Comparison of Electrical Quantity Characteristics with or without Neural Point on Load Side of 1400MVA Nuclear Power Turbo-generator

2019 ◽  
Vol 47 (1-2) ◽  
pp. 141-152
Author(s):  
Pin Lv ◽  
Baojun Ge ◽  
Peng Lin ◽  
Hongsen Zhao
2012 ◽  
Vol 152-154 ◽  
pp. 1498-1504 ◽  
Author(s):  
Xiao Hu Zhang ◽  
Lei Hu ◽  
Jian Hua Yuan ◽  
Yi Chao Yuan

The nuclear power turbo-generator with large capacity is a basic unit of nuclear power plant, while the cooling technology becomes one of the key issues which affect its design and operation deeply. Axial-radial ventilation structure for rotor is commonly used in large nuclear power generator. In this article, according to the basic principles of computational fluid dynamics (CFD), ventilation’s structure and performance is analyzed, 3D flow model is also established. After the boundary conditions are determined, the numerical calculation and analysis is finished. And then, the rules of flow distribution is obtained, the flow field and the static pressure character of the gap is also computed, which could be very important to the ventilation system of the whole generator.


Author(s):  
Benny John ◽  
John M. Pietralik

The next stage in the Indian nuclear power programme envisions building 700 MWe Indian Pressurized Heavy Water Reactor (IPHWR) units. This development involves redesigning and up-rating of all the plant equipment including the reactor, steam generators (SGs), turbo-generator, major pumps, comparing to the current generation of the 540 MWe IPHWRs. The SG used is a vertical, inverted U-tube, natural-circulation type. The 700 MWe SG is of the same type, has the same tube bundle design and the same heat transfer area as the 540 MWe SG. In addition, the tube diameter, tube pitch, and outer diameter of the SG sections are the same as those for the 540 MWe SG. The geometry of the feedwater header, the flow restrictor in the downcomer, and the flow distribution plate are different in the two designs. The changes were required due to the 26% increase in steam flow rate while maintaining the same circulation ratio. This paper describes the design of the 700 MWe SG and a thermalhydraulic analysis of the SG using a one-dimensional, in-house code and a three-dimensional code called THIRST developed by AECL. The codes were validated for global parameters against the 540 MWe SG operating data. The analysis was made for two design versions, (1) with and (2) without integral preheater and for two versions of inlet primary water conditions, (1) with and (2) without primary steam at the entrance to the SG tubes. In addition, the effect of fouling and tube plugging on the long-term operation of the SG was considered. The paper covers the results obtained and discussion on the above-mentioned issues.


Author(s):  
Paolo Pennacchi ◽  
Andrea Vania ◽  
Steven Chatterton ◽  
Ionel Nistor ◽  
Philippe Voinis ◽  
...  

Fault identification in industrial machine is a topic of major importance under engineering point of view. In fact, the possibility to identify not only the type, but also the severity and the position of a fault occurred along a shaft-line allows quick maintenance and shorten the downtime. This is really important in the power generation industry where the units are often of several tenths of meters long and where the rotors are enclosed by heavy and pressure-sealed casings. In this paper, an industrial experimental case is presented related to the identification of the unbalance on a large size steam turbine of about 1.3 GW, belonging to a nuclear power plant. The case history is analyzed by considering the vibrations measured by the condition monitoring system of the unit. A model-based method in the frequency domain, developed by the authors, is introduced in detail and it is then used to identify the position of the fault and its severity along the shaft-line. The complete model of the unit (rotor – modeled by means of finite elements, bearings – modeled by linearized damping and stiffness coefficients and foundation – modeled by means of pedestals) is analyzed and discussed before being used for the fault identification. The assessment of the actual fault was done by inspection during a scheduled maintenance and excellent correspondence was found with the identified one by means of authors’ proposed method. Finally a complete discussion is presented about the effectiveness of the method, even in presence of a not fine tuned machine model and considering only few measuring planes for the machine vibration.


2014 ◽  
Vol 1070-1072 ◽  
pp. 361-366
Author(s):  
Chuan You Dong ◽  
Bao Jun Ge ◽  
Yan Ling Lv ◽  
Da Jun Tao

The development of China's nuclear power industry is very rapid in recent years, nuclear generator also gets great development. With the increase of generator unit capacity, The service life and reliability of the generator is improved too. Among them, transient thermal generator operation ability is one of the key factors that affects the service life and reliability of generator. This paper mainly carries on to the generator produces in asymmetric operation process of negative sequence current and transient negative sequence component analysis theory, and with a turbo generator as an example, the voltage and current in different running states of the generator and the air gap flux density were compared and analyzed with finite element method. The conclusion of this paper has reference significance to deeply research the future of generator negative sequence component.


