Mathematical Models Of Air-cooled Condensers
For Thermoelectric Units
Author(s)
S. Bracco, O. Caligaris & A. Trucco
Abstract
The present paper deals with the use of air-cooled condensers in thermoelectric
units, such as steam power plants or combined cycle units. The paper describes
the main features of air-cooled condensers, showing the problems related to their
use, such as the presence of non-condensable gases inside the steam flow or the
condenser performances variability due to ambient conditions. The present study
refers to A-frame air-cooled condensers characterized by single-pass and
multiple-row arrangement. A phenomenological study has been done in order to
calculate the main physical parameters which describe the condenser operating
conditions. In particular, three mathematical models have been developed: while
both the first and the second model consider a condenser with tubes
characterized by the same finned surface, with or without the use of throttling
valves upstream of each tube, the third model examines the behaviour of a
condenser with different row effectiveness. The three mathematical models
permit one also to investigate the possible vapour back flow inside each row of
tubes, by calculating the axial coordinate value along each tube at which the
condensing steam mass flow rate becomes null; the third mathematical model
has been implemented in the Matlab/Simulink environment in order to couple the
simulator of the condenser with the whole plant simulation model.
Keywords: air-cooled condenser, non-condensable gases, simulation model.
Keywords
air-cooled condenser, non-condensable gases, simulation model
Related Book
Other papers in this volume
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