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Journal articles on the topic 'Bypass system of steam turbine'

Author: Grafiati

Published: 28 June 2021

Last updated: 1 February 2022

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1

Sun, W., and Y. Wang. "Selection of steam turbine bypass system." IOP Conference Series: Earth and Environmental Science 354 (October 25, 2019): 012066. http://dx.doi.org/10.1088/1755-1315/354/1/012066.

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2

Kals, W. "Condensing the Dumped Steam During a Turbine Bypass." Journal of Engineering for Gas Turbines and Power 114, no. 4 (October 1, 1992): 621–31. http://dx.doi.org/10.1115/1.2906635.

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The reaction of water-cooled and wet-surface air-cooled condensers to a bypass of the steam turbine is analyzed by the introduction of an indicant. Gas dynamics considerations for designing the breakdown of the steam pressure are included. SI metric units are compared with gravitational metric units in order to clarify the fundamental difference between these two systems of measure. Conditioning the steam before admission to the condenser involves desuperheating, which is analyzed on the basis of a heat balance.

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3

Pugi, Luca, Emanuele Galardi, Carlo Carcasci, and Nicola Lucchesi. "Hardware-in-the-loop testing of bypass valve actuation system: Design and validation of a simplified real time model." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 231, no. 2 (August 3, 2016): 212–35. http://dx.doi.org/10.1177/0954408915589513.

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During the start-up and shut-down phases of steam power plants many components are subjected to pressure and temperature transients that have to be carefully regulated both for safety and reliability reasons. For this reason, there is a growing interest in the optimization of turbine bypass controllers and actuators which are mainly used to regulate the plant during this kind of operations. In this work, a numerically efficient model for real-time simulation of a steam plant is presented. In particular, a modular Simulink™ library of components such as valves, turbines, and heaters has been developed. In this way, it is possible to easily assemble and customize models able to simulate different plants and operating scenarios. The code, which is implemented for a fixed, discrete step solver, can be easily compiled for a RT target (such as a Texas Instrument DSP) in order to be executed in real time on a low-cost industrial hardware. The proposed model has been used for quite innovative applications such as the development of a hardware-in-the-loop test rig of turbine bypass controllers and valve positioners. Preliminary experimental activities and results of the proposed test rig developed for Velan ABV are introduced and discussed.

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4

Amano, R. S., and G. R. Draxler. "High-Pressure Steam Flow in Turbine Bypass Valve System Part 1: Valve Flow." Journal of Propulsion and Power 18, no. 3 (May 2002): 555–60. http://dx.doi.org/10.2514/2.5996.

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5

Amano, R. S., G. R. Draxler, and J. M. Golembiewski. "High-Pressure Steam Flow in Turbine Bypass Valve System Part 2: Pipe Flow." Journal of Propulsion and Power 18, no. 3 (May 2002): 561–71. http://dx.doi.org/10.2514/2.5997.

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6

Arakelyan, Edik, Alexander Andryushin, Fedor Pashchenko, Sergey Mezin, Konstantin Andryushin, and Anatoly Kosoy. "Increasing the reliability and manoeuvrability of the CCGT when operating in the variable part of the power consumption schedules by switching the CCGT steam turbine to the motor mode." E3S Web of Conferences 216 (2020): 01089. http://dx.doi.org/10.1051/e3sconf/202021601089.

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The report is devoted to the problem of increasing the reliability and manoeuvrability of the CCGT when it operates in power control modes of the power system. The generalized results of research on improving the reliability and expanding the adjustment range of the PGU-450 based on the use of bypass steam distribution, reducing the duration of start-up operations and increasing the loading speed of the steam turbine and CCGT in general in the modes of CCGT power reserve during the night load gap by transferring the CCGT steam turbine to the motor mode when the CCGT operates in the condensation mode or in the heating mode according to the GTU-CHP scheme are presented. Additional advantages of the motor mode are noted: improved reliability of the steam turbine due to the elimination of cyclic temperature fluctuations of its steam inlet valves and vibrations in the last stages of the low-pressure cylinder and the possibility of operating the steam turbine generator in the synchronous compensator mode.

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7

Jelínek, Tomáš, Petr Straka, and Milan Kladrubský. "Aerodynamic Characteristics of Steam Turbine Prismatic Blade Section." Applied Mechanics and Materials 821 (January 2016): 48–56. http://dx.doi.org/10.4028/www.scientific.net/amm.821.48.

