期刊
CHEMICAL ENGINEERING JOURNAL
卷 377, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.08.036
关键词
Oxy-fuel combustion; Desulfurization; Limestone; Kinetics
资金
- National Research Council of Science AMP
- Technology (NST) Grant from the Government of Korea (MSIP) [CRC-15-07-KIER]
- Basic Science Research Program of the National Research Foundation of Korea (NRF) - Ministry of Education, Science, and Technology [2017R1D1A3B03033160]
- National Research Foundation of Korea [2017R1D1A3B03033160] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We compared the direct desulfurization behavior of four different domestic limestone samples (CaO fraction 40-55%, average particle size 37.5 mu m) using a thermogravimetric analyzer (TGA) for experiments conducted under oxy-circulating fluidized bed (CFB) combustion conditions (temperature 600-850 degrees C, CO2 60-95%). In addition, morphological variations of the limestones were analyzed during indirect and direct desulfurization using a scanning electron microscope (SEM). The data derived from the TGA experiments were applied to a gas-solid reaction rate model, and reaction kinetics at different temperature and carbon dioxide (CO2) ratios were analyzed; we suggested the most suitable kinetic models for direct desulfurization. The direct desulfurization reactions of limestones increased in rate with increasing temperature. The activation energy of 50-120 kJ/mol was calculated using various gas-solid reaction models. By measuring the Brunauer-Emmett-Teller (BET) specific surface areas of the limestone samples, we explained the differences in the final conversion rates of the limestone samples.
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