LIU Hui-hui1, GOU Rui-jun1, CHEN Ya-hong1, WANG Dong-jun2, LIU Xian-ming2
（1. School of Chemical and Environmental Engineering, North University of China, Taiyuan 030051, China;2. China Petroleum Pipeline Bureau Tianjin Design Institute, Tianjin 300457, China）
Abstract： The operating conditions of vent system for underground gas storage was introduced. The numerical simulation of the diffusion process of natural gas was conducted using process hazard analysis software tool (PHAST) with gas release velocity greater than 40 000 m3/h. The effects of release velocity, atmospheric stability and wind speed on the diffusion area, flash fire, explosion and spray fire of natural gas were analyzed. The results show that the higher release velocity is, the bigger explosive area is; the stabler atmosphere is, the less natural gas diffuses; the lower wind speed is, the less natural gas diffuses, and the lower diffusion speed is, the bigger dangerous area is. Moreover, wind speed also has an effect on flash fire and heat radiation. In order to ensure safety of vent process of natural gas storage, the release velocity should be controlled and atmospheric conditions should be considered at the same time.
Key words： gas diffusion; release velocity; explosive area; atmospheric stability
CLD number： TE88Document code： A
Article ID： 1674-8042（2015）01-0089-07 doi： 10.3969/j.issn.1674-8042.2015.01.016
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储气库放空系统影响因素分析
刘慧慧1， 苟瑞君1， 陈亚红1， 王东军2， 刘贤明2
（1. 中北大学 化工与环境学院， 山西 太原 030051； 2. 中国石油天然气管道局天津设计院， 天津 300457）
摘要:本文介绍了储气库放空系统工况， 运用PHAST软件对放空速率大于4×104 m3/h的天然气扩散过程进行了定量模拟， 研究了放空速率、大气稳定度和风速对天然气扩散范围、闪火、爆炸和喷射火的影响。研究表明：放空速率越大， 可燃气体爆炸范围越大；大气稳定度越高， 天然气扩散越慢；风速越小， 天然气扩散越慢；天然气扩散越慢， 危险区域越大；同时， 风速对闪火和辐射强度也有一定的影响。因此， 在放空时应限制放空速率， 同时要考虑环境因素对扩散的影响， 以确保气库安全。
关键词:天然气扩散； 放空速率； 易燃易爆区域； 大气稳定度
引用格式：LIU Hui-hui, GOU Rui-jun, CHEN Ya-hong, et al. Analysis of factors affecting vent system for underground gas storage. Journal of Measurement Science and Instrumentation, 2015, 6(1)： 89-95. ［doi： 10.3969／j.issn.1674-8042.2015.01.016］
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