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THERMAL COUPLING OF COMPUTATIONAL FLUID DYNAMICS WITH ADVANCED PROCESS SIMULATION SOFTWARE TO MODEL HEAT EXCHANGERS FOR UTILITY BOILERS

DOI: 10.1615/ICHMT.2008.CHT.620
12 pages

Nuray Kayakol
Bosch Sanayi ve Ticaret A.S. Diesel Systems / Engineering Injectors Nozzles Organize Sanayi Bolgesi

Bernd Epple
Energy Systems and Technology, Darmstadt University of Technology, Petersenstr. 30, D-64287 Darmstadt, Germany

Abstract

This paper presents the thermal coupling of Computational Fluid Dynamics (CFD) models with a Heat Exchanger (HEX) model for the detailed simulation of the reheater which is a tube bundle located in the convection chamber of an ultra super critical boiler. A 1250 MW utility boiler is simulated with a CFD code, ESTOS, for coal combustion. The reheater is modeled by using APROS, which is a simulation software product for full-scale modelling and dynamic simulation of industrial processes. Porous media approach for the modeling of tube bundles in CFD simulation is chosen due to complex geometry of tube bundles. A coupling interface which makes data manipulation is developed for the transfer of the shared data from 1D to 3D domains between the codes. Two steps static coupling is done so that each code runs separately but exchange data between them. The CFD code provides uniform flue gas channel temperature for the APROS, which produces non-uniform heat source terms to be added to the energy equation of the ESTOS. Therefore, with this procedure more realistic temperature profile in the convection chamber and wall temperature over the tube bundles can be obtained.

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