CN111463806B - Electric power energy storage peak shaving system - Google Patents
Electric power energy storage peak shaving system Download PDFInfo
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- CN111463806B CN111463806B CN202010326202.0A CN202010326202A CN111463806B CN 111463806 B CN111463806 B CN 111463806B CN 202010326202 A CN202010326202 A CN 202010326202A CN 111463806 B CN111463806 B CN 111463806B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
- H02J15/006—Systems for storing electric energy in the form of pneumatic energy, e.g. compressed air energy storage [CAES]
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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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Abstract
The invention relates to a power energy storage peak shaving system, which is respectively connected with a power generation system and a power grid, and comprises: a relay storage tank for storing low-temperature and low-pressure gas; the gas compressor is respectively connected with the power generation system and the relay storage tank and is used for compressing the low-temperature low-pressure gas according to first power provided by the power generation system to obtain low-temperature high-pressure gas; the storage module is connected with the gas compressor and used for storing the low-temperature high-pressure gas; the power module is connected with the storage module and used for converting second power into electric energy to be merged into the power grid, and the second power is kinetic energy released when the low-temperature high-pressure gas is reduced into the low-temperature low-pressure gas; the low-temperature low-pressure gas contains a small amount of N2CO of2And the low-temperature and low-pressure gas is obtained from flue gas. The invention has simple structure, high efficiency, low cost and environmental protection.
Description
Technical Field
The invention relates to the technical field of power peak shaving, in particular to a power energy storage peak shaving system.
Background
With the rapid development of social economy, the electricity consumption of society increases year by year, the traditional chemical energy source exerts greater and greater pressure on the environment, and in order to reduce the electricity consumption pressure and the environmental pressure, the new energy power generation gradually replaces the traditional power generation, wherein the new energy power generation mainly comprises wind power generation and solar power generation.
The main defect of wind power generation and solar power generation is their instability, which is very unstable along with fluctuation of factors such as climate, environment and the like. Instability of wind power generation and solar power generation is an industrial problem, and in order to solve the problem, a power generation energy storage peak shaving system needs to be developed.
The existing energy storage peak regulation system applied to wind power generation and solar power generation mostly adopts compressed air as an energy storage medium, and in the peak period of power generation, the surplus electric energy is used for compressing air, so that the surplus electric energy is stored. In the power generation valley period, the compressed air expands to push the generator to do work and provide extra power to make up the deficiency of the generated energy.
The existing power generation and energy storage system has the following defects: 1) the compressed air is used for storing energy, an air storage chamber, a heat exchanger, a heat storage device and the like are needed, the system is complex, and the space of the air storage chamber is limited; 2) the compressed air is used for storing energy, so that secondary utilization of the flue gas discharged by a coal-fired power plant and emission reduction of greenhouse gas cannot be realized; 3) to compress CO2Energy storage needs to ensure CO2Source, and production of CO2The cost is high.
Disclosure of Invention
The invention aims to provide an electric energy storage peak regulation system which is simple in structure, high in efficiency and low in cost.
In order to achieve the purpose, the invention provides the following scheme:
a power storage peak shaving system, respectively connected to a power generation system and a power grid, the power storage peak shaving system comprising:
a relay storage tank for storing low-temperature and low-pressure gas;
the gas compressor is respectively connected with the power generation system and the relay storage tank and is used for compressing the low-temperature low-pressure gas according to first power provided by the power generation system to obtain low-temperature high-pressure gas;
the storage module is connected with the gas compressor and used for storing the low-temperature high-pressure gas;
the power module is connected with the storage module and used for converting second power into electric energy to be merged into the power grid, and the second power is kinetic energy released when the low-temperature high-pressure gas is reduced into the low-temperature low-pressure gas;
the low-temperature low-pressure gas contains a small amount of N2CO of2And the low-temperature and low-pressure gas is obtained from flue gas.
