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Vrije Universiteit Brussel The Vrije University in Brussels is currently developing an EFGT plant of the size 500 kWel (see Figure 2.15). The aim of the project is to demonstrate a CHP plant based on air blown fluidized bed gasifier working together with an EFGT. Thus biomass is first gasified before it is burned in the EFGT gas/gas heat exchanger. The final goal is to develop a commercial plant in the range of 2 to 5 MWel, [34]. Figure 2.15 Gasifier at Vrije University Brussels, [35] Technology The biomass is fed from a fuel silo in to the gasifier at a flow rate of 400 kg/h. The air factor is between 0.25 and 0.3, producing a product gas with a calorific value of 3.5-4 MJ/kg. The bed temperature is about 700°C and the product gas temperature is about 600°C, which is high enough to avoid tar condensation. After passing a cyclone the product gas has a dust content below 500 mg/Nm3. The turbine outlet gas has a temperature of 350°C and is used as combustion air in the main combustor. The flue gases after combustion has a temperature of 900°C and are fed through the gas/gas high temperature heat exchanger which is made of metal. The heat exchanger which is the critical component of the cycle amounts to 10% of the total investment of the plant. The remaining heat in the flue gases are used in a recuperator for district heat productions. A flow sheet is shown in Figure 2.16. Furthermore the plant electrical power and efficiency could theoretically be increased by injecting water in air cycle but this has not been realized yet. A top combustor, where natural gas is combusted to increase the temperature before the turbine has also been considered but not yet realized due to high costs, [35]. 33PDF Image | Biomass Based Small Scale Combined Heat and Power Tech
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