5 MW超临界二氧化碳机组锅炉闭式循环吹管工艺研究

Research on Closed Cycle Pipe Blowing Technology of 5 MW Supercritical Carbon Dioxide Unit Boiler

为探索适用于新型超临界二氧化碳锅炉的蒸气吹管工艺,以某地5MW超临界二氧化碳循环发电试验机组为研究对象,结合主辅机设备特性,提出并实践了闭式循环吹管方案。该方案借助机组原有的高、低压旁路,将锅炉系统管道首尾相接完全封闭,利用循环流动的高压二氧化碳气体连续吹扫杂质,并用滤网加以捕集。闭式循环吹管方案系统简单,操作方便,吹扫质量经打靶检验合格,有力保障了试验平台的后期试运行工作。针对方案执行初期因滤网频繁堵塞而导致机组停机次数增多的问题,现场研发并投用了具有在线切换、在线清灰功能的双路过滤器,显著提高了吹管效率,降低了吹管成本,相关经验对于推动超临界二氧化碳循环发电技术的落地产业化具有重要的工程意义。

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.