CN114017236A - Energy storage type cofferdam pond and energy storage method - Google Patents
Energy storage type cofferdam pond and energy storage method Download PDFInfo
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- CN114017236A CN114017236A CN202111237825.1A CN202111237825A CN114017236A CN 114017236 A CN114017236 A CN 114017236A CN 202111237825 A CN202111237825 A CN 202111237825A CN 114017236 A CN114017236 A CN 114017236A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 104
- 239000012528 membrane Substances 0.000 claims abstract description 95
- 239000013505 freshwater Substances 0.000 claims abstract description 88
- 239000012267 brine Substances 0.000 claims abstract description 52
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 52
- 238000002955 isolation Methods 0.000 claims abstract description 28
- 150000003839 salts Chemical class 0.000 claims abstract description 27
- 230000003204 osmotic effect Effects 0.000 claims abstract description 12
- 230000005611 electricity Effects 0.000 claims abstract description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 16
- 239000011780 sodium chloride Substances 0.000 claims description 16
- 238000010248 power generation Methods 0.000 claims description 15
- 238000001223 reverse osmosis Methods 0.000 claims description 9
- 239000012466 permeate Substances 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 238000005086 pumping Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 5
- 239000000243 solution Substances 0.000 abstract description 4
- 239000012266 salt solution Substances 0.000 abstract description 2
- 230000006378 damage Effects 0.000 description 4
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000005068 transpiration Effects 0.000 description 1
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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
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
-
- 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
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/12—Blades; Blade-carrying rotors
-
- 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
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
The invention relates to the technical field of osmotic pressure energy storage, and discloses an energy storage type cofferdam pond and an energy storage method, wherein the energy storage type cofferdam pond comprises the following steps: the cofferdam is divided into a fresh water area and a brine area by the isolation dam, and the bottom of the isolation dam is provided with a circulation channel for communicating the fresh water area and the brine area; the semi-permeable membrane wall is arranged in the circulation channel and close to one side of the fresh water area, and an isolation door is arranged on one side of the semi-permeable membrane wall close to the fresh water area in a sliding mode along the vertical direction; the water turbine is arranged in the flow passage and used for receiving energy to pressurize the flow passage or generate electricity by utilizing water flow of the fresh water area flowing to the brine area. The invention has the following advantages and effects: in addition, according to the energy storage method provided by the application, because the pressure difference between two sides of the semipermeable membrane is in direct proportion to the concentration of the salt solution, the pressure difference of up to 20MPa can be established by adjusting the salt content of the solution on two sides, which is equivalent to a dam pressure head of 2000 meters, compared with a water pumping energy storage power station, the energy storage density of the cofferdam pond is much higher, and the cost is reduced by nearly two thirds.
Description
Technical Field
The application relates to the technical field of osmotic pressure energy storage, in particular to an energy storage type cofferdam pond and an energy storage method.
Background
At present, under the drive of a double-carbon target, the proportion of renewable energy sources in the energy structure of China will be larger and larger. The intermittency is the common characteristic of renewable energy sources, is greatly influenced by seasons and environmental factors, and brings challenges to the stable control and safe operation of the existing power grid. The energy storage has the functions of eliminating power peak-valley difference, realizing smooth output of renewable energy sources, adjusting peak, adjusting frequency, realizing reserve capacity and the like, and meets the requirements of stable power generation and safe access of the renewable energy sources to a power grid. At present, the world accounts for the highest water pumping energy storage, the total installed capacity of the water pumping energy storage reaches 127GW, and the water pumping energy storage accounts for 99% of the total energy storage capacity. The water pumping energy storage is realized by two mutually connected reservoirs which are positioned at different heights: at low electricity, the water stored in the upper reservoir, during its passage to the lower reservoir, pushes the turbine in rotation, thereby converting the potential energy into mechanical energy and producing electrical energy with the aid of the generator; in the charging process, the electric motor converts electric energy into mechanical energy, and water is conveyed from the lower reservoir to the upper reservoir through the pipeline, so that the electric energy is converted into potential energy.
