摘要
为预防甲烷泄爆引发的外部爆炸,首先,利用Simtec软件数值模拟不同点火位置的泄爆过程,设置前端点火、中心点火和后端点火3种典型点火位置的不同模型;然后,观察不同点火位置下泄爆过程中的二次爆炸现象;最后,分析模拟结果数据。结果表明:泄爆面的设置可实现较好的泄压效果,但泄爆过程会诱导外部二次爆炸产生,需重点关注和防控;当泄爆口处测点6出现由二次爆炸引起的第2次峰值时,容器内部测点的压力值达到峰值附近;点火位置直接影响泄爆过程中泄放出的未燃甲烷气体的量,进而影响泄爆容器外部的二次爆炸强度,导致后端点火二次爆炸最强,中心点火次之,前端点火最弱;点火位置越靠近泄爆口,外部二次爆炸的强度越弱,故泄爆口应设置在距易点火区域较近的位置。
In order to prevent external explosion induced by methane explosion venting,numerical simulation of explosion venting process was carried out by using Simtec software for different ignition positions,including front ignition,central ignition and rear ignition. Then,phenomena of secondary explosion were observed and simulation data were analyzed. The results show that better " pressure relief" effect can be achieved by setting the rupture disc,but explosion venting induces secondary explosion outside vessels, which needs to be focused on and prevented. Pressure of measuring points inside containers will approach to peak value when the second peak value caused by secondary explosion occurs at point 6 in explosion vent hole. Ignition position directly affects amount of unburned methane released during explosion venting,and thus impacts secondary explosion intensity. As a result,secondary explosion comes as the strongest for the case with rear ignition,followed by central ignition and front ignition which is the weakest one. The closer it is to explosion vent,the weaker external secondary explosion intensity will be. Therefore,explosion vent should be located close to the areas prone to have an ignition source.
作者
马秋菊
邵俊程
万孟赛
王乐耕
王伟
MA Qiuju;SHAO Juncheng;WAN Mengsai;WANG Legeng;Wang Wei(State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology-Beijing,Beijing 100083,China;Shanghai Fire Research Institute,Ministry of Emergency Management,Shanghai 200032,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2021年第9期90-98,共9页
China Safety Science Journal
基金
消防应急救援装备应急管理部重点实验室开放课题(2020XFZB15)
煤炭资源与安全开采国家重点实验室开放基金资助(SKLCRSM19KFA11)
中央高校基本科研业务费专项资金资助(2021YQAQ05)
上海市青年科技启明星计划项目(20QB1401000)。
关键词
点火位置
容器外部
二次爆炸
泄爆
峰值压力
ignition position
outside of vessel
secondary explosion
explosion venting
peak pressure
