外文翻译--煤矿开采与安全.doc

附录1 煤矿开采与安全关键词: “三软”煤层; 矿压显现特征一、 “三软”煤层放顶煤工作面矿压规律研究1 工作面概况 12090 工作面位于大峪沟矿务局红旗井西二采区东翼下部, 西至西二皮带运输下山, 东至西二采区边界停采线. 工作面走向平均长420 m , 倾向长100 m.该工作面回采的二1 煤层, 赋存于二叠系山西组下方. 煤层由于受沉积环境及后期构造运动的影响, 厚度不均, 变化较大, 在回采范围内有薄煤带存在(上副巷在掘40180 m 段时, 煤层厚度变为01. 6 m ) , 给回采工作带来一定难度. 煤层倾角为714, 煤层平均厚度为4. 62 m , 煤质为无烟煤, 煤质松软、强度极低, 易冒落. 直接顶板为砂岩、泥岩和砂质泥岩; 直接底板为砂岩、灰岩; 在直接顶、底板之间, 局部存在伪顶和伪底, 其岩性多为炭质泥岩或泥岩, 厚度一般小于0. 5 m .2 矿压观测内容及测点布置 矿压观测的主要目的是了解大峪沟矿务局“三软”煤层炮采放顶煤工作面的超前压力分布规律及顶板初次来压步距、周期来压步距和强度. 主要观测内容有巷道支架压力、工作面支架压力. 同时在观测过程中还要注意采面、支架的宏观状态变化; 观察顶煤破碎放出情况以及顶煤放出后顶板的运移3 工作面超前压力的分布特征3. 1 观测数据整理 工作面回风巷超前压力观测期间, 每天派专人到井下记录各测站压力表读数, 测量工作面至测站的距离, 宏观观察机巷、风巷及围岩的变化状况, 并测量支架剧烈变形区至工作面的距离. 经过计算处理, 绘出图表.3. 2 超前压力分布规律 由风巷支架受力实测曲线可知, 因工作面采煤而引起的超前压力影响至工作面前方34 m 处, 即处于工作面前方34 m 以内的回采巷道将受到工作面超前压力的影响. 超前压力峰值区在工作面前方912 m 处, 该段巷道变形量显著增加, 顶部荆笆折断增多, 有时还会出现煤兜, 有碎煤屑落下. 工作面前方34 m 以外的巷道可认为不受超前压力的影响, 处于应力稳定区.由于二1 煤层属于“三软”不稳定厚煤层, 老顶来压不明显, 导致工作面前方集中应力分布范围扩大, 应力峰值区距工作面较远, 应力集中系数不大, 但巷道围岩相对移近量较大, 为减少回采巷道围岩的过度变形与破坏, 充分发挥支架对围岩变形的控制作用, 工作面前方21 m 范围内的两巷要进行超前支护.4 采煤工作面顶板来压规律4. 1 采煤工作面矿压观测数据的收集与处理 为了解炮采放顶煤工作面支架载荷及顶板矿压的分布规律, 在红旗井12090 工作面利用减压式压力计对工作面支架载荷进行了一个半月的现场观测, 观测结果经过计算处理后所得结果如图 3 - 图5 所示. 图3 是将所测工作面支柱载荷数据以观测循环为横坐标, 以时间加权平均支架载荷作为纵坐标. 由图3 可看出, 沿工作面推进方向, 顶板有周期性运动现象, 周期来压步距为19 m. 图4 是以工作面斜长为横坐标, 以正常推进时3 个测站所测支柱载荷的平均值为纵坐标. 由图4 可见, 沿工作面倾斜方向顶煤(板) 运动矿压显现有分区特点, 中间压力最大, 上部次之, 下部最小.4. 2 采场矿压显现的基本规律 通过对观测数据的分析, 采场矿压显现有如下明显特点:(1) 总体来说, 支架初撑力及工作阻力均不大. 由于本工作面与型钢梁直接接触的上位顶煤很软,再加上顶板也很软, 在支设支架时初撑力很难提高.平均初撑力为226. 38227. 36 kN/ 对棚, 为额定工作阻力的15. 4 %16. 8 % , 工作阻力平均为252. 84272. 44 kN/ 对棚, 为额定工作阻力的17. 2 %18. 5 % , 来压时最大工作阻力为372. 4 kN/ 对棚,占额定工作阻力的23. 3 % , 平均支护强度为102. 3144. 5 kN/ m2 . 造成这种现象的原因主要是底板和顶煤太软, 单体柱插底严重(有的支柱插底达到 700 mm 以上) , 有时钢梁还钻顶. 较低的支护体刚度, 限制了支架能力的发挥.(2) 在工作面连续推进过程中支架载荷变化不 剧烈、矿压显现较缓和、周期来压不明显(与分层开采相比变化不明显) , 表明采场上覆岩层运动不剧烈.(3) 老顶初次来压步距为19 m 左右, 来压期间支架插底量普遍增加, 最深达到95 cm ; 煤壁片 帮严重, 最深达到0. 5 m ; 护顶杆折断增多, 超前替棚矿压显现明显.(4) 顶板周期来压步距一般为612 m , 平均为9 m. 来压时, 支架峰值载荷与平均载荷比值一般为1. 11. 3 .(5) 工作面上、中、下3 处工作面支架阻力基本相同. 这主要是由于顶煤松碎, 顶板极易垮落,两巷放煤后, 上下隅角处基本不出现三角弧形悬顶. 整个采场顶板垮落均匀, 采空区充填效果较好.(6) 顶板压力放煤前较放煤后小, 放煤前平均为237. 16 kN/ 对棚, 放煤后平均为268. 52 kN/ 对棚. 这主要是因为放煤前采空区被垮落的顶板和顶煤充填较实, 在采场形成了一个由底板、支架、垮落物、顶煤组成的平衡体系, 在这一体系中, 支架主要起支撑上位顶煤和下位顶板的作用. 放煤后,架后原先由垮落顶煤充填的空间被放空, 而顶板的完全垮落要滞后, 原先的平衡体系被破坏, 这时的支架不仅要支撑上位顶煤, 还要支撑顶板及附加在上面的压力, 因此支架受力有一定增加. 但该面顶板较软, 随采随垮, 不会形成大面积悬顶, 垮落时不会对支架造成冲击危害.5 结论 12090 炮采放顶煤工作面支架载荷偏小, 矿压显现不明显. 这一方面因为该煤层属于“三软”煤层, 支柱插底让压严重, 支架效能未能得到充分发挥; 另一方面因为该工作面顶板较厚, 随采随落,采空区充填效果较好. 有鉴于此, 应提高采面的支护刚度, 提高支柱的初撑力, 增加支架的稳定性.二、 煤矿瓦斯爆炸事故的电气诱因与对策目前，我国煤矿大多以向上倾角向前掘进，使得这类煤矿具有局部或全部上倾的巷道顶部，其原因是为了利用重力作用运出开采的煤。由于煤矿巷道中溢出的瓦斯气团比空气轻，这样瓦斯气体在空气中受到浮力作用便会沿着上倾的巷道向顶部流动，集聚在巷道顶部的最高点(采煤面)附近，形成体积比为515的瓦斯空气可爆混合气体。因此，煤矿上倾巷道顶部具有瓦斯气体集聚的“自恶化作用”。目前我国煤矿所采用的通风方式不能完全消除这种可爆混合气体的形成，这是该类煤矿瓦斯爆炸的主要原因之一。应该说接连不断的煤矿瓦斯爆炸使从事矿井作业的相关部门和人员吸取了不少悲痛的教训，由此也采取了一定的措施，但是爆炸事故依然有增无减，这说明在历次事故总结出的原因之外，还有主要的根本诱发因素。笔者就近年来多例煤矿瓦斯爆炸事故及其所公布的事故原因作了不完全统计，分析发现煤矿瓦斯爆炸事故的主观、客观因素是多方面的，但是最根本的直接因素不外乎两个主要方面：一是矿井内局部瓦斯浓度达到爆炸极限；二是在第一要因存在的基础上，矿井多类电气设备缺陷或操作违章诱发电气火花或爆炸所致。