复杂山区地形水利水电液氨施工泄漏研究

Study of complex mountainous terrain ammonia leak in hydropower project

水电工程中液氨泄漏扩散对周围居民的危害很大,疏散区域划分成为重要的防护措施,但在复杂地形条件下确立准确的疏散区域成为难题。为解决这一难题,通过现场调查所得数据,采用大涡模拟方法对泄漏气体扩散进行模拟,分析氨的泄漏扩散在大气中的扩散规律,研究泄漏气体的扩散动力学演化过程及影响范围,计算泄漏事故中不同时间段影响范围,得出时间序列上的爆炸危险区域和有毒气体影响区域,最后总结分析制定安全防护距离的影响因素,为周边居民安全防护策略提供参考。

Diffusion of ammonia leaks in the hydropower project is very harmful to the surrounding residents. Evacuation of zoning has become an important protective measure, but in complex terrain conditions, how to set up an accurate evacuation region becomes a problem. To solve this problem, with data collected through on-site survey, large eddy simulations of the leaking gas diffusion is used, the laws of leakage of ammonia diffusion in the atmos- phere is researched. Through studying leakage of gas diffusion kinetics evolution and Sphere of influence, calculat- ing leak in the affected areas at different time, explosion danger zone and toxic gases affect regional in time series is derived. At last conclude from analysis of the factors of developing Safety Distance, provide protection strategy reference to the surrounding residents.