Bibliografías temáticas / Natural circulation boiler

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Literatura académica sobre el tema "Natural circulation boiler"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 1 de febrero de 2022

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Artículos de revistas sobre el tema "Natural circulation boiler"

Bhambare, K. S., Sushanta K. Mitra y U. N. Gaitonde. "Modeling of a Coal-Fired Natural Circulation Boiler". Journal of Energy Resources Technology 129, n.º 2 (1 de abril de 2006): 159–67. http://dx.doi.org/10.1115/1.2719209.

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Modeling of a natural circulation boiler for a coal-fired thermal power station is presented here. The boiler system is divided into seven subcomponents, and for each section, models based on conservation of mass, momentum, and energy are formulated. The pressure drop at various sections and the heat transfer coefficients are computed using empirical correlations. Solutions are obtained by using SIMULINK. The model is validated by comparing its steady state and dynamic responses with the actual plant data. Open loop responses of the model to the step changes in the operating parameters, such as pressure, temperature, steam flow, feed water flow, are also analyzed. The present model can be used for the development and design of effective boiler control systems.

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Pleshanov, Konstantin, Ekaterina Khlyst, Mikhail Zaichenko y Kirill Sterkhov. "Design of a natural circulation circuit for 85 MW steam boiler". Thermal Science 21, n.º 3 (2017): 1503–13. http://dx.doi.org/10.2298/tsci161005320p.

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The paper describes research and design of fluidized bed steam boiler natural circulation circuit. The capacity of the drum boiler is 85 MW, superheated steam pressure is 98 bar. There are two variants research results of the designed circulation circuit. The first circulation circuit variant was designed as a complex circuit with a common downcomers and risers for the boiler evaporating screen. In the second variant the flow is separately supplied to and discharged from the evaporator that is divided into independent sections. We have researched and described the influence of heat absorption inequality on the furnace evaporation pads using the Boiler Designer software. We also have calculated main characteristics of the two-phase flow in the evaporation pads and evaluated reliability of the natural circulation. The circulation circuit is optimized from point of view of reliability and metal expenses. Results demonstrate that the specific quantity of metal of complex and simple circuit variants is approximately the same with equal reliability.

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Li, Bin, Tingkuan Chen y Dong Yang. "DBSSP––A computer program for simulation of controlled circulation boiler and natural circulation boiler start up behavior". Energy Conversion and Management 46, n.º 4 (marzo de 2005): 533–49. http://dx.doi.org/10.1016/j.enconman.2004.04.010.

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YAMAUCHI, Shoji, Tohru SAWAI y Shigeyasu NAKANISHI. "Analysis of the Flow Reversal in Natural-Circulation Boiler". JAPANESE JOURNAL OF MULTIPHASE FLOW 3, n.º 2 (1989): 120–30. http://dx.doi.org/10.3811/jjmf.3.120.

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Elgandelwar, Atul M., Radhe S. Jha y Mandar M. Lele. "Steady State Two-Phase Flow Analysis of Natural Circulation in Hybrid Boiler". International Journal of Heat and Technology 38, n.º 4 (31 de diciembre de 2020): 941–48. http://dx.doi.org/10.18280/ijht.380421.

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In this present works, a generalized approach for the two-phase flow analysis of a natural circulation in hybrid boiler. The model uses the combination of node and loop equations and the Newton Raphson technique for the solution of the set of equations. Loop equations have been developed for each evaporator tube with the unique driving force and pressure drop of the concerned loop. Node equations are mainly developed for common risers and downcomers. A unique connectivity matrix has been used to correlate each branch flow with loop and node equations. The model is validated by a unique indirect method by comparing the actual water level and calculated water level. Experiments have been performed with uniform diameter of tubes in 53 channels circulating loop to find the volume of steam. The model shows good agreement with experimental investigations with a maximum of 3.57% absolute error. The model can be used for the design, analysis, and optimization of the natural circulation network.

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Dzierwa, Piotr. "New start-up curves for a 200 MW steam boiler with natural circulation". MATEC Web of Conferences 240 (2018): 05007. http://dx.doi.org/10.1051/matecconf/201824005007.

