矿井通风网络图

矿井通风网络图是矿井通风管理的重要图件之一 ,也是进行矿井通风系统模拟、网络解算、通风系统优化的基础资料 .矿井通风网络图属于图论的范畴 ,是对矿井通风系统的抽象 .本文结合网络图论的有关知识 ,对矿井通风网络图进行了图形和画法分析 ,并进一步指出了矿井通风网络图与矿井通风系统图的区别 ,这对于绘制矿井通风网络图、指导矿井通风管理、确保安全生产具有实际意义     

矿井通风网络图

矿井通风网络图是矿井通风管理的重要图件之一,也是进行矿井通风系统模拟、网络解算、通风系统优化的基础资料.矿井通风网络图属于图论的范畴,是对矿井通风系统的抽象本文结合网络图论的有关知识,对矿井通风网络图进行了图形和画法分析,并进一步指出了矿井通风网络图与矿井通风系统图的区别,这对于绘制矿井通风网络图、指导矿井通风管理、确保安全生产具有实际意义.     

高大平房仓机械通风量优化数值模拟

选择合适的机械通风量有利于提高通风效果和减少能耗.以某平房仓为研究对象,在粮堆内热湿耦合传递数学模型的基础上,运用CFD数值模拟方法,以机械通风单位通风量作为变量,选取《储粮机械通风技术规程》中不同通风目的的两个临界通风量作为上限和下限,依次再选取8个不同单位通风量值,对这10个不同值进行数值模拟预测.针对两个临界通风量值产生的通风效果,分别从温度和粮食湿基水分进行对比分析,得出机械通风量与有效通风时间的变化曲线,研究表明降温时间与单位通风量大小大致呈反比,但非绝对的线性关系.     

地下停车场无风道透导通风系统性能及经济性分析

分析了无风道诱导风机射流通风的基本原理,对地下停车场采用无风道诱导通风系统与采用传统通风系统的方式进行比较,结合工程实例对两种通风系统进行经济性分析.结果表明无风道诱导通风系统用于地下停车场通风具有较大的优势,结论为地下停车场通风系统设计提供参考依据.     

浅圆仓不同运行方式对粮堆通风调温效果影响

浅圆仓在粮食储藏中有着广阔的应用前景,探究垂直通风与径向通风系统不同运行方式的通风降温效果,有助于为粮食的安全储存提供支持。文章以浅圆仓内粮堆(大豆)为研究对象,通过有限体积法,数值模拟了3种不同风道在正压上行通风和负压下行通风为期14 d的调温过程,获得了粮堆内部的气流和温度分布情况,并对比分析了通风降温速率、均匀性与能耗等。结果表明：各通风方式下均无通风死角,形式差异导致流向与涡团的位置差异;垂直风道正、负压方式下通风7 d后仓内无高温区域,其他两种风道出现高温区域,14 d时各种工况均无高温区域;只有径向风道的负压通风的降温速率与最终温度低于正压通风;径向风道的通风均匀性优于其他两种风道,正压通风的均匀性优于负压通风的;而正压通风的能耗普遍低于负压通风。     

封闭式粮仓通风控制中的智能算法研究

对于封闭式粮仓,及时通风是防止粮食霉变,确保粮食储藏安全的一项重要措施.目前大多数粮库仍采用基于经验的人工通风方式,造成大量的无效通风甚至有害通风.针对这些问题,采用基于D-S证据理论的多源信息融合技术,提出并实现了一种智能通风算法.试验结果和实际应用表明,应用该智能通风算法取得的通风效果大大优于人工通风方式.     

复杂通风网络简化过程与原理研究

为研究复杂通风网络拓扑的快速自动简化,需要研究复杂通风网络拓扑的简化过程与原理.研究了复杂通风系统网络拓扑结构特征和复杂拓扑通风网络的相互转换过程与原理,提出了最简准等效拓扑通风网络、最简模糊拓扑通风网络等概念,获得了各种拓扑通风网络的相互转换原理与方法,进一步丰富和完善了复杂通风网络拓扑理论.结果表明:应用本成果分析和自动绘制三河尖煤矿通风网络图时效率提高了28.30%.     

矿井通风难易程度评价指标及分级方法

矿井通风难易程度的科学评价是准确调整和优化矿井通风系统的重要依据,至今仍未形成公认的评价指标与方法.本文深入分析了现有矿井通风难易程度评价方法失效的本质原因,从影响矿井通风难易程度的根本因素出发,提出了适用于矿井通风难易程度的评价指标——矿井通风阻力,系统论述了采用矿井通风阻力作为评价矿井通风难易程度基准指标的科学性和...     

