University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal

Logo BOKU Resarch Portal

Gewählte Master / Diploma Thesis:

Michael Kressl (2012): Co-combustion of torrified biomass with coal for energy generation..
Master / Diploma Thesis - Institut für Holzforschung (IHF), BOKU-Universität für Bodenkultur, pp 58. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
The world wide increasing demand for renewable energy sources is leading to the development of new technologies. Co-firing of coal with biomass is a promising process to cover the lack of fossil fuels in the future and to mitigate global climate change. A thermal pretreatment method called torrefaction can be used to improve biomass properties for co-firing. This study investigates the co-combustion characteristics of torrefied biomass blends with coal. Radiata pine chips were torrefied at 250°C and 300°C for 30 min of residence time under 100% nitrogen atmosphere. Two subbituminous chilean coals called Isla Riesco and Tocopilla were mixed with the untreated and torrefied biomass to blends of 20:80 and 50:50 in ratio. The separate combustion of the materials and their blends were studied by non-isothermal thermogravimetric analysis from ambient to 1100°C with a temperature increase of 5K/min. Characteristic temperatures and maximal conversion as combustion parameters were analyzed for the evaluation of the combustion characteristics. Differences in the combustion characteristics were identified through torrefaction and a possible improvement of the co-combustion profil with the low reactive Tocopilla coal was detected. The experimental weight loss of the blends did not match with the calculated theoretical TG-curves of the individual materials, showing a synergistic effect of coal combustion with torrefied and untreated biomass.

Beurteilende(r): Teischinger Alfred

© BOKU Wien Imprint