The Analysis of Blade Vibrations at a High Pressure Steam Turbine during Thermal Power Plant Start-up Condition

2021 ◽  
Author(s):  
Zulkifli Al Rasyid Sampoerna ◽  
Nu Rhahida Arini ◽  
Achmad Bahrul Ulum
Keyword(s):  
High Pressure ◽  
Power Plant ◽  
Steam Turbine ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
High Pressure Steam ◽  
Start Up ◽  
Pressure Steam ◽  
Blade Vibrations

Measurements of the Leakage Through a High Pressure Steam Turbine Power Plant Gland Seal

2017 ◽  
Author(s):  
Peter Stein ◽  
Dominik Born ◽  
Martin König
Keyword(s):  
High Pressure ◽  
Power Plant ◽  
Steam Turbine ◽  
Real Life ◽  
Test Rig ◽  
High Pressure Steam ◽  
Pressure Steam ◽  
Gland Seal ◽  
Real Plant ◽  
Plant Components

Today’s power market asks for highly efficient turbines which can operate at a maximum flexibility, achieving a high lifetime and all of this on competitive product investments. In line with the demands for reduction of CO2, the machine efficiencies are continuously increased. To further increase efficiencies, deeper insight into the single components is required to better understand the individual contributions to the overall performance. This work focuses on the measurement of leakages through High Pressure Steam Turbine gland sealing. Gland sealing technologies are frequently in focus of research and development activities. Various concepts were and are still developed and proven to work in test rigs. Typically such test rigs form an idealized environment with ideal manufacturing and low tolerances compared to real plant components. For this work real gland sealing components from a power plant were taken, a test rig developed around them and the different leakage path massflow rates determined. The advantage of using real plant components is i.e. in the real life relevance of the gained results by considering real design manufacturing tolerances, surface qualities etc.. By testing numerous gland segments from manufacturing and installing them in different orders, even statistical relevant information may be gained with respect to the influence of manufacturing on the seal tightness. This work presents the development of a test rig around a real plant gland seal and the tested leakages through the various paths of the tested component. The here gained information enables further development and optimization of advanced sealing technologies.

scholarly journals Finite Element Analysis of Bimetallic Layered Pressure Vessel using Ansys

2019 ◽  
Vol 9 (2S2) ◽  
pp. 378-382
Keyword(s):  
High Pressure ◽  
Power Plant ◽  
Pressure Vessel ◽  
Solid Wall ◽  
Thermal Power ◽  
Pressure Vessels ◽  
High Pressure Steam ◽  
Pressure Steam ◽  
Bimetallic Layer ◽  
Paper Work

This paper work discusses about the effect of bimetallic layer on pressure vessel with different heads. The main objective of this paper work is to design and analysis of bimetallic layered pressure vessels using analysis software. In this work analyses about stress concentration factor on bimetallic layer of pressure vessels wall. The pressure vessels are widely used in thermal, chemical industry, nuclear power plant. In thermal power plant or thermal related industry produces the high pressure steam in the pressure vessel, that high pressure steam is induced a stress on the vessel’s wall. So that, the pressure vessel wall is deformed due to high pressure. That deformation is analysis by ANSYS and Theoretical calculation. In this paper two different types of head are used, two different head shape are flat and hemispherical head. The stresses developed in the solid wall pressure vessel and the head of pressure vessel is also analyzed by ANSYS. The theoretical displacement value and ANSYS displacements value of bimetallic layers are compared. Based on the ANSYS analysis the better bimetallic layer is selected for pressure vessels fabrication.

Using CFD to Enhance the Preliminary Design of High-Pressure Steam Turbines

2013 ◽  
Author(s):  
Juri Bellucci ◽  
Federica Sazzini ◽  
Filippo Rubechini ◽  
Andrea Arnone ◽  
Lorenzo Arcangeli ◽  
...  
Keyword(s):  
High Pressure ◽  
Steam Turbine ◽  
Design Tool ◽  
Tip Clearance ◽  
Large Set ◽  
Preliminary Design ◽  
Steam Turbines ◽  
High Pressure Steam ◽  
Wide Range ◽  
Pressure Steam

This paper focuses on the use of the CFD for improving a steam turbine preliminary design tool. Three-dimensional RANS analyses were carried out in order to independently investigate the effects of profile, secondary flow and tip clearance losses, on the efficiency of two high-pressure steam turbine stages. The parametric study included geometrical features such as stagger angle, aspect ratio and radius ratio, and was conducted for a wide range of flow coefficients to cover the whole operating envelope. The results are reported in terms of stage performance curves, enthalpy loss coefficients and span-wise distribution of the blade-to-blade exit angles. A detailed discussion of these results is provided in order to highlight the different aerodynamic behavior of the two geometries. Once the analysis was concluded, the tuning of a preliminary steam turbine design tool was carried out, based on a correlative approach. Due to the lack of a large set of experimental data, the information obtained from the post-processing of the CFD computations were applied to update the current correlations, in order to improve the accuracy of the efficiency evaluation for both stages. Finally, the predictions of the tuned preliminary design tool were compared with the results of the CFD computations, in terms of stage efficiency, in a broad range of flow coefficients and in different real machine layouts.