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For the needs of high-performance steam turbines producer the data of a blade section measurement have been analyzed in detail using an experimental and numerical approach. The blade section is used on prismatic blades in high and medium pressure steam turbine parts. The linear blade cascade was tested at four pitch/chord ratios at two different stagger angles. The blade cascade was tested under two levels of Reynolds number in the range of output izentropic Mach numbers from 0.4 to 0.9.The inlet of the test section was measured pitch-wise by five-hole probe to determine the inlet flow angle. The free stream turbulence of inlet flow was determined at 2.5% what is very close to the operating conditions on first high pressure stages. Two-dimensional flow field at the center of the blades was traversed pitch-wise downstream the cascade by means of a five-hole needle pressure probe to find out the overall integral characteristics. The blade loading was measured throughout surface pressure taps at the blade center. An in-house code based on a system of Favre-averaged Navier-Stokes equation closed by non-linear two-equation EARSM k-ω turbulence model was adopted for the predictions. The code utilizes an algebraic model of bypass transition valid for both attached and separated flows taking into account the effect of free-stream turbulence and pressure gradient. Results are presented by integral characteristic in means of kinetic energy loss coefficient and velocity or pressure distribution in the blade wakes or on the blade surface. In this article, the effect of investigated criteria and comparison of experimental and numerical approach are presented and discussed.

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8

Lunghi, P., and S. Ubertini. "Efficiency Upgrading of an Ambient Pressure Molten Carbonate Fuel Cell Plant Through the Introduction of an Indirect Heated Gas Turbine." Journal of Engineering for Gas Turbines and Power 124, no. 4 (September 24, 2002): 858–66. http://dx.doi.org/10.1115/1.1492839.

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The efficient end environmentally friendly production of electricity is undoubtedly one of the 21st century priorities. Since renewable sources will be able to guarantee only a share of the future demand, the present research activity must focus on innovative energy devices and improved conversion systems and cycles. Great expectations are reserved to fuel cell systems. The direct conversion from chemical to electrical energy eliminates environmental problems connected with combustion and bypass the stringent efficiency limit due to Carnot’s principle. Still in infancy, high-temperature fuel cells present the further advantage of feasible cycle integration with steam or gas turbines. In this paper, a molten carbonate fuel cell plant is simulated in a cycle for power generation. The introduction of an external combustion gas turbine is evaluated with the aim of efficiency and net power output increase. The results show that the proposed cycle can be conveniently used as a source of power generation. As compared to internal combustion gas turbine hybrid cycles found in the literature the plant is characterized by fuel cell greater simplicity, due to the absence of pressurization, and gas turbine increased complexity, due to the presence of the heat exchange system.

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9

Kang, Soo Young, Jeong Ho Kim, and Tong Seop Kim. "Influence of steam injection and hot gas bypass on the performance and operation of a combined heat and power system using a recuperative cycle gas turbine." Journal of Mechanical Science and Technology 27, no. 8 (August 2013): 2547–55. http://dx.doi.org/10.1007/s12206-013-0639-0.

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10

Ikeda, Kazutaka, Hideo Nomoto, Koichi Kitaguchi, Shinya Fujitsuka, and Takashi Sasaki. "F205 Development of Advanced-Ultra Super Critical Steam Turbine System(Steam Turbine-2)." Proceedings of the International Conference on Power Engineering (ICOPE) 2009.2 (2009): _2–463_—_2–468_. http://dx.doi.org/10.1299/jsmeicope.2009.2._2-463_.

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11

Dulau, Mircea, and Dorin Bica. "Simulation of Speed Steam Turbine Control System." Procedia Technology 12 (2014): 716–22. http://dx.doi.org/10.1016/j.protcy.2013.12.554.

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12

Raina, Faisal Mushtaq, and Gagan Deep Yadav. "Frequency Regulation in Wind Turbine and Steam Turbine based Power System." International Journal of Trend in Scientific Research and Development Volume-1, Issue-6 (October 31, 2017): 197–205. http://dx.doi.org/10.31142/ijtsrd2412.

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13

Mrzljak, Vedran, Jasna Prpić-Oršić, and Igro Poljak. "Energy Power Losses and Efficiency of Low Power Steam Turbine for the Main Feed Water Pump Drive in the Marine Steam Propulsion System." Journal of Maritime & Transportation Science 54, no. 1 (June 2018): 37–51. http://dx.doi.org/10.18048/2018.54.03.

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Steam turbine for the main feed water pump (MFP) drive is a low power turbine, for which energy power losses and energy efficiency analysis are presented in this paper. The MFP steam turbine analysis has been performed within a wide range of turbine loads. The influence of steam specific entropy increment of the real (polytropic) steam expansion upon the MFP turbine energy power losses and energy efficiency has been investigated. During all the observed loads MFP steam turbine energy power losses were in the range between 346.2 kW and 411.4 kW. The MFP steam turbine energy power losses and energy efficiency were most significantly influenced by the steam specific entropy increment. Change in the steam specific entropy increment is directly proportional to the change in MFP turbine energy power losses, while the change in the steam specific entropy increment is reversely proportional to the MFP turbine energy efficiency change. For the observed turbine loads, the MFP steam turbine energy efficiency was in the range between 46.83% and 51.01%.

