安家岭储煤场输煤暗道通风除尘技术应用研究

针对输煤暗道的生产工艺现状，提出了采用通风与密闭抽尘净化技术，结合转载落料点密闭干雾降尘等技术措施，实现了输煤暗道内粉尘的的综合治理，通过粉尘浓度在线监测系统进行智能化控制，实现对输煤暗道通风除尘系统的远程连续监测监控，输煤暗道转载点下风侧5 m作业人员通行的位置总粉尘浓度由380.8 mg/m3降至19.8 mg/m3，降尘效率达94.8%，呼吸性粉尘浓度从96.7 mg/m3降至8.4 mg/m3，降尘效率达91.3%，降尘效果较好，有效地解决了输煤暗道及其转载落料点的粉尘污染问题，为输煤暗道内的粉尘防治提供参考依据。     

Potential of renewable energy system utilisation at decentralised level in the state of Uttarakhand in India

ABSTRACT

Design and implementation of an effective dissemination programme for decentralised renewable energy system necessitate an accurate estimate of its utilisation potential. Hence, in this study, an attempt has been made to develop frameworks to estimate the utilisation potential of decentralised renewable energy systems in the state of Uttarakhand in India. Estimations imply large resource, technical and economic potentials of the domestic solar water heater, solar home system, solar lantern, family size biogas plant and improved biomass cookstove in Uttarakhand. With higher impact on the purchasing power of households, prevailing soft loan scheme has been found to be more appropriate than a capital subsidy for promoting the usage of decentralised renewable energy systems.     

A physically-based model for global collision avoidance in 5-axis point milling

Although 5-axis free form surface machining is commonly proposed in CAD/CAM software, several issues still need to be addressed and especially collision avoidance between the tool and the part. Indeed, advanced user skills are often required to define smooth tool axis orientations along the tool path in high speed machining. In the literature, the problem of collision avoidance is mainly treated as an iterative process based on local and global collision tests with a geometrical method. In this paper, an innovative method based on physical modeling is used to generate 5-axis collision-free smooth tool paths. In the proposed approach, the ball-end tool is considered as a rigid body moving in the 3D space on which repulsive forces, deriving from a scalar potential field attached to the check surfaces, and attractive forces are acting. A study of the check surface tessellation is carried out to ensure smooth variations of the tool axis orientation. The proposed algorithm is applied to open pocket parts such as an impeller to emphasize the effectiveness of this method to avoid collision.     

In situ electrodeposition of nickel cobalt selenides on FTO as an efficient counter electrode for dye-sensitized solar cells

Construction of transition metal selenides with high electrocatalytic performance is of significant importance, but it is still a challenge to develop the corresponding counter electrodes (CEs) by an electrodeposition technique. In the present work, nickel cobalt selenide (Ni_xCo_ySe) films are prepared in situ on fluorine-doped tin oxide (FTO) glasses through a potential reversal electrodeposition technique. The morphology and electronic structure of Ni_xCo_ySe films can be tuned by controlling the Ni/Co molar ratio in electroplating solution. Specially, Ni_xCo_ySe-6 film (the Ni/Co molar ratio of 1:1) with the optimized interaction between the Ni and Co elements displays numerous particles composed of sheets attached with nanocrystals, resulting in the more electrocatalytic active sites. Benefiting from the unique morphology and optimized synergistic effect, Ni_xCo_ySe-6 CE exhibits superior electrocatalytic activity for the triiodide reduction. Then, the dye-sensitized solar cell (DSC) fabricated by Ni_xCo_ySe-6 CE has demonstrated a power conversion efficiency (PCE) over 7.40%, which is higher than that of platinum (Pt)-based device (6.32%). Furthermore, Ni_xCo_ySe-6 array CE is also prepared by using polystyrene array as template. The PCE of the DSC with Ni_xCo_ySe-6 array CE reaches its maximum value of 7.64% and 20.9% larger than that of Pt-based device.     

Improved TARP development based upon mine specific data

The trigger action response plans(TARPs) are inherent to managing the multiple hazards such as: high gas content with multiple coal seams, high spontaneous combustion(sponcom) propensity, heat and ventilation. TARPs aim to provide assurance and guidance when the situation deviates from the original plan or there is a change conditions that could be hazardous. Over the years, learnings from various incidents has continuously required the coal operations to re-visit the TARP trigger values that were based on historic data or based on guidance values from the industry. In most cases, the background to the basis of TARP statistical data, viz., average, maximum, hourly, daily for the monitoring or sampling location is also unknown. Introduction of real-time monitoring devices to monitor the gases and airflows has provided greater understanding of the hazard scenarios and their controls. This paper analyses the carbon monoxide data from operating longwall mines and compares these with the historic trigger values to understand the changes and determine improvement opportunities while setting trigger levels in the TARPs.As an example of setting trigger values, those used in during the sealing of a panel are explored in terms of setting values based upon the sampling location and the level of risk. It is envisaged that the learning's shared herein would further enhance the understanding and management of multiple hazards in Australian coal mines.     

均衡理论在石圪台煤矿通风系统优化中的应用

随着国内矿山机械化程度的提升,新技术投入促使大采高、超长综合机械化采煤工作面涌入煤矿开采行业,这也导致井田开采面积增大,矿井通风线路增长,通风阻力增大,“以风定产”局面更为明显,给矿井通风系统管理增加了难度。在分析石圪台煤矿通风系统存在通风网络复杂、通风负压大、能耗高、内外部漏风严重等难题的基础上,基于均衡通风理论,全面梳理该矿通风网络,结合通风阻力分布及通风网络解算结果,对通风系统进行整体部署及优化,达到提高矿井风量,降低矿井通风负压、减小通风费用的目的,确保了通风系统稳定可靠。     

高山寒冷矿区通风系统的改进

酒钢镜铁山铁矿地和山寒冷山区，通风条件复杂，原设计的整体压入式大主扇通风系统没有正常运转。根据矿山具体条件，在新中段采用多级机站通风系统。本文着重介绍新系统的特点、多级机站的布置，并分析了矿山通风中存在的几个问题。     

独头工作面通风降温新方法及效果分析

在贯穿风流温度较低的矿井，可用通风的方法解决独头作业面的降温问题，并在分析常规局部通风存在诸多缺点的基础上，提出了用小型高压鼓风机与刚性轻质小断面PVC风筒配合的沐浴局部通风降温新方法，并对该方案的效果进行了分析和计算。结果表明，该 方案在理论上是可行的，并具有许多显著的优点。     

中国煤层气开发利用前景及其未来战略地位

中国煤层气资源十分丰富，埋深小于2000m的煤层气资源量为22.5万亿m^3，我国许多地区煤层气地面勘探开发和井下抽放已经迅速展开，并且取得了突破性的进展，显示了煤层气的良好的开发利用前景。随着我国能源结构的进一步的调整，天然气在一次能源消费中的比重将由目前的不到3％增加到7％，到2020年将有80～220亿m^3供需缺口，届时煤层气产量将达到220亿m^3，形成独立的煤层气产业，成为常规天然气的战略补充资源。     

基于GIS的通风安全信息系统研究

根据矿井通风安全基础理论，引用地理信息系统(GIS)技术，对煤矿通风安全信息进行分析和处理，研究开发了矿井通风安全信息系统，为煤炭生产管理部门对矿井通风安全信息的管理、查询、统计分析提供了一条新的有效的途径。