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微细粒煤摩擦电选的试验研究 总被引:2,自引:1,他引:1
介绍了微细粒煤摩擦电选的技术原理及摩擦电选对不同煤种的适应性,研究了气体流量,入料粒度,入料灰分对分选的影响,讨论了优质洁净煤的制备和摩擦电选的影响因素。 相似文献
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将净煤(密度小于1.35 g/m3)与石英、高岭土、黄铁矿、方解石分别按照一定比例混合,将混合物通过摩擦电选的方法进行分离,通过对分离后样品的取样、产率、灰分、硫分分析,研究了煤中矿物质在摩擦电选过程中的脱除规律。 相似文献
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本研究采用摩擦电选法回收废弃线路板中的有机组分,主要探究了废弃线路板非金属组分的摩擦荷电特性,以及在最优分选参数条件下进行静电分选的效果。不同组分荷质比的测量结果显示,PMMA作为摩擦材料使废弃线路板非金属组分中的有机物与无机物荷电性质相反,荷质比差异较大,说明PMMA作为摩擦材料时废弃线路板非金属组分中的有机物与无机物可实现摩擦静电分选。分选结果表明靠近两极位置的收集槽中产品的产率较高,分别为27.22%和51.71%,靠近正极收集槽中产物有机组分的烧失量达到了81.42%。该研究证明了摩擦电选回收废弃线路板中有机组分的可行性,为废弃线路板有价组分的回收和再利用提供了一种有效的途径。 相似文献
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Dry coal beneficiation has been examined by tribo-electrostatic method using Indian thermal coal sample from Ramagundam coal mines. The process of tribo-electric coal/ash cleaning is carried out with a newly built cylindrical fluidised bed tribo-charger with internal baffles, made up of copper metal. The charge transfer in coal maceral and mineral particles after repeated contact with copper plate tribo-charger is measured. Separation of particles in an electrostatic separator according to the polarity of particle charge generated during tribo-electrification is discussed with respect to gas flow rate and residence time in fluidised bed tribo-charger and the applied electric field.The coal and mineral particles charge with positive and negative polarities respectively. The magnitude of particles charge found to be relatively high illustrating greater efficiency of contact electrification in fluidised bed tribo-charger. The separation results with ?300 μm size fraction of coal containing 43% ash showed that the ash content can be reduced to 18% and 33% with an yield of about 30% and 67%, respectively. These results are comparable to the maximum separation efficiency curve of washability studies on this coal sample. Since the ash percentage of coal particles collected in the bins close to positive and negative electrodes are about 70% and 20%, a better yield with low ash content can be accomplished on recycling the material. 相似文献
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文章以原煤筛分和浮沉资料为基础建立了不同粒度级可选性曲线的β曲线数学回归方程,并通过研究得出:该选煤厂要生产灰分不大于20%的动力精煤必须从0.5mm分级,从6mm或3mm分级时,无论如何控制分选密度均不能生产出合格的精煤。若从6mm或3mm分级必须另配外来低灰煤,同时论文讨论了在6mm或3mm分级时,按最高产率原则控制生产的情况时和本厂生产出的动力精煤灰分尽可能低的情况下需配外来煤的数量。 相似文献
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望峰岗选煤厂煤泥水特性的试验研究 总被引:1,自引:1,他引:0
针对望峰岗选煤厂入选原煤中粘土类矿物含量较多的问题进行了激光粒度分析和X射线衍射分析,研究了<0.045 mm粒级中颗粒的粒度分布以及煤泥水中的粘土矿物的种类和含量,并且对煤泥水进行了药剂优化试验,探究了凝聚剂和絮凝剂之间的加药时间间隔对其协同作用的影响。 相似文献
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选煤厂监控系统的研究 总被引:2,自引:0,他引:2
针对选煤厂的生产特点 ,介绍了一套由工业控制机、PLC和触摸屏组成的选煤厂监控系统。该系统可以实时显示、传递和反馈选煤厂生产过程的信息 ,提高了选煤厂的生产质量、效率和自动化程度 相似文献
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采集华蓥山煤田中梁山南矿9个有代表性的煤层样品进行低温氮吸附实验,分析构造煤吸附孔分形特征及分形维数与气体吸附能力的关系。低温氮吸附、解吸曲线表明不同变形序列构造煤在相对压力0.5~1.0范围内吸附特征各异。在此基础上,运用分形FHH方法得到构造煤分形维数D。研究表明:分形维数D可以表征构造煤吸附孔孔径结构和孔表面的变化关系;分形维数越高,微孔含量越多,孔表面越不规则,孔隙结构非均质性愈强;分形维数大小可反映煤的吸附能力,分形维数增高,吸附能力增强。因此,由构造变形增强引起的高分形维数和复杂的孔隙结构显示出更高的吸附能力。 相似文献
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The field trail used a mixture of steam and air with various levels of oxygen enrichment. Steady conditions were achieved
in the field trail which produced high quality hydrogen-enriched syngas. To understand and optimize the UCG process, a simplified
heat and mass transfer model was presented, providing a predictive tool for temperature and the major constituents of the
syngas production. The model is compared with the field trail measurements for air and two levels of oxygen enrichment, showing
reasonable agreement for the channel temperature and product syngas concentration profile.
Supported by the Cultivation Fund of the Key Scientific and Technical Innovation Project, Ministry of Education of Chinese
(02019); Anhui Province Science and Technology Tackling Key Project(08010202058) 相似文献