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Figure 24. Nässjö combined heat and power plant process. The Nässjö power plant has a 2-stage flue gas condensing. The burning air to the boiler is moisturised with warm water from the flue gas condensing. Moisturised burning air gives a possibility to control the burning temperature better. Flue gas condensing in Nässjö is divided into two stages to increase its flexibility. With full load at the condensing stage (32 MW fuel with 48 % moisture and 45°C return water temperature) the flue gas condensing gives 6.6 MW extra heat. [Svensson, 2002] In addition to the CFB boiler there are three oil fired boilers, which can produce up to 32 MW heat during the CFB boiler shut downs and cold winter periods. The hot water accumulator tank can hold up to 3000 m3 water in the storage, which increases the possibilities to optimise the load of the boiler. The plant is totally automated and it is allowed to operate 16 hours without operating personal, so the power plant is usually manned only during daytime. [Svensson, 2002] Because of the corrosion problems caused by biofuels, a new steel material was experimented in Nässjö and is now in use in the superheaters. The same material is used also in superheaters at Idbäcksverket power plant. In Nässjö power plant other tests to find best materials for different heat exchanger tubes are continuing. [Svensson, 2002] The Nässjö power plant has tried to burn fly ash from the nearby biomass fired grate boiler in the 1995. The ash contained 30 to 40 % of moisture and 25 to 40 % (dry) of unburned carbon. Ash replaced 1 to 2 % of the fuel energy input. Burning the ash reduced NOx emissions and fuel costs. The tests for burning the biomass fly ash were successful, but the fly ash hasn't been burned on the regular basis. [Svensson, 2002] 61PDF Image | Small-scale biomass CHP Finland Denmark and Sweden
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