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8. Process descriptions of some biomass CHP plants in Sweden 8.1 Myresjöhus, Vattenfall AB, 2 MWe 8.1.1 Process description The Myresjöhus combined heat and power plant produces electricity for a sawmill and heat for heating and wood drying. The power plant is constructed in the 1994 and it is owned and operated by Vattenfall. During the maximum load conditions the power plant produces about 2 MWe electricity and 4.9 MW heat. The electricity production covers about one third of the electricity needed at the sawmill. Only during the cold winter nights the electricity is sold outside the sawmill to the grid. [Arnstedt, 2002] Myresjöhus uses the residues of the sawmill, mainly sawdust and bark, as fuel. The costs of the wood fuels are between 80 and 90 SEK/MWh (9 to 10 EUR/MWh) for the wet fuel. Sawdust is burned in a 10 MW grate boiler. The process scheme of Myresjöhus is presented in figure 21. The burning air is preheated first with heating water and then with steam from the economizer. The air is fed as a primary and secondary air to the combustion chamber. [Arnstedt, 2002] Figure 21. Myresjöhus power plant process. The flue gas temperature after the grate boiler and before the heat exchangers is about 1100°C. The steam is superheated to the temperature of 470°C. The pressure of the superheated steam is from 50 to 60 bar and the mass flow 2.8 kg/s. The superheated 56PDF Image | Small-scale biomass CHP Finland Denmark and Sweden
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