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The paper shows the method of determining the start-up curves of a steam boiler, which enables its faster start-up. Faster temperature changes cause thermal stress, especially in thick-walled boiler elements. Critical elements that limit the rate of change of working fluid units include drums, outlet chamber, injection chamber, fresh steam superheater of steam coolers, tees and valve casings, rotor and turbine casing. The walls of these elements have the thickest walls due to the high pressure values occurring in them during operation. Allowable changes in temperature and pressure during start-up and shut-down can be determined by the European Standard EN 12952-3. The article shows how the start-up curves of a steam boiler can be determined using the European Standard and the method proposed by the author. Calculation results show that the starting time of the analyzed block can be significantly shortened.

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Grądziel, Slawomir y Karol Majewski. "Calculations of the pressure drop in the natural circulation boiler evaporator". MATEC Web of Conferences 240 (2018): 05009. http://dx.doi.org/10.1051/matecconf/201824005009.

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The paper presents different models used to determine pressure losses in two-phase flows: the homogeneous model, the Lockhart-Martinelli, the Friedel and the Chisholm phase-slip models and the Martinelli-Nelson graphical method. The pressure losses are calculated for the evaporator of an OP-210 boiler with the output of 210×103 kg/h operating in one of the Polish power plants. The results obtained by means of the presented models are compared to each other.

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Walter, Heimo y Wladimir Linzer. "Investigation of the stability of a natural circulation two-pass boiler". Heat and Mass Transfer 42, n.º 6 (13 de mayo de 2005): 562–68. http://dx.doi.org/10.1007/s00231-005-0652-7.

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Grądziel, Sławomir. "Analysis of thermal and flow phenomena in natural circulation boiler evaporator". Energy 172 (abril de 2019): 881–91. http://dx.doi.org/10.1016/j.energy.2019.02.003.

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Elgandelwar, Atul M., R. S. Jha y Mandar M. Lele. "Study of circulation ratio for natural circulation in water-tube boiler at different operating conditions." Journal of Physics: Conference Series 1473 (febrero de 2020): 012026. http://dx.doi.org/10.1088/1742-6596/1473/1/012026.

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Tesis sobre el tema "Natural circulation boiler"

Renfus, Jaromír. "Vysoce efektivní kondenzační kotel na zemní plyn". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229278.

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The dissertation is concerned with a problem of condensing boilers. The attention will apply to the condensing boiler which is filled in an absortion springle for a better an-nealing of exhaust gas. On this account the dissertation is possible to divide by some parts. There is a generally resolution of a condensing boiler´s principle and an effective annealing of exhaust gas for low temperatures in the first part. A description of an ab-sorption circulation follows in the second part. A practical part solves a suggestion of the condensing boiler with an absorption afterheat removal springle, an assesment of working parameters and a calculation of heat transfer surfaces. A technoeconomic ana-lysis of a proposed arrangement is made in the final part.

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Král, Ondřej. "Návrh roštového kotle s přirozenou cirkulací na spalování kontaminovaného dřeva". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-319277.

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The master´s thesis deals with steam boiler design that burns contaminated wood with output 55 tons of steam per hour, steam pressure 4,2 MPa and temperature 423 °C. First two chapters focuses on stoichiometry and calculation of heat losses and boiler efficiency. Great part of thesis constitutes of thermal and dimensional calculations of every heat transfer surface. Some specific boiler parts are described considering special fuel properties. Final chapters contain pressure losses calculation of flue gas and heated medium for pumps and fans design. Drawing is also part of the work which is included as an attachment.

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Leung, Ricky. "Dynamic simulation of an utility boiler's natural-circulation circuit". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq22625.pdf.

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Wu, Chu-Sheng y 吳巨聖. "The Study of Boiler Natural-Circulation Loop Analysis and System Control". Thesis, 1994. http://ndltd.ncl.edu.tw/handle/86375904523246848190.

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碩士
國立海洋大學
航海技術學系
82
Boilers and steam generators are widely used in business and industry sections to supply heat, power or electric energy. In recent years, the conventional boiler systems are pushed by the investigations of new necessary, such as new industry technology and environment's protection. It is now necessary to making boiler and boiler systems have a whole new situation. This study focuses in boiler's natural-circulation loop analysis. After analyzing the characteristics of natural- circulation loop, I think it is available to make boiler's design with a viewpoint of natural-circulation loop analysis. For the more, the questions of environment's protection andenergy crisis can be solved with hte boiler system control and new industry technology (such as power electronics, ....etc.) to improve the energy efficiency of boiler systems and get hteaims of energy-saving.

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洪瑞祺. "The Analysis of the Efficiency for Natural Circulation Boiler of A Power Plant". Thesis, 1999. http://ndltd.ncl.edu.tw/handle/48108178563417963677.

