Axial flow and radial flow integrated double-rotating-speed efficient anti-surge carbon dioxide compressor structure

Abstract

The invention discloses an axial flow and radial flow integrated double-rotating-speed efficient anti-surge carbon dioxide compressor structure, which is characterized in that a low-pressure end bearing of a compressor is arranged in a machine shell, and the high-pressure end bearing of the compressor is arranged outside the machine shell; the compressor adopts an axial air inlet and radial air exhaust arrangement mode; the front stage of the compressor is a low-speed axial flow rotor and adopts axial flow type blades; the last stage of the compressor is a high-speed radial flow centrifugal rotor and adopts radial flow centrifugal blades; a gear structure is adopted between the low-speed axial flow rotor and the high-speed radial flow centrifugal rotor for speed increase, and the rotating speed ratio of the high-speed radial flow centrifugal rotor to the low-speed axial flow rotor is between 1 and 2; and a compressor motor is arranged on one side of the high-speed radial flow centrifugal rotor, adopts a high-speed permanent magnet motor and is directly connected with the compressor high-speed radial flow centrifugal rotor through a coupler. According to the invention, the low-speed axial-flow rotor and the high-speed centrifugal rotor are integrally designed, so that the compressor has the characteristics of high efficiency of an axial-flow compressor and good anti-surge performance of a centrifugal compressor at the same time.

Description

technical field [0001] The invention belongs to the technical field of supercritical carbon dioxide cycle power generation, and in particular relates to a shaft-radio-flow integrated double-speed high-efficiency anti-breathing carbon dioxide compressor structure. Background technique [0002] With the development of power generation technology in recent years, studies have shown that the generator set uses supercritical carbon dioxide instead of water vapor as the circulating working fluid, which has the advantages of high cycle efficiency, compact equipment structure, and small initial investment in infrastructure within a certain power range. The critical carbon dioxide cycle power generation system is a very promising power generation method. [0003] For the current supercritical carbon dioxide cycle power generation technology, the efficiency and stability of the carbon dioxide compressor directly determine the cycle efficiency and stability of the power generation syst...

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Problems solved by technology

[0003] For the current supercritical carbon dioxide cycle power generation technology, the efficiency and stability of the carbon dioxide compressor directly determine the cycle efficiency and stability of the power generation system, but for the two commonly used axial flow and radial flow centrifugal compressors , the former has high efficiency but poor anti-surge performance, and the latter has low efficiency but good anti-surge performance. Therefore, the present invention proposes an axial-radial flow integrated dual-speed high-efficiency anti-surge carbon dioxide compressor structure, which has the efficiency of an axial flow compressor Dual advantages of high performance and centrifugal anti-surge performance

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