Study of Optimal Layout Based on PRA: Case in a Crude Oil Tank Farm
Fire due to sulfurized mst self-heating as ignition source in crude oil tank is by far catastrophic.The influencing factors of oxidation self-heating of sulfurized rust formed in the respiratory/safety valve equipped on tank deck consist of water content, mass of sulfurized rust, operating temperature, air flow rate and oxygen concentration.Support vector machine (SVM) technique can precisely predict the maximum temperature (Tmax) which is an indicator for pyrophoric of sulfurized rust in a specific circumstance during the oxidation self-heating progress.Compared with the defined threshold value, the maximum temperature reveals that whether the oxidation self-heating od sulfurized rust can lead to the primary accident or not.Moreover, the frequency of primary accident (tank fire) can be calculated with usage of Monte Carlo simulations based on the probability density function of the five influencing factors mentioned above.For a crude oil tank, the major physical damage to the surrounding vessels and workers is heat radiation rather overpressure and missile projection.Considering the worst case scenario which is the vapor-liquid interface covered with fire, the thermal flux of a receiver at a specified distance away from the center of the circle which the cylinder tank projects on the ground is calculated.Corresponding to the critical thermal flux of a receiver, the critical horizontal distance between the tank and receiver can be obtained.Assuming the probability of damage risk at the edge of tank and at the critical horizontal distance are separately 0 and 1, the probability of damage risk at a given horizontal distance which is less than the critical one can be presented by the integration of thermal flux equation.As a crude oil tank farm including more than one tank, the thermal flux of a person at an arbitrary point is the superposition of thermal radiation from different tanks, for the optimization of space collocation and of evacuation route, only combined thermal flux from two tanks to a receiver is applied to analysis reasonably.The handling process for this phenomenon is same as the way one tank to one receiver.Finally, the space collocation and of evacuation route based on risk-minimum rule is obtained with considering the thermal radiation due to the tank fire ignited by the oxidation self-heating of sulfurized rust.The handling method for the mentioned problem enhances the inherent safety of chemical industry and reduces property loss and casualty to some degree.It also supplies a new path to design evacuation routes based on the minimum of risk.
crude oil tank farm layout optimization probability risk analysis tank fire thermal radiation
DOU Zhan LIULongfei JIANG Juncheng Ahmed MEBARKI NI Lei
Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, College of Urban Construction and Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, College of Urban Construction and University Paris-Est, Laboratoire Modelisation et Simulation Multi Echelle, MSME (UMR 8208 CNRS), 5
国际会议
The 2016 International Symposium on Safety Science and Technology(2016安全科学与技术国际会议)
昆明
英文
664-671
2016-10-17（万方平台首次上网日期，不代表论文的发表时间）