Sulfur-iodine cycle heat sources

Liberatore et al. [11] detail the state of the art for a thermochemical cycle producing hydrogen on the basis of the sulfur-iodine cycle using a planning calculation for a plant with a productirai rate of 100 t/day. As a source of heat and power, a combination of parabolic thermal collectors and heliostats with a central receiver is used. An economic viability analysis resulted in hydrogen costs of 8.30 /kg. 

A recent screening of several hundred possible reactions (Besenbruch et al 2001) has identified two candidate thermochemical cycles for hydrogen production from water (i.e., cycles that enable chemical reactions to take place at high temperatures) with high potential for efficiency and practical applicability to nuclear heat sources. These are the sulfur-iodine (S-I) and calcium-bromine-iron (Ca-Br) cycles. Also, Argonne National Laboratory (ANL) has identified the copper-chlorine (Cu-Cl) thermochemical cycle for this purpose (Doctor et al 2002). A hybrid sulfur-based process that does not require iodine but has a single electrochemical... 

The sulfur-iodine (S-I) cycle is a thermochemical water-splitting process that utilizes thermal energy from a high-temperature heat source to produce hydrogen (H2). It is comprised of three coupled chemical reactions, as shown in figure 4.1. First, the central low-temperature Bunsen reaction (Section I) is employed to produce two... 

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