CN109970119B - Clean energy storage and seawater desalination co-production system and method - Google Patents
Clean energy storage and seawater desalination co-production system and method Download PDFInfo
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- CN109970119B CN109970119B CN201711464174.3A CN201711464174A CN109970119B CN 109970119 B CN109970119 B CN 109970119B CN 201711464174 A CN201711464174 A CN 201711464174A CN 109970119 B CN109970119 B CN 109970119B
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- 239000013535 sea water Substances 0.000 title claims abstract description 142
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 129
- 238000004146 energy storage Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title description 4
- 238000010248 power generation Methods 0.000 claims abstract description 193
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 230000009466 transformation Effects 0.000 claims abstract description 10
- 239000013505 freshwater Substances 0.000 claims description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 238000003860 storage Methods 0.000 claims description 28
- 238000001704 evaporation Methods 0.000 claims description 12
- 239000002918 waste heat Substances 0.000 claims description 11
- 230000008020 evaporation Effects 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 238000004821 distillation Methods 0.000 claims description 4
- 239000000284 extract Substances 0.000 claims 2
- 239000013589 supplement Substances 0.000 claims 2
- 238000012423 maintenance Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 230000035622 drinking Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003973 irrigation Methods 0.000 description 3
- 230000002262 irrigation Effects 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- -1 electricity Substances 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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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
- F03B13/06—Stations or aggregates of water-storage type, e.g. comprising a turbine and a pump
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/138—Water desalination using renewable energy
- Y02A20/141—Wind power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- Combustion & Propulsion (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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Abstract
The invention relates to the field of energy utilization, in particular to a clean energy storage and sea water desalination cogeneration system and method. According to the invention, wind power, photovoltaic power generation, tidal power generation and sea tide power generation are firstly adjusted through the power transmission and transformation system and then are transmitted to the power steam device, steam generated by the power steam device is transmitted to the power generation system to generate power so as to obtain electric energy with better electric energy quality, meanwhile, the steam power generation system is divided into the first power generation system and the second power generation system, electric energy of different power generation systems is provided for different objects according to requirements, and the control flexibility is increased. The invention effectively solves the problems of randomness and volatility of wind power, photovoltaic power generation, tidal power generation and sea tidal power generation, so that the co-produced seawater desalination system can stably operate, the operating efficiency of the system is improved, and resources are saved.
Description
Technical Field
The invention relates to the field of energy utilization, in particular to a clean energy storage and sea water desalination cogeneration system and method.
Background
Coastal areas are often places with abundant wind energy, photovoltaic energy and tidal energy, but the energy sources have the problems of uncontrollable, low quality of generated electric energy, high fluctuation and unstable output power, and the seawater desalination device used as a main cogeneration user generally needs a continuous and stable power supply, so that how to solve the contradiction becomes a research focus for applying clean energy technology to seawater desalination.
The application number 201410480835 discloses a pumped storage type wind energy direct-driven seawater desalination integrated system, which directly uses wind power to pump seawater for energy storage, and then uses the potential energy of the seawater to drive a reverse osmosis device to produce fresh water, so that the principle of the whole set of device is very simple. The defect is that an unnecessary standby power supply is not needed, if the wind driven generator cannot supply power for a long time, the whole device stops running after running for a period of time, and the seawater can corrode the reservoir.
Application number 201610010059.8 discloses a wind-light-pumping storage-seawater desalination composite system energy management method, which is characterized in that wind power, photovoltaic power generation, pumped storage and seawater desalination are separately managed, and when the wind power and photovoltaic power generation are sufficiently supplied, seawater is desalinated, pumped storage is performed, and even conventional loads are supplied; when the electric energy begins to drop, the seawater is supplied preferentially for desalination, and the pumped storage and the conventional load are stopped in sequence; when the electric energy is not enough to desalt the seawater, the pumped storage starts to generate electricity to ensure the seawater desalination.
Although the method solves the corrosion problem of the energy storage equipment by using fresh water energy storage, the seawater desalination system and the fresh water energy storage system are separately managed, and when the desalinated seawater is surplus, the desalinated seawater cannot be directly supplemented into the fresh water energy storage system. Wind power and photovoltaic power generation are directly supplied to a seawater desalination composite system and a conventional load for use, and the middle part does not need a power transformation link, so that the requirements of the seawater desalination system on the continuity and stability of a power supply cannot be met, and the normal operation of the seawater desalination system is influenced.