Preferably, the system further comprises:
a pressure sensor located within the relay tank for detecting a pressure within the relay tank;
the relay storage tank is provided with a first valve, a second valve and a third valve, and the first valve is positioned at the set height of the relay storage tank; the second valve is located at an upper end of the relay storage tank; the third valve is positioned at the lower end part of the relay storage tank;
injecting the flue gas into the relay storage tank through the first valve, and when the pressure in the relay storage tank is greater than or equal to a pressure set value, opening the second valve to release N in the flue gas2Retaining CO in said flue gas2At this time, the CO2In which a small amount of N is contained2Forming said low temperature, low pressure gas.
Preferably, the storage module is an underground gas storage space.
Preferably, the underground gas storage space is any one of an underground aquifer, an underground salt cavern and a waste coal mine.
Preferably, the power module is further connected to the relay storage tank, the low-temperature high-pressure gas provides the second power to the power module and then is reduced into the low-temperature low-pressure gas, and the reduced low-temperature low-pressure gas is injected into the relay storage tank for recycling.
Preferably, the power module comprises:
the expansion machine is respectively connected with the storage module and the relay storage tank, and is used for expanding and applying work by utilizing kinetic energy released when the low-temperature high-pressure gas is converted into the low-temperature low-pressure gas, and injecting the low-temperature low-pressure gas into the relay storage tank for recycling; the kinetic energy is the second power;
the expander expands to do work to drive the generator to do work to generate electric energy, and meanwhile, the electric energy is merged into the power grid.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention relates to a power energy storage peak shaving system, which is respectively connected with a power generation system and a power grid, and comprises: a relay storage tank for storing low-temperature and low-pressure gas; the gas compressor is respectively connected with the power generation system and the relay storage tank and is used for compressing the low-temperature low-pressure gas according to first power provided by the power generation system to obtain low-temperature high-pressure gas; the storage module is connected with the gas compressor and used for storing the low-temperature high-pressure gas; the power module is connected with the storage module and used for converting second power into electric energy to be merged into the power grid, and the second power is kinetic energy released when the low-temperature high-pressure gas is reduced into the low-temperature low-pressure gas; the low-temperature low-pressure gas contains a small amount of N2CO of2And the low-temperature and low-pressure gas is obtained from flue gas. The invention has simple structure, high efficiency, low cost and environmental protection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an electric power energy storage peak shaving system of the invention.
Description of the symbols:
1-relay storage tank, 2-power generation system, 3-gas compressor, 4-storage module, 5-power module, 6-power grid, 51-expander, 52-generator.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The invention aims to provide an electric energy storage peak regulation system which is simple in structure, high in efficiency and low in cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the present invention provides a power storage peak shaving system, which is respectively connected with a power generation system 2 and a power grid 6, and the power storage peak shaving system comprises: a relay storage tank 1, a gas compressor 3, a storage module 4 and a power module 5.
The relay storage tank 1 is used to store low-temperature and low-pressure gas. In this embodiment, the low-temperature and low-pressure gas contains a small amount of N2CO of2. The gas compressor 3 is connected with the power generation system 2 and is connected with the relay storage tank 1 through a third valve, and the gas compressor 3 is used for compressing low-temperature low-pressure gas according to first power provided by the power generation system 2 to obtain low-temperature high-pressure gas. The high pressure is a pressure greater than or equal to 10 MPa. The third valve is located at a lower end portion of the relay storage tank.
The storage module 4 is connected with the gas compressor 3, and the storage module 4 is used for storing the low-temperature high-pressure gas.
In this embodiment, the storage module 4 is an underground gas storage space, specifically, any one of an underground aquifer, an underground salt cavern and a waste coal mine.
The power module 5 is connected with the storage module 4, the power module 5 is used for converting second power into electric energy and merging the electric energy into the power grid 6, and the second power is kinetic energy released when the low-temperature high-pressure gas is reduced into the low-temperature low-pressure gas.