However, the application of the water pumping and energy storage technology is extremely dependent on the terrain and is very difficult to select the site, because the upper reservoir and the lower reservoir are required to exist in a short distance and have a high height difference; and under the condition of limited height difference, the energy density which can be achieved by pumping water and storing energy is also extremely limited. In addition, the biggest limitation to the development of the technology is the extremely low economical efficiency, the investment cost of the water pumping and energy storage power station is very high, and some water pumping and energy storage power stations can not be profitable at all.
Disclosure of Invention
Aiming at the defects in the prior art, the application aims to provide an energy storage type cofferdam pond and an energy storage method, so that osmotic pressure is utilized to replace height difference, osmotic pressure energy storage is realized, the site selection space of an energy storage power station can be effectively widened, and the energy storage cost is reduced.
In order to achieve the above purposes, on one hand, the technical scheme is as follows:
the application provides an energy storage formula cofferdam pond includes:
the cofferdam is divided into a fresh water area and a brine area by the isolation dam, and the bottom of the isolation dam is provided with a circulation channel for communicating the fresh water area and the brine area;
the semi-permeable membrane wall is arranged in the circulation channel and close to one side of the fresh water area, an isolation door is arranged on one side of the semi-permeable membrane wall close to the fresh water area in a sliding mode along the vertical direction, and when the isolation door completely falls down, the isolation door completely seals the circulation channel;
the hydraulic turbine sets up in the circulation passageway, and the quantity has one or more, the hydraulic turbine is used for accepting the energy and pressurizes or utilize the rivers of fresh water district flow direction brine district to generate electricity in to the circulation passageway.
Preferably:
the semi-permeable membrane wall is formed by splicing a plurality of semi-permeable membrane plates;
the semi-permeable membrane plate comprises:
the surface of the first inner membrane is uniformly provided with through holes with the average aperture of 1 nm;
and the plate shell is coated outside the first inner membrane, and holes with the average pore diameter of 0.5-2mm are uniformly distributed on two end faces of the plate shell.
Preferably:
the number of the semi-permeable membrane walls is multiple;
the semi-permeable membrane plates on the adjacent semi-permeable membrane walls are arranged in a staggered manner;
the adjacent semipermeable membrane walls are connected through a bracket.
4. The energy storage cofferdam pond of claim 1, wherein:
the semi-permeable membrane wall is formed by splicing a plurality of semi-permeable membrane drums;
the semi-permeable membrane cylinder comprises:
the two end surfaces of the barrel shell face the fresh water area and the brine area respectively, and holes with the average aperture of 0.5-2mm are uniformly distributed on the end surfaces of the barrel shell;
and through holes with the average aperture of 1nm are uniformly distributed on the surface of the second inner membrane, and the barrel-type inner membrane is arranged in the barrel shell along the radial section.
Preferably:
the semi-permeable membrane wall further comprises:
a fresh water wall proximate to the fresh water zone;
the saline wall is close to the saline area, and a pressure groove is formed in the position, close to the isolation dam, of the saline wall;
one end of part of the semi-permeable membrane barrel extends out of the pressure tank, and the other end of the semi-permeable membrane barrel is connected to the fresh water wall through a bracket;
one end part of the other semi-permeable membrane barrels extends out of the fresh water wall, and the other end of the semi-permeable membrane barrels is connected to the saline wall through a bracket.
Preferably:
the height of the isolation dam is at least 5m higher than the highest water level of the fresh water area and the salt water area.
Preferably:
a fresh water valve is arranged on one side of the cofferdam close to the fresh water area, and the distance between the fresh water valve and the bottom of the cofferdam is a first preset height;
and a brine valve is arranged on one side of the cofferdam close to the brine area, and the distance between the brine valve and the bottom of the cofferdam is a second preset height.
Preferably:
and a windmill array is arranged at the top of the isolation dam and is connected with the water turbine.