Disclosure of Invention
The invention aims to provide a clean energy storage and seawater desalination cogeneration system and a method, which are used for solving the problem that a power supply provided by a clean energy system for a seawater desalination system in the prior art is unstable.
In order to achieve the purpose, the invention provides a clean energy storage and sea water desalination cogeneration system, which comprises a system scheme I, wherein the system scheme I comprises a clean energy system, the clean energy system is connected with an electric steam device through a power transmission and transformation system, the electric steam device provides steam for a steam power generation system through a first gas transmission device, the steam power generation system provides electric energy and steam for a sea water desalination system through a power transmission system and a second gas transmission device respectively, and fresh water generated by the sea water desalination system is provided for a water pumping energy storage system through a liquid transmission device; the steam power generation system comprises a first power generation system and a second power generation system, and the first power generation system is connected with a power grid; the clean energy system comprises at least one of the following systems: wind power systems, photovoltaic power generation systems, tidal power generation systems, and ocean current power generation systems.
In the second system scheme, on the basis of the first system scheme, the fresh water generated by the seawater desalination system is also provided for the electric power steam device.
And on the basis of the first system scheme or the second system scheme, the seawater desalination system comprises a first seawater desalination system and a second seawater desalination system.
And in the fourth system scheme, on the basis of the third system scheme, the first seawater desalination system is a low-temperature multi-effect distillation system, and the second seawater desalination system is an evaporation system.
And on the basis of the fourth system scheme, the pumped storage system comprises a high-level reservoir, a low-level reservoir, a water pump device and a water wheel power generation device.
The invention also provides a clean energy storage and seawater desalination cogeneration method, which comprises the following steps:
the electric steam device generates steam by using electric energy provided by the clean energy system, and provides the steam for the first power generation system and the second power generation system to generate power;
the electric energy generated by the first power generation system is merged into a power grid, and when the electric energy of the power grid meets the requirement, the electric energy generated by the first power generation system is provided for the seawater desalination system and the pumped storage system;
the electric energy generated by the second power generation system is provided for the seawater desalination system and the pumped storage system;
the fresh water generated by the seawater desalination system is provided for the electric steam device and the pumped-storage system.
And in a second method scheme, on the basis of the first method scheme, the electric energy of the first power generation system and the second power generation system is supplied to the first seawater desalination system, and the steam passing through the first power generation system and the second power generation system is supplied to the first seawater desalination system and the second seawater desalination system.
In a third method, on the basis of the second method, when the steam generated by the electric steam device meets the requirements of the first power generation system and the second power generation system, the first power generation system and the second power generation system are both put into operation;
when the steam amount generated by the electric steam device is smaller than a first set value, reducing the steam amount conveyed to the second power generation system according to a set proportion;
when the steam generated by the electric steam device can only meet the first power generation system, the second power generation system is closed;
when the steam generated by the electric steam device is smaller than a second set value, the set number of set types of power generation devices in the first power generation system are closed;
shutting down the first power generation system when steam generated by the electric steam device cannot meet the demand of the first power generation system.
The invention has the beneficial effects that: wind power, photovoltaic power generation, tidal power generation and sea tide power generation are adjusted through a power transmission and transformation system firstly and then are transmitted to a power steam device, steam generated by the power steam device is transmitted to a steam power generation system to generate power so as to obtain electric energy with better electric energy quality, meanwhile, the steam power generation system is divided into a first power generation system and a second power generation system, the electric energy of different power generation systems is provided for different objects as required, the flexibility of control is increased, the problems of randomness and volatility of the wind power, the photovoltaic power generation, the tidal power generation and the sea tide power generation are effectively solved, and a co-production sea water desalination system can operate stably.
The invention also co-produces the seawater desalination system and the pumped storage system, and effectively combines the seawater desalination system and the pumped storage system, fresh water generated by the seawater desalination system can provide a water source for the pumped storage system and the electric power steam device, and electric energy generated by the pumped storage system can be merged into a power grid, so that the operation efficiency of the system is improved, and resources are saved.