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碩士
國立臺灣科技大學
機械工程系
87
This study establishes a computer program model to calculate the efficiency of natural circulation boiler. The heat loss method based on higher heating value is used, by input actual values or theoretical assumed values, to get the efficiency of boiler correctly and rapidly. Using the computer program model, we discuss the influences of various factors of loss and the methods for boiler efficiency improvement.From the results, it is found that the efficiency of boiler can be improved by ways of appropriate reducing the excess air, reducing the gas temperature of outlet, raising the air temperature of inlet, and decreasing the leakage of air preheater, and so on.

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Capítulos de libros sobre el tema "Natural circulation boiler"

Yu, Hongling, Zhujing Cheng, Guojun Li, Jianming Hui, Weidong GE y Ruiyang Li. "Research on Thermal Characteristics in Natural Circulation Coke Drying Quenching Boiler". En Challenges of Power Engineering and Environment, 237–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-76694-0_43.

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Li, Ruiyang, Haisu Huang, Hongling Yu, Runge Wang, Jianming Hui y Qiuhong Geng. "Application of Horizontal Natural-Circulation Evaporator in High Pressure CDQ Waste-Heat Boiler". En Challenges of Power Engineering and Environment, 480–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-76694-0_88.

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Actas de conferencias sobre el tema "Natural circulation boiler"

Cao, Haitao y Sanxing Cao. "Integrated Natural Circulation Boiler Control System Based on PCS 7". En 2015 7th International Conference on Intelligent Human-Machine Systems and Cybernetics (IHMSC). IEEE, 2015. http://dx.doi.org/10.1109/ihmsc.2015.47.

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Huasheng, Wang y Gu Bo. "The data analysis on superheated steam control of natural circulation boiler". En 2011 International Conference on Mechatronic Science, Electric Engineering and Computer (MEC). IEEE, 2011. http://dx.doi.org/10.1109/mec.2011.6025559.

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Walter, Heimo y Wladimir Linzer. "Investigations to the stability of a natural circulation two-pass boiler". En Thermal Sciences 2004. Proceedings of the ASME - ZSIS International Thermal Science Seminar II. Connecticut: Begellhouse, 2004. http://dx.doi.org/10.1615/ichmt.2004.intthermscisemin.550.

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Walter, Heimo y Wladimir Linzer. "Flow Reversal in a Horizontal Type Natural Circulation Heat Recovery Steam Generator". En ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90689.

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Natural circulation heat recovery steam generators (HRSG) are used in many applications for the thermal recycling of the waste flue gas. Many of these boilers are designed as a horizontal type HRSG (see fig. 1). The evaporator of such a steam generator is characterized by an array of parallel tubes with different heat input. The paper presents the results of a theoretical stability analysis for a HRSG with a vertical tube bank. For the horizontal type HRSG the static instability, namely the reverse flow was analysed. The study was done at low system pressures and under hot start-up conditions for the boiler. The investigations show the influence of the geometry, the system pressure and the heat absorption of the individual tubes in the evaporator on the stability of the boiler. The aim of the study was to find design criteria to avoid reverse flow in the tubes of the evaporator. Addition of flow resistance at certain locations of the evaporator can improve the stability. A higher stability will be also achieved by the homogenization of the heat absorption in the individual layers of the bundle heating surface.

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Zhang, Tianyu, Zhenning Zhao, Yuanyuan Li y Xianran Zhu. "The simulation of start-up of natural circulation boiler based on the Astrom-Bell model". En MATHEMATICAL SCIENCES AND ITS APPLICATIONS. Author(s), 2017. http://dx.doi.org/10.1063/1.4971940.

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Debeljkovic, D. Lj y A. Sicovic. "Pressure Dynamics of One Oil-Fired Drum Type Natural Circulation Steam Generating Unit". En 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/icone14-89800.

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A mathematical model for a water level and pressure dynamics in the drum–riser–downcomer loop of natural circulation drum–type boiler is presented. The 11 [MW] oil-fired steam generation unit with natural circulation is considered. The model is based on the basis of fundamental conservation laws of mass, momentum and energy, together with very well known constitutive equations. The dynamic behaviour of each section is described in the mathematical terms and in the form of lumped parameter systems equations. The equations are linearized and manipulated into the state space form suitable for PC computer. Simulation results are shown compared with those in the literature in which an empirical model for two phase dynamics are employed. The presented model shows a reasonable prediction of water level and pressure dynamics for sudden changes in steam demand and other disturbances.

