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Miyazaki Biomass RecycleYokogawa’s CENTUM CS 3000 DCS Monitors and Controls Operations at Poultry Litter-to-energy PlantExecutive SummaryMiyazaki Biomass Recycle (MBR) was established in May 2003 with funding from Nishinippon Environmental EnergyCompany, a subsidiary of Kyushu Electric Power Company, and several poultry farming cooperatives in Kawaminami,Miyazaki. The company built and operates a biomass waste-to-energy plant that helps to dispose of the poultry littergenerated by the farms in the surrounding area. While it earlier had been possible to dispose of all this waste by using it asfertilizer, a significant increase in the amount of generated waste necessitated the construction of this facility. This need wasmade more pressing by a 1999 law that requires livestock breeders to properly dispose of livestock waste.MBR’s plant uses a stoker-type furnace to incinerate the poultry litter. Steam produced using the thermal energy from theincinerator drives a steam turbine and electricity generator with a maximum output of 11,350 kilowatts. The plant is capable of incinerating 440 tons per day of poultry litter. The electricity is sold to Kyushu Electric Power Company and the incinerator ashis sold to fertilizer companies.All operations at this biomass waste-to-energy facility are monitored and controlled using a Yokogawa solution consisting ofthe CENTUM CS 3000 production control system, Exaquantum plant information management system, field instruments, andanalytical instruments.The Challenges and the SolutionsStable operationThe moisture content of the poultry litter varies depending on how it has been stored, the type of poultry house that is used,and the season. The calorific value of the poultry litter depends mainly on the moisture content, and any variation in this leadsto fluctuations in the amount of steam generated by the boiler system. To help maintain a consistent moisture content, thepoultry litter is mixed at the receiving point and when in storage. Any remaining variation in the moisture content is dealt withby adjusting the speed of the conveyers that feed the poultry litter to the furnace. By these means, a constant steam flow rateis maintained.To further optimize the Plant InformationLocation: Miyazaki, JapanCapacity: 11.35 MWFuel: Poultry litterCompletion: 2005Heat generation process flow by poultry litter19Success Story CollectionRenewable EnergyBiomass