共查询到19条相似文献,搜索用时 170 毫秒
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可选性曲线在煤炭分选效果预测、运营管理、结果评价等各阶段都被重用,其准确高效绘制非常必要。为适应当前选煤智能化发展趋势,基于常用的智能算法平台,提出了一种利用Python软件绘制原煤可选性曲线的方法,借用国标煤炭浮沉试验数据,并结合NumPy、Scipy、Matplotlib、Pandas等第三方库,进行选煤生产中常用的HR可选性曲线的绘制。研究结果表明,利用Python软件可实现HR可选性曲线的自动绘制,且绘制结果满足选煤生产需求。利用Python软件绘制煤炭可选性曲线有助于实现煤炭重选效果预测优化决策与选煤智能化系统的无缝衔接。 相似文献
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什么是煤的可选性 ?“MT56 - 81《中国煤炭可选性评定标准》宣贯说明”和煤炭工业出版社《选煤手册》确定了如下的意义 :“煤的可选性是一个概略的定性的概念 ,它表示按要求质量指标从原煤中分选出精煤产品的难易程度”。并指出煤的可选性评定必须与分选效果相结合 ,可选性的好坏表现为分选后精煤数量效率的高低。根据这个定义 ,影响煤炭可选性难易程度的主要因素是密度组成和对产品的质量要求。一些国家 (包括我国 )采用分选密度±0 .1含量法 ( δ± 0 .1含量法 )评定某种煤在确定的精煤灰分 (即分选密度 )下的可选性。这种方法有 3个缺点… 相似文献
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可选性曲线和重选分配曲线是计算干选机性能基础的指标,分选效率、可选性曲线偏差、排矸率、矸石带煤率和脱硫率等指标取决于设备分选性能、操作经验和原煤可选性。可能偏差(E_p)值为衡量分选机效率的指标,影响E_p值的主要因素包括原煤可选性、分选密度和入料粒度,结合干选厂的分选数据分析对常用干选机的性能评定指标进行探讨。由可选性曲线可判定原煤在某一分选密度下可选性的难易程度,并可提供精煤理论产率及方便分选数量效率的计算。通过分配曲线可反映干选的精确度,可能偏差(E_p)受原煤粒度、分选密度和颗粒形状等影响,可能偏差值越小说明分选精度越高,错配物越少。 相似文献
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为提高煤炭分选加工效率,促进节能减排,基于煤质特征以及矿区附近煤炭用户的需求,呼吉尔特纳林才登矿区制定了相应的洗选产品结构。通过粒度组成分析、密度组成分析、可选性分析认为:该矿区末煤指标满足要求,不需要进行洗选,但块煤量大且指标不合格,必须进行分选加工;理论分选密度下,块煤可选性为易选。经选煤方法以及不同矿井原煤在不同分选下限时分选效果的简要对比,推荐采用分选效果更好、次生煤泥量更少、适应性更强的浅槽重介分选工艺;分选下限推荐采用6 mm,此时技术经济指标最佳。 相似文献
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介绍如何使用Auto CAD命令绘制选煤生产中经常用到的原煤可选性曲线,以及使用这种方法绘制的可选性曲线的特点。 相似文献
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《Minerals Engineering》1999,12(9):1051-1058
There is considerable interest in developing new approaches to obtaining washability data, especially in coal preparation. Here, the traditional “sink float” method has been used for decades. Obtaining the data, however, is costly, and often the analysis time required is too long for the data to be useful as part of a feed-back control strategy. Further, the dense liquids used to conduct the analysis can be problematic, on health and environmental grounds.The purpose of this paper is to describe a new method for conducting washability analysis, using fluidization. Although we have used this method on coal particles smaller than 2 mm, the method may be applied to particles of any size or density. Although the process of fluidization is well established, its application to obtaining washability data appears to be novel. Narrow size fractions of the sample are obtained using conventional sieving. One of the narrow size fractions is placed into the fluidized column, where it segregates readily producing a pressure profile, with the less dense particles at the top and the progressively denser particles below. The pressure profile of the suspension is measured using differential pressure transducers. Samples of the suspension are removed from the vessel, the change in the suspension pressure profile measured, and the dry weight of the discharged sample determined. These data are then used to obtain the particle density. 相似文献
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《Minerals Engineering》2004,17(1):93-96
A new coal washability index, termed as ‘near gravity material index (NGMI)’, has been developed based on the sink-float data. This new index incorporates the effect of ash distribution in the near gravity material at various specific gravities of separation. The optimum specific gravity of separation of a particular coal may be determined by plotting NGMI as a function of various specific gravities of separation or the desired clean coal ash content. The concept and the method of calculation of this index have been discussed in detail. Using some published float-sink analytical data, a quick comparison of the washability characteristics of several different coals is demonstrated utilizing the NGMI curves for these coals. 相似文献
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对七星洗煤厂在入选难选煤的实践中现状进行了介绍,并对跳汰机的分选原理进行了分析,通过对跳汰机部分结构的改造和对操作制度的调整,使利用跳汰机选难选煤的效益明显提高。 相似文献
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简单实用的可选性曲线画法 总被引:1,自引:0,他引:1
可选性曲线是煤质分析和选煤厂设计的基础,因此,如何既简单又准确地画出可选性曲线 显得尤为重要。文章结合大家熟练掌握的计算机知识,介绍了可选性曲线的又一种简单画法。 相似文献
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煤炭可选性的控制因素及其评价 总被引:1,自引:0,他引:1
介绍了影响煤可选性的因素 ,并以乌达矿区难选煤层 1 5煤层煤为例 ,对其中的黄铁矿和粘土矿物的赋存状态作了讨论 ,分析了其可选特性 相似文献