Text: Dazhuang Laboratory
(All content in this article has official and reliable sources, and the specific information is detailed at the end of the article)
In people's general perception, wind power has always been one of the most important power generation technologies, but with the rapid development of new energy in recent years, the shortcomings of traditional wind power affected by the environment and unstable power energy are highlighted, and if there is no electric energy, the consequences are unimaginable.
At present, our country already has the technology to use air to generate electricity, and can generate 40,000 kWh of electricity a day, so how does China's power grid use air to generate electricity?
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Air also generates electricity
Wind power generation, I believe everyone is familiar with it, this power generation technology has the advantages of pollution-free and clean, it is this advantage that makes wind power popular all over the world, but wind power is not perfect, this technology also has its defects.
For example, if the wind is weak, the windmill will not be pushed by the wind, which will cause it to stand still, so there is no way to generate electrical energy normally.
In addition, if some of the windmills do not work, then the remaining windmills are likely to be overloaded, and there will be some damage to the windmills.
Secondly, usually how much electricity is sent, how much we can consume, this kind of electricity has no way to be stored in a state of storage, even if there are some storage methods, but the high cost, it is not easy to popularize in the country, so scientists have carried out a series of studies on this topic, and finally have a breakthrough of different degrees.
Through the article published by China Energy Construction Network on August 12, 2023, we can learn that at present, our country's technology has reached a breakthrough in using air to generate electricity, so that we can store these electric energy in addition to ensuring our demand for electricity.
Then the principle of air power generation is to compress the air and store it, just like a giant power bank, so that some of the electric energy generated by the power station can be stored in good condition, and when the power supply is insufficient in the future, the electric energy will be released, so as to better improve the reliability of China's power grid.
As a new type of storage technology, compressed air energy storage technology can well cope with the power generation technology of new energy such as light and wind, and solves the disadvantages of randomness, intermittency and volatility of wind power generation, so that the disadvantages of watching the sky and eating are well solved.
Coupled with the pure green advantages of compressed air technology, it can also avoid air pollution, which is called super green power bank, and the storage containers of compressed air, we can also imagine them as batteries for compressed air systems, and are divided into ground and underground.
High-pressure storage tanks are usually used for storage on the ground, and artificial chambers and salt caverns will be used for reasonable storage underground, which have the advantages of low cost and good sealing, and give full play to the advantages of compressed air energy storage.
It is not only environmentally friendly, green, and inexhaustible, but also in terms of compressed air energy storage power stations, which are usually selected in abandoned mines and salt caverns, which can also effectively realize the reuse of resources and effectively reduce the development area and cost.
Compared with some of our conventional lithium battery energy storage, it has the advantages of being more environmentally friendly, lower cost and larger capacity, and compared with pumped storage, it also has the characteristics of short construction period and flexible site selection.
Because compressed air energy storage technology has two operating principles, divided into "refueling" and "non-refueling", refueling technology usually refers to the heat generated in the process of compressed air is not recycled, and can only be used to assist in power generation through the combustion of a large number of fossil fuels.
The non-refueling technology is the use of heat technology, using the heat generated by compressed air to assist power generation, this technology is not only efficient and environmentally friendly, but also has the advantages of zero carbon emissions and no combustion, but air power generation has not been studied in recent years.
As early as 1978, Germany took the lead in putting into a large-scale commercial operation of compressed air energy storage refueling power station, and the United States also operated a refueling power station in 1991, but the refueling power station has the defects of high pollution and low efficiency, which led scientists to carry out relevant work and research on new air compressed energy storage.
After decades of development, this technology has gradually matured, China Energy Construction continues to tackle the core technology of physical energy storage, takes the lead in the country to carry out a wide range of layout, has established a number of compressed air energy storage demonstration projects, and comprehensively promotes the development of compressed air energy storage industrialization, systematization and engineering.
How is 40,000 degrees in 1 day?