对于第一要因的消除，有关方面已经作了卓有成效的讨论，下面笔者主要就第二要因进行统计、分析，并提出相应的抑制电气诱因存在的看法。1煤矿瓦斯爆炸事故的电气诱因类型煤矿爆炸的物质基础瓦斯是矿井中煤或其他炭物质形成的气体，其主要成分为甲烷，比空气轻，易燃烧、易爆炸。瓦斯聚集到一定的浓度，在矿井内部空气的助燃下，一旦遇到电气火花等火源，就会发生爆炸。据中国工程院和煤炭信息总院联合做出的我国煤矿安全生产形势、差距和对策的课题报告，目前中国矿井的原有安全设施严重老化，不少设备超期服役。煤矿不能进行足额安全投人，不但新设备无法补充，原有设备的维护也被省略。笔者把近年来因各类电气设备缺陷等诱因导致煤矿瓦斯爆炸的情况归纳如下：11矿井供电电源缺陷矿井市电电源供电可靠性差、自备电源(发电机)容量小，选型、配置不合理，运行性能差等造成供电中断，矿井中瓦斯气体超标。实例1：2004年3月山西省某煤矿爆炸，28名矿工全部遇难。据当地安全生产监督管理部门介绍，3月1日下午6时48分，该煤矿市电大电网限电停电，便启动刚购进的400kW发电机，该发电机全自动调压，但电压升到280V后，就再也升不到380V的额定电压。煤矿又换上一台90kW的旧发电机发电，由于该电机容量小，只能带动主扇风机，其他生产用电供应不上，通风不畅，造成局部瓦斯集聚。晚上11点多，市电大电网来电，井下不久就发生了瓦斯爆炸事故。12矿井中电气设备缺陷(1)矿井电力网络缺陷一般是电力电缆绝缘受潮、损坏，发生单相接地或相间短路，引发电气火花或电缆爆炸，导致瓦斯爆炸事故。实例2：2000年11月，湖北省某煤矿发生瓦斯爆炸事故。调查组专家认为，该煤矿为高瓦斯矿，当时事故原因：矿井顶板垮塌，砸破电缆绝缘层，电线着地引发电气火花，导致瓦斯燃烧而引起爆炸。2004年8月28日，广东省某煤矿发生井下电缆爆炸事故，引发井下大火。(2)矿井内变配电设备缺陷一般矿井中的配电变压器或配电装置，不具备防爆性能，因运行环境恶劣，造成单相对地绝缘或相间绝缘降低、破坏，产生电气火花，引爆瓦斯。实例3：2004年湖南“329”瓦斯爆炸事故直接原因查明。专家们认为：电气火花发生在该煤矿矿井下配电室出口处巷道边的变压器接线处。井下被淹后导致井中环境变化，而矿井中原有的电器没有更换为防爆电器，潮湿使接线盒内三相电气间绝缘降低，最终导致线间绝缘破坏产生电火花，引爆瓦斯。(3)矿井照明用电设备缺陷，多为照明灯具炸裂，引爆瓦斯实例4：2000年11月，广东某煤窑发生的瓦斯爆炸，其原因是矿主违章越界作业，死巷内瓦斯浓度过高，当天灯泡爆炸发生火花，引起瓦斯爆炸。2004年8月n日，江西某煤矿发生瓦斯爆炸。事故原因查明：独眼井开采，没有形成通风系统，引起井下瓦斯大量集聚达到爆炸浓度，遇到灯爆炸产生电气火源，引起瓦斯爆炸的重大责任事故o (4)矿井动力用电气设备缺陷多为掘煤用的不具备防爆性能的电动机、扇风机、潜水泵等漏电引起瓦斯爆炸。实例5：2004年3月17日，云南发生一起重大瓦斯爆炸事故，查明矿井由于独眼开采，导致瓦斯超标，采用漏电的不具备防爆性能的潜水泵下并排水引起瓦斯爆炸。另外，矿井电气作业不遵守安全操作规程，如煤矿在未做好相关安全措施情况下，擅自停、送电，或明电下井，电工带电安装电气设备、或井下作业工人擅自打开矿灯灯罩、不安全使用照明灯具等，均会产生电气火花引发瓦斯爆炸事故o 2矿难事故的诸多启示除了上述不完全统计的情况，另外我国某省组织分析了1980年2002年这23年间该省煤矿3人以上重大伤亡事故情况。3人以上瓦斯事故死亡2563人，占建国以来3人以上瓦斯事故死亡人数的818。在这些瓦斯爆炸事故中，造成瓦斯气体集聚的原因主要有10种。其中：因煤矿停电、停风造成的事故占496。因此，消灭煤矿瓦斯爆炸事故，首先要保证煤矿市电电源或自备电源的供电可靠，以解决主要扇风机的停电、停风问题，以消除矿井内瓦斯气体的集聚、超标。再者，从上述频繁灾难的发生，我们可以看到目前煤矿在生产中还存在较普遍的安全生产问题：除了煤矿管理制度不健全、安全监管不力、安全意识淡薄、安全投入不足等间接因素外，尤为严重的是：矿井中电气设备选型、配置不合理，无防爆性能，或本身缺陷、运行性能差，产生电气火花或电气爆炸诱发煤矿瓦斯爆炸事故。由此可见，煤矿瓦斯爆炸的电气诱因十分严重，要想实现煤矿稳定的安全生产，关键在于保证供电电源可靠，消除井下瓦斯超标和配置防爆性能可靠的矿井电气产品。3大幅度降低煤矿瓦斯爆炸的电气诱因的措施31针对矿井市电电源、自备电源(发电机)供电不可靠的缺陷可将单回路市电供电网络改为双回路市电供电网络，配置性能可靠的矿井自备电源和相应的备用电源自动投入装置(BZT)，方可保证整个矿区的可靠供电。32针对矿井电力网络、变配电设备、照明灯具和动力用电设备缺陷鉴于矿井防爆安全的重要性和防爆电气产品在爆炸性气体和粉尘危险环境中应用的普及程度，应着力加强对用在该环境中的防爆电气产品强制性的监督检查，杜绝该使用防爆电气产品的却替代以普通产品。同时应加强对用户防爆电气产品的监督检查，避免以次充优或超期股役等现象的发生。另外，加强防爆电气产品标准化工作，不断提高产品标准化、系列化、通用化水平，可便于用户选型、使用。再者，应加强防爆电气产品生产、流通、使用等各环节的质量控制，以期最终做到矿井中井下作业必须配置质量合格并取得矿用产品安全标志的防爆电气产品，以构成完善的矿井防爆电气体系，做到产品的防爆结构、工艺、材质、检验均符合防爆标准的规定，如隔爆面的配合宽度或配合间隙不应超标，做到隔爆面壁厚一致；隔爆面之间不可任意加设密封垫。对外壳，特别是铸铁外壳材质需化验；做隔爆外壳的水压试验；隔爆面上的砂眼、气眼不应超标；隔爆外壳上的紧固件紧固牢靠；设置内、外接地端子；多余的进线孔设置钢质堵板。防爆电机的制造和装配质量应符合产品验收规范。矿用电机的选型、接线盒内电路的爬电距离和电气间隙、结构材料、密封材料等均应符合防爆标准要求，接线盒内应涂耐弧漆；避免绕组短路、断路现象，定子绕组装配前内部清理干净，绕组浸漆后避免漆瘤；隔爆型电机轴承传动结构及轴承隔爆结构应避免“抱轴”质量事故。隔爆面粗糙度应达到标准，注意椭圆度超差，保证其同心度；工序传递过程中保护隔爆面。在防爆电气产品应用过程中，产品选型符合安装标准，如防爆类型和隔爆型的级别、组别选择应符合相应场所及使用条件的要求；产品检查维护工作应到位；杜绝假冒伪劣、带安全隐患的产品在现场使用，如接线盒缺少紧固螺钉、电缆引人装置的密封圈无压紧装置或密封圈丢失、电动机风罩固定螺栓不全、铭牌严重腐蚀或丢失。应保证户外防爆电气产品的接线盒防水性能；产品维修后应达到原来的防爆要求。用户应了解产品维护、检修报废的标准，做到危险场所必须采用防爆电气产品。当然，国外引进的防爆电气产品需经我国防爆质检机构检验合格并取得矿用产品安全标志，才可进入我国销售流动领域。针对矿井作业人员违章用电的问题，应加强电气防爆知识宣传、培训、普及，以使矿井作业人员自觉地严格遵守矿山安全操作规程，做好防爆电气标准的贯彻落实。