Co-production of hydrogen and electricity

different processes (steam reforming, autothermal reforming, partial oxidation, gasification) are available and commercially mature for hydrogen production from natural gas or coal. These processes would have to be combined with technologies for C02 capture and storage (CCS), to keep the emissions profile low. A power plant that combines electricity and hydrogen production can be more efficient than retrofitted C02 separation systems for conventional power plants. 

The use of hydrogen for electric energy production from fossil fuels in large centralised plants will contribute positively to achieve important reductions of C02 

4 Several studies have looked in detail at the concept of co-generation of electricity and hydrogen, e.g., Chiesa et al. (2005) Kreutz et al. (2005) IE/IPTS, (2005) Yamashita and Barreto (2003), as well as the EU R D project Dynamis (www. dynamis-hypogen. com). 

Within such a plant, depending on the pressure of the syngas, the separation can be performed by chemical absorption (usually with amine solvents) under lower pressure conditions or by physical absorption (e.g., with methanol) under higher pressure conditions (see also Chapter 6). Likewise, pressure-swing absorption can be employed. With the special properties of hydrogen, membrane separation processes could also be a very promising solution for the separation task. 

5 An important aspect of electrolysers is also that they can, in principle, follow the load curve of fluctuating energy production capacities without any time delay (owing to the electrochemical process). 

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Starr, F., Tzimas, E. and Peteves, S. (2007). Critical factors in the design, operation and economics of coal gasification plants the case of the flexible co-production of hydrogen and electricity. International Journal of Hydrogen Energy, 32 (10-11), 1477-1485. 

The plant concept for co-production of hydrogen and electricity is applicable to a very broad range of fossil fuels and also biomass without paying tributes to climate change. At the same time energy supply security is improved, as a result of the diversification of (fossil) feedstock options. 

FIGURE 9.22 Layout for a gasification-based system for co-production of hydrogen and electrical power while sequestering C02 [51]. Reprinted with permission from Elsevier. 

A combined procedure for the co-production of hydrogen and electricity from water splitting and coal has been proposed with the following reaction system... 

Manzolini G, Viganb F (2009) Co-production of hydrogen and electricity from autothermal reforming of natural gas by means of Pd-Ag membranes. Energy Procedia 1 319-326... 

Mitlitsky F (2009) Low-cost co-production of hydrogen and electricity. Annual Merit Review, www. hydrogen.energy.gov/pdfs/review09/fc 46 mitlitsky. pd. Accessed 20 Aug 2014... 

Chiesa, P., Consonni, S., Kreutz, T. and Williams, R. (2005). Co-production of hydrogen, electricity and C02 from coal with commercially ready technology part A performance and emissions. International Journal of Hydrogen Energy, 30 (7), 747-767. 

Chiesa P, Consonni S, Kreutz T, WUliams RH (2(X)5) Co-production of hydrogen, electricity, and CO2 from coal with commercially ready technology. Part A performance and emissions. Int J Hydrogen Energy 30 747-767... 

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