期刊
JOURNAL OF CO2 UTILIZATION
卷 22, 期 -, 页码 143-154出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2017.09.021
关键词
Steel slag; Blast furnace slag; Thermochemical energy storage; Calcium looping; Concentrated solar power
资金
- Spanish Government Agency Ministerio de Economia y Competitividad (FEDER) [CTQ2014-52763-C2-2-R, CTQ2014-52763-C2-1-R]
- VPPI-US
The Calcium Looping (CaL) process, based on the carbonation/calcination of CaO, has been proposed as a feasible technology for Thermochemical Energy Storage (TCES) in Concentrated Solar Power (CSP) plants. The CaL process usually employs limestone as CaO precursor for its very low cost, non-toxicity, abundance and wide geographical distribution. However, the multicycle activity of limestone derived CaO under relevant CaL conditions for TCES in CSP plants can be severely limited by pore plugging. In this work, the alternative use of calcium-rich steel and blast furnace slags after treatment with acetic acid is investigated. A main observation is that the calcination temperature to regenerate the CaO is significantly reduced as compared to limestone. Furthermore, the multicycle activity of some of the slags tested at relevant CaL conditions for TCES remains high and stable if the treated samples are subjected to filtration. This process serves to remove silica grains, which helps decrease the porosity of the CaO resulting from calcination in the mesoporous range thus mitigating pore plugging.
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