2012 ◽  
Vol 12 (5) ◽  
Author(s):  
Nahrul Khair Alang Md Rashid

Energy is the lifeblood of development, but its amount is finite. It can neither be created nor destroyed; but it can be converted from one form to another. The conversion changes the state of the resources and the change generally is not reversible. Nuclear energy steadily contributes about sixteen percent to global total electricity demand. Its application for electricity production is expected to increase due to dwindling natural resources, concern for greenhouse gaseous emission, and the limited capability of renewable energy and biofuels to be major energy resources. Nuclear energy, however, is plagued with ever presence public perception issues, some are real some are due to misperceptions. The trio of accidents: Three Mile Island, Chernobyl, and most recently, Fukushima, however has slightly dampened the prospect. Nuclear energy makes use of uranium, an element that has no peaceful applications other than to be used in nuclear power reactors to generate heat or neutrons, produce steam, and drive turbo-generators for electricity production. Other resources, such as oil, coal, and gas have multiplicity of uses that cannot be substituted by uranium. On that premise, this paper argues that the use of nuclear energy is an ethical choice. This choice overrides considerations such as waste, complexity, and safety that are often projected as reasons for avoiding it altogether. Those considerations are of scientific and engineering dimensions that mankind has to wrestle and overcome as the khalifah. In so doing, proper education and ethical use of knowledge become imperative.   ABSTRAK: Tenaga adalah nadi pembangunan, tetapi jumlahnya terbatas. Ia tidak boleh dicipta atau dimusnahkan; tetapi ia boleh ditukar dari satu bentuk ke bentuk lain. Pertukaran bentuk ini mengubah keadaan sumber tenaga dan perubahan tersebut tidak boleh ditukarbalik. Tenaga nuklear menyumbang kira-kira enam belas peratus kepada jumlah permintaan elektrik global. Keperluan tenaga elektrik dijangka meningkat kerana pengurangan sumber asli, kebimbangan atas pelepasan gas rumah hijau, dan keupayaan biofuel dan tenaga boleh diperbaharui untuk menjadi sumber tenaga utama. Namun begitu, tenaga nuklear sentiasa dibelenggu oleh isu-isu persepsi umum, sebahagiannya benar dan sebahagian lagi disebabkan oleh salah anggap. Ketiga-tiga kemalangan nuklear: Three Mile Island, Chernobyl, dan baharu-baharu ini, Fukushima, bagaimanapun menjejaskan sedikit prospek berkenaan. Tenaga nuklear menggunakan uranium, suatu unsur yang tidak mempunyai sebarang kegunaan aman selain daripada digunakan dalam reaktor nuklear untuk menjana neutron atau haba, menghasilkan wap, dan memacu turbo-generator yang mengeluarkan elektrik. Sumber-sumber lain seperti minyak, arang batu dan gas mempunyai pelbagai kegunaan yang tidak boleh digantikan oleh uranium. Atas hujjah itu, rencana ini mengutarakan bahawa penggunaan tenaga nuklear adalah pilihan yang beretika. Pilihan ini mengatasi pertimbangan-pertimbangan seperti sisa, kerumitan teknologi, dan keselamatan yang sering ditonjolkan sebagai alasan untuk mengelakkan sama sekali kegunaan tenaga nuklear. Pertimbangan-pertimbangan tersebut adalah dalam dimensi saintifik dan kejuruteraan yang manusia, sebagai khalifah, perlu tangani dan atasi. Dalam berbuat demikian, pendidikan yang sempurna dan penggunaan pengetahuan yang beretika menjadi penting.  Keywords-nuclear energy;greenhouse gas; renewable energy;ethical energy use; nuclear fuel; uranium; nuclear reactor.


2015 ◽  
Vol 3 (24) ◽  
pp. 83-90 ◽  
Author(s):  
Paweł Sokólski ◽  
Karol Kulkowski ◽  
Anna Kobylarz ◽  
Kazimierz Duzinkiewicz ◽  
Tomasz A. Rutkowski ◽  
...  

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