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通过对青海2种原煤的煤质分析、浮沉试验,得到了原煤的可选性曲线,并对2种原煤进行了煤炭可选性评价,为今后2种煤炭的洗选设计提供数据支持。 相似文献
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赵彩颖 《煤炭加工与综合利用》2004,(4):31-33
利用EXCEL软件进行煤炭筛分浮沉试验结果的整理和可选性曲线的绘制 ,不但客观而具有科学性 ,而且减少了人为因素的影响 ,提高了工作效率。 相似文献
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VBA语言在Excel中编制选煤厂月综合报表的应用 总被引:1,自引:0,他引:1
介绍了用VBA语言在Excel中编制选煤厂月综合报表的过程,首先自定义系统菜单,根据用户要求确定筛分粒度点和浮沉密度点,录入、计算筛分浮沉试验数据,即可生成月综合报表,最后可通过数据绘制原煤可选性曲线;该程序操作简单、运行速度快、维修方便。 相似文献
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《煤炭加工与综合利用》2021,(3)
阐述了哈尔乌素选煤厂对6 mm深度筛分—浅槽精度分选的工艺技术进行的研究。研究结果发现:弛张筛在进行6 mm筛分时,变频器频率取48 Hz(曲轴转速570 r/min)时,弛张筛有较好的的筛分效率,为88.26%;入洗原煤大于13 mm粒级的可选性为中等可选,大于6mm粒级的可选性同样为中等可选,降低了浅槽的入料粒度下限,可选性未发生大的变化;各粒度级精煤产率在80.04%~88.99%之间,实际分选密度δ_P在1.50~1.62 g/cm~3之间,且粒度越小,分选密度δ_P越大;可能偏差E值在0.025~0.065 g/cm~3之间,且粒度越小,可能偏差E值越大。基于研究结果形成了弛张筛6 mm深度筛分—浅槽高效分选工艺,降低了重介质浅槽入料的粒度,提高了煤炭入洗率,实现了提质增效。 相似文献
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介绍了办公软件Excel 2000在煤炭筛分浮沉试验中各种工作表的制作及计算中的应用,列举2个例子进行说明。 相似文献
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通过对怀仁选煤厂入选原煤的工业分析及粒度组成、浮沉组成、可选性分析,制定了适合原料煤特点及市场要求的分选加工工艺流程.总结了该工艺流程的主要特点,简单介绍了用该工艺建成投产的怀仁选煤厂经济效益情况,证明了该工艺的简单、高效、可靠性. 相似文献
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煤炭可选性评定方法的现状与研究方向 总被引:2,自引:0,他引:2
煤炭可选性是选煤工艺研究和选煤厂设计的主要依据;介绍了国内外常用的煤炭可选性评定方法以及近几年来用煤岩学研究煤炭可选性的观点;分析了分选密度±0.1含量法在评定煤炭可选性时存在的问题;提出了煤炭可选性评定方法研究的发展方向。 相似文献
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The swelling behaviour of a single coal particle was examined photographically under rapid heating up to 870 K in an atmosphere of nitrogen or hydrogen, to test how treatment with liquid ammonia affected the swelling property of a Japanese bituminous coal. It was found that the treated particle began to swell at higher temperature than the untreated one in either atmosphere, and that the impregnation of the treated coal with a nickel salt appreciably suppressed the swelling of coal particles especially those of smaller particle size. 相似文献
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用正交试验研究常压固定床气化炉内石灰石/白云石的固硫行为,研究煤样,脱硫剂,添加物和实验条件等对固硫效果的影响,实验发现;大粒度煤栗有利于固硫;白云石比石灰石固硫效果好,不同种类石灰石之间固硫效果存在差异,大粒度脱硫剂,高钙硫比均有利于固硫。 相似文献
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分析了煤样破碎、缩分和干燥的相关问题,并给出了具体的处理方法。对于破碎后的煤样粒度要求,建议某一粒级破碎后的煤样以全部小于该粒度为宜;针对目前2种破碎煤样水分偏倚试验方法存在的问题,提出了新的水分偏倚试验方法。指出缩分后总样质量取决于煤样粒度、煤样品质不均匀性及所要求的制样精密度,分析了总样质量与各影响因素之间的变化关系;阐述了二分器缩分法、九点取样法、堆锥四分法、棋盘法、机械缩分应用中需要注意的问题。最后分析了干燥过程中,采用两步法测定全水分时第一步干燥温度不能高于40℃的原因,并归纳了空气干燥应用原则。 相似文献
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通过对望峰岗选煤厂煤泥性质的分析,说明入浮平均粒度较粗,各粒级煤泥灰分均在30%以上,嵌布较均匀,单体解离度低,为浮选降灰带来困难;煤泥表面接触角较小为50.06。,说明其天然可浮性较差,经捕收剂十二烷或柴油处理后,煤泥接触角增大,煤的可浮性提高;若要求精煤灰分为14%,则标准浮选精煤产率约为65%。通过单因素试验确定煤浆质量浓度为80g/L,捕收剂用量为800∥t,起泡剂用量为128g/t时,煤泥浮选效果较好,浮选完善度最高为66.94%,精煤灰分符合要求,精煤产率较高为71.67%。最后以捕收剂、起泡剂和煤浆质量浓度为正交因素设计正交试验,考察各因素对煤泥可浮性的影响,并得出最佳浮选药剂制度。结果表明:当捕收剂用量为1000g/t,起泡剂用量为42g/t,煤浆质量浓度为60g/L时,煤泥浮选效果最好,此时精煤产率为71.59%,精煤灰分为14.30%,达到高产降灰的目的。 相似文献
