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CONN-WELD公司香蕉筛在龙固选煤厂的应用 总被引:1,自引:1,他引:0
龙固选煤厂的原煤分级选用从美国CONN-WELD公司引进的3.6 m×7.3 m单层香蕉筛。阐述了此香蕉筛的结构特点与工作流程,并且针对实际使用过程中存在的大块物料堵塞筛孔以及冲击输送带的问题,对筛机与带式输送机进行了改造。对于筛孔堵塞问题,在几个方案中选取了比较新颖的加一层棒条筛的方案。对于大块物料冲击输送带的问题,采用了成本比较低实施容易的2个方案,最后介绍了改造效果。 相似文献
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为了提高细筛设备的筛分效率,云南科力环保股份公司针对普通筛分设备筛网使用寿命短、筛孔易堵塞的问题,进行了筛分动力—活塞式脉冲研究,研发了一种新型细筛液下筛。液下筛工作时脉冲使料浆产生高频和低幅横向振动,迫使小于筛孔尺寸的固体颗粒快速穿过筛孔,颗粒与筛面间没有相对运动,颗粒不会堵塞筛孔且筛分效率高。试验证明:液下筛的逆向给料方式和脉冲系统解决了常规细筛设备易堵塞、筛网寿命短的缺陷,可根据不同料浆调整运行参数,从而保证高筛分效率、大处理量,且指标稳定可靠,有利于厂矿工艺的简化及优化,应用前景广阔。 相似文献
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通过对原煤特性,现有筛分设备的工作特性和筛分过程中存在的弊端进行调研分析,针对细粒级物料易粘结成团、松散困难、易堵塞筛孔的特点,选煤厂引进了分级张弛筛,在选煤厂的生产实践中实现了6 mm的高效筛分,提高了综合分选效率,提升了商品煤质量,又减少了煤泥的处理量,可以为企业带来良好的经济效益。 相似文献
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动筛和定筛式风力分级机是一种全新的分级设备,分级效率高,筛面不易磨损,筛孔不易堵塞,适于细粒分级,可以降低块煤中的限下率。 相似文献
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介绍了SLO系列香蕉筛的特点,分析了屯兰矿选煤厂SLO系列香蕉脱介筛应用中存在的问题,通过技术改造,改善了脱介筛的脱介效果,减少了产品带介量,降低了重介介耗损失,对使用SLO系列香蕉筛的选煤厂有一定的参考价值。 相似文献
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1概述
动力煤选煤厂的原煤筛分系统,通常采用两段筛分工艺:50 mm预先分级和13 mm二次分级.旗山煤矿是一座年产1.5 Mt的大型矿井,选煤厂采用原煤两次分级、筛块煤入洗工艺.原筛分系统的毛煤首先进一台筛孔50 mm的WP-1756振动筛预先分级;大于50 mm的进手选工序,小于50 mm的通过一部B=1 000 mm的刮板运输机分配,进3台筛孔为13 mm的ZKD-1840振动筛二次分级,筛块煤入洗,筛末煤直销.工艺系统复杂,设备多,生产成本高.通过技术改造,采用一台双层自清振动筛,直接实现原煤两次分级,简化了筛分系统,取得了较好经济效益.…… 相似文献
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国内外香蕉筛的研究现状及今后我国重点研究方向 总被引:3,自引:0,他引:3
简述了香蕉筛的筛分原理和基本特性,介绍了国内外一些典型的香蕉筛的现状及其主要特点,并分析了我国香蕉筛目前存在的一些问题。同时提出了今后我国重点研究的方向:深入研究筛分机理;研究结构新颖的香蕉筛;研究各项技术参数之间的关系;采用先进分析软件优化分析;简化结构及制造工艺;加强关键件加工工艺的研究;制造采用的材质的研究;研究降低噪声的方法;加强构件表面耐磨、耐腐蚀问题的研究。 相似文献
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Banana screens are often used for high capacity separation of iron ore, coal and aggregates into different size fractions. They consist of one or more curved decks that are fitted with screen panels with arrays of square or rectangular holes. The screen structure is vibrated at high frequency to generate peak accelerations of around 4–6g which separates particles flowing over each screen according to their size. Screens are often used to close comminution circuits and return specific size fractions of rock to different destinations such as pebble mills, crushers and back into the mills. All multi-deck screens are difficult to sample for intermediate products which makes measurement and optimization very difficult. Banana screens are even more difficult because the screen cut size varies with the varying slope of the decks. In this paper, the discrete element method (DEM) is used to simulate a full industrial scale double deck banana screen for a range of accelerations. The nature of the particle flow through this complex machine is explored for a range of peak accelerations. Critical aspects of the flow are linked to the separation performance. 相似文献
