端氏煤矿瓦斯抽采钻孔封孔质量检验方法应用研究

根据管流流体力学理论和漏气检测原理,提出了瓦斯抽采钻孔封孔质量检验判断方法,即通过在正常抽采状态下检测抽采钻孔内不同深度位置的抽采负压和瓦斯浓度,分析瓦斯抽采浓度沿孔深分布的变化规律,实现快速准确判断抽采钻孔密封质量和漏气位置。以端氏煤矿为例,采用钻孔封孔质量检验判断方法,开展了抽采钻孔的密封质量和合理封孔深度的现场试验,结果表明在钻孔深度9~15 m内瓦斯浓度变化幅度较大,存在漏气情况,抽采钻孔的密封质量较差、封孔深度不足。该方法实现了对瓦斯抽采钻孔封孔质量的有效检测,为端氏煤矿调整封孔工艺参数和改进封孔方式提供了科学依据。     

煤矿瓦斯抽采封孔质量检测技术与应用

瓦斯抽采是防治矿井瓦斯灾害的根本措施,而封孔质量的好坏直接影响到瓦斯抽采效果的好坏。为判定瓦斯抽采钻孔漏气位置,在黄陵二号煤矿301工作面针对10个瓦斯预抽钻孔,利用合作研发的抽采钻孔封孔漏气检测装置,开展现场测试工作。结果显示:在钻孔3～16 m内瓦斯浓度的变化比较稳定,漏气通道较少,封孔质量较好,在0～3 m和16～19 m均有漏气现象。判定抽采钻孔的密封质量和漏气位置,可为改进封孔工艺,提高瓦斯抽采效果提供科学依据。     

王坡煤矿封孔质量检测装置的应用试验

基于钻孔瓦斯流动理论,研发并制造了钻孔封孔质量检测装置,通过在不同钻孔深度处的瓦斯浓度和负压检测,判断钻孔漏气位置,从而为瓦斯抽采钻孔封孔提供依据。在王坡煤矿井下选择2个顺层钻孔作为考察对象,开展了钻孔封孔质量检测的现场试验,找出了钻孔漏气点。试验结果表明该装置能较为准确地判断瓦斯抽采钻孔封孔质量,可以有效地指导钻孔封孔,提升瓦斯抽采效率。     

抽采钻孔封孔质量检测方法研究与应用

封孔质量是决定抽采钻孔抽采效果的重要因素。研究抽采钻孔漏气机制,可以为确定抽采钻孔漏气位置和封孔工艺改进提供理论依据。基于采用理论分析、数值计算和现场测试相结合的方法进行抽采钻孔漏气机制研究,合理判定抽采钻孔封孔质量与漏气位置。应用表明,该方法能够准确判定抽采钻孔的封孔质量和漏气位置。     

瓦斯抽采钻孔封孔质量检测设备的研制

针对当前确定瓦斯抽采钻孔封孔深度基本依靠现场经验或钻屑量推算,缺乏直接检测技术手段的问题,设计研制了一种基于嵌入式技术的抽采钻孔检测设备。通过自动检测钻孔内不同深度的瓦斯浓度及其变化规律,判断钻孔漏气位置,确定钻孔封孔深度。设备为抽采钻孔封孔质量检测及封孔工艺改进提供了一种新的可靠的技术手段,有利于提高煤层瓦斯抽采效率。     

瓦斯抽放钻孔封孔工艺改进及效果检测研究

 通过对瓦斯抽放钻孔传统封孔工艺研究分析,在实践总结的基础上,云盖山煤矿一矿改进封孔工艺,提出“矿用合成树脂、水泥浆加压注浆”联合封孔新工艺,并设计研制出瓦斯抽放钻孔封孔漏气检测装置确保钻孔封孔质量,从而简化了瓦斯抽放封孔操作工序,降低了瓦斯抽放封孔成本,保证了抽放钻孔孔口抽采负压,有效提高了矿井瓦斯抽放浓度,实现了矿井安全生产。     

新型囊袋式注浆封孔器在阳煤集团的研发与应用

针对阳泉矿区瓦斯抽采钻孔封孔质量差、抽采效率低的问题,分析了传统的瓦斯抽采钻孔封孔工艺的缺陷,结合阳泉矿区多年来在瓦斯抽采钻孔封孔中的研究,提出了新型囊袋式注浆封孔装置及封孔方法,阐述了该装置的结构、封孔原理及优势,并在阳泉矿区寺家庄煤矿得到了验证。     

云煤一矿设计“两堵一注”封孔器

<正>河南永锦能源有限公司云煤一矿在瓦斯抽采封孔工艺中成功设计了"两堵一注"封孔器。与现有的封孔工艺相比,该装置不但能有效防止漏气,而且使单孔封孔费用降低25.7%。防治煤矿瓦斯灾害的根本性措施之一是瓦斯抽采,决定瓦斯抽采效果的关键因素在于抽采钻孔的封孔技术。由于穿层钻孔存在岩石裂隙或注浆不均匀,经常导致封孔段出现漏气现象,且封孔时间长、成本较高。为了提高矿井瓦斯抽采     

煤矿井下瓦斯抽采钻孔封孔技术研究

针对我国现有煤矿井下瓦斯抽采主要封孔方式,通过分析各个封孔方式的优缺点,得出采动效应下钻孔周边裂隙发育规律研究不透彻、封孔位置选择不合理、现有封孔技术及材料不能有效封堵采动过程中钻孔周边发育的裂隙是造成目前煤矿井下瓦斯抽采钻孔封孔效果不佳的主要原因。通过实验室试验、数值模拟及现场应用手段相结合,深化模拟基础理论研究;构建采动过程钻孔煤体裂隙发育规律理论与模型,确定及优选瓦斯抽采钻孔封孔位置、材料及装置;瓦斯抽采钻孔封孔技术的多元耦合化,降低乃至克服各个技术缺点,提高封孔质量;研发和改进"一体化"封孔装置,简化封孔操作、保证封孔效果、降低封孔成本等方面是封孔技术发展主要方向。     

定长定位封孔工艺的研究及应用

为探索更加简便和有效的瓦斯抽采钻孔封孔技术及工艺,通过对常用的瓦斯抽采钻孔封孔技术及工艺进行分析,研究了定长定位钻孔封孔工艺,并研制出与之配套的两端自堵式封孔囊袋。该技术工艺简便快捷,实现了一次性带压注浆封孔,并能够实现瓦斯抽采钻孔的定长定位封孔,封孔效果较好、效率较高,降低了工人的劳动强度。在龙山煤矿进行了封孔工艺效果对比试验,结果表明:定长定位封孔工艺能提高瓦斯抽采钻孔的封孔质量,单孔平均瓦斯抽采浓度提高约37.5%,所封钻孔的瓦斯抽采浓度衰减速度较慢,钻孔的使用周期较长,高浓度瓦斯抽采钻孔的比例较高。     

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。