Feasibility of monitoring a mine fan by using interaction of vibrator system

The impeller of turbo machinery is a typical nonlinear multi-oscillator system.The vibration of each module is coupling, including fluid-solid coupling of the blade.The subject of our investigation was a KDF-5 mine fan for which we analyzed air vibration signals and axial vibration signals by using correlation dimension analysis under five variable working conditions.The results indicate that their correlation dimension curves show a uniform trend.That is to say, the characteristics of the variation signals of the integral structure are correlated and mutually embodied.It proves that it is possible to monitor the working state of a mine fan by coupling the vibration signals and air vibration signals for these are more sensitive in representing the status of the impeller system.

Development of testing techniques for mine fan performance

Three progressive stages of testing techniques are elaborated,which are en-tirely manual operating,taking separate instruments testing and computer program con-trolling.The testing method and principle are detailed based on the testing process formeteorological parameters,air pressure,air quality and rotating velocity.And every testingtechnique is analyzed.Finally, the technique outlook is viewed.All this plays a leading rolein development of the testing techniques.

Stress-strain State and Vibration Frequencies of Blades of the Main Mine Fan Impeller

The paper discusses geometrical characteristics and strength parameters of fan blades equipped with replaceable active part it end ended to improve the fan adjustability owing to replacement or removal of the active part, which allows the fan to maintain a wide range of ventilation modes.

Performance evaluation methods and instrumentation for mine ventilation fans

Ventilation fans are one of the most important pieces of equipment in coal mines. Their performance plays an important role in the safety of staff and production. Given the actual requirements of coal mine production,we instituted a research project on the measurement methods of key performance parameters such as wind pressure,amount of ventilation and power. At the end a virtual instrument for mine ventilation fans performance evaluation was developed using a USB interface. The practical performance and analytical results of our experiments show that it is feasible,reliable and effective to use the proposed instrumentation for mine ventilation performance evaluation.

Stability of multiple fans in mine ventilation networks

In large mines,single fan is usually not enough to ventilate all the working areas.Single mine-fan approach cannot be directly applied to multiple-fan networks because the present of multiple pressures and air quantities associated with each fan in the network.Accordingly,each fan in a multiple-fan system has its own mine characteristic curve,or a subsystem curve.Under some consideration,the conventional concept of a mine characteristic curve of a single-fan system can be directly extended to that of a particular fan within a multiple-fan system.In this paper the mutual effect of the fans on each other and their effect on the stability of the ventilation network were investigated by Hardy Cross algorithm combined with a switching-parameters technique.To show the validity and reliability of this algorithm,the stability of the ventilation system of Abu-Tartur Mine(one of the largest underground mine in Egypt)has been studied.

基于实际生产工艺的煤矿9-19型离心风机优化分析

为进一步探究煤矿离心风机可能优化路径,以9-19型离心风机为研究对象,针对其叶轮模型的不利力学环境,通过建模和有限元分析方法,明确其叶片部位需要重点优化,并以叶片后盘部位优化加固模式予以优化。结果显示,优化后的叶轮模型在应力分布情况上显著改善,且基本不存在共振等风险,表明此次优化设计工作取得一定进展,在实际工作中也将具有潜在应用价值。

煤矿筒仓局部通风机节能降噪技术研究

近年来,随着技术的发展以及人们对绿色、低碳生产理念的追求,通过技术手段实现筒仓局部通风机的节能降噪成为研究热点。优化筒仓通风机的设计,减少能源浪费和环境污染,不仅可以提高煤矿的经济效益,还可以为矿工提供一个更为舒适和安全的工作环境。主要探讨了局部通风机的工作原理,同时针对其实际运行中存在的高能耗和噪声问题,探讨了变频技术、优化设计和采用节能材料等节能技术,以及采用吸声材料、采用隔音罩和动平衡技术等降噪技术,旨在为煤矿筒仓局部通风机节能降噪改造提供一定的思路。

