Modelagem da dispersão atmosférica de gases densos decorrente de liberações acidentais no transporte rodoviário com produtos perigosos

Abstract

This work aimed to analyze the atmospheric dispersion of dense gases, such as ammonia (NH3) and chlorine (Cl2), resulting from hypothetical leaks in the tank of a truck during road transportation. By using mathematical models, it was possible to estimate, considering an accidental release, the distance to which the cloud formed in the atmosphere would travel from the leakage point until it is sufficiently diluted to no longer pose a danger in terms of toxicity. To perform this analysis, the ALOHA software and Google Earth were used. Among the scenarios analyzed, the results showed that in Scenario 1 (Scenario 1: Manual ALOHA – Chlorine), the toxic cloud reached a length of 1,37 km in the red zone, which is the lethal zone, and the objective was to validate the method used in the other scenarios. In Scenario 2 (Scenario 2: BR-392 Accident – Chlorine), the cloud with the greatest reach among continuous releases was in case 2, with the leak hole height at 0 m, having a length of 5 km in the red zone, and among instant releases, it was in case 3, with the leak hole height at 0 m, with a length of 4,7 km in the red zone. Finally, in Scenario 3 (Scenario 3: Santa Bárbara WTP – Ammonia), the plume that had the greatest reach during the nighttime was in case 6, with a distance of 484 m in the red zone, and during the daytime, the greatest reach was in case 4, with a length of 139 m in the red zone.