离心泵性能现场测试中的两个问题

针对矿山具体条件,提出了正压排水时水泵扬程和系统测地高度的现场测试方法;指出了目前负压排水时泵扬程测试的误区,并给出了解决办法。     

探讨矿井自动排水系统的优化

近年来,水口山铅锌矿先后对井下5个泵房进行了自动排水改造,有力地保障了矿井的保安排水,节能效果也极为显著。通过对5个自动化排水泵房运行情况的调查,发现它们都存在一定的问题和缺陷,对此,从水位检测系统的优化、增加紧急停泵功能、增加时限换泵功能、水泵星三角启动优化、构建故障自诊系统和净化水仓水质六个方面提出建议,以优化自动化排水系统,进而提高矿井排水系统的安全性,降低企业成本。     

哈拉沟煤矿井下水泵监控系统设计

以哈拉沟煤矿井下用水泵为参考,介绍了水泵工作过程,设计了一款基于MCGS人机界面的煤矿井下水泵监控系统,该系统以西门子S7-200 Smart PLC为控制核心。仿真结果表明,该系统运行正常,满足井下煤矿环境要求,提高了井下排水工作的稳定和可靠性。     

矿井主排水泵自动控制的研制

我矿是年生产能力为190万t／年的现代化矿井,井下涌水量较大,-1000m泵房设计安装了4台D280-43×6主排水泵,配套电动机315kW,2路排水管。正常涌水时,1台工作,2台备用,1台检修。目前该矿水泵的开停及选择切换均由人工完成,做不到根据水位或其它参数自动开停水泵,这将严重影响井下主排水泵房的管理水平和经济效益的提高。为此,我们对-1000m泵房主排水系统进行自动控制研制。该自动控制系统通过检测水仓水位和其它参数配合,控制水泵工作,合理调度水泵运行。     

基于PLC的井下主排水自动控制系统

针对煤矿井下主排水系统人工控制方式存在的工序繁琐、耗能大等问题,提出采用主排水自动控制系统实现对井下水泵的自动控制,该系统采用PLC作为控制核心,实现了对水泵运行状态、运行过程的自动监控,减少了人工投入,降低了运行成本。     

王坡矿井下排水自动化控制系统设计与应用

针对王坡矿井多水平排水系统中各泵房依靠自身排水进行控制,各排水设备未及时更新、维修费用高、排水效率低等问题,为在安全高效完成排水任务的基础上,把系统的用电量尽可能地降到最低,根据信息互通、集中控制的原则,开发了一套排水控制系统,对技术方案、系统组成以及主要设备和传感器进行了介绍,并阐述了实现功能。应用结果表明：该系统实现了单水平自动排水和多水平协调优化排水控制,水泵运行安全可靠,抗干扰性强,系统数据可通过井下环网上传到地面监控中心,停泵水锤现象得以缓解,漏水故障得以避免,提升矿井排水效率10%以上,可为类似矿井排水提供技术参考。     

PLC在煤矿水泵自动控制中的应用

PLC控制技术已广泛应用于各个行业,在煤矿井下主排水泵房使用PLC控制,实现自动控制,系统通过检测水仓水位和其它参数,控制水泵轮流工作与适时启动备用泵,合理调度水泵运行,保证了煤矿排水系统的安全.     

矿井排水泵并联增效

矿山井下涌水以及生产废水常将其汇集于矿井底部水仓中，由离心水泵排至地表经处理后流入江河。矿井地下涌水量季节性变化相当大，雨季的井下涌水量相当于非雨季的数倍。雨季要开动大型水泵或者多台中小水泵才能把井下涌水排完，排水管网中通过的水量很大，排水管口径较大；非雨季只要开动中小型泵就能将水排完。仍用雨季大口径管道排水，就使非雨季运行的离心水泵与排水管道匹配时，工况点常在水泵的低效区，导致排水泵低效运行，增加能耗，降低经济效益，故需要寻求增效方法。     

井下排水控制系统设计及应用

设计了基于ARM和Win CE的井下排水控制系统,利用水仓水位、用电的避峰填谷等科学因素来调度排水泵的运行时间,当井下排水泵出现故障时,系统可以自动切换至备用水泵,还可以实现管路的自动选择,以实现水泵的自动化监测与控制。大量使用数据表明,该井下排水控制系统不仅仅具备较高的自动化程度,在运行过程中既稳定又可靠;在实际应用中,多台水泵同时运行可以帮助煤矿企业实行无人值守,降低煤矿工人的工作强度,提高矿井的生产效率,降低能源消耗。     

煤矿排水自动化系统的研究与应用

矿井排水自动化系统主要是采用可编程控制器(PLC)和上位机组态画面对井下排水系统的多台水泵进行监控,合理调度水泵运行,实现井下无人值守自动排水,通过网络实现远程监控,对实现矿井安全排水有着重要的意义。     

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     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586     

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     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。