大型矿用挖掘机通风除尘装置的设计研究

大型矿用挖掘机的通风除尘装置的功能是过滤从室外送入机棚内空气中所含粉尘,用清洁的冷空气排除机棚内各机构和电气柜中产生的热量。本文从设计挖掘机通风除尘装置的考虑因素入手、深入研究带有自洁性滤筒式除尘器的工作原理、除尘方式等,确定合理的通风除尘装置设计方案。与采用传统的惰性除尘相比,滤筒式除尘器有效解决了机棚粉尘问题,并成功应用于WK系列大型挖掘机中。     

除尘滤筒脉喷清灰技术研究进展与展望

滤筒清灰是除尘器运行的关键环节,以脉冲喷吹技术应用最为广泛,具有工艺简单、不中断风流等优点。近年来,脉喷清灰滤筒除尘器因技术优势市场份额逐渐增多,相关研究发展迅速。研究者运用理论分析、试验研究和数值模拟等手段对滤筒的脉喷清灰技术进行了广泛探讨,并取得了大量有益进展。阐述了除尘滤筒脉喷清灰技术的基本原理、尘饼附着作用和清灰效果评价方法,分析了影响清灰性能的主要因素,剖析了除尘滤筒脉喷清灰存在的主要问题,总结了提高清灰均匀性改进措施的最新进展,并展望了滤筒脉喷清灰的发展方向。研究表明：滤筒清灰机理的认识普遍采用喷吹压力理论并以筒壁所受静压为喷吹指标;清灰效果评价主要基于过滤阻力的变化和落尘质量;喷吹气流偏斜、清灰不均匀、剥离粉尘回吸是滤筒清灰面临的共性难题,其中清灰不均匀是当前研究焦点;改善滤筒清灰性能主要有喷嘴设计、文丘里管增设、滤筒结构优化、喷吹策略改进等措施,其中协同对撞喷吹突破了单一点源式喷吹的局限,克服清灰不良问题潜力较大。未来研究的重点为脉冲喷吹滤筒清灰机理分析、脉喷清灰结构设计与参数优化、尘饼剥离与运移规律分析、脉喷系统及其参数设计规范建立。研究成果可为促进除尘滤筒脉喷清灰技术的发展和工程应用提供参考。     

旋转滤筒除尘器的探讨

介绍了一种旋转滤筒除尘器,阐述了滤筒过滤原理和性能试验结果,根据滤筒除尘、清灰的特点,提出了分段清灰和控制滤筒转速以提高除尘效率的方法。     

小型振动式滤筒除尘器结构设计

讨论了振动式滤筒除尘器工作基本原理,对除尘器进行了结构设计,主要包括:机组框架设计、箱体面板设计、滤筒的选型、振动清灰机构的设计、风机及电机的理论计算及选型、集尘抽屉设计和控制保护系统的设计等,其中重点计算了风机的重要参数即风机全压,为风机的选型提供了依据。     

矿用干式除尘器滤筒组均量滤脱尘设计

筒式除尘器广泛应用于煤矿粉尘作业场所，具有单位体积过滤面积大、除尘效率高、运行阻力低等优点；筒式除尘器中，滤筒是用于滤尘的核心部件，其滤尘与脱尘的效果是影响除尘器性能的关键因素。根据国内外对筒式除尘器喷吹管的试验研究所得的经验公式，对滤筒清灰系统喷吹管进行了各孔口近均量出流设计，以实现对各滤筒清灰风量趋于相等，消除因各喷口喷吹风量不等导致的各滤筒清灰效果不同，防止清灰强度相对较弱的滤筒因清灰不净积尘糊筒大幅降低滤尘功能。     

不同型式喷吹孔对扁式滤筒除尘器清灰性能的影响

为研究喷吹总面积相同的条缝式喷吹孔与密集圆孔式喷吹孔对扁式滤筒除尘效果的影响,以侧壁压力峰值为主要技术指标分析在不同工况条件下条缝型喷吹孔和密集圆孔对扁式滤筒的清灰性能影响。结果表明:两缝喷吹孔(2×99 mm)、五缝喷吹孔(2×40 mm)在滤筒上部的非正对喷吹孔,压力峰值都无法达到有效清灰强度;在0.2MPa的喷吹压力下,三缝喷吹孔(2×66 mm)优于四缝喷吹孔(2×50 mm),使滤筒底部得到较大压力峰值,可解决扁式方框滤筒下部积灰的严重问题。密集圆孔(88×φ2.4 mm)的喷吹气流主要作用于滤筒上部,在0.1 MPa喷吹压力下,即可实现整体均匀清灰的效果,并可解决扁式方框滤筒上部清灰死角的棘手问题。最优喷吹距离均为20 mm。研究结果对提高扁式方框滤筒在工业中的生产和除尘效率工程实践具有指导意义。     

挖掘机中央枢轴装置对回转支撑机构的影响

大型矿用正铲式挖掘机都采用以中央枢轴为回转中心的滚盘环轨结构。挖掘机工作装置、平台及上车设备的重量、回转装置的自重及挖掘作用时的作用力都要由回转支撑装置来承     

电铲通风除尘系统对比分析

为了找到最佳的通风除尘系统,提高电铲机房内的散热除尘效果,分析了平朔露天矿区6种型号电铲的通风除尘系统,对比分析了各种通风除尘系统的相关参数。结果表明：滤筒式通风除尘系统过滤精度和过滤效率较高,散热除尘效果显著,改善了电铲机舱环境,减少了电气故障,延长了电气元件的使用寿命,降低了设备维修成本。     

矿用井下钻孔全封闭多级除尘装置研制与应用

针对煤矿瓦斯抽采钻孔施工过程中粉尘浓度大,污染工作环境和危害人员健康等问题,基于对现有钻孔除尘技术的研究,研制出一种矿用井下钻孔全封闭多级除尘装置。现场试验结果表明:全尘除尘效率为91.67%以上,呼吸性粉尘除尘效率为90.07%以上;该除尘装置具有除尘效果明显、密封性好、粉尘清灰方便、移动方便等优点。     

岩巷综掘工作面除尘风机应用与研究

旗山煤矿-850 m东二轨道大巷岩巷综掘工作面全长652 m,巷道设计规格(净)为宽4.4 m、高3.4 m,迎头配风量340 m3/min,岩石硬度大,采用德国进口LH1500型掘进机,在掘进过程中,为解决巷道岩尘大,除尘效率低,总粉尘、呼吸性粉尘严重超标问题,针对从德国进口LH1500型掘进机配套的原KCS-310LZ型矿用湿式除尘风机存在的缺陷,选用HCN250湿式除尘系统,其与综掘机组和掘进压入通风配套使用组成的长压短抽湿式除尘系统。该系统使用了附壁风筒和高效湿式除尘器,使之具有高收尘效率和高除尘效率,并使二者有机结合,同时也解决了KCS-310LZ型矿用湿式除尘风机存在的缺陷,达到了理想的除尘效果。     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

2014 second batch of rare earth quota released

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China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.