净化煤焦油沥青的中间相热转化研究

本文用煤岩学方法研究离心法净化煤焦油沥青中间相的热转化过程,考察与评价了离心处理条件、原生与次生喹啉不溶物组成等对中间相热转化的影响。     

河南省下二叠统山西组二_1煤中硫的分布规律和成因

本文详细探讨了河南省下二叠统山西组二_1煤中硫的分布规律、赋存状态及成因,指出煤中硫的含量主要受泥炭沼泽介质性质和成煤植物的控制。当介质为半咸水时最易形成高黄铁矿硫煤,淡水介质时往往形成低黄铁矿硫煤。煤中有机硫的含量主要受成煤植物控制,当成煤植物为辉木类时易形成高有机硫煤:以石松类为主时,有机硫含量极低。最后从微生物地球化学角度论述了煤中黄铁矿的形成机制,建立了煤中黄铁矿的成因模式。     

放顶煤综采采空区“三带”的理论计算与观测分析

本文应用非线性渗流理论建立采空区流场二维平面非线性渗流流函数微分方程,利用有限元技术求得各结点上的流函数值和各单元上的流速v_x、v_y、v_o在此基础上,得到采空区风流流线和等速线。依据煤自燃所对应的风速上下限,得到放顶煤综采采空区不自燃带、可能自燃带和窒息带的形态和范围。对采空区矿压显现、采空区温度变化及氧浓度变化进行的观测表明,理论计算与实际观测所得结果基本一致。     

正断层上盘防水煤柱合理宽度的研究

本文根据正断层的破裂特点和煤柱的渗透性变化规律,将断层面法线方向上的防水煤柱分为断层裂隙带、弹性核和屈服带三个区域,在此基础上建立了断层上盘防水煤柱宽度的计算公式。     

利用神木煤研制优质气相吸附活性炭的试验研究

本文研究了低温预氧化时的通入空气量、炭化湿度、炭化时间与炭化料微晶结构的关系,分析了预氧化、炭化和活化工艺参数对活性炭性能的影响,指出了用神木煤研制优质气相吸咐炭,采用低温预氧化、缓慢炭化和水蒸气活化法工艺是可行的。     

Stability control of gob-side entry retained under the gob with close distance coal seams

In multi-seam mining, the interlayer rock strata between the upper coal seam(UCS) and the lower coal seam(LCS) appear damage and strength weakening after mining the UCS. Ground stability control of the gob-side entry retaining(GER) under the gob with close distance coal seams(CDCS) is faced with difficulties due to little attention to GER under this condition. This paper focuses on surrounding rock stability control and technical parameters design for GER under the gob with CDCS. The floor rock strata damage characteristics after mining the UCS is first evaluated and the damage factor of the interlayer rock strata below the UCS is also determined. Then, a structural mechanics model of GER surrounding rock is set up to obtain the main design parameters of the side-roadway backfill body(SBB) including the maximum and minimum SBB width calculation formula. The optimal SBB width and the water-to-cement ratio of high water quick-setting material(HWQM) to construct the SBB are determined as 1.2 m and 1.5:1.0,respectively. Finally, engineering trial tests of GER are successfully carried out at #5210 track transportation roadway of Xingwu Colliery. Research results can guide GER design under similar mining and geological conditions.     

The influence of mining factors on seismic activity during longwall mining of a coal seam

In this article an attempt to determine the influence of mining factors on the seismic activity during the longwall mining of the upper layer of coal seam no. 405/2 in one of the Polish hard coal mines in the Upper Silesian Coal Basin was conducted. Two longwall panels were mined in analogous geological conditions and based on the same mining system and technology. However, there was significant difference with regards to the mining factors, which was reflected in the observed seismic activity. Some tools used in mining seismology were applied to illustrate the aforementioned influence of mining factors, e.g. the frequency-energy distribution, the frequency-magnitude distribution, the 2 D distribution of released seismic energy, the relationship between released seismic energy and the volume of mined coal, the Benioff strain release, and the Gutenberg-Richter(GR) b coefficient distribution(b is the proportion between high and low energy tremors). Concerning the Benioff strain release, a new solution, based on the slope of a fitted line in a moving time window, is proposed.     

煤矸石制备聚合氯化铝铁钙与应用试验研究

以煤矸石为原料,经过高温焙烧、酸浸、聚合、熟化等过程制备了高效无机高分子絮凝剂聚合氯化铝铁钙（PAFCC）,通过单因素试验研究了PAFCC制备条件对浊度、COD和UV₂₅₄去除率的影响。试验结果表明,PAFCC最佳聚合条件为pH值2、聚合温度60℃、聚合时间5 h、在40℃下熟化28 h。混凝结果表明：制备的PAFCC对浊度有极好的去除效果,达95.70%,同时,对COD、UV₂₅₄也有一定的去除效果,去除率分别达到47.51%、45.98%。炼化废水混凝结果表明：PAFCC对浊度和总磷有较好的去除效果,同时,对COD及氨氮也有一定的去除效果,效果明显优于传统PAC。     

天然气管网经济效益研究与系统设计

我国天然气管网已经形成全国性供气网络,管网在保证全国供气的可靠性与连续性等方面具有重要意义。然而,管网存在诸多问题有待解决:天然气调度复杂、输配任务繁重;管网进出气点、分输点、管线、输配气场站数量众多;管径规格、压力等级差异大,现有调配制度仍以进出气平衡为主要标准,未能充分考虑用户、输气效益等问题。因此,研究了各管网公司管输费计算、最佳输气路线计算,并引入改进的单纯型法优化现有输气方案,同时开发出了相应软件便于工作人员使用,为该管网安全可靠经济的输气性运营提供支撑。     

侧向土体影响下盾构隧道引起上覆管线变形

目前盾构隧道开挖对邻近管线影响的理论研究一般基于Winkler地基模型和Pasternak地基模型,较少考虑精度更高的Kerr地基模型及管线侧向土体影响对管线变形的约束作用. 将管线简化成Euler-Bernoulli梁搁置在Kerr地基模型上,利用差分法得到盾构隧道引起上覆管线竖向位移半解析解,在此基础上进一步推导考虑管线侧向土体影响的Kerr地基模型差分解. 通过与已有工程案例和离心机数据对比,验证Kerr地基模型相比于其他地基模型的优越性,也验证了考虑管线侧向土体影响的Kerr地基模型计算结果更加符合实测数据. 参数分析表明, 随着隧道开挖地层损失率和土体弹性模量的增大,管线的竖向位移和弯矩均增大;随着管线与隧道夹角的增大,管线的竖向位移和弯矩均减小.