Reason for Explosion of Buffer Tank of a Liquefied Natural Gas Bus
-
摘要: 某液化天然气公交车发生故障后，关闭其气瓶截止阀，供气系统出现管道冰冻、天然气泄漏现象。用常温自然水对管道进行除冰时供气系统中的缓冲罐发生爆炸。采用化学成分测试，显微组织、断口形貌观察以及应力校核等方法，对缓冲罐的爆炸原因进行了分析。结果表明：采用常温水除冰时液化天然气发生快速相变，导致系统内压力急剧升高并超过缓冲罐的爆炸压力，从而引发缓冲罐爆炸；建议在缓冲罐顶部加装二级安全阀，同时为安全阀设置排空管，通过排空管泄压来有效降低缓冲罐爆炸的风险。Abstract: After breakdown of a liquefied natural gas bus, the cut-off valve of the gas cylinder was closed.And then the gas supply system experienced pipeline freezing and natural gas leakage.The buffer tank in the gas supply system exploded when the pipeline was deiced with normal temperature natural water.The explosion reason for the buffer tank was analyzed by chemical composition test, microstructure and fracture morphology observation, and stress checking.The results show that the liquefied natural gas experienced rapid phase transition during the deicing with normal temperature water, leading to sharply increased pressure in the system.When the pressure exceeded the explosion pressure of the buffer tank, the buffer tank exploded.It was suggested to install a secondary safety valve on the top of the buffer tank, and to set a vent pipe for the safety valve.The risk of explosion of the buffer tank could be effectively reduced by venting the pressure through the vent pipe.
-
Keywords:
- liquefied natural gas bus /
- buffer tank /
- explosion /
- rapid phase transition
-
-
[1] 温永刚,陈运文,樊栓狮,等.LNG汽车技术发展及其推广应用前景[J].石油与天然气化工,2013,42(3):257-260. WEN Y G,CHEN Y W,FAN S S,et al.Development of LNG vehicles technology and its prospect of popularization and application[J].Chemical Engineering of Oil & Gas,2013,42(3):257-260.
[2] FANG P,CHEN Y.A review on gas supply system of liquefied natural gas vehicle[J].International Journal of Materials,Mechanics and Manufacturing,2019,7(1):55-58.
[3] 陆瑞轮.LNG客车供气系统的安装设计[J].汽车零部件,2013(2):84-86. LU R L.Assembly design of bus LNG supply system[J].Automobile Parts,2013(2):84-86.
[4] KHAN M I,YASMIN T,KHAN N B.Safety issues associated with the use and operation of natural gas vehicles:learning from accidents in Pakistan[J].Journal of the Brazilian Society of Mechanical Sciences and Engineering,2016,38(8):2481-2497.
[5] 由宏新,刘培启,孔闯,等.车载LNG气瓶尾端支撑结构传热比较[J].压力容器,2017,34(10):20-26. YOU H X,LIU P Q,KONG C,et al.Comparison of heat transfer between end of vehicle LNG cylinder[J].Pressure Vessel Technology,2017,34(10):20-26.
[6] PLANAS E,PASTOR E,CASAL J,et al.Analysis of the boiling liquid expanding vapor explosion (BLEVE)of a liquefied natural gas road tanker:The Zarzalico accident[J].Journal of Loss Prevention in the Process Industries,2015,34:127-138.
[7] HORVAT A.CFD methodology for simulation of LNG spills and rapid phase transition (RPT)[J].Process Safety and Environmental Protection,2018,120:358-369.
[8] 许彦,刘迎来,聂向晖,等.小口径薄壁钢管爆炸压力预测[J].油气储运,2017,36(11):1265-1269. XU Y,LIU Y L,NIE X H,et al.Prediction on the burst pressure of small diameter and thin wall steel pipe[J].Oil & Gas Storage and Transportation,2017,36(11):1265-1269.
[9] LABOUREUR D,BIRK A M,BUCHLIN J M,et al.A closer look at BLEVE overpressure[J].Process Safety and Environmental Protection,2015,95:159-171.
计量
- 文章访问数: 4
- HTML全文浏览量: 0
- PDF下载量: 2
下载:
