Abstract��The requirements of gas uniform distribution, gas-liquid mass transfer and blockage prevention are all needed to consider when designing a gas-liquid sparger for large slurry reactor. Based on this, a kind of gas-liquid co-injection sparger with large nozzle diameter was proposed. Firstly, the average gas holdup and phase holdup of large and small bubble were measured through cold-test experiment while the sparger was single nozzle, which proved that gas-liquid co-injection could significantly enhance gas-liquid mass transfer and reduce bubble diameter. Subsequently, we carried out 3D transient simulation of the flow inside the designed large multi-ring gas-liquid sparger whose outer diameter was 6.3 meter to explore the methods to improve the gas uniform distribution. The results showed that the maldistribution could be significantly addressed by replacing usual constant diameter distributor tube with variable diameter distributor tube whose diameter increases with ring diameter. Finally, the performance of the gas-liquid sparger under different loads was simulated, the results showed that the gas distribution performance of the sparger was stable with ?40% load fluctuation and the sparger could meet the requirements of industrial application.