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14

Sun, Yue Tai, Xiao Zhi Qiu, Yu Zhen Chen, and Bao Hua Huang. "The Impact Analysis of Regenerative System in Turbine Modeling." Advanced Materials Research 860-863 (December 2013): 1782–86. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.1782.

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The simulation of the reheat condensing steam turbine model that BPA and integrated power system stability calculation procedure given, has a large deviation with the actual experimental data. This model does not consider the regenerative steam extraction module, thus ignoring the storage effect of the regenerative steam extraction module. By analyzing the principles of reheat condensing steam turbines thermal process, based on the real turbine structure, establish multi-stage regenerative steam extraction model. Through dynamic simulation of the model was analyzed and compared with the actual data showed good results. Improved model is more realistic, more suitable for grid stability calculations.

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15

Yu, Xin Wei, Hai Ping Chen, Guang Wu Lu, Pei Gao, and Yang Yu. "Study on Application of Steam Ejector Heat Pump in Partial Innovation of Power Plant Thermal Regenerative System." Advanced Materials Research 753-755 (August 2013): 2761–65. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.2761.

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The exhaust steam heat of steam driven feed pump small steam turbine is considerable in modern coal-fired power generating unit, most of which is adopted the way of wet cooling through the condenser as same as main steam turbine for condensing steam turbine unit, all the waste heat with it is taken away by circulating cooling water and not used effectively. This paper will propose the way of part of exhausted steam of small steam turbine recycled to the regenerative extraction steam system to heat condensate based on steam ejector heat pump, so as to use the exhausted steam effectively and analyze the thermal economic index of different schemes by using equivalent enthalpy drop method. The results show that it produces best economic benefits when exit steam of steam ejector heat pump is recycled to steam extraction of the fourth section.

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16

Bulloch, J. H., and A. G. Callagy. "Malfunctions of a steam turbine mechanical control system." Engineering Failure Analysis 5, no. 3 (September 1998): 235–40. http://dx.doi.org/10.1016/s1350-6307(97)00036-8.

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17

Zhao, Bin, Ling Liu, and Wenbing Zhang. "Optimization of cold end system of steam turbine." Frontiers of Energy and Power Engineering in China 2, no. 3 (July 8, 2008): 348–53. http://dx.doi.org/10.1007/s11708-008-0036-z.

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18

Stelmashchuk, S. V., and E. D. Sherov. "Electromechanical speed control system for steam turbine generator." IOP Conference Series: Materials Science and Engineering 1089, no. 1 (March 1, 2021): 012014. http://dx.doi.org/10.1088/1757-899x/1089/1/012014.

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19

Zhang, Yong Sheng, and Ying Tang. "Research on Steam Discharge System Based on Pressure Control Mode." Applied Mechanics and Materials 529 (June 2014): 569–73. http://dx.doi.org/10.4028/www.scientific.net/amm.529.569.

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In order to keep the balance of the inside and outside energy of steam power system, the main steam pressure must be effectively controlled under maneuvering condition or accident condition. A set of lumped parameter model of steam discharge system was established, its control system was designed based on the pressure control mode and the simulation of steam turbine trip accident condition was calculated. Result shows that the steam discharge control system could make the steam discharge valve open in time under accident condition. Some steam could be discharged into condenser directly through steam conditioning device. So the main steam pressure could be always maintained within normal range which improves the safety of steam turbine unit and the adaptability to steam load.

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20

Kim, Kyoung Hoon. "Effects of Water and Steam Injection on Thermodynamic Performance of Gas-Turbine Systems." Applied Mechanics and Materials 110-116 (October 2011): 2109–16. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.2109.

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The water and steam injection gas-turbine systems are comparatively investigated. Thermodynamic performances of the regenerative after-fogging gas-turbine (RAF) system, steam-injection gas-turbine (STIG) system, and the regenerative steam-injection gas-turbine (RSTIG) system are analyzed parametrically. Using the analytic model, the important system variables such as thermal efficiency, fuel consumption, specific power, and specific emission of CO2 gas are evaluated in terms of pressure ratio and water or steam injection ratio. The numerical results show that water or steam injection results in a notable enhancement of thermal efficiency and specific power.

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21

Mrzljak, Vedran. "Low Power Steam Turbine Energy Efficiency and Losses During the Developed Power Variation." Tehnički glasnik 12, no. 3 (September 25, 2018): 174–80. http://dx.doi.org/10.31803/tg-20180201002943.

