Flow Field and Blowdown Test of Secondary Side Lower Part of Steam Generator
-
摘要: 位于核电厂蒸汽发生器（SG）管板内的下部排污结构能吸出管板二次侧表面的泥渣并将其排出。为了能合理设计该排污结构并提升排污效率，本文基于非能动大型先进压水堆（CAP1400）的SG设计原型结构，按照1∶4比例设计了排污试验体，以模拟SG下部的管板、传热管等部件。通过对下部流场进行计算流体动力学（CFD）计算并与排污试验的结果进行对比，进一步掌握近管板表面区域的流体流动特征。本试验通过研究SG近管板区域流体流动特征及泥渣分布规律、测量试验体各部件压降、对比SG单边和双边排污结构的设计，为减少淤泥集结、改进设计提供依据。研究发现，单/双边排污结构排污性能基本相同，单边排污结构即可将试验体内泥渣颗粒有效排出。Abstract: The lower blowdown structure located in the tubesheet of steam generator (SG) in nuclear power plant can suck out the sludge on the tubesheet secondary side surface and discharge it. In order to reasonably design this structure and improve the blowdown efficiency, based on the SG prototype structure of passive large-scale advanced pressurized water reactor (CAP1400), a blowdown test piece was designed according to the ratio of 1:4 to simulate the tubesheet, heat transfer tube and other components at the lower part of SG. Computational fluid dynamics (CFD) calculation was carried out for the lower flow field, and the results were compared with those of the blowdown test. The fluid flow characteristics near the tube sheet surface were obtained. This test provides a basis for reducing sludge accumulation and improving the design by studying the fluid flow characteristics and sludge distribution law near SG tube plate, measuring the pressure drop of each part of the test piece and comparing the design of SG single-side and double-side blowdown structures. It is found that the performance of single/double-side blowdown structure is basically the same, and the single-side blowdown structure can effectively discharge the sludge particles in the test piece.
-
Key words:
- Steam generator (SG) /
- Lower flow field /
- Blowdown test
-
图 7 原型排污结构排污管压降随排污率的变化
Figure 7. Pressure Drop vs Blowdown Rate for Original Structure
图 9 不同循环流量单边排污结构泥渣沉积区域分布云图
Figure 9. Distribution of Sludge Deposition Area of Single-side Blowdown Structure under Different Circulating Flow Rates
图 10 不同循环流量单边排污结构管板上方速度云图
Figure 10. Velocity above Tubesheet of Single-side Blowdown Structure under Different Circulating Flow Rates
-
[1] 孙汉虹,程平东,缪鸿兴,等. 第三代核电技术AP1000[M]. 北京: 中国电力出版社,2010: 187-201. [2] 臧希年. 核电厂系统及设备[M]. 第二版. 北京: 清华大学出版社,2010: 65-79. [3] 《蒸汽发生器》编写组. 蒸汽发生器[M]. 北京: 中国原子能出版社,1982: 283-345. [4] 王福军. 计算流体动力学分析: CFD软件原理与应用[M]. 北京: 清华大学出版社,2004: 185-240. -
下载:
图(11)
计量
- 文章访问数: 89
- HTML全文浏览量: 29
- PDF下载量: 35
- 被引次数: 0
