127677 20241125101157.0 doi 10.1016/j.renene.2023.05.100 sideral 134751 ART-2023-134751 eng Usón, Sergio Universidad de Zaragoza (orcid)0000-0002-9279-1959 Integration of thermoelectric generators in a biomass boiler: Experimental tests and study of ash deposition effect 2023 Access copy available to the general public Unrestricted Thermoelectric generators (TEGs) are based on Seebeck effect and produce electricity from a heat flow. They require low maintenance and provide quiet operation. However, they have low efficiency and need suitable temperature values. Accordingly, the integration of TEGs in boilers is a promising approach, since these equipment present high temperature differences between hot gases and water and allows the use of waste heat for water heating. There are experiences of the integration of TEGs in biomass boilers, but almost none with unconventional biomass with a high tendency to ash deposition. The integration of TEG modules in a commercial pellet-fired 25 kWth boiler is described and experimental results, working with pine pellets and with an agropellet (70% of vineyard pruning and 30% of barley straw), are presented. Power produced with only 6 modules can reach 60 W. After quantifying the effect of the temperature on both gas and water sides, the study focuses on analyzing the ash deposition on the exchange surfaces and their effect on TEG modules operation (e.g. power reduction of 0.24 W per hour with pine and 0.78 with agropellet). This effect can be minimized by working with high excess of air or by integrating a cleaning system. info:eu-repo/grantAgreement/ES/MICIU/RTI2018-098886-A-I00 info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 9.0 2023 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY 16 / 91 = 0.176 2023 Q1 T1 ENERGY & FUELS 24 / 171 = 0.14 2023 Q1 T1 1.923 2023 Renewable Energy, Sustainability and the Environment 2023 Q1 18.4 2023 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Royo, Javier Universidad de Zaragoza (orcid)0000-0003-4631-6994 Canalís, Paula Universidad de Zaragoza (orcid)0000-0002-5037-7047 5004 545 Universidad de Zaragoza Dpto. Ingeniería Mecánica Área Ingeniería Mecánica 5004 590 Universidad de Zaragoza Dpto. Ingeniería Mecánica Área Máquinas y Motores Térmi. 214 (2023), 395-406 Renew. energy Renewable Energy 0960-1481 4676537 http://zaguan.unizar.es/record/127677/files/texto_completo.pdf Versión publicada 2573097 http://zaguan.unizar.es/record/127677/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:127677 articulos driver 2024-11-22-12:09:42 ARTICLE