CFD Investigation on the Rotordynamic Characteristics of Shroud Leakage Flow in High Pressure Steam Turbine

2013 ◽  
Author(s):  
Noriyo Nishijima ◽  
Akira Endo ◽  
Kazuyuki Yamaguchi
Keyword(s):  
High Pressure ◽  
Steam Turbine ◽  
Mass Flow ◽  
Guide Vane ◽  
Flow Distribution ◽  
Labyrinth Seal ◽  
High Pressure Steam ◽  
Cfd Models ◽  
Pressure Steam ◽  
The Difference

We conducted a computational fluid dynamics (CFD) study to investigate the rotordynamic characteristics of the shroud labyrinth seal of a high-pressure steam turbine. Four different CFD models were constructed to investigate the appropriate modeling approach for evaluating the seal force of an actual steam turbine because shroud seals are generally short with fewer fins and the effect of surrounding flow field is thought to be large. The four models are a full model consisting of a 1-stage stator/rotor cascade and a labyrinth seal over the rotor shroud, a guide-vane model to simulate the condition similar to seal element experiments, and two other simplified models. The calculated stiffness coefficients of the four models did not agree and fell into two groups. Through careful investigations of flow fields, it was found that the difference could be explained by the circumferential mass flow distribution at the seal inlet and the mass flow bias rate is an important factor in evaluating the seal force of a turbine shroud. The results also indicate that the rotordynamic characteristics obtained from seal element experiments may differ from those of actual turbines, especially in short seals.

THE LIFE ASSESSMENT OF STEAM TURBINE ROTORS FOR FOSSIL POWER PLANTS

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4371-4376
Author(s):  
SUNGHO CHANG ◽  
GEEWOOK SONG ◽  
BUMSHIN KIM ◽  
JUNGSEB HYUN ◽  
JEONGSOO HA
Keyword(s):  
Power Plant ◽  
Steam Turbine ◽  
Rotational Speed ◽  
Power Plants ◽  
Thermal Power ◽  
Creep Damage ◽  
Life Assessment ◽  
Life Extension ◽  
Start Up ◽  
Operational Life

The operational mode of thermal power plants has been changed from base load to duty cycle. From the changeover, fossil power plants cannot avoid frequent thermal transient states, for example, start up and stop, which results in thermal fatigue damage at the heavy section components. The rotor is the highest capital cost component in a steam turbine and requires long outage for replacing with a new one. For an optimized power plant operational life, inspection management of the rotor is necessary. It is known in general that the start-up and shutdown operations greatly affect the steam turbine life. The start-up operational condition is especially severe because of the rapid temperature and rotational speed increase, which causes damage and reduction of life of the main components life of the steam turbine. The start-up stress of a rotor which is directly related to life is composed of thermal and rotational stresses. The thermal stress is due to the variation of steam flow temperature and rotational stress is due to the rotational speed of the turbine. In this paper, the analysis method for the start-up stress of a rotor is proposed, which considers simultaneously temperature and rotational speed transition, and includes a case study regarding a 500MW fossil power plant steam turbine rotor. Also, the method of quantitative damage estimation for fatigue-creep damage to operational conditions, is described. The method can be applied to find weak points for fatigue-creep damage. Using the method, total life consumption can be obtained, and can be also be used for determining future operational modes and life extension of old fossil power units.

Optimization of a High-Pressure Steam Turbine Stage for a Wide Flow Coefficient Range

2012 ◽  
Author(s):  
Juri Bellucci ◽  
Filippo Rubechini ◽  
Andrea Arnone ◽  
Lorenzo Arcangeli ◽  
Nicola Maceli ◽  
...  
Keyword(s):  
High Pressure ◽  
Steam Turbine ◽  
Operating Conditions ◽  
Flow Coefficient ◽  
Low Flow ◽  
Turbine Stage ◽  
Aerodynamic Optimization ◽  
High Pressure Steam ◽  
Wide Range ◽  
Pressure Steam

In this paper a multi-objective, aerodynamic optimization of a high-pressure steam turbine stage is presented. The overall optimization strategy relies on a neural-network-based approach, aimed at maximizing the stage’s efficiency, while at the same time increasing the stage loading. The stage under investigation is composed of prismatic blades, usually employed in a repeating stage environment and in a wide range of operating conditions. For this reason, two different optimizations are carried out, at high and low flow coefficients. The optimized geometries are chosen taking into account aerodynamic constraints, such as limitation of the pressure recovery in the uncovered part of the suction side, as well as mechanical constraints, such as root tensile stress and dynamic behavior. As a result, an optimum airfoil is selected and its performance are characterized over the whole range of operating conditions. Parallel to the numerical activity, both optimized and original geometries are tested in a linear cascade, and experimental results are available for comparison purposes in terms of loading distributions and loss coefficients. Comparisons between measurements and calculations are presented and discussed for a number of incidence angles and expansion ratios.

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