The explosion load is a significant escalation factor possibly influencing the potential occurrence of domino accidents in chemical plants. It is not economical to install explosion isolation systems (e.g., extinguishing barrier) for all equipment or process units across a chemical plant. Although shutting down all equipment or process unit can prevent an explosion, it may also cause further economic losses. To prevent domino accidents, the process unit that needs to be shut down accurately should be selected, and the normal operation of other units needs to be ensured. A method to select the process unit to be isolated based on the Dimensioning Accidental Load (DAL) is proposed. By calculating the occurrence probability and consequences of the accident scenarios, the DAL of the surrounding units is determined. DAL is used as the impact intensity of the accident unit on the surrounding units. The probit model is used to calculate the damage probability of surrounding units. The case analysis results show that the method of selecting the process unit to be isolated based on DAL quantifies the impact intensity of the exploded unit on surrounding units from probability and consequence. Under the premise of meeting the acceptable risk criteria, the method can determine which units should be shut down and which units can operate normally when a release accident occurs. While preventing domino accidents, economic losses caused by the shutdown of all process units are reduced and a theoretical basis for accident prevention and safe operation of the plant is provided.

爆炸负荷是一个重要的升级因素，可能会影响化工厂发生多米诺骨牌事故的可能性。为化工厂内的所有设备或过程单元安装爆炸隔离系统（例如，灭火屏障）是不经济的。尽管关闭所有设备或处理单元可以防止爆炸，但也可能造成进一步的经济损失。为防止发生多米诺骨牌事故，应选择需要准确关闭的处理单元，并确保其他单元的正常运行。提出了一种基于尺寸意外载荷（DAL）选择待隔离工艺单元的方法。通过计算事故场景的发生概率和后果，确定周围单元的DAL。DAL用作事故单元对周围单元的冲击强度。概率模型用于计算周围单元的损坏概率。案例分析结果表明，基于DAL的分离处理单元的选择方法可以根据概率和后果量化爆炸单元对周围单元的冲击强度。在满足可接受的风险标准的前提下，该方法可以确定发生释放事故时应关闭哪些设备以及哪些设备可以正常运行。在防止多米诺骨牌事故的同时，减少了因关闭所有处理单元而造成的经济损失，并为事故预防和工厂的安全运行提供了理论基础。概率模型用于计算周围单元的损坏概率。案例分析结果表明，基于DAL的分离处理单元的选择方法可以根据概率和后果量化爆炸单元对周围单元的冲击强度。在满足可接受的风险标准的前提下，该方法可以确定发生释放事故时应关闭哪些设备以及哪些设备可以正常运行。在防止多米诺骨牌事故的同时，减少了因关闭所有处理单元而造成的经济损失，并为事故预防和工厂的安全运行提供了理论基础。概率模型用于计算周围单元的损坏概率。案例分析结果表明，基于DAL的待分离处理单元选择方法从概率和后果上量化了爆炸单元对周围单元的冲击强度。在满足可接受的风险标准的前提下，该方法可以确定发生释放事故时应关闭哪些设备以及哪些设备可以正常运行。在防止多米诺骨牌事故的同时，减少了因关闭所有处理单元而造成的经济损失，并为事故预防和工厂的安全运行提供了理论基础。案例分析结果表明，基于DAL的待分离处理单元选择方法从概率和后果上量化了爆炸单元对周围单元的冲击强度。在满足可接受的风险标准的前提下，该方法可以确定发生释放事故时应关闭哪些设备以及哪些设备可以正常运行。在防止多米诺骨牌事故的同时，减少了由于关闭所有处理单元而造成的经济损失，并为事故预防和工厂的安全运行提供了理论基础。案例分析结果表明，基于DAL的待分离处理单元选择方法从概率和后果上量化了爆炸单元对周围单元的冲击强度。在满足可接受的风险标准的前提下，该方法可以确定发生释放事故时应关闭哪些设备以及哪些设备可以正常运行。在防止多米诺骨牌事故的同时，减少了因关闭所有处理单元而造成的经济损失，并为事故预防和工厂的安全运行提供了理论基础。