30 | Deep well heat exchange type flow battery system based on geothermal energy |
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Cited By (1)
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