Carbon Capture and Storage
Chapter 6: Oxy-fuel Combustion Capture Technology
Published:29 Nov 2019
Special Collection: 2019 ebook collection , ECCC Environmental eBooks 1968-2022Series: Energy and Environment
R. P. Cabral and N. Mac Dowell, in Carbon Capture and Storage, ed. M. Bui and N. Mac Dowell, The Royal Society of Chemistry, 2019, ch. 6, pp. 168-188.
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This chapter discusses oxy-fuel combustion for the capture and subsequent sequestration of carbon dioxide. Technologies for oxygen production based on air separation will be presented and the need to reduce energy consumption of these units will be discussed along with some potential strategies. A pulverized coal-fired power plant and a natural gas combined cycle will be analysed as case studies for oxy-combustion and the benefits of using pure oxygen will be discussed as well as how the changes in the thermodynamic properties affect boiler operation. Purification of carbon dioxide in the resulting flue gas to pipeline transport specifications will end the discussion of this chapter with two examples of gas processing units. The parasitic power consumption of this gas processing unit combined with the air separation unit reduces the net efficiency of the plant even though the thermal efficiency is increased, which emphasises the importance of developing new technologies, such as ion transport membranes for oxygen production. The possibility to reduce the energy consumption of both air separation unit and gas processing unit combined with the increased combustion efficiency by using pure oxygen make this a promising technology for carbon capture and storage.