Utilization of heat recovered from compressed gases in an oxy-combustion power unit to power the Organic Rankine Cycle module

Janusz Kotowicz, Marcin Job, Łukasz Bartela, Mateusz Brzęczek, Anna Skorek-Osikowska


Oxy-combustion technology is a zero-emission technology with great potential for commercial use in the near
future. Application of this technology is linked with high energy losses in oxygen production and preparation of
captured CO2 for transport to a storage place. In the analyzed oxy-combustion power plant with cryogenic air
separation unit the compression of gases is responsible for most of the energy consumption. Compressed gases
are sources of significant amounts of waste heat energy. Effective use of this energy is crucial to reducing the
efficiency drop caused by additional installations. One method extensively examined in the literature for effective
utilization of medium-grade and low-grade waste heat energy is the application of the Organic Rankine Cycle
(ORC), which uses a low-boiling medium to produce additional electric power. The paper presents the results of
analyses of the use of heat recovered from three sources identified in the oxy-combustion unit to power the ORC
module. This includes heat from gases in the compression installations within the air separation unit, the CO2
processing unit and the CO2 compression installation. Thermodynamic and economic analyses were performed
to assess the potential investment.


oxy-combustion; gas compression; waste heat; heat recovery; Organic Rankine Cycle

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