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Zhu, Zaixing, Jiemin Zhou, Ying Wang, Ping Zhou y Aichun Ma. "Numerical Simulation on Fluid Flow and Combustion in a Subcritical Pressure Boiler With Various Hybrid Coal". En ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68927.

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With a 300t/h Hg1025/18.2-YM13 sub-critical natural circulation tangentially corner-fired boiler serving as a prototype, a realizable k–ε turbulent mathematical model was established. This model used computational fluid dynamics software FLUENT6.2 and unstructured mesh generating technique of Gambit to reduce numerical false diffusion of the computational results. The fluid flow, heat transfer and combustion processes in the boiler were investigated numerically with different types of coal. The simulation data was compared and analyzed. The influences of primary air ratio, excess air ratio, pulverized fuel feeder on the combustion processes have been studied. These results could be of great help in the operation of tangentially fired furnace of pulverized coal boilers.

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Walter, Heimo y Wladimir Linzer. "Density Wave Oscillation in a Vertical Type Natural Circulation Heat Recovery Steam Generator: A Numerical Study". En ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50035.

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The dynamic flow instability, namely density wave oscillation (DWO), was investigated theoretically. The analysis was done for different design configurations of the evaporator of a vertical type natural circulation heat recovery steam generator (HRSG) at low operation pressure under hot start-up conditions. The study was done for co-current and counter flow designs of the HRSG evaporator, different drum heights and different heat flux distributions over the heating surface of the evaporator. The investigations for the HRSG show that the heat flux distribution to the evaporator tubes has an important influence on the flow stability. The simulation results indicate that a lower amplitude of the mass flow oscillation of the working medium is given by a more uniform heat flux to the single tubes of the evaporator. This leads the two-phase flow system to a more stable condition. This study has also shown that changes in the drum height of the boiler have no significant influence on the oscillation amplitude of the DWO. The simulation results have shown that the counter flow design is much more stable under the investigated conditions compared to the co-current design.

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Pe´rilleux, Mark y Dirk Eeraerts. "Retrofit of WtE Boiler: Case Study on Bonn Plant". En 10th Annual North American Waste-to-Energy Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/nawtec10-1002.

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The implementation of the European-directive requiring a residence time of at least two seconds at a temperature above 850°C (1562°F), the change in waste characteristics, and the pursuit of higher thermal efficiencies has pushed many of the existing WtE plants in Europe to their operational limits. Most existing WtE plants were not designed to operate under these conditions and may require modifications to the combustion system. Within the SEGHERS better technology (SEGHERS) company, the SEGHERS-IBB-Prism was developed to deal with the cause of these problems, which are essentially related to insufficient mixing and burnout of the flue gases in the combustion area. In the Boiler Prism the flue gas flow is divided into two parallel flows prior to entering the first radiant pass of the boiler. This division is achieved by means of a prism shaped construction, which is water-cooled and integrated with the natural circulation system of the boiler. Additional secondary air injection nozzles are fitted in the prism. This technology results in a more uniform flue gas temperature and a complete combustion of the flue gas immediately above the prism. In the Bonn Plant, these improvements in the combustion process resulted in a decrease of the fireside cleaning requirements of more than 50%.

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Gauntt, Randall O., Kyle Ross y Kenneth Wagner. "MELCOR 1.8.5 Simulation of TMI-2 Phase 2 With an Enhanced 2-Dimensional In-Vessel Natural Circulation Model". En 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22321.

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Phase 2 of the TMI-2 accident (core uncovery and melting) is revisited with the latest release of MELCOR (i.e., Version 1.8.5). An enhanced multi-ring multi-level hydro nodalization of the reactor core and upper plenum was developed to permit calculation of natural convection heat transfer between the core and upper internals. Uncertainties in boundary and initial conditions are investigated with particular attention given to the distribution of liquid in the RCS at the beginning of Phase 2 and to the histories of pressure and level in the steam generators. Special attention given to modeling the boiler sides of the once-through steam generators is presented. The modeling is designed to capture the rapid condensation of RCS vapor that would result from spraying cold auxiliary feedwater directly onto the upper portion of a voided steam generator tube bundle. Presentation of key Phase-2 accident signatures including fuel temperatures and hydrogen generation are presented. Comparisons are made between MELCOR calculations, TMI-2 data, and SCDAP/RELAP simulations. A largely improved MELCOR simulation of TMI-2 Phase 2 is obtained.

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