Process Plant Layout Optimization Considering Domino Effect and Economy

The layout design of process plant has a significant impact on the economy and safety of factories. In most previous work, security issues were transformed into economic numbers and incorporated into the economic objective function to obtain the lowest economic layout scheme. This conversion is inappropriate as it may result in the generated layout plan not meeting the actual safety needs, and economic figures cannot clearly represent the safety level of the factory. In this work, a multi-objective optimization method for chemical plant layout was proposed, with economy and safety as independent objectives to attempt to achieve different trade-offs between the two. The economic objective function is to minimize the capital costs related to layout, including piping costs, land costs, protective device costs, and expected property losses from accidents; The safety objective function is to minimize domino risk, and the domino risk under different layouts is measured by the domino hazard index (DHI). The proposed model is solved using the non-dominated sorting genetic algorithm II (NSGA-II).