受外界大气压力变化的影响，矿井密闭空间出现“呼吸”现象，造成密闭空间内各种气体浓度发生变化。归纳了影响矿井密闭空间内各种气体浓度变化的主要因素，并进行了相关定性分析；在综合考虑主要影响因素的前提下，采用理想气体状态方程与质量守恒关系式，推导了密闭空间内各种气体浓度随时间变化的数学模型；通过假设的各种不同初始条件的算例，对模型的模拟计算结果及输出进行了分析与验证。分析结果表明，该模型具有形式简洁，适用性强，求解速度快，计算结果精度高等优点，是辅助考察密闭空间内气体变化规律的有效方法。%“Breathing” phenomenon often appears in a sealed space of a mine due to the influence of the atmospheric pressure changes, which cause the concentration change of different kinds of gases. In this paper, the main influence factors which might cause the concentration change of different kinds of gases in the sealed space of a mine were summed up and the qualitative analysis was made on them;on the premise of comprehensively considering the main influence factors, a mathematical model of the concentration change of different kinds of gases in the sealed space with the time was derived by using the ideal gas-state equation and the mass-conservation relation expression; and the calculation results and outputs which were simulated by the model were analyzed and validated with various kinds of assumed initial conditions. The results showed that this model has the advantages of simple mathematical form, strong applicability, high speed and precise algorithm for the equation solution and so on, so it is an effective auxiliary method for investigating the change law of gas concentrations in the sealed space of a mine.
展开▼
