Ž. Uldinskas “Low grade heat recovery technology and analysis for a biofuel plant” doctoral dissertation defence

Author, Institution: Žilvinas Uldinskas, Kaunas University of Technology

Science area, field of science: Technological Sciences, Energetics and Power Engineering, T006

Scientific Supervisor: Prof. Dr. Vytautas Dagilis (Kaunas University of Technology, Technological Sciences, Energetics and Power Engineering, T006)

Dissertation Defence Board of Energetics and Power Engineering Science Field:
Habil. Dr. Algirdas Kaliatka (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering, T006) – chairperson
Habil. Dr. Vytautas Martinaitis (Vilnius Gediminas Technical University, Technological Sciences, Energetics and Power Engineering, T006)
Dr. Nerijus Pedišius (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering, T006)
Dr. Giedrė Streckienė (Vilnius Gediminas Technical University, Technological Sciences, Energetics and Power Engineering, T006)
Dr. Nerijus Striūgas (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering, T006)

Dissertation defence meeting was at M7 Hall at The Campus Library of Kaunas University of Technology (Studentų 48–M7, 51367, Kaunas).

The doctoral dissertation is available at the library of Kaunas University of Technology (K. Donelaičio g. 20, Kaunas).

Annotation:

The biofuel, analyzed in the dissertation (wet wood chips as a source of energy production) is already widely and efficiently (using flue gas condensing economizers) used in heat and power stations. However the aforementioned condensing economizers are also today’s limit that needs to be crossed in order to make energy production even more efficient. Therefore, increasing the efficiency of energy production cannot do without the introduction of new technologies in existing energy production systems that are able to use waste heat (specifically, smoke that is emitted into the atmosphere through a chimney). The paper reviews various options for waste heat utilization – heat transformation machines, regenerators, heat pumps. Heat pumps are the most developed technology, which is used to analyze how much waste heat can be additionally recovered by cooling biofuel flue gas below its dew point (after the condensing economizer). To achieve the aims of this study, the calculation algorithm for biofuel smoke cooling is presented, which defines the amount of waste heat to be recovered. Additionally, an additional flue gas cooling system is proposed (using novel heat exchanger) together with an evaluation of its efficiency (technical and economic).