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Dynamic characteristics analysis of a once-through heat recovery steam generator
Applied Thermal Engineering, 2020Abstract A U-type once-through heat recovery steam generator (HRSG) is investigated in this paper and emphasis is laid on a mathematical model for its dynamic characteristics analysis. The model is built in the Matlab/Simulink environment based on the thermodynamics principles and conservations of mass, momentum, and energy. Genetic algorithm (GA) is
Wenjing Du, Jinbo Li, Baoqiang Yuan
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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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Flow Distribution in Forced-Circulation Once-Through Steam Generators
Journal of Fluids Engineering, 1934Abstract Forced-circulation, once-through steam generators of large capacity are constructed of several parallel circuits connected between inlet and discharge headers. Unequal flow distribution between these circuits, possibly resulting in tube failure, may be due to unequal frictional resistances, unequal heat absorption, or improper ...
H. L. Solberg +2 more
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Aperiodic Instability of a Once-Through Steam Generator with a Feedwater Line
Volume 2: Thermal Hydraulics, 2006Aperiodic (static) flow instability is an instability related to the change of a flow direction in individual steam generating U-shaped channels operating at given pressure difference. The nature of an aperiodic instability is close to a Ledinegg instability [1] related to the presence of multiple flows at the full hydraulic curve of a U-shaped channel.
Jae-Kwang Seo +3 more
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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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Thermal Analysis of a Helical Tube Once Through Steam Generator of HTGR
Volume 1: Heat Transfer in Energy Systems; Theory and Fundamental Research; Aerospace Heat Transfer; Gas Turbine Heat Transfer; Transport Phenomena in Materials Processing and Manufacturing; Heat and, 2012Steam Generator (SG) is one of the most important pieces of equipment in High Temperature Gas-cooled Reactor (HTGR). It requires high reliability in a very critical working condition. The thermal analysis of HTGR SG and its uncertainty becomes very important. Large thermal non-uniformity and the resulting high temperature will damage the structure. The
Xiaowei Luo +3 more
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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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Dynamic simulation of once-through steam generator with concentric annuli tube
Annals of Nuclear Energy, 2012Abstract Based on the conservation equations of mass, energy, and momentum, the mathematical model of once-through steam generator (OTSG) with concentric annuli tube is developed by moving boundary. The heat transfer section of OTSG is divided into three regions: subcooled, nucleate boiling and superheated regions.
Jingyan Zhu, Yun Guo, Zhijian Zhang
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