According to typical liquefied chlorine pipeline leakage,which is common in chemical production,the diffusion processes in different stages were simulated by using the Box model and Gauss puff model respectively.At the same time,the hazard area and degrees of influence were determined by using the intoxication accident consequences simulation techniques.The results showed that if 20 kg of liquefied chlorine leaked instantaneously,the heavy gas formed would change to neutral gas at 50 m to the leeward side.The hazard area could be divided into death zone,severe injury zone,slight injury zone,and breathe-in reaction zone.The death zone extended as far as 85 m to the leeward side,in which the death rate could reach up to 95%,and the duration of exposure should not exceed 10 min.The severe injury zone extended as far as 200 m to the leeward side,in which the death rate was 4%,and the duration of exposure should not exceed 60 min.The results of the simulation were in agreement with the consequences of such an accident caused practically.Therefore,it is reliable to simulate the accident results of unexpected leakage by choosing a suitable diffusion model and correlation parameters,and it is very important for supervising disaster reduction and salvage.