基于三维仿真的四季气候变化对矿井通风影响规律研究

四季气候变化影响着矿井内自然风压的大小和方向,若将自然风压作为动力合理运用,有益于矿井通风系统节能减排。眼前山铁矿井下通风系统在初期设计中对自然风压的利用较少,且风机选型方面未将四季气候变化的因素考虑其中。本文对眼前山地区四季气候变化对矿井通风的影响规律进行研究,并以此规律指导井下基站风机进行优化。通过三维仿真系统建立井下通风系统模型,模拟眼前山地区一年四季气候条件,通过风流模拟计算进风井口处的自然风压大小和方向,结果表明眼前山地区夏季日间,1号主进风井、2号主进风井处会出现与矿井通风方向反向的自然风压,其余季节进风井处自然风压均有利于通风,其中,冬季自然风压可利用价值最大,且冬季风机风压较夏季风机风压显著增大,使得冬季总进风量增加4.46%;建议针对主机站2-3基站、2-4基站的K-8-19型风机和主机站2-15基站、2-16基站的K-8-23型风机进行工况点调节,在冬季时期将主扇叶片安装角由35°调整至30°;根据眼前山地区的四季气候变化规律适时调整主要通风机工况点,对自然风压有效利用,解决了矿井通风系统冬季风量过剩的问题,实现了以更加节能的方式满足矿井通风需要。

基于PLC的矿井通风机变频集控系统的设计与研究

针对煤矿通风系统主通风机传统起动与运行方式存在的起动电流较大、运行效率与可靠性低、设备运行能耗大等问题,采用PLC控制及变频调速控制技术对主通风机控制系统进行改造设计。系统以双冗余PLC为控制核心、变频器为调速装置,通过建立由工业以太网组成的通信网络完成井上井下互联互通,实现对主通风机远程集中监控、电机变频调速及输出风量自适调节等智能化功能。在实际应用中,系统可有效改善井下瓦斯浓度及稳定风量,实现节能降耗。

煤矿掘进工作面局部通风机设备选型计算分析

煤矿掘进面由诸多模块构成,通风系统是其中较为重要的一个模块,用于井下与并上气体的交换,为煤矿开采创造良好的作业环境。所以,煤矿开采过程中,应根据煤矿掘进工作面具体情况,选取最佳的通风机设备。基于此,以某煤矿工程作为研究对象,通过对煤矿基本情况与掘进工作面通风系统现状的简单介绍,进而对矿井通风系统风量进行了计算,并以此为基础,选择相应的通风系统设备,最后验证了该通风系统设备的应用效果。通过验证可以发现,该设备符合某煤矿掘进工作面通风要求,可将该方案进行应用。

煤矿通风机叶片无损检测技术的标准应用研究

无损检测技术是煤矿通风机叶片检测的常用技术,可及时发现通风机叶片故障,为煤矿通风机的运行维护提供依据。文章对煤矿通风机叶片各种无损检测技术的应用进行分析,并对无损检测技术在煤矿通风机叶片检测中的标准应用措施进行深入研究,为煤矿通风机叶片无损质量检测工作的规范开展提供参考依据。

通风系统改造优化及应用

随着煤矿开采作业持续进行,采区风量需求大幅提高,为保障矿井生产安全稳定,需对通风系统进行改造优化。以山西省某煤矿为实例,分析计算矿井风量与阻力,针对主风机选型、布设等提出优化改造方案,最终通过实践证明优化效果显著。

煤矿主通风机不停风倒机控制技术研究

针对煤矿通风系统主备风机传统倒机方式供风稳定性与连续性差、备用风机启动失败率高、存在通风失稳风险等问题,研究了煤矿主通风机稳风倒机技术,从煤矿通风系统大滞后、非线性特点的角度出发,提出了一种基于粒子群优化的模糊PID不停风倒机控制方案,并设计了相应系统。该系统通过优化算法自适应调节风门开合角度,可有效缩短倒机时间,提高备用风机启动成功率,实现倒机过程井下通风不中断,确保通风系统全过程安全稳定运行。

局部通风机性能改进及其在煤矿通风系统中的应用

本文主要讨论了局部通风机性能的改进及其在煤矿通风系统中的应用。首先介绍了局部通风机的基本工作原理,并分析了局部通风机性能评价指标的选择与分析。然后探讨了局部通风机性能改进的方法与途径,包括设计优化、流动特性模拟与优化及材料选择与工艺改进。接着讨论了局部通风机在煤矿通风系统中的位置与配置优化,及对煤矿通风系统性能的影响。随后分析了局部通风机性能改进对煤矿安全生产的意义,并通过实际应用进行了分析。最后讨论了局部通风机性能改进的挑战与解决方案。

Evaluating the impact of auxiliary fan practices on localised subsurface ventilation

