燕子山煤矿综放工作面综合防灭火技术应用研究

针对燕子山煤矿8901综放工作面回采期间面临的煤炭自然发火问题,结合监测数据综合分析了发火原因,提出了均压通风、封堵漏风、采空区注氮和地面集中灌浆相结合的综合防灭火技术.现场应用结果表明:8901综放面采空区的漏风量由150 m3/min降至20 m3/min,CO浓度由0.0015％逐渐降至0.000015％,工作面上隅角CO浓度始终保持在0.000015％以下.     

浅埋藏煤层火区下开采均压防灭火技术研究

为了解决元宝湾煤矿浅埋藏煤层火区下开采采空区自然发火有毒有害气体涌出和回风隅角低氧问题,提出了风机-风窗联合均压防灭火技术,测定6105工作面在额定风量1200m~3/min时的通风阻力约194~202Pa,采用2组4台2×45k W局部通风机(两用两备)向工作面供风,通过减小调节风窗面积来提高工作面压力。结果表明:6105工作面均压防灭火系统启动后,工作面风量为1220m~3/min时,通过风窗调节,地表至6105工作面的通风阻力降为0Pa,处于平衡状态,回风隅角CH_4,CO气体浓度均为0,O_2和CO_2气体均维持在安全浓度范围之内,证明均压系统起到了较好的效果。     

易发火综采工作面均压通风系统优化与应用

针对马脊梁煤矿易发火综采工作面均压通风系统存在的回采后期及倒面搬家时期均压通风系统与运输系统的矛盾,通过局部优化改进,实现了二者平行作业,并在马脊梁煤矿新设计的14-3号煤层305盘区8509易发火综采工作面对改进系统进行了工程实践应用,实施优化改进后,8509工作面进风量由原来的680 m3/min增加到800 m3/min,回风量由原来的278 m3/min增加到790 m3/min,卸压漏风大幅减少;上隅角和回风巷CO体积分数由192×10-6减少到0,仅用18 d就完成了该工作面的搬家倒面工作。     

处理上隅角瓦斯的J型通风系统

由于工作面单产提高,工作面瓦斯涌出量增大,原有的U型通风系统不能有效解决工作面瓦斯超限问题。为此,王庄矿开发试用了J型通风系统,在工作面瓦斯涌出量达15～25m3/min的条件下,供风量为1300～1600m3/min,消除了工作面上隅角瓦斯超限。     

大埋深综放工作面自然发火防治技术与实践

为防治3下109工作面煤层的自然发火,采取采空区两巷隅角砌注高分子挡风墙、隅角切顶排设挡风帘、对顶板破碎带注马丽散、罗克休进行充填加固、风机均压、注CO2、高分子灭火凝胶等措施。实践结果表明,防火技术实施效果良好,有效地降低了工作面自然发火灾害的发生,为工作面安全生产提供了保障。     

蒋家河矿ZF201综放工作面防灭火技术与应用

蒋家河ZF201综放工作面自开采以来,采空区CO浓度持续上升,当工作面推进到130 m时,CO浓度已达到463×10-6,工作面有严重的自燃倾向。为了防止ZF201工作面自然发火,通过埋管检测确定了该工作面自然发火区域,进而采用了新型的注氮技术,结合上下隅角设置挡风帘和上隅角注浆综合防灭火措施,使上下隅角及工作面的CO浓度降低到12×10-6以下,并且使采空区的自燃区域转化为惰化区域,成功防止了工作面遗煤自燃,保证了采煤安全,对类似条件下的综放工作面防灭火具有一定的理论意义和实用价值。     

老年褐煤综放工作面CO来源分析及治理技术研究

针对敏东一矿低变质老年褐煤低温氧化造成综放工作面回风隅角CO超限问题,通过分析I0116³00综放工作面回风隅角CO来源,提出了以有害气体抽采为主,以帷幕注氮、气幕稀释、喷洒阻化剂、均压通风等为辅的综合防治技术措施,并进行了现场应用。研究结果表明:I0116³00综放工作面回风隅角埋管进行CO等有害气体控制抽采,有效降低了隅角及回风CO浓度;采空区帷幕注氮,惰化遗煤氧化,可以有效抑制CO的生成量;局部均压通风和上隅角导风对抑制采空区CO涌出有较好的效果,工作面最佳配风量控制在1 350 m³/min左右并适当提高上隅角风压,有效减少了采空区CO涌出。通过现场应用,消除了I0116³00综放工作面回风隅角CO超限隐患,为回采工作面的安全生产提供了保障。     

3_248工作面初采期间瓦斯治理配套技术

工作面上隅角瓦斯涌出量大小,与采空区漏风量呈正相关关系,即:漏风量越大,瓦斯涌出量也随之增加;不利于工作面抽放。为此,在3248工作面采取了上、下隅角封堵、加挂风障措施。初采期间,将风量由1200m3/min调至1000m3/min。     

耿村煤矿二_3-13160工作面采空区防灭火技术

通过对耿村煤矿开采的二3煤层综放工作面采空区容易自然发火的原因分析,得出了综放工作面CO涌出规律,构建了防灭火技术体系,确定了综放工作面采空区自然发火的标志性气体CO浓度临界值为100×10-6,保证了工作面的安全推进,对类似矿井具有借鉴作用。     

综放工作面瓦斯涌出规律分析

为给解决高瓦斯单一低透气性难抽煤层综放开采工作面上隅角瓦斯积聚难题提供数据支持,采用控制单元体法,进行立体网格状的测点布置,对某工作面瓦斯浓度三维分布进行了测定和分析,绘制了瓦斯浓度分布等值线图,根据数据分析结果及瓦斯守恒方程和风量守恒方程,获得了采煤时采空区瓦斯涌出总量为1.77 m3/min;煤壁瓦斯涌出量为2.30 m3/min;落煤瓦斯涌出量为1.87 m3/min;工作面风排瓦斯总量为11.88 m3/min;工作面落煤、煤壁和采空区瓦斯涌出量的比值分别为31.5%、38.7%、29.8%。     

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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