CONN-WELD公司香蕉筛在龙固选煤厂的应用

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。     

新型细筛液下筛的研发及应用

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。     

香蕉筛改弛张筛深度筛分研究与实施

以哈尔乌素选煤厂为例,通过在现有香蕉筛基础上增加浮动梁,利用浮动梁与固定梁之间的相互运动产生弛张力,最终将直线香蕉型单层振动筛改造为双层弛张筛,改造后筛分效率达到85%以上,为已建成的选煤厂改造弛张筛提供了一条新的思路。     

分级弛张筛在选煤厂的应用

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。     

ABS4373单层香蕉筛应用实践

为解决济三选煤厂矸石脱介筛处理能力不足、脱介效果差的问题,采用ABS4373单层香蕉筛对矸石进行脱介。介绍了该香蕉筛的结构、工作原理、技术特点、技术参数,并分析了其应用效果;根据ABS4373单层香蕉筛在济三选煤厂的实际应用情况,阐述了其维护与保养措施。生产实践表明:该香蕉筛投入使用后,系统矸石处理能力由300 t/h提升到350 t/h,介耗量由2.80 kg/t降至1.60 kg/t,有效解决了矸石处理能力不足对选煤生产的制约。     

混级物料分级用的动筛风力分级机

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。     

筛面曲张筛

一般的筛子,在筛分湿式难筛粉状物料时,经常发生堵塞筛孔现象,使筛分机不能长时间运转。另外,即使是筛分含水份少的物料,也由于筛孔和波筛的粉状物料间的某种粘合而产生筛孔堵塞。为了防止堵塞,虽然也采用了刷帚、气吹、气吸等方法,但都不是防止粘结、堵塞的好办法。本文介绍的筛面曲张筛打破了目前筛分机制造的一般常识,是一种采用先进机械理论而     

改善SLO系列香蕉筛脱介效果的试验研究

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。     

高庄煤矿选煤厂动筛系统的技术改造

针对高庄煤矿选煤厂动筛系统存在的问题,对动筛跳汰机筛板倾角、筛孔大小、振动频率、洗水水位、排矸系统及原煤运输系统进行了技术改造,提高了动筛系统的处理能力,减少了动筛系统对矿井生产能力提升的影响,取得了较好的经济效益。     

采用双层自清振动筛简化原煤筛分系统

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.……     

国内外香蕉筛的研究现状及今后我国重点研究方向

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。     

螺旋分级筛在新义煤矿选煤系统中的应用

义煤集团新义煤矿地面煤流生产系统运转以来,因原煤含水量较大,黏结和泥化现象严重,经振动筛筛分后,严重堵筛孔,而且湿粉末煤黏结在大块煤矸上进入矸石仓,造成部分粉末煤资源流失。对振动筛影响生产运转的情况进行了分析,提出了改造方案,着重介绍了螺旋分级筛的结构原理、性能特点及其改造后在地面选煤系统中的实际运行效果。     

Separation performance of double deck banana screens – Part 1: Flow and separation for different accelerations

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.     

Using SPH one-way coupled to DEM to model wet industrial banana screens

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.     

薛湖选煤厂筛分作业问题分析与改造

分析了薛湖选煤厂原煤性质,指出了该厂筛分作业在实际生产中所存在的问题,筛分作业效率不高影响了选煤厂后续生产,导致精煤产率降低。通过技术改造,用香蕉筛替代博后筛后成功解决了这些问题。     

橡胶耐磨材料在粉磨行业的最新技术应用及展望

详细介绍橡胶耐磨材料的性能特点,及其在粉磨行业的最新技术。重点介绍橡胶衬板、复合衬板和橡胶筛板的应用技术,以及橡胶耐磨材料在渣浆泵、旋流器、浮选机、高频振动筛及圆筒筛中的应用情况,并对其在国内的发展水平进行了展望。     

筛网堵孔和损坏原因及解决办法的探讨

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。     

大型香蕉筛下横梁截面形状的研究

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。     

防堵塞除尘喷嘴的设计

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。     

DEM simulation of particle flow on a multi-deck banana screen

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.