New processing method for fire forecast parameters

The time forecast system of coal spontaneous combustion was described based on the K J-90 mine environmental monitoring system in Hulipo Mine, Luzhou, Sichuan Province. In the system, CO and O2 sensor are added, and special-purpose microcomputer and software are equipped. By means of the system, the fluctuation laws of fire forecast parameters were observed in the process of coal-cutting, blast, exogenous mine fire and working face air quantity variation. This paper puts forward data processing method based on the Raita method.     

THE COMBUSTION CHARACTERISTICS OF A MOVABLE LINEAR FIRE SEAT IN MINE FIRES

Because of the difficulties of describing the process of combustion of underground mine fires, usually the fire seat is considered as a fixed point in the methods of mine fire computer simulation, however this is not in keeping with the feature of the distribution of the combustibles and the process of combustion in mine fires. A conception about movable linear fire seat is put forward first by the authors, together with the calculated models of the thermal decomposition rate, flame spreading velocity and the steady burning length of a linear fire seat etc. The paper also introduces the results of the application of these models.     

PRACTICAL APPLICATION AND SOME TREATMENT SKILL OF GEOTECHNICAL NUMERICAL MODELLING TECHNIQUES FOR COAL MINING DESIGN AND THE SOLUTION OF MINING PROBLEMS

This paper focuses on the following topics: (1). development and practical application of numerical modelling capabilities to investigate methods of improving coal recovery related with underground coal mining;(2), some treatment skill such as rock mass failure treatment, model calibration requirements, etc.; (3). comparison between results of modelling and underground monitoring. Application shows that numerical modelling is a useful tool for investigation of many coal mining design problems, in both major and minor roles. Modelling can be used as an integral part of mine planning and the solution of mining problems.     

IMPACT COAL CUTTING AND TESTING

The paper analyses the stress characteristics in Iongwall face and its interaction with impact coal cutting, and puts forward the operation method for impact coal cutting. Similar material to the coat in particular mine was used to simulate the coal mass. impact coal breaking test was performed on the test rig. The traveling pattern of the impact stress wave in coal and the dynamic response of impact parameters on coal property is analyzed.     

A new numerical approach of coupled modeling for solid deformation and gas leak flow in multi-coal-seams

From the viewpoint of interaction mechanics for solid and gas, a coupled mathematical model was presented for solid coal/rock deformation and gas leak flow in parallel deformable coal seams. Numerical solutions using the SIP (Strong Implicit Procedure) method to the coupled mathematical model for double parallel coal seams were also developed in detail. Numerical simulations for the prediction of the safety range using protection layer mining were performed with experimental data from a mine with potential danger of coal/gas outbursts. Analyses show that the numerical simulation results are consistent with the measured data in situ.     

APPLICATION OF EXPERT SYSTEM BASED ON NEURAL NETWORK IN MINING THE GENTLE INCLINED THICK SEAM

This paper presents a new method for the correct selection of mining methods and prediction of main technological and economic indexes of the face in the gentle inclined thick seams with the application of the artificial neural network theory and the expert system. The theory analysis and calculating results indicate that the method is reliable, practical and precise. This method has strongly capabilities of self-study and non-linear dynamic data process. It is expected to be widely applied in the policy decision and prediction of mining technology in coal mine.     

CO2 and SO2 emission characteristics of the whole process industry chain of coal processing and utilization in China

The total coal consumption in China is on the rise.The characteristics of CO2 and SO2 emissions in the whole process of coal processing and utilization in China are worthy of study.Based on the five links of the whole process of coal production and utilization,including coal production,raw coal processing,logistics and transportation,conversion and utilization and resource utilization,this paper summarized and analyzed the energy consumption and pollutant emission sources of these five links,combined with the US Environmental Protection Agency’s AP-42 method and IPCC method,to calculate total pollutant discharge and emission factors,where the emission factors were corrected by conversion efficiency.At the same time,uncertainty analysis is performed about CO2 and SO2 emissions.The results showed that CO2 emissions were 3.657 billion tons,and emission reductions were 61 million tons,and SO2 emissions were 4,844,500 tons,and emission reductions were 10.3595 million tons in 2015.     

FUZZY CONTROLLED AUTOMATION SYSTEM FOR THE MAIN COAL BUNKER

A fuzzy control scheme is presented according to the coal quantity in the main coal bunker, this method has a good dynamic response characteristic and is suited for complex nonlinear systems. The designation of self-adopting fuzzy controller, the working principle and functions of this system are also proposed, with the hardware and the main flow diagram of this system introduced in this paper.     

