摘要
总结现有危险化学品泄漏扩散机理,在此基础上用Visual Basic6.0开发可视化的危险化学品泄漏扩散模拟软件。该软件能够根据事故情景用图形的方式给出事故不同程度的危害范围,并且可依据不同风向和扩散范围改变模拟图的方向和大小以达到自适应目的。同时对所编制软件进行数值验证和与ALOHA比较验证。
The present paper is aimed at introducing a numerical simulation model of the regional division for the hazardous chemicals accidents. Based on the study results of the current hazardous chemicals release and dispersion mechanism, we have developed a visual hazardous chemicals release and dispersion simulation software by means of Visual Basic 6.0. According to the different accident scenarios, we have used the software to display different dangerous scopes by graphics. With the help of the coordinate transformation, the graphic can be changed to face the different wind directions. In order to dis- play the different sizes of dispersion graphs on the screen, we have introduced adaptive coefficient, which helps to change the sizes of the grids to satisfy the actual dispersion areas automatically. Thus, the software can achieve the adaptive purpose. Meanwhile, the software can be tested from the two aspects to examine its accuracy and relia- bility, One is manual numerical verification, while the other is com- parison with ALOHA. In manual numerical verification aspect, the concentrations of the three random points were nearly the same after the software calculation and manual numerical calculation. In com- parison with ALOHA aspect, after simulating the given accident by the software and ALOHA, the relative errors of the dangerous scopes were reduced to less than 3% . And the relative errors of the three random-points＇ concentrations were reduced to less than 11%. Therefore, different choices of physical and chemical properties of liquid ammonia used in the two softwares and the errors existed in the atmospheric stability itseff, were to be the two main reasons for caus- ing absolute and relative errors. The software simulation results were reliable enough, and it could be used for the simulation for the actual accident scenario. And, finally, with the reliable results of computer simulation, it would not have to blindly evacuate the nearby residents who were not in the dangerous areas.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2011年第4期197-201,共5页
Journal of Safety and Environment
关键词
安全工程
安全模拟与安全仿真学
数值模拟
危险化学品
泄漏
大气扩散
safety engineering
safety simulation and safety emulation
numerical simulation
hazardous chemical
release
atmospheric dispersion