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The properties, settling rates, and the rheology of coal-water mixtures (CWM) made up from different coals were investigated. Test suspensions containing different concentrations of suspended particles were made up from each of four different pulverized parent coals: a Pittsburgh Seam No. 8 coal, an Illinois coal, and the product and feed from a flotation process using an Illinois coal. All the parent coals had broad particle-size distributions. In addition, the Pittsburgh Seam No. 8 coal was classified into four different size fractions using sieving, resulting in three coarser, narrow particle size cuts and the fine residual fraction passing 325-mesh, which had a broad size distribution. The property characterizations for all coals included the following: elemental analyses, heating values, particle size analyses, particle surface areas and pore sizes, solid heat capacities, and thermal conductivities. Tests on the suspensions included detailed supernatant ion analyses, and measurements of pH values and zeta potentials. For each test coal maximum-packing volume fractions were estimated using centrifugation, and the settling rates and directly measured yield stresses, using the vane method, were determined for every concentration of coal-water mixtures (CWM) used. The shear-stress/shear-rate dependences of the test suspensions, covering the shear-rate range from 0.1 to 105 s−1, were determined using a capillary rheometer. For some of the test suspensions, correction for a pronounced wall-slip effect was required. Apart from the directly measured yield stresses using the vane method, yield stresses were estimated indirectly by extrapolation and rheological model-fitting. Extrapolation of directly measured yield stresses to infinite limit was used to estimate maximum packing for comparison with those determined from the irreducible sediment volumes using centrifugation. The two-parameter power-law, Bingham plastic and Casson empirical rheological models, and the three-parameter Herschel-Bulkley and Sisko models were used to fit the shear-stress/shear-rate data. In general, the shear-stress/shear-rate dependence was found to be shear-thinning, power-law, over the lower ranges of shear, and to tend to Newtonian limit at high shear; a dependence which is best described by the three-parameter Sisko model. 相似文献
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通过对各单种煤进行归类合并、煤质检验,为配煤工业试验提供基础依据。同时论述了配煤工业试验的原理和试验方法。系统应用配煤工业试验方法指导焦化配煤比,可降低炼焦配煤成本、优化配煤结构、提高焦炭质量,极大程度满足高炉炼铁的生产要求。 相似文献