Drawings
FIG. 1 is a block diagram of the architecture of the system of the present invention;
FIG. 2 is a diagram of the actual effect of the pumped-hydro energy storage section of the system of the present invention;
fig. 3 is a schematic view of the anti-evaporation of a portion of the reservoir of the pumped-hydro energy storage system of the present invention;
in the drawings: 1. a wind power system; 2. a photovoltaic power generation system; 3. a tidal power generation system; 4. a sea tide current power generation system; 5. a power transmission and transformation system; 6. an electric steam boiler; 7. a first power generation system; 8. a second power generation system; 9. a first seawater desalination system; 10. a second seawater desalination system; 11. a high-level artificial energy storage reservoir; 12. a hydro-generator; 13. a low-level artificial energy storage reservoir; 14. other uses such as drinking, irrigation, etc.; 15. a power grid; 16. a maintainer channel; 17. a water supply pipeline; 18. a water pump system; 19. supporting beam columns of the overhaul channel; 20. factory building; 21. a plant supporting beam column; 22. a waste heat circulating heating pipe; 23. a photovoltaic power generation panel; 24. a photovoltaic power generation panel base; 25. an evaporation prevention cloth; 26. and (4) side walls.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention provides a co-production energy storage power generation system for sea water desalination by comprehensively utilizing clean energy such as wind power, photovoltaic power generation, tidal power generation, sea tide power generation and the like, which can effectively solve the problems of randomness and fluctuation of electric energy of wind power generation, photovoltaic power generation, tidal power generation and sea tide power generation when the electric energy is used for sea water desalination, can realize effective energy storage and energy storage, and can solve the problems of water, electricity, gas and the like required by industrial sea water desalination.
As shown in fig. 1, the structure of the co-generation system for wind, light, tide and ocean current energy storage and sea water desalination is schematically illustrated, wherein the wind power system 1, the photovoltaic power generation system 2, the tide power generation system 3 and the sea current power generation system 4 are connected to an electric steam boiler 6 after passing through a power transmission and transformation system 5, the electric steam boiler 6 generates superheated steam to drive the steam power generation system to generate power under the action of electric energy, and the steam power generation system comprises a first power generation system 7 and a second power generation system 8.
The electric energy generated by the first power generation system 7 is preferentially supplied to the power grid 15, and only when the electric energy of the power grid 15 is surplus, the required electric energy is supplied to the first seawater desalination system 9 and the second seawater desalination system 10 and the required electric energy is supplied to the pumped storage. The second power generation system 8 is mainly used for consuming the periodic peak power generated by the photovoltaic power generation 2, and the generated power is mainly provided for the power required by seawater desalination and the power required by pumped storage.
The waste heat required by the sea water desalination generated by the first power generation system 7 and the second power generation system 8 is respectively supplied to the first sea water desalination system 9 and the second sea water desalination system 10, and the electric energy required by the sea water desalination generated by the first power generation system 7 and the second power generation system 8 is completely supplied to the first sea water desalination system 9.
Fresh water produced by the first seawater desalination system 9 and the second seawater desalination system 10 is preferentially supplied to the electric steam boiler 6, water consumption of the high-level and low-level artificial energy storage reservoirs 11 and 13 is ensured, and the fresh water is finally used for other purposes 14 such as drinking, irrigation and the like; water in the high-level artificial energy storage reservoir 11 is converted into electric energy through the hydraulic generator 12 for grid connection 15, and then flows into the low-level artificial energy storage reservoir 13.
As shown in fig. 2, which is a diagram of the practical effects of the pumped storage part, when the first power generation system 7 and the second power generation system 8 provide power, the water pump system 18 pumps the fresh water generated by the first seawater desalination system 9 and the second seawater desalination system 10 and the stored water in the low artificial energy storage reservoir 13 to replenish the high artificial energy storage reservoir 11.
When the hydraulic generator 12 is required to be merged into the power grid 15 for working, the high-level artificial energy storage reservoir 11 can ensure that the hydraulic generator 12 normally works for more than 10 hours, and the discharged fresh water enters the low-level artificial energy storage reservoir 13.
When the first seawater desalination system 9 and the second seawater desalination system 10 are normally operated and the water pump system 18 is not operated, the produced fresh water flows into the low-level artificial energy storage reservoir 13.
The second seawater desalination system 10 can be independent of the power generation system to provide electric energy, only the fresh water flowing out of the high-level artificial energy storage reservoir 11 passes through a condenser of the second seawater desalination system 10, and the fresh water can be prepared by condensing the steam generated by the seawater heated by the waste heat required by seawater desalination; and the fresh water flowing through the condenser will also flow into the low level artificial energy storage reservoir 13.
