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Chemical Processes and Use of CO2

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Chemical Processes and Use of CO2 ( chemical-processes-and-use-co2 )

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3 ENERGY-EFFICIENT PROCESSES Power plant in which CO2 separation occurs after fuel combustion (‘post-combustion capture’) In a conventional fossil fuel power plant, the fossil fuel is burned and the hot flue gases used to create steam that drives a steam turbine that powers a generator creating electricity. The downstream flue gas cleaning stage remo- ves most of the dust, sulphur oxides and nitrogen oxides. If CO2 separation occurs after the flue gas clean-up stage, it is referred to as post-combustion capture (Fig. 80c). Fuel Air Boiler Gas clean-up CO2 capture Fig. 80c: Simplified schematic of an oxy-combustion capture process CO2 The advantage of capturing the CO2 from the flue gas stream after combus- tion and after flue gas cleaning is that it can be added on to existing power plants provided that certain conditions are met. Existing power plants can therefore be retrofitted with this carbon capture technology. Power plants currently under construction or that are in the planning stage need to be designed to be ‘capture ready’ so that they can be converted to incorporate PCC technology. A simplified schematic of the carbon capture and flue gas cleaning process is shown in Figure 80d. Fig. 80d: Schematic illustration of a power plant with post- combustion carbon capture 186

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