Community Research and Development Information Service - CORDIS

Abstract

Based on the work of the different partners, the project provides a comparison of different biomass co-utilization concepts with regard to fouling, slagging, corrosion, ash utilization and trace emissions. In detail the project incorporated biofuels like wood, wood pulp, bark, straw, wood matter from pressed olive stones and sewage sludge.

The major operational problems like slagging, fouling and corrosion were investigated in both PF and FB units of various scales. Further on, emphasis was put on the subsequent emissions and their minimization of the problematic species of HCl and of the trace organic compounds like dioxins and furans, PCBs and VOCs. The detailed laboratory scale studies of biomass/coal co-combustion were used to validate mathematical modelling techniques. Finally the effect of co-combustion on the by-product management - handling, utilization and disposal have been evaluated and compared with a pure coal or pure biomass combustion system, respectively. As a further approach to avoid the above problems of co-utilization the pretreatment of biomass to remove the undesired components before combustion has been investigated by washing, pyrolysis or gasification prior to combustion. The potential of utilization the gaseous product from pyrolysis or gasification as reburn fuel for NO reduction was evaluated.

As the final result of the project the phenomenical and fuel dependent restrictions of co-combustion have been determined and solutions for the prevention of operational problems and the reduction of hazardous effects on the environment are provided in order to propose the best suitable and most economical technique.

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