In order to reduce the evaporation of water vapor of the high-level and low-level artificial energy storage reservoirs 11 and 13, a photovoltaic power generation panel base 24 is arranged on the maintenance personnel channel 16 in the reservoir, a photovoltaic solar cell panel 23 capable of shading light is arranged on the photovoltaic power generation panel base 24, and meanwhile, the artificial energy storage reservoir is provided with the channel 16 which is convenient for personnel to maintain in order to maintain the photovoltaic solar cell panels 23 conveniently.
The maintenance personnel channel 16 arranged in the high-level artificial energy storage reservoir 11 on the ceiling of the plant 20 has additional engineering requirements, and besides meeting normal personnel maintenance, the maintenance personnel channel also has the function of assisting in reinforcing the side wall of the high-level artificial energy storage reservoir 11.
And a maintenance passage supporting beam column 19 is extended out of the upper part of the plant supporting beam column 21 below the maintenance passage 16 to support and fix the maintenance passage 16, and then the maintenance passage 16 is used for fixing the side wall of the high-level artificial energy storage reservoir 11.
When the first power generation system 7 and the second power generation system 8 provide electric energy and heat energy, the first seawater desalination system 9 and the second seawater desalination system 10 begin to desalinate a large batch of seawater, at the moment, the water pump system 18 is started, fresh water is extracted from the first seawater desalination system 9, the second seawater desalination system 10 and the low-level artificial energy storage reservoir 13, and is injected into the high-level artificial energy storage reservoir 11 through the water feeding pipeline 17. When the water pump system 18 stops working, the fresh water produced by the first seawater desalination system 9 and the second seawater desalination system 10 is discharged into the low-level artificial energy storage reservoir 13 along the lower segment of the upper water pipeline 17.
When the hydraulic generator 12 is required to be merged into the power grid 15 for working, the high-level artificial energy storage reservoir 11 can ensure that the hydraulic generator 12 normally works for more than 10 hours, and the discharged fresh water enters the low-level artificial energy storage reservoir 13.
The second seawater desalination system 10 can produce fresh water by condensing the steam generated by the seawater heated by the waste heat required for seawater desalination by only using the fresh water flowing out of the high-level artificial energy storage reservoir 11 through the condenser of the second seawater desalination system 10 without depending on the electric energy provided by the power generation system. And the fresh water flowing through the condenser will also flow into the low level artificial energy storage reservoir 13.
As shown in fig. 3, in order to reduce the evaporation of water in the artificial energy storage reservoir, an evaporation prevention cloth 25 is arranged on the fresh water liquid level of the high-level and low-level artificial energy storage reservoirs 11 and 13 to reduce the wind energy to blow away water vapor and the sunlight to evaporate water vapor.
Since the space between the man access passages 16 is small, the area of the evaporation-preventing cloth 25 cannot be made very large, which effectively prevents the evaporation-preventing cloth from being damaged by wind, and a side wall 26 is also shown in fig. 3.
The first power generation system and the second power generation system comprise steam turbines, clean energy such as wind power, photovoltaic power generation, tidal power generation, sea tide power generation and the like is used for boiling water to generate steam through necessary power transformation through a special power grid, and then the steam is supplied to the steam turbines to generate power.
Wind power PfPhotovoltaic power generation PgTidal power generation PcPower generation by sea currenthWhen clean energy is preferentially supplied to a steam turbine for power generation, a peak shaving system is arranged in a factory,the first power generation system is mainly used for grid-connected power generation, so wind power PfPhotovoltaic power generation PgTidal power generation PcPower generation by sea currenthThe superheated steam generated by the electric steam device by the clean energy is preferentially supplied to the first power generation system, and the superheated steam cannot be digested in the first power generation system, such as photovoltaic power generation PgAnd tidal power generation PcGenerated periodic electric energy and consumed wind power PfPower generation by sea currenthAnd when the non-periodic electric energy wave crest is met, the second power generation system is put into operation. The principle of power generation supply is that high-quality and stable electric energy provided by the first power generation system is preferentially connected to the grid, and the second power generation system provides intermittent and unstable electric energy to supply the seawater desalination system and the pumped storage system.
The invention is characterized in that the first power generation system or the second power generation system can comprise turbines with different power, or a plurality of turbines with the same power can generate power according to the working interval. When clean energy such as wind power, photovoltaic power generation, tidal power generation, sea tide power generation and the like provides electric energy which exceeds the power generation requirement of the first power generation system, redundant electric energy generated by the second power generation system is provided for the sea water desalination system and the pumped storage system.
