A lumped parameter dynamic model of the helical coiled once-through steam generator with movable boundaries

Li, Haipeng; Huang, Xiaojin; Liangju, Zhang

doi:10.1016/j.nucengdes.2008.01.009

Cited by 70 publications

(33 citation statements)

References 6 publications

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“…Actually between the response quality level and saturation bound um. Furthermore, from part (d) of Figures 4 and 5, saturation bound um is smaller, the mismatch between ξ and ξd, i.e., eξ is larger, and however the closed-loop stability is still guaranteed, which is given by compensation effect caused by term ucp determined by Equations (19)- (21). As we can see from part (f) of Figures 4 and 5, the compensating effect generated by ucp is stronger if um is smaller, and is dissipated as the entire system converges to a given steady state.…”

Section: Discussionmentioning

confidence: 97%

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Saturated Adaptive Output-Feedback Power-Level Control for Modular High Temperature Gas-Cooled Reactors

Dong

2014

Energies

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Small modular reactors (SMRs) are those nuclear fission reactors with electrical output powers of less than 300 MWe. Due to its inherent safety features, the modular high temperature gas-cooled reactor (MHTGR) has been seen as one of the best candidates for building SMR-based nuclear plants with high safety-level and economical competitive power. Power-level control is crucial in providing grid-appropriation for all types of SMRs. Usually, there exists nonlinearity, parameter uncertainty and control input saturation in the SMR-based plant dynamics. Motivated by this, a novel saturated adaptive output-feedback power-level control of the MHTGR is proposed in this paper. This newly-built control law has the virtues of having relatively neat form, of being strong adaptive to parameter uncertainty and of being able to compensate control input saturation, which are given by constructing Lyapunov functions based upon the shifted-ectropies of neutron kinetics and reactor thermal-hydraulics, giving an online tuning algorithm for the controller parameters and proposing a control input saturation compensator respectively. It is proved theoretically that input-to-state stability (ISS) can be guaranteed for the corresponding closed-loop system. In order to verify the theoretical results, this new control strategy is then applied to the large-range power maneuvering control for the MHTGR of the HTR-PM plant. Numerical simulation results show not only the relationship between regulating performance and control input saturation bound but also the feasibility of applying this saturated adaptive control law practically. OPEN ACCESSEnergies 2014, 7 7621

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Section: Discussionmentioning

confidence: 97%

“…The OTSG model is just the moving boundary model presented in [21]. Furthermore, the model of the steam turbine and that of the electrical generator are also included in the simulation code [22].…”

Section: Description Of the Numerical Simulationmentioning

confidence: 99%

Saturated Adaptive Output-Feedback Power-Level Control for Modular High Temperature Gas-Cooled Reactors

Dong

2014

Energies

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“…Finally, three balance equations for the water-wall model are given by (8), (21), and (22) using (16), (20), and (23).…”

Section: Momentum Balancementioning

confidence: 99%

“…Basic Balance Eqs. [3,7,[19][20][21][22] The fundamental principles used in developing the model are mass balance, energy balance, and momentum balance. Table 1 shows the nomenclature used in this paper.…”

Section: Introductionmentioning

confidence: 99%

A Water-Wall Model of Supercritical Once-Through Boilers Using Lumped Parameter Method

Go¹,

Moon²

2014

Journal of Electrical Engineering and Technology

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-This paper establishes a compact and practical model for a water-wall system comprising supercritical once-through boilers, which can be used for automatic control or simple analysis of the entire boiler-turbine system. Input and output variables of the water-wall system are defined, and balance equations are applied using a lumped parameter method. For practical purposes, the dynamic equations are developed with respect to pressure and temperature instead of density and internal energy. A comparison with results obtained using APESS, a practical thermal power plant simulator developed by Doosan Heavy Industries and Construction, is presented with respect to steady state and transient responses.

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“…When steam is used as the working fluid (CSP application) or as the reactant in high-temperature systems (STEP and SHTE applications), the understanding of the complex two-phase flow boiling process inside the absorber tubes of the direct steam generation receiver is important for identifying local hot spots, and designing and predicting receiver performance. The modeling approach for the coupled heat transfer and fluid flow problem in direct steam generation solar receivers can be inspired by the design of conventional steam generators or evaporators in coal-fired boiler power plants [19,20], pressurized water reactors (PWR) in nuclear power plants [21][22][23], and vapor-compression refrigeration system [24,25]. The development of a full 3D mechanistic model of the flow boiling process is challenging [26] due to the complex nature of the processes involved (activation of nucleation sites, bubble dynamics, and interfacial heat transfers) and the computational needs required for the solution of the direct numerical problem, which incorporates a large number of bubbles and surfaces with complex geometries [27,28].…”

Section: Introductionmentioning

confidence: 99%

Modeling and design guidelines for direct steam generation solar receivers

et al. 2018

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• A computational model for solar receiver for direct steam generation is developed.• Experiments are conducted and used to validate the model.• Practical designs, operational conditions and material choices are investigated.• Model provides design tool for direct steam generation solar cavity receivers. A R T I C L E I N F OKeyword: Solar energy Multi-mode heat transfer modeling Two-phase flow modeling Solar receiver Steam generator Concentrated solar A B S T R A C T Concentrated solar energy is an ideal energy source for high-temperature energy conversion processes such as concentrated solar power generation, solar thermochemical fuel production, and solar driven high-temperature electrolysis. Indirectly irradiated solar receiver designs utilizing tubular absorbers enclosed by a cavity are possible candidates for direct steam generation, allowing for design flexibility and high efficiency. We developed a coupled heat and mass transfer model of cavity receivers with tubular absorbers to guide the design of solardriven direct steam generation. The numerical model consisted of a detailed 1D two-phase flow model of the absorber tubes coupled to a 3D heat transfer model of the cavity receiver. The absorber tube model simulated the flow boiling phenomena inside the tubes by solving 1D continuity, momentum, and energy conservation equations based on a control volume formulation. The Thome-El Hajal flow pattern maps were used to predict liquid-gas distributions in the tubular cross-sections, and heat transfer coefficients and pressure drop along the tubes. The heat transfer coefficient and fluid temperature of the absorber tubes' inner surfaces were then extrapolated to the circumferential of the tube and used in the 3D cavity receiver model. The 3D steady state model of the cavity receiver coupled radiative, convective, and conductive heat transfer. The complete model was validated with experimental data and used to analyze different receiver types and designs made of different materials and exposed to various operational conditions. The proposed numerical model and the obtained results provide an engineering design tool for cavity receivers with tubular absorbers (in terms of tube shapes, tube diameter, and water-cooled front), support the choice of best-performant operation (in terms of radiative flux, mass flow rate, and pressure), and aid in the choice of the component materials. The model allows for an indepth understanding of the coupled heat and mass transfer in the solar receiver for direct steam generation and can be exploited to quantify the optimization potential of such solar receivers.

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A lumped parameter dynamic model of the helical coiled once-through steam generator with movable boundaries

Cited by 70 publications

References 6 publications

Saturated Adaptive Output-Feedback Power-Level Control for Modular High Temperature Gas-Cooled Reactors

Saturated Adaptive Output-Feedback Power-Level Control for Modular High Temperature Gas-Cooled Reactors

A Water-Wall Model of Supercritical Once-Through Boilers Using Lumped Parameter Method

Modeling and design guidelines for direct steam generation solar receivers

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