首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 68 毫秒
1.
HTR-10 氦气阀门设计要求   总被引:1,自引:0,他引:1  
核电站运行时,阀门是最易发生事故的设备之一。为了确保核电站的安全,必须选用安全可靠的阀门。10MW高温气冷实验堆(HTR-10)中的氦气阀门有十多个品种、300多台,主要为截止阀、调节阀、止回阀、安全阀等。这些阀门是高温气冷堆中面广量大的承压设备,它们连接着高温气冷堆中众多的系统,对于保证高温堆的正常稳定运行及安全停堆起着重要的作用。该文介绍了HTR-10氦气阀门的概况,氦气阀门的要求、核级氦气阀门的设计、制造、质量保证、检验和出厂试验。  相似文献   

2.
HTR-10平衡态运行方式研究   总被引:1,自引:0,他引:1  
为了使10MW高温气冷实验堆(HTR-10)运行在安全、经济的状态下,研究了5次通过、8次通过和10次通过三种运行方式下平衡态HTR-10堆芯的特性,利用高温气冷堆物理设计程序 VSOP对所选方案进行分析计算。结论表明:在最大燃耗不超过101 GWd/t的条件下,增大燃料球通过堆芯的次数并缩短每次通过堆芯所需的时间,将会使乏燃料平均燃耗提高,使HTR-10的燃料得到更有效的利用。  相似文献   

3.
氦气试验回路和热气导管性能试验装置   总被引:1,自引:0,他引:1  
高温气冷实验反应堆(HTR-10)的热气导管和它的同轴外壳,连接肩并肩分开布置的反应堆和蒸汽发生器压力容器,管内、外分别流过从堆芯底部到蒸汽发生器的高温氦气(700 ℃或950 ℃)和反向的低温氦气(250 ℃或300 ℃),它的热性能试验将在氦气试验回路上进行。描述了氦回路和热气导管试验段的技术特征。氦气试验回路由氦回路系统、冷却系统、氦净化、贮存和压力调节系统、氦中痕量杂质的取样分析系统、参数测量、数据采集与监控系统等组成。热气导管试验段具有三层套管式结构,内设氦气内加热器,试验热气导管和冷、热氦混合器,在被试热气导管内外形成700℃和250℃或950℃和300 ℃的加压氦气反向流动环境,用来研究的HTR-10热气导管的高温热性能和在运行工况下的完整性。  相似文献   

4.
清华大学核能技术设计研究院目前正在设计建造我国第一座高温气冷实验堆(HTR-10),功率为10MW。HTR-10的设计,体现了模块式高温气冷堆的先进特征,其中最主要的是固有安全特性。HTR-10的安全审评也是一个新的课题。本文阐述了HTR-10建造许可证审评中所遵循的依据和原则以及审评的主要过程和活动,讨论了审评过程中的主要安全问题,包括燃料元件、源项计算、事故分析、安全分级、包容体设计等。  相似文献   

5.
HTR-10蒸汽发生器试验回路及其水动力特性分析   总被引:1,自引:0,他引:1  
10MW高温气冷堆(HTR-10)蒸汽发生器的两相流动稳定性问题是设计中必须考虑的问题,文中分析了HTR-10蒸汽发生器恒热流和强迫循环一次热源的静态水动力特性。论述了用恒热流所得判别各类稳定性准则作为He加热的HTR-10蒸汽发生器设计依据是不足的。有必要进行He加热HTR-10蒸汽发生器工程模型两相流稳定性试验。还介绍了HTR-10蒸汽发生器工程模型试验回路及本体,以及在该试验回路上预期达到研究成果。  相似文献   

6.
10 MW高温气冷实验堆(HTR-10)蒸汽发生器是管内直流蒸汽发生器,且工作压力为 4. 0 MPa,流动不稳定性必须给予重视。本文应用频域控制理论研究 HTR-10蒸汽发生器两相流密度波不稳定性,对蒸汽发生器的传热和流动建立了数学模型,利用线性微扰原理和Laplace变换推导出闭环系统的特征方程,应用频域控制理论中的Nyquist稳定性定理判断系统的稳定性,在此基础上编制了ADIS程序,并应用此程序分析HTR-10蒸汽发生器的稳定性。结果表明,HTR-10蒸汽发生器在设计负荷下是渐近稳定的。  相似文献   

7.
HTR-10 蒸汽发生器密度波不稳定性分析   总被引:4,自引:1,他引:4  
10MW高温气冷实验堆(HTR-10)的蒸汽发生器为直流型、小盘管组件式结构,盘管弯曲半径小,工作压力为中压范围,由此而带来两相流体流动的不稳定性问题是HTR-10蒸汽发生器研究的主要问题。介绍了用Khabensky等方法分析HTR-10蒸汽发生器的密度波不稳定性。分析了入口欠热度、入口节流度、加热功率、质量流量、系统压力、热负荷及出口蒸汽干度等对HTR-10蒸汽发生器密度波脉动的影响。分析表明在HTR-10蒸汽发生器设计工况下不会发生密度波脉动。  相似文献   

8.
HTR-10初装堆芯及过渡过程物理计算分析   总被引:5,自引:0,他引:5  
选取石墨球与燃料球均匀混合作为10MW高温气冷堆(HTR-10)的初始装料方案,利用高温堆物理模拟程序VSOP及二维SN程序,分析计算了初始装料时HTR-10堆芯进水反应性效应、控制棒及第二停堆系统反应性当量,研究了初装堆向平衡态过渡过程中的临界性、单球最大功率、最大比燃耗等变化情况。结果表明:HTR-10初装堆的进水反应性效应比平衡态小;控制棒及第二停堆系统反应性当量比平衡态的大。但是,初装堆冷态下反应性控制系统当量裕量比平衡态小;过渡过程中有效增殖因数在很小范围内变化,燃料最大比燃耗不超过100GWd/t。  相似文献   

9.
高温气冷实验堆(HTR-10)堆底流道结构的作用之一是使径向温度分布不均匀的堆芯出口冷却剂得到足够的热混合。在相似模型上进行的试验研究表明,在对应HTR-10正常运行时的冷热气进口流量比为1:0.746情况下,堆底流道结构能使冷却剂的温度混合程度和均匀程度分别达94%和98.4%以上,再流过热气导管后,即到达热交换器之前,这两个值分别达到98%和99.6%。在稍作简化的模型上进行的试验表明,进口流量比对流道的热混合性能影响不大,在进口热冷流量比为0.5~2范围内所得到的温度混合程度在流量比为1时有最大值并在两侧显示出一定对称性的分布,其值在91%~95%之间。  相似文献   

10.
10MW高温气冷堆(HTR-10)的蒸汽发生器(SG)是立式、直流、螺旋管状蒸汽发生器。其工作在中压参数下,必须考虑两相流不稳定性。采用了Zuber-Findlay漂移流模型,借助于多变量频域法分析两相流密度波不稳定性。分析了一、二回路之间的反馈耦合作用,提出了多输入、输出传递矩阵的数学表达式,推导了多通道反馈系统模型。编制了程序AFIHTR,并计算出HTR-10SG中两回路耦合密度波振荡的稳定条件。  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly.  相似文献   

13.
王慧 《科技信息》2008,(10):240-240
Wuthering Heights, Emily Bronte's only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.  相似文献   

14.
The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.  相似文献   

15.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

16.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

17.
In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.  相似文献   

18.
正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-  相似文献   

19.
We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-  相似文献   

20.
正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号