As an alternative embodiment, the power module 5 of the present invention comprises: an expander 51 and a generator 52.
The expansion machine 51 is respectively connected with the storage module 4 and the relay storage tank 1, and the expansion machine 51 is used for expanding and applying work according to kinetic energy released when the low-temperature high-pressure gas is converted into the low-temperature low-pressure gas, and injecting the low-temperature low-pressure gas into the relay storage tank 1 for recycling; the kinetic energy is the second power.
The generator 52 is respectively connected with the expander 51 and the power grid 6, and the expander 51 expands to apply work to drive the generator 52 to apply work to generate electric energy, and simultaneously the electric energy is merged into the power grid 6.
The principle of obtaining the low-temperature and low-pressure gas is as follows:
a pressure sensor is provided in the relay tank 1 to detect the pressure in the relay tank 1.
A first valve is arranged at the set height of the relay storage tank 1, and a second valve is arranged at the upper end of the relay storage tank; in this embodiment, the first valve is located in a middle region of the relay storage tank 1. Through first valve to inject into in the relay storage jar 1 the flue gas, in this embodiment, the flue gas is the flue gas that coal fired power plant discharged. The flue gas discharged by the coal-fired power plant is the flue gas subjected to dust removal and desulfurization treatment, and the main component of the flue gas is CO2And N2. When the pressure in the relay storage tank 1 is greater than or equal to a pressure set value, the second valve is opened due to CO2Has a density higher than N2Density of the upper part of the relay tank, N2Will be discharged into the air and CO2Left in the relay storage tank 1; at this time, CO2Will contain a small amount of N2And generating the low-temperature and low-pressure gas. By mixing N in the flue gas2Discharging into air while retaining CO2The environment can be better protected, and the greenhouse effect cannot be aggravated. CO22In which a small amount of N is contained2The system operation is not affected.
In this embodiment, the pressure set value in the relay tank 1 is 5 MPa.
The specific working principle of the invention is as follows:
when the power generation system 2 is in a peak of power generation, the low-temperature and low-pressure gas stored in the relay storage tank 1 is compressed by using surplus electric energy and then stored in the storage moduleAnd 4, storing. The compressed CO stored in the storage module 4 when the power generation system 2 is at a power generation valley2Releasing energy to drive the generator 53 to generate electricity to be merged into the power grid 6.
The invention is to compress CO2As a storage medium of the surplus electric energy of the power generation system, not only CO can be realized2Reducing emission and slowing down CO2The greenhouse effect caused by the method can also absorb the surplus electric energy during the peak time of power generation and release the surplus electric energy during the valley time of power generation, thereby solving the problems of uneven generated energy and difficult grid connection of a power generation system. The invention directly introduces the flue gas discharged by the coal-fired power plant into the relay storage tank and utilizes N2And CO2The density difference realizes N in the smoke2And CO2Without additional CO2The trapping device effectively reduces the running cost of the system.
The invention uses underground gas storage space (such as underground aquifer, underground salt cavern, abandoned coal mine, exhausted oil-gas field and the like) to store energy storage medium, has large space, does not need to build energy storage medium storage facilities such as gas storage tanks and the like, and reduces the construction cost.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist understanding of the system and its core concepts; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (3)
1. An electric power energy storage peak shaving system, is connected with power generation system and electric wire netting respectively, its characterized in that, electric power energy storage peak shaving system includes:
a relay storage tank for storing low-temperature and low-pressure gas;
the gas compressor is respectively connected with the power generation system and the relay storage tank and is used for compressing the low-temperature low-pressure gas according to first power provided by the power generation system to obtain low-temperature high-pressure gas;
the storage module is connected with the gas compressor and used for storing the low-temperature high-pressure gas;
the power module is connected with the storage module and used for converting second power into electric energy to be merged into the power grid, and the second power is kinetic energy released when the low-temperature high-pressure gas is reduced into the low-temperature low-pressure gas;
the low-temperature low-pressure gas contains a small amount of N2CO of2The low-temperature and low-pressure gas is obtained from flue gas; the flue gas is discharged by a coal-fired power plant;
the system further comprises:
a pressure sensor located within the relay tank for detecting a pressure within the relay tank;
the relay storage tank is provided with a first valve, a second valve and a third valve, and the first valve is positioned at the set height of the relay storage tank; the second valve is located at an upper end of the relay storage tank; the third valve is positioned at the lower end part of the relay storage tank;
injecting the flue gas into the relay storage tank through the first valve, and when the pressure in the relay storage tank is greater than or equal to a pressure set value, opening the second valve to release N2 in the flue gas and retain CO2 in the flue gas, wherein the CO2 contains a small amount of N2 to form the low-temperature and low-pressure gas;
the storage module is an underground gas storage space;
the underground gas storage space is any one of an underground aquifer, an underground salt cavern and a waste coal mine.
