煤矿瓦斯煤尘燃烧与爆炸研究现状及展望

瓦斯煤尘爆炸事故是煤矿灾害事故之一,为了预防和控制井下此类事故的发生,国内外研究者采用理论分析、实验研究和数值模拟等手段对瓦斯煤尘着火特性、瓦斯煤尘复合火焰传播规律及瓦斯爆炸诱导沉积煤尘参与爆炸等进行了深入的大量的研究,本文对该研究方向上的国内外研究成果进行了综合评述,并展望了瓦斯煤尘爆炸未来科研方向上的关注点。     

煤矿井下局部通风机智能监控系统的设计与应用

文章在概述煤矿井下瓦斯浓度和煤尘爆炸下限浓度关系的基础上,提出了煤矿井下局部通风机智能监控系统设计及应用的必要性,分析了智能监控系统设计原理以及系统组成、控制结构和通信控制系统的运行过程.结果表明,基于PLC控制的煤矿井下局部通风机智能监控系统可兼顾井下瓦斯浓度和煤尘浓度,并根据爆炸性气体浓度变化而实时调节风速和供风量...     

冲击气流诱导对沉积煤尘参与瓦斯爆炸的试验研究

为研究井下瓦斯爆炸诱导沉积煤尘参与爆炸现象,利用独头试验巷道模拟不同体积瓦斯爆炸产生不同诱导强度的冲击气流,并对沉积煤尘的诱导飞扬能力和参与爆炸传播规律进行研究。结果表明:瓦斯爆炸产生的冲击气流能卷扬沉积煤尘飞扬,形成煤尘"二次爆炸",进一步扩大爆炸的伤害范围;当瓦斯区的气体体积从50 m3增加到200 m3时,瓦斯爆炸产生冲击气流在瓦斯段峰值压力从0.14 MPa增加到0.31 MPa,卷扬沉积煤尘的诱导卷扬能力增强;试验测试煤尘段的最大爆炸压力分别达到0.36和0.83 MPa;无煤尘火焰长度分别为75.1和115.2 m,整个爆炸过程朝更迅猛的方向发展。     

关于煤矿瓦斯监控系统的探究

瓦斯爆炸是井下事故中占比较高的一种.当发生瓦斯爆炸时,如果缺乏有效应对措施将造成很大的伤害和损失.结合矿井实际情况,设计瓦斯监控系统,实时监测瓦斯浓度,可以起到提早预防、避免发生事故的作用.文章对瓦斯监控系统的硬件和软件设计进行论述,为瓦斯监控系统的发展与改进提供参考.     

曲江井监测监控系统井下监测站的选用

曲江井为煤与瓦斯突出矿井 ,所采的B4、C8煤层均具有煤尘爆炸危险、自燃及易自燃特性。按规程要求必须装备矿井安全监测监控系统。1　监测监控系统井下监测站　　曲江井矿井监测监控系统由地面主站、井下监测站和监测各种被监测参数的传感器三大部分组成。地面主站和监测传感器都是通用的 ,各个生产监测监控系统厂家的产品大同小异 ;而井下监测站有两种比较有代表性的产品 :常州自动化研究所生产的井下监测分站 (以下简称分站 ) ;镇江中煤电子研究所生产的井下矿用监测仪或南昌煤矿仪器设备厂生产的井下矿用双路断电仪 (以下简称监测仪 )。…     

一起特别重大瓦斯煤尘爆炸事故分析

描述了鲁山县新生二矿特别重大瓦斯煤尘爆炸事故发生的概况及现场勘察情况,分析了事故发生的原因及发生过程,给出了瓦斯积聚原因和煤尘参与爆炸的结论。提出低瓦斯矿井应加强瓦斯管理,建立瓦斯监控系统及瓦斯管理制度;煤尘具有爆炸性的矿井应建立洒水防尘系统,建立防尘管理制度,进行作业点粉尘浓度检测,及时清扫积尘,并应安设防隔爆设施。     

摩擦撞击火花及其事故预防

摩擦撞击火花及其事故预防山东省煤炭工业管理局钟千鑫关键词摩擦撞击火花，瓦斯煤尘爆炸，事故预防１概述煤矿井下发生瓦斯煤尘爆炸事故，严重威胁煤矿安全生产和职工生命安全，给国家带来重大经济损失。发生该类事故的直接原因是工作现场瓦斯积聚和煤尘飞扬严重，其点火...     

矿用救生舱抗爆性能试验研究

在断面积7.2m2、全长896m的大型试验巷道中模拟井下瓦斯、瓦斯煤尘爆炸,进行矿用救生舱抗爆性能试验。通过测试爆炸压力及观察舱体内活体动物的受损情况,分析了煤矿井下瓦斯爆炸、瓦斯煤尘爆炸对救生舱的损坏程度,可为矿用救生舱的研制和安装技术研究提供基础数据。     

K J2000N监测监控系统的应用与分析

介绍了KJ2000N监测监控系统的特点、应用以及该系统在实际应用中出现的问题和采取的相关解决办法。当矿井发生瓦斯、煤尘事故时,该系统能够快速自动切断受灾区内非本质安全型电器电源,避免因电器火花引起瓦斯与煤尘爆炸事故。对于3 000 m长距离采煤工作面的监测监控的应用,提出了实际的方法,为同行业矿井安全监测监控提供了依据和技术支持。该系统具备国内先进水平,在同类矿井安装使用方面具有可推广性。     

矿井瓦斯爆炸事故的预防

<正> 瓦斯爆炸历来都是煤矿极其严重的一种灾害,一旦发生,不仅能造成人员的伤亡,而且还会严重摧毁井下设施,影响生产,甚至会引起煤尘爆炸,矿井火灾以及冒顶等二次灾害,从而造成严重的经济损失。为了预防瓦斯爆炸事故,必须很好地了解瓦斯爆炸的发生、发展规律以及采取有效预防瓦斯爆炸的措施。我局是全国煤矿瓦斯爆炸较严重的一个局,从1948年5月起至1991年1月份止共发生死亡3人以上重大瓦斯事故27起,其中最大的一次是1988年11月26日平岗煤     

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     

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.