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Investigation on the screening model of chemical hazards based on the risk of domino effect and terrorist attack 10

Investigation on the screening model of chemical hazards bas...

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2020 10th Chinese Geosynthetics Conference and International Symposium on Civil Engineering and Geosynthetics, ISCEG 2020

作者： Huang, Wenduo Shao, Xuechun Wang, Jiajie Xiao, Yang Sun, Dongliang State Environ. Protect. Key Lab. of Environmental Risk Assessment and Control on Chemical Process School of Resources and Environmental Engineering East China University of Science and Technology Shanghai200237 China

The heavy losses are often caused in modern chemical plants at the time of the accident. In order to prevent accidents, the screening and identification of hazards is needed. In this paper, the screening model of hazards in chemical plants was studied under the domino effect and the risk of terrorist attack. According to the threshold and strength of the domino effect of the unit under the main accident scenarios, the index of domino effect was developed. The risk index of terrorist attacks was determined in line with the distance between the unit and the boundary under the assumption of terrorist attacks. The hazards screening model Z was designed based on two aspects of the study. The model was applied in screening the hazards. The results showed that closer units near the border were more dangerous under the risk of terrorist attack, and the devices surrounded by units with greater influence of accidents were more dangerous under the risk of domino effect. The indices of the tanks were ordered: Z105>Z101>Z103>Z106>Z104>Z102>Z201>Z202>Z203>Z204>Z205>Z206>Z303>Z304>Z301>Z302>Z306>Z305. The domino effect and the risk of terrorist attacks were combined into the present model for perfection and correction of the existing hazards screening model, as the new basis for major hazards identification. © The Authors, published by EDP Sciences 2020.

关键词： chemical plants

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Influence mechanism of congestion degree of layout on domino effect in petrochemical plants 10

Influence mechanism of congestion degree of layout on domino...

引用

2020 10th Chinese Geosynthetics Conference and International Symposium on Civil Engineering and Geosynthetics, ISCEG 2020

The study focused on the establishment of the congestion degree in describing the layout of process plants, and discovering the influence mechanism of congestion degree on the risk of domino effect, in view of the fact that the congestion degree has not been used to represent the characteristics of petrochemical plant layout. A characterization model was built for the congestion degree of process plant layouts applying the theory of fuzzy model that it took safety distance, the amount of materials involved and the hazard of these substances into consideration, and came out with a membership function through logical calculus, which made congestion degree a comparable data. Secondly, a systematic domino effect risk analysis method was generalized on account of domino effect quantitative risk analysis method which include the equipment damage probability, the domino effect occurrence probability, risk analysis based on the consequences, individual risk index and social risk index, the process plant natural risk index and real risk index, and then these indices were compared to select the most suitable ones to illustrate the risk of domino effect and to research about part of the storage tank field of a petrochemical plant. Finally, the influence mechanism of layout congestion degree on domino effect of regional accident was obtained through this quantitative analysis. Simultaneously, a range of the congestion degree was acquired according to the individual risk index which can be used as a reference in the design stage of the process plant. The result proved that high congestion degree in process plant greatly increased the risk of domino effect in most of the quantitative risk analysis index, such as the probability of resulting in secondary accidents, the harm on both human and the equipments caused by the initial accident, and the individual risk and social risk, etc. The characterization models for the congestion degree and the domino risk analysis method establish

关键词： Petrochemical plants

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Numerical Simulation of Flow and Heat Transfer Characteristics in Biomass Feeder 5

Numerical Simulation of Flow and Heat Transfer Characteristi...

引用

2018 5th International Conference on Advanced Composite Materials and Manufacturing Engineering, ACMME 2018

作者： Wang, Zhenhua Chang, Yulong Liu, Zheming Wang, Hualin State Environ. Protect. Key Lab. of Environmental Risk Assessment and Control on Chemical Process School of Mechanical and Power Engineering East China University of Science and Technology Shanghai200237 China

In this paper, designed a swirling feeder for biomass tar, The numerical simulation of flow characteristics and temperature field heat transfer characteristics of the internal flow field was performed. Mixture multiphase flow model and Reynolds stress turbulence model are used, in the case of different feed flow ratios, Solved the internal flow field, concentration field and temperature field;Through research shows that when the flow ratio i = 0.6 ∼ 0.8, Biomass tar can enter the reactor through the feeder without causing coking. © Published under licence by IOP Publishing Ltd.

关键词： Flow fields

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