Numerical simulation and optimization of the dual circulation flow cleaning device for underground crude oil storage caverns

摘要

The underground oil storage cavern has the advantages of safety, large storage capacity and economical. It is widely used in the national strategic petroleum reserve and various commercial storage. In order to solve the problem of crude oil sludge deposition, this paper based on the principle of jet and the dual circulation flow cleaning method, using numerical simulation to verify the possibility of cleaning the cavern by the dual circulation flow, and the layout of the nozzle in the cavern is optimized and analyzed. The results show that in the 400m caverns, 25m spacing with a nozzle is the best layout spacing, but the circulation shape with different nozzle spacing is roughly same, even the 40m spacing between the nozzle can form a good dual circulation. The difference of nozzle spacing is mainly reflected in the average velocity of circulation. The overall velocity of the circulation increases with the increase of the nozzle spacing, but the rate of increase decreases with the increase of nozzle spacing.