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• W4308045297 abstract "• Carbon dioxide separation from exhaust gases can be applied to internal combustion engine sources • Waste heat can be used to drive the separation process • CO 2 capture rates of 20-80% are achievable considering only the available exhaust heat • Higher exhaust CO 2 concentrations require less specific energy, but greater total energy • The capture rate can be determined from the exhaust temperature and CO 2 concentration • The concept can be used to achieve accelerate decarbonization of many applications This work explores the potential for use of carbon dioxide separation processes, colloquially known as carbon capture, to accelerate decarbonization of the transport sector. Thermal swing absorption processes using an aqueous CO 2 -selective solvent provide an efficient means of separating CO 2 from other exhaust gas constituents. Amine-based solvents–well known from acid gas treating and other post-combustion carbon capture processes–are highly selective, have a fast rate of reaction with CO 2 , and can use waste heat to drive the separation process. This work demonstrates how amine-based processes can be deployed for carbon removal from a generic exhaust gas source produced by an internal combustion engine (ICE) using waste heat in the exhaust. It includes an estimation of the exhaust enthalpy-limited capture rate for various sources considering the capture system performance, the CO 2 concentration, and the exhaust temperature. CO 2 capture rates of around 25-80% are shown to be thermodynamically feasible for various ICE applications using waste exhaust heat for solvent regeneration. Rates of around 15-50% are attainable without providing additional energy, if exhaust heat is also used to power the capture system pump and compressor. Although a higher exhaust CO 2 concentration reduces the specific energy requirements of the separation process, the total energy required for a given capture rate increases due to the greater amount of CO 2 removed. Thus, maximum capture rates are highest for applications with high exhaust temperature and low CO 2 concentration (such as diesel generators), and lowest for applications with very low exhaust temperature such as ships. This analysis also shows that the potential for CO 2 avoidance using carbon capture systems far exceeds that of organic rankine cycle waste heat recovery systems. Overall, expanding the use of carbon capture to ICE applications can provide an efficient means of utilizing waste exhaust heat while providing significant reductions in the energy industry's scope 3 greenhouse gas emissions." @default.
• W4308045297 created "2022-11-07" @default.
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• W4308045297 date "2022-12-01" @default.
• W4308045297 modified "2023-10-04" @default.
• W4308045297 title "Evaluating the thermodynamic potential for carbon capture from internal combustion engines" @default.
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• W4308045297 doi "https://doi.org/10.1016/j.treng.2022.100144" @default.
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