4结束语接连不断的煤矿瓦斯爆炸事故与电气诱因密切相关，只要我们的相关部门以及煤矿自身建立安全生产的长效机制，强化煤矿安全监察，保证供电可靠，矿井中配置质量合格的防爆电气产品，井下作业人员严格遵守安全操作规程，相信煤矿瓦斯爆炸事故的发生率会明显下降.附录2Coal mining and security, Keyword : three soft coal bed; Mine pressure show features one . The three soft coal bed on top of coal mine located pressure of study 1, located about 12,090, located in the Great West Yugou mining bureau hoisted two wells below a District East, West 2 West transport belts down, 2 mining areas in east-west border to stop a thread. located 420 m towards the average length, 100 m long trend. The second one, located stoping coal bed, Fucun Group in Shanxi Erdiexi bottom. Because coal bed sediment environment and the impact of later tectonic movements, uneven thickness, larger changes, stoping coal in the context of a thin belt presence (vice alley in de 40180 m above, the thickness of a coal bed 01. 6 m), to bring a certain degree of difficulty stoping work. coal bed inclination to 714 meridian east, the average thickness of 4 coal bed. 62 m, the coal is of relatively for anthracite, coal is of relatively soft, low intensity and easy to run down. Direct roof for the stones, mudstone and sandy mudstone; direct-bed for the stones, axes; In direct top, - bed between local presence and pseudo - pseudo-top end, the variable quality mudstone or mudstone mostly carbon, thickness generally less than 0. 5 m. 2 mine pressurised observation content and layout mine detection point pressure is the main purpose of observing large Yugou Mining Bureau three soft coal bed guns a coal located on top of the pressure distribution pattern and advance to pressure step from the initial roof, pressure to step away from the cycle and intensity. major observational content pit props pressure, located cradles pressure. At the same time, you should also pay attention to the observation of a face, supporting macroeconomic situation changes; Watch top coal broken off after the roof and the top of the coal shed Yunyi 3 located advance pressure distribution characteristics 3. 1 observation data collation, located back alley advance wind pressure observation period, Underground daily sent people to the station pressure gauge readings recorded, measuring station located to the distance, macro-observation plane lane, alley and surrounding rock changes in the wind conditions and intense deformation measurements relating to the district, located in the distance. After calculation handling objects charts. 3. 2 advance distribution of pressure from the wind power plant Lane can finally curve, caused by coal mining is much pressure to advance work before side 34 m, 34 m at work before the side street will be located within the stope advance pressure. advance pressure peaks in the work zone before side 912 m, a significant increase in the volume of pit deformation, top Jing fence fractures increase, and sometimes a coal business, a broken cinder ended. 