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This paper investigates low power marine steam turbine during the variation in its developed power. The turbine is used for the Main Feedwater Pump (MFP) drive. Energy analysis of the Main Feedwater Pump Turbine (MFPT) is based on the measurements performed in nine different operating regimes. The measured operating parameters were steam pressure and temperature at the turbine inlet, steam pressure at the turbine outlet, and a water volume flow through MFP. Turbine energy power losses are most influenced by steam mass flow through the turbine and by steam specific enthalpy at the turbine outlet. An increase in turbine developed power causes a continuous increase in turbine energy efficiency. Analyzed turbine is balanced as most of the other steam system components – maximum energy efficiency will be obtained at the highest load, on which the majority of turbine and system operation can be expected during exploitation.

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22

Liu, Jie, and Chang Yi Jin. "Research on Applications of EPKS C300 System to Steam Turbine and Boiler." Advanced Materials Research 706-708 (June 2013): 1511–15. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.1511.

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A new HONEWELL process controlling system, namely EPKS C300, was systematically introduced. Applications of the system to 7# steam turbine and 9# boiler in the Baling Petrochemical Thermal Power Division and some important controlling strategies have been briefly investigated. EPKS C300 was used for the technical reform of the steam turbine and boiler. SCM sequence control, drum level three impulse control and DEH system modification were implemented on the boiler. With the help of FSSS system, furnace safety monitoring, automatic speed regulation of steam turbine unit, load automatic control and main steam pressure automatic control were realized.

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23

Ding, Yu Feng, and Yu Qun Zhang. "Steam Turbine Remote Maintenance Service Support Technology Based on RFID." Applied Mechanics and Materials 268-270 (December 2012): 1774–78. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.1774.

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A framework for supporting steam turbine remote maintenance support service is put forward in this paper. A RFID tag is designed to identify steam turbine. All monitored parameter data is scored in the datacenter of steam turbine cloud platform. User can get all relative data based on the unique RFID tag of steam turbine. The system can also provide fault diagnosis and maintenance solution service for steam turbine based on the fault request. The maintenance solution is given on the basis CBR (case-based reasoning) with rough set theory. A prototype system is developed to demonstrate the feasibility at last.

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24

Cai, Lin, and Miao He. "A Numerical Study on the Supersonic Steam Ejector Use in Steam Turbine System." Mathematical Problems in Engineering 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/651483.

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Supersonic steam ejector is widely used in steam energy systems such as refrigeration, wood drying equipment, papermaking machine, and steam turbine. In this paper the Computational Fluids Dynamics (CFD) method was employed to simulate a supersonic steam ejector, SST k-w turbulence model was adopted, and both real gas model and ideal gas model for fluid property were considered and compared. The mixing chamber angle, throat length, and nozzle exit position (NXP) primary pressure and temperature effects on entrainment ratio were investigated. The results show that performance of the ejector is underestimated using ideal gas model, and the entrainment ratio is 20%–40% lower than that when using real gas model. There is an optimum mixing chamber angel and NXP makes the entrainment ratio achieve its maximum; as throat length is decreased within a range, the entrainment ratio remains unchanged. Primary fluid pressure has a critical value, and the entrainment ratio reaches its peak at working critical pressure; when working steam superheat degree increases, the entrainment ratio is increased.

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25

Song, Guang Xiong, Yu Jiong Gu, Yong Yong He, and Fu Lei Chu. "A Steam Turbine Fault Diagnostic System Based on the Web and Database Technologies." Key Engineering Materials 413-414 (June 2009): 539–46. http://dx.doi.org/10.4028/www.scientific.net/kem.413-414.539.

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The steam turbine is the principal mover in the field of electric power generation. It is very important and necessary to monitor and evaluate the running conditions and diagnose the faults of the steam turbine for the safe and normal running of the electric power plant. Fault diagnosis of the steam turbine is a complicated process and requires high level of the expertise. In order to significantly reduce the cost consumed in the fault diagnosis, increase the consistency of diagnosing decision-making, and better utilize the turbine’s management information resource, in this paper, an integrated Web-based expert system of the fault diagnosis for general purpose has been developed for the steam turbine of a power station. Moreover, it can be regarded as an advisory tool to those field engineers having much technical experience and as a training tool to less-experienced personnel who need guidance and advice. This paper describes a research project aiming to develop a web-based intelligent diagnostic system for the steam turbine, and discusses the process of the fault diagnosis and the issues involved in developing the system. The paper also includes several practical issues related to the architectures of the intelligent web-based applications. The system is built on a three-tier architecture, including the following components: knowledge base, inference engine, knowledge administration interface, user interface, knowledge administration, and integrated database. The diagnostic system employs heuristic rules to diagnose the steam turbine faults.

