Simulation of the chemical damage zone in the conditions of emergency localization

Maksym Kustov

National University of Civil Protection of Ukraine

https://orcid.org/0000-0002-6960-6399

Oleksii Basmanov

National University of Civil Protection of Ukraine

https://orcid.org/0000-0002-6434-6575

Andrey Melnichenko

National University of Civil Protection of Ukraine

https://orcid.org/0000-0002-7229-6926

DOI: https://doi.org/10.5281/zenodo.4400185

Keywords: emissions, hazardous chemicals, contamination area, hazardous substance deposition, spray intensity

Abstract

A mathematical model of the distribution of gaseous hazardous chemicals has been developed, taking into account the factors of their active deposition on the distribution path. The conditions of dis-tribution of gaseous hazardous substance during depressurization of technological equipment during the localization of the accident by deposition of hazardous chemical substance by sprayed jets are analyzed. To simplify the modeling, a number of assumptions have been made regarding wind parameters, emis-sion and deposition conditions, which simplify the forecasting process and are within the permissible error limits. Based on Gaussian law and taking into account the parameters of the source of emission of hazardous chemical substance and its deposition, the differential equation of distribution of hazardous chemical substance under the conditions of emergency localization is obtained. By solving the differen-tial equation of diffusion, a mathematical model of the distribution of gaseous hazardous substances in the emergency zone is obtained, taking into account its active deposition by operational and rescue units. In modeling, the process of precipitation of hazardous chemicals by fine liquid flow was consid-ered as the process of gas sorption by spherical flow droplets, taking into account both the physico-chemical interaction of gas and liquid and the intensity of fine flow. The developed mathematical model allows to calculate the size of chemical pollution zones with determination of boundary safety condi-tions taking into account wind direction and speed, air temperature, degree of vertical stability of air, width of active deposition zone and chemical properties of both gas and liquid. Taking into account the process of localization of the accident zone when forecasting the development of an emergency situation allows the emergency response manager to make the right management decision, ensure safe working conditions for rescuers and optimize evacuation work from the affected area and property.

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