Potential hazard analysis on liquefied ammonia tank release based on mathematics simulation calculation

On the basis of release analysis about liquefied ammonia, the potential hazard of liquefied ammonia reserved at normal temperature and high pressure or low temperature and low pressure condition was discussed according to two- phase release model. When liquefied ammonia released resulting from tank ruptured, release rate of liquefied ammonia reserved at normal temperature and high pressure is double of that reserved at low temperature and low pressure. So storage mode of low temperature and low pressure should be used from the point of view of the safety. For storage mode of normal temperature and high pressure, based on simulation calculation of release rate of liquefied ammonia, the influence of pipe length, pipe diameter, storage state and storage temperature in saturation condition on two-phase release rate were analyzed. The conclusions indicate that liquefied ammonia reserved at saturated condition is more dangerous than that reserved at unsaturated condition. Under the condition of saturation, release rate and potential hazard increases as storage temperature increases. For liquefied ammonia released from pipe, release rate of mass decreases as pipe length increases, but release per area rate of mass increases as pipe diameter increases.