氧气安全阀出口排气管设计

Design of Discharge Pipe of Oxygen Safety Valve

结合传统安全阀喷管理论,对氧气安全阀泄放时的气体动力学过程进行了描述。研究了氧气安全阀半开式排放结构的的气体动力学参数的计算方法,表征了排气管中氧气压力、流速随排气管配管长度及公称直径的变化关系,发现小管径的排气管超过一定配管长度后,304不锈钢已无法满足氧气在冲击场合流速免除的要求。为工程设计人员选型排气管尺寸和材质提供了理论依据,进一步确保氧气管道工程设计的本质安全。

The gas dynamics of oxygen safety valve discharge process was described from the view of traditional nozzle theory.The titled discharge pipe of oxygen safety valve was defined as the semi-open discharge installation and the calculation formulae of oxygen gas dynamic parameters were investigated.The effects of the length and nominal diameter of discharge pipe on oxygen pressure and velocity were discussed.The results revealed that the 304 stainless steel was unable to be used as exempt materials in impingement sites while the length of discharge pipe exceeded a certain extent.The engineering designer can choose the metal and diameter of discharge pipe according to the above mentioned theory and further ensure the inherent safety of oxygen pipe system.