Analysis Of The Complementary Energy Losses Of
A High Temperature Gas To Gas Heat Exchanger
Based On A Solid Intermediate Medium
Author(s)
L. A. Catalano, R. Amirante, P. Tamburrano & S. Copertino
Abstract
This paper focuses on the analysis of the complementary energy losses of a gas
to gas heat exchanger using an intermediate medium with high thermal capacity
to transfer heat between two gas streams at different pressure. In fact, such a heat
exchanger requires two mechanical devices, namely a pressurization system
capable of transferring the particles from a low pressure to a high pressure
environment, and a depressurization system, for the inverse procedure. The
operating procedures of these two key components are presented in detail and a
simple zero-dimensional approach is also proposed to model both systems. A
numerical analysis, based on the same zero-dimensional model, is performed in
order to evaluate all energy losses related to the pressurization and
depressurization procedures. A further energy loss is analysed, in particular the
one related to the energy absorbed by the conveyor employed to deliver back the
particles from the bottom to the top of the plant in order to realize a continuous
operation mode.
Keywords: gas turbines, external combustion, heat exchanger, particle
pressurization.
1 Introduction
The application of externally fired gas turbines for power generation would offer
the possibility of burning \“dirty” fuels, like coal or orimulsion or biomass, since
the combustion gases are not in direct contact with the moving parts of the
machine in the external combustion operation mode. On the contrary, modern
energy conversion technologies like internal combustion gas turbines demand the
use of clean fuels, which are significantly more expensive. Even if externally
Keywords
gas turbines, external combustion, heat exchanger, particle
pressurization.
Related Book
Other papers in this volume
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