Technical Design of Active Magnetic Bearings for the Helium Turbomachine of HTR-10GT

The high temperature gas-cooled reactor (HTGR) coupled with gas turbine cycle is considered as one of the leading candidates for future nuclear power plants. The gas turbine cycle will also play an important role in the six GIV nuclear reactor systems as energy conversion system. The 10MW high temperature gas-cooled test reactor coupled with gas-turbine circle (HTR-10GT) has been carried out by the Institute of Nuclear and New Energy Technology (INET) of Tsinghua University in China since year 2002. In the power convention unit (PCU) of the HTR-10GT, the contact-free and no-lubricating active magnetic bearings (AMB) are adopted to support the vertical high-speed helium turbomachine shaft, because of their numerous advantages over the conventional oil mechanical bearings under the special reactor operating conditions. Based on the previous studie, the final engineering design of helium turbomachine and the AMBs for the HTR-10GT have been finished recently. This paper firstly introduces the design principle and technical futures of the AMBs. Then the main structure, as well as the key dimensions and parameters of the different helium turbomachine and AMB components are illustrated in detail. Further more, the load capacity of AMB and the rotor dynamics of helium turbomachine draft are analysized.