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research-article

ANALYTICAL HEAT TRANSFER CORRELATION FOR A MULTISTAGE STEAM TURBINE IN WARM-KEEPING OPERATION WITH AIR

[+] Author and Article Information
Dennis Toebben

Institute for Power Plant Technology, Steam and Gas Turbines, RWTH Aachen University, Templergraben 55, 52064 Aachen, Germany
toebben@ikdg.rwth-aachen.de

Adrian Hellmig

Institute for Power Plant Technology, Steam and Gas Turbines, RWTH Aachen University, Templergraben 55, 52064 Aachen, Germany
adrian.hellmig@web.de

Piotr Luczynski

Institute for Power Plant Technology, Steam and Gas Turbines, RWTH Aachen University, Templergraben 55, 52064 Aachen, Germany
luczynski@ikdg.rwth-aachen.de

Manfred Wirsum

Institute for Power Plant Technology, Steam and Gas Turbines, RWTH Aachen University, Templergraben 55, 52064 Aachen, Germany
wirsum@ikdg.rwth-aachen.de

Wolfgang F. D. Mohr

General Electric (Switzerland) GmbH, Brown Boveri Str. 7, 5401 Baden, Switzerland
wolfgang.mohr@ge.com

Klaus Helbig

General Electric Power AG, Boveristr. 22, 68309 Mannheim, Germany
klaus.helbig@ge.com

1Corresponding author.

ASME doi:10.1115/1.4040717 History: Received June 25, 2018; Revised June 26, 2018

Abstract

Due to the growing share of volatile renewable power generation, conventional power plants with a high flexibility are required. This leads to high thermal stresses inside the heavy components which reduces the lifetime. To improve the ability for fast start-ups, information about the metal temperature inside the rotor and the casing are crucial. Thus, an efficient calculation approach is required which enables the prediction of the temperature distribution in a whole multistage steam turbine. The present paper deals with the theoretical investigation of steam turbine warm-keeping operation with hot air. This operation is totally different from the conventional operation conditions, due to the different working fluid with low mass flow rates and a slow rotation. Based on quasi-steady transient multistage CHT simulations, an analytical heat transfer correlation has been developed, since, the commonly known calculation approaches from literature are not suitable for this case. The presented heat transfer correlations describe the convective heat transfer separately at vane and blade as well as the seal surfaces. The correlations are based on a CHT model of three repetitive steam turbine stages. The simulations show a similar behavior of the Nusselt-number in consecutive stages. Hence, the developed area related heat transfer correlations are independent of the position of the stage. Finally, the correlations are implemented into a solid body Finite-Element model and compared to the fluid-dynamic simulations.

Copyright (c) 2018 by ASME
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