共查询到18条相似文献,搜索用时 140 毫秒
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为解决矿井通风系统阻力测定过程中部分巷道受限于现场测试条件而导致的风阻测不准、甚至无法测定的问题,研究了基于节点压能的风量反演风阻算法,提出使用两组风量数据及部分节点压能数据反演风阻。针对算法的病态性质,对算法病态的原因进行了分析,得出反演风阻方程系数矩阵稀疏性和通风系统拓扑结构对算法的影响是导致算法病态的两个主要原因。基于此,提出基于角联子网的风量反演风阻病态改良算法与基于贪心策略的风压传感器优化布置算法,给出了算法步骤及程序框图,能够解决风量反演风阻算法的病态问题,实现布点合理、数量较少的风压传感器的优化布置。将上述算法应用于23条分支、16个节点的通风网络,验证了所有传感器布置方案下的风量反演风阻算法,其中65. 2%的方案下的算法都是病态的。笔者应用本文提出的算法给出了角联子网划分方案及9个布点的风压传感器优化布置方案,在此基础上进行了风量反演风阻计算。结果表明:算法在实现了风压传感器优化布置的基础上,准确地反演了风阻,误差控制在10~(-4)以内。算法在现场应用时结合矿井监测监控系统,可以进一步实现实时的通风系统基础参数(风量、风压、风阻)的采集、校验、计算、存储与反馈,是矿井智能通风的基础性研究。 相似文献
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为快速地获得某矿301综放工作面通风巷道内通风风量与瓦斯流量网络解算数据,在对工作面通风系统参数测试基础上,使用CAD软件提取巷道坐标数据,运用MATLAB软件,结合图论理论、流体力学理论,编制解算程序,程序可读取巷道坐标并且自动建立工作面网络拓扑关系,并求解工作面通风和瓦斯网络解算各参数矩阵,利用Cross迭代算法解算工作面通风系统内的通风巷道通风风量和瓦斯流量解算数据。通过与现场实测数据对比,程序解算数据基本正确。模拟结果表明,MATLAB软件能快速便捷地处理工作面通风风量和瓦斯流量网络解算,并具有较高的准确性。 相似文献
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矿井主要通风机为2台4-72-11No16B离心式风机,风量小于实际所需风量,瓦斯超限。为满足矿井通风要求,经分析提出了3种改造方案。采用更换电动机提高转速增大风量的改造方案,并对通风网络适当改造,满足了矿井生产需要。 相似文献
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煤矿通风瓦斯面域化现场总线实时测控防御系统 总被引:2,自引:0,他引:2
为解决煤矿瓦斯事故中的通风、未断电等问题,开发了煤矿安全生产监测监控新技术基础体系,即煤矿通风瓦斯面域化全方位综合集成实时监测监控系统,以及神经元实时网络LonWorks现场总线煤矿安全生产监测监控技术体系,同时开发了巷道风量、风向、绝对风压传感器和风筒风量监测装置。经在西山煤电集团屯兰煤矿等70余个煤矿的推广应用,实践结果表明,该煤矿安全生产监测监控新技术可有效解决整个矿井同步实时响应、同步关联测控技术难题,以及瓦斯流动区域多级超前断电等技术难题。 相似文献
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采用矿井摩擦阻力原理和通风网络中串联、并联风量分配基本规律,精确计算确定长距离巷道贯通后的需要风量,估算贯通后巷道瓦斯浓度,以达到准确分配巷道风量,避免瓦斯超限事故发生.1302北底抽巷长2157 m,贯通后计算风量为1532 m3/min,实测风量为1759 m3/min,相差13%;贯通后巷道回风瓦斯浓度估算值为0.79%,实际瓦斯浓度为0.72%,相差9%. 相似文献
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为解决通风网络中部分巷道会无法完成通风阻力测定或测定结果不准的问题,引入节点压能解析计算方法,对已知压能的节点个数进行判别分析,给出已知节点压能个数判别式,实现在通风网络中利用两组实测风量数据与部分节点压能数据,反演所需未知巷道风阻值,进而得到较准确的巷道通风阻力值。由于测量风量比测定风阻容易得多,而且各矿井为保证安全生产均有大量风量数据,因此利用风量反演风阻可以避免实际阻力测定的繁重工作。通过实例分析,说明只要利用不同条件下通过相同巷道的两组风量数据及部分节点压能,就可以准确计算出待求巷道风阻。 相似文献
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为了提高矿井通风网络解算软件的可靠性和求解大型风网时的性能,研究了通风网络雅可比矩阵的对称特性,引入并行计算方法求雅可比矩阵与回路风量修正值。分析了牛顿法求解矿井通风网络的原理,发现并证明了通风网络雅可比矩阵的对称特性,提出用WTHXLDLWTBZT分解法求解回路风量修正值以有效减少每次迭代的时间。根据多CPU计算机的特点,研究了通风网络雅可比矩阵以及回路风量修正值方程组的并行求解模型。采用VC语言的多线程开发技术实现了通风网络的并行求解,通过两个算例验证了本模型的正确性与高效性。 相似文献
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The calculating methods for path number and path matrix of ventilation networks without unidirectional circuits were introduced,
and the inapplicability problem of the matrix algorithm to determine paths in a ventilation network with unidirectional circuit
was brought forward, and a depth-first search method based algorithm to determine path matrix by means of modifying search
strategies was discussed. The method is suitable for ventilation networks with unidirectional circuits and ventilation networks
without unidirectional circuits, moreover the complexity is less than the complexities of matrix based algorithms. A series
of methods and means to avoid and to reduce the negative effects of unidirectional circuits such as the optimum of the positions
of fan stations, the increase or de-crease of fan station numbers, the optimum regulation of network and the analysis of diagonal
structures were put forward.
