【作者】 高巍；

【导师】 马恒；

【作者基本信息】 辽宁工程技术大学 ， 安全技术及工程， 2018， 硕士

【摘要】 在当代煤矿生产中,随着矿井进一步的深入开采,自然风压在通风系统中的重要性也越来越明显,不但影响矿井通风网络各巷道的风流流量,甚至还改变个别巷道的风流流向,使得整个通风系统都发生变化,从而影响矿井的正常生产。为了更方便的掌握矿井不同时刻的自然风压对通风系统的影响情况和自然风压在不同时刻的变化规律,对含自然风压的通风网络自动解算的研究是有必要的。现今对矿井自然风压的考虑仍停留在静态层次上,即需要事先实地测量各网络节点矿井气候参数,再以此计算自然风压数值,并将自然风压数值以一个固定值的形式参与到通风网络解算。然而,一旦井口气候发生变化,自然风压也会随之变化,对不同时刻自然风压的考虑就需要进行反复的实地测量,过程繁琐耗时长,对自然风压和通风系统无法做到动态掌控。因此,本文提出了一种含自然风压的通风网络自动解算来解决这一问题。本文采用图表分析、程序设计、算法论证、建模模拟等方法手段。首先,在不考虑自然风压的前提下,对通风网络进行初步分风,并以分风结果、井口大气参数和井下围岩性质参数为基础,根据热交换原理和对井下温湿度预测方法,预测出井下各点处的温湿度,然后对自然风压相关变量:压强、密度、通风阻力相互关系推导出一个函数关系式,将其应用在原有的Cross网络解算算法中,研究出一种能够实现含自然风压通风网络自动解算的新算法;最后将算法通过MATLAB软件进行程序设计,建立一个网络模型对算法的可行性进行验证。通过验证,新算法中自然风压不再以固定值的形式参与运算,而是与风量一样随着迭代不断变化直到收敛;通过接入进风井口不同时刻大气参数,模拟了在不同大气情况下自然风压与通风系统的变化情况,验证此算法的自然风压变化规律符合矿井自然风压随四季变化的一般规律。通过接入井口大气参数数据,就能预测出不同时刻井下自然风压与通风系统的变化情况,省去了实测的麻烦,该研究将有效的提高对矿井自然风压的监测效率,达到全天候全年的自动预测的目的。更多还原

【Abstract】 In the modern coal mine production,with further in-depth mining of the mine,the importance of natural ventilation pressure in the ventilation system becomes more and more obvious.It not only affects the flow of ventilation in each lane of the mine ventilation network,even changes the flow direction of the individual roadway and makes the entire ventilation system change,thus influences the normal production of the mine.In order to make it easier to grasp the impact of natural ventilation pressure to ventilation system in mine different time,and get the changing rule of natural ventilation pressure in different time,the research of ventilation network automatic calculation algorithm with natural ventilation pressure is necessary.At present,the consideration of natural ventilation pressure in the mine is still on the static level,that is,we need to measure the mine climate parameters of each network node in advance,then,calculate the natural ventilation pressure value and take natural ventilation pressure as a fixed value to participate in ventilation network calculation.Moreover,once the climate changes,natural ventilation pressure will also change,and the consideration of natural ventilation pressure at different time will need to be measured repeatedly in the field.The process is tedious and time-consuming,and natural ventilation pressure and ventilation system cannot be controlled dynamically.Therefore,this paper comes up with a ventilation network automatic calculation algorithm with natural ventilation pressure to solve this problem.This paper uses chart analysis,program design,algorithm demonstration,modeling simulation and other methods.At first,under the premise of not considering natural ventilation pressure,the preliminary distribution of ventilation of the ventilation network is carried out.Based on the results,the wellhead atmospheric parameters and the underground surrounding rock properties parameters,we predict the temperature and humidity in underground various locations according to the principle of heat exchange and the study of underground temperature and humidity prediction methods.Then we derive a functional relationship by the correlation of correlated variables including pressure,density,natural ventilation pressure,and ventilation resistance and apply it to the original Cross network calculation algorithm and develop a new algorithm to come true the ventilation network automatic calculation with natural ventilation pressure.Finally,we program the algorithm by MATLAB software,and establish a network model to verify the feasibility of the algorithm.Through the program verification,natural ventilation pressure in the new algorithm no longer participates in the operation in the form of fixed values,but is the same as the ventilation volume with the continuous change of the iteration until convergence.Through the atmospheric parameters of the access into the ventilation wellhead at different time,we simulate the change of natural ventilation pressure and ventilation system under different atmospheric conditions,and verify the algorithm of natural ventilation pressure in the mine variation law corresponds to the actual law of natural ventilation pressure in the mine during the four seasons.Therefore,through the atmospheric parameter data access wellhead input,we can predict the change of natural ventilation pressure and ventilation system at different time.It leaves out the trouble of the field measured,and the study will effectively improve the monitoring efficiency of natural ventilation pressure on mine,and achieve the goal of all-weather automatic prediction of throughout the year.更多还原