To address the issues of low production efficiency and poor product quality caused by the uneven flow field within a C5 petroleum resin reactor, the computational fluid dynamics (CFD) method was employed, combined with the standard k-ε turbulence model, to conduct a numerical simulation of the flow field within the reactor. The results show that the velocities at the inlet and outlet of the reactor are relatively high, while the distribution within the chamber exhibits high velocity at the center and low velocity at the walls. To improve the uniformity of the flow field, three improvement schemes were proposed: optimizing the opening structure of the diffuser, reducing the diameter of the distributor holes, and adding guide cones. The results show that when the number of the diffuser opening is changed to 4 and 6, the standard deviation of the velocity at the cross-section at a height of 17 m in the reactor is reduced by 51.1% and 84.6%, respectively, compared to the original model. When the orifice diameter of the distributor is reduced from 19 mm to 13 mm, the standard deviation of the cross-sectional velocity at a height of 21 m decreases by 32.2%, and the vortices in the middle section of the chamber are reduced. Adding a single group of guide cones effectively disperses the central high-speed area, reducing the velocity standard deviation at a height of 21 m from 0.001 45 m/s in the original model to 0.000 559 m/s, a reduction of 61.3%. Moreover, it reduces the vortices in the streamline and improves velocity uniformity and flow stability. These results provide a scientific basis for the structural optimization of a C5 petroleum resin reactor and may enable improved production efficiency and product quality.
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