Leakage Simulation Analysis And Diffusion Model Optimization Of Hazardous Chemicals

With the industrialization developing, various unstable factors increase the quantity of global environmental problems, even causing irretrievable damage to the climate and eco-environment. Multiple environmental emergency accidents harming the security of national and people's property happen occasionally, among which toxic or harmful gases releasing or exploding disasters hold a large ratio. In our country, emergency response system about emergency air pollution incidents has achieved some development, but it also not perfect compared with developed countries. Because of lacking risk rating standard of corporate, pollution accidents, early warning response system to emergency air pollution accidents. For contaminant threshold selection it lacks details. In order to react favorably to air polluted accidents and predictive analyze specific accident consequences, it has realistic significance on disaster quantification research of hazardous chemical leak, therefore, taking emergency management through analyzing results is this paper's ultimate purpose.This article theoretically researched the leak and diffusion of dangerous chemicals, and combed the process of accident dynamic evolution according to the development direction of the liquid heavy gas tank spill leakage accidents. Through basic theoretical research, this text used ALOHA software to make numerical simulation analysis of liquid chlorine tank leakage incident. It made a detailed analysis for Diffusion range, source power and concentration 1.5km distance downwind based on different conditions of wind speed, leak amount, leak aperture and ambient temperature. On this basis, this work established diffusion range fitting formulas of different factors, which achieved the disaster scope quantitative calculation.Finally, considering the easy but less accurate calculation process of the hemisphere diffusion model, in order to make it more practical operability and practicality, we conducted parameters modification study in the windy conditions. AOLHA has high accuracy to the harm scope and risk concentration threshold prediction of sudden toxic gas leak, but the quantity of inputted parameters is too excessive to delay the process of emergent burst accidents, so this thesis utilized the simulated data of AOLHA software to adjust parameters of hemisphere diffusion model, arose a new set of more exact formula, resulting in a significant efficiency improvement on the sudden disaster emergency rescue and provided a strong basis for the emergency and rescue evacuation work of chlorine leakage accident.