Development and experimental validation of a computational model for a helically coiled steam generator

The evaporation system of the ultra-supercritical power plant is characterized with a once-through steam generator. Modeling of such evaporation system is of extreme importance for the purpose of efficiency assessment and operation optimization. There still exist some major problems in the modeling because of the complexity of the phase transitions in the evaporation system at different loads. This paper establishes a moving segment model (including subcooled water, saturated two-phase and superheated steam segments) based on the mass and energy conservation principles under the subcritical and supercritical working conditions, and proposes a solution algorithm to deal with working condition switching in an automatic mode. Pseudo-online simulations are performed to test the model and the algorithm by using the geometric parameters and the history operation data of a real ultra-supercritical unit in China. The calculated heat absorption rate of the working fluid from the entire evaporation system agrees well with the reference value. The maximum absolute relative error is found as small as 0.54% in the time resolution of 30 min, which indirectly demonstrates the feasibility and accuracy of the presented model and the solution algorithm.

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“…Combining Eqs. (8), (11) and (13), the mass storage of the working fluid in the entire evaporation system is:…”

Section: Moving Segment Modelmentioning

confidence: 99%

“…The evaporation system of the ultra-supercritical power plant is a typical distributed parameter system [11][12][13]. In literature, the evaporation system may be spatially discretized into finite control volumes.…”

Section: Introductionmentioning

confidence: 99%

Dynamic modeling and solution algorithm of the evaporation system for the ultra-supercritical power plant

Yuan

Wang

2017

International Journal of Heat and Mass Transfer

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“…Best results have been obtained via the analytical model, on the basis of a modified form of the widespread and sound Lockhart-Martinelli two-phase friction multiplier, previously tuned on the frictional characteristics of the system (Colorado et al, 2011). The modified Lockhart-Martinelli multiplier (only-liquid kind) used for the calculations reads: 3.2789 0.3700 1…”

Section: Analytical Modelling Of the Experimental Facilitymentioning

confidence: 99%

Two Phase Flow, Phase Change and Numerical Modeling

Ahsan¹

2011

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Malaysia, Malaysia. He received a Ph.D in Civil Engineering from the University of Fukui, Japan. He has been involved in collaboration research with many researchers and scientists in the world since 2004 and published in diverse areas of Civil and Environmental Engineering. He has published 3 books, 6 book chapters, over 19 technical papers, and is a member of the editorial board of numerous international technical journals. He has been serving on the scientific and editorial board of InTech Open Access Publisher since 2010.

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“…In their paper, they compared the trend of the heat transfer coefficient in different peripheral angles with Owhadi et.al [35] experimental results. D. Colorado-Garrido et.al [36,37] developed a one-dimensional computational method based on finite volume by discretization of continuity, momentum and energy equations and coupling them with implicit step by step method to investigation of heat transfer and fluid dynamic behavior for water flow boiling in a helically double-pipe vertical evaporator. They verified the proposed model with experimental data base provided by L.Santini [38] and Santoyo-Castelazo and Siqueiros [39] is presented in order to obtain this goal.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of flow boiling heat transfer in helically coiled tube under constant heat flux

Abdous

Holagh

Saffari

2018

TSE

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Numerical study of subcooled and saturated flow boiling in the curved and helically coiled tubes in presence of phase change is one of the challenging area of CFD studies. In this paper, the CFD modeling of the nucleate and convective flow boiling in the small helically coiled tube at low vapor quality (up to the 18.93 percent) region is studied. A proper Eulerian-based mathematical model is used for interphase exchange forces and heat transfer between two phases in CFD modeling using Bulk boiling model. The results show that, the inner and the bottom wall of the helically coiled tube have the lowest and the highest heat transfer coefficient, respectively. The effect of change in coil diameter, helical pitch and tube diameter is investigated on the counters of vapor volume fraction. It is seen that at low vapor quality flows, the heat transfer coefficient is enhanced by decreasing in coil diameter, tube diameter and increasing in coil pitch of helically coiled tube.

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Development and experimental validation of a computational model for a helically coiled steam generator

Cited by 61 publications

References 25 publications

Dynamic modeling and solution algorithm of the evaporation system for the ultra-supercritical power plant

Dynamic modeling and solution algorithm of the evaporation system for the ultra-supercritical power plant

Two Phase Flow, Phase Change and Numerical Modeling

Numerical investigation of flow boiling heat transfer in helically coiled tube under constant heat flux

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