PERFORMACES ANALISYS BASED ON EXPERIMENTAL CAMPAIGN OF A MICRO CHP PLANT WITH MICROGAS TURBINE SUPPLIED BY WOOD CHIPS

摘要

Once the installation, the commissioning and the preliminary tests have been completed, the Bio_MGTplant was finally started up successfully and it has been running for some thousands of operation hours. TheBio_MGT plant is a micro CHP plant based on a commercial Micro Gas Turbine (MGT, 100 kW) modified to makeit suitable for an externally fired cycle. The system is characterized by a dual combustion configuration and itsupplies electric and thermal power exploiting, as primary energy, woody biomass chips without pre-treatment. Eneffect, a significant share of the total energy input (more than 60%) comes from solid biomass that feeds a biomassfurnace and the thermal energy is transferred to working fluid (MGT compressed air) through an high temperatureheat exchanger; the remaining primary energy is provided by natural gas internal combustion. In this case the plantworks on “hybrid” mode, however the plant can run also on “full green” (without natural gas contribution) mode andthis configuration has been investigated as well. The Bio_MGT plant was designed as prototype plant and it wasequipped with several measurements instruments devices so that the main thermodynamic values of each section ofthe plant can be monitored and analyzed. This paper reports the more interesting data collected along several long runtests (one year of plant monitoring) summarizing the performance obtained up to now, for both configuration mode:“hybrid” mode and “full green” mode. Finally, the experimental results have been compared with numerical resultsobtained by an in house developed code. The code was designed to develop the system and, in the last period, after awide field data collection, the code has been tuned to match the numerical results with the experimental. From nowon the code will able to calculate, with high reliability, the reachable performances of system by changing some ofmain plant control parameters, so that to drive the next develop steps of the Bio_MGT system.