Distribution pattern of front abutment pressure of fully-mechanized working face of soft coal isolated island

The front abutment pressure of a fully-mechanized workface of 11061 soft coal isolated island of Liangbei Coal Mine was measured and studied using a self-developed mining-induced stress monitoring syst...     

泰宁隧道大坡度斜井施工关键技术研究

以目前福建省在建的泰宁隧道为例,介绍了大坡度斜井施工过程中的成功经验,包括对掏槽方式的优化,运输组织的合理设计,设置避险车道及避险平台等,可为今后类似工程提供有力指导。     

ICP-OES法测定煤及粉煤灰中伴生锂元素

为准确测定煤及粉煤灰中伴生锂元素,采用高温灰化、硝酸-氢氟酸-高氯酸三元体系消解,电感耦合等离子体发射光谱(ICP-OES)法测定煤及粉煤灰中伴生锂元素。结果表明,通过对灰样分解方法、射频功率、观测高度、分析谱线和观测方式的优选,无需基体匹配,即可实现煤和粉煤灰中伴生锂元素的测定。该方法的煤及粉煤灰中锂的检出限分别为0.01、0.03μg/g,锂含量差异较大的3个煤样的加标回收率为92.8%~96.0%。用与粉煤灰成分相似的土壤国家标准物质GB W07405、GB W07406验证方法,测定值在标准值不确定度范围内,精密度RSD(n=12)为0.99%、0.73%。ICP-OES法测定煤及粉煤灰中伴生锂元素具有快速、简便和准确等特点,可实现锂元素的批量快速测定。     

Thermodynamic evaluation of integrated gasification combined cycle: Comparison between high‐ash and low‐ash coals

In the present study, a coal‐integrated gasification combined cycle power plant is simulated. A high‐ash coal and low‐ash coal are considered to compare the performance of the plant. The combined cycle is in typical commercial size with 450 MW capacity. The feeds are Tabas and Illinois #6 coals which approximately contain more than 30% and 10% ash and have higher heating values of 22.7 MJ/kg and 26.8 MJ/kg, respectively. Energy and exergy analyses are done by aspen plus ^® and ees , respectively. Energy analysis shows that the overall efficiencies of power plants using high‐ash and low‐ash coals are 33% and 28%, respectively. The result shows that in high‐ash case, 52 kg/s coal, 10 kg/s water, and 1050 kg/s air and in low‐ash case, 48 kg/s coal and 820 kg/s air are required for providing mentioned power, approximately. Exergy analysis shows that maximum exergy destruction is in heat recovery steam generator unit. Investigating the emissions shows that high percent of ash in the coal composition has slight effects on the IGCC pollution. Finally, from thermodynamic viewpoint, it is concluded that the high‐ash coal, like the conventional one, can be used as thermally efficient and environmentally compatible feed of IGCCs. Copyright © 2016 John Wiley & Sons, Ltd.     

煤矿地测管理信息系统的构建和开发

叙述了国内煤矿地测管理的发展历程，分析了当前煤矿地测信息的特征和问题，基于煤矿地测管理信息系统的优势，提出了煤矿地测管理信息系统的构建和开发。     

路面基层施工中摊铺技术的运用控制

结合施工经验，针对路面基层施工中摊铺技术的运用控制进行了介绍，包括摊铺机基准线、摊铺进度、操作等方面的控制措施，并着重阐述了碾压时应注意事项及接缝施工中出现问题后的对策，以确保路面平整度，从而提高路面工程质量。     

涡流技术在降低水煤浆燃烧产物中有毒物质的应用

为了在试验台和半工业性试验时,确定水煤浆燃烧过程中释放的气体中有害气体的质量浓度,采用涡流燃烧工艺,对水煤浆燃烧时释放气体的成分进行了试验研究。结果表明:采用涡流燃烧工艺,由于化学不完全燃烧减少,气体释放物中的CO含量随燃烧室温度提高而降低,NOx含量甚至低于标准值。这主要是因为涡流燃烧室燃料燃烧温度相对不高;喷射水煤浆的颗粒在燃烧层停留时间长,可以完全燃烧。该水煤浆燃烧工艺可以减少有害物质向大气的释放。     

高瓦斯矿井采煤工作面开切眼掘进支护的优化与施工

用ZLJ1100钻机进行超前瓦斯探测并确定安全可施工后,采用分次截割、掘进支护。瓦斯监控系统的传感器紧跟掘进迎头,以便地面监控系统能够随时掌握瓦斯浓度,确保安全。掘进过程中如顶板破碎、岩层薄、易离层垮落时,掘进机每刀进尺350mm,掘进一个锚杆排距立即锚网索支护巷。道分两次掘进完成,首先掘进远离工作面的一半断面,将开切眼半边巷道掘进至设计位置后,掘进机退回来,再将剩余的巷道进行掘进刷帮处理。     

Rib stability:A way forward for safe coal extraction in India

Ensuring rib stability during pillar extraction is of prime importance in bord and pillar(BP) method of underground coal mining with caving. Rib stability has been assessed here by way of assessing factor of safety(FOS), a ratio of the strength of rib to stress on it. Earlier formulations for rib stability when applied to case studies gave very low FOS value suggesting significant ground control problems, which were contrary to the field observations. This has necessitated the need to revisit the concept of rib stability. The stress coming on the rib is estimated with the use of numerical modeling technique using the FLAC~(3D) software. The methodology of assessing rib-stability with the help of suggested rib-strength formulation has been validated at eight Indian coal mines. The outcome of this study finds relevance and importance in ensuring underground coal liquidation with improved safety and conservation.     

煤炭试验室常见仪器故障浅谈

概述了煤炭试验室常规锤式破碎机、密闭式研磨机、电子天平、干燥箱、箱式电阻炉、库仑测硫仪、自动量热仪等设备故障、产生用的原因及解决办法