影响细粒煤振动流化床分选的关键因素

基于振动流化床的分选特性,本文采用200 mm×400 mm振动流化床装置,在不使用任何加重质条件下分选细粒煤(1~3 mm)。详细阐述了振动流化床的系统结构和分选过程。在3种不同床高情况下,利用Design-Expert试验设计手段详细研究了振幅、振动频率、膨胀度以及多因素协同作用对分选效果的影响,揭示各因素与评价指标之间的内在规律。试验结果表明:振动流化床可以排除高灰矸石,得到低灰精煤,精煤灰分为10.77%,相比原煤灰分34.57%降低23.80%左右,矸石层灰分达到54.00%以上,有效实现对细粒煤的分选,达到降灰提质的要求。

Study on key factors affecting separation of fine coal vibrated fluidized bed

Based on the separation characteristics of a vibration fluidized bed,any medium was not used by drying cleaning of fine coal （1-3 mm）in a 200 mm×400 mm vibration fluidized bed in this study.This paper elaborated the separation procedure and system structure of the vibrated fluidized bed.With three different bed heights,the study adopted the experimental installations of Design-Expert and investigated the influence of amplitude,vibration frequency,expansion ratio and multi-factor synergy on separation performance to reveal the inherent law between all factors and the evaluation indicators.According to the experimental results,the gangue of high ash can be removed by a vibrated fluidized bed and obtain clean coal whose ash content reaches 10.77% and reduces by about 23.80% compared with 34.57% ash with raw coal and gangue ash reaches more than 54.00%,which can effectively separate fine coal meeting the demand of the ash reduction and quality improvement.