Influence of a circular strainer on unsteady flow behavior in steam turbine control valves

Wang, Peng; Liu, Yingzheng

doi:10.1016/j.applthermaleng.2016.12.073

Cited by 19 publications

(5 citation statements)

References 16 publications

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“…Exergy destruction of the analyzed steam pressure reduction valve is caused by an increase in steam specific entropy at the valve outlet during the pressure reduction. Increase in outlet steam specific entropy causes decrease in outlet specific exergy, equation 4, what causes that exergy destruction is sensibly higher than zero, equation (10). Pressure reduction valve exergy efficiency was calculated according to equation (11).…”

Section: The Results Of Pressure Reduction Valve Exergy Analysis and mentioning

confidence: 99%

“…In scientific and professional literature can rarely be found detail analysis of any valves. If some of them were found, mostly it is investigations of control valves for steam turbines [9,10], in some cases along with its actuation systems [11]. Detailed analysis of steam pressure reduction valves is rare, especially for various steam system loads [12].…”

Section: Introduction / Uvodmentioning

confidence: 99%

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Eksergijska analiza ventila tlaka pare kod pomorskoga porivnog postrojenja na konvencionalnom LNG tankeru

Mrzljak

Poljak²,

Žarković

2018

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Paper has presented an exergy analysis of steam pressure reduction valve, unavoidable element in the steam propulsion plant on LNG carrier. The steam pressure reduction valve was analyzed in a wide range of steam system loads. Along with pressure decrease, through the valve also occur decrease in steam temperature and increase in steam specific entropy. The pressure decrease of the analyzed valve ranges from 4.846 MPa up to 5.027 MPa while the average steam temperature decrease for the whole observed operating range amounts 74.8 °C. At the ambient temperature of 25 °C, valve exergy destruction ranges from 121.72 kW up to 180.64 kW, while exergy efficiency amounts from 80.28 % up to 80.54 %. Variation in the ambient temperature, for the expected engine room temperature range, showed that the exergy destruction of pressure reduction valve increases and exergy efficiency decreases during the increase in the ambient temperature. The lowest average value of pressure reduction valve exergy destruction was obtained at the ambient temperature of 10 °C and amounts 152.03 kW, while at the same ambient temperature was obtained the highest average exergy efficiency of 82.77 %. The highest valve exergy destruction and the lowest exergy efficiency were obtained at the highest observed ambient temperature of 40 °C. Sažetak Članak predstavlja eksergijsku analizu redukcijskog ventila tlaka pare, nezaobilazni element u parnom porivnom postrojenju na LNG brodu. Redukcijski ventil tlaka pare analiziran je u širokom spektru opterećenja porivnog postrojenja. Uz pad tlaka kroz ventil se također događa pad temperature pare i rast u specifičnoj parnoj entropiji. Pad tlaka analiziranog ventila kreće se od 4.846 MP do 5.027 MP dok prosječan pad temperature pare za cijeli promatrani proces iznosi 74.8°C. Kod ambijentalne temperature od 25°C destrukcija eksergije ventila kreće se od 121.72 kW do 180.64 kW dok eksergijska djelotvornost iznosi od 80.28 % do 80.54 %. Varijacija u ambijentalnoj temperaturi za očekivani raspon temperature u strojarnici je pokazala da destrukcija eksergije redukcijskog ventila raste, a eksergijska djelotvornost opada za vrijeme rasta ambijentalne temperature. Najniža prosječna vrijednost destrukcije eksergije redukcijskog ventila dobivena je pri ambijentalnoj temperaturi od 10°C i iznosi 152.03 kW dok je istovremeno na istoj ambijentalnoj temperaturi dobivena najveća prosječna eksergijska djelotvornost od 82.77 %. Najviša destrukcija eksergije ventila i najniža eksergijska djelotvornost dobivene su na najvišoj promatranoj ambijentalnoj temperaturi od 40°C. KEY WORDS pressure reduction valve exergy destruction exergy efficiency ambient temperature KLJUČNE RIJEČI redukcijski ventil tlaka eksergijska destrukcija eksergijska djelotvornost ambijentalna temperatura