34 m away from the side before the work stoppage that could advance pressure from the impact of a stress stability zone. The two coal bed belonging to one of three soft instability thick coal bed, the old top to pressure evident, leading to work on stress distribution side before extended stress peaks, located far away from the district, stress concentration factor is, However, the relative proximity of the larger pit surrounding rock, to reduce the excessive stope pillars surrounding rock deformation and destruction, and give full play to the role of supporting the surrounding rock deformation control, work before the two parties within 21 m alley to advance support for. 4 coal mining located roof to pressure of 4. 1 mine coal mining is much pressure observation data collection and processing for about guns taken on the top and roof load coal mine, located cradles pressure distribution patterns, 12,090 wells located in the red flag for the use of pressure-Yaliji located cradles a half load for the site observations that after calculating the results processed figure 3-Figure 5 below. Figure 3 is the backbone of the chassis is much data to load for X-coordinate observation cycle, weighted average time to load a vertical structure coordinates. can be seen from Figure 3, located along the direction of a cyclical movement roof phenomenon cycle to pressure to step away from 19 m. Figure 4 is located opposite to the X-coordinate long to normal when the three pillars of load testing station for the average vertical coordinates. by Figure 4 shows that Coal is much more along the direction of the top (board) campaign has begun mine pressure area characteristics, the greatest pressure on the middle and upper occasions, the smallest part. 4. 2 stope mine pressure manifested by the basic law of observational data analysis stope mine pressure show the following obvious features : (1) Overall, supports early resistance do not hold power and work great. As this is much direct contact with the sphere payments Liang was named top soft coal, coupled with the roof is also very soft, in the time frames established in the early extension to be able to improve. Average power for itself in early 226. 38227. 36 kN/ to shed for resistance work rated 15. 4 %16. 8% Working resistance averaged 252. 84272. 44 kN/ to shed for resistance work rated 17. 2 %18. 5% to pressure, the maximum resistance for 372. 4 kN/ to shed, 23% rated the work of resistance. 3% The average intensity of support for the 102. 3144. 5 kN/ map. problems are caused mainly coal-bed and the top is too soft and monomer pillar inserted at the end of serious (some pillars inserted to the end of 700 mm or more), sometimes steel girder also drilled top. lower support body rigidity, limiting the ability to play a supporting. (2) In the course of supporting a payload located in the non-violent change, the pressure to show moderate and mine, to suppress evidence cycle (compared with the stratification changes evident exploitation), show a ground movement of rocks not violent. (3) to the old top of the initial pressure to step away from about 19 m, pressure to the end of the period cradles inserted a general increase in the volume, the deepest reached 95 cm; coal Pik films to serious, the deepest reach 0. 