Effect of ring baffle configuration in a self-priming venturi scrubber using CFD simulations
Shuai Yang*, Xiangdi Zhao, Wanfu Sun, Jiwu Yuan, Zheng Wang
This study uses computational fluid dynamics to survey the gas‒liquid flow hydrodynamics of a self-priming venturi scrubber with and without ring baffles. Based on the simulation results, we explore how the structure and configuration parameters such as baffle height, opening-area ratio, and baffle thickness affect the injection flow rate and the homogeneity of the gas‒liquid mixture. In addition, we report the best structure and configuration parameters for the ring baffle. The best position for the ring baffle is at nearly 7/16 of the length of the diffuser above the throat. Having the baffle too near the throat causes large pressure loss, decreasing the injection flow rate. The decrease in opening-area ratio leads to a lower injection flow rate and a more homogeneous gas‒liquid mixture. The optimal value depends on the requirement of the injection flow rate. For the baffle thickness, 5 mm is recommended; an overly thick baffle decreases the homogeneity of the gas‒liquid mixture near the throat. All structure parameters and configuration parameters must satisfy the requirement imposed by the injection flow rate and scrubbing efficiency.
Self-priming mode; Venturi scrubber; Computational fluid dynamics; Injection flow rate; Mixing degree; Scrubbing efficiency