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26

Wang, Yu Bo, Jing Liu, Ping Zhu, and Cheng Bing He. "Energy Efficiency Evaluation for Steam Turbine and Auxiliary System." Applied Mechanics and Materials 472 (January 2014): 1017–21. http://dx.doi.org/10.4028/www.scientific.net/amm.472.1017.

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Thermal power industry in China is facing energyshortage , but now there is a lack of a comprehensive energy efficiency evaluation system to promote the energy efficiency ,The energy efficiency evaluation for steam turbine and auxiliary system fills this gap. On account of the fuzziness and randomness of the evaluation process, we propose the AHM-F combination evaluation method.It not only evaluted the energy efficiency level of the steam turbine and auxiliary system,but also point out the direction for further improving of energy efficiency level. The scientificalness and effectiveness of the proposed method is verfied by the example analysis of the 600MW unit in a power plant.

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27

KAZAO, Yukihiko. "Advanced Ultra Super Critical (A-USC) Steam Turbine System." Journal of the Society of Mechanical Engineers 111, no. 1079 (2008): 849–51. http://dx.doi.org/10.1299/jsmemag.111.1079_849.

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28

KOBAYASHI, Toshiyuki, Masahiko MITSUDA, and Hideaki KUWABAWA. "4409 Development of a 100kW Radial Steam Turbine System." Proceedings of the JSME annual meeting 2006.7 (2006): 179–80. http://dx.doi.org/10.1299/jsmemecjo.2006.7.0_179.

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29

Utkin, A. V. "Synthesis of a Control System for a Steam Turbine." Automation and Remote Control 79, no. 12 (December 2018): 2186–202. http://dx.doi.org/10.1134/s0005117918120081.

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30

Utkin, A. "Synthesis of a Control System for a Steam Turbine." Автоматика и телемеханика, no. 12 (2018): 103–23. http://dx.doi.org/10.31857/s000523100002860-0.

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31

Nguyen, H. B., and A. den Otter. "Development of Gas Turbine Steam Injection Water Recovery (SIWR) System." Journal of Engineering for Gas Turbines and Power 116, no. 1 (January 1, 1994): 68–74. http://dx.doi.org/10.1115/1.2906811.

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This paper describes and discusses a “closed-loop” steam injection water recovery (SIWR) cycle that was developed for steam-injected gas turbine applications. This process is needed to support gas turbine steam injection especially in areas where water cannot be wasted and complex water treatment is discouraged. The development of the SIWR was initiated by NOVA in an effort to reduce the environmental impact of operating gas turbines and to find suitable solutions for its expanding gas transmission system to meet future air emission restrictions. While turbine steam injection provides many benefits, it has not been considered for remote, less supported environments such as gas transmission applications due to its high water consumption. The SIWR process can alleviate this problem regardless of the amount of injection required. The paper also covers conceptual designs of a prototype SIWR system on a small gas turbine unit. However, because of relatively high costs, it is generally believed that the system is more attractive to larger size turbines and especially when it is used in conjunction with cogeneration or combined cycle applications.

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32

Dzida, Marek. "On the possible increasing of efficiency of ship power plant with the system combined of marine diesel engine, gas turbine and steam turbine, at the main engine - steam turbine mode of cooperation." Polish Maritime Research 16, no. 1 (January 1, 2009): 47–52. http://dx.doi.org/10.2478/v10012-008-0010-z.

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On the possible increasing of efficiency of ship power plant with the system combined of marine diesel engine, gas turbine and steam turbine, at the main engine - steam turbine mode of cooperation This paper presents a concept of a ship combined high-power system consisted of main piston engine and associated with it: gas power turbine and steam turbine subsystems, which make use of energy contained in exhaust gas from main piston engine. The combined system consisted of a piston combustion engine and an associated with it steam turbine subsystem, was considered. An algorithm and results of calculations of the particular subsystems, i.e. of piston combustion engine and steam turbine, are presented. Assumptions and limitations taken for calculations, as well as comparison of values of some parameters of the system and results of experimental investigations available from the literature sources, are also given. The system's energy optimization was performed from the thermodynamic point of view only. Any technical - economical analyses were not carried out. Numerical calculations were performed for a Wärtsilä slow-speed diesel engine of 52 MW output power.

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33

Dzida, Marek, and Wojciech Olszewski. "Comparing combined gas tubrine/steam turbine and marine low speed piston engine/steam turbine systems in naval applications." Polish Maritime Research 18, no. 4 (January 1, 2011): 43–48. http://dx.doi.org/10.2478/v10012-011-0025-8.

