基于数值模拟的扇形水幕阻挡稀释氯气扩散的影响因素研究

发布时间：2018-05-08 20:32

本文选题：安全工程 + 扇形水幕　；参考：《安全与环境学报》2017年01期

【摘要】：在重气储罐区内设置喷射水幕是安全隔离、控制重气泄漏后扩散和减缓事故后果严重程度的重要措施之一。为此,利用计算流体力学(CFD)模型建立了氯气泄漏扩散模型,对扇形水幕阻挡稀释氯气扩散过程进行了动态模拟及影响因素分析,分别模拟了外界风速、水幕的喷射角度、水幕距泄漏源距离、水幕流量和水幕液滴直径等参数对氯气泄漏后扩散的影响情况。结果表明,合理地设置水幕能够有效阻挡氯气的扩散、缩短危险距离和减少危害面积。在大气稳定的情况下,外界风速、水幕的喷射角度、水幕距泄漏源距离、水幕流量等参数、水幕液滴直径是影响扇形水幕阻挡氯气扩散的重要因素。其中水幕距泄漏源距离和水幕流量2个因素对阻挡稀释效果的影响比较明显,水幕距泄漏源的距离越小,水幕的动量越大,阻挡稀释效果越好,水幕流量适中时效果最好,流量过大或过小阻挡稀释效果都要差一些。因此,合理设置相关参数有利于提高水幕性能,更加有效地降低氯气泄漏事故的后果。
[Abstract]:The installation of jet water curtain in heavy gas storage tank area is one of the important measures for safety isolation, control of diffusion after heavy gas leakage and mitigation of the severity of accident consequences. For this reason, a chlorine leakage diffusion model was established by using the computational fluid dynamics (CFD) model. The dynamic simulation and the analysis of the influencing factors of the fan water curtain blocking the dilute chlorine diffusion process were carried out, respectively, and the external wind speed and the spray angle of the water curtain were simulated, respectively. The influence of the parameters such as the distance from the water curtain to the leakage source, the water curtain flow rate and the diameter of the water curtain liquid droplet on the diffusion of chlorine gas after the leakage. The results show that the reasonable setting of water curtain can effectively prevent the diffusion of chlorine gas, shorten the dangerous distance and reduce the hazard area. Under the condition of stable atmosphere, the external wind speed, the jet angle of the water curtain, the distance from the water curtain to the leakage source, the flow rate of the water curtain, and the diameter of the water curtain liquid drop are the important factors affecting the blocking of chlorine diffusion by the fan water curtain. The distance from the water curtain to the leakage source and the water curtain flow rate have obvious effects on the blocking dilution effect. The smaller the distance from the water curtain to the leakage source, the greater the momentum of the water curtain, the better the blocking dilution effect, and the best when the water curtain flow is moderate. Too large flow or too small blocking dilution effect is poor. Therefore, reasonable setting of relevant parameters can improve the performance of water curtain and reduce the consequence of chlorine leakage more effectively.
【作者单位】：南京工业大学城市建设与安全工程学院;江苏省市与工业安全重点实验室;
【基金】：江苏省普通高校研究生科研创新计划项目(CXLX13_443)
【分类号】：TQ086;TQ124.41

【相似文献】