en.Wedoany.com Reported - The 100MW/400MWh compressed air energy storage demonstration project in Sunite Left Banner, undertaken by Harbin Electric Boiler, has reached a key milestone. The high-temperature water spherical tank (3200m³) and low-temperature water spherical tank (2800m³), core units of the pressurized water system, have successfully passed the hydrostatic test, with the final set of test data confirmed as qualified on June 14.
Located in Mandula Town, Sunite Left Banner, Inner Mongolia Autonomous Region, this is Harbin Electric Boiler's first spherical tank project. Compressed air energy storage technology utilizes surplus electricity during off-peak grid periods to compress air, and releases the compressed air during peak load periods to drive turbines for power generation. The new compressed air energy storage technology does not rely on fossil fuels and can reduce greenhouse gas emissions during operation. Once operational, the project will enhance new energy consumption capacity, support the achievement of the "dual carbon" goals, and provide new momentum for the region's green energy transition.
The high-temperature and low-temperature water spherical tanks are core equipment for storing heat transfer media. The working principle is as follows: during the compression phase of the unit, the heat transfer medium flows from the cold tank through the heat exchanger to absorb compression heat and is then transported to the hot tank; during the power generation phase, the heat transfer medium flows from the hot tank through the heat exchanger to transfer heat to the air, and the heated air enters the expander to perform work and generate electricity. The coordinated cycle of the cold and hot tanks achieves "peak shaving and valley filling" of thermal energy.
During the construction of the spherical tanks, the project team overcame harsh environments such as severe winter cold and spring sandstorms on the grassland, as well as construction difficulties posed by the special product structure. They completed core processes including sphere assembly, precision welding, non-destructive testing, and overall heat treatment. Before the hydrostatic test, the team strictly followed national standards and specifications, making meticulous arrangements and repeated simulations for aspects such as test pressure setting and pressure holding time calculation. The high-temperature water spherical tank passed the hydrostatic test on June 8, 2026, and the low-temperature water spherical tank on June 14, 2026, achieving completion 22 days and 16 days ahead of the original schedule, respectively.
The successful hydrostatic test marks the full completion of the main construction work on the spherical tanks, and the project has officially entered the installation and commissioning phase. The project team will continue to advance the remaining supporting works, striving for the project's early completion and operation. Harbin Electric Boiler stated that it will continue to be guided by user needs and contribute to the high-quality development of the new energy storage industry.
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