Investigating the environmental effects of nitrogen tetroxide and modeling the emission radius with ALOHA and Wiser software.

Considering the necessity of the country's space development and moving towards the launch of satellites, the use of high-power propellants such as nitrogen tetraoxide N₂O₄ is essential. Also, in the 7 the development plan, the necessity of environmental assessment is taken into consideration and it is stated that all big plans and projects must have an environmental assessment. In this research, it has been tried to investigate by modeling the emission before and after using the scrubber as one of the solutions to reduce the radius of emission and the amount of N₂O₄ emission. Therefore, according to the purpose of the research, firstly, the diffusion radius related to the opening of the vent valve from a 12-ton N₂O₄ tank was investigated with ALOHA and Wiser software, and its diffusion radius was modeled. Then, the modeling was done with a scrubber on the road and the simulation was done again in ALOHA software. The result was that with the use of the scrubber, the emission radius of the leak was reduced up to 16 times, and it should only be far away from the human habitat up to a radius of 1.5 km. . Of course, the presence of this substance in low doses has a positive effect on the growth and development of some plants, and due to the low half-life of this substance and its absorption in the environment and its removal by solar photolysis, its effect on humans was only investigated. The result is that if a scrubber is used, the material emission radius is reduced to 1/16, and after 600 meters, there will be clean air in accordance with long-term human biorequirements.