Calcium Looping: Sorbent and Process Characterization in a 20 kWth Dual Fluidized Bed

Embargo End Date
2022-09-30

Type
Article

Authors
Moreno, Joseba
Homsy, Sally Louis
Schmid, Max
Scheffknecht, Günter

KAUST Department
Clean Combustion Research Center

Online Publication Date
2021-09-30

Print Publication Date
2021-10-21

Date
2021-09-30

Submitted Date
2021-06-01

Abstract
This paper presents an experimental investigation at a 20 kWth calcium looping (CaL) facility with a twofold focus. The first objective is on assessing the multicyclic behavior of limestone under continuous dual fluidized bed (DFB) operation. Different carbonation conditions were employed to derive a mathematical expression that is valid to compare the results from DFB and thermogravimetric analysis (TGA) with adequate accuracy. A preliminary screening of three morphologically distinct limestones was conducted by TGA including exposure to SO2 and H2O during carbonation. The second objective is to analyze the influence of multiple process variables (i.e., temperature, CO2 loading, and H2O concentration) on the performance of the 20 kWth CaL facility’s bubbling fluidized bed carbonator. Within the investigated range of operating conditions, the chosen carbonator design allowed for CO2 capture efficiencies as high as 0.99 mol/mol, yielding an apparent carbonation rate (kSφ) of 0.09 s–1. Paving the way to a more flexible usage of CaL systems, the proposed carbonator design could be integrated into the existing load-following power plants, in preference to a conventional circulating fluidized bed carbonator that is heavily penalized when forced to operate under low capacity factors.

Citation
Moreno, J., Homsy, S. L., Schmid, M., & Scheffknecht, G. (2021). Calcium Looping: Sorbent and Process Characterization in a 20 kWth Dual Fluidized Bed. Energy & Fuels. doi:10.1021/acs.energyfuels.1c01734

Acknowledgements
The authors would like to thank Tim Seitz for his technical assistance during the completion of the fluidized bed experiments.
The authors received no specific funding for this work.

Publisher
American Chemical Society (ACS)

Journal
Energy & Fuels

DOI
10.1021/acs.energyfuels.1c01734

Additional Links
https://pubs.acs.org/doi/10.1021/acs.energyfuels.1c01734

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