涡流二极管作为一种非能动制止阀的设备,被应用于高温熔盐堆的概念设计中,本文利用FLUENT数值模拟分析了涡流二极管内正反向流动的阻力特性及其内部流场,以水、FLiBe和FLiNaK为模拟工作介质,计算了在不同工况下,涡流二极管的正反向流动...涡流二极管作为一种非能动制止阀的设备,被应用于高温熔盐堆的概念设计中,本文利用FLUENT数值模拟分析了涡流二极管内正反向流动的阻力特性及其内部流场,以水、FLiBe和FLiNaK为模拟工作介质,计算了在不同工况下,涡流二极管的正反向流动压降值、阻力系数及阻抗比,为用于钍基熔盐堆(Thorium Molten Salt Reactor,TMSR)非能动辅助冷却系统的涡流二极管设计提供参考依据。模拟计算结果表明:涡流二极管的正反向流阻随着进口雷诺数不断增大,其性能参数阻抗比ε随着雷诺数也相应增大,最后达到临界稳定值;为提高其性能参数阻抗比,对涡流二极管进行结构优化设计,并结合实验进行验证。展开更多
锂(Li)元素是液态熔盐堆中冷却剂熔盐的重要组成成分,由于^6Li相对^7Li具有较大的中子吸收截面,其在冷却剂熔盐中的摩尔含量会影响液态熔盐堆的钍铀转换性能,因此研究7Li富集度对液态熔盐堆钍铀转换性能的影响十分必要。基于熔盐快堆(Mo...锂(Li)元素是液态熔盐堆中冷却剂熔盐的重要组成成分,由于^6Li相对^7Li具有较大的中子吸收截面,其在冷却剂熔盐中的摩尔含量会影响液态熔盐堆的钍铀转换性能,因此研究7Li富集度对液态熔盐堆钍铀转换性能的影响十分必要。基于熔盐快堆(Molten Salt Fast Reactor,MSFR)的堆芯结构,分别采用FLi和FLiBe两种不同的冷却剂熔盐,选取范围在99.5%~99.995%的一系列^7Li富集度,借助熔盐堆后处理程序MSR-RS(Molten Salt Reactor Reprocessing Sequence),针对能谱、^233U初装量、钍铀转换比、^233U净产量和倍增时间、Li的演化以及氚产量等一系列参数进行分析。研究结果表明:在MSFR的堆芯中,较FLiBe而言,采用FLi作载体盐能够获得更好的钍铀转换性能;当^7Li富集度由99.995%变为99.9%时,堆芯钍铀转换比降低约1.6%,氚产量增加约8%。综合考虑燃料制造成本和钍铀转换性能等因素,对于分别采用FLi和FLiBe作载体盐的熔盐快堆MSFR,推荐的^7Li富集度都为99.9%。展开更多
为研究氟盐冷却高温堆(Fluoride-salt-cooled High temperature Reactor,FHR)非能动余热排出系统的控流装置——涡流二极管在低流速下的性能参数,建立了实验装置,测试了在水工质下由3D打印尼龙材料涡流二极管的单向特性,并由实验结果得...为研究氟盐冷却高温堆(Fluoride-salt-cooled High temperature Reactor,FHR)非能动余热排出系统的控流装置——涡流二极管在低流速下的性能参数,建立了实验装置,测试了在水工质下由3D打印尼龙材料涡流二极管的单向特性,并由实验结果得到相同结构尺寸的涡流二极管在FliBe工质下的压降值。研究结果表明,本文实验流量范围内测得的涡流二极管单向性随雷诺数的增加不断升高,最大值为23。正向流动阻力系数随雷诺数的升高不断降低,反向流动阻力系数随雷诺数的增大先增大后降低。研究结果还表明本文研究的涡流二极管结构不适用于小功率氟盐冷却高温堆非能动余热排出系统的设计。展开更多
The impregnation behavior of molten 2LiF–BeF_2(FLiBe) salt into a graphite matrix of fuel elements for a solid fuel thorium molten salt reactor(TMSR-SF) at pressures varying from 0.4 to 1.0 MPa was studied by mercury...The impregnation behavior of molten 2LiF–BeF_2(FLiBe) salt into a graphite matrix of fuel elements for a solid fuel thorium molten salt reactor(TMSR-SF) at pressures varying from 0.4 to 1.0 MPa was studied by mercury intrusion, molten salt impregnation, X-ray diffraction, and scanning electron microscopy techniques.It was found that the entrance pore diameter of the graphite matrix is less than 1.0 μm and the contact angle is about 135°. The threshold impregnation pressure was found to be around 0.6 MPa experimentally, consistent with the predicted value of 0.57 MPa by the Washburn equation. With the increase of pressure from 0.6 to 1.0 MPa, the average weight gain of the matrix increased from 3.05 to 10.48%,corresponding to an impregnation volume increase from 2.74 to 9.40%. The diffraction patterns of FLiBe are found in matrices with high impregnation pressures(0.8 MPa and1.0 MPa). The FLiBe with sizes varying from tens of nanometers to a micrometer mainly occupies the open pores in the graphite matrix. The graphite matrix could inhibit the impregnation of the molten salt in the TMSR-SF with a maximum operation pressure of less than 0.5 MPa.展开更多
