梁北煤矿主井风流反向原因分析及控制

在对新龙矿业集团公司梁北煤矿的矿井通风阻力测定和自然风压测量的基础上,找出梁北煤矿2007年1月气温突降后所引起的主井风流反向的主要原因,推导出导致风流反向的基本条件,提出在副井至-550 m运输石门之间增加调节设施以增大副井的风阻、增大主要通风机机械风压、在主井下安装压风机人为增大主井的机械风压、减少主井附近热源、对主井的风流进行降温处理和对副井的进风流进行预热以减少主副井之间的风流平均密度差等防止风流反向的控制措施,从而使主井恢复正常的进风状态,消除了矿井安全生产的严重隐患.     

梁北煤矿主井风流反向原因分析及控制

在对新龙矿业集团公司梁北煤矿的矿井通风阻力测定和自然风压测量的基础上,找出梁北煤矿2007年1月气温突降后所引起的主井风流反向的主要原因,推导出导致风流反向的基本条件,提出在副井至-550 m运输石门之间增加调节设施以增大副井的风阻、增大主要通风机机械风压、在主井下安装压风机人为增大主井的机械风压、减少主井附近热源、对主井的风流进行降温处理和对副井的进风流进行预热以减少主副井之间的风流平均密度差等防止风流反向的控制措施,从而使主井恢复正常的进风状态,消除了矿井安全生产的严重隐患.     

四平矿通风系统安全评价与分析

从矿井通风系统、进回风井筒数量及各采区分布、通风系统工艺流程、矿井风量分配四方面对矿井通风系统危险源进行了全面分析;主要建立了矿井通风系统的通风系统预先危险性分析表,提出了综合评判评价通风系统的理论及构想,最后给出了综合评价方法在矿井中的应用实例。     

杨村煤矿通风系统优化改造研究

为解决杨村煤矿通风系统出现的通风巷道阻力大和北翼采区需风量大幅增加等问题,采用了现场调查测试的方法,对杨村煤矿通风阻力进行了现场实测,找出了矿井的阻力分布规律,发现南、北翼公共进风段和回风段阻力较高。根据矿井的发展规划和当前通风系统存在的问题,提出了四种井下降阻改造方案。应用通风模拟结算软件MVENT,分别对四种改造方案进行通风系统网络模拟解算,综合分析确定最优的改造方案。根据模拟结算结果,方案4扩修-273轨道运输大巷,并且北翼采区风量向南翼分流,风量为1 000 m~3/min,完全满足《煤矿井工开采通风技术条件》所规定的安全要求,综合分析后确定为杨村煤矿最优降阻方案。     

多风井矿井通风系统优化改造技术研究

针对淮南新庄孜煤矿多风井矿井通风系统现状及存在问题,通过矿井通风系统阻力分布和风量分配的研究,结合矿井主通风机性能曲线,编制了矿井通风基础网络图,分析了影响大二号风井系统主通风机不稳定运行的原因,结合新庄孜煤矿2009～2020年的生产规划,提出了多风井通风系统改造调整方案,并进行了复杂矿井通风网络计算机模拟解算,在满足矿井安全生产要求的基础上,进行优化改造方案的分析比较,确定了关闭大二号风井风机、原大二号系统回风并入新淮工广系统的通风系统优化改造方案.多风井矿井通风系统优化改造实践证明,优化了矿井通风网络;消除了大二号主通风机运行不稳定隐患,充分发挥了新淮风井主通风机的潜在通风能力,矿井通风系统可靠性显著提高,实现矿井主通风机安全经济运行;取得了显著的经济效益和社会效益.     