The application also provides an energy storage method based on the energy storage type cofferdam pond, which comprises the following steps:
when the energy storage type cofferdam pond is in an initial state, the isolating door falls down to seal the flow passage, and simultaneously, saline water is filled into the saline water area, and fresh water is filled into the fresh water area;
when the energy storage type cofferdam pond is in a power generation state, the isolating door is completely lifted, water in the fresh water area permeates into the salt water area, a high-pressure cavity is formed in the circulation channel, and the pressure difference between the high-pressure cavity and the salt water area drives the water turbine to generate power;
when the energy storage type cofferdam pond is in an energy storage state, the isolating door is completely lifted, the water turbine receives energy supply and presses salt water into the circulation channel to form a high-pressure area, and water in the salt water enters the fresh water area through the semipermeable membrane by reverse osmosis under the pressure difference between the high-pressure area and the fresh water area;
when the energy storage type cofferdam pond is in an energy storage state and the osmotic pressure between the fresh water area and the salt water area reaches the preset osmotic pressure, the isolating door falls down to seal the circulation channel, and the water turbine stops rotating.
Preferably:
the top of the isolation dam is provided with a windmill array, and the windmill array is connected with a water turbine;
also comprises the following steps:
when the power generation power of the windmill array reaches a first preset threshold value, the energy storage type cofferdam pond enters an energy storage state, and the windmill array supplies power to the water turbine;
when the power generation power of the windmill array is lower than a first preset threshold value, the energy storage type cofferdam pond enters a power generation state, the pressure difference between the high-pressure cavity and the brine area drives the water turbine to do work, and the water turbine drives the windmill array to rotate to generate power.
The beneficial effect that technical scheme that this application provided brought includes:
the energy storage type cofferdam pond breaks through the geographical condition limitation of water pumping energy storage, forms water level difference by arranging the cofferdam and the isolation dam, and realizes free flow of water by utilizing the characteristic that water is allowed to permeate through by the semipermeable membrane and salts cannot permeate through.
In addition, according to the energy storage method provided by the application, because the pressure difference between two sides of the semipermeable membrane is in direct proportion to the concentration of the salt solution, the pressure difference of up to 20MPa can be established by adjusting the salt content of the solution on two sides, which is equivalent to a dam pressure head of 2000 meters, compared with a water pumping energy storage power station, the energy storage density of the cofferdam pond is much higher, and the cost is reduced by nearly two thirds.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic cross-sectional view of one embodiment of the present application.
Fig. 2 is a schematic top view of the embodiment shown in fig. 1.
FIG. 3 is a schematic cross-sectional view of a semi-permeable membrane wall in one embodiment of the present application.
Fig. 4 is a schematic elevational view of a semi-permeable membrane wall in another embodiment of the present application.
Reference numerals:
1. cofferdam; 11. a fresh water zone; 12. a brine zone; 13. an isolation dam; 131. a flow-through channel; 14. a fresh water valve; 15. a brine valve; 2. a semi-permeable membrane wall; 21. an isolation gate; 22. a semi-permeable membrane plate; 23. a semi-permeable membrane cylinder; 24. a fresh water wall; 25. a brine wall; 251. a pressure tank; 3. a water turbine.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The application provides an embodiment of an energy storage type cofferdam 1 pond, which comprises a cofferdam 1, a semi-permeable membrane wall 2 and a water turbine 3.
The cofferdam 1 can be natural, but in general, a cement cofferdam 1 is constructed by itself, the center of the cofferdam 1 is divided into a saline area 12 and a fresh water area 11 by a separation dam 13, and the bottom of the separation dam 13 is also provided with a circulation channel 131 for communicating the saline area 12 and the fresh water area 11.
The semi-permeable membrane wall 2 is arranged on one side of the circulation channel 131 and used for providing a salt water filtering effect, the semi-permeable membrane wall 2 is arranged on one end, close to the salt water area 12, of the circulation channel 131 according to the flowing direction of the circulation channel 131, the isolation door 21 is arranged on one side, close to the fresh water area 11, of the semi-permeable membrane wall 2 in the vertical direction, specifically, the isolation door 21 slides up and down through a rail, in some embodiments, the lifting of the isolation door 21 is controlled through a lifting rope, and in some embodiments, the control is also performed through a submersible motor.