Study on the forecasting and maintenance system of special railway subsidence in mine area

The fully mechanized caving coal mining under the railway in mine area will result in difficulty maintenance of railway because of great distortion and subsidence speed of ter-rene and railway. If the subsidence forecasting is incorrect and maintenance measure is not suitable in the preceding and the process of mining, the normal operation of the railway in mine area will not be ensured and perhaps the safety accident will be resulted. The railway subsidence forecasting and maintenance system for fully mechanized caving coal face are studied and developed in this connection. Based on the accurate subsidence forecasting of the terrene and railway, the maintenance measure for track and switch turnout in railway is put forward in this system.     

THE PRESENT SITUATION AND DEVELOPMENT OF THE BOLTING AND SHOTCRETING TECHNIQUE IN ROCK TUNNELING

Application of bolting and shotcreting used in Chinese coal mine underground engineering has been more than 40 years. By the end of 1993. total roadway length adopted bolting and shotcreting was over 21000km. Now, This paper describes developing and achievement of bolting and shotcreting briefly in the recent years. Meanwhile the paper puts forward solving and improving method for problems which exists in present design and construction. Final, combined with feature of coal mine, the paper puts forward some proposals about developing of bolting and shotcreting,dynamic management of both designs and construction, engineering measure and stability judgement as well.     

基于图像识别的井下早期火灾探测方法的实现

本文介绍了一种通过红外图像对火灾进行探测的方法,以图像识别技术为基础,进一步利用信息融合技术,对着火点的面积变化率、分布规律进行量化综合分析,以此形成火灾判断依据,试验证明这种方法误判率低、可靠性高。     

关于水幕消防系统设计火灾延时问题的探讨

着重讨论了水幕消防系统在不同使用场所的功能要求,并根据功能要求分别提出了其设计火灾延时,供设计人员参考。     

同家梁矿309盘区火区的综合治理

通过采取密闭、灌浆、均压相结合并以灌浆为主的方法，对同家梁矿309盘区2个火区进行综合治理，收到了良好的效果，顺利采出了火区下的近10万t煤炭。     

建筑消防设计中消防水泵接合器的几个问题

根据消防规范中设计水泵接合器的规定,结合设计的体会,阐述并探讨了水泵接合器在消防系统中的设置方式、与消防水池的距离、与室外消火栓数量的关系等具体设计方式和做法。     

新岭煤矿露天北采场火区综合治理

通过对新岭煤矿露天北采场火区的分析,制定了具体消火方案,安全措施,为安全合理开采露天发火工作面提供了技术支持与保障,保护煤炭资源,降低煤炭损失。     

煤矿井下综合防火技术的研究

为了解决恒大煤矿井下煤层易自燃、危险性大的隐患,建立了以JSG-8型矿井火灾束管监测系统为核心的监控系统及以凝胶防火、阻化剂防火为核心的灭火系统,在对井下易燃区域进行不间断防火监测的基础上实现了对突发火灾事故的快速报警和有效灭火。     

攀枝花宝鼎矿区海宝箐片区4~#煤层露头火灾综合治理

根据攀枝花宝鼎矿区海宝箐片区4#煤层露头火灾的特点和治理难点,采用以胶体防灭火技术为主,同时采用爆破、剥离、平整的有效手段对火区进行了综合治理后,火区钻孔温度和CO气体体积分数明显下降,火区燃烧特征消失,保证了周边矿井的安全生产,消除了火区带来的安全隐患,取得了显著的治理效果。     

同位素测氡法探测火源位置在柴里煤矿火区治理中的应用

介绍了使用同位素测氡法探测煤矿自燃火源位置的原理及应用效果。实践证明,该方法是解决煤矿自燃火灾治理难题的关键技术,由于投资少、精度高、软件处理直观可靠,有重要的推广价值。     

大峪煤矿矿井火灾防治措施

矿井火灾是煤矿行业的频发灾害之一,不仅会造成煤炭资源的损失和设备材料的毁坏,还有可能引发瓦斯、煤尘的爆炸,对煤矿生产运营和矿工的安全造成严重危害。结合大峪矿井火灾防治实际情况,从内因、外因两个角度开展了矿井火灾防治探讨。提出了杜绝烟草及易燃物进入井下、设置合理的防灭火设计、合理应用预防性灌浆和喷洒阻化剂、加强束管监测系统对煤层自燃情况及时进行预报、在重要区域配备温度和一氧化碳传感器、提高工作面的推进速度、对工人做好应急培训等具体措施。通过有针对性地制定符合该矿特点的防灭火技术方案,提高了防灭火技术的有效性,实现了预期的安全生产目标。     

滑移支架放顶煤工作面的防灭火

阐述了中厚煤层滑移支架放顶煤工作面上下两巷和工作面注水孔位布置、防灭火方式、灭火剂和灭火工具的选择及相关技术要求.