Through the article published by CCTV Finance on December 10, 2021, we can learn that in 2021, our country independently developed the first 10 MW advanced compressed air energy storage system.
And this system is quite powerful in terms of power generation, after the successful grid connection in Bijie, Guizhou, you can generate 40,000 kilowatt-hours of electricity a day, these electric energy can well guarantee the electricity consumption of 3,000 ordinary families a day, because, power experts also compare this system to a super-large power bank.
According to reports, this compressed air energy storage system is mainly divided into two links of energy storage and energy release to operate, at the beginning of the compressor to compress the air and store, and then when electricity is needed, and then through the release of high-pressure air, drive the generator, to achieve the role of power generation.
And in the workshop of the energy storage system, although it looks full of dense containers and pipes, it is no different from a chemical plant, but the working process of these systems is a physical process, without any chemical reaction, so there is no waste that needs to be discarded in this workshop, which is particularly green and environmentally friendly.
However, it sounds like this kind of system is only as simple as one pressure and one release, but it is very difficult to develop and apply, including integrated control, heat storage heat regenerators, expanders, compressors, which are important key technologies for compressed air energy storage.
In addition, it is necessary to study how to maximize the efficiency of these key technologies, and how to transform these theories into reality is a major obstacle in addition to repeated scrutiny of theories and concepts.
In addition, at the time of the construction of the compressed air energy storage system, there were tens of thousands of parts alone, and how to assemble these tens of thousands of components into an efficient system has also become a problem.
In the period that followed, the relevant staff went through a year of commissioning and installation of the system alone, and then after a number of adjustments, it took another four years to make the system reach the ideal level.
Including in the world, various countries are actively laying out energy storage projects, in order to build a more solid and reliable new power system is making unremitting efforts, China has become a leader in it, and gradually make the fantasy of air storage power this new energy storage technology become a reality.
China is already in the lead
Through the article published by the Beijing News on April 30, 2024, we can learn that after the research of the air power generation system, China is not satisfied with the present, and is still actively carrying out new compressed air energy storage research and development technology, and it has been rewarded on April 30.
With the success of the first 300 MW compressed air energy storage power station in the world, Shandong Feicheng has become the world's lowest cost, best performance, highest efficiency and largest compressed air energy storage power station after the first successful power generation.
It is understood that this power station adopts the latest technology developed by the Institute of Engineering Thermophysics of the Chinese Academy of Sciences, overcomes the multi-stage high-load turboexpander technology and multi-stage wide-load compressor technology, and breaks through the full set of core key technologies of the 300 MW compressed air energy storage system.
Creatively developed high-efficiency compact heat exchanger, multi-stage wide-load compressor, multi-stage high-load turboexpander and other core equipment, so that the system equipment autonomy rate has reached 100%, and the unit cost of the system has been reduced by more than 30% compared with 100 MW, truly realizing the situation of complete autonomy and control.
The power station realizes large-scale store energy storage through air, which has the characteristics of clean and pollution-free, long life and high efficiency, and can provide backup for the power grid, phase modulation, frequency modulation and other store control functions, which can effectively support the smooth operation of the store system.
Through the construction scale of 300 MW/1,800 MWh and the rated design efficiency of 72.1% of the system, the annual power generation alone can reach 600 million kWh, and it can be discharged for six consecutive hours, providing power security for 200,000-300,000 households, saving 189,000 tons of standard coal per year and reducing carbon dioxide emissions by 490,000 tons.
While maintaining social benefits, it has also made effective economic savings, and energy storage technology, as a key link in the development of new energy, will have more new energy storage technologies in the future, which provides strong support for China to achieve the dual carbon goal and rewrite the energy pattern.
Resources:
CCTV Finance - Magical! "Air" can also generate electricity! 1 day 40,000 degrees, how to do it December 10, 2021
Can China build - can you know|Generate electricity from air? I'm not kidding! August 12, 2023
Beijing News - The world's first 300 MW advanced compressed air energy storage power station was successfully connected to the grid for power generation, April 30, 2024
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