CAJ | 학술논문

外浮顶罐油气泄漏扩散规律的研究对其油品蒸发损耗的评估及潜在危险的控制都具有重要意义。外浮顶罐油品蒸发损耗的一个主要途径是油气从浮盘边圈密封处泄漏。为此，对单浮盘环形密封圈的油气泄漏规律进行了数值模拟与实验对比，同时考察了罐直径、浮盘位置和风速大小对浮盘上风压分布的影响。研究结果表明：（1）油气泄漏的模拟结果与实验相吻合。（2）浮盘距罐顶的距离h与罐直径D的比值大于1/4时，垂直风向的浮盘两侧和上风侧最易泄漏。（3）浮盘上的风压分布规律受罐直径影响不大，但浮盘上方空间的高径比h/D和风速大小对其有较大影响。h/D较大时，浮盘中部的风压较低；h/D较小时，浮盘上风侧的风压较低；h/D在1/20～1/2范围内时，浮盘上下风侧风压均为负压；浮盘上的压差随着h/D比值的减小而增大。最后建议API外浮顶罐油气蒸发损耗评估公式中考虑h/D比值的影响。
외부정관유기설루확산규률적연구대기유품증발손모적평고급잠재위험적공제도구유중요의의。외부정관유품증발손모적일개주요도경시유기종부반변권밀봉처설루。위차，대단부반배형밀봉권적유기설루규률진행료수치모의여실험대비，동시고찰료관직경、부반위치화풍속대소대부반상풍압분포적영향。연구결과표명：（1）유기설루적모의결과여실험상문합。（2）부반거관정적거리h여관직경D적비치대우1/4시，수직풍향적부반량측화상풍측최역설루。（3）부반상적풍압분포규률수관직경영향불대，단부반상방공간적고경비h/D화풍속대소대기유교대영향。h/D교대시，부반중부적풍압교저；h/D교소시，부반상풍측적풍압교저；h/D재1/20～1/2범위내시，부반상하풍측풍압균위부압；부반상적압차수착h/D비치적감소이증대。최후건의API외부정관유기증발손모평고공식중고필h/D비치적영향。
It is important to investigate the oil vapor leakage and emission from external floating-roof tanks for the loss evaluation and potential danger control. The oil vapor leakage from the annular space between the rim and the tank shell is one of the major sources for the evaporation loss. The vapor leakages from the rim of the single-tray floating roof are simulated numerically using FLUENT and measured experimentally. The effects of tank diameter, roof level and wind speedv on the pressure distribution above the roof surface are investigated. The results are as follows. (1) Numerical results agree with the experimental data. (2) When the ratio of the distanceh between floating-roof and tank top to the tank diameterD,h/D, is greater than 1/4, the vapor is more likely to leak from the two opposite sides of the annular space perpendicular to wind direction and the side of the annular space in the upwind. (3) Tank diameter has little effect on the pressure distribution above the roof surface, whileh/D andv affect the pressure distribution. Largerh/Dlowers the wind pressure of roof center, and smallerh/D lowers the upwind pressure above the roof. Whenh/D varies from 1/20 to 1/2, the upwind and downwind pressures are negative, and with the decrease ofh/D, the differential pressure above the roof increases. API loss formula for external floating-roof tank is recommended to consider the effect of ratioh/D to improve the accuracy in loss evaluation.