Simulation study on flow characteristics of gas-liquid in scrubbing-cooling chamber of coal-water-slurry entrained-flow gasifier

An Euler-Euler two-fluid model was used to study the gas-liquid flow process of gas passing through a pool in scrubbing-cooling chamber of coal-water-slurry entrained-flow gasifier. A two-phase version of the RNG κ-ε turbulence model was used for the liquid and gas respectively. Comparisons of computational results with experimental data are also made. It is found that the present model has a better performance for predicting the gas-liquid flow characteristics in the scrubbing-cooling chamber. The results show that the gas gathers along the outer wall of cooling pipe and rises with the maximum velocity. The turbulent kinetic energy of gas and liquid mainly exist near the exit and outer wall of cooling pipe. The separator insert in the scrubbing-cooling chamber promotes the gas diffusion, affects the gas-liquid distribution, and leads to a wide distribution of the gas in pool. The separator inserter is able to restrain the fluctuation of the liquid surface and enhance the operation stability of the equipments.