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Comparing combined gas tubrine/steam turbine and marine low speed piston engine/steam turbine systems in naval applications The article compares combined systems in naval applications. The object of the analysis is the combined gas turbine/steam turbine system which is compared to the combined marine low-speed Diesel engine/steam turbine system. The comparison refers to the additional power and efficiency increase resulting from the use of the heat in the exhaust gas leaving the piston engine or the gas turbine. In the analysis a number of types of gas turbines with different exhaust gas temperatures and two large-power low-speed piston engines have been taken into account. The comparison bases on the assumption about comparable power ranges of the main engine.

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34

Barbosa dos Santos, Paulo Sérgio, Ricardo Alan Verdú Ramos, Marcelo Caldato Fiomari, Emanuel Rocha Woiski, and Thaisa Calvo Fugineri Moreti. "Performance analysis of a condensation-extraction steam turbine operating in a sugar-alcohol factory cogeneration system." International Journal for Innovation Education and Research 7, no. 8 (August 31, 2019): 275–90. http://dx.doi.org/10.31686/ijier.vol7.iss8.1675.

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In this work a thermodynamic analysis for a condensation-extraction steam turbine capable of driving a 40 MVA electric generator in a sugar-alcohol factory was carried out. Sensibility analyses were performed to evaluate the behavior of the overall energy efficiency of a plant with the condensation-extraction steam turbine in function of the boiler efficiency, the specific consumption of steam in the processes as well as the condensation rate in the turbine. The analysis results have shown that this turbine in the cogeneration system contribute to increasing the power generation, although the condensation reduces the overall efficiency of the plant. It has also been observed that the plant efficiency is very sensitive to the condensation rate variation and increases with the demand for steam in the processes.

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35

Kosman, Wojciech. "The influence of external cooling system on the performance of supercritical steam turbine cycles." Archives of Thermodynamics 31, no. 3 (September 1, 2010): 131–44. http://dx.doi.org/10.2478/v10173-010-0019-4.

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The influence of external cooling system on the performance of supercritical steam turbine cyclesThe problem presented in this paper refers to the concepts applied to the design of supercritical steam turbines. The issue under the investigation is the presence of a cooling system. Cooling systems aim to protect the main components of the turbines against overheating. However the cooling flows mix with the main flow and modify the expansion line in the steam path. This affects the expansion process in the turbine and changes the performance when compared to the uncooled turbine. The analysis described here investigates the range of the influence of the cooling system on the turbine cycle. This influence is measured mainly through the change of the power generation efficiency. The paper explains the approach towards the assessment of the cooling effects and presents results of the modeling for three supercritical steam cycles.

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36

Fu, Wen Feng, Fei Li, and Yong Ping Yang. "Collaborative Optimization for the Regenerative Heating System of a Steam Turbine Unit Considering the Steam Sources of Deaerator and Feed Pump Turbine." Applied Mechanics and Materials 347-350 (August 2013): 3907–10. http://dx.doi.org/10.4028/www.scientific.net/amm.347-350.3907.

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Based on the flow stages structure of steam turbine, the collaborative optimizing model for selecting turbine extracting openings and steam sources of deaerator and feed pump turbine has been established by means of stages combinational-searching. Taking a 600MW steam turbine unit for example, the validity of the model has been illustrated, and various optimization schemes have been obtained with different steam sources of deaerator and feed pump turbine. The results show that the standard coal consumption rate can be decreased by up to 0.78069g/kW·h when the extracting openings are fixed. And the standard coal consumption rate can be decreased by up to 0.93342g/kW·h when the extracting openings are optimized collaboratively. The optimization method has referenced value for optimizing and designing the regenerative heating system.

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37

Zhang, Jin Feng, Zai Xing Li, Xin Liu, and Zhong Qiang Sun. "Safety System Analysis on Gas-Steam Combined Cycle Power Plant." Advanced Materials Research 860-863 (December 2013): 1458–63. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.1458.

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Risk factor in gas-steam combined cycle power plant (CCPP) was identified by application of safety system engineering principles and techniques. The CCPP system was divided into gas transmission subsystem, gas turbine subsystem, waste heat boiler subsystem, steam turbine subsystem and generation & transformation subsystem. The accident-proneness areas in each subsystem were studied, and various accident-causation modes were clarified. The bursting leakage accident caused by failure of steam-water pipelines was analyzed, and evaluated with Fault Tree method. The targeted countermeasures of safe operation and management were proposed.

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Kail, C. "Evaluation of Advanced Combined Cycle Power Plants." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 212, no. 1 (February 1998): 1–12. http://dx.doi.org/10.1177/095765099821200101.

