RD ON COAL AND WOODY BIOMASS CO-FIRING TECHNOLOGY FOR ELECTRIC POWER UTILITIES IN JAPAN

摘要

To reduce CO{sub}2 greenhouse gas emissions and secure stable energy, the Chugoku Electric Power Co., Inc., Hitachi Ltd. and Babcock-Hitachi K.K. have been co-operating on an R&D project looking into coal and woody biomass co-firing technology for utilization in both Pulverized Coal and Fluidized Bed firing utilities under subsidy of the government as an entrusted task of New Energy and Industrial Technology Development Organization (NEDO) from March 2002 to December 2003. All parties have, for this R&D project, been involved in 'Technological investigations for woody biomass', 'Development of fuel preparation technologies', 'Combustion tests and evaluations' and 'Feasibility studies for actual utilization' with a view to developing biomass conversion and creating an economical energy for this resource in existing coal fired power plants. The final goal in this project is to combust woody biomass at approximately 5-10% of the mixing rate, maintain stable plant operations, satisfy current environmental regulations and keep power generation efficiency at approximately 40% that of the latest coal-fired power plants. Continued from last year's paper, this paper describes combustion test results using a pilot scale test facility and their results are reported as a final edition. Also based on these results, proper fuel preparation (storage, crushing and drying), burner concepts and fuel supply systems have been proposed from feasibility studies for actual utilization. Demonstration tests using an actual power station of 75-175MW class boilers are presently being planned.