Studies of Advanced Intermediate Heat Exchanger to replace 2^<nd> Na Loop of FBR

先进中间换热器替代FBR 2^<nd>Na回路的研究

• 批准号: 12358007
• 负责人: HORIIKE Hiroshi
• 金额: $ 24.33万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12358007/
• 关键词: advanced intermediate heat exchanger; lead-bismuth; fast breading reactor; temperature perturbation; cross correlation; 液体金属; 二次ナトリウム系; 自然対流熱伝達; ガリウム; ナトリウム; 強制対流熱伝達

The purpose of the present project was to find out appropriate materials which could be used as an intermediate heat exchange medium in the Advanced Intermediate Heat Exchanger for loop type Fast Breeder Reactor. We had initiated studies on liquid metal gallium previously and had the experimental apparatus, so the main object was to see how the lead-bismuth alloy was suitable for intermediate heat transfer fluid in comparison with liquid metal gallium.The secondary sodium loop in the FBR transfers the heat energy to the steam generator from the primary sodium to generate steam and electricity. The steam condition there of 24MPa is much higher than that in the light water reactors and sodium water reaction could not be excluded. The present study intends to introduce the third medium which does not react with water nor sodium and combine the intermediate heat exchanger(IHX) with SG to reduce the plant size too.In 2000, the experimental equipments were modified so as to use lead-bismuth … More as a working fluid instead of gallium. With this fluid change the working temperature rose very much from 100 degree C to 300C, so the third cooling loop of an organic coolant was inserted between the loops of lead-bismuth and water. The heat transfer experiment at natural convection was carried out and found that the lead-bismuth could he circulated by natural convection easer than gallium owing to larger volume expansion coefficient.In 2001, the forced convection experiment was performed with adding an electro-magnetic pump. Lead-bismuth has a problem of very instable wettability on a material surface, and this causes problems such as instable indication of the electro-magneto flow meter. Thus, new method of flow velocity measurement from cross correlation in the temperature fluctuation was developed. The heat transfer coefficient was found to be lower than that in gallium and found to agree well with the Sabottines empirical equation.In 2002, the lead-bismuth fluid was tested by the air-lift forced circulation. The air lift method was established in water circulations but scarcely no in the liquid metals. Argon gas was used to circulate the lead-bismuth as well as gallium. The air lift characteristics were studied over fluid density from onity, six and ten, and were studied in comparison. The result showed that the empirical formula agreed with the experimental results over the low flow rate region but circulation property saturated as the slip ratio approached three.As a summary; characteristics of liquid metal fluid of gallium and lead-bismuth were clarified and many knowledge were revealed. These results could contribute to the conceptual design of the demo reactor which uses heavy liquid metals as working fluid. Less

本项目的目的是寻找合适的材料，可以用作先进的中间热交换器的中间热交换介质的回路型快堆。我们之前已经开始了对液态金属镓的研究，并且有了实验装置，所以主要的目的是看看铅铋合金与液态金属镓相比，是否适合作为中间传热流体。快堆中的次级钠回路将热能从初级钠传递到蒸汽发生器，产生蒸汽和电力。24 MPa的蒸汽条件比轻水堆高得多，不能排除钠水反应。本研究拟引进不与水和钠反应的第三介质，并将中间换热器（IHX）与SG相结合，以缩小装置规模。2000年，对实验设备进行了改造，使用铅铋 ...更多信息 作为工作流体而不是镓。随着这种流体的变化，工作温度从100摄氏度上升到300摄氏度，因此在铅铋和水的循环之间插入了有机冷却剂的第三个冷却循环。进行了自然对流传热实验，发现铅铋合金由于体积膨胀系数较大，比镓合金更容易自然对流循环，2001年又进行了外加电磁泵的强制对流实验。铅-铋具有在材料表面上的润湿性非常不稳定的问题，并且这导致诸如电磁流量计的不稳定指示的问题。由此，提出了一种利用温度波动中的互相关测量流速的新方法。铅铋液的传热系数低于镓液，且与Sabottines经验公式吻合较好。2002年，铅铋液进行了气升式强制循环实验。气提法在水循环中得到了应用，但在液态金属中还没有应用。氩气用于使铅-铋以及镓循环。研究了流体密度为1、6和10时的气升特性，并进行了对比研究。结果表明，在低流量区，经验公式与实验结果吻合较好，但当滑移率接近3时，循环特性趋于饱和。这些结果可能有助于使用重液态金属作为工作流体的演示反应器的概念设计。少

项目成果

H.Horiike, K.Fujimori, T.Iitsuka, S.Inoue, S.Miyamoto 他: "Advanced Intermediate Heat Exchanger for FBR"Proceedings of 11^<th> International Conference on Nuclear Engineering. (発表予定). (2003)

H.Horiike、K.Fujimori、T.Iitsuka、S.Inoue、S.Miyamoto 等：“FBR 的高级中间热交换器”第 11 届国际核工程会议论文集（待提交）。 (2003)

H.Horiike, J.Orita: "Advanced Intermediate Heat Exchanger for FBR"Proceedings of 11^<th> International Conference on Nuclear Engineering. (CD-ROM). 36293 (2003)

H.Horiike、J.Orita：“FBR 的先进中间热交换器”第 11 届国际核工程会议论文集。

H.Horiike and J.Orita: "Advanced Intermediate Heat Exchanger for FBR"Proceedings of 11^<th> International Conference on Nuclear Engineering. (CD-ROM). 36293 (2003)

H.Horiike 和 J.Orita：“FBR 的先进中间热交换器”第 11 届国际核工程会议论文集。