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Large banana screens with multiple decks are used extensively in the process separation of many valuable export commodities. They are high capacity vibrating screens with a curved profile. Discrete Element Method (DEM) modelling using non-spherical particles has previously provided significant insight into the operation of these dry industrial screens. Here we introduce the use of Smoothed Particle Hydrodynamics (SPH) to model the flow of slurry (water and fine material) through a double deck banana screen. This paper firstly reports on the underlying DEM model of the coarse particulate flow on a full-scale banana screen. We then use Smoothed Particle Hydrodynamics (SPH) to model the transport of fine particle slurry over and through the double deck banana screen. Finally, we combine the DEM with SPH models using a one-way coupling to simulate the effects of adding a slurry flow to coarse particulates on the banana screen. The key outcomes from this study are that; SPH is ideally suited for the high speeds and the high fragmented and filamentary nature of the fluid flow through the screen deck openings; the fluid only (SPH) model of slurry behaves similarly to the DEM approach in that more fluid is screened as the velocity slows, except near the earlier panels on the top deck; and, use of a porous media derived from DEM in one-way coupled approach with SPH produces clear and reasonable changes in fluid structure, separation and wetting of the screens consistent with slurry behaviour. Specifically, the fluid layer was much thicker in the coupled case, with slurry being trapped inside a coarse particle bed and which is sensitive to the fluid viscosity. 相似文献
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筛网堵孔和损坏原因及解决办法的探讨 总被引:1,自引:0,他引:1
分析了影响振动筛筛网堵孔的原因,尝试利用三角孔筛网的自清理功能来解决筛网的堵孔问题通过对3种不同孔形防堵筛网性能的比较,阐述了筛网安装的注意事项和使用的具体要求,并指出了可能引起筛网损坏的原因。 相似文献
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在实际生产中,大型香蕉筛下横梁经常发生断裂,严重影响香蕉筛的使用寿命和运行效果。以3661香蕉筛下横梁为研究对象,分析了下横梁在实际工作中的受力情况,利用solidworks软件建立了五种不同截面形状的下横梁横实体模型,利用有限元分析软件对五种下横梁进行了应力计算。从计算结果发现无论是最大位移还是最大应力,圆形管梁是五种横梁中较为理想的下横梁,为提高下横梁的可靠性提供设计思路。 相似文献
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通过对除尘喷嘴工况的分析,介绍了一种新型防堵塞除尘喷嘴的结构,通过理论计算得出其设计参数。通过使用此防堵塞除尘喷嘴,可以提高内喷雾喷嘴的使用寿命,改善工作面环境,降低粉尘对工人的危害,节约维修维护时间,降低生产成本,提高效率。 相似文献
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Banana screen is an important innovation in screening process in the past decades to improve screen capacity. Although, it is increasingly employed in the mineral industry, the control and optimisation are still limited due to the lack of fundamental understandings of the process. This paper presents a numerical study of the particle flow on a banana screen at a particle scale by means of Discrete Element Method (DEM). Typical 3-deck and 5-deck banana screens are simulated. The effects of operational conditions and geometry on the screen performance are studied by a series of controlled numerical experiments. The results are analysed in terms of partition curves, distributions of percentage passing and other flow information, such as particle volume and velocities along the screen deck. They are useful to the development of a better understanding and the control of banana screening processes. 相似文献