空冷凝汽器积灰对运行调节影响的计算分析  

Computational Analysis of the Influence of Dust Accumulation on Operation and Regulation of Air-cooled Steam Condensers

作　　者：郭民臣[1] 任德斐[1] 李鹏[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,北京市昌平区102206

出　　处：《中国电机工程学报》2012年第11期60-65,146,共6页Proceedings of the CSEE

摘　　要：对直接空冷凝汽器空气侧温度实时监测能够获得各个单元进出口的温度变化情况,对直接空冷凝汽器各单元空气温升的分析可以得到凝汽器表面的积灰严重程度,了解凝汽器各区域的换热差异。凝汽器表面积灰降低了效能,同等条件下表现出空气温升减小及蒸汽侧的凝结换热量降低。研究结果表明:外部条件相同时空冷单元积灰,换热端差增大,而单元的温升减小;空冷单元的送风量需与空气的温升合理匹配,通过增加表面积灰单元凝汽器的风机转速,可以有效降低其背压以及均衡其内部凝结蒸汽量,为空冷机组运行调节提供合理有效的依据,从而达到有效节能的目的。The variations of each entrance and exit temperature can be known by realtime monitoring to the air side temperature of a direct aircooled steam condenser. The severity of dust accumulation on the surface of a condenser, and the heat transfer difference of the condenser＇s each section were obtained through the analysis on the air temperature rising of each unit. The condenser is less efficient due to the dust accumulation on its surface; at the same time, the air temperature rising is decreased and the condensation heat exchange on the steam side is reduced. The research result shows that in the same-external condition, for the dust accumulation condenser, the differences of heat exchange is increased, while the temperature rising is reduced; the unit air supply volume should be matched reasonably with the temperature rise of air. The back pressure is decreased effectively and the condensing steam flow is balanced through the increase of fan speed, which provides a reasonable and effective basis for operation and regulation of aircooled systems, and thus reaches the target of energy conservation.

关 键 词：空冷凝汽器 空冷凝汽器积灰 空冷系统运行 空气侧温升 空冷风机调节 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TK264[动力工程及工程热物理—热能工程]