Dynamic Instabilities in Natural-Circulation Evaporators of Vertical HRSGs PUBLIC ACCESS

[+] Author Affiliations
Klaus Payrhuber, Hermann Halozan

Graz University of Technology, Graz, Austria

Paper No. 97-GT-324, pp. V002T08A008; 7 pages
  • ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations
  • Orlando, Florida, USA, June 2–5, 1997
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7869-9
  • Copyright © 1997 by ASME


Dynamic instabilities become increasingly one of the design criteria for natural-circulation evaporators in Heat Recovery Steam Generators (HRSGs) of combined cycle power plants, especially in systems with a vertical gas duct. To calculate such instabilities, the computer program DEDYN is being developed. The calculation method has been presented at the ASME Cogen-Turbo Power 1995 in Vienna (Payrhuber, 1995).

This publication deals with modeling of a natural-circulation evaporator. The evaporator investigated in this paper consists of 340 parallel finned tubes in 4 layers of 16 meters (total tube length of one tube is 64 meters) and a total heat transfer surface of 16400 square meters. This heat exchanger bundle of a HRSG with a vertical duct is divided in 8 sub-ducts, which permits a calculation with local heating medium (= flue gas) temperatures. The inlet and outlet headers of this bundle are connected to a drum.

Several variations have been investigated like changing the operation pressure, different heights of the drum, subcooling when entering the downcomer, as well as parallel flow or counter flow through the evaporator tube bundle. The paper shows the boundary conditions for preventing or at least damping mass flow oscillations in the evaporator.

Copyright © 1997 by ASME
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