Testing of innovative Fe- and Ca-Mn-based oxygen carriers with natural gas in continuous operation
Conference poster, 2017

Chemical-looping combustion (CLC) of gaseous fuels, such as natural or refinery gas, could be a viable option in a variety of industries for production of heat and electricity with CCS. Further, CLC can be combined with conventional steam–methane reforming for efficient carbon-neutral hydrogen production. A series of collaborate European projects have been carried out since 2002, which focused on oxygen-carrier development and upscaling of both the CLC process and oxygen-carrier production with natural gas and refinery gas as fuel. In the latest project, SUCCESS (2013-2017), a series of oxygen carriers based on Fe and Ca-Mn materials were developed using commercial and low-cost raw materials. Two commercial methods for particle production were used: impregnation of Fe2O3 on Al2O3 and spray-drying of CaMnO3. In this paper, selected results are presented from investigation of these two promising oxygen carriers using a laboratory-scale unit with continuous operation and a nominal fuel input of 10 kWth. In this unit, the gas velocities in the riser and in the grid jet zone of the gas distributor come close to gas velocities of industrial-scale units and the material is exposed to a large number of redox cycles. Therefore, this unit is highly applicable for judging particle lifetime. Both materials functioned well during operation with natural gas, with little or no agglomeration. The total time with fuel was 30 h and >100 h for the impregnated Fe-based material and the Ca-Mn-based material, respectively. Although the degree of elutriation was high for both materials, the actual fines production (<45 µm) was high only initially, but decreased as a function of time. Almost full gas yield to CO2 could be obtained with the spray-dried Ca-Mn-based material, and up to 85% yield was obtained with the impregnated oxygen carrier based on Fe at 950°C.

perovskite structure

CLC

CCS

oxygen carrier

CO2 capture

Chemical-looping combustion

fluidized bed

Author

Tobias Mattisson

Chalmers, Energy and Environment, Energy Technology

Patrick Moldenhauer

Chalmers, Energy and Environment, Energy Technology

Peter Hallberg

Chalmers, Energy and Environment, Energy Technology

Frans Snijkers

Marijke Jacobs

Knuth Albertsen

Gareth Williams

Andrew Scullard

Anders Lyngfelt

Chalmers, Energy and Environment, Energy Technology

9th Trondheim Conference on CO2 Capture, Transport and Storage, Trondheim, Norway, June 12-14, 2017

Subject Categories

Energy Engineering

Areas of Advance

Energy

More information

Created

10/7/2017