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This report will analyse and evaluate the most recent and significant trends in combined cycle gas turbine (CCGT) power plant configurations. The various enhancements will be compared with the ‘simple’ gas turbine. The first trend, a gas turbine with reheat, cannot convert its better efficiency and higher output into a lower cost of electrical power. The additional investments required as well as increased maintenance costs will neutralize all the thermodynamic performance advantages. The second concept of cooling the turbine blades with steam puts very stringent requirements on the blade materials, the steam quality and the steam cooling system design. Closed-loop steam cooling of turbine blades offers cost advantages only if all its technical problems can be solved and the potential risks associated with the process can be eliminated through long demonstration programmes in the field. The third configuration, a gas turbine with a closed-loop combustion chamber cooling system, appears to be less problematic than the previous, steam-cooled turbine blades. In comparison with an open combustion chamber cooling system, this solution is more attractive due to better thermal performance and lower emissions. Either air or steam can be used as the cooling fluid.

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Barrios, José Angel, F. Sanchez, Francisco Gonzalez-Longatt, and Gianfranco Claudio. "System identification applied to a single area electric power system under frequency response." Indonesian Journal of Electrical Engineering and Computer Science 22, no. 3 (June 1, 2021): 1236. http://dx.doi.org/10.11591/ijeecs.v22.i3.pp1236-1244.

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This research paper proposes a methodology to apply identification methods to find a simplified model of three different governors in a single area electric power system (SAEPS). A SAEPS with different governors-turbine is presented: a hydraulic turbine, a steam turbine and a steam reheat turbine. In this same investigation, an analytic reduction has been performed, a fifth order system was found analytically, thus a transfer function equivalent to the three different governor-turbine elements was obtained, this equivalent transfer function models the complete behavior of the three devices. Two systems identification (SI) algorithms have been proposed to apply them to this generic subspace state-space (N4SID) and generalized poisson moment functionals (GPMF) electrical system, these presented similar results. The results of the performance and simulation analysis exhibit that using the SI technique, fifth, fourth and third-order systems were obtained that graphically show a very small estimation error compared to the original signal, this fact could be check simulating the simplified models using the same input-output data. The results are presented in a table that shows a comparison of the model respond the fifth, fourth, third and second-order systems.

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Akramian, K., M. Moosavi, and A. Etminan. "Exergy Analysis of Micro Gas Turbine Tri- Generation System." Advanced Materials Research 433-440 (January 2012): 6641–45. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.6641.

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This paper presents exergy analysis of Micro Gas Turbine (MGT) system. It is proposed to use hot MGT exhaust gases heat in a heat recovery steam generator to produce steam. Absorption chillers can help to increase the performance of MGT tri generation plants. MGTs are fuelled with natural gas and their waste heat is used to drive absorption chillers and other thermal energy users. Based on a steady-state model of the processes, exergy flow rates are calculated for all components and a detailed exergy analysis is performed. The components with the highest proportion of irreversibility in these systems are identified and compared.

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Zhong, Zaixi, Zhaoyi Huo, Xin Wang, Feng Liu, and Yuhua Pan. "New steam turbine operational mode for a gas turbine combine cycle bottoming cycle system." Applied Thermal Engineering 198 (November 2021): 117451. http://dx.doi.org/10.1016/j.applthermaleng.2021.117451.

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Zhu, Ya Qing, Min Zhong, Yu Jia Ma, Feng Ping Pan, Ling Ling Shi, and Zhi Qiang Pang. "Research on the Relationship between Speed Control System and Electromechanical Oscillations." Applied Mechanics and Materials 710 (January 2015): 47–52. http://dx.doi.org/10.4028/www.scientific.net/amm.710.47.

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The system damping of electric power systems is influenced by factors of many aspects. In this paper, we analyzed the impact of speed control system on the damping of the whole system in consideration of the Pole-Zero Analysis. The result shows that simple speed control would damp the oscillation, while the power-frequency control would excite the oscillation. Furthermore, the effect of steam turbine response rate on the system damping is analyzed. The time constant of hydraulic servo-motor would determine the response rate of the steam turbine, and as a result, an inflection point exists on the curve which describes the relationship between hydraulic servo-motor time constant and system damping. The result demonstrates that the characteristics of system damping can be used in parameter debugging of steam turbine.

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Mazur, Z., G. Urquiza, and R. Campos. "Improvement of the Turbine Main Stop Valves with Flow Simulation in Erosion by Solid Particle Impact CFD." International Journal of Rotating Machinery 10, no. 1 (2004): 65–73. http://dx.doi.org/10.1155/s1023621x04000077.

