Search for: steam-generators
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    Evaluation of natural circulation phenomena in WWER-1000 geometry

    , Article 2nd International Congress on Advances in Nuclear Power Plants, ICAPP 2003, Cordoba, 4 May 2003 through 7 May 2003 ; 2003 Mousavian, S. K ; D'Auria, F ; Salehi, M ; Sharif University of Technology
    American Nuclear Society  2003
    Using of natural circulation concepts in nuclear and non-nuclear industry is very important. One of important methods in new designs of "innovative" fission reactor technologies is natural circulation scene. Natural circulation is based on buoyancy force; density differences between hot and cold legs including core and steam generators, and height of hot and cold zones. In this paper we studied natural circulation phenomena in two different heights of hot and cold zones by using of RELAP5 system code. Natural circulation Flow Map (NCFM) made for both cases and compared with experimental data. We have considered main components and systems of WWER-1000 plant in our model, such as pressure... 

    Thermoeconomic approach for optimal design of gas turbine heat recovery steam generator

    , Article Proceedings of the 26th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2013 ; July , 2013 Hanafizadeh, P ; Parhizgar, T ; Ghorbanian, K ; Sharif University of Technology
    China International Conference Center for Science and Technology  2013
    In the present study a comprehensive thermoeconomic modelling of a heat recovery steam generator (HRSG) for a typical 4MW class gas turbine is performed. Usually, the thermoeconomic analyses involve a thermodynamic model of the HRSG and an economic model dedicated to assess the cost. In this study, different configurations of single and dual pressure level HRSGs are optimized and afterward compared to find the economical design. For these configurations thermodynamic model calculates the performance and the energy balance of systems at the optimal operating conditions which are derived from optimization model, and economic model estimates total cost per unit of produced energy. Finally,... 

    A non-linear controller design for the evaporator of a heat recovery steam generator

    , Article Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy ; Volume 223, Issue 5 , 2009 , Pages 535-541 ; 09576509 (ISSN) Tahami, F ; Nademi, H ; Sharif University of Technology
    This article addresses a combined approach of sliding mode control (SMC) with generalized predictive control (GPC) to achieve fluid temperature control in the evaporator of a heat recovery steam generator. The evaporator is modelled as a first-order plus dead time process. The model is developed using the experimental data obtained at an actual power plant. An output error identification algorithm is used to minimize the error between the model and the experiments in different operating conditions. A GPC method is exploited to optimize the sliding surface and the coefficients of the switching functions used in SMC. The proposed control schemes are evaluated by thorough simulation for... 

    Reliability Evaluation of Heat Recovery Steam Generator of Combined Cycle Thermal Power Plants

    , M.Sc. Thesis Sharif University of Technology Khaksar Haghani Dehkordi, Siamak (Author) ; Saeedi, Mohammad Hassan (Supervisor) ; Kazemzadeh Hannani, Siamak (Supervisor)
    Combined cycle power plants consist of three main sections, namely gas turbine, Heat Recovery Steam Generator (HRSG) and steam turbine. Occurring failure in HRSG causes the steam turbine trip, so the reliability assessment of HRSG has a great importance for forecasting the probability of occurring failure and also reducing failure causes. In this project, the reliability of HRSG considering effects of aging phenomenon, maintenance and, environmental and operational conditions on reliability is modeled. Afterward a method to estimate the model parameters is introduced. Using present method, failure data of six HRSGs of a plant each with a capacity of 50 MW is analyzed and the model parameters... 

    Developing of constructal theory concept to the total site cogeneration heat and power retrofit

    , Article International Journal of Exergy ; Volume 17, Issue 2 , 2015 , Pages 171-191 ; 17428297 (ISSN) Ghazi, M ; Amidpour, M ; Abbaspour, M ; Farzaneh, H ; Sharif University of Technology
    Inderscience Enterprises Ltd  2015
    In this paper, a novel method of retrofit design in total site cogeneration systems based on constructal theory is presented. In this regard, the total site cogeneration system is decomposed into three constructs: turbines, turbine arrays, and steam generators. The objective function to be minimised is the total annual cost of existing total site. Using constructal theory simplifies the optimisation procedure of total site in addition to reaching better conceptual design especially in more sophisticated systems. A case study from literatures has been taken up to examine the applicability of the algorithm and excellent agreement has been observed. Copyright  

    Energy and exergy analysis of internal reforming solid oxide fuel cell-gas turbine hybrid system

