Public document with technical details of the Brescia demo plant (waste heat from EAF fumes) and the Kremsmünster case study (solar thermal plant).
A waste heat recovery plant has been developed for a steel mill owned by ORI MARTIN and located in Brescia (Italy), to recover the waste heat form the fumes coming from the Electric Arc Furnace (EAF). A 10 MWth Waste Heat recovery Unit has been developed in order to produce saturated steam. The steam can be used for heat production and supply to the city district heating network by means of steam/water heat exchagners (10MWth) or to feed the ORC unit to produce electricity (1,8MWe), which is the operation strategy followed in summer time. The present document comprises a comprehensive description of the developed concept and implemented pilot plant.
The project has worked in a second different system concept based on industrial integration of solar thermal energy in combination with seasonal thermal energy storage (STES) concept, including the possibility of solar heat delivery also to the district heating network. The plant has been planned for a specific site in the city of Kremsmünster (Austria) and in an industrial area of an oil and gas industry. The developed system concept is formed by a solar field of 9377 m2, which is expected to produce around 4547MWh of useful solar heat per year. The idea of reconverting an existing oil tank of 60000 m3 of storage volume (that will not longer be used) into a STES allows to store the surplus solar heat in summer and its use later on in winter months, which significantly increase the solar production capabilities, system performance as well as economics.