کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
238831 465777 2008 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Density-dependent separation of dry fine coal in a vibrated fluidized bed
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Density-dependent separation of dry fine coal in a vibrated fluidized bed
چکیده انگلیسی

The main purpose of coal separation is to reduce ash, sulfur, mercury and other mineral contaminants in the coal to increase the calorific value and benefit the environment. Dry coal beneficiation has obvious advantages over the wet process although the latter is currently the predominant method in use throughout the world. A vibrated fluidized bed was constructed for separating dry fine coal particles from unwanted gangue particles. An experimental investigation of vibrational energy transmission, and the interaction between vibration and gas flow, was performed. The motivation for these experiments was a theoretical development of the principles involved in forming a dense-media vibrated fluidized bed (DMVFB). The mechanism of bubble breaking by vibration is discussed. A formula for calculating the critical vibration frequency at which bubbles can be efficiently broken and bubble formation restrained is proposed. The experimental results demonstrate that the density of a dense-media vibrated fluidized bed is uniform, with a maximum relative error of 1.68% under optimal technological and operating conditions. The < 6 mm fine coal was efficiently separated with a probable error E value of 0.07 t/m3. A lower limit of separation of 0.5 mm was achieved. The DMVFB separation efficiency is higher than wet jig with E value of 0.11 t/m3.

Graphical AbstractA dense-media vibrated fluidized bed (DMVFB) was constructed for separating dry fine coal particles from unwanted gangue particles. The experimental results demonstrate that the density of a DMVFB is uniform, with a maximum relative error of 1.68%. The < 6 mm fine coal was efficiently separated by DMVFB with a probable error E value of 0.07, better than by wet jig.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Powder Technology - Volume 187, Issue 2, 28 October 2008, Pages 119–123
نویسندگان
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