Pipeline pre-purging system and method suitable for supercritical carbon dioxide Brayton cycle

Abstract

The invention discloses a pipeline pre-purging system and method suitable for a supercritical carbon dioxide Brayton cycle. The pipeline pre-purging system comprises a CO2 storage tank arranged in a pipeline of the supercritical carbon dioxide Brayton cycle, wherein the CO2 storage tank is filled with a CO2 working medium with certain pressure; the CO2 working medium in the CO2 storage tank purges a low-temperature pipeline; and a pipeline which is not directly connected with the CO2 storage tank is arranged. A compressor in the system is used for building working medium circulation, and impurities in the pipelines are filtered through a filter and a particle collector. According to the system and the method, negative problems to a supercritical carbon dioxide Brayton cycle system caused by adopting conventional chemical cleaning and steam line blowing methods of a thermal power plant are avoided, and the purging process of a supercritical carbon dioxide Brayton cycle power generation system is simpler and more economical.

Description

technical field [0001] The invention relates to the technical field of thermal power generation, in particular to a pipeline pre-purging system and method suitable for a supercritical carbon dioxide Brayton cycle. Background technique [0002] Supercritical carbon dioxide Brayton cycle power generation technology can achieve higher thermal efficiency under the existing material level, and has many advantages such as simple and compact system, low investment, flexible operation, etc. It is a research hotspot of domestic and foreign energy companies and scientific research institutes. The supercritical carbon dioxide Brayton cycle power generation system mainly consists of compressors, turbines, regenerators and precoolers, etc., and the equipment is connected by pipelines to realize the transmission of working fluid. During the construction process of these pipelines, it is almost inevitable that welding slag and other impurities will be left in the pipelines. In a conventio...

AI Technical Summary

Problems solved by technology

In a conventional steam power generation system, there are mature chemical cleaning procedures and pipe blowing guidelines for the pipeline in the system, but for the supercritical carbon dioxide Brayton cycle, if the method in the steam power generation system is also used to clean or purge the pipeline On the one hand, it is necessary to add water pumps, water treatment systems, and steam sources, which increases the cost and complexity of the pipelines of the system; Uncertainty about running

Images