Abstract In order to solve the problem of high dust concentration in fully mechanized top-coal caving face with difficult wetting and high dust production, a combined water injection test of “long period static pressure, alternating dynamic static pressure and static pressure in stress-affected zone” was carried out in Wangjialing Coal Mine with the engineering background of fully mechanized top-coal caving face in 20107 and combined with the previous water injection test and field actual situation. By comparing and studying the wetting and dust-reducing effects of different water injection methods and borehole spacing, the water injection process parameters suitable for this kind of coal seam are obtained. The field practice shows that the wetting radius can be increased to 3 m by the combined water injection process. In the water injection area with 5 m drilling spacing, the total dust removal efficiency can reach 57% and the respirator dust removal efficiency can reach 70%. It can effectively solve the dust hazard problem of the working face, and the effect is re-markable.

随着社会经济不断发展,工业生产和人们的日常生活不断加大了对新能源的需求.为迎合社会发展需求,我国新能源产业发展极为快速.而新能源生产过剩问题是新能源不断发展过程中所必须重视的问题.这些问题在水力发电与风力发电这种新能源发展过程中尤为突出.怎样消纳生产过剩的新能源就成为了当前社会重点关注的问题.鉴于此,本文将从影响新能源消纳的主要原因出发,并对此提出了相应的解决措施.

Drilling efficiency is low and borehole deviation happens when encountering hard rock and hard and soft sandwich during drilling through layers hole by conventional rotary drilling technique in Ulan mine.The hydraulic DTH hammer and ball tooth bit BHA is combined in construction,the efficiency does not rise obviously compared to rotary drilling.The hydraulic DTH hammer and impact type matrix PDC bit BHA is grouped afterwards,the efficiency rises by 240%,and borehole deviation slumps.The drilling parameters are analyzed and calculated to offer suggestions of reasonable parameters matching.

Based on the statistical analysis of dust concentrations in the fully mechanized heading face,discussion was made on the variation rule of dust concentration at the heading machine driver position with the height of the cutting head,and study was carried out on the dust movement and settlement in the heading face and the dust diffusion regularity in the horizontal and longitudinal sections.It came to the conclusions that the largest amount of dust generated while the heading machine cut the top coal,the dust concentration in the three areas did not uniformly distribute,and the respirable dust amounted to a large proportion and settled down difficultly.Corresponding proposes and measures for dust control were put forward according to the dust generation and movement law,and the reference basis were provided for the dust prevention and control in the fully mechanized heading face.

The development and utilization of soft coal seam is increasingly important as the coal resources become scarcer, however, the existing drilling technology is relatively backward. To meet the needs of drilling in soft coal, a new technology, which is drilling with foam in soft coal seam in Huaibei Zouzhuang mine, is discussed in this paper. In the field tests, the foam in 1# well could not form a circle. The well wall collapsed in 2# well and typical phenomenon of returning slag was observed in 4# well. This paper makes a detailed analysis for specific accidents, and carries out reasonable solutions. 3 wells of depth greater than 200m were finished in the field tests, which not only effectively increased the drilling depth in soft seam and the success rate of drilling projects, but also decreased the dust pollution in the field.

The weakly expansive nonGshrinkage grouting materials were applied to borehole sealing by water inj ection?The adj ustment of corresponding technical parameters guaranteed the sealing effect and enhanced the wetting degree of coal mass by water inj ection?The field applicaG tion showed that the total dust falling efficiency increased from 25?0 % to 40?0 % and the respirG able dust falling efficiency rose to 47?9 % from 33?2 % after borehole sealing by nonGshrinkage grouting materials at the working face.

By taking the fully mechanized heading face of 20105 auxiliary haulage way in a coal mine of Shanxi Huajin Energy Co. , Ltd. , as the research object and using the methods of numerical simulation and field measurement, the dust concentration distribution in the heading face was obtained, the dust migration law in the process of coal cutting by the tunneling machine was analyzed and summarized. Corresponding measures such as water infusion in seam, high-pressure outer water spraying, regulating duct location, dust collector and dust capture net were proposed for comprehensive dust control. The site application results showed that the total dust suppression efficiency at the operator position and in the place 10m behind the tunneling machine respectively reached 96. 2% and 98. 2%.

Analysis was made on the air flow distribution and dust concentration distribution in different distance from the air duct outlet to the heading face by taking 20105 heading face of Wangjialing Mine as the research object and by means of the numerical simulation, the variation regularity of the dust concentration with the air flow distribution in the heading face and the optimal distance from the air duct outlet to the face were obtained according to the site measuring results, and the spray pressure, flow-rate and direction of the high-pressure external spraying system on the heading machine were accordingly optimized. The practice showed that the total dust removal efficiency at the machine operator reached 88. 4%, the respirable dust removal efficiency reached 82. 6%;the total dust removal efficiency at 10m place behind the heading machine reached 89. 9%, and the respirable dust removal efficiency reached 85. 1%.

The dust producing regularity on fully mechanized caving face was analyzed,the common dust suppression measures was summarized,corresponding dust suppression measures were raised on the basis of those analysis.The result of testing shows that the dust suppression efficiency on the 1.5 m downstream of coal cutter operator is 81.25% and the dust suppression efficiency on 10 m downstream of coal cutter is 85.33% by using this dust suppression measures.

针对大采高、高风速、高产尘强度下的综放工作面采煤机的粉尘问题,进行了采煤机含尘气流控制及喷雾降尘技术的研究,并在阳煤一矿8201综放工作面进行了试验。结果表明:采用该技术后,在司机位置和机尾10 m位置的降尘效率分别为93.34%和94.42%,有效地解决了采煤机司机位置和机尾处的粉尘问题。

煤炭资源开发不可避免地造成了一系列煤矿区生态环境问题,我国亟待建立与完善煤矿区生态补偿机制,加快推进煤矿区生态环境治理与恢复.文中探讨了煤矿区生态环境治理与恢复中存在的主要问题,分析了我国现行有关煤矿区生态环境保护的法律制度存在的问题,并依据有关国家政策要求,结合不同补偿途径,提出了煤矿区生态补偿的政策建议,为有关政府部门出台相关政策提供参考依据.

分析了掘进工作面采用压入式通风时的风流分布特点及粉尘分布规律,在此基础上,针对某些高瓦斯矿井出于安全考虑限制在掘进工作面使用电动除尘器除尘的规定,进行了高瓦斯综掘工作面控、降尘工艺技术试验研究,取得了较好的降尘效果.