LPG区火灾温度场数值模拟及防火间距研究-安全科学与工程专业毕业论文.docx

首都经济贸易大学硕士学位论文 首都经济贸易大学硕士学位论文 《LPG罐区火灾温度场数值模拟及防火间距研究》 Abstract Liquefied petroleum gas storage tank has the characteristics of inflammable and explosive．When the gas leak out,which will lead to fire and explosion accident，which result in huge economic losses， casualties，even catastrophic consequences．However,local scope of fire temperature due to the external environment factors，equipment factors，human factors and other absolute rules out factors is inevitable．Considering the safety production and economic benefits,the equipments subjected to fire damage should be evaluated according tO fitness—for—service(FFS)procedures to determine whether the equipment is suitable for service not．The temperature extremes to which the equipment Was subjected is the key factor to judge whether the structural damage material degradation happened， ln general．the temperature iS derived by the fire combustion characteristics the field devices． However,bum marks easy to be damaged due to the complexity of the fire．The fire temperature not be obtained frequently．Fire temperature field simulation of LPG tank farm based computer numerical simulation method is necessary． In this paper,theoretical analysis and simulation research were carried out to analysis main characteristics of LPG tank farm pool fire．Tank farm of liquefied petroleum gas fire model was established by PyroSim，the fire temperature field distribution of LPG tank farm was analysised by numerical simulation for dividing the heat exposure and correcting fire separation．All investigations be conclude as follows： (1)The applicability of various fire computer numerical simulation software were analyzed．The fluid dynamics model of FDS and the LES theory were introduced，the application of Mixture Fraction Combustion Model in FDS was expounded． (2)The design of LPG tank farm．Normal pressure spherical storage tanks were adopted．8 liquefied petroleum gas spherical tanks wi