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Sandvik II (figure 23) has a Foster Wheeler's CFB boiler. The fuel used in the boiler is a mixture of wood chips and bark (80 %) and peat (20 %). The flue gas temperature after the CFB boiler is between 800 and 900°C and the steam values are 540°C, 142 bar and 43 kg/s. Sandvik II has a high and low pressure turbine by ABB Stahl. The turbines give 10 730 r/min and 6 950 r/min, respectfully. Generator is made by ABB Industrial Systems and gives 1 500 r/min. The electricity production of Sandvik II is 38 MWe and the district heat production is 66 MW. [Sandberg, 2002] In Sandvik II the sulphur emissions are lowered with calcium injection into the bed. Nitrogen oxide emissions are controlled with ammonium injection into the top of the furnace and with a catalysator after the economiser. Particles are removed in an electrostatic precipitator. After the flue gas cleaning the flue gases are condensed and an additional 10 to 20 MW heat is produced. Fly ash from the electrostatic precipitator is used as a fertiliser in forest lands and the bottom ash is utilised as land construction material. [Sandberg, 2002] Sandvik I 1. Biomass fired boiler 2. Steam turbine 3. Condenser 4. Generator District heat process 5. District heat accumulator 6. Cooler 7. Oil fired boiler 8. Biomass fired boiler 9. Flue gas condensing of biomass boiler 10. Electricity boiler 11. District heat pumps 12. Expansion tank Sandvik II 15. Steam turbine 16. Generator 17. Conderser 18. Flue gas condensing 19. Biomass fired CFB boiler Figure 22. The combined process of Sandvik I and II. [Växjö Energi AB, 2001] 58PDF Image | Small-scale biomass CHP Finland Denmark and Sweden
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