کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6465100 1422951 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Utilization of semi-dry sintering flue gas desulfurized ash for SO2 generation during sulfuric acid production using boiling furnace
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Utilization of semi-dry sintering flue gas desulfurized ash for SO2 generation during sulfuric acid production using boiling furnace
چکیده انگلیسی


- A process is proposed that desulfurized ash is utilized to produce SO2.
- Thermodynamics and simulation calculations were conducted.
- The kinetics equation describing the decomposition reaction was established.
- The decomposition characteristics demonstrated by TGA and DTF experiments.
- The results of our study provide new insight into the study of SSFGDA reuse.

To effectively solve the problem of reutilizing semi-dry sintering flue gas desulfurized ash (SSFGDA) from steel plants, a new technology is proposed in this paper in which ash is added to a boiling furnace to obtain SO2 during sulfuric acid production. Using thermodynamics and simulation calculations, the high-temperature characteristics of CaSO3 in the ash were preliminarily investigated. By using Kissinger method and the models of Achar and Coats-Redfer, the decomposition kinetics equation of CaSO3 in the ash were obtained. The decomposition characteristics of CaSO3 in the ash were further investigated by thermogravimetric analysis (TGA) and drop tube furnace (DTF) experiments. The results show that at temperatures below 400 °C, free water is lost and Ca(OH)2 decomposes, whereas at approximately 460 °C, part of the CaSO3 is oxidized. Above 680 °C, CaCO3 begins to decompose, with the decomposition process terminating at 790 °C. The remaining CaSO3 continues to decompose at approximately 810 °C. The activation energy of CaSO3 decomposition is 261.45 ± 77.93 kJ/mol; the pre-exponential factor is expressed as ln(A/s−1) = 26.13 ± 7.29, and the kinetics equation is dα/dt = 2.19 × 1011 × exp(−3.11 × 104/T). Pressure, temperature and oxygen content are the key factors affecting the decomposition of CaSO3 in the ash. A lower pressure and oxygen content and a higher temperature can facilitate the decomposition of CaSO3 and can be achieved in actual sulfuric acid processing plants. Therefore, in this study, the feasibility of preparing SO2 by adding desulfurized ash during the production of sulfuric acid using a boiling furnace was preliminarily examined and verified.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 327, 1 November 2017, Pages 914-923
نویسندگان
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