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Admont Plant The Admont CHP plant is located near the sawmill STIA-Holzindustrie GmbH in Admont, Austria. The plant was the first ORC demonstration plant in the European community, with focus on cost-effective operation through combined heat and power production. Another ambition was the reduction of NOX and dust emissions with the use of an SNCR process. The plant was commissioned in 1998 and has an electric capacity of 400 kWel along with a thermal capacity of 2250 kWth. It supplies the Benedictine monastery of Admont and STIA with space heat. In addition it supplies STIA with process heat along with 45 % of their electricity demand. The fuel utilized is solely biomass (saw dust and wood residues) from STIA, [21]. Technology The plant was constructed with two combustion units, one thermal oil boiler and one hot- water boiler, with nominal thermal outputs of 3.2 MWth and 4.0 MWth respectively. The flue gases from the boilers are cleaned in a multi-cyclone before they are fed to a condensation unit with the capacity of 1.5 MWth, [22]. The ORC-unit which was delivered by Turboden s.r.l is connected to the thermal oil boiler and has a nominal capacity of 2.25 MWth, since 0.95 MWth of the total thermal oil power is directly used as process heat by STIA. The ORC-unit runs on a close cycle with a silicon oil as organic working fluid. The pressurised silicon oil is evaporated by the thermal oil and then expanded in a two stage axial turbine which drives a generator. The expanded silicon oil then passes a regenerator for internal recuperation after that the oil is finally condensed in a district heating heat exchanger. The condensed oil pressure is further increased by a pump and returned to the evaporator unit, thus closing the cycle. The process flow sheet is very similar to that shown in Figure 2.1, [21]. The thermal oil boiler covers the basic heat load, yet for peak load conditions the 4 MWth hot water boiler is set into operation. The flue gas from the hot water boiler uses the same condensation unit as for the thermal oil boiler. An illustration of the total plant is shown in Figure 2.5. It should be pointed out that due to technical problems the NOX reducing glue- water injection system have been replaced by adding the glue-water mixture directly in the fuel, [21]. 17PDF Image | Biomass Based Small Scale Combined Heat and Power Tech
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