Study of thermal conversion by means of secondary air injection for the elimination of ash in fluid-bed gasifiers and techno-economic assessment regarding other routes (TC2GAS

Summary: In this project, thermal cracking and partial oxidation through the injection of secondary air as an alternative to other routes of tar reduction in the bed, in particular in the catalytic route, were assessed. For this, kinetic data in the literature were selected, as well as those specifically determined in the laboratory scale fluidized bed. Extensive pilot scale experiments were carried out. A semi-empirical kinetic model was designed and integrated into a commercial CFD code to optimize air injection into the gasifier to evaluate different configurations. Finally, with the data collected from the previous activities, a techno-economic study of the various alternatives to tar cleaning which compete with that here proposed was carried out