Estimation of evaporation losses of gasoline for different seasons of the year in Tehran gas stations

Volatile organic compounds such as gasoline vapors have adverse effects on the environment. In the metropolis of Tehran, gasoline is considered as a toxic and dangerous pollutant. One of the most important sources of gasoline vapor emissions in the environment is storage tanks for petroleum products, operational processes, and the number of emptying and loading of storage tanks and gasoline sales activities at gas stations.

To calculate the emission of gasoline vapors from storage tanks of petroleum products in gasoline supply channels, a variety of software, including EPA Tanks 4.09 / E&P Tanks / Tanks ESP / ERA Tanks Module, which in this study of software TANKS 4.09 have been used. The following data such as physical characteristics of the reservoir (dimensions) / number of loading times of reservoirs / spatial characteristics of reservoirs (climatic parameters) / specifications of petroleum products stored in the reservoir, etc. were entered into the software for 22 areas of Tehran.

According to the output and reporting of gasoline vapor emission software from 413 tanks installed in 148 gas stations located in 22 districts of Tehran, it is about 7702356 liters per year. About 56.78% of it is released in the warm 6 months of the year and about 43.21% in the cold 6 months of the year and in the spring, summer, autumn and winter seasons, about 27.06%, 29.56%, 22.63% and 20.73% are released into the environment. . Publications have been more in 6 months of the year, with most of emissions of gasoline vapors being from mid-May to mid-November. By comparing the percentage of vapor emission with the percentage of number of loading times, percentage of operating capacity and number of tanks and percentage of gas stations in Tehran, it can be concluded that effective factors in increasing gasoline vapor emission are high number of loading times and high maximum operating capacity and number Tanks and low number of gas stations. The highest emissions are related to regions 4, 2 and 15, respectively, which according to surveys and classification based on maximum gasoline sales and number of loading times and maximum operating capacity and number of tanks, these three regions have the highest statistics in these cases.

Considering the amount of gasoline sales about 4219217500 liters and the amount of waste and emissions of gasoline vapors to 7702356 liters per year, it can be concluded that the amount of gasoline products consumed in 1397 in Tehran was about 4226919856 liters.