TY - JOUR
TI - Low grade heat recovery system for woodfuel cogeneration plant using water vapour regeneration
AU - Dagilis Vytautas
AU - Vaitkus Liutauras
AU - Balčius Algimantas
AU - Gudzinskas Juozas
AU - Lukoševičius Valdas
JN - Thermal Science
PY - 2018
VL - 22
IS - 6
SP - 2667
EP - 2677
PT - Article
AB - The paper analyses low grade heat recovery problem for modern woodfuel  cogeneration plant. The woodfuel flue gas, behind the condensing economizer,  still contains a considerable amount of heat, main part of which is the  latent one. To recover this low grade heat, the heat pump technology can be  used, which is related with additional consumption of energy (electric,  mechanical or heat). Another technique that could be applied is a heat  regeneration when flue gas heat, mostly latent, is transmitted to air blown  towards burning chamber. Therefore, the analysed heat recovery system  operates mainly like mass regenerator which contains only blowers that use  some electric energy. The regenerator consists of two cyclically operating  columns with packing material. Energetic analysis demonstrates that 13% of  additional heat can be produced utilizing this low grade heat. The economic  valuation shows that investment in a heat recovery system is quite  effective; the payback time is about 4 years.