Air compressor system adopting supercritical carbon dioxide as working medium

Abstract

The invention discloses an air compressor system adopting supercritical carbon dioxide as a working medium. The air compressor system mainly comprises an air compressor part, a high speed starting motor part and a driving turbine part, wherein the air compressor, the high speed starting motor and the driving turbine are connected through one shaft, have the same rotation speed during operation, and are sealed inside a pressure outer shell composed of high-pressure and low-pressure boundaries; the air compressor part mainly comprises parts such as an air compressor high-pressure outer shell, an air compressor impeller and air compressor side dry gas seals; the high speed starting motor part mainly comprises parts such as an air compressor side radial bearing, a high speed motor, an axial bearing, a turbine side radial bearing, a low-pressure outer shell and a suction pump; and the driving turbine part mainly comprises parts such as a turbine high-pressure outer shell, a driving turbine impeller, tooth seals, a turbine side dry gas seal and an air injection pipe. The air compressor system provided by the invention has the characteristics that the size is small, external zero leakage is achieved, and the efficiency is high, and can be utilized as an air compressor device of a supercritical carbon dioxide power generation technology.

Description

technical field [0001] The invention relates to a turbomachinery and power equipment, in particular to a compressor system using supercritical carbon dioxide as a working medium. Background technique [0002] The current thermal power generation technology generally uses steam as the working medium and adopts the Rankine cycle principle, mainly including systems or equipment such as feed water pumps, boilers, steam turbines, and condensers. Because the steam power generation technology must utilize the phase change process of water, it has disadvantages such as low efficiency, bulky volume, and high investment cost. The Brayton cycle power generation technology using supercritical carbon dioxide as a working medium is an important direction to replace steam power generation technology and realize energy conversion with high efficiency and low cost. The supercritical carbon dioxide power generation system mainly includes compressors, heat source equipment or heat exchangers,...

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Problems solved by technology

The inlet pressure of the traditional compressor is generally normal pressure, and the physical properties of the working medium are basically constant, which is quite different from the technical characteristics of the compressor in this system

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