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Effect of Ternary Eutectic Salt on the Calcium Sulfate Oxygen Carrier for Chemical Looping Combustion of Coal Char
Author(s) -
Zhang Pengfei,
Ding Ning,
Li Huijun,
Lv Mingming,
Guan Ning,
Liu Zhigang
Publication year - 2017
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201600352
Subject(s) - char , chemical looping combustion , eutectic system , coal , chemical engineering , fluidized bed , ternary operation , materials science , catalysis , chemistry , oxygen , carbon fibers , inorganic chemistry , metallurgy , organic chemistry , composite material , alloy , composite number , computer science , engineering , programming language
The effect of a ternary eutectic salt (43.5 % Li 2 CO 3 –31.5 % Na 2 CO 3 –25 % K 2 CO 3 ) on the CaSO 4 oxygen carrier for chemical looping combustion (CLC) of coal char is experimentally investigated in a bench‐scale fluidized‐bed reactor with steam as the gasification agent at atmospheric pressure and 925 °C. The ternary eutectic catalyst is added to the CaSO 4 oxygen carrier by physical mixing and impregnation, respectively. The enhanced carbon conversion and shortened reaction time in the fluidized bed reactor, coupled with the high weight loss rate of CaSO 4 reduction with CO in the thermogravimetric analyzer (TGA), suggest that the reactions of coal char gasification and CaSO 4 reduction are synergistically catalyzed in the presence of the ternary eutectic salt. The modified oxygen carriers prepared by physical mixing and impregnation show no significant difference in carbon conversion and gasification rates according to the experimental results. The sample with catalyst impregnated into the mixture of anhydrite and coal char gives higher activity compared to the samples with catalyst impregnated into the coal char or anhydrite solely, due to the more uniform distribution of the catalyst.