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110 IPCC Special Report on Carbon dioxide Capture and Storage Figure 3.2 General schemes of the main separation processes relevant for CO2 capture. The gas removed in the separation may be CO2, H2 or O2. In Figures 3.2b and 3.2c one of the separated gas streams (A and B) is a concentrated stream of CO2, H2 or O2 and the other is a gas stream with all the remaining gases in the original gas (A+B). preferentially separate H2 from a fuel gas stream, CO2 from a range of process streams or O2 from air with the separated O2 subsequently aiding the production of a highly concentrated CO2 stream. Although membrane separation finds many current commercial applications in industry (some of a large scale, like CO2 separation from natural gas) they have not yet been applied for the large scale and demanding conditions in terms of reliability and low-cost required for CO2 capture systems. A large worldwide R&D effort is in progress aimed at the manufacture of more suitable membrane materials for CO2 capture in large-scale applications. A gas can be made liquid by a series of compression, cooling and expansion steps. Once in liquid form, the components of the gas can be separated in a distillation column. In the case of air, this operation is currently carried out commercially on a large scale. Oxygen can be separated from air following the scheme of Figure 3.2c and be used in a range of CO2 capture systems (oxy-fuel combustion and pre-combustion capture). As in the previous paragraphs, the key issue for these systems is the large flow of oxygen required. Refrigerated separation can also be used to separate CO2 from other gases. It can be used to separate impurities from relatively high purity CO2 streams, for example, from oxy-fuel combustion and for CO2 removal from natural gas or synthesis gas that has undergone a shift conversion of CO to CO2. 3.1.4 Application of CO2 capture The CO2 capture systems shown in Figure 3.1 can be cross- referenced with the different separation technologies of Figure 3.2, resulting in a capture toolbox. Table 3.1 gives an overview of both current and emerging technologies in this toolbox. In the next sections of this chapter a more detailed description of all these technological options will be given, with more emphasis on the most developed technologies for which the CO2 capture cost can be estimated most reliably. These leading commercial options are shown in bold in Table 3.1. An overview of the diverse range of emerging options being investigated worldwide for CO2 capture applications will also be provided. All of these options are aimed at more efficient and lower cost CO2-capture systems (compared with the leading options). It is important 3.1.3.3 Distillation of a liquefied gas stream and refrigerated separationPDF Image | CARBON DIOXIDE CAPTURE AND STORAGE
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