Numerical simulation of VOCs diffusion from multiple emission sources at a large combined station in an oilfield

Abstract

Oil field joint station is an important part of oil field, there is the possibility of oil and gas (VOCs) emission, it is necessary to carry out research on the oil vapor emission laws of oilfields. Therefore, taking a typical united station as an example, a 1:1 practical model was established. Combined with on-site investigation, testing and numerical simulation, an investigation of the oil vapor diffusion mechanism under normal conditions and the superposition effect of oil vapor leakage and diffusion at the crack of the storage tank was conducted emphatically. The results showed that: under the influence of wind speed, the oil vapor could easily reach the explosion limit due to the circumfluence and backflow between the tanks and the leeward side; under the action of gravity and eddy current, oil vapor would accumulate on the leeward side, but the superposition effect was not obvious; When the tank wall was damaged and leaked, a positive pressure area would appear behind the accident tank. Under the influence of eddy current and strong airflow, the superimposed oil vapor concentration would be significantly enhanced, and will spread to the downwind in a point-like manner, accelerating the extension of oil vapor explosion danger area. The results of this study can provide reference for the design, operation management and safety and environmental protection measures of the joint station.