Studies on flow instability of helical tube steam generator with Nyquist criterion

Niu, Fenglei; Tian, Li; Yu, Yu; Li, Rizhu; Norman, Timothy L.

doi:10.1016/j.nucengdes.2013.10.026

Cited by 18 publications

(2 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After, the superheated steam enters in a turbine where it produces an expansion through and adiabatic, reversible process. The superheat process is necessary in order to guarantee that within turbine only steam is present, this preserving the turbine blades from condensation and erosion [8,9]. However, the amount of superheat should be kept as lower as possible in order to avoid waste of energy and maximize the thermal efficiency performance of entire cycle.…”

Section: Methodsmentioning

confidence: 99%

Thermodynamics Analyses on Regenerative Steam Cycle With Two Tanks for HTGR-10 Concept

Sudadiyo

Sunaryo

2017

gnd

View full text Add to dashboard Cite

THERMODYNAMICS ANALYSES ON REGENERATIVE STEAM CYCLE WITH TWO TANKS FOR HTGR-10 CONCEPT. In this work, steam cycle from a nuclear power plant is explored in order to increase electric power efficiency and output. A thermal source in the form of a HTGR-10 concept is considered. The power conversion unit of HTGR-10 consists of steam generators, turbines, condensers, pumps , and connecting pipes. Helium is used as the core coolant and the working fluid for power conversion unit is water/steam. The proposed thermodynamic process modification has been evaluated for regenerative steam power cycle of this reactor. The scope of study covered regenerative steam cycle with two tanks including feed water tank and intermediate feed water tank. The evaluation analyzes the effect of pressure, efficiencies of turbine and pumps, and tanks against thermal efficiency. The Cycle-Tempo software is used to simulate and optimize those effects on steam cycle based on HTGR-10. The results indicate improvements of as much as 2.65 % in thermal efficiency and 0.271 MWe in electric power.

show abstract

Section: Methodsmentioning

confidence: 99%

Thermodynamics Analyses on Regenerative Steam Cycle With Two Tanks for HTGR-10 Concept

Sudadiyo

Sunaryo

2017

gnd

View full text Add to dashboard Cite

show abstract

“…More recently, experimental and theoretical studies were performed by Papini et al [3] to investigate DWO in single and 2 Science and Technology of Nuclear Installations two parallel helically coiled tubes. Frequency domain method was employed to evaluate DWO in HTR-10 in the study of Niu et al [11]. Most studies with respect to flow instabilities have been limited to constant wall temperature or constant wall heat flux conditions, using electrically heated tubes to assure uniform power distribution.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Density Wave Oscillations in Helically Coiled Tube Once-Through Steam Generator

Hao

Zhang

Zheng

et al. 2016

Science and Technology of Nuclear Installations

View full text Add to dashboard Cite

Helically coiled tube Once-Through Steam Generator (H-OTSG) is one of the key equipment types for small modular reactors. The flow instability of the secondary side of the H-OTSG is particularly serious, because the working condition is in the range of low and medium pressure. This paper presents research on density wave oscillations (DWO) in a typical countercurrent H-OTSG. Based on the steady-state calculation, the mathematical model of single-channel system was established, and the transfer function was derived. Using Nyquist stability criterion of the single variable, the stability cases were studied with an in-house computer program. According to the analyses, the impact law of the geometrical parameters to the system stability was obtained. RELAP5/MOD3.2 code was also used to simulate DWO in H-OTSG. The theoretical analyses of the in-house program were compared to the simulation results of RELAP5. A correction factor was introduced to reduce the error of RELAP5 when modeling helical geometry. The comparison results agreed well which showed that the correction is effective.

show abstract

Investigation of density wave instability in once-through superheated steam generators using SIGHT

Tang

Zhou

Zhang

2017

Annals of Nuclear Energy

View full text Add to dashboard Cite

Studies on flow instability of helical tube steam generator with Nyquist criterion

Cited by 18 publications

References 6 publications

Thermodynamics Analyses on Regenerative Steam Cycle With Two Tanks for HTGR-10 Concept

Thermodynamics Analyses on Regenerative Steam Cycle With Two Tanks for HTGR-10 Concept

Analysis of Density Wave Oscillations in Helically Coiled Tube Once-Through Steam Generator

Investigation of density wave instability in once-through superheated steam generators using SIGHT

Contact Info

Product

Resources

About