Abstract
The installations of CO2 capture from flue gases using chemical absorption
require a supply of large amounts of heat into the system. The most common
heating medium is steam extracted from the cycle, which results in a
decrease in the power unit efficiency. The use of heat needed for the
desorption process from another source could be an option for this
configuration. The paper presents an application of gas-air systems for
the generation of extra amounts of energy and heat. Gas-air systems,
referred to as the air bottoming cycle (ABC), are composed of a gas
turbine powered by natural gas, air compressor and air turbine coupled to
the system by means of a heat exchanger. Example configurations of gas-air
systems are presented. The efficiency and power values, as well as heat
fluxes of the systems under consideration are determined. For comparison
purposes, the results of modelling a system consisting of a gas turbine
and a regenerative exchanger are presented.
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