摘要
在压水堆核电厂热经济性分析中,管道热效率的分析往往不被研究者所重视。首先从管道热效率的定义出发,给出了管道热效率的计算表达式,以及各种管道损失的计算方法。然后针对某些影响管道热效率的因素,同时也对蒸汽动力转换系统循环热效率产生影响的问题,分析了影响管道热效率的因素变化对蒸汽动力转换系统循环热效率和压水堆核电厂全厂热效率的影响。最后,以某990MW核电机组为例,通过计算分析了如主蒸汽管道疏水门泄漏蒸汽、厂用蒸汽、主蒸汽管道散热、蒸汽发生器排污等对管道热效率、蒸汽动力转换系统循环热效率及全厂热效率的影响。结果表明,上述因素变化均导致管道热效率降低和全厂热效率的降低,但不同因素变化对全厂热效率的影响机理却存在较大的差别。
In thermal economical analysis of PWR nuclear power plant, piping thermal efficiency was seldom paid attention by researchers. Firstly, the computing formula of piping thermal efficiency and various kinds of pipe losses were introduced in this paper based on the definition of piping thermal efficiency. Moreover, Aiming at the problem that some factors affecting piping thermal efficiency also affected steam power transition system cycle thermal efficiency and the whole plant thermal efficiency of PWR nuclear power plant, it was analyzed that the influence of the change of these factors affecting piping thermal efficiency on steam power transition system cycle thermal efficiency and the whole plant thermal efficiency of PWR nuclear power plant. Finally, taking a 990MW nuclear power plant for example, the influence of leaking steam through drain valve of main stream pipe, auxiliary steam, radiation thermal loss of main steam pipe, blowdown from steam generator and all that on piping thermal efficiency, steam power transition system cycle thermal efficiency and the whole plant thermal efficiency were analyzed by calculating. The calculating and analysis results show that all of the above-mentioned factors lead to the reduction of the piping thermal efficiency and the whole plant thermal efficiency, but the influence mechanism on the whole plant thermal efficiency is difference between these influence factors of piping thermal efficiency.
出处
《汽轮机技术》
北大核心
2012年第3期165-169,219,共6页
Turbine Technology
基金
吉林省科技发展计划项目(20080523)
关键词
二回路热力系统
蒸汽动力转换系统
管道热效率
循环热效率
全厂热效率
thermal system of secondary circuit
steam power transition system
piping thermal efficiency
cycle thermal efficiency
the whole plant thermal efficiency
