Objectives and problems to be solved:
The primary technical objective of the project is to establish the feasibility to use a broad range of biomass and waste materials and possible mixtures as fuel in FBC installations (fuel flexibility), minimising at the same time strain on the environment through optimised operating conditions. Guidelines and recommendations for a reliable operation, a mathematical model and a software tool should be developed addressing the key issues like bed agglomeration, fouling type deposits, heat transfer, ash deposition and utilisation, emission of pollutants, and logistic processes. All this is supposed to contribute to a wide enforcement of biomass to energy conversion systems by improving the cost-effectiveness and competitiveness as well as to reduction of greenhouse gas emissions, strain on environment, and waste landfill. Description of work: Experimental and modelling studies are incorporated in the approach as well as commercial scale validation. The following key problems are addressed: Fuel flexibility, compositional characterisation of input and output streams, sintering/ agglomeration of bed and ash material, ash deposition and fouling, emission monitoring, mass and (heavy metal and toxic) elemental balances, commercial application and logistics of the fuels and solid residues. Selected fuels are demolition wood, MBM (meat and bone meal), sewage sludge, grass type fuel, waste tyres and poultry litter. Using the selected fuels and fuel mixtures, a selection of bed materials and additives, experiments are performed in a 20, 350 and 750 kW FBC installation. Based on the results of the small-scale experiments, a selection of tests is performed in a 3 MWth FBC plant and selected trials are eventually validated at commercial application in a 25 MWth and 80 MWth installation. These experiments are accompanied by emission monitoring and determining the composition of fuel, bed material (before and after use), additives, ashes, agglomerates and deposits. The fouling issue (specific to biomass/waste fuels due to alkali content) is additionally tackled by modelling and simulation of the formation of fouling type deposits and heat transfer. A software-tool is developed which enables the planning and comprehensive optimisation of logistic processes consisting of a network of several sub-processes like collection, transport, storage, and pre-treatment steps. This has a considerable impact on the cost-effectiveness of biomass to energy conversion systems. Expected results and exploitation plans:· Guidelines and recommendations on avoiding/mitigating bed agglomeration/ defluidisation and deposition/fouling, and on ash utilisation options. · Software tool "Optimised logistic systems of biomass FBC" for planning and optimisation of logistic systems for biomass/waste to energy installations.· Mathematical model of formation of fouling type deposits and heat transfer.· Several technical reports on the findings and experience from the investigations. Results will be used to determine the prospects of co-firing the selected fuels, to broaden the range of fuels in an existing commercial plant and in another one which is close to completion, to consult European equipment manufacturers, users of installations and biomass/waste suppliers, and for dissemination. The logistics software tool will be provided via internet to potential users (regional planners, plant operators, fuel suppliers).
Funding SchemeCSC - Cost-sharing contracts
GL52 4RZ Cheltenham
1755 ZG Petten
5555 XP Valkenswaard
NN10 9LU Rushden