The overall objective is to investigate how to obtain reliable and environmental favorable commercial operation in biomass based FBC systems. The expected results shall
based on experimental findings stipulate recommendations how to repress agglomeration and defluidisation in fluidised bed combustion systems based on experimental findings indicate how to utilize primary measures to minimize or to hold back the
formation of nitrogen oxide compounds in the fluidised bed reactor based on case studies identify optimal logistic strategies in utilizing biofuels in commercial heat and power
A first phase of the project will map a selection of biofuels concerning the thermochemical performance in oxidative atmosphere, separately and in combination with suitable bed materials. Fuels to be considered are straw, MBM (meat and bone meal), Miscanthus, Reed Canary grass, willow and forest fuels. The selection is based on availability but is aimed to reflect medium to high alkali rich biomass fuels, i.e. 10 -20 %-wt (ash basis) total alkali, and their influences on agglomeration. Lab scale experiments via test rig to commercial scale ( I 10MW) experimental investigations will be carried out. Secondly, the programmeaims to study the promotion of the N2O reduction reactions in initial stages and subsequently the reduction of NO through catalytic adsorption on solid reductants. The work will proceed through the construction of a 3D-CFD code to be converted into a "post-processor" implemented on the NO reduction chemistry. In subsequent experimental work, the relative importance of various competing mechanisms will be established in relation to the thermochemical performance of the previously selected fuels, bed materials and operating conditions.
To assess the utilization in a logistic sense, the most promising fuels of the experimental study will be mapped considering existing logistic management, suitable means for transport and handling resulting in optimum logistic concepts for FBC. The ideal number, possible location of FBC plants and the assignment of feedstock source will moreover be determined and documented concentrating on Scandinavia, Great Britain and on mainland Europe. As a conclusive achievement, a handbook will be produced for commercial utilization in FBC systems of the selected biofuels. The combined results from all the work packages be put together into a clear-cut manual
EXPECTED ACHIEVEMENTS AND EXPLOITATION
The expected results from the project work will contribute to increase fuel flexibility of existing and future FBC systems allowing for a broader palette of fuels to be fired without essential technical modifications. A higher technical availability of the plants is expected. In addition, lower operational costs are anticipated due to increased competitiveness of the plant owner on the fuel market.
After completion of the research project, well-tested strategies for optimized combustion of biomass residues, as well as simulation tools (the CFD and the techno-economic simulation tool) and the biomass/emission - database, will be ready immediately. Small and medium enterprises, as well as boiler manufacturers, will have the possibility to use this knowledge and tools to optimize their combustor designs, fuel and operating conditions leading to essential improvements in efficiency, environmental acceptability, and cost.
Funding SchemeCSC - Cost-sharing contracts
NG17 2NS Nottingham
221 00 Lund
NN10 9LU Rushden