西门子PLC在空压机站智能控制系统中的应用

针对山东某矿空压机站的5台空压机控制系统存在的不足,研制了以西门子PLC为核心的空压机站智能控制系统,实现了空压机及其冷却水系统的就地、远程和网络监控,达到了按需供风的目标。着重介绍了西门子PLC控制系统的硬件配置和软件设计。     

矿用空压机恒压供气及联动控制系统的设计与应用

针对米村矿空压机在使用过程中存在着空压机供气压力不稳定、保护装置不可靠、控制系统老化、设备运行参数无法精确显示等问题,设计了一种空压机恒压供气与联动控制系统方案,该控制系统可实现空压机的恒压供气,增加空压机联动控制,提高了保护的灵敏性,能详细显示各种运行参数。实际应用表明,该控制系统运行良好,可提高空压机空气的可靠性,保证矿井用风要求。     

矿井双螺杆空压机集中变频控制系统设计

 本文简述了双螺杆空气压缩机的工作原理,介绍了现大多数应用的普通空气压缩机系统存在的能源损耗浪费现象及大功率空压机启动时存在的问题。针对这一情况,设计了空压机变频集中控制系统,对空压机进行统一集中控制,并根据实际需要供气量变频调节,很好地解决了现大量应用的普通空压机系统的问题。对空压机系统设计及普通空压机系统改造有借鉴意义。     

凿井期间空压机站实现变频节能及无人值守的控制系统研究

针对凿井期间空压机存在工况复杂多变、经常需人工干预等问题,设计了一套凿井期间空压机站控制系统,采用PLC、变频器、工控机及压力传感器来搭建空压机调速控制硬件系统,将多个空压机集中控制;采用模糊控制算法,结合压力传感器参数,对空压机压力进行调节.现场应用验证了该系统的可行性.节能效果的定量评价结果表明,该系统节能优化效果...     

基于PLC控制的空压机变频调速系统

为保障空压机安全、稳定地运行,控制其出口压力的稳定相当重要。本文所研究的基于PLC空压机的变频调速系统,对原有空压机的控制系统进行变频调速改造．可以得到稳定的气压,同时监控空压机的各项运行参数及变频器的运行情况,并对系统的故障及时发出报警信号。     

基于PLC的空压机控制系统设计

为了保证空压机安全高效地运行,实现空压机的自动监测与控制,分析了控制要求,应用软启动器、小型PLC和必要的传感器件,设计了空压机控制系统,详细介绍了控制系统的工作原理,软、硬件设计和实现,并给出了梯形图清单。     

基于PLC空压机组节能恒压供气控制系统的设计

针对徐矿集团义安煤矿空压机组控制系统存在的弊端 ,提出了基于 PLC空压机组节能恒压供气控制系统的技术改造方案设计 ,介绍了该系统的组成、工作原理和功能     

MMS-250型双级螺杆式空气压缩机喷油事故的解决措施

淮北矿业集团公司袁店二矿有4台MMS-250型双级螺杆式空气压缩机(简称空压机),容积流量为47.4 m3/min,额定排气压力0.85 MPa;机组采用风冷方式,电动机功率250 kW;采用INTELLISYS智能控制系统。该空压机在使用中出现了喷油事故,为此,该矿对空压机高压电动机的高压接触器进行了改进。     

基于对比评优机制的空压机集控系统的设计

基于对比评优机制的空压机集控系统的设计,解决了多台螺杆式空压机并网运行时集中控制程度不高的问题,在实现了对空压机组实时监控、信息远程共享、故障报警及自动诊断等的基础上,设计对比评优机制,根据所监测的压力、温度终态值及启动过程,对空压机性能、状态进行比较和评价,并将评价结果反馈给控制系统,进而控制空压机运行组合顺序,实现机组运行的最优化。     

变频闭环调节控制系统在空压机中的应用

探讨了变频闭环调节控制系统在空压机上应用的基本原理 ,简略介绍了采用该系统进行技术改造的可行性 ,并以仙亭煤矿正在使用的空压机为例 ,进行了节电效果估算。这对改变空压机以往的运行模式 ,促进空压机的经济运行有一定借鉴意义     

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。