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In this chapter, the main CO₂ capture systems applied to the industrial and power sectors have been described, covering a wide range of TRLs. Chemical absorption as post‐combustion arrangement was further discussed, including advanced process configurations and its integration in the power plant and electricity grid.

Based on the information from the literature, Figure 1.12 aims to provide an overview of the current TRLs of the different CO₂ capture technologies applied to the power and industrial sectors. Note that differences on the TRL definitions from different sources can impact on the TRL assessment. Additionally, several systems can vary and it would be reflected in their TRL. For example, chemical absorption systems have reached their maximum TRL when commercial solvents are used. However, emerging solvents might be at a much lower TRL. Similar limitations of those estimations can be seen, for example, in the use of different absorbents, different types of membranes or using novel O₂ separation process for oxyfuel. Moreover, in the case of the industrial sector, the TRL is also dependent on the industry. For example, while a system has been tested within a cement production facility, it might not have been used in the iron and steel production environment. In addition, in some industries, there could be a wide range of production processes, which impact on the CO₂ emitted and composition of the flue gas, and will be considered when assessing the TRL at the relevant environment.

Figure 1.12 Review of current TRL of different CO₂ capture technologies. *The prediction of the TRL of fuel cells is based on the project implemented in Alabama by ExxonMobil and Fuel Cell Energy partnership using MCFC. **SEWGS = Sorption‐enhanced water gas shift. This prediction is based on the expected outcome of the STEPWISE project. ***The prediction of the calcium looping technology on the industrial sector is based on the expected outcome of the CLEANKER project. ****Oxyfuel is considered here as the combustion with almost pure oxygen. Other configurations of, for example, chemical looping, cryogenics, membranes (oxygen separation), among others, can be considered as part of the oxy‐combustion technologies.