Hydrogen-Rich Biomass Gasification System as an Example of Exergy Enhancement of Low Quality Waste Heat

Abstract

The excergy regeneration from low quality energy sources combined with various chemical reaction processes is the potential option to realize a highly sophisticated new energy system. This new concept can be realized based on material conversion processes closely related to multi-pass energy recycling among electric, chemical, and thermal energy sources. In order to realize future excergy regeneration systems and their further optimization, we especially focus on the excergy enhancement from low temperature (100-300ºC) heat sources including waste steam. Here, as an example, we propose excergy regeneration system based on hydrogen-rich biomass gasification with self-heat recirculation. The possibility of realizing this system was evaluated by using Aspen Plus software combined with our experimental data for each component. This process could be further improved with the combination of various chemical reactions such as fuel cell and methanol and DME syntheses.