Marcin Job

The influence of carbon capture and compression unit on the characteristics of ultramodern combined cycle power plant

In this paper, the influence of carbon capture and compression unit on the characteristics of ultramodern combined cycle power plant is presented. The chemical absorption of the CO2 from the flue gases using MEA in the carbon capture unit was used. The effective use of heat recovered from the turbine blade cooling air in order to increase the efficiency of combined cycle power plant with the carbon capture and compression unit is proposed. The power plant is analysed in a wide range of compression ratios and temperatures in the gas turbine. Thermodynamic and ecological characteristics of this combined cycle unit as a function of the basic operating parameters are made. The equation connecting the efficiency of combined cycle power plant with and without the carbon capture and compression unit is proposed. The calculations indicate that the reduction of energy consumption of the absorbent by 1 MJ/kgCO2 causes an increase in net electric efficiency of the unit by 1.25 percentage points. The analysed combined cycle power plants are characterised by the highest electricity generation efficiency achievable for large energy units and exceptionally low CO2 emissions, lower than 41 kg/MWh throughout the analysed range of compression ratio.

The improvement of environmental characteristics of the combined cycle power plant by the implementation of the carbon capture installation

The paper describes a combined cycle power plant with carbon capture installation in a post-combustion technology. Carbon dioxide is separated from flue gas by using a chemical absorption method with monoethanolamine (MEA) as a sorbent. Separated carbon dioxide is compressed in order to prepare for transportation to the storage place. This paper identifies the electric efficiencies and other characteristic parameters of power plants before and after implementation of CO2 capture installation, as well as the power plant efficiency drop, and the improvement of ecological characteristics related to the implementation of this installation. The implementation of the installation described herein is associated with the efficiency loss caused by the auxiliary power for additional installations. The CO2 separation installation is powered by heat energy required for reclaiming the sorbent. This energy is taken in the form of steam extracted from the steam cycle, thus reducing the steam turbine power output, while the CO2 compression installation is powered by electric energy.