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CASE STUDY ON BIOMASS ENERGY TECHNOLOGIES (BETS) 1. Location: Gornji Grad, Slovenia 2. Plant Name: ENGO d.o.o. 3. Year of Installation: 1998, the 2nd phase of DH net is in construction 4. Capacity of the plant: 2 biomass fired boilers of 2 MW each (total 4 MW) 5. Description of the process: Gornji Grad is a small town in the mountains north east of Ljubljana. The town has around 800 inhabitants. There are around 250 apartments and individual homes, various public buildings, industries, enter-prises and sports centres and leisure centres serving the growing tourism. The district heating plant was designed to supply approximate 220 buildings: 200 households, 20 larger buildings and wood-working industry Smreka with hot water and space heating. The town is situated in the upper Dreta Valley at around 500 m above sea level. The valley is densely forested and offers very good conditions for all kinds of use of wood. One industry utilising this vast amount of wood resources is the factory SMREKA. SMREKA is the largest industry of Gornji Grad. It produces prefabricated houses, garden houses, doors and other timber products. SMREKA exports over 80% of its products and employs 117 full-time employees, of whom almost every-body live in Gornji Grad. SMREKA is the major consumer of heat and continuous process heat for the wood kilns. The wood waste from the fabric can easily be used as a resource to produce heat. In Gornji Grad, the heat demand stems from both small and large consumers. The smaller consumers are the individual households, whereas the large consumers include SMREKA and municipal buildings. The heat demand from the smaller consumers is estimated by using the key figure of 180 kWh per m2 per year. The large consumers are evaluated individually on the basis of the existing heat supply. There are 226 individual households in the town itself. It was projected that 199 of these households would be connected to the district heating network. The heat demand for these houses was estimated to a total of 8,775 MWh per year. SMREKA is estimated to have an annual consumption of 2,250 MWh per year. The other large consumers are estimated to 3,465 MWh per year with a further expansion to 7.680 MWh per year in 2004. The heat loss is estimated to approximately 20%. With temperatures on a daily basis for a reference year, it is now possible to calculate the heat load duration curve. SMREKA's consumption is estimated to be 80% process heating and 20% space heating. For the other large consumers, ie office buildings etc, it is estimated that 88% is space heating and the rest hot water. On the heat load duration curve, SMREKA's space heat demand is included in large consumers. The duration curve shows a maximum heat load of 8 MW. From this curve it would seem reasonable to install a biofuelled boiler with a capacity of 4-5 MW. 4 MW was chosen and because the project is divided in phases, two boilers of 2 MW were installed. It gives a greater flexibility and an important duplication factorPDF Image | Organisations in Different Renewables
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