Recently, the National Energy Administration announced the top ten scientific and technological innovation achievements in the energy field in 2023, including an important achievement jointly developed by China Energy Construction Digital Technology Group Co., Ltd., Dongfang Electric Group Dongfang Steam Turbine Co., Ltd. and Xi'an Shaangu Power Co., Ltd. "Compressor and expander for 300 MW compressed air storage system". The selection of this achievement marks that compressed air energy storage technology, a new energy storage technology with large scale, long life and high safety, has a broader application prospect.
The key to compressed air energy storage technology is the compressor and expander, which are at the heart of the system. In this innovation, the R&D team not only successfully developed a 300 MW class "axial flow + centrifugal" compressor, but also manufactured a large-flow multi-stage and wide-load expander, representing a major technological breakthrough. These achievements have been successfully applied in compressed air energy storage power station projects in Yingcheng, Hubei Province and Feicheng, Shandong Province, and have promoted China's progress in the field of advanced compressed air energy storage technology.
Large capacity, excellent performance, let's unveil the mystery of this technology that fills the gap——
Focusing on the "stuck neck" problems such as process design, material research and development, and fast loading control strategy of high-power and large-capacity long-term energy storage air compression/expansion unit, the above three units have overcome the key technology of axial flow compressor with large-scale axial air intake, lower exhaust, and frequent start and stop under wide load conditions, and put forward the configuration scheme of axial flow + centrifugal compression of compressor units, and developed the world's first non-refueling compressed air expander equipment with the largest capacity and best performance, with a rated power of 300 megawatts, which fills the gap in China.
It is reported that the 300 MW compressed air storage project in Yingcheng, Hubei Province is a demonstration engineering practice of the 300MW compressed air storage power station carried out by the Digital Technology Group to implement the requirements of China's energy construction system to build "three new" energy construction, relying on the integrated model of "research, investment, construction and operation", and adopting the "China can build a large-capacity, high-efficiency and ultra-long-term compressed air storage system solution", creating a new route of green, zero-carbon, efficient and economical large-capacity compressed air storage.
After the completion of this project, it will drive the innovation of new energy storage technology and the research and development of key equipment technology, improve the reliability of power supply of the power grid, promote the large-scale grid-connected consumption of renewable energy, revitalize the resources of waste salt caverns, promote the rational use of underground space, promote the transformation and upgrading of regional industrial structure and the development of green and low-carbon economy, and provide "energy construction solutions" for the mainland to build a new power system and achieve the "double carbon" goal.
In this process, Shaangu Power has played an important role. As a company adhering to the mission of "creating smart green energy for human civilization", Shaangu Power focuses on becoming an expert in distributed energy system solutions in many pillar industries of the national economy. The company has built a "1+7" business model with distributed energy system solutions as the core, and provides customers with seven value-added services, including equipment, EPC, services, operations, risk-free industry value-added chain, intelligence, and finance. In this innovation, Shaangu Power's professional knowledge and technical capabilities provided important support for the R&D team to overcome technical problems.
Another team, Dongfang Steam Turbine, founded in 1966 and affiliated to China Dongfang Electric Group Co., Ltd., is a high-tech state-owned backbone enterprise that researches, designs and manufactures large-scale power generation equipment in mainland China, and is also one of the largest steam turbine manufacturing bases in mainland China.
The 300 MW compressed air storage power station project in Yingcheng, Hubei Province is not only a practical application of this achievement, but also reflects the practice of the Digital Technology Group in achieving the "three new" goals of China's energy construction. The project demonstrates a major breakthrough in large-capacity compressed air energy storage technology, which is of great significance to China's goal of carbon neutrality. This innovative project will promote the innovation of new energy storage technologies, improve the reliability of grid power supply, and promote the large-scale integration of renewable energy into the grid. At the same time, it will also promote the transformation and upgrading of the regional industrial structure and open up a new path for China's green and low-carbon economic development.