کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7061969 | 1459424 | 2018 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermal decomposition mechanisms of coal and coal chars under CO2 atmosphere using a distributed activation energy model
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The thermal decomposition characteristics of Sanxing (SX) coal and coal chars (C500 and C850, produced at 500 and 850â¯Â°C, respectively) were tested by nonisothermal thermogravimetric analysis and a distributed activation energy model used to determine the kinetic parameters. The effects of char-making temperature were investigated. A sharp peak was seen in the relationship between X and activation energy (E) of the SX and C500 samples; no evident peak, but a ladder-shaped decline, was shown by C850. The temperatures at which E was maximized were relatively close for SX coal and C500, while the minimum value of activation energy was almost the same for the three samples. This showed the char-making process had less influence on the gasification reaction under high-temperature conditions. The results of the kinetic compensation effect between E and the pre-exponential factor (k0) showed that different kinetic compensation mechanisms occurred for the pyrolysis- and gasification-dominated stages.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 662, 10 April 2018, Pages 41-46
Journal: Thermochimica Acta - Volume 662, 10 April 2018, Pages 41-46
نویسندگان
Haopeng Wang, Zhichao Chen, Xiaoyan Zhang, Zhengqi Li, Neng Fang, Xiaoying Liu,