2. The electric power energy storage peak shaving system according to claim 1, wherein the power module is further connected to the relay storage tank, the low-temperature high-pressure gas provides the second power to the power module and then is reduced into the low-temperature low-pressure gas, and the reduced low-temperature low-pressure gas is injected into the relay storage tank for recycling.
3. An electric power storage peaking system according to claim 2, wherein the power module includes:
the expansion machine is respectively connected with the storage module and the relay storage tank, and is used for expanding and applying work by utilizing kinetic energy released when the low-temperature high-pressure gas is converted into the low-temperature low-pressure gas, and injecting the low-temperature low-pressure gas into the relay storage tank for recycling; the kinetic energy is the second power;
the expander expands to do work to drive the generator to do work to generate electric energy, and meanwhile, the electric energy is merged into the power grid.
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| CN202010326202.0A CN111463806B (en) | 2020-04-23 | 2020-04-23 | Electric power energy storage peak shaving system |
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| CN202010326202.0A CN111463806B (en) | 2020-04-23 | 2020-04-23 | Electric power energy storage peak shaving system |
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| CN114087901B (en) * | 2020-08-05 | 2024-04-23 | 中节能国机联合电力(宁夏)有限公司 | High-temperature flue gas heat storage system |
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| US6877322B2 (en) * | 2002-09-17 | 2005-04-12 | Foster Wheeler Energy Corporation | Advanced hybrid coal gasification cycle utilizing a recycled working fluid |
| US7416716B2 (en) * | 2005-11-28 | 2008-08-26 | Air Products And Chemicals, Inc. | Purification of carbon dioxide |
| CA2801488C (en) * | 2010-07-02 | 2018-11-06 | Exxonmobil Upstream Research Company | Low emission triple-cycle power generation systems and methods |
| CN103452612B (en) * | 2013-08-28 | 2015-01-28 | 中国科学院工程热物理研究所 | Compressed air energy storage system using carbon dioxide as working medium |
| DE102014225063A1 (en) * | 2014-12-05 | 2016-06-09 | Siemens Aktiengesellschaft | power plant |
| CN105840255B (en) * | 2016-05-12 | 2017-07-07 | 西安热工研究院有限公司 | Generated electricity with coal-fired Brayton cycle is the electricity generation system of the integrated wind-power electricity generation of base lotus |
| CN109681279B (en) * | 2019-01-25 | 2023-10-03 | 西安热工研究院有限公司 | Supercritical carbon dioxide power generation system and method containing liquid air energy storage |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013036132A2 (en) * | 2011-12-21 | 2013-03-14 | Modi Vivendi As | An integrated system for offshore industrial activities with fume injection |
| WO2013152748A1 (en) * | 2012-04-10 | 2013-10-17 | Karl Werner Dietrich | Storing power plant |
| CN103410616A (en) * | 2013-08-22 | 2013-11-27 | 华北电力大学 | High-capacity compressed air energy storage efficient power generating system |
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