Carbon capture energy processes

Adapted from (Haiduc, A., et al., 2009. SunCHem an integrated process for the hydrothermal production of methane from microalgae and CO2 mitigation. Journal of Applied Phycology 21(5), 529—541 Stucki, S., et al., 2009. Catalytic gasification of algae in supercritical water for biofuel production and carbon capture. Energy Environmental Science 2(5), 535—541). 

This technology shows benefits for carbon capture. Limestone is cheap and widely available, and there is a potential for process integration, which can lead to low energy penalties, i.e., heat released from carbonisation can be utilised in a steam cycle or the heat used in the calciner reactor can be recovered in the carbonation process. 

The combination of a less-constrained ASU for oxygen production and a carbon capture process using membranes instead of amine solvents can conduce to a minimal energy requirement associated with an oxygen purity ranging between 0.5 and 0.6 molar fraction. 

Zeman and Keith (2008) also suggested synthesizing carbon neutral hydrocarbons (CNHCs) from air-captured CO2. This term (in fact CO2 neutral) is inconsistent, and in its place we will use solar fuels to express that the supply of process energy for the chemical reduction of captured CO2 must be based on solar energy processing instead of fossil (geothermal heat is another option). 

Fig. 13.1 Hydrogen in the energy system of the futine [1]. Pie-c

Cormos, C. (2010) Evaluation of iron based chemical looping for hydrogen and electricity co-production by gasification process with carbon capture and storage. International Journal of Hydrogen Energy, 35, 2278-2289. 

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