基于CFD技术的LNG储罐安全阀火灾探讨  

Study the pressure relief valve fire of LNG storage tank based on CFD technology

作　　者：王鹏[1,2] 王全国[1,2] 党文义[1,2] 韩中枢[1,2] 

机构地区：[1]中国石化青岛安全工程研究院,山东青岛266071 [2]化学品安全控制国家重点实验室,山东青岛266071

出　　处：《消防科学与技术》2014年第10期1199-1201,共3页Fire Science and Technology

摘　　要：发生翻滚事故时,为防止LNG储罐超压破裂,大量的天然气通过安全阀放空,若遇点火源,则将会发生安全阀火灾。采用CFD方法对某LNG接收站储罐安全阀火灾过程进行模拟,得到温度场、热辐射场等基础数据。LNG储罐发生安全阀火灾时,火焰高度为50m,火焰最高温度达1 872K;储罐处于32kW/m2热辐射影响范围之外,因此安全阀火灾不会对储罐的混凝土外表面造成损害;罐顶部分区域处于15kW/m2热辐射影响范围内,热辐射可能对罐顶金属设备及管线造成损害,应当提高安全阀高度或在罐顶增加喷淋降温措施;地面处最大热辐射值为4.3kW/m2,行政办公楼不会受到安全阀火灾的影响。When a LNG rollover accident occurred,the pressure in the large LNG storage tanks would rise sharply.In order to prevent the storage tank form overpressure and rupture,a large number of natural gas vent through the relief valve mounted on the top of the tank.In case of an ignition source,a pressure relief valve fire will occur.Based on the computational fluid dynamics （CFD） technology,the fire processes of vent gas were simulated,and the distributions of temperature and radiation were obtained.The flame height was 50 m,the maximum flame temperature 1 872 K; the LNG tank was outside the scope of 32 kW/m2 thermal radiation; part of the tank was in the scope of 15 kW/m2 thermal radiation,and the metal equipment and pipelines on the top of LNG tank would be damaged.So the height of the pressure relief valve should be raised,otherwise spray cooling system should be installed on the roof of LNG storage tank.The maximum thermal radiation value at ground was 4.3kW/m2,so the office buildings wouldn＇t be affected by the radiation of relief valve fire.

关 键 词：LNG 储罐 翻滚事故 安全阀火灾 

分 类 号：X921[环境科学与工程—安全科学] TU998.1[建筑科学—市政工程]