A fuel cell generates electricity by virtue of the reaction between hydrogen and oxygen in the air. The problem is that CO2 is emitted in the process to extract hydrogen from the reformer using city gas. Tokyo Gas successfully put a system to collect and recycle CO2 emitted from a phosphoric acid fuel cell into practical use. The system can collect 15.4 kg of CO2 out of 51.4 kg of CO2 emissions from a phosphoric acid fuel cell (PAFC) at an output of 100 kW per hour. In addition, it reduced power consumption to collect CO2 from 28 kW to 12 kW.
The emission gas from a PAFC is cooled and dehumidified using the pretreatment unit to make it dry gas from which only CO2 is extracted using the pressure swing absorption (PSA) method. The separated CO2 is processed by the liquefied apparatus and filled in a portable cryogenic container. It can be used for CO2 welding and as a solvent to micronize an agent. Because the system allows collected CO2 to be used directly, the system will introduced to the plant factory operated by Chiba University.
An experimental plant factory for tomato growing of Chiba University