High-Pressure Steam Flow in Turbine Bypass Valve System Part 1: Valve Flow

Amano, Ryoichi S.; Draxler, G. R.

doi:10.2514/2.5996

Cited by 13 publications

(8 citation statements)

References 12 publications

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“…Flow analyses for nine paths were performed to determine the relationship between velocity and pressure drop, as shown in equation (1). Steam, which was at 505 • C and 75 bar, was used as the working fluid.…”

Section: Flow Analysismentioning

confidence: 99%

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Design of a tortuous path trim for a high-pressure turbine bypass valve

Kwon

Kim

Park

et al. 2010

Proceedings of the Institution of Mechanical Engineers, Part E:

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This article describes the design and performance testing of a turbine bypass valve trim. For effective control of velocity and pressure, a trim designed to have a tortuous path was designed. Computational fluid dynamics and FEM analyses were used in the design process. The valve, which was installed the designed trim, was tested. To evaluate its performance in the field, the valve was installed at a 900 MW combined power plant system for three months. The results showed that the pressure letdown was successfully controlled by the designed trim, and the noise level was reduced by about 8.1 per cent compared with the previous trim-type valve.

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Section: Flow Analysismentioning

confidence: 99%

“…To calculate the valve flow field, the trim, which had 2700 (54 × 50) possible paths, was modelled as a pressure jump surface using equation (1). The same values from the above cases were used for the steam and the turbulence models.…”

Section: Flow Analysismentioning

confidence: 99%

Design of a tortuous path trim for a high-pressure turbine bypass valve

Kwon

Kim

Park

et al. 2010

Proceedings of the Institution of Mechanical Engineers, Part E:

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show abstract

“…For this reason, the valve is used also to proportionally control the steam mass-flow rate in the plant. As stated by different works in literature [14][15][16][17][18], this kind of construction is robust, reliable and considerably reduces the noise and vibrations associated to the fluid lamination. The lamination process inside this valve can be approximated as an adiabatic, isenthalpic transformation; thus, in order to control the outlet steam temperature, the specific enthalpy of the flow is reduced by mixing the main steam flow with atomized cold water.…”

Section: Introductionmentioning

confidence: 99%

“…19 and in Fig. 20 it's compared the step response of the full non-linear system with the corresponding approximating linearized function: linearized transfer functions (13) (14), seem to be a good approximation of the system behaviour respect to the chosen operating point.…”

Section: Calibration and Identification Of Valve Positioners And Actumentioning

confidence: 99%

“…The other cross term F PT is not null but is not completely negligible, since the lamination process of the DTP valve produce also a variation of the fluid temperature. However, from a quantitative point of view, the two pressure and temperature control loops are highly decoupled and the response of the bypass systems are dominated by the diagonal, direct terms F PP and F TT .which can be approximated by the first order linearized transfer functions (13) and (14). In Fig.…”

Section: Calibration and Identification Of Valve Positioners And Actumentioning

confidence: 99%

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Preliminary design and validation of a Real Time model for hardware in the loop testing of bypass valve actuation system

Pugi

Galardi

Carcasci

et al. 2015

Energy Conversion and Management

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Hardware in the loop Turbine bypass controller a b s t r a c tDuring the start-up and shut-down phases of steam power plants many components are subjected to pressure and temperature transients that have to be carefully regulated both for safety and reliability reasons. For this reason, there is a growing interest in the optimization of turbine bypass controllers and actuators which are mainly used to regulate the plant during this kind of operations. In this work, a numerically efficient model for Real Time (RT) simulation of a steam plant is presented. In particular, a modular Simulink™ library of components such as valves, turbines and heaters has been developed. In this way it is possible to easily assemble and customize models able to simulate different plants and operating scenarios. The code, which is implemented for a fixed, discrete step solver, can be easily compiled for a RT target (such as a Texas Instrument DSP) in order to be executed in Real Time on a low cost industrial hardware. The proposed model has been used for quite innovative applications such as the development of a Hardware In the Loop (HIL) test rig of turbine bypass controllers and valve positioners. Preliminary experimental activities and results of the proposed test rig developed for Velan ABV are introduced and discussed.

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

Wang

Liu

2017

Applied Thermal Engineering

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High-Pressure Steam Flow in Turbine Bypass Valve System Part 1: Valve Flow

Cited by 13 publications

References 12 publications

Design of a tortuous path trim for a high-pressure turbine bypass valve

Design of a tortuous path trim for a high-pressure turbine bypass valve

Preliminary design and validation of a Real Time model for hardware in the loop testing of bypass valve actuation system

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

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