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Section: The Results Of Pressure Reduction Valve Exergy Analysis and mentioning

confidence: 99%

Section: Introduction / Uvodmentioning

confidence: 99%

Eksergijska analiza ventila tlaka pare kod pomorskoga porivnog postrojenja na konvencionalnom LNG tankeru

Mrzljak

Poljak²,

Žarković

2018

Naše more

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“…Shiyang et al [13] studied the dynamic characteristics of a solenoid valve using transient CFD numerical calculations and experiments. Some authors [14,15] used the Reynolds-Averaged Navier-Stokes (RANS) simulation method with the shear stress transport (SST) turbulent closure to analyze flow properties in turbine control valves. In general, these works focused more on the flow properties in valves; they do not address the issues of the combined heat transfer characteristics in fluids and high-pressure pneumatic control valves.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of the Conjugate Heat Transfer for a High-Pressure Pneumatic Control Valve Assembly

Ngwa

Gao

2022

Entropy

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This paper uses heat transfer experiments and computational fluid dynamics (CFD) simulations to investigate the conjugate heat transfer (CHT) in a high-pressure pneumatic control valve assembly. A heat transfer test rig was constructed, and time–temperature histories of five test points placed on the valve assembly’s outer surface were recorded for study validation. The Unsteady Reynolds-Averaged Navier–Stokes (URANS) CFD methods with the standard k-ɛ turbulence closure equations were adopted in the numerical computations. Polyhedral grids were used; time step and mesh convergence studies were conducted. Simulated and measured temperatures profile comparisons revealed a good agreement. The CHT results obtained from CFD showed huge velocity fields downstream of the valve throat and the vent hole. The airflow through the valve was icy, mainly in the supersonic flow areas. Low temperatures below 273.15 K were recorded on the internal and external walls of the valve assembly. The consistency of the measured data with the numerical results demonstrates the effectiveness of polyhedral grids in exploring the CHT using CFD methods. The local entropy production rate analysis revealed that irreversibility is mainly due to viscous dissipation. The current CHT investigation provides a potential basis for thermostress analysis and optimization.

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“…It produces qualified steam by throttling, diffusing and water spraying [2][3]. The complex internal structure [4], two-phase flow of vapor and water will cause the high flow velocity as well as the severe variations of temperature and pressure [5]. These factors will seriously affect the efficiency and safety of the unit.…”

Section: Introductionmentioning

confidence: 99%

Evaporation characteristics and efficient working area of multi-stage high pressure and temperature reducing valve

Cao

Dong

et al. 2022

THERM SCI

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A well understanding on the evaporation characteristics and efficient working area of MSHPTRV (multi-stage high pressure and temperature reducing valve) is important for improving the performance and safety of MSHPTRV. The water spraying and evaporation model are integrated into the flow model of MSHPTRV. Compared with the experimental data, the model can show the thermal process well. The flow characteristics and interaction between steam and droplets are presented. On this basis, the increase rate of entropy Sdis is adopted to analyze the thermodynamic loss and innovatively determine the efficient working area of MSHPTRV. The results show that the pressure reducing effect of the second orifice plate is prominent, which accounts for 41.6% of the total pressure drop. The "steam-water layer" is formed at the boundary of steam and water. At the inlet of second orifice plate, the maximum Sdis is 0.782, and the downstream of second orifice plate is the efficient working area of MSHPTRV. The length of evaporation section increases with the droplets diameter significantly.

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Influence of a circular strainer on unsteady flow behavior in steam turbine control valves

Cited by 19 publications

References 16 publications

Eksergijska analiza ventila tlaka pare kod pomorskoga porivnog postrojenja na konvencionalnom LNG tankeru

Eksergijska analiza ventila tlaka pare kod pomorskoga porivnog postrojenja na konvencionalnom LNG tankeru

Numerical and Experimental Investigation of the Conjugate Heat Transfer for a High-Pressure Pneumatic Control Valve Assembly

Evaporation characteristics and efficient working area of multi-stage high pressure and temperature reducing valve

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