The hydraulic turbine 3 is disposed in the flow channel 131 in one or more numbers, and the hydraulic turbine 3 is used for receiving energy to pressurize the flow channel 131 or generate electricity.
In one embodiment, the semipermeable membrane wall 2 is formed by splicing a plurality of semipermeable membrane panels 22 in order to equalize the pressure received by the semipermeable membrane wall 2. Each semi-permeable membrane 22 is composed of an outer shell and a first inner membrane, the cross section of the outer shell is generally square, and in some embodiments is rectangular, and the main pressure of the semi-permeable membrane wall 2 exists near the semi-permeable membrane 22, so in some embodiments, in order to resist the pressure, the semi-permeable membrane 22 near the isolation dam 13 is generally laid more densely, and the part near the middle is laid sparsely, so that the peripheral stress with higher strength is larger, and the service life of the semi-permeable membrane wall 2 is prolonged.
Meanwhile, the semi-permeable membrane 22 is composed of a first inner membrane and a plate shell, the first inner membrane is a semi-permeable membrane with holes with the average pore diameter of 1nm uniformly distributed on the surface, the plate shell is wrapped outside the first inner membrane, holes with the average pore diameter of 0.5-2nm are uniformly distributed on two end faces of the plate shell for primarily filtering suspended matters and debris in water, and in order to improve strength, the plate shell is generally made of a ceramic material and is also made of a composite high polymer material in some embodiments.
Further, in order to disperse the pressure of the semi-permeable membrane wall 2, simultaneously also in order to keep higher infiltration and reverse osmosis effect after long-term use, the semi-permeable membrane wall 2 sets up multilayer structure, the quantity of the semi-permeable membrane wall 2 has a plurality ofly, the semi-permeable membrane wall 2 on the adjacent semi-permeable membrane wall 2 is crisscross to be set up, conveniently will permeate the water intensive mixing once, keep the stability of infiltration effect, after being used for avoiding a small amount of semi-permeable membrane plate 22 to damage, the semi-permeable membrane plate 22 of its relative position needs the too big damage that leads to the interlocking of filterable brine concentration, simultaneously in order to improve the bulk strength of all semi-permeable membrane walls 2, through the leg joint between the adjacent semi-permeable membrane wall 2.
In another embodiment of the structure, as shown in fig. 3, the semipermeable membrane wall 2 is formed by splicing a plurality of semipermeable membrane drums 23, the semipermeable membrane drums 23 have higher overall strength and can also play a certain supporting role, so that only one semipermeable membrane wall 2 can be arranged to resist a sufficiently high water pressure.
Meanwhile, the semi-permeable membrane drum 23 is composed of a drum-shaped drum shell, only two end faces of which have holes of 0.5-2mm, and are generally made of ceramic materials, two ends of the semi-permeable membrane drum 23 respectively point to the fresh water area 11 and the brine area 12, and a second inner die is arranged in the drum shell along the radial section.
For reasonable distribution of the saline pressure, as shown in fig. 3, in some preferred embodiments, the semi-permeable membrane wall 2 further comprises a fresh water wall 24 and a saline wall 25.
The fresh water wall 24 is close to the fresh water area 11, the brine wall 25 is close to the brine area 12, the brine wall 25 is provided with the pressure groove 251, the inner wall of the pressure groove 251 is embedded with the inner cylinder of the semipermeable membrane, and meanwhile, the pressure groove 251 is close to the isolation dam 13, so that the pressure can be distributed to four sides with higher strength in reverse pressurization and reverse osmosis, and the service life of the semipermeable membrane wall 2 is prolonged.
And another part of semi-permeable membrane cask 23 then one end stretches out fresh water wall 24, the other end passes through the support and connects in salt water wall 25, moisture concentrates the overhead tank 251 at first in the pressurized in-process like this, and then through inlaying partly semi-permeable membrane cask 23 reverse osmosis that establishes at the overhead tank 251 inner wall and get into between fresh water wall 24 and the salt water wall 25, and the rethread remaining semi-permeable membrane cask 23 gets into fresh water district 11, the pressure differential of secondary reverse osmosis is lower, makes the middle part pressure that receives like this less, and semi-permeable membrane wall 2 is higher in reverse osmosis in-process life. And the pressure is more even and gentle in the infiltration process, and the damage to the semi-permeable membrane wall 2 is less.
Preferably, the height of the isolation dam 13 is at least 5m higher than the highest water level of the fresh water zone 11 and the salt water zone 12 to prevent the water from overflowing the cofferdam 1 to cause energy loss, in order to avoid water level fluctuation caused by rain, evaporation and the like.
In some preferred embodiments, as shown in fig. 1, a fresh water valve 14 is disposed on one side of the cofferdam 1 close to the fresh water area 11, and the distance between the fresh water valve 14 and the bottom of the cofferdam 1 is a first preset height; a brine valve 15 is arranged on one side of the cofferdam 1 close to the brine area 12, and the distance between the brine valve 15 and the bottom of the cofferdam 1 is a second preset height.
The fresh water valve 14 and the brine valve 15 are used for helping fill brine and fresh water in the initial stage of the use of the cofferdam 1 and supplement brine and fresh water in the use of the cofferdam 1, and are used for calibrating the standard height of the water level of the brine area 12 and the fresh water area 11, under the influence of transpiration, rainfall and other factors, the moisture in the brine area 12 and the fresh water area 11 may deviate from the design conditions, the indication effect of the brine valve 15 and the fresh water valve 14 is achieved, and the water drainage or supplement work can be conveniently carried out by workers according to the height and the concentration of the brine area 12 and the fresh water area 11.
In order to avoid the destruction of the cofferdam 1, the site of the cofferdam 1 is often selected to be an open and unoccupied area, and therefore, since wind power conditions are naturally excellent, a wind turbine array is usually installed on the top of the cofferdam 13, and the wind turbine array is used to generate electricity, and at the same time, the wind turbine array is also connected to the water turbine 3, and excess electricity from the wind turbine array is accumulated by the water turbine 3, and the accumulated energy is converted back into electricity in the case of a lack of wind power.
The application also provides an embodiment of an energy storage method, comprising the following steps:
when the energy storage type cofferdam 1 pond is in an initial state, the isolating door 21 falls down to seal the flow channel 131, and simultaneously, the saline water area 12 is filled with the saline water, and the fresh water area 11 is filled with the fresh water;
when the energy storage type cofferdam 1 pond is in a power generation state, the isolating door 21 is completely lifted, water in the fresh water area 11 permeates into the brine area 12, a high-pressure cavity is formed in the flow channel 131, and the pressure difference between the high-pressure cavity and the brine area 12 drives the water turbine 3 to generate power;
when the energy storage type cofferdam 1 pond is in an energy storage state, the isolating door 21 is completely lifted, the water turbine 3 receives energy supply and presses salt water into the circulation channel 131 to form a high-pressure area, and water in the salt water enters the fresh water area 11 through the semipermeable membrane by reverse osmosis through the pressure difference between the high-pressure area and the fresh water area 11;
when the pond of the energy storage type cofferdam 1 is in an energy storage state and the osmotic pressure between the fresh water area 11 and the saline water area 12 reaches the preset osmotic pressure, the isolating door 21 falls down to seal the flow passage 131, and the water turbine 3 stops rotating.
When the method is applied to the embodiment of the energy storage type cofferdam 1 with the windmill array, the method also comprises the following steps:
when the power generation power of the windmill array reaches a first preset threshold value, the energy storage type cofferdam 1 pond enters an energy storage state, and the windmill array supplies power to the water turbine 3;
when the power generation power of the windmill array is lower than a first preset threshold value, the energy storage type cofferdam 1 pond enters a power generation state, the pressure difference between the high-pressure cavity and the brine area 12 drives the water turbine 3 to do work, and the water turbine 3 drives the windmill array to rotate to generate power.
The application also provides an embodiment of an energy storage method based on the embodiment of the energy storage type cofferdam 1 pond, which comprises the following steps:
when the energy storage cofferdam 1 pond is in an initial state, the isolating door 21 falls down to close the flow channel 131, and simultaneously, the brine valve 15 is used for filling brine into the brine area 12 until the brine is flush with the brine valve 15, and the fresh water valve 14 is used for filling fresh water into the fresh water area 11 until the fresh water is flush with the fresh water valve 14.
When the power generation power of the windmill array is lower than a first preset threshold value, the energy storage type cofferdam 1 pond enters a power generation state, at the moment, the isolating door 21 is completely lifted, the water in the fresh water area 11 permeates into the salt water area 12, a high-pressure cavity is formed in the flow passage 131, and the pressure difference between the high-pressure cavity and the salt water area 12 drives the water turbine 3 to generate power.
When the power generated by the windmill array reaches a first preset threshold value, the energy storage type cofferdam 1 pond enters an energy storage state, the isolating door 21 is completely lifted, the water turbine 3 receives energy supplied by the windmill array and presses salt water into the flow channel 131 to form a high-pressure area, and water in the salt water enters the fresh water area 11 through the semipermeable membrane by reverse osmosis through the pressure difference between the high-pressure area and the fresh water area 11.
When the pond of the energy storage type cofferdam 1 is in an energy storage state and the osmotic pressure between the fresh water area 11 and the brine area 12 reaches the preset osmotic pressure, the isolating door 21 falls down to seal the flow passage 131, the water turbine 3 stops running, water samples of the fresh water area 11 and the brine area 12 are collected at the moment to be detected and the mass concentration of the water samples is analyzed, if the mass concentration of the fresh water area 11 is too high, water needs to be added for dilution, if the mass concentration of the brine area 12 is too low, salt needs to be added, meanwhile, the water surface height of the fresh water area is also needed to be observed, and if the water surface height exceeds a certain range of the corresponding fresh water valve 14 and the brine valve 15, part of water needs to be removed.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention.
Claims (10)
1. An energy storage cofferdam pond, comprising:
the cofferdam (1) is divided into a fresh water area (11) and a salt water area (12) by a separation dam (13), and the bottom of the separation dam (13) is provided with a circulation channel (131) for communicating the fresh water area (11) with the salt water area (12);
the semi-permeable membrane wall (2) is arranged in the circulation channel (131) and close to one side of the fresh water area (11), an isolation door (21) is arranged on one side, close to the fresh water area (11), of the semi-permeable membrane wall (2) in a sliding mode along the vertical direction, and when the isolation door (21) completely falls down, the circulation channel (131) is completely sealed through the isolation door (21);
the water turbines (3) are arranged in the flow passage (131) and are one or more in number, and the water turbines (3) are used for receiving energy to pressurize the flow passage (131) or generate electricity by utilizing water flow of the fresh water area (11) flowing to the brine area (12).
2. The energy storage cofferdam pond of claim 1, wherein:
the semi-permeable membrane wall (2) is formed by splicing a plurality of semi-permeable membrane plates (22);
the semipermeable membrane plate (22) comprises:
the surface of the first inner membrane is uniformly provided with through holes with the average aperture of 1 nm;
and the plate shell is coated outside the first inner membrane, and holes with the average pore diameter of 0.5-2mm are uniformly distributed on two end faces of the plate shell.
3. The energy storage cofferdam pond of claim 2, wherein:
the number of the semi-permeable membrane walls (2) is more than one;
the semi-permeable membrane plates (22) on the adjacent semi-permeable membrane walls (2) are arranged in a staggered way;
the adjacent semipermeable membrane walls (2) are connected through a bracket.
4. The energy storage cofferdam pond of claim 1, wherein:
the semi-permeable membrane wall (2) is formed by splicing a plurality of semi-permeable membrane drums (23);
the semi-permeable membrane cylinder (23) comprises:
the two end surfaces of the barrel shell face the fresh water area (11) and the brine area (12) respectively, and holes with the average aperture of 0.5-2mm are uniformly distributed on the end surfaces;
and through holes with the average aperture of 1nm are uniformly distributed on the surface of the second inner membrane, and the barrel-type inner membrane is arranged in the barrel shell along the radial section.
5. The energy storage cofferdam pond of claim 4, wherein:
the semi-permeable membrane wall (2) further comprising:
a fresh water wall (24) proximate to the fresh water zone (11);
a brine wall (25) adjacent to the brine zone (12), the brine wall (25) being provided with a pressure groove (251) at a location adjacent to the isolation dam (13);
part of the semi-permeable membrane cylinder (23), one end part of which extends out of the pressure tank (251), and the other end of which is connected to the fresh water wall (24) through a bracket;
the other semi-permeable membrane cylinders (23) have one end extending out of the fresh water wall (24) and the other end connected to the saline wall (25) through a bracket.
6. The energy storage cofferdam pond of claim 1, wherein:
the height of the isolation dam (13) is at least 5m higher than the highest water level of the fresh water area (11) and the salt water area (12).
7. The energy storage cofferdam pond of claim 1, wherein:
a fresh water valve (14) is arranged on one side, close to the fresh water area (11), of the cofferdam (1), and the distance between the fresh water valve (14) and the bottom of the cofferdam (1) is a first preset height;
and a brine valve (15) is arranged on one side of the cofferdam (1) close to the brine area (12), and the distance between the brine valve (15) and the bottom of the cofferdam (1) is a second preset height.
8. The energy storage cofferdam pond of claim 1, wherein:
and the top of the isolation dam (13) is provided with a windmill array, and the windmill array is connected with the water turbine (3).
9. An energy storage method of an energy storage type cofferdam pond based on claim 1, characterized by comprising the following steps:
when the pond of the energy storage type cofferdam (1) is in an initial state, the isolating door (21) falls down to seal the flow channel (131), and meanwhile, saline water is filled into the saline water area (12) and fresh water is filled into the fresh water area (11);
when the energy storage type cofferdam (1) pond is in a power generation state, the isolating door (21) is completely lifted, water in the fresh water area (11) permeates into the brine area (12), a high-pressure cavity is formed in the flow passage (131), and the pressure difference between the high-pressure cavity and the brine area (12) drives the water turbine (3) to generate power;
when the pond of the energy storage type cofferdam (1) is in an energy storage state, the isolating door (21) is completely lifted, the water turbine (3) receives energy supply, the pressure of salt water is transferred into the flow channel (131) to form a high-pressure area, and the water in the salt water is subjected to reverse osmosis through the pressure difference between the high-pressure area and the fresh water area (11) and enters the fresh water area (11) through the semipermeable membrane;
when the pond of the energy storage type cofferdam (1) is in an energy storage state and the osmotic pressure between the fresh water area (11) and the salt water area (12) reaches the preset osmotic pressure, the isolating door (21) falls down to seal the circulation channel (131), and the water turbine (3) stops rotating.
10. The energy storage method of the energy storage type cofferdam pond as claimed in claim 1, wherein:
the top of the isolation dam (13) is provided with a windmill array, and the windmill array is connected with the water turbine (3);
also comprises the following steps:
when the power generation power of the windmill array reaches a first preset threshold value, the energy storage type cofferdam (1) pond enters an energy storage state, and the windmill array supplies power to the water turbine (3);
when the power generation power of the windmill array is lower than a first preset threshold value, the energy storage type cofferdam (1) pond enters a power generation state, the pressure difference between the high-pressure cavity and the brine area (12) drives the water turbine (3) to do work, and the water turbine drives the windmill array to rotate to generate power.
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