4.7 Article

Ca-based sorbents as precursors of oxygen carriers in chemical looping combustion of sulfurous fuels

Journal

FUEL
Volume 312, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2021.122743

Keywords

Chemical looping combustion; Sulfur; Ca-based sorbent; Calcium sulfate; Oxygen carrier

Funding

  1. [PID2019-106441RB-I00]
  2. [MICIN/AEI/10.13039/501100011033]

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Four different physico-chemical characteristics of Ca-based sorbents were evaluated as suitable precursors for CaSO4-based oxygen carriers in CLC systems.
Limestone Chemical Looping Combustion process (LCL-C T) patented by Alstom Power Inc. proposes the formation of a CaSO4 oxygen carrier via sulfur retention process when supplying a Ca-based sorbent together with sulfurous fuels in the fuel reactor. In the present research work, four Ca-based sorbents, three limestones and one dolomite with different physico-chemical characteristics, have been evaluated as oxygen carrier precursors during consecutive redox cycles by thermogravimetric analysis. 5% H-2 and 3000 vppm H2S (N-2 to balance) and 10% O-2 (N-2 to balance) were selected as reducing and oxidizing gases, respectively. Additionally, an anhydrite ore has also been studied for comparison purpose. Results from SEM-EDX characterization of the sorbent particles revealed the existence of three different sulfation patterns: (1) uniform distribution, (2) core-shell structure and (3) high sulfur content with high limitation to be converted into CaSO4. All sorbents exhibited high oxygen transport capacity (R-oc = 13.3-20.8%), except for the material showing pattern (3) (R-oc = 2.6%). Likewise, the materials presented high reactivity with rate index values ranged between 11.0 and 18.8%/min. Therefore, the Ca-based sorbents herein assessed can be considered suitable precursors for the formation of CaSO4 based oxygen carriers to be used in CLC systems burning sulfurous fuels.

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