文摘涡流二极管作为一种非能动制止阀的设备,被应用于高温熔盐堆的概念设计中,本文利用FLUENT数值模拟分析了涡流二极管内正反向流动的阻力特性及其内部流场,以水、FLiBe和FLiNaK为模拟工作介质,计算了在不同工况下,涡流二极管的正反向流动压降值、阻力系数及阻抗比,为用于钍基熔盐堆(Thorium Molten Salt Reactor,TMSR)非能动辅助冷却系统的涡流二极管设计提供参考依据。模拟计算结果表明:涡流二极管的正反向流阻随着进口雷诺数不断增大,其性能参数阻抗比ε随着雷诺数也相应增大,最后达到临界稳定值;为提高其性能参数阻抗比,对涡流二极管进行结构优化设计,并结合实验进行验证。
文摘锂(Li)元素是液态熔盐堆中冷却剂熔盐的重要组成成分,由于^6Li相对^7Li具有较大的中子吸收截面,其在冷却剂熔盐中的摩尔含量会影响液态熔盐堆的钍铀转换性能,因此研究7Li富集度对液态熔盐堆钍铀转换性能的影响十分必要。基于熔盐快堆(Molten Salt Fast Reactor,MSFR)的堆芯结构,分别采用FLi和FLiBe两种不同的冷却剂熔盐,选取范围在99.5%~99.995%的一系列^7Li富集度,借助熔盐堆后处理程序MSR-RS(Molten Salt Reactor Reprocessing Sequence),针对能谱、^233U初装量、钍铀转换比、^233U净产量和倍增时间、Li的演化以及氚产量等一系列参数进行分析。研究结果表明:在MSFR的堆芯中,较FLiBe而言,采用FLi作载体盐能够获得更好的钍铀转换性能;当^7Li富集度由99.995%变为99.9%时,堆芯钍铀转换比降低约1.6%,氚产量增加约8%。综合考虑燃料制造成本和钍铀转换性能等因素,对于分别采用FLi和FLiBe作载体盐的熔盐快堆MSFR,推荐的^7Li富集度都为99.9%。
文摘为研究氟盐冷却高温堆(Fluoride-salt-cooled High temperature Reactor,FHR)非能动余热排出系统的控流装置——涡流二极管在低流速下的性能参数,建立了实验装置,测试了在水工质下由3D打印尼龙材料涡流二极管的单向特性,并由实验结果得到相同结构尺寸的涡流二极管在FliBe工质下的压降值。研究结果表明,本文实验流量范围内测得的涡流二极管单向性随雷诺数的增加不断升高,最大值为23。正向流动阻力系数随雷诺数的升高不断降低,反向流动阻力系数随雷诺数的增大先增大后降低。研究结果还表明本文研究的涡流二极管结构不适用于小功率氟盐冷却高温堆非能动余热排出系统的设计。
基金supported by the Thorium Molten Salt Reactor Nuclear Energy System under the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA02030000)the Frontier Science Key Program of the Chinese Academy of Sciences(No.QYZDY-SSW-JSC016)the State Key Laboratory of Particle Detection and Electronics(No.SKLPDE-KF-201811)
文摘The impregnation behavior of molten 2LiF–BeF_2(FLiBe) salt into a graphite matrix of fuel elements for a solid fuel thorium molten salt reactor(TMSR-SF) at pressures varying from 0.4 to 1.0 MPa was studied by mercury intrusion, molten salt impregnation, X-ray diffraction, and scanning electron microscopy techniques.It was found that the entrance pore diameter of the graphite matrix is less than 1.0 μm and the contact angle is about 135°. The threshold impregnation pressure was found to be around 0.6 MPa experimentally, consistent with the predicted value of 0.57 MPa by the Washburn equation. With the increase of pressure from 0.6 to 1.0 MPa, the average weight gain of the matrix increased from 3.05 to 10.48%,corresponding to an impregnation volume increase from 2.74 to 9.40%. The diffraction patterns of FLiBe are found in matrices with high impregnation pressures(0.8 MPa and1.0 MPa). The FLiBe with sizes varying from tens of nanometers to a micrometer mainly occupies the open pores in the graphite matrix. The graphite matrix could inhibit the impregnation of the molten salt in the TMSR-SF with a maximum operation pressure of less than 0.5 MPa.
