Feature : Distri ct energy Laimonas Kučinskas, Director of Technical and Production Department and Donalda Pilatkienė Marketing Manager inside the manufacturing and assembly hall. more efficient operation, a unique feature according Bioenergy International Internat ional No 81, 5-2015 11 to Enerstena. The stainless steel economiser is a shell and tube heat exchanger of condensing type. – When using stainless steel economisers, heat production can be substantially increased with the combustion of the same amount of fuel in the boiler. Due to deep cooling of the flue gas and the condensation of water vapour the economiser recovers up to 20–30 percent of additional heat, said Rinkevičius. The higher the moisture content of the fuel, the higher performance of the economiser. This is due to a large portion of the combustion heat used to evaporate moisture from the fuel being recovered. Condensate clean-up Before excess condensate from the condenser can be discharged to the municipal wastewater treatment system it needs to be pre-treated to remove particles and adjust the pH. Firstly the pH is adjusted, by adding an acid or alkaline solution, to pH 6.5-6.8. After neutralisation, a coagulant agent is added to coagulate small particles into larger ones. The coagulated particles are then flocculated using a flocculent agent, preparing the condensate for filtration to remove the particles. This is achieved by using a laminar flow filter “Lamella” designed by Enerstena. To maintain the uninterrupted operation of the condensing system, and to increase the heat transfer efficiency, the treated and filtered condensate is recirculated back into the system with only the excess discharged. This eliminates the need to use additional cold water in the condensate treatment system. Text & photos: Alan Sherrard BI81/4935/AS Facts: Enerstena Founded in 2002 Enerstena Group is one of the largest energy companies in the Baltic countries. The group consists of four companies, that between them cover the design and manufacture of biomass boilers, flue gas condensers, furnaces and other technological equipment for biomass boiler plants, consultancy and trade of industrial equipment for energy and industrial objects, process automation and finally provides heat services to the town of Alytus. Facts: Kauno Energija Founded in 1963 and owned by the city of Kaunas, AB Kauno Energija has a total installed capacity (2014) of 496.08 MW thermal and 8.75 MW electric. Serving over 111 000 household consumers and 3 500 businesses and organisations in Kaunas city and region, it supplies heat, hot-water and electricity. The company maintains and operates over 405 km of district heat networks. Can it be used as fuel, how does it perform are the sort of questions that get answered by Jolita Mockuvienė, Head of Fuel Laboratory and Quality Manager and Nerijus Rinkevičius, Vice Director, Enerstena Research & Development Center.
Bioenergy no 5 September 2015
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