Study On The Transmission Of High-viscosity Oil Near Export Of Tank

In the case of low temperature, highly viscous crude oil of oil tank was used to flow slowly, that seriously affected the transmission speed. Highly viscous crude oil is heated or imposed other mechanical force that can promote the flow speed of highly viscous crude oil. For these reasons, the paper first analyzed the heating viscosity reduction technology,then started with the theory of computational fluid dynamics and used computational fluid dynamics software FLUENT to build the geometry model, mesh grid, set the boundary conditions, choose turbulent model and rotating model, set parameters of solution for the screw delivery devices, small helicoid, heater and nearby highly viscous crude oil area, and study on the simulation and experimental research about heating and flowing behavior of highly viscous crude oil within the tank.Results of flowing behavior of highly viscous crude oil show that under the action of the screw delivery devices, maximum flow velocity is mainly concentrated in of the radial within R/2 area, but with the role of small helicoid rotating in pipeline, maximum flow velocity is mainly concentrated in the radial outside R/4 area. When the screw delivery devices in the tank, it is in open-type fluid environment, the effect of promoting and suction for highly viscous crude oil are limited. During the speed increase from 60r/min to 300r/min process, the increase of gradient of velocity is much less than that of gradient of speed. While the small helicoid(blade diameter 100 mm)rotating in the pipeline(nominal diameter 100 mm), as a pipe on the outside, it plays a binding role for the flow of crude oil. As the speed increases, the suction effect for highly viscous crude oil is continuously strengthened. When the speed reaches 300r/min, the entrance area of crude oil pipelines appeared a 1.20×103 Pa negative pressure zone. It has a strong suction effect for highly viscous crude oil to accelerate the flow of highly viscous crude oil. Results of the temperature field of highly viscous crude oil show that crude oil flows upward along the heater and flows down along the tank wall to form a flow loop. The temperature and pressure of crude oil in the upper region is significantly higher than those in the lower regions, indicating that the heater on the lower region of heating oil viscosity is not sufficient. Simulation of computational fluid dynamics can not be separated from experiments. Finally, we conducted some related experiments to the flow behavior of highly viscous crude oil and temperature field in the confirmatory experiment.