抄録
The Blue Tower (BT) process has a characteristic of producing the high concentration H2 gas. So far, we have executed some experiments in order to estimate gaseous yields through BT process. In the previous studies, we confirmed that the biomass material such as woody chips (Japanese Cedar etc.) was more adequate for the production of Bio-H2 fuel. However, from the viewpoint of LCA (Life Cycle Assessment) thinking, the specific CO2 emission and energy efficiency of Bio-H2 were 57.0 g-CO2/MJ and 1.14 MJ/MJ, respectively. This implies that the energy input of the auxiliary is affected of fossil fuel origin to much extent. That is, in this process, the improvement of the environmental indexes is to reduce fossil fuel consumption in the plant which is counted as the auxiliary power.
In this study, we proposed the innovative process through CO2 adsorption system. We focused on the adsorbent of “HAS-clay”, which has a characteristic of adsorbing CO2 at the room temperature. Based on the performance data on “HAS-clay”, we compared the environmental indexes of Bio-H2 in the conventional process to ones in the proposed way.
As a result, we estimated that the Bio-H2 production rate was 304.8Nm3/h and the auxiliary power was 180.6 to 202.6 kW, Also, the energy intensity of 0.94-1.01 MJ/MJ-fuel and the CO2 emission of 49.5 to 52.0 g-CO2/MJ, respectively.
