Multistage centrifugal supercritical carbon dioxide compressor

Abstract

The invention discloses a multistage centrifugal supercritical carbon dioxide compressor which comprises a shell, a main shaft, an inter-shaft balance disc, a low-pressure-stage impeller, a high-pressure-stage impeller and a shaft end balance disc. The main shaft is rotatably arranged in the shell; the main shaft is provided with a high-pressure end and a low-pressure end in the axial direction; the main shaft is sleeved with the inter-shaft balance disc; the main shaft is sleeved with the low-pressure-stage impeller; the low-pressure-stage impeller is located on the side, facing a low-pressure end, of the inter-shaft balance disc; the low-pressure-stage impeller comprises a first-stage impeller body and a second-stage impeller body which are distributed in the axial direction of the mainshaft; the main shaft is sleeved with the high-pressure-stage impeller; the high-pressure-stage impeller is located on the side, facing a high-pressure end, of the inter-shaft balance disc; the second-stage impeller comprises a third-stage impeller and a fourth-stage impeller which are distributed in the axial direction of the main shaft; and the shaft end balance disc is sleeved on the main shaftand located at an air inlet of the fourth-stage impeller. The multistage centrifugal supercritical carbon dioxide compressor is high in reliability, small in leakage amount and high in pneumatic efficiency.

Description

technical field [0001] The invention relates to the technical field of supercritical carbon dioxide cycle power generation, in particular to a multistage centrifugal supercritical carbon dioxide compressor. Background technique [0002] Supercritical carbon dioxide cycle power generation is a Brayton cycle system using supercritical carbon dioxide as the working medium. The working medium enters the turbine, drives the turbine to do work, and the turbine drives the generator to generate electricity. The working medium enters the cooler to restore to its original state, and then enters the compressor to form a closed cycle. The characteristics of supercritical carbon dioxide working medium make it have good application prospects and research value. In the supercritical carbon dioxide cycle power generation system, the compressor is a very critical component. Due to the physical properties of supercritical carbon dioxide, the efficiency of the compressor has a great influence...

AI Technical Summary

Problems solved by technology

However, the existing industrial multistage centrifugal compressors have seriously affected the efficiency of the supercritical carbon dioxide cycle power generation system due to their low aerodynamic efficiency, large shaft end leakage flow and poor system stability, so they cannot meet the requirements of the supercritical carbon dioxide cycle power generation system. requirements

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