scholarly journals Correction of Error due to Camera Vibrating During Detecting Steam Leakage by Using Image

2014 ◽  
Vol 24 (10) ◽  
pp. 795-801
Author(s):  
Young-Chul Choi ◽  
Hyeong-Seop Jeon ◽  
Ki-Sung Son ◽  
Jong Won Park
Keyword(s):  
Steam Leakage

Air–steam leakage through cracks in concrete walls

2007 ◽  
Vol 237 (15-17) ◽  
pp. 1786-1794 ◽  
Author(s):  
H. Simon ◽  
G. Nahas ◽  
N. Coulon
Keyword(s):  
Concrete Walls ◽  
Steam Leakage

Advanced Labyrinth Seals for Steam Turbine Generators

2006 ◽  
Author(s):  
Ahmad D. Vakili ◽  
Abraham J. Meganathan ◽  
Sricharan Ayyalasomayajula ◽  
Stephen Hesler ◽  
Lewis Shuster
Keyword(s):  
High Performance ◽  
Internal Flow ◽  
Life Time ◽  
Labyrinth Seal ◽  
Two Dimensional ◽  
Steam Turbines ◽  
Labyrinth Seals ◽  
Turbine Generators ◽  
High Performance Composite ◽  
Steam Leakage

A new class of knives (C-Shaped) for reduced labyrinth seal discharge has been designed and assessed through two dimensional numerical modeling of the seal’s internal flow passages. Modeling procedures used for the analysis have been previously validated by comparison with static labyrinth seal experiments. The objectives of the new seal are to: 1) reduce flow leakage through the seal and 2) introduce structural flexibility in the knives so that design clearances could be maintained even after rub events during startup. The baseline chosen for comparative evaluation is an N2 packing used in GE steam turbines. The new seals have compliant C-shaped knives instead of the straight knives, found in an N2 packing. The best performing configuration has one tall ‘C’ shaped long knife and three ‘C’ shaped short knives in each stage. It was found that the best configuration at clearances similar to the baseline seal reduces flow leakage by 42%. Two dimensional numerical structural analyses showed that the new seal knife is more flexible than a straight knife. This is also intuitive by virtue of its geometric profile. A non-dimensional geometric parameter correlates with the degree of flexibility in the knife. These results indicate a potential for design of labyrinth seals that maintain lower design clearances throughout their life time by carefully selecting the knives’ geometric parameters and incorporating high performance composite materials. Then, the new design would result in significantly lower steam leakage.

Wear Prediction of Strip Seals Through Conductance

2004 ◽  
Author(s):  
Farshad Ghasripoor ◽  
Norman A. Turnquist ◽  
Mark Kowalczyk ◽  
Bernard Couture
Keyword(s):  
Thermal Conductivity ◽  
High Speed ◽  
Wear Behavior ◽  
Close Correlation ◽  
Labyrinth Seal ◽  
The Body ◽  
Minor Effect ◽  
Labyrinth Seals ◽  
Steam Leakage ◽  
A Minor

Labyrinth seal assemblies are often used to reduce gas and/or steam leakage in turbines. Caulked-in continuous strip seals are one of the common forms of seals employed on both the rotating and stationary components of turbines. Labyrinth seals perform best when minimum clearances are achieved during the steady state operation of the turbine. However, the design of the turbine and its operation during transient periods of start-up, shut-down and hot re-start often result in interference between the seal components. In the case of the strip seals, this leads primarily to wear of the strip, which in effect adds to leakage. The aim of this paper is to show that strip tip heating and melting during the rub is the main mechanism of wear in the strip. Hence thermal conductivity through the strip and into the body mass in which it is caulked is the primary controlling factor in seal wear. This paper will discuss the use of thermal conductivity and geometry of the strip in predicting wear during high speed rubs against a proprietary material. A close correlation between calculated and experimental strip seal wear data with a number of seal alloys will be demonstrated. Test data will indicate that material properties such as tensile strength and hardness have a minor effect on the wear behavior of continuous seal elements during high-speed rubs.

Steam leakage reduction with carbon rings

World Pumps ◽  
2017 ◽  
Vol 2017 (3) ◽  
pp. 32-33
Author(s):  
Peter Zanini
Keyword(s):  
Leakage Reduction ◽  
Steam Leakage

The Analytical Approach to the Temperature Prediction of Steam Turbine Shells Based on the Thermocouple Temperature Measurements at a Few Points

2008 ◽  
Author(s):  
Ajit B. Ekbote ◽  
Howard M. Brilliant
Keyword(s):  
Steam Turbine ◽  
Temperature Measurements ◽  
Fe Model ◽  
Start Up ◽  
Shell Temperature ◽  
Secondary Steam ◽  
Steam Leakage ◽  
Thermocouple Temperature ◽  
Symmetrical Points ◽  
Continuous Temperature

The performance and efficiency of a steam turbine does depend upon the clearances during the hot conditions. The reliability and accuracy of the clearance calculations is based upon how good are the temperature predictions of the local zones at the secondary steam leakage path. Especially during the transients of the start-up and shutdown of a turbine, the temperature gradients result in the differential expansions of the shell at the top and bottom. This causes the humping or sagging of the shell. Along with the shell, the stationary parts fixed to the shell, such as diaphragms also move up or down. This increases the probability of interference and rubs. These transient gradients are not, in general, captured in the conventional analyses owing to a plethora of reasons. The methods described in this paper are applicable to any section of a steam turbine, as well as a gas turbine. The authors have considered the double flow low pressure (LP) steam turbine inner casing, for which the field data in terms of the metal temperature measurement was compiled and made available. The LP section of a turbine with bottom condenser has, generally double flow arrangement. The thermocouples put on the geometrically symmetrical points indicated difference in temperature and thus the circumferential variation. The paper describes how a few temperature measurements on the shell using thermocouples can be effectively utilized to calculate the temperature as a boundary condition at all the nodes of the finite element (FE) model by means of shape function interpolation. The results based on this technique give a continuous temperature distribution. The thermocouple based shell temperature measurements in the field are used for the calculations of the temperature at each point and the structural analysis was carried out. The analysis did indicate the sagging & humping of the shell. Plans for future improvements will be presented. Temperature and deflection profiles and transient errors are shown to be representative of observed behavior.

scholarly journals Steam Turbine Stage Modernisation in Front of the Extraction Point

2018 ◽  
Vol 25 (2) ◽  
pp. 116-122
Author(s):  
Mariusz Szymaniak
Keyword(s):  
Heat Exchanger ◽  
Steam Turbine ◽  
Power Plants ◽  
Steam Flow ◽  
Numerical Analyses ◽  
Leakage Flow ◽  
Turbine Stage ◽  
Special Ring ◽  
Steam Leakage

Abstract The paper presents modernisation of the steam turbine stage situated in front of the turbine extraction point, based on a 225 MW turbine LP stage as an example. The modernised design is intended to better control the steam flow in this area. In the presented design a special ring is used to drive the steam leakage flow directly to the heat exchanger. The performed experiments and numerical analyses confirmed measurable exploitation and efficiency advantages of the introduced modernisation. So far, it has been successfully applied in a number of turbines working in inland power plants, but its use can be easily extended, without need for further modification and without advantage loss, to marine turbines, especially those used as main propulsion in sea-going vessels.

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