کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7705393 | 1497293 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Kinetics of iron ore pellets reduced by H2N2 under non-isothermal condition
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Direct reduction experiments under non-isothermal conditions are induced to simulate reaction in the actual hydrogen shaft furnace. Morphology of metalized pellets is analyzed through optical microscope. Weight loss during reduction is recorded and the model of un-reacted core is adopted for dynamic analysis in sections. Compressive strengths of products are also detected. Results show that reduction rates under heating conditions are lower compared with the isothermal situation. The un-reacted core still exists in products. It is found through kinetics analysis that the reaction is firstly mix controlled by the interfacial chemical reaction and internal diffusion, and then controlled dominantly by the interfacial chemical reaction as the temperature and efficient reduction gas content increase gradually with reaction going on. The compressive strengths under heating condition are also lower than the value obtained at constant temperature of 900 °C.This phenomenon may be caused by the crystalline transformation and volume expansion during the dominating Fe2O3 to Fe3O4 reduction at lower temperature. This study can provide scientific guide for rational utilization of hydrogen energy in iron making.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 43, Issue 32, 9 August 2018, Pages 15586-15592
Journal: International Journal of Hydrogen Energy - Volume 43, Issue 32, 9 August 2018, Pages 15586-15592
نویسندگان
Minghua Bai, Hu Long, Liejun Li, Dong Liu, Su-Bo Ren, Chang-Fu Zhao, Jiayuan Cheng,