液氨储罐机械完整性与泄漏特性研究

Research on Mechanical Integrity and Leakage Characteristics of Liquid Ammonia Storage Tanks

基于PHAST软件建立了液氨储罐机械完整性破坏泄漏模型,研究了泄漏孔孔径尺寸、孔径高度、储罐液位高度、压力和环境风速变化对泄漏速度和液氨浓度分布的影响。结果表明:随着孔径尺寸、储罐压力的增大,液氨泄漏速度明显升高,孔径高度、液位高度、环境风速对液氨泄漏速度无明显影响;液氨泄漏浓度随着下风距离的增加先急剧升高至最高点,而后缓慢下降至0ppm。随着泄漏孔径尺寸、孔径高度的增加,液氨泄漏浓度峰值随之变大,环境风速、液位高度、储罐压力对液氨浓度变化影响很小。

Based on PHAST software,the leakage model of a liquid ammonia storage tank with damaged mechanical integrity was established,and the influence of changes in aperture size,aperture height,liquid height,ambient wind speed and tank pressure on the leakage rate and ammonia concentration distribution were studied.The results show that,with the increase of the aperture size and the pressure of the storage tank,the leakage rate of liquid ammonia increases significantly,and the aperture height,liquid height and ambient wind speed have no significant effect on the leakage rate of the liquid ammonia.The ammonia leakage concentration first rises sharply to the highest point with the increase of the leeward distance and then slowly decreases to 0ppm.With the increase of the leakage aperture size and aperture height,the peak ammonia leakage concentration increases accordingly.The environmental wind speed,liquid height and tank pressure have little effect on the change of ammonia concentration.