侧向抽气式窄带状凝汽器布管方案研究

发布时间：2018-10-17 08:49

【摘要】：电站凝汽器是火电厂汽轮机发电机组的重要组成部分,其工作性能的好坏对整个机组的安全性与经济性有着重大的影响。作为凝汽器中最主要的部件,冷却水管束的布置方式对整个凝汽器的传热性能有着重要的影响,对凝汽器布管方案开展研究具有重要意义。本文着重关注空冷区对凝汽器性能的影响,首先收集了3种空冷区形状的凝汽器管束,在商用软件Fluent计算平台上,对其进行了壳侧流动、传热的数值模拟,分析了它们的传热性能;然后结合分析结果,设计了一种新型管束——侧向抽气式窄带状凝汽器管束,该管束的特点在于空冷区位于凝汽器管束底部两侧,成矩形状。最后,通过与某种管束在同等条件下的比较,验证了该新型管束的优良性能。论文还开展了新型管束矩形空冷区不同长宽比的数值研究,研究工作在保持空冷区面积、蒸汽参数、冷却水参数、总管数等条件不变的情况下进行,通过对各种方案模拟结果的分析,给出了本文所设计的新型管束的矩形空冷区长宽比的取值建议。论文开展的第三部分工作是以凝汽器设计需要与循环水系统相匹配为情景设定开展的凝汽器管束系列化工作,以某600MW机组凝汽器为研究对象,在不同循环水管流速的情况下对凝汽器进行热力设计,得到不同循环水量下的热力设计结果,然后以本文所设计的新型管束为管束模块,将其布置在凝汽器壳体内,形成对应不同循环水流量的凝汽器系列化产品。
[Abstract]:The condenser of power station is an important part of steam turbine generator set in thermal power plant. The performance of condenser has a great influence on the safety and economy of the whole unit. As the most important part of the condenser, the arrangement of the cooling water tube bundle has an important influence on the heat transfer performance of the whole condenser. This paper focuses on the effect of air cooling zone on the performance of condenser. Firstly, three condenser tube bundles with different air cooling zone shapes are collected and numerically simulated on the commercial software Fluent platform for shell side flow and heat transfer. Their heat transfer performance is analyzed, and then a new type of tube bundle is designed, which is a narrow strip condenser bundle with lateral air extraction. The characteristic of the tube bundle is that the air-cooled zone is located at the bottom of the condenser tube bundle and becomes rectangular. Finally, the excellent performance of the new tube bundle is verified by comparing it with a certain tube bundle under the same conditions. The numerical study of the different aspect ratio in the rectangular air-cooled zone of a new type of tube bundle is also carried out, which is carried out under the condition of keeping the air cooling area, steam parameter, cooling water parameter and total pipe number unchanged. Based on the analysis of the simulation results of various schemes, some suggestions on the ratio of length to width of the rectangular air-cooled zone of the new tube bundle designed in this paper are given. The third part of the work is to set the condenser tube bundle with the condenser design needs matching the circulating water system as the scenario, taking the condenser of a 600MW unit as the research object. The thermodynamic design of condenser is carried out under different circulating water flow velocity, and the results of thermodynamic design under different circulating water flow are obtained. Then, the new tube bundle designed in this paper is used as the tube bundle module, and it is arranged in the condenser shell. A series of condenser products corresponding to different circulating water flows are formed.
【学位授予单位】：上海电力学院
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM621

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