基于通风系统的高瓦斯基建矿井巷道施工优化

基建矿井主、副（风）井贯通后,且在进入二期工程前必须形成全风压通风系统,此时,井下工程仍需采用地面局部通风机供风。由于井筒直径限制,布置的风筒数量极其有限,导致工程施工无法全面展开,严重制约了矿井的建设速度。本文以古城煤矿的建设为例,分析了施工现状存在的问题,提出了高瓦斯基建矿井的施工应充分考虑现有和未来一段时间临时通风系统的变化情况,并结合瓦斯治理工程实施方案,优化巷道施工顺序,为局部通风机入井运行及井下工程的全面开展奠定基础。     

矿井通风系统定量分析方法的研究

研究矿井通风系统的定量问题，对改善矿井的通风状况、保证矿井的安全生产以及提高矿井的经济效益均具有非常重要的意义。本文建立了矿井通风系统定量分析的递阶层次结构模型，探讨了矿井通风系统的定量分析方法，即对影响矿井通风系统的各指标因素进行其判断矩阵的构造、特征向量的求解以及思维一致性的检查。这种分析方法，可以对不同矿井的通风状况从总体上进行排序，为矿井通风状况的改善提供必要的决策依据。     

矿井通风系统定量分析方法的研究

研究矿井通风系统的定量问题，对改善矿井的通风状况、保证矿井的安全生产以及提高矿井的经济效益均具有非常重要的意义。本文建立了矿井通风系统定量分析的递阶层次结构模型，探讨了矿井通风系统的定量分析方法，即对影响矿井通风系统的各指标因素进行其判断矩阵的构造、特征向量的求解以及思维一致性的检查。这种分析方法，可以对不同矿井的通风状况从总体上进行排序，为矿井通风状况的改善提供必要的决策依据。     

矿井通风系统优化评判的模糊优选分析法

针对现有矿井通风系统优化评判方法的不足 ,提出用模糊优选分析法进行优化评判 .建立了矿井通风系统模糊优选评判的理论模型 ,开发了模糊优选评判的程序 ,并对庞庄煤矿张小楼井通风系统改造方案进行了优化评判 .研究结果对新矿井的通风系统设计或老矿井的系统改造设计具有实用价值     

新庄煤矿通风系统分析与优化改造

针对新庄煤矿在北风井贯通之前 ,一、二生产水平接替时期部分用风地点供风不足的问题 ,在矿井通风系统阻力测定所得数据的基础上 ,根据矿井的生产接替计划运用计算机通风网络解算程序对各个时期的矿井通风系统进行了分析 ,并在此基础上提出了通风系统的优化改造方案 ,对实际生产具有指导意义     

Quantifying the thermal damping effect in underground vertical shafts using the nonlinear autoregressive with external input(NARX) algorithm

As air descends the intake shaft, its infrastructure, lining and the strata will emit heat during the night when the intake air is cool and, on the contrary, will absorb heat during the day when the temperature of the air becomes greater than that of the strata. This cyclic phenomenon, also known as the "thermal damping effect" will continue throughout the year reducing the effect of surface air temperature variation. The objective of this paper is to quantify the thermal damping effect in vertical underground airways. A nonlinear autoregressive time series with external input(NARX) algorithm was used as a novel method to predict the dry-bulb temperature(Td) at the bottom of intake shafts as a function of surface air temperature. Analyses demonstrated that the artificial neural network(ANN) model could accurately predict the temperature at the bottom of a shaft. Furthermore, an attempt was made to quantify typical "damping coefficient" for both production and ventilation shafts through simple linear regression models. Comparisons between the collected climatic data and the regression-based predictions show that a simple linear regression model provides an acceptable accuracy when predicting the Tdat the bottom of intake shafts.     

R/S Analysis and its Application in the Forecast of Mine Inflows

1 Introduction As the first and foremost energy source of China, the irreplaceable role of coal will be played in the national economy for quite a long time. The hydro- geological conditions of coal mines in China are complicated: Karst water is dominant in coal mines of the Carboniferous and Permian periods in North China and of late the Permian period in South China, while alluvial water dominates the mines of the Qua- ternary period in the Huanghuai Plain. Many mining areas in China, …     

桃园煤矿通风系统优化研究

针对桃园煤矿通风能力不足,中央风井的风机玻璃钢叶片在长期使用后继续高速旋转存在着一定的安全隐患等问题,笔者对矿井通风系统进行了技术测定后,根据后期的矿井生产部署,提出了矿井通风系统优化改造方案,利用计算机对各个方案进行解网分析,并进行了经济投入与效益分析,最后提出了矿井通风系统优化改造方案.     

