Research On Flow Characteristics Of Syngas Crossing Liquid Pool In Texaco Gasification Quench Chamber

Coal gasification technology is a clean,efficient,and low-polluting coal utilization technology.Among them,Texaco coal slurry gasification technology is widely used because of its advantages of strong raw material adaptability and high system efficiency.The quench chamber is an important component of Texaco's gasification technology,the numerical simulation of the gas-liquid two-phase flow process and the multiphase flow separation process of gas,liquid and solid were carried out.The specific research content is as follows:The VOF model was used to simulate the formation process of gas bubbles in the gas-passing liquid pool and compared with the related experimental results.It was found that the simulation results were in good agreement with the experimental results,indicating that the model was used to simulate the gas-liquid two-phase flow studied.The process is feasible.A 3D physical model of the quench chamber was established,and the VOF model was used to study the flow characteristics of the gas-liquid two-phase chamber;Verify the established model by comparing with the relevant experimental results;The influence of the main factors such as gas velocity,liquid film velocity,initial water level height,two-tube gaps,and liquid film conditions on key issues such as flow characteristics,syngas water,and outlet pressure fluctuations were investigated.The study found that the increase of the syngas velocity and the initial height of the water level increased the amount of water carried,and as the distance between the two tubes increased,the amount of water carried was decreased;the liquid film velocity from the quench ring also had a significant effect on the flow behavior and the carrying water;Different influencing factors have a certain influence on the residence time of the synthesis gas through the quench chamber and the pressure at the exit section of the quench chamber.The VOF model was used to calculate the continuous gas-liquid phase.The DPM model was used to simulate the discrete phase.The separation characteristics of the gas,liquid and solid phases were simulated.The separation characteristics of the ash particles during their passage through the liquid pool were analyzed.The study found that ash particles can be separated during the synthesis gas through the liquid pool.The results obtained are in good agreement with the relevant experimental results.The impact depth of the ash particles in the quench chamber gradually increases over time,and the ash particles diffuse outward and upward along the descending tube.In this paper,the details of gas-liquid two-phase and gas-liