Supercritical carbon dioxide Brayton cycle working fluid purification system and method

Abstract

The invention discloses a supercritical carbon dioxide Brayton cycle working fluid purification system and method. A supercritical Brayton cycle system, a first pressure regulating valve, a second pressure regulating valve and a membrane separation device are included, wherein an outlet of a main compressor in the supercritical Brayton cycle system communicates with an inlet of the membrane separation device through the first pressure regulating valve, an impurity gas outlet of the membrane separation device is divided into two paths, one path is used for discharging, the other path and a carbon dioxide outlet of the membrane separation device are combined through a pipeline to then communicate with one end of the second pressure regulating valve, and the other end of the second pressure regulating valve communicates with a heat absorption side inlet of a low temperature regenerator in the supercritical Brayton cycle system. The system and method realize continuous purification of supercritical carbon dioxide Brayton cycle working fluid.

Description

technical field [0001] The invention relates to a working medium purification system and method, in particular to a supercritical carbon dioxide Brayton cycle working medium purification system and method. Background technique [0002] Under the background of energy shortage and environmental crisis, people pay more and more attention to improving energy efficiency. Among the many thermodynamic cycles, the supercritical Brayton cycle is the most advantageous cycle form. The new supercritical working medium carbon dioxide has inherent advantages such as high energy density, high heat transfer efficiency, and simple system. It can greatly improve the conversion efficiency of heat and power, reduce the volume of equipment, and has high economic efficiency. [0003] However, there are some differences between this type of cycle and the traditional Rankine cycle. The supercritical carbon dioxide Brayton cycle uses carbon dioxide as the work instead of water. In the circulation ...

AI Technical Summary

Problems solved by technology

The supercritical carbon dioxide Brayton cycle uses carbon dioxide as the work instead of water. In the circulation system, the use of carbon dioxide is relatively large, and the purity requirements are high. Generally, industrial grade carbon dioxide is used, which requires a certain initial investment.

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