In the last years significant efforts have taken place or are in progress, for the evaluation of the biomass thermal utilisation potential, as it is a cheap and technically feasible option to contribute to reducing the net CO2 emissions. For this purpose the combined combustion of several coal types and various biomass materials (straw, wood chips, sawdust, olive stones) in different combustion systems and methods was investigated. In this article the co-combustion trials of Lignite and Wood matter from pressed oil-stone (WPOS) attained in two different installations, of laboratory and large-scale respectively, will be presented. Specifically, these trials were carried out in the lab-scale fluidised bed of the Laboratory of Steam Boilers and Thermal Plants of NTUA (National Technical University in Athens) and the Units I and II at the Megalopolis Power Plant of PPC (Public Power Corporation).

The aim of the co-combustion trials was to investigate all these parameters which contribute to the best solution foundation concerning the following subjects:

During the pyrolysis and co-combustion trials the following were measured and examined for different WPOS percentages in the fuel blend:

The conclusions derived from this research would turn out to be valuable not only for WPOS use as supporting of lignite but also for other biomass materials that could be burnt in PPC’s Thermal Plants, considering that all the necessary construction modifications are possible.

Keywords : Wood matter from pressed oil-stone, co-combustion, volatile release, emissions, ash deposition, fouling, slagging