关键词: 煤, 碳捕集, 部分氧解耦化学链燃烧, 硫演化及分布, 协同脱硫脱碳

Abstract:

Evolution and distribution of gaseous and solid sulfur during the chemical looping combustion under partial oxygen uncoupling (CLPOU) of Liuzhi coal with CuFe2O4 oxygen carrier were studied in the high-temperature fixed bed reactor, and effects of reaction temperature, oxygen carrier added amount and CO2 atmosphere on sulfur migration and transformation were further investigated. The results show that in the temperature programmed experiment as well as the isothermal experiment, the identifiable gaseous sulfur at the outlet is only SO2, while the solid sulfur is mainly determined as Cu2S. Moreover, increase of reaction temperature and addition of oxygen carrier promote the oxidation of sulfur in coal, which leads to the release of more gaseous SO2; while the CO2 atmosphere inhibits the generation of SO2. Due to the high reactivity of the combined oxygen carrier and the excellent sulfur fixation characteristics of Cu-based oxides, the CuFe2O4 oxygen carrier is expected to achieve in-situ simultaneous decarbonization and desulfurization in the process of coal-fueled chemical looping combustion.

Key words: coal, carbon capture, Chemical Looping combustion under partial oxygen uncoupling (CLPOU), sulfur evolution and distribution, simultaneous decarbonization and desulfurization