Mines are continually expanding in size and depth,leading to an increased reliance on localised subsurface ventilation systems.The use of underground auxiliary fans is a favoured method to increase and control airflow in working areas.However,the effectiveness of auxiliary fans in this regard is not clear.This paper evaluated the performance of these underground fan systems in four different South African deeplevel gold mines.A total auxiliary fan system efficiency of 5%was found across six systems,with the average fan efficiency of 33 fans at 38%.The results showed that these fans deviate significantly from their design operating points.Therefore,there are significant shortcomings in current underground fan practices.Our detailed investigations led to the conclusion that the assemblage of underground auxiliary fan systems results in significant energy inefficiencies.Therefore,maintaining good underground fan practice such as optimal fan selection,ducting design and maintenance is crucial for the efficacy of a mine ventilation network.

Use of booster fans in underground coal mining to advantage

A booster fan is an underground main fan which is installed in series with a main surface fan and used to boost the air pressure of the ventilation to overcome mine resistance.Currently booster fans are used in several major coal mining countries including the United Kingdom,Australia,Poland and China.In the United States booster fans are prohibited in coal mines although they are used in several metal and non-metal mines.A study has been undertaken to examine alternatives for ventilating an underground room and pillar coal mine system.A feasibility study of a hypothetical situation has shown that current ventilation facilities are incapable of fulfilling mine air requirements in the future due to increased seam methane levels.A current ventilation network model has been prepared and projected to a mine five years plan."Ventsim visual" software simulations of different possible ventilation options have been conducted in which varying methane levels are found at working faces.The software can also undertake financial simulations and project present value total costs for the options under study.Several scenarios for improving the ventilation situation such as improving main surface fans,adding intake shafts,adding exhaust shafts and utilizing booster fans have been examined.After taking into account the total capital and operating costs for the five years mine plan the booster fan scenarios are recommended as being the best alternatives for further serious consideration by the mine.The optimum option is a properly sized and installed booster fan system that can be used to create safe work conditions,maintain adequate air quantity with lowest cost,generate a reduction in energy consumption and decrease mine system air leakage.

变叶片安装角对旋风机气固两相流特性研究

针对某实际运行的矿用对旋风机叶片存在的磨损问题,采用SST k-ω湍流模型和Finnie磨损模型,对不同叶片安装角下风机内部气固两相流场进行了数值模拟研究。首先,选择风机静压、功率和效率为评价指标,进行了风机性能试验,对数值计算方法和模型的准确性进行了验证;然后,根据设计的6种叶片安装角方案,对叶片压力面的磨损特征和气固两相流风机流场的分布规律进行了分析;最后,对不同叶片安装角下气固两相流风机的性能进行了对比,确定了具有最佳抗磨效果和最优风机性能的叶片安装角方案。研究结果表明:相比于原始的叶片安装角,增大后级安装角后的叶片面平均磨损率降低了6.0×10^(-8)kg/(m^(2)·s);同时,增大后级安装角能够有效地缓解后级叶片前缘和尾缘处的分离涡现象,提高风机的性能,达到叶片抗磨的目的。

玲珑金矿九曲分矿通风系统优化研究

针对玲珑金矿深部通风不良导致的高温热害问题,通过现场调研、核算总风量、机站优化设置、新增通风井巷工程等手段,确定了玲珑金矿九曲分矿通风系统优化方案。研究结果表明:通过新掘-470~-620 m水平九曲矿段回风井工程,形成主井、副井进风,东、西两翼及中部55勘探线倒段回风井回风的“两进三回”通风方式,同时在九曲矿段-620 m中段(东翼),大开头矿段-620 m中段(西翼)、中部-620 m中段55勘探线回风井设置回风机站,经Ventsim三维通风模拟软件解算,系统总风量达到204.7 m^(3)/s,能满足深部通风要求。研究成果为矿区深部系统优化奠定了基础。

矿用主要通风机远程监控方案设计

基于矿井主要通风机现场情况对远程监控系统方案进行设计,该监控方案通过多个传感器监测主要通风机运行参数并将参数传输给PLC(S7-200),上位机对监测参数进行分析,对异常参数发出预警,提高主要通风机运行保证能力;同时布置视频监控系统实时掌握主要通风机运行画面。经实际应用结果表明,该远程监控系统运行平稳,可实现主要通风机运行监控。