Optimization of a 900 mm Tilting-Pad Journal Bearing in Large Steam Turbines by Advanced Modeling and Validation

Author:

Mermertas Ümit1,Hagemann Thomas2,Brichart Clément3

Affiliation:

1. Siemens AG Power and Gas Division, Rheinstr. 100, Mülheim an der Ruhr 45478, Germany e-mail:

2. Mem. ASME Institute of Tribology and Energy Conversion Machinery, Clausthal University of Technology, Leibnizstr. 32, Clausthal-Zellerfeld 38678, Germany e-mail:

3. Engie Laborelec, Rodestraat 125, Linkebeek 1630, Belgium e-mail:

Abstract

Modernization of steam turbine components can extend power plant lifetime, decrease maintenance costs, increase service intervals, and improve operational flexibility. However, this can also lead to challenging demands for existing components such as bearings, e.g., due to increased rotor weights. Therefore, a careful design and evaluation process of bearings is of major importance. This paper describes the applied advanced modeling methods and performed validation for the optimization of a novel 900 mm three-pad tilting pad journal bearing that showed high temperature sensitivity to the fresh oil supply temperature. The bearing was developed to cope with increased rotor weights within the low pressure (LP) steam turbine modernization at two 1000 MW nuclear power plants. With a static load of 2.7 MN at a speed of 1500 rpm, it represents one of the highest loaded applications for tilting pad bearings in turbomachinery worldwide. After identification of the reasons for the sensitivity, advanced modeling methods were applied to optimize the bearing. For this purpose, a more comprehensive bearing model was developed considering the direct lubrication at the leading pad edge and pad deformation. The results of the entire analyses indicated modifications of bearing clearances, pad length, thickness, and pivot position. The optimized bearing was then implemented on both units and proved its excellent operational behavior at increased fresh oil supply temperatures of up to 55 °C. In conclusion, the application of advanced modeling methods proved to be the key success factor in the optimization of this bearing, which represents an optimal solution for turbomachinery.

Publisher

ASME International

Subject

Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering

Reference21 articles.

1. Operating Conditions of Multi-Lobe Journal Bearings Under High Thermal Loads;ASME J. Tribol.,1990

2. He, M., 2003, “Thermoelastohydrodynamic Analysis of Fluid Film Journal Bearings,” Ph.D. thesis, University of Virginia, Charlottesville, VA.

3. Thermohydrodynamic Analysis of Tilting-Pad Journal Bearings Operating in Turbulent Flow Regime;ASME J. Tribol.,1996

4. A Generalized Reynolds Equation for Fluid Film Lubrication;Int. J. Mech. Sci.,1962

5. Cavitation Formation and Modeling for Fluid Film Bearings: A Review;Proc. IMechE: J. Eng. Tribol.,2010

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