Title of article :
Density-dependent separation of dry fine coal in a vibrated fluidized bed
Author/Authors :
Luo، نويسنده , , Zhenfu and Fan، نويسنده , , Maoming and Zhao، نويسنده , , Yuemin and Tao، نويسنده , , Xiuxiang and Chen، نويسنده , , Qingru and Chen، نويسنده , , Zengqiang، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Pages :
5
From page :
119
To page :
123
Abstract :
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.
Keywords :
Coal , Dense medium , Vibrated fluidized bed , Bubble , Density , Separation
Journal title :
Powder Technology
Serial Year :
2008
Journal title :
Powder Technology
Record number :
1697953
Link To Document :
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