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4.5.2 Process description The main fuels are peat (both milled and sod peat are used) and wood residues. Heavy fuel oil is used as a backup and start-up fuel. Milled peat is dryed in a flash dryer which uses hot sand from the BFB boiler as heat source. The dryer is developed and patented by Fortum Oyj. The drying takes place in a vertical tube. The milled peat and sand from the boiler are conveyed through the dryer by circulating steam. After the dryer, peat and sand are separated from the steam and are led back to the boiler. The steam is led to a condenser which is connected to district heat network. The heating power of the fuel dryer is 3.5 MW. Before the dryer, the moist content of the fuel is typically 40 – 60% and after drying 8 – 20%. Fuel is burned in a bubbling fluidized bed boiler supplied by FosterWheeler. The live steam flow is 8 kg/s, temperature of the superheated steam is 510°C and pressure 61 bar. After the boiler the steam is led into a single case high-speed (12 000 r/s) steam turbine running an 1500 r/s generator. After the turbine is one district heat exchanger and district heat temperatures normally 50/87.5°C. The turbine has one extraction for feedwater tank. The feedwater temperature before the boiler is 105°C. An electrostatic precipitator is used for flue gas cleaning. Normally the district heating system is used in series so that the main heat exchanger (after the turbine) is first and the heat exchanger of the peat dryer is second. If the need for higher district heat temperature is higher than 95°C, the order of the heat exchangers is changed in order to maximize the electric power output of the plant. Drying section of the plant is not in utilisation currently. Summary Electricity: District heat: Electrical efficiency: Power-to-heat ratio: Overall efficiency: Fuel input: Fuels: Boiler: Steam values: Emission control: Crew: Start up year: 6.1 MWe 17.5 MWdh (21,2 with dryer) 0.22 0.35 86% 27.6 MW milled peat, sod peat, wood residue bubbling fluidised bed 8 kg/s, 510°C, 61 bar electrostatic precipitator 1 + 1 daytime 1994 33PDF Image | Small-scale biomass CHP Finland Denmark and Sweden
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