Objective Objectives In comparison to other renewable energy sources, thermal utilization of biomass or waste is a cheap and technically feasible option to reduce net CO2 emissions. Co-combustion of biomass or waste with coal in existing large-scale firing systems offers several advantages compared with systems exclusively fired with biomass. Use of biomass or waste, however, may have consequences on combustion behaviour, emissions, corrosion, and residual matter. Based on previous experience, the objective of this project is to concentrate the research effort on the problem areas of slagging, fouling, corrosion, ash utilization and trace emissions by testing different co-combustion systems and to investigate technical options to avoid these negative effects. Solution of these problems will promote a widespread use of existing biomass resources. Technical approach Two different concepts will be compared with regard to fouling, slagging, corrosion, ash utilization and trace emissions. The first and cheapest possibility is direct co-combustion using coal and biomass as feedstock in a coal-fired boiler. Here the effects of co-combustion of different kinds of biomass on slagging, fouling, and corrosion will be considered. The effects of co-utilization on the ash composition have also to be evaluated and compared to a pure coal or biomass combustion system. The combustion concepts under consideration will be fluidized bed combustion, pulverized fuel combustion, and the slagging combustor. A further approach is to pre-treat the biomass to remove the undesired components before combustion. One way could be a pyrolysis/ gasification process and the use of the produced gas in a different boiler. The gas can be used as reburn fuel for NOx reduction. A maximum gas yield being advantageous, not only pyrolysis but also gasification has to be considered. If the yield of the remaining char is too high, treatment and combustion of the ash has to be taken into account. Expected Achievements and Exploitation The effects of different kinds of biomass on operation, emissions and residuals and the economics of the different co-combustion concepts will be shown. This will make it possible to define the most suitable technique. The limits of co-combustion will be identified and measures to prevent operational problems and to reduce environmental effects will be outlined. The results can then be transferred to industrial application; they will enable designers and operators of combustion plant to minimize the operational and environmental impact of plant burning blends of coal and biomass. The resulting information will allow development of new plant designs that offer better control of boiler operation with an associated improvement in environmental performance. Fields of science engineering and technologyenvironmental engineeringenergy and fuelsrenewable energysocial scienceseconomics and businesseconomicsengineering and technologyenvironmental engineeringenergy and fuelsfossil energycoalagricultural sciencesagricultural biotechnologybiomass Programme(s) FP4-NNE-JOULE C - Specific programme for research and technological development, including demonstration in the field of non-nuclear energy, 1994-1998 Topic(s) 0305 - Energy from biomass and waste Call for proposal Data not available Funding Scheme CSC - Cost-sharing contracts Coordinator UNIVERSITAET STUTTGART EU contribution No data Address Pfaffenwaldring 23 70569 STUTTGART Germany See on map Total cost No data Participants (13) Sort alphabetically Sort by EU Contribution Expand all Collapse all AABO AKADEMI UNIVERSITY Finland EU contribution No data Address 14-18B,Lemminkäinengatan 14-18 B 20500 TURKU / ABO See on map Total cost No data CRE GROUP LTD. United Kingdom EU contribution No data Address Stoke Orchard GL52 4RZ Cheltenham See on map Total cost No data Centre d'Etudes et Recherches des Charbonnages de France (CERCHAR) France EU contribution No data Address 33 Rue de la Baume 75008 Paris See on map Total cost No data ELSAMPROJEKT A/S Denmark EU contribution No data Address 53,Kraftvaerksvej 53 7000 FREDERICIA See on map Total cost No data IMPERIAL COLLEGE OF SCIENCE, TECHNOLOGY AND MEDICINE United Kingdom EU contribution No data Address Prince Consort Road SW7 2AZ LONDON See on map Total cost No data IMPERIAL COLLEGE OF SCIENCE, TECHNOLOGY AND MEDICINE United Kingdom EU contribution No data Address Exhibition Road SW7 2BX LONDON See on map Total cost No data Labor für Materialprüfung und -analyse GmbH Germany EU contribution No data Address 12,Ernst-Thälmann-Strasse 04425 Plaussig - Leipzig See on map Total cost No data Lurgi Lentjes Babcock Energietechnik GmbH Germany EU contribution No data Address 5,Lurgi-Allee 60295 Frankfurt-am-Main See on map Total cost No data National Technical University of Athens Greece EU contribution No data Address 42,Patission Street 10682 Athens See on map Total cost No data Studsvik Material AB Sweden EU contribution No data Address 611 82 Nyköping See on map Total cost No data TECHNICAL UNIVERSITY OF DENMARK Denmark EU contribution No data Address 229,Building 229 2800 LYNGBY See on map Total cost No data TPS TERMISKA PROCESSER AB Sweden EU contribution No data Address Studsvik 611 82 Nyköping See on map Total cost No data Vattenfall AB Sweden EU contribution No data Address 162 87 Stockholm See on map Total cost No data