5 m; Guarding includes fractures increasing pressure to show quick to shed mine obvious. (4) roof cycle to pressure to step away from the general 612 m, with an average of 9 m. to pressure, National average load rate and peak load generally 1. 11. 3 (5) work surface, China, and three offices, located under the same basic structure resistance. This was mainly due to top coal pine broken, the roof vulnerable to collapse down, the two lane or coal, do not appear on basic export Kok Department triangular arc - top. stope roof collapse or even the whole, extraction region filled with better results. (6) roof pressure on the former than coal or coal, small, or an average of 237 coal ago. 16 kN/ to shed, or an average of 268 after coal. 52 kN/ to shed. This is mainly because on the former coal extraction region of the roof was broken up and top coal is filled with more in a market created a-bed, cradles, broken down objects, top coal composition balance system, in this system, supporting the main support coming from the top of the coal and the roof spaces. or coal, broken down by helicopter after the original space was filled with top coal deplete, and the roof to collapse down to completely backward, the original balance system is damaged, and that the plant should not only support higher top coal Additional support also in the roof above the pressure and therefore the power plant have increased. However, the side roof over a soft, with a Sui collapse, not a large overhang top, the structure will not collapse down the impact hazard. 5 knot on top of 12,090 guns a low load coal plant, located, mine pressure appeared evident. this is because the coal bed three soft coal beds, pillars inserted at the pressure seriously, cradles effectiveness has not been fully exploited; On the other hand, because the roof is much thicker, with a then - and extraction region filled with better results. In view of this, we should increase the coverage of a support cut and raise the pillars of power in the early intention to increase plant stability. Second, Coal Mine gas explosion accident electrical current incentives and measures, most of our coal upward inclination to move boring, coal makes such a partial or total removal of the dumping of the top, the reason is to use gravity to pass out of coal mining. Because of spillover coal mine gas air mass lighter than air, so gas gas in the air by buoyancy role will be along the street, dumping flows to the top, gather the top of the highest point in the pit (coal mining side) near a 5%15% size than for the gas-air mixture can be explosive gas. Therefore, coal, gas gas combined with the dumping pit top since deteriorated role. At present, Chinas coal mine