Numerical Simulation Of Atomization Process Of Tower Cooling In The De- Layed Coking Based On Fluid-structure Interaction

A two-dimensional axisymmetric fluid solid coupled model is developed and applied by ANSYS-WORKBENCH to simulate both the traditional pure steam and atomization cooling method in the big flow stage of delayed coking.Firstly, the temperature distribution in coke drum using vapor cooling method was ob-tained and verified on-site. The transient temperature field of coke drum using atomization method was predicted. The impacts of the water content on the effects of coke drum cooling was illustrated and analyzed. The economic efficiency of the atomization cooling was quanti-tative evaluated. Another, the structural stress analysis of coke drum applied in atomization cooling was carried by establishing a 3D model to get the variation of stress with the parame-ters of the atomization cooling process. Finally, the stress assessment was checked and evalu-ated of coke drum cooling by atomization based on the pressure vessel analysis design stand-ard of JB4732.A comprehensive consideration about cooling effect and safety of the coke tower was taken to give the optimal water fraction. The research results indicates that the cooling effect is first quickly improved then slowed down and final restrained with the in-crease of content of liquid water, the optimum water fraction is 0.8 to realize the best cooling effect. The vapor saving is 36%-84% for the liquid water fraction from 0.4 to 0.9 at the condi-tion of 0.4 MPa and 7.5 t/h mass rate of atomization. The stress level of the drum increases with the increase of the liquid water content, and the ultimate optimal liquid water content is 0.7. Saving 31.4% of the cost compared with traditional method.