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过去几年里,滚筒式格筛离心分离机被广泛地应用于美国和其他国家选煤厂中的细粒级物料的脱水中。它的优势在于费用低,产品水分低、操作和维护简单。工程和科技人员普遍认为滚筒式格筛离心分离机在细粒级煤矿脱水时会发生粒度分离。然而,过去并没有对滚筒式格筛离心分离机对粗粒和细粒分离进行过系统研究。本文通过统计设计试验程序来更好的了解和优化滚筒式格筛离心分离机粒度分级效果。本试验在伊利诺斯CoalDevelopmentPark使用滚筒直径为0.5m的连续式滚筒格筛离心分离机进行试验。改变三个关键参数(给料流量、给料中固体含量和池深度)进行总数为17个的三水平因素试验。确定了最佳的试验条件。此时获得的最佳结果为:分选粒度d50c=38μm时缺陷指数为0.13和分选粒度d50c=2.8μm时缺陷指数为0.27。由于有效的去除了超细灰分物料,筒式筛分的给料中的灰分含量从22.3%降至8.84%,并且可燃物的回收率为84.1%,灰分去除率为71.6%。在产物灰分含量为12.5%时,可燃物回收率为92.1%,d50=2.5μm,缺陷指数为0.27。
Over the past few years, tumbler centrifuges have been widely used in the dehydration of fine-grained materials in the coal preparation plant in the United States and in other countries. It has the advantage of low cost, low moisture, easy operation and maintenance. Engineering and scientific personnel generally believe that drum-type screen centrifuge granularity occurs when the fine-grained coal mine dehydration occurs. However, no systematic research has been conducted on the separation of coarse and fine particles from the drum-type screen centrifuge. This article through the statistical design of test procedures to better understand and optimize the drum sieve centrifuge granularity grading effect. This test was conducted at a CoalDevelopmentPark, Illinois, using a continuous drum griddle centrifuge with a drum diameter of 0.5 m. A total of 17 three-level factor tests were changed by changing three key parameters (feed flow, solids content in the feed, and cell depth). Determine the best test conditions. The best results obtained at this time were: a defect index of 0.13 for a sorted particle size of d50c = 38 μm and a defect index of 0.27 for a sorted particle size of d50c = 2.8 μm. As a result of the effective removal of the ultrafine ash content, the ash content in the cartridge sizing feedstock was reduced from 22.3% to 8.84% and the combustible material recovery was 84.1% and the ash removal rate was 71.6%. At a product ash content of 12.5%, the combustible material recovery was 92.1%, d50 = 2.5 μm and the defect index was 0.27.