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The flow field in a steam turbine main stop valve bypass valve (MSVBV) has been investigated by means of CFD simulations. Because the entire flow to the turbine during start ups is carried by the MSVBV it is subject to serious solid particle erosion problems and requires frequent replacement to avoid the catastrophic damage which can occurred when the MSVBV skirt eroded through causing large pieces of metal to be carried directly into the turbine. For some of the most important geometric parameters of the MSVBV, design recommendation have been made.

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Balda, Miroslav, and Olga Červená. "Residual Fatigue Lives of Steam Turbine Blades." Applied Mechanics and Materials 827 (February 2016): 121–24. http://dx.doi.org/10.4028/www.scientific.net/amm.827.121.

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The paper deals with an assessment of blade tip movements based on precise time measurement known under abbreviation BTT - Blade Tip Timing. In addition to the common way of BTT data processing, a new Residual Fatigue Lives of Blades system (RFLB) proceeds further up to estimation of blade damages by processing output files generated by BTT systems.

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Gosling, M. C. "Improved Turbine Cylinder Bolting System." Journal of Engineering for Gas Turbines and Power 119, no. 4 (October 1, 1997): 973–77. http://dx.doi.org/10.1115/1.2817085.

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This paper describes the design and development of a new cylinder bolting system to replace the main joint hardware for both combustion (and steam) turbine applications. The new bolts are designed to be hydraulically tensioned to the specified preload and utilize ultrasonic verification of elongation. The new bolting system uses a reduced number of components in each assembly and the individual components themselves are of a simplified design. The new hardware can be applied to new equipment without modification and retrofitted to customer-owned equipment as a direct replacement for existing joint hardware. The prototype, production, and field testing of this hardware, the installation tooling; and ultrasonic elongation measuring equipment are described. This testing has shown significant savings in assembly and disassembly cycle times even after prolonged exposure to turbine operating temperatures in a corrosive environment. The new design of bolting is now standard equipment for the CW251B11/B12 combustion turbine manufactured by Westinghouse P.G.B.U.

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Пугач, Леонид, Leonid Pugach, Павел Куницын, Pavel Kunitsyn, Александр Стребков, and Aleksandr Strebkov. "Automation balance calculations system of recovery feed water at work energy units of thermal power plants." Bulletin of Bryansk state technical university 2015, no. 3 (September 30, 2015): 40–51. http://dx.doi.org/10.12737/22991.

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The problems of optimizing and automating the process of calculating the thermal schemes steam-turbine plants. The possibility of using different means of software Mathcad for calculation of the energy and mass balance of energy units. Investigated the matrix method for solving equations of heat balance diagrams of steam-turbine plants.

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Li, Shao Hua, Yang Song, and Tie Ying Wang. "3-D Dynamic Simulation System in the Application of the Power Plant Steam Turbine Overhaul." Advanced Materials Research 960-961 (June 2014): 1620–25. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.1620.

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With the rapid development of the power industry, there has been more and more large thermal power unit which is more than or equal to 600MW , steam turbine equipment gradually tend to be high parameter, large capacity, complicated, the overhaul maintenance to steam turbine is the main content of the power plant production activities, it directly affects the reliability of the coal-fired power plant production safety. Aimed at the complexity of thermal steam turbine overhaul, by the use of advanced interactive devices on the visual, do an auditory perception of the virtual environment for something, which is helpful to improve practical operation skills. This paper examines the necessity and superiority of this system applied in education and training. Taking 3-D dynamic simulation system of building as an example, this paper discussed how to utilize the SolidWorks2012 and VRP - SDK to build a virtual training system, realized the combination with virtual reality and education training ,also greatly promoted science and technology progress，equipment of the steam turbine overhaul industry.

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Nasteka, Denis V., and Aleksandra I. Lebedeva. "Using a Robotic System in Repairing Steam Turbine Rotor Blades." Vestnik MEI 6, no. 6 (2018): 27–32. http://dx.doi.org/10.24160/1993-6982-2018-6-27-32.

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INOMATA, Asako, Katsuya YAMASHITA, Kazuhiro SAITO, Kunihiko WADA, Shogo IWAI, and Takeo TAKAHASHI. "E102 Development of Advanced-Ultra Super Critical Steam Turbine System." Proceedings of the National Symposium on Power and Energy Systems 2010.15 (2010): 163–64. http://dx.doi.org/10.1299/jsmepes.2010.15.163.

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KOBAYASHI, Toshiyuki, Hideaki KUWABAWA, Masahiko MITSUDA, and Hirohide FURUTANI. "OS9-1 Power Generating System with 100kW Radial Steam Turbine." Proceedings of the National Symposium on Power and Energy Systems 2006.11 (2006): 241–42. http://dx.doi.org/10.1299/jsmepes.2006.11.241.

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