When four kinds of clean energy are introduced into the power generation system through the power transformation rectification and the steam device, 16 cases as shown in table 1 occur according to whether the power provided by each kind of clean energy is sufficient or not.
The upward arrows in table 1 indicate that the energy power provided by the corresponding clean energy source is sufficient, and the downward arrows indicate that the energy power provided by the corresponding clean energy source is insufficient.
TABLE 1 Power State Table for four clean energy sources
| Serial number | Power state | Representing symbol | Serial number | Power state | Representing symbol |
| 1 | Pf↑+Pg↑+Pc↑+Ph↑ | 4 | 9 | Pf↓+Pg↓+Pc↑+Ph↑ | 2 |
| 2 | Pf↑+Pg↑+Pc↑+Ph↓ | 3 | 10 | Pf↓+Pg↑+Pc↓+Ph↑ | 2 |
| 3 | Pf↓+Pg↑+Pc↑+Ph↑ | 3 | 11 | Pf↓+Pg↑+Pc↑+Ph↓ | 2 |
| 4 | Pf↑+Pg↓+Pc↑+Ph↑ | 3 | 12 | Pf↑+Pg↓+Pc↓+Ph↓ | 1 |
| 5 | Pf↑+Pg↑+Pc↓+Ph↑ | 3 | 13 | Pf↓+Pg↓+Pc↓+Ph↑ | 1 |
| 6 | Pf↑+Pg↓+Pc↑+Ph↓ | 2 | 14 | Pf↓+Pg↑+Pc↓+Ph↓ | 1 |
| 7 | Pf↑+Pg↓+Pc↓+Ph↑ | 2 | 15 | Pf↓+Pg↓+Pc↑+Ph↓ | 1 |
| 8 | Pf↑+Pg↑+Pc↓+Ph↓ | 2 | 16 | Pf↓+Pg↓+Pc↓+Ph↓ | 0 |
The situation that all power states of 4 clean energy sources are redundant is 1; the power states of 3 clean energy sources are redundant, and 4 clean energy sources are available; the 2 clean energy power states are redundant, and 6 clean energy power states are redundant; the power states of 1 clean energy are redundant, and 4 clean energy states are redundant; 1, the power states of clean energy are not surplus; however, the installed capacities of the 4 kinds of clean energy are not necessarily the same, so that the total power state P of the clean energy can be determined according to the total power state P of the clean energyzAnd making a proper power generation working interval.
Setting the required power of the first power generation system and the second power generation system as P1And P2The method specifically comprises the following steps: when P is presentz＜P1+P2And P isz＞P1When is, PzThe superheated steam generated by the heating is enough for the first power generation system and the second power generation system to be put into operation at the same time; when P is presentzWhen the power generation system descends, the generated superheated steam is reduced, the consumption of the superheated steam of the second power generation system is gradually reduced, and the first power generation system is preferentially ensured to generate power.
When P is presentz＜P1When is, PzThe superheated steam generated by the heating can only maintain the first power generation system, and the second power generation system is closed; when P is presentzContinuing to descend, if the first power generation system comprises two turbines with different powers, closing the turbine with high power, and opening the turbine with low power; if the power of the turbines is the same, the turbines are closed progressively, so that the stability of the quality of the electric energy is ensured.
When P is presentz＜P1When, if P iszThe superheated steam generated by the heating can maintain the normal work of one steam turbine, but the electric energy is unstable, and the generated energy is completely supplied to a seawater desalination system and pumped storage.
When P is presentzAnd if the superheated steam generated by the added heat cannot maintain the normal work of one turbine, all the turbines are closed, and heat is only supplied to the second seawater desalination system.
The power generated by the first power generation system is preferably connected to the grid, and the power generated by the second power generation system is used for a seawater desalination system or fresh water energy storage. When the electric energy of the power grid is surplus and the first power generation system is not needed to be connected to the grid for power generation, the electric energy generated by the first power generation system is also used for a seawater desalination system and fresh water energy storage.
The electric energy generated by the steam turbine and the generated waste heat are provided for a seawater desalination system to carry out seawater desalination treatment.
The fresh water converted by the seawater desalination system is preferentially supplied to an electric steam device for demand, and then the water of the artificial energy storage reservoir is ensured, and finally the fresh water is used for drinking and irrigation.
