THE SYNGAS CHEMICAL LOOPING AND COAL DIRECT CHEMICAL LOOPING PROCESSES: PILOT-SCALE TEST UNIT DEVELOPMENT AND OPERATION

摘要

To achieve the U.S. government's goal of 28% CO_2 emission reduction by 2025, the development of various high efficiency carbon capture and sequestration (CCS) technologies has become high-interest fields of research. The Ohio State University (OSU) has successfully developed a platform of chemical looping technologies for the conversion of multiple carbonaceous fuels such as coal, natural gas, biomass, and synthesis gas to an expansive portfolio of end products including electricity/steam, hydrogen, liquid fuels, and other high value chemicals without the need for cost intensive gas-gas separation techniques such as the air separation unit. The presented work will discuss two specific chemical looping technology platforms in development at the pilot scale - the syngas chemical looping (SCL) and coal direct chemical looping (CDCL) technologies. Both technologies use a unique counter-current moving bed reducer reactor design to fully convert the carbonaceous feedstock to high purity CO_2 with a minimal solid circulation rate.