极热态启动下锅炉省煤器系统水击现象分析  

Analysis of Water Hammer in Boiler Economizer System during Extreme Hot Startup

作　　者：廖彭伟 LIAO Peng-wei(Datang Central South Electric Power Test Research Institute,Zhengzhou 450000,China)

机构地区：[1]中国大唐集团科学技术研究院有限公司中南电力试验研究院,河南郑州450000

出　　处：《山东工业技术》2023年第4期59-63,共5页Journal of Shandong Industrial Technology

摘　　要：为研究某超超临界锅炉在极热态启动过程中出现的省煤器系统水击现象,对水击前后发生的事件及关联参数变化情况进行分析,并从机理上解释了水击原因:锅炉主燃料丧失后,炉水循环泵仍继续向省煤器供高温给水,导致一级省煤器入口过冷水快速升温并饱和。在极热态启动中,汽动给水泵供过冷水速率偏高,在一级省煤器入口与饱和汽水交汇造成大量蒸汽冷凝并出现压力骤降区,区域来流方向工质流动得到加强而前进方向工质流动受阻,二者相遇后水体相互挤压产生高压,来流的动能转变为压力能,从而对管道产生巨大冲击并发出噪声。In order to study the water hammer of the economizer system during the extreme hot startup of an ultra-supercritical boiler,the events before and after the water hammer and the changes of related parameters were analyzed,and the reasons for the water hammer were explained from the mechanism.The results show that after the main fuel trip occurs,the boiler-cycling pump continues to supply high temperature feed water to economizer,which leads to the rapid heating and saturation of the supercooled water at the inlet of the primary economizer.During the subsequent extreme hot startup process,the rate of supercooled water supplied by the steam-driven feed pump is relatively high.The confluence of supercooled water and saturated water at the inlet of primary economizer will cause a large amount of steam to condense and a pressure drop zone will appear.The flow of working medium in the incoming direction of the region is strengthened and the flow of working medium in the forward direction is blocked.After the two fluids meet,the water bodies squeeze each other to generate high pressure,and the kinetic energy of the incoming flow is converted into pressure energy,which has a huge impact on the pipeline and makes noise.

关 键 词：超超临界锅炉 省煤器 水击 极热态启动 

分 类 号：TK284.7[动力工程及工程热物理—动力机械及工程]