Study On The Screening Of Hazards And Domino Effect Risk In Chemical Industry Area

The high risk of petroleum industry made major accidents happened frequently which domino effect was often the key factor to cause major casualties.huge property losses and environmental pollution.Based on this background.the quantitative analysis of domino effect is particularly important.First of all,in the aspect of risk source selection of chemical industry zone.three indexes will be set up respectively,which were fire and explosion indexes based on the quantity,nature and state of hazardous substances,the risk index of domino effect considered the domino effect under the condition of terrorist attack and its failure threshold,and the terrorist attack index,so as to the risk source screening index of the chemical industry area was constructed comprehensively.The order of all tanks was Z105>Z101>Z103>Z106>Z104>Z102>Z201>Z202>Z203>Z204>Z205>Z206>Z303>Z304>Z301>Z302>Z305.It can be seen that V105 was the most dangerous in the tank farm,followed by V101;V201 was the most dangerous in tank group 2,and V303 was the most dangerous in tank group 3;the tank of group 1 was more prone to risk than in other tank groups,and the tank of group 3 was relatively safe.Then,in the process of domino effect propagation,dynamic Bayesian method was used to analyze the mechanism of domino effect from the time and space dimensions.An atmospheric and vacuum distillation unit commonly used in petrochemical enterprises was selected as a case.Through the calculation of the possible accident types and accident coverage of hydrogen storage tank,LPG storage tank,gasoline storage tank and reaction tower in the unit,the LPG storage tank with high risk was selected as the unit of the initial event,and the cause of failure and the probability of fire and explosion accidents of LPG storage tank were calculated by using the event tree method.Before 283s,the first expansion was carried out,including hydrogen storage tank group and 1-Lpg storage tank;after 283s.the second expansion occurred,causing the failure of gasoline storage tank and reaction tower.Genie software was used to draw the domino accident propagation process.In order to reduce the risk of domino,the gasoline storage tank was buried,the risk index value of domino dropped from 17.16 to 16.28,down 5.13%.The partition on the ground effectively eliminated the impact of explosive debris,thus reducing the risk.The risk reduction was due to the effective elimination of the impact of explosive debris by the diaphragm on the ground.In terms of park layout,the concept of "congestion degree" was put forward with three factors as the core:the distance between units in the plant area.the amount of medium in the unit and the risk of medium in the unit.A random fuzzy model was established by using fuzzy mathematics to quantify the characterization index of "congestion degree".The personal risk value was chosen as the index of domino risk,and the quantitative risk analysis was carried out for five tanks in aniline plant.According to the results,the change chart of personal risk value with the degree of layout congestion was drawn,and four levels of risk areas were divided.At the same time,the risk recommended safe zone(0?0.41/L-M+0.38/L),less safe zone(0.41/L-M+0.38/L?0.82/L-M),nsafe zone(0.83/L-M?0.78/M)and dangerous zone(0.78/M?1.00/H)were given.