Abstract: A design method for a supercritical carbon dioxide compressor includes: obtaining a performance curve of the supercritical carbon dioxide compressor based on the fluid similarity theory; performing off-design performance correction of the supercritical carbon dioxide compressor based on the performance curve; controlling a dry gas seal temperature of the supercritical carbon dioxide compressor based on a correspondence between temperature and pressure; and providing a fluid dynamic pressure gap between a high-speed shaft gear and a low-speed shaft gear in a gearbox of the supercritical carbon dioxide compressor, and adjusting a gearbox thrust through the fluid dynamic pressure gap.

Abstract: A supercritical carbon dioxide zero leakage dry gas sealing device includes a main gas flow path, a main gas flow branch, an isolation gas flow branch, a pressure reducing valve, and a temperature control assembly. One end of the main gas flow branch is in communication with the main gas flow path and the sealing cylinder. The isolation gas flow branch is in communication with the main gas flow path and the gearbox. The pressure reducing valve is arranged on the isolation gas flow branch. The temperature control assembly is configured to control the temperature of the injection gas flow based on the gas flow pressure of the injection gas flow introduced into the main gas flow path.