 |
In the western United States, where wind power is usually greater during the night than during the day, wind turbines can produce more electricity at night than during the day, but the real problem is that electricity consumption during the night is less than during the day, and electricity is supplied and demanded over time. There is no corresponding situation. In response, U.S. researchers believe that adopting an indirect approach to building a new type of compressed air energy storage plant can store abundant wind energy in the northwestern region in preparation for the high demand for electric energy and the shortage of electric energy supply in the future.
Their proposed compressed air energy storage plant can not only store energy, but also can transform from an energy storage plant to a power plant in a matter of minutes, providing mobility during the day to balance regionally highly variable wind power generation.
The newly completed comprehensive research analysis shows that wind energy in the northwestern United States can generate air at night to drive air compressors to store air in deep underground porous rock, and when needed, can use compressed air to generate electricity and meet 85,000 users per month Demand. The technicians of the Department of Energy's Pacific Northwest National Laboratory and the Bonneville Power Authority studied through the study to find two unique energy storage methods and identified a site for the implementation of two energy storage approaches in eastern Washington State.
Steve Knudson, who is responsible for managing the study for the Bonneville Power Authority, said that since the renewable energy generation quota system (RPS) requires 20% or 30% of the electricity in the U.S. states to come from different sources (eg, Wind energy and solar energy. Therefore, the construction of compressed air energy storage plants can play an extremely valuable role in helping to manage and integrate renewable energy into the Northwest power grid.
The researchers stated that all compressed air energy storage plants operate on the same basic premise. When the supply of electrical energy is abundant, the plant takes electrical energy from the electrical grid to start large air compressors and sends the compressed air into a specific underground geological structure. When the demand for electricity is high, the compressed air stored in the ground is released and used to drive the turbine to generate electricity after heating. Studies have shown that through the above cycle, the compressed air energy storage plant uses compressed air to generate up to 80% of the electrical energy required to compress the air.
There are two compressed air energy storage plants in the world, one in Alabama, USA, and one in Germany. They use man-made salt caverns to store air (ie, excess electricity). In contrast, the methods proposed by the Pacific Northwest National Laboratory of the United States and Bonneville Power Authority are different: the use of underground porous natural rock areas to store renewable energy.
Over the past 10 years, as energy companies and other agencies are seeking ways to better integrate renewable energy into the power grid, the use of underground porous rock to store compressed air and generate electricity is gaining increasing attention. About 13% of Northwestern U.S. electricity supply, that is, nearly 8,600 megawatts is generated from wind power. The question of how to effectively use nighttime wind energy prompted the Department of Energy's Pacific Northwest National Laboratory and the Bonneville Power Authority to decide whether or not new technologies could be used. Used in the northwestern region for investigation.
In search of potential compressed air storage sites, the team examined the Columbia Plateau. There, most of the land was covered with thick volcanic basalt. The team sought a basalt structure that was 1,500 feet underground and 30 feet thick, while the site was close to the high-voltage transmission line and met other relevant conditions.
Subsequently, the researchers analyzed the data obtained from drilling natural gas exploration and research in the Hanford Field area in the southeastern part of Washington State, and input the data obtained from the drilling into a professional computer model named STOMP in the Pacific Northwest National Laboratory. in. The computer model can simulate subsurface fluid flow and allow researchers to understand how much air can be stored in different subterranean locations and ultimately how much to release back to the ground.
After analyzing the research, the researchers confirmed that there are two very promising sites in the eastern part of Washington State. One is the site known as the Columbia Hills. It is located north of Boardman, Oregon, and the Columbia River, Washington; the other The Yakiwa Minerals site is located in the Yagiwa Gorge area, 10 miles north of Shiraz, Washington.
However, the team believes the two sites are suitable for two distinctly different ways of storing compressed air. The Columbia Hills site is close to natural gas pipelines and is therefore suitable for use with conventional compressed air energy storage facilities. Such conventional equipment can use a small amount of natural gas to heat the air released from underground storage, which is then used to drive a turbine to generate electricity that generates more than twice the amount of electricity generated by a typical natural gas power plant. The researchers said that they are expected to build a conventional compressed-air energy storage power plant with a generating capacity of 207 megawatts at the Columbia Hills site.
The Yajewa mineral site is far away from the natural gas pipeline, so the research team designed different ways of storing compressed air energy, that is, using geothermal energy. The hybrid facility can use the geothermal heat deep underground to power the chillers and cool the air compressors to make them run more efficiently. In addition, geothermal energy can also be heated by compressed air released from the ground. Researchers believe that it is hopeful to build a geothermal compressed air energy storage power plant with an output of 83 MW here.
Peter McGill, a researcher and researcher at Pacific Northwest National Laboratory, said that combining geothermal energy with compressed air energy storage is a creative concept to solve the problem of Yagiwa's site engineering. This hybrid facility concept greatly expands the use of geothermal energy.
Studies have shown that both approaches can maintain energy storage over a long period of time. This will particularly help the Northwest in the use of excess energy to store compressed air when wind energy and hydropower generation exceeds the local demand in the spring. According to the researchers, the combination of a large amount of flowing snow generated by snow melting and a large amount of wind resources can enable the peak of electric energy output in the region. In order to ensure the stability of the regional power supply, the power system manager must reduce the amount of power generated or store excess power. Energy storage technologies such as compressed air storage will help places to obtain clean energy products.
The Bonaparte Power Authority, in cooperation with the Northwest Electric Power and Conservation Commission, will use the data obtained from the study to further understand the net profit that compressed air energy brings to the Northwest region. The results will be used by one or more regional energy companies to develop commercial demonstration projects for compressed air energy storage.
At present, the bottleneck and disadvantage of large scale development and manufacturing of isotropic Graphite in China still exist: the design and manufacture of large, special cold and other static presses have not kept up with it. (2) other facilities not perfect, such as the large and super large (1200 mm) Φ graphite impregnated, roasting, graphitization, purification processing, special machine tools machining must be perfect.
Fortunately, there are now cold and other static press factory to start to design and manufacture the large specification (1200mm) cold isostatic pressing machine, if the successful two years can be put into production. At the same time, the development of large scale homogenated graphite is also used in the development of vibration-forming graphite, carbon/carbon composite materials, carbon fiber and other materials used in silicon crystal production.
In the face of such a huge graphite market prospect, and graphite profound understanding to the graphite pieces processing technology progress is the precondition that the future market share, the graphite with milling, car, plane, cutting, drilling, grinding and CNC (CNC), main products including graphite, graphite mold, such as thermal field static pressure graphite, High Purity Graphite, EDM graphite, graphite crucible, graphite flake, Graphite Powder for the SPD, all kinds of graphite profiled, etc., products are now widely used in solar photovoltaic (pv), mold, electronic semiconductor, electrical discharge machining, metallurgy, chemical industry, nuclear industry and quartz, etc. We hope to cooperate with you and develop together with you in the future.
Graphite Shaped Parts,Shaped Graphite,Brushed Graphite Milk,Forged Graphite Milk
Fengcheng Ruixing Carbon Products Co., Ltd , http://www.lnfcrxts.com