By Marcello De Falco, Angelo Basile
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Additional info for Enriched Methane: The First Step Towards the Hydrogen Economy
Moreover, since the excess of thermal energy must be stored to be used during periods of low insolation, it was necessary to further increase the solar ﬁeld foreseeing three strings of collectors. Fig. 8 Simpliﬁed scheme of the METISOL plant. The low- and high-temperature storage vessels work, respectively, at 290 and 550 °C 48 G. Caputo et al. Fig. 9 String of six solar collectors connected in series The thermal power collected from the solar ﬁeld, with an average radiation of 800 W/m2, is about 5400 kW, of this, approximately 60 % is used by the system of production, while the remaining 40 % is accumulated to extend the production during periods of insufﬁcient solar radiation.
The maximum thermal energy that can be collected by the solar ﬁeld is limited by the capacity of the storage system. If the solar ﬁeld collects an excess energy that cannot be used or stored, the control system of the plant has to discard a part of the available solar energy defocusing the collectors. The capacity of a thermal storage system, Thermal Energy Storage (TES), is normally deﬁned as the hours of operation of the plant at the nominal power without sunshine. 5 h was ﬁxed as a reasonable requirement.
A more extended analysis of yearly data shows that the integration with external energy ranges between 100 and 25 % according to the normal variation of solar irradiation during the year. 7 Conclusions The METISOL project had the aim of developing technological solutions for the production of methane–hydrogen mixtures, for use as motor fuel, through the process of steam reforming of natural gas, using the heat supplied by a concentrating solar plant at high temperature. On the basis of the required production of 50 G.