CAJ | 학술논문

随着世界能源紧缺现状的出现，天然气工业在我国的不断发展，液化天然气成为了一种成效卓著的储运方式，那么，随乊而来的便是液化天然气的安全问题，分层、翻滚是液化天然气在储存过程中有可能出现的一种极其危险的事故现象。通过FLUENT模拟软件对LNG储罐中不同物性参数的液化天然气在罐体漏热情况下进行数值模拟，在此乊前通过计算对大型LNG储罐漏热进行求解，将计算得到的热流密度近似取成10 W/m2，以此作为模拟时边界条件的罐壁、罐底漏热量，模拟得出翻滚发生的开始和结束时间，最后通过翻滚发生持续时间计算仅翻滚时所造成的LNG损失，约334 t，翻滚发生前，储罐内的气相空间压力梯度约为32 kPa/h，仅约20 min便会使储罐内正常操作压力超出安全阀设定压力。由此可见，液化天然气翻滚事故的发生不仅会造成液化天然气本身的一大浪费，同时也会对人身及财产安全构成巨大威胁，因此，深入研究 LNG 翻滚对社会发展具有深远意义。
수착세계능원긴결현상적출현，천연기공업재아국적불단발전，액화천연기성위료일충성효탁저적저운방식，나요，수호이래적편시액화천연기적안전문제，분층、번곤시액화천연기재저존과정중유가능출현적일충겁기위험적사고현상。통과FLUENT모의연건대LNG저관중불동물성삼수적액화천연기재관체루열정황하진행수치모의，재차호전통과계산대대형LNG저관루열진행구해，장계산득도적열류밀도근사취성10 W/m2，이차작위모의시변계조건적관벽、관저루열량，모의득출번곤발생적개시화결속시간，최후통과번곤발생지속시간계산부번곤시소조성적LNG손실，약334 t，번곤발생전，저관내적기상공간압력제도약위32 kPa/h，부약20 min편회사저관내정상조작압력초출안전벌설정압력。유차가견，액화천연기번곤사고적발생불부회조성액화천연기본신적일대낭비，동시야회대인신급재산안전구성거대위협，인차，심입연구 LNG 번곤대사회발전구유심원의의。
With emergence of the world's energy shortage situation, and the natural gas industryobtainscontinues development inChina, liquefying natural gas becomes an effective way of storage and transportation, thensafety problems inliquefying natural gasappear,stratification and rolloverareextremely dangerous accident phenomena that may occur during LNG storage.In thispaper,numerical simulation on storage tanksofliquefied natural gas with different physical parametersunder the condition ofheat leakagewas carried out byFLUENT simulation software. Beforethenumericalsimulation,heat leakage of the large LNG storage tank was calculated;calculated heat flux will be approximatelydetermined10W/m2as the heat leakage of the boundary conditions of the tank wall. Then the start time and end time of rolloccurringwas got through simulation, and finally losses was calculated only under the roll occurrenceinthe roll time, about 334t.The pressure gradient of vapor space of the tank is about32kPa/h before roll occurs, and about 20 minutes will make the normal operating pressure of the tank beyond the set pressure of safety valve. Thus, LNG rollovernot only will result in a great loss of LNG, but alsowillpose a huge threat to the safety of persons and property, so in-depth study on LNG rolloverhasa far-reaching significance on the development of society.