【作者】 严冬；

【导师】 许满贵；

【作者基本信息】 西安科技大学 ， 安全技术及工程， 2011， 硕士

【摘要】 液氯扩散规律研究是液氯泄漏扩散预防控制的基础。本论文采用数值模拟分析了液氯基本特性，对泄漏扩散模型进行系统研究，得出液氯泄漏扩散的方式及影响结果，这与泄漏方式、气体特性、扩散参数及环境参数密切相关。通过对以上影响因素进行系统分析，建立了扩散的几何模型。在此基础上，设置符合本文初始状态、相似准则的网格模型，进行FLUENT模型参数选取，确定各边界条件，再对泄漏模拟所需要的控制参数设置计算，进行数值模拟。FLUENT不能对广阔区域进行详细网格划分和数值模拟，因此对大面积扩散采用ALOHA软件对在不同风速、泄漏源强度、孔径下液氯进行扩散模拟。为液氯泄漏扩散预防控制措施提供指导。主要工作和结论如下：（1）在液氯泄漏理论分析的基础上，建立了液氯泄漏扩散计算模型，对实际情况的基本假设、控制方程、参数设定进行研究，建立了液氯扩散几何模型，该模型模型涉及参数众多，针对不同环境、不同类型气体，所对应参数不一样。（2）通过FLUENT模拟，液氯泄漏在同一截面上轴心处的流速最大，离轴心越远的流速较小；压力扩散非常迅速，在泄漏孔上方Y方向和X方向极小的范围内就与大气达到了平衡，温度随时间发展，受重力影响，形成泄漏抛物线状。顺风条件下：扩散速度快，面积广，危害浓度面积小；逆风条件下：扩散速度缓慢，危害浓度面积大。（3）针对液氯扩散，采用ALOHA软件进行了不同风速、泄漏源体积、孔径液氯扩散模拟，分析了不同风速、泄漏源体积、孔径液氯扩散的规律，并对事故类型危害程度进行分析，并提出了综合液氯扩散预防控制措施。更多还原

【Abstract】 Spread of liquid chlorine leak has caused huge casualties and property losses. Ofdiffusion of liquid chlorine is liquid chlorine spill prevention and control of proliferation ofthe foundation. Through this paper the basic characteristics of chlorine and the differentdiffusion models for system analysis, the spread of liquid chlorine spill and the consequencesof the way, with the leakage of way, gas properties, diffusion parameters and environmentalparameters are closely related. On a systematic analysis of the above factors, theestablishment of the diffusion geometry. On this basis, draw the line with the requirements ofthis model grid, the FLUENT model selection to determine the boundary conditions to be set,and then the leak dispersion simulation control parameters needed to calculate and set thenumerical simulation. ALOHA software applications in different wind speed, the source ofleakage intensity, aperture under the chlorine diffusion simulation. Diffusion of chlorineleakage prevention and control measures to provide guidance.The main work and conclusions are as follows:（1）the instantaneous leak of liquid chlorine on the basis of theoretical analysis, theestablishment of a rapid diffusion of liquid chlorine leakage model, the actual situation on thebasic assumptions, equations, parameter setting, the establishment of a geometric model ofdiffusion of liquid chlorine. Since the model is a multi-parameter model, which has many ofthe specific parameters must be determined, but for different mining field, different types ofgas, the corresponding parameter is not the same.（2）FLUENT simulation, chlorine leakage in the same section on the axis at themaximum flow rate, the farther away from the axis of the velocity is relatively small; pressurespread very rapidly leaking hole in the X direction and Y direction over a very small withinreach equilibrium with the atmosphere, the temputer over time, by the effect of gravity, beganto form a leak parabola. Wind conditions: the proliferation of fast, wide area against the concentration of small size; wind conditions: slow diffusion, the concentration of hazardousarea.（3）ALOHA software simulation of the different wind speed, the source of leakagevolume, pore diffusion law of liquid chlorine, and the extent of the accident type of hazardanalysis, a comprehensive prevention and control measures for chlorine diffusion.更多还原