    , Article International Journal of Hydrogen Energy ; Volume 32, Issue 17 , December , 2007 , Pages 4591-4599 ; 03603199 (ISSN) Bavarsad, P. G ; Sharif University of Technology
    The aim of this work is to analyze methane-fed internal reforming solid oxide fuel cell-gas turbine (IRSOFC-GT) power generation system based on the first and second law of thermodynamics. Exergy analysis is used to indicate the thermodynamic losses in each unit and to assess the work potentials of the streams of matter and of heat interactions. The system consists of a prereformer, a SOFC stack, a combustor, a turbine, a fuel compressor and air compressor, recuperators and a heat recovery steam generator (HRSG). A parametric study is also performed to evaluate the effect of various parameters such as fuel flow rate, air flow rate, temperature and pressure on system performance. © 2007... 

    Development and qualification of a thermal-hydraulic nodalization for modeling station blackout accident in PSB-VVER test facility

    , Article Nuclear Engineering and Design ; Volume 303 , 2016 , Pages 109-121 ; 00295493 (ISSN) Saghafi, M ; Ghofrani, M. B ; D'Auria, F ; Sharif University of Technology
    Elsevier Ltd  2016
    This paper deals with the development of a qualified thermal-hydraulic nodalization for modeling Station Black-Out (SBO) accident in PSB-VVER Integral Test Facility (ITF). This study has been performed in the framework of a research project, aiming to develop an appropriate accident management support tool for Bushehr nuclear power plant. In this regard, a nodalization has been developed for thermal-hydraulic modeling of the PSB-VVER ITF by MELCOR integrated code. The nodalization is qualitatively and quantitatively qualified at both steady-state and transient levels. The accuracy of the MELCOR predictions is quantified in the transient level using the Fast Fourier Transform Base Method... 

    Probability Safety Assessment of Steam Generator Tube Rupture In Bushehr Nuclear Power Plant With SAPHIRE Code

    , M.Sc. Thesis Sharif University of Technology Jamshidi, Mohammad Javad (Author) ; Ghofrani, Mohammad Bagher (Supervisor)
    In the absence of appropriate control, several accidents in the nuclear power, lead to serious consequences including core melted and radiation leakage outside reactor containment. In all these events, when core melted, the reactor operation is always finished and all efforts are then directed to environmental impacts of radioactive materials to the external environment. However, the occurrence of events that would bypass reactor containment, have special significance, because all possible efforts in order to limit the leakage of radioactive materials to the external environment are ineffective. In this respect the occurrence of such incidents, as most of which is considered the worst... 

    Theoretical and Numerical Simulation of a Solar Collector for Direct Steam Generation

    , M.Sc. Thesis Sharif University of Technology Mehrabi, Pouria (Author) ; Morad, Mohammad Reza (Supervisor)
    Direct steam generation (DSG) process using linear FRESNEL collectors has been developed widely in recent years and is one of the most promising solar technologies for thermal power generation, Industrial processes and domestic usage. In this process water as heat transfer fluid (HTF) is heated through a solar field. Continuous breakthroughs are being achieved on improvement of these collectors. A multi-phase CFD model is developed to calculate the wall temperature of linear Fresnel absorber tubes and fluid properties including temperature, velocity, and pressure. In order to design the collector field and identify the critical condition such as overheating of the absorber tubes, modeling of... 

    Development of a qualified nodalization for small-break LOCA transient analysis in PSB-VVER integral test facility by RELAP5 system code

    , Article Nuclear Engineering and Design ; Volume 240, Issue 10 , October , 2010 , Pages 3309-3320 ; 00295493 (ISSN) Shahedi, S ; Jafari, J ; Boroushaki, M ; D'Auria, F ; Sharif University of Technology
    This paper deals with development and qualification of a nodalization for modeling of the PSB-VVER integral test facility (ITF) by RELAP5/MOD3.2 code and prediction of its primary and secondary systems behaviors at steady state and transient conditions. The PSB-VVER is a full-height, 1/300 volume and power scale representation of a VVER-1000 NPP. A RELAP5 nodalization has been developed for PSB-VVER modeling and a nodalization qualification process has been applied for the developed nodalization at steady state and transient levels and a qualified nodalization has been proposed for modeling of the PSB ITF. The 11% small-break loss-of-coolant-accident (SBLOCA), i.e. rupture of one of the... 

    Hydrogel materials as an emerging platform for desalination and the production of purified water

    , Article Separation and Purification Reviews ; 2020 , Pages 1-20 Salehi, A. A ; Ghannadi Maragheh, M ; Torab Mostaedi, M ; Torkaman, R ; Asadollahzadeh, M ; Sharif University of Technology
    Taylor and Francis Inc  2020
    Water is the most abundant liquid on Earth, but only 2.5% of worldwide water are fresh. It is impossible to ignore the importance of water in almost every process on Earth, from the smallest bacteria life to the formation of the continents. Today, efforts for the desalination of seawater and brackish water are critical to produce drinking water. In recent years, a novel material: hydrogel, was considered in desalination processes. Interesting hydrogel applications were proposed for forward osmosis desalination, solar still, electrodialysis, and capacitive desalination. Simple and inexpensive desalination ways for drinking water production are needed. Hydrogel compounds are one of the leading... 

    Exergoeconomic optimization of a trigeneration system for heating, cooling and power production purpose based on TRR method and using evolutionary algorithm

    , Article Applied Thermal Engineering ; Volume 36, Issue 1 , 2012 , Pages 113-125 ; 13594311 (ISSN) Ghaebi, H ; Saidi, M. H ; Ahmadi, P ; Sharif University of Technology
    In the present study, exergoeconomic optimization of a trigeneration system for cooling, heating and power purposes has been carried out. The system is made up of air compressor, combustion chamber, gas turbine, dual pressure heat recovery steam generator and absorption chiller in order to produce cooling, heating and power. The design parameters of this study are selected as: air compressor pressure ratio, gas turbine inlet temperature, pinch point temperatures in dual pressure heat recovery steam generator, pressure of steam that enters the generator of absorption chiller, process steam pressure and evaporator of the absorption chiller chilled water outlet temperature. The economic model... 

    Second law based analysis of supplementary firing effects on the Heat Recovery Steam Generator in a combined cycle power plant

    , Article ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010, 12 July 2010 through 14 July 2010, Istanbul ; Volume 1 , 2010 , Pages 201-209 ; 9780791849156 (ISBN) Karrabi, H ; Rasoulipour, S ; Sharif University of Technology
    The supplementary firing is one of the techniques which are used to increase the output power of the combined cycle power plants (CCPP). The low construction cost per generated power encourages designers to consider it in the new CCPP. In this paper the thermal and exergy analyses of HRSG for various operating conditions in variation of loads and variation of ambient temperature carried out. They are based on the performance test data at different operating conditions. The objective of these analyses is to present the effects of supplementary firing on gross power output, combined cycle efficiency and the exergy loss in Heat Recovery Steam Generator (HRSG) devices at different ambient... 

    Conceptual design and techno-economic assessment of integrated solar combined cycle system with DSG technology

    , Article Solar Energy ; Volume 84, Issue 9 , September , 2010 , Pages 1696-1705 ; 0038092X (ISSN) Nezammahalleh, H ; Farhadi, F ; Tanhaemami, M ; Sharif University of Technology
    Direct steam generation (DSG) in parabolic trough collectors causes an increase to competitiveness of solar thermal power plants (STPP) by substitution of oil with direct steam generation that results in lower investment and operating costs. In this study the integrated solar combined cycle system with DSG technology is introduced and techno-economic assessment of this plant is reported compared with two conventional cases. Three considered cases are: an integrated solar combined cycle system with DSG technology (ISCCS-DSG), a solar electric generating system (SEGS), and an integrated solar combined cycle system with HTF (heat transfer fluid) technology (ISCCS-HTF).This study shows that... 

    Thermodynamic optimization of design variables and heat exchangers layout in HRSGs for CCGT, using genetic algorithm

    , Article Applied Thermal Engineering ; Volume 29, Issue 2-3 , 2009 , Pages 290-299 ; 13594311 (ISSN) Mohagheghi, M ; Shayegan, J ; Sharif University of Technology
    The heat recovery steam generator (HRSG) is one of the few equipments that are custom made for combined cycle power plants, and any change in its design affects all performance parameters of a steam cycle directly. Thus providing an optimization tool to optimize its design parameters and the layout of its heat exchangers is of great importance. A new method is introduced for modeling a steam cycle in advanced combined cycles by organizing non-linear equations and their simultaneous solutions by use of the hybrid Newton methods in this article. Thereafter, optimal thermodynamic performance conditions for HRSGs are calculated with the help of the genetic algorithm. In the conclusion, the... 

    Adaptive critic-based neurofuzzy controller for the steam generator water level

    , Article IEEE Transactions on Nuclear Science ; Volume 55, Issue 3 , 2008 , Pages 1678-1685 ; 00189499 (ISSN) Fakhrazari, A ; Boroushaki, M ; Sharif University of Technology
    In this paper, an adaptive critic-based neurofuzzy controller is presented for water level regulation of nuclear steam generators. The problem has been of great concern for many years as the steam generator is a highly nonlinear system showing inverse response dynamics especially at low operating power levels. Fuzzy critic-based learning is a reinforcement learning method based on dynamic programming. The only information available for the critic agent is the system feedback which is interpreted as the last action the controller has performed in the previous state. The signal produced by the critic agent is used alongside the backpropagation of error algorithm to tune online conclusion parts... 

    Developing Advanced Models to Simply Simulate the HRSG of Class F Turbine in Full Scale

    , M.Sc. Thesis Sharif University of Technology Mohammad, Ali (Author) ; Darbandi, Masoud (Supervisor)
    Todays, heat recovery steam generator (HRSG) systems are used extensively in combined power plant cycles (consisting of Rankine cycles and Brighton gas cycle) to maximize their efficiencies. The role of HRSG is essential in providing additional energy needed in the steam cycle part. The HRSG has many pipes or harps. They recover the heat from the incoming gas from the gas turbine outlet, which may be boosted up by the duct burner unit. The main challenge in simulating heat recovery units such as tube bundles is to provide ultra-large and cost-efficient grids. In such situations, alternative models are used to simplify the simulation of the steam generator in full scale, including the... 

    Numerical model for estimation of corrosion location in nuclear power plant steam generators

    , Article Nuclear Engineering and Design ; Volume 241, Issue 1 , 2011 , Pages 95-100 ; 00295493 (ISSN) Tashakor, S ; Jahanfarnia, G ; Kebriaee, A ; Sharif University of Technology
    Deposition of dissolved impurities and corrosion in steam generators is a significant problem in the operation of nuclear power plants. Impurities and corrosion products usually accumulate in the secondary sides of steam generators (SG) and form deposits on the SG surfaces. A high level of impurity concentration close to the SG heating surface causes the corrosion process to occur with more intensity. The aim of this study is to estimate the most probable locations of impurity concentration and deposition in a SG. Equations representing the convection and diffusion in the liquid phase close to the heated surface (the viscous sub layer) are derived. Based on the mass balance of impurities in... 

    Solar generated steam injection in HAMCA, Venezuelan extra heavy oil reservoir; Simulation study for oil recovery performance, economical and environmental feasibilities

    , Article EUROPEC 2015, 1 June 2015 through 4 June 2015 ; 2015 , Pages 1176-1202 ; 9781510811621 (ISBN) Mirzaie Yegane, M ; Ayatollahi, S ; Bashtani, F ; Romero, C ; Sharif University of Technology
    Society of Petroleum Engineers  2015
    Application of solar energy compared to conventional gas-burning boilers for steam generation in thermal Enhanced Oil Recovery processes is a newly attended technology, which brings significant benefits to the petroleum industry through environmental and economical aspects. This technique is especially designed for the regions in which gas-burning steam generation is not viable in large scale. The objective of this study is to investigate about viability of using solar energy to generate steam instead of using conventional steam generators in a Venezuelan extra heavy oil reservoir. Limited gas production policy of the Venezuelan government is the major challenge for utilizing gas steam... 

    Comparing different scenarios for thermal enhanced oil recovery in fractured reservoirs using hybrid solar-gas steam generators, a simulation study

    , Article Society of Petroleum Engineers - SPE Europec Featured at 78th EAGE Conference and Exhibition, 30 May 2016 through 2 June 2016 ; 2016 ; 9781613994573 (ISBN) Mirzaie Yegane, M ; Bashtani, F ; Tahmasebi, A ; Ayatollahi, S ; Al Wahaibi, Y. M ; Sharif University of Technology
    Society of Petroleum Engineers  2016
    The application of the renewable energy sources, especially solar energy, for thermal enhanced oil recovery methods as an economical and environmental valuable technique has received many attractions recently. Concentrated Solar Power systems are capable of producing substantial quantities of steam by means of focused sunlight as the heat source for steam generation. This paper aims to investigate viability of using this innovative technology in fractured reservoirs to generate steam instead of using conventional steam generators. A synthetic fractured reservoir with properties similar to those of giant carbonate oil reserves in the Middle East was designed by using commercial thermal...