Results 221 to 230 of about 1,562 (254)
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Multiple Models Predictive Control of Once-Through Steam Generator
Volume 3: Thermal Hydraulics; Instrumentation and Controls, 2008Because of multiphase flow during the heat transfer, OTSG (Once-Through Steam Generator) is a complex nonlinear MIMO (Multiple Input and Multiple Output) system. This article sets the mathematics model of OTSG with internal screw and double tubes, uses the FOROTSG program to simulate OTSG, and identifies the system models of different power levels ...
Yun Tai, Su-Xia Hou, Fu-Yu Zhao
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A Movable Boundary Model for Once-Through Steam Generator Analysis
Nuclear Technology, 1988A method was developed for the analysis of a once-through steam generator that is based on a multinode movable boundary formulation and an accurate description of the departure from nucleate boilin...
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Two-Phase Flow Interfacial Drag for Once-Through Steam Generators
Nuclear Technology, 1991This paper reports on the current version of the RELAP5/MOD2 computer code which underpredicts the degree of superheat in the secondary side of the steam generator bundles. Many studies have concluded that this is due to overprediction of the interphase drag force.
Yassin A. Hassan, Omar Rais
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Control and Operability of Economiser Bypass in Once-through Steam Generators
IFAC Proceedings Volumes, 2011Abstract The paper considers the control and operability issues in using bypass of sections of the heat exchanger to manage thermal oscillations observed in start-up operation of once through steam generators.
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A New Approach to Optimal Control of Supercritical Once-Through Steam Generator
IFAC Proceedings Volumes, 1984Abstract This paper presents a new approach to the design of an optimal servo-type controller for a supercritical once-through steam generator under variable pressure operation. To derive a state-space model of the thermal power plant, a linear multivariable input-output model is fitted to the open loop data obtained from the actual plant.
T. Katayama +3 more
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Fuel Controller Design in a Once-Through Subcritical Steam Generator System
Journal of Engineering for Power, 1978Established techniques have been applied for modeling a once-through subcritical steam generator in an oil-fired 386 MW(e) power generation system. The model was used to design a fuel controller which was implemented in the actual plant. The resulting minimum stable operating level of the system has been reduced from 220 MW(e) to flash tank level of ...
Yu-Hwan Lin, R. S. Nielsen, A. Ray
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Dynamic Modeling of a Utility Once-Through Pulverized-Fuel Steam Generator
Journal of Energy Engineering, 2017AbstractThis study aims at modeling and simulating the transient operation of a utility supercritical steam generator fired with pulverized hard coal.
Dimitrios Rakopoulos +4 more
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Inner tube optimization of double-tube once-through steam generator
International Journal of Heat and Mass Transfer, 2013Abstract We present a double-tube once-through steam generator (DOTSG) with an outer straight tube and an inner helical tube in this paper. For the purpose of the compact structure and lower pressure drop, the inner helical tube is optimized. The tube length and the combined pressure drop are considered as the two objective functions, and the pitch ...
Xinyu Wei +3 more
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Helical Pitch Optimization of Double-Tube Once-Through Steam Generator
Volume 2A: Thermal Hydraulics, 2014Once-Through Steam Generator (OTSG) is widely used in nuclear reactor system due to its advantages of compactness. The heat transfer performance of DOTSG is studied in this paper. In order to minimize the DOTSG volume and reduce the pressure drop of coolant, the pitch of inner helical tube is optimized with Pontryagin Maximum Principle (PMP).
Huawei Fang +4 more
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Research on Autonomous Decision-Making Technology For Once-Through Steam Generator
Annals of Nuclear Energy, 2023Ren Yu +4 more
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