三相分离器安全阀火灾泄放模拟计算研究

Study of Three-phase Separator Safety Valve Relief Simulation and Calculation at Fire

三相分离器安全阀火灾泄放常用的模拟计算方法有稳态迭代模拟计算法和PSV Plus半动态闪蒸法两种,这两种方法存在迭代计算步长受限和人为设定闪蒸单元的问题,导致安全阀泄放最大峰值出现错峰和削峰现象,为此开发了一种三相分离器HYSYS动态模拟计算法。对三种方法进行对比分析表明:计算结果上,三种方法计算出的安全阀尺寸相同;闪蒸迭代次数从大到小依次为HYSYS动态模拟、PSV Plus半动态闪蒸、稳态迭代模拟计算;计算精度上,HYSYS动态模拟无次数限制,可以避免前两种方法由于人为设定闪蒸单元造成的错峰和峰值削平现象,结果更为准确,因此推荐使用HYSYS动态模拟法进行安全阀火灾定尺计算。

There are two commonly used simulation methods for fire relief of three-phase separator safety valve:steady-state iterative simulation method and PSV Plus semi-dynamic flash method.These two methods have the problems of iterative calculation step size limitation and artificial setting of flash unit,resulting in the phenomenon of wrong peak and peak cutting of the maximum peak value of relief valve.Therefore,a new HYSYS dynamic simulation method for three-phase separator is developed.After comparing and analyzing three methods,some conclusions are drawn.The safety valve size is the same as these three methods.HYSYS dynamic simulation has the largest number of iteration,which is more than PSV Plus semi-dynamic flash,and steady state iterative simulation requires the least number of iterations.In terms of calculation accuracy,HYSYS dynamic simulation has no limit on the number of iterations,which can avoid the phenomenon of the wrong peak and peak reduction caused by the artificial setting flash unit in the first two methods,and the results are more accurate.Therefore,it is recommended to use HYSYS dynamic simulation method to calculate the fire scale of relief valve.