矿井通风复杂网路的解算

通风网路解算的计算法,多年来是国内外学者,十分关注的课题,作者对各种计算法,进行了全面的分析研究,提出对斯考德——恒斯雷法计算进行改进,使之成为计算简单,收敛速度快的最佳的计算法,通风网路十分复杂,手工计算工作量大。可将全网路分为三部分,进行分段、分段、回分段。分段计算,可减少计算工作量。文中举例论证     

矿井全风网风温预测法及其计算机程序的研究

本文开发了“全风网风量——风温联合解算法”模型及其计算机程序,用于预测矿井风温和确定矿井通风降温可行界限,为矿井选择降温方法决策提供科学手段和依据。应用该方法和程序对平顶山八矿进行风温预测,并确定出矿井通风降温可行界限,取得了良好的效果。     

Influence of longwall gateroad convergence on the process of mine ventilation network-model tests

Hard coal mines are required to constantly ventilate mine workings to ensure that the air composition is at a certain humidity and temperature level that is comfortable for underground mine workers, especially in deep deposits. All underground workings, which are part of the mine ventilation network, should be ventilated in a way that allows maintaining proper oxygen concentration not lower than 19%(by volume), and limits concentration of gases in the air such as methane, carbon monoxide or carbon dioxide.The air flow in the mine ventilation network may be disturbed due to the natural convergence(deformation) and lead to change in its original cross-section. Reducing the cross-sectional area of the mining excavation causes local resistances in the air flow and changes in aerodynamic potentials, which leads to emergency states in the mine ventilation network. This paper presents the results of numerical simulations of the influence of gateroad convergence on the ventilation process of a selected part of the mine ventilation network. The gateroad convergence was modelled with the finite element software PHASE 2.The influence of changes in the cross-sectional area of the gateroad on the ventilation process was carried out using the computational fluid dynamics software Ansys-Fluent.     

被动式建筑空气龄和热舒适度的数值分析

为研究地下室和通风井以及通风井开口面积对被动式建筑室内空气龄和热环境的影响。我们利用计算流体力学软件PHOENICS对上述情况进行模拟研究。模拟结果表明:设置地下室和通风井将有利于室内空气品质的提升和热环境的改善;建筑单独设置通风井对空气龄的影响较大,对热环境的影响较小;当通风井开口面积与横截面积之比分别为2/3、1/2、1/3时,取通风井开口面积与横截面积之比为1/2,则一楼空气龄和室内热环境为最佳。     

矿井火灾引起节流和浮力效应的理论研究

将风网中的风流视为一维可压缩流体的非定常流动，导出了矿井发生火灾时巷道内空气温度的计算式和空气非定常流动的运动方程，进而获得节流和浮力效应的计算模型。并给出了算例，采用此模型，将使矿井火灾灾变时期风流状态变化过程的研究更接近实际，还可以自动将节流和浮力效应加入网络解算模型中。     

Temperature field simulation of gob influenced by atmospheric pressure

The current temperature field model of mine gob does not take the boundary conditions of the atmospheric pressure into account, while the actual atmospheric pressure is influenced by weather, so as to produce differences between ventilation negative pressure of the working face and the negative pressure of gas drainage in gob, thus interfering the calculated results of gob temperature field. According to the characteristics of the actual air flow and temperature change in gob, a two-dimensional temperature field model of the gob was built, and the relational model between the air pressure of intake and outlet of the gob and the atmospheric pressure was established, which was introduced into the boundary conditions of temperature field to conduct calculation. By means of analysis on the simulation example, and comparison with the traditional model, the results indicate that atmospheric pressure change had notable impact on the distribution of gob temperature field. The laboratory test system of gob temperature field was constructed, and the relative error between simulated and measured value was no greater than 9.6%, which verified the effectiveness of the proposed model. This work offers theoretical basis for accurate calculation of temperature and prediction of ignition source in mine gob, and has important implications on preventing spontaneous combustion of coal.