Surppted by National Natural Science Fund (60772159) 相似文献
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The main objective of mine ventilation network optimization studies is to develop a reasonable method for ventilation system control that minimizes the total cost of mine ventilation. The fundamental principles for ventilation network optimization are discussed, and a multi-objective optimization model is established from the viewpoint of total cost. Furthermore, an optimization algorithm based on the airflow asymptotic calculation is presented by the hierarchical analysis of objective functions and analysis of the structure characteristics of a ventilation network. In the proposed approach, the regulated branches are determined by the directed path matrix; the optimal solution is obtained by airflow asymptotic calculation using the existing software for ventilation network analysis, and it does not need to solve the large-scale nonlinear programming problem. The results of example analysis validated the reliability of this approach. 相似文献
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The current mine safety monitoring system used can only get the air volume change of roadway placed air velocity transducers,
as this change is caused by this roadway, or for other roadway, and fault source has one point or more, which belongs to the
problem of fault source diagnosis for ventilation system. Ventilation system fault can be attributed to the variation of air
resistance of branch in the entire network. If the changes of air resistance for each branch in ventilation system are analyzed,
then it is impossible to place air velocity transducers in every branch. Therefore, the problem of the minimum quantities
and location for placing air velocity transducers should be mainly studied. The relationship of air resistance and air volume
variation of matrix method has been proposed, which can reflect the variation relationship between the air volume of the branch
and air resistance of the relevant branches. Fault roadway range library of ventilation network built to determine fault roadway
range will cause air velocity to exceed the limit. Minimum and full coverage of distribution method has been proposed, and
the concept of branch coverage degree and impact roadway range library has also been brought forword to get the macro-distribution
of air velocity transducers. 相似文献
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介绍了矿井通风网络图的基本概念以及矿井通风网络图的结构在计算机中的存储方法,对反映通风网络结构的几种矩阵,提出了应用MATLAB软件编程的具体实现方法,并给出了部分源程序。 相似文献
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山西古交矿区煤层气资源丰富,是我国煤层气重点开发区块之一。区内地质条件复杂,煤层气地质研究起步晚,尤其是对煤层气组成特征及成因方面的讨论还较匮乏,制约了煤层气开发进程。煤层气组成特征及成因与煤层气母质性质、生成机理、运移和逸散规律等密切相关,对于煤层气保存条件和分布规律的认识和煤层气资源评价具有重要意义。为揭示古交矿区煤层气化学组成特征及气体成因,采集矿区内10口煤层气井口排采气样品,开展了气体化学组分和碳、氮同位素检测,分析了煤层气中甲烷及氮气的成因;结合构造演化背景、构造形态、水文地质条件和煤芯解吸气化学组成,讨论了煤层气富氮气机理及保存条件。结果表明:古交矿区内煤层气中氮气含量偏高,为0.86%~14.13%,平均6.10%,甲烷含量在83.79%~97.57%,平均91.33%,乙烷含量在0~0.46%,平均0.09%,不含2个碳原子以上的烃类,二氧化碳含量在1.47%~4.71%,平均2.48%;煤层气属于极干气体,干燥系数(C_1/C_(1~5))为0.994 9~1,甲烷δ~(13)C值在-47.13‰~-39.26‰,平均值为-44.03‰,为有机质热解成因;氮气δ~(15 )N值在-1.16‰~-0.51‰,平均值为-0.80‰,为大气与有机质热降解混合成因,且以大气来源为主,有机成因氮气含量很少;地表水下渗与煤层发生相互作用,地表水携带的大气与煤层气发生组分交换,导致煤层气解吸、逸散,煤层含气量降低、甲烷δ~(13)C值降低、氮气含量升高。 相似文献