Iron-Based Chemical Looping Process for Coal Conversion

摘要

The chemical looping strategy utilizes the redox reactions of metal oxides to convert carbonaceous fuels into separate streams of product and sequesterable CO2. The chemical looping process that developed at Ohio State University uses iron-based oxygen carrier particle to convert coal into valuable energy carriers such as H2 and heat with capturing CO2. There are two different strategies extensively studied to convert coal via chemical looping process at Ohio State University. First, the Syngas Chemical Looping (SCL) process uses synthetic gas (syngas) from the coal gasifiers. The SCL process was demonstrated in the sub-pilot scale (25kWth) system with the iron-based oxygen carriers. The second scheme of chemical looping is to that directly convert solid fuels such as coal and biomass. The preliminary experiments were conducted to prove the concept of direct conversion of solid fuel using the oxygen carrier particles. The studies show that the iron-based oxygen carrier is capable of converting coal to sequestrable CO2.