巷道无线电磁波透视成像技术在煤矿中的应用

以某煤矿现场条件为研究对象,采用无线电磁波透视法对某煤矿16705工作面的隐伏地质构造包括断层、陷落柱、岩浆岩侵入体)、煤层厚度变化等地质异常体进行探测。利用观测的全部原始数据和H0、β参数,采用不同的层析成像处理方法(绝对衰减法、相对衰减法、平均法、中值法、评分法等),得到了吸收系数色谱图。     

煤矿瓦斯富集区电磁波多频同步CT探测技术研究与应用

为了快速有效探测回采工作面瓦斯富集区,基于无线电波透视和联合迭代层析成像原理,建立瓦斯富集区正演模型,采用0. 3、0. 5、1. 5 MHz 3种频率同时进行电磁波CT探测,通过综合曲线和相对衰减系数等值线图来分析其接收场强值、吸收系数及相对衰减系数的变化特征,并在马兰煤矿28118工作面开展了多频同步CT探测试验。研究结果表明:瓦斯富集区相对于正常煤层,从低频到高频,其接收场强值越来越小,吸收系数和相对衰减系数越来越大;综合曲线中实测场强值和相对衰减系数值有明显的交点,相对衰减系数成果图有明显的强衰减区,高频对异常的分辨能力较高。电磁波多频同步CT探测技术能够识别回采工作面中的瓦斯富集异常区。     

无线电磁波坑道透视实测场强曲线的几种特征及分析

无线电磁波坑道透视法对于探测工作面内煤层异常(如陷落柱、断层、煤层变薄区)发挥着重要的作用。在我国这种探测方法在矿井中应用较多,不同工作面的岩层地质情况各异,其产生的探测结果有各自的特点。研究实测场强曲线变化特征,寻找规律,以提高探测解释效率与准确程度。     

多频无线电波透视探测技术在煤层冲刷带探测中的应用

煤层冲刷带通常会引起煤层形态和厚度的变化,给煤矿开采带来不利影响。利用煤层冲刷带与煤层之间存在电性差异,采用多频无线电波透视探测技术可以有效圈定煤层冲刷带。结合不同频率及探测点距条件下电磁波透视探测成果,分析了不同条件下电磁波透视探测的适用性。实际探测成果表明,电磁波透视探测技术是一种有效的回采工作面地质异常体探测手段,在保证透射电磁波信号强度的前提下,探测频率与较小的探测点距能有效提高分辨率。     

瓦斯富集区多频电磁波CT同步透视技术研究

为探明回采工作面瓦斯富集区域,基于电磁波CT透视理论与SIRT层析成像,对不同介质和瓦斯富集区不同频率的电磁波衰减变化曲线和透视层析成像特征进行了数值正演模拟研究,提出了多频电磁波同步透视方法,并在演马庄煤矿开展了瓦斯富集区多频电磁波CT同步透视现场试验。研究结果表明:电磁波CT能够有效探测瓦斯富集区,相对正常煤体,瓦斯富集区呈现为电磁波弱衰减的特征,且频率越高,衰减越严重;高频电磁波相对低频电磁波,衰减幅值稍大,透视距离短,但响应较强;多频同步透视技术可利用高频的高敏感度、响应强的特性和低频的长透距性,透视探测效率快、精度高;井下现场试验验证了多频电磁波CT同步透视技术能够高效、准确识别回采工作面中的瓦斯富集区,可推广应用煤矿生产一线。     

无线电波透视探查地质异常区的应用与分析

当煤层中存在地质异常区，如断裂构造、陷落柱以及富集水的采空区等，电磁波在穿越煤层时会发生吸收、反射和折射等作用，那么构造就会引起电磁波在能量上的损耗，使得接收到的能量显著衰减，进而产生透视异常。存在地质异常体时，衰减系数就较大，反之衰减系数越小。在实际应用中表明，根据煤矿的特点，采用适当的仪器及方法，选择合适的衰减系数值，在工作面坑透探测范围内发现了相对较强衰减异常区，为下一步工作面回采提供技术支撑，确保工作面安全回采。     

基于无线坑透法对工作面勘测应用研究分析

针对N1303工作面回采中可能出现的各种不同类型地质构造问题,采用无线电磁波透视技术,快速圈定工作面开采区域内隐伏的地质异常区域范围,继而得到该工作面场强异常衰减区域共存在7处.探测结果为之后钻孔物探精准定位提供依据,两者数据相互验证,保障矿井高效安全生产.     

无线电波探测瓦斯富集区理论与方法

为了准确预测煤层回采工作面瓦斯富集区情况,基于矿井无线电波透视理论,对瓦斯压力与无线电波透视曲线变化关系进行了物理试验,并根据井下回采工作面实际情况进行了煤层瓦斯富集区的无线电波曲线变化特征的正演模拟,探讨了无线电波透视探测瓦斯富集区的曲线特征,并在煤矿井下进行试验。研究得出,煤层瓦斯压力与无线电波透视衰减曲线呈现一致性变化,煤层瓦斯富集区的存在会造成无线电波坑透的异常区域,相对于正常煤层接收机接收值来说,煤层瓦斯富集区的异常曲线整体呈现接收值偏小,而且中间区域衰减的更大些,两边相对衰减的小些,形成一个“蝙蝠”形状。经过在煤矿井下的实验验证,无线电波透视成果结合地质资料分析,可以用来较为准确地划分煤与瓦斯突出危险区。     

坑透资料的几种不同方法

通过对电磁波坑透探测原理的分析及在矿井的实际应用,对绝对衰减层析成像、相对衰减层析成像、中值法、评分法,平均法五种处理方法的探测效果进行评价,通过对五种方法的比较,能够找到理想的处理方法,从而更准确地反映工作面能的地质异常,更好地为矿井回采进行服务。     

蒙西色连二矿首采工作面内异常坑透探查效果分析

为查明122(中)05首采工作面开采地质条件,利用无线电波透视技术对该面进行了透视成像及地质解释,获得了1800m走向长度范围内的构造异常及其解释特征。后期经过钻探及工作面回采揭示,结合煤层厚度等值线结果图对地质异常区进行了探采对比分析,讨论了无线电波透视异常判断的准确性及其差异原因。认为:2煤层开采过程中,利用无线电波透视技术所获得的探查结果在构造走向及影响范围判断中具有较高的准确率,但需要进一步积累2煤层介质电磁波吸收衰减特征,不断提高工作探查透视距离及解释分辨率。     

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 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     

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     

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.     

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.     

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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