600 MW三排管空冷凝汽器结冻因素分析及防冻措施探讨  

Analysis on Freezing Factors of 600 MW Three-row-piped Air-cooled Condenser

作　　者：刘振盛 

机构地区：[1]宁夏大唐国际大坝发电有限责任公司,宁夏青铜峡751607

出　　处：《东北电力技术》2015年第7期41-43,共3页Northeast Electric Power Technology

摘　　要：空冷凝汽器在冬季低负荷运行时,换热管束内蒸汽热负荷与管束换热能力不匹配是导致空冷凝汽器管束发生结冻的主要原因,不凝结气体未及时抽出,在空冷凝汽器内部聚集使结冻现象加剧。本文对直接空冷凝汽器发生结冻的因素进行分析,并提出防止空冷凝汽器结冻的有效措施,主要有:设计时管束采用顺流和逆流结构相结合的方式;运行时控制冷空气流量与蒸汽流量相匹配,并提高真空系统严密性,及时抽出真空系统内不凝结气体。The main reason is that heat loads and heat transfer capability in the tube bundles do not match which lead to air cooled steam condenser freeze at low load operation of air cooled steam condenser in winter. If non-condensable gas is not removed timely, non-condensable gas does collect result in increased freeze. Antifreezing measures are adopted, tube bundles design mix with down stream structure and contraflow structure and make sure cooling air flow matches steam flow during the operation, improving the tight- ness and non-condensable gas is removed timely in vacuum system.

关 键 词：空冷凝汽器 结冻因素 防冻措施 

分 类 号：TM621[电气工程—电力系统及自动化] TQ545[化学工程—煤化学工程]