煤矿瓦斯抽采方法评估系统的研究与实现

为提高煤矿瓦斯抽采方法的选取的科学性和实时性,本文针对煤矿瓦斯抽采方法的特点和适用条件,应用层次分析法和系统分析法对煤矿瓦斯抽采方法6大影响因素和19个基本参数进行了分析研究,建立了影响煤矿瓦斯抽采方法选择的逻辑体系。通过对不同地区地质特性分析,应用模糊数学理论建立不同地区抽采技术评估模型,并在J2EE平台上,研发了B/S架构的煤矿瓦斯抽采方法评估系统,经实际应用验证,本系统评估结果准确可靠。     

基于CFX的煤矿瓦斯抽采主系统管道泄漏数值模拟

为了解大尺度煤矿瓦斯抽采主系统管道泄漏的特征和管道内瓦斯流动多物理场的演化规律,基于Ansys CFX开展了煤矿瓦斯抽采主系统三维数值建模及计算,研究了瓦斯抽采主系统管道不同泄漏位置、不同泄漏强度以及不同抽采泵站负压对抽采管道内瓦斯流动规律的影响,并通过煤矿现场监测数据验证了模型的可靠性。研究结果表明,泄漏强度和抽采负压是影响瓦斯抽采管道内部流场的重要因素,靠近瓦斯抽采主系统抽采泵站的泄漏点更容易被传感器系统所监测。研究成果有望为煤矿瓦斯抽采主系统管道泄漏事故安全防控提供技术支撑,并可帮助优化抽采管道泄漏事故安全防控资源配置。     

基于CFD采空区瓦斯埋管抽采技术数值模拟研究

在高瓦斯厚煤层的开采过程中,瓦斯危害已经影响到煤矿正常生产,其中采空区瓦斯危害是目前煤矿灾害防治的重点之一。以山西晋城寺河矿综采工作面的采空区为研究对象,在分析了寺河煤矿瓦斯抽采现状、工作面瓦斯涌出规律、采空区瓦斯涌出在工作面瓦斯涌出的占有比例、以及采空区埋管抽采瓦斯方法和抽采参数后,构建了该矿采空区瓦斯抽采数值模型,通过分析对比瓦斯运移分布规律模拟结果,得出了寺河煤矿采空区瓦斯埋管抽采技术参数,对提高寺河煤矿采空区瓦斯抽采效率有一定的指导意义。     

煤矿坑道用钻杆使用寿命影响因素分析

随着煤矿瓦斯抽采难度的提高,煤矿坑道用钻杆的使用寿命得到广泛的关注。结合当前煤矿瓦斯抽采钻孔所使用的钻具情况,分析在瓦斯抽采钻孔施工过程中影响钻杆使用的主要影响因素,针对这些损伤钻杆的各因素提出切实可行的措施,为煤矿坑道用钻杆的合理使用提供参考。     

贵州小型煤矿瓦斯抽采现状评价体系的研究

近年来瓦斯抽采成了困扰贵州小型煤矿的主要难题,虽然贵州省已开展多项瓦斯整治项目,但是对小型煤矿瓦斯抽采立项甚少。确定瓦斯抽采现状的影响因素,建立小型煤矿瓦斯抽采现状评价体系,研究评价体系中影响因素的权重值大小并进行排序,对小型煤矿有针对性地改善瓦斯抽采现状具有指导意义。     

五阳煤矿瓦斯抽采参数优化研究

针对五阳煤矿煤层松软、透气性低、瓦斯抽采困难等问题,以瓦斯抽采技术为主要研究内容,结合该矿生产现状,应用RFPA软件建立模型,通过数值模拟对瓦斯抽采效果的影响因素进行了系统的分析。研究了边掘边抽的抽采工艺,优化了瓦斯抽采系统的抽采钻孔的合理夹角,对瓦斯抽采效果进行了分析。在此基础上,针对目前瓦斯抽采系统存在的主要问题,提出解决方案,以提高瓦斯抽采率,确保煤矿安全高效生产。     

基于瓦斯抽采量的有效抽采半径数学模型及工程验证

钻孔有效抽采半径是煤层瓦斯抽采设计的主要参数。本研究确定了煤层预抽钻孔瓦斯抽采量与影响半径的变化规律,建立了利用瓦斯抽采量确定有效抽采半径的数学模型,并提出了模型参数确定方法。在兴隆煤矿进行了抽采钻孔周围瓦斯压力与瓦斯含量在抽采过程中变化的现场测定,根据模型与现场实测得出兴隆煤矿穿层预抽煤层瓦斯措施在抽采时间一定时的有效抽采半径,现场实测结果与模型计算结果基本一致。     

低渗透性高瓦斯煤层水力强化抽采技术研究

瓦斯抽采是解决煤矿瓦斯灾害事故的主要方法,而煤层瓦斯渗透性是决定瓦斯抽采效果的重要影响因素。对于低渗透性高瓦斯煤层,采用水力强化抽采技术可以有效增加煤层瓦斯渗透性,从而提高瓦斯抽采效率。本文分析了水力割缝、水力压裂瓦斯强化抽采技术的原理及工艺。探讨了利用高压水流冲击煤体的水力割缝和水力压裂强化瓦斯抽采方法的可行性。     

永华郭村煤矿瓦斯抽采钻孔影响半径变化规律研究

本文结合永华能源有限公司郭村煤矿煤层的实际情况,分析煤矿的瓦斯抽采影响因素,采用多元线性回归法进行现场测试和数值模拟,分析瓦斯抽采影响半径和钻孔孔径的关系,并建立了孔径和抽采时间的关系模型,为确定合理孔径和孔间距提供参考依据。     

穿层钻孔瓦斯抽采半径测定影响因素优化分析及应用

为了准确测定煤层瓦斯抽采半径,分析了影响瓦斯抽采半径测定的主要因素,并对主要影响因素进行了优化。通过在小屯煤矿采用相对瓦斯压力降低法现场测定表明,该方法用于测定瓦斯抽采半径效果较好,并结合抽采前后煤层瓦斯含量进行对比验证。     

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.