Oxy-Combustion CO2 Emissions Control
Novel Oxygen Carriers for Coal-Fueled Chemical Looping Combustion
Project No.: DE-FE0001808
NETL has partnered with Western Kentucky University to develop a series of advanced oxygen carriers for coal-fueled chemical looping combustion (CLC) to yield a high purity carbon dioxide stream available for CO2 capture for CCUS applications. CLC is a flameless combustion technology where there is no direct contact between air and fuel. The CLC process utilizes oxygen from metal oxide oxygen carriers for fuel combustion. The products of CLC are CO2 and water vapor (H2O). Thus, once the steam is condensed, a relatively pure stream of CO2 is produced ready for storage. The many benefits of this combustion process include minimizing production of oxides of nitrogen (NOX), production of a CO2 stream ready for storage that does not require additional CO2 separation units, and thus there is no energy penalty or reduction in power plant efficiency.
The objective of the project is to develop a series of advanced oxygen carriers for CLC looping combustion. The development of the advanced oxygen carriers will focus on improving overall physical and chemical characteristics and test carriers in an actual CLC facility. Project goals include:
- Developing attrition-resistant and thermally stable oxygen carriers to achieve an auto-thermal heat balance of the processes for generating high purity CO2 with favorable kinetics.
- Evaluating the impacts of scale-up methods and application of inexpensive raw materials (copper-based minerals and widely-available inexpensive clays) for preparation of oxygen carriers on reaction performance in testing within hot-model conditions.
- Preparing multi-metal or free-oxygen-releasing oxygen carriers and exploring their optimal formula and reaction mechanisms.
- Evaluating the adaptability of prepared oxygen carriers to diversified coal types in the hot-model tests and investigating methods for eliminating carbon deposits on oxygen carriers.
|Figure 1: Conceptual schematic of CLC.