The possibility to directly use solid biomass in small plants for electricity generation has several advantages compared with usual solutions which typically need large sizes and/or complex fuel processing treatments. The University of Pisa, jointly with some local manufacturers, has designed, built and tested an externally fired micro gas turbine (EFMGT) supplying 75kW of electricity from the direct use of solid biomasses, as well as 200-250kW of useful heat for local thermal users. In several applications, the heat available can’t be usefully exploited in the neighbourhoods of the plant, while electricity from biomass is strongly subsidized in several European electricity markets. The heat available would be enough for generating up to 30kW more electricity through an Organic Rankine Cycle system, which is a convenient solution, reducing the overall specific cost and increasing the electricity generation. Based on these considerations a project has been funded by the Tuscany Region administration for investigating the technical feasibility of the solution and building a pilot unit. The technical solution includes a smaller ORC system which adds some 14kW to the electricity generation. The paper will present the tests of the operation of the ORC system alone and together with the EFMGT
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