ventilation methods used may not be the complete elimination of this form of burglary mixed gas, which is one of the main reasons for such coal mine gas explosion. It should be said that after the coal mine gas explosion in the relevant departments and personnel operations of a number of painful lessons learned, which has also taken some measures, but the explosion is still unabated, and this shows that in the previous incidents summed up the reasons, there are major underlying factors induced. In recent years many cases of the author on coal gas explosion accident and the cause of the accident was announced incomplete statistics, the analysis found that the coal mine gas explosion accident subjective and objective factors are manifold, but the most fundamental factor than direct two main aspects : First, the partial loss of gas concentration reached explosive limits; in the presence of one to two basis of many types of electrical equipment error or mine operation against induced electrical spark or explosion due. To the elimination of one of the parties concerned have made fruitful discussions on the following two key to the author as a result of statistics, analysis, and make the corresponding contain electrical incentives exist. 1 coal mine gas explosion accidents in coal mine explosion electrical incentives type material foundation - China coal mine gas is a gas or other carbon material, the main component of methane, lighter than air, combustion Yi, Yi explosions. Gathered in a gas concentrations in the air shaft internal combustion-supporting, electrical sparks and other fire sources in the event will be an explosion. According to the Chinese Academy of Engineering and a joint coal Information General Hospital My mine production safety situation, gaps and response issue, the Chinese original mine safety facilities serious ageing, many power equipment. Mine can not vote in safety, not only to add new equipment, the maintenance of existing equipment have also been omitted. In recent years, the author of the wrong types of electrical equipment such as incentives to the coal mine gas explosion summarized as follows : 1.1 errors mine shaft electricity power supply, power supply reliability is poor, - owned power (generators) or small models, configuration unreasonable, poor operating performance caused by the interruption of electricity, coal, gas gas utilization. 1:2004 example, a coal mine explosion in March Shanxi Province, 28 miners were killed. According to the local production safety supervision and management department said that at 18:48 on March 1, the coal city electrical grid electricity blackouts limit will be just purchased 400kW generators, the generators fully automatic rubber, but after the voltage reach 280V, 380V no longer or less than the rated voltage. Taiwan into a coal mine and the old 90kW generator power, as the small electrical capacity only to the ventilator, and other non-production