关键词: 超临界, 二氧化碳, 锅炉吹管, 闭式循环

Abstract:

In order to explore the steam pipe blowing process suitable for new supercritical carbon dioxide boiler, taking a 5 MW supercritical carbon dioxide circulating power generation test unit as the research object, the characteristics of main and auxiliary equipment were analyzed, and a closed circulating blowing scheme was proposed and applied. With the help of the original high and low pressure bypass of the unit, the boiler pipeline system is completely closed, the circulating high-pressure carbon dioxide gas is used to continuously wash the pipe wall, and the impurity particles are captured by the filter screen. The closed circulating pipe blowing scheme has the advantages of simple system and convenient operation. The purging quality has passed the target inspection, which effectively ensures the later commissioning of the test unit. In view of the unit shutdown caused by the frequent blockage of filter screen at the initial stage of scheme implementation, a two-way filter was developed and put into use on site, which can significantly improve the pipe blowing efficiency and reduce the pipe blowing cost. Relevant experience has important engineering reference significance for the infrastructure commissioning of subsequent supercritical carbon dioxide cycle generator units.

Key words: supercritical, carbon dioxide, boiler pipe blowing, closed cycle