浅圆仓横向和垂直通风数值模拟对比研究

目前,我国浅圆仓储粮主要采用垂直通风方式对粮食进行冷却降温,但是垂直通风产生的温度、水分分层现象明显,因此进行浅圆仓横向和垂直通风的数值模拟对比,可以研究横向通风的可行性,为浅圆仓机械通风系统提供更多选择。文章以浅圆仓为研究对象,采用计算流体动力学的方法,研究在横向通风方式下,粮堆内温度、速度分布的变化规律,并对同样条件下垂直通风进行了数值模拟,对比2种通风方式下粮堆内部的温度、速度分布变化,分析其通风均匀性、温度降低的速率以及通风阻力大小。结果表明:横向与垂直通风对浅圆仓粮堆区域的通风效果较接近,但横向通风无死角,均匀性好;与垂直通风相比,横向通风时粮仓空气区域的温度梯度更小,降温更快,通风效果更好;当装粮高度较大时,横向通风的通风阻力会明显优于垂直通风。     

不同粮种横向和竖向通风性能参数的对比研究

借助通风模拟装置,通过变频器调整风机转速、改变通风箱接口位置,实现横向通风与竖向通风的转换,在相同试验条件和粮堆不动的前提下,测定不同条件下4种粮堆的静压值,并计算出单位粮层阻力。研究表明:二次函数对单位粮层阻力的拟合度最优,幂函数次之;单位粮层阻力:压入式送风好于吸出式送风,横向通风好于竖向通风(大豆例外),竖向压入式通风好于横向吸出式通风,说明横向通风在单位粮层阻力方面并不比竖向通风更具优势。另外,还讨论了横向通风的适用范围,若应用条件不符则会影响到通风效果与通风效益,需考虑横向通风在粮库的适用性。     

遂昌金矿通风系统测定及分析

通过对金矿通风现状的全面分析,指出了目前通风系统的不足,并提出了改进建议,以利于即将进行的扩改．本研究工作对于相似矿山有一定的启发意义．     

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     

Fault Diagnosis Approach of Local Ventilation System in Coal Mines Based on Multidisciplinary Technology

In order to reduce the probability of fault occurrence of local ventilation system in coal mine and prevent gas from exceeding the standard limit, an approach incorporating the reliability analysis, rough set theory, genetic algorithm （GA）, and intelligent decision support system （IDSS） was used to establish and develop a fault diagnosis system of local ventilation in coal mine. Fault tree model was established and its reliability analysis was performed. The algorithms and software of key fault symptom and fault diagnosis rule acquiring were also analyzed and developed. Finally, a prototype system was developed and demonstrated by a mine instance. The research results indicate that the proposed approach in this paper can accurately and quickly find the fault reason in a local ventilation system of coal mines and can reduce difficulty of the fault diagnosis of the local ventilation system, which is significant to decrease gas exploding accidents in coal mines.     

Assessment Index Structure of Mine Ventilation System and Application

Based on the basic content of advanced technology, safety and reliability, and economic reasonability and the definition of mine ventilation system, 16 assessment indexes of ventilation system are put forward from the point of 8 aspects such as mine ventilation power, ventilation network, ventilation equipments, ventilation quality, ventilation monitoring, capacity of preventing and fighting disaster, ventilation consumption of power, and the capacity of ventilation system. A new assessment index system is put forward and has a good effect after being applied in coal mines.     

我校通风科研的回顾与展望

矿井通风是确保矿井安全开采的重要环节。昆明冶专积极开展矿井通风的应用研究,20世纪50年代开始风网模拟的研究,60年代进行水封爆破试验,70年代参加了排氡通风研究,80年代探索高效低耗通风方法,90年代研究集中远控,近年来致力于长独头巷道通风的研究,努力为矿山解决通风问题。回顾了50年来的发乒历程,展望节能增效、集中远控和排氡防癌技术的推广应用前景,总结取得的成绩与贡献。     

自燃煤层下行通风防火技术与展望

对我国回采工作面下行通风技术的应用状况以及下行通风对采空区煤炭自燃的抑制作用的研究工作进行了阐述，提出了回采工作而下行通风时采空区自热，点的自消原理，并论述了自燃煤层下行通风防火技术的推广应用前景。     

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 perform-ance and analytical results of our experiments show that it is feasible, reliable and effective to use the proposed instrumentation for mine ventilation performance evaluation.     

Numerical Simulation of Energy Saving Potential in Dispersing Process of Blasted Smoke in Mines

The dispersing process of the blasted smoke in underground mines by ventilation is very important for the safety of personnel, and its energy consumption is also worthy of concern. In this study, the impact of supply air flow rate on the decay process of harmful gases and fan energy, and the role of harmful gases buried by blasted pile in the smoke dispersing process is analyzed with three-dimensional numerical simulation. According to the results, air flow facilitates quick smoke dispersion and the gas emits from the blasted pile is only significant at the beginning of ventilation. It is thus recommended that large amount of air supply is taken to disperse the smoke quickly until the concentration of harmful gases reaches relevant standards, and reduce the amount of air in the remain time with frequency conversion technology to save energy. In the given study, 12 m/s air flow rate is taken for dispersing smoke and 3 m/s air flow rate is taken for the waiting time. The energy consumption for ventilation is reduced by about 50％. In addition, due to the gases in the blasted pile remains very high concentration after the dispersing process, it is recommended to keep suitable amount of ventilation in the consequent process.     

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.