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Since the accounting results of VOCs emissions from crude oil storage tanks in petrochemical enterprises in China are different and the evaluation method is not suitable for specific storage tanks, a method based on the mass flux model was established to reflect the VOCs emissions from crude oil storage tanks in real-time through field measured data. Taking a crude oil storage tank in an oil depot in northern China as the research object, the environmental concentration of atmospheric VOCs was monitored for several months before and after the renovation of the crude oil storage tank, and the scale-up trace gas release experiment was carried out simultaneously, and the applicability and accuracy of the accounting method in this oil depot were analyzed. The results showed that: (1) Under the conditions of wind speed greater than 1.5 m·s-1 but less than 3.5 m·s-1 and wind direction angle less than 22.5 o, the error between the calculated average emission and the actual emission was about 8%; (2) Using the accounting method based on the mass flux model to calculate the VOCs emissions of crude oil storage tanks, the annual VOCs emission was about 90.9 t before the crude oil storage tank was reconstructed, and it was about 28.2 t~29.52 t after the reconstruction, and the emission reduction ratio was 67.52%~68.98%; (3) Using the formula method in the Guideline to calculating the VOCs emission status of crude oil storage tanks before and after renovation, the calculated value of the mass flux model accounting method was about 1.22~3.82 times that of the formula method in the Guideline. The analysis was mainly caused by two factors: the instantaneous emission of storage tanks was not considered in the formula method in the guide, the relevant parameters were not localized, and the influence of meteorological factors was not fully considered in the monitoring of the mass flux model accounting method.
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