In order to comprehensively utilize land resources, the invention can establish an overground high-level artificial energy storage reservoir and a low-level reservoir under the condition that the energy storage reservoir and the low-level reservoir are established according to mountain conditions without conditions. For example, a high-level artificial energy storage reservoir is arranged on the ceiling of a seawater desalination plant.
The invention recommends a miniature reservoir with a storage capacity of 54 ten thousand meters3The reference size is 300m (length) × 300m (width) × 6m (depth). The flow rate is 10m3And/s, the installed power is about 735 KW.
Because the ideal theoretical installed power of the hydro-generator has the formula: head (m) × flow (m)3Power (KW) x 9.8. And the conversion rate of the stored water and the stored energy is about 75 percent approximately, namely 'four extraction and three extraction'. Therefore, the high-level artificial energy storage reservoir recommended by the invention is arranged on the ceiling of a seawater desalination plant with the height of 10 meters (about three floors), and can ensure a water head of more than 10 meters; the reservoir capacity is designed according to the design that 10-hour power generation can be guaranteed.
In the invention, the actual engineering is considered that the high-level artificial energy storage reservoir is larger than the micro reservoir recommended by the invention in storage capacity and size, in order to bear the storage pressure of the artificial energy storage reservoir, the bearing structure and water seepage prevention need to be considered in the factory building design of a seawater desalination plant, and the invention recommends a multi-support beam column small-span structure.
The invention aims to reduce the evaporation of water vapor of a high-level artificial energy storage reservoir and a low-level artificial energy storage reservoir. The photovoltaic solar panels capable of shading light are arranged in the reservoir, and meanwhile, a channel convenient for personnel to overhaul is arranged in the artificial energy storage reservoir for conveniently overhauling the photovoltaic solar panels.
The invention has additional engineering requirements on the personnel overhaul channel of the high-level artificial energy storage reservoir arranged on the factory ceiling, and has the function of assisting in reinforcing the side wall of the high-level artificial energy storage reservoir besides meeting the normal personnel overhaul.
The seawater desalination system is divided into two parts, namely a first seawater desalination system and a second seawater desalination system; the first seawater desalination system uses a common mature low-temperature multi-effect distillation technology, and waste hot gas and electric energy of a steam turbine are mainly provided by a first power generation system and a second power generation system; the second seawater desalination system adopts the traditional evaporation technology (condenser) and is mainly used for digesting the waste hot gas of the steam turbine generated by the first power generation system and the second power generation system without consuming electric energy.
The second seawater desalination system uses the waste heat circulating heating pipe to heat seawater, so that water vapor evaporated by the waste heat circulating heating pipe meets a condenser filled with fresh water and finally flows into the collecting tank. And the fresh water in the condenser comes from the high-level artificial energy storage reservoir and flows to the low-level artificial energy storage reservoir by virtue of potential energy.
When the power plant encounters special weather such as typhoon and the like, clean energy such as wind power, photovoltaic power generation, tidal power generation, sea tide power generation and the like cannot be obtained, the fresh water energy storage can still ensure 10-hour electric energy supply.
The specific implementation mode related to the invention is given above, and the wind power, the photovoltaic power generation, the tidal power generation and the sea tide power generation are firstly adjusted by the power transmission and transformation system and then are transmitted to the power steam device, and the steam generated by the power steam device is transmitted to the power generation system for power generation, so that the electric energy with better electric energy quality is obtained.
The invention is not limited to the described embodiments, such as increasing the number of power generation systems or seawater desalination systems, and the technical solution formed by fine tuning the above-mentioned embodiments still falls within the scope of the invention.
Claims (5)
1. A clean energy storage and sea water desalination cogeneration system is characterized in that: the system comprises a clean energy system, wherein the clean energy system is connected with an electric steam device through a power transmission and transformation system in a power supply manner, the electric steam device provides steam for a steam power generation system through a first gas conveying device, the steam power generation system provides electric energy and steam for a seawater desalination system through a power transmission system and a second gas conveying device respectively, the seawater desalination system comprises a first seawater desalination system and a second seawater desalination system, the first seawater desalination system is a low-temperature multi-effect distillation system, the second seawater desalination system is an evaporation system, fresh water generated by the seawater desalination system is provided for a pumped storage system through a liquid conveying device, and the pumped storage system comprises a high reservoir, a low reservoir, a water pump device and a water turbine power generation device; the steam power generation system comprises a first power generation system and a second power generation system, the first power generation system is connected with a power grid, and when the first power generation system and the second power generation system provide electric energy, the water pump system extracts fresh water generated by the first seawater desalination system and the second seawater desalination system and water stored in the low-level artificial energy storage reservoir and supplements the fresh water and the water stored in the high-level artificial energy storage reservoir; water in the high-level artificial energy storage reservoir is converted into electric energy through a hydraulic generator for grid connection, and then flows into the low-level artificial energy storage reservoir; the first power generation system and the second power generation system comprise steam turbines, the electric energy generated by the steam turbines and the generated waste heat are supplied to the seawater desalination system for seawater desalination treatment, and the second seawater desalination system condenses steam generated by seawater heated by the waste heat required by seawater desalination to prepare fresh water by using fresh water flowing out from the high-level artificial energy storage reservoir through a condenser of the second seawater desalination system; when superheated steam generated by the heating in the total power state of the clean energy cannot maintain normal operation of one turbine, all the turbines are closed, and only the second seawater desalination system is supplied with heat; arranging anti-evaporation cloth on the fresh water liquid level of the high-level reservoir and the low-level reservoir; the clean energy system comprises at least one of the following systems: wind power systems, photovoltaic power generation systems, tidal power generation systems, and ocean current power generation systems.
2. The clean energy storage and seawater desalination cogeneration system of claim 1, wherein: the fresh water produced by the seawater desalination system is also provided to the electric steam device.
3. A clean energy storage and seawater desalination cogeneration method is characterized by comprising the following steps:
the electric steam device generates steam by using electric energy provided by the clean energy system, and provides the steam for the first power generation system and the second power generation system to generate power;
the electric energy generated by the first power generation system is merged into a power grid, and when the electric energy of the power grid meets the requirement, the electric energy generated by the first power generation system is provided for the seawater desalination system and the pumped storage system;
the electric energy generated by the second power generation system is provided for the seawater desalination system and the pumped storage system;
fresh water generated by the seawater desalination system is provided for the electric steam device and the pumped-storage system; the seawater desalination system comprises a first seawater desalination system and a second seawater desalination system, the first seawater desalination system is a low-temperature multi-effect distillation system, the second seawater desalination system is an evaporation system, and the pumped storage system comprises a high-level reservoir, a low-level reservoir, a water pump device and a water wheel power generation device;
when the first power generation system and the second power generation system provide electric energy, the water pump system extracts fresh water generated by the first seawater desalination system and the second seawater desalination system and water stored in the low-level artificial energy storage reservoir and supplements the fresh water and the water stored in the high-level artificial energy storage reservoir;
water in the high-level artificial energy storage reservoir is converted into electric energy through a hydraulic generator for grid connection, and then flows into the low-level artificial energy storage reservoir;
the first power generation system and the second power generation system comprise steam turbines, the electric energy generated by the steam turbines and the generated waste heat are supplied to the seawater desalination system for seawater desalination treatment, and the second seawater desalination system condenses steam generated by seawater heated by the waste heat required by seawater desalination to prepare fresh water by using fresh water flowing out from the high-level artificial energy storage reservoir through a condenser of the second seawater desalination system;
when superheated steam generated by the heating in the total power state of the clean energy cannot maintain normal operation of one turbine, all the turbines are closed, and only the second seawater desalination system is supplied with heat;
and anti-evaporation cloth is arranged on the fresh water liquid level of the high-level reservoir and the low-level reservoir.
4. The clean energy storage and seawater desalination cogeneration method according to claim 3, characterized in that: the electric energy of the first power generation system and the second power generation system is provided for the first seawater desalination system, and the steam passing through the first power generation system and the second power generation system is provided for the first seawater desalination system and the second seawater desalination system.
5. The clean energy storage and seawater desalination cogeneration method according to claim 4, characterized in that: when the steam generated by the electric steam device meets the requirements of the first power generation system and the second power generation system, the first power generation system and the second power generation system are both put into operation;
when the steam amount generated by the electric steam device is smaller than a first set value, reducing the steam amount conveyed to the second power generation system according to a set proportion;
when the steam generated by the electric steam device can only meet the first power generation system, the second power generation system is closed;
when the steam generated by the electric steam device is smaller than a second set value, the set number of set types of power generation devices in the first power generation system are closed;
shutting down the first power generation system when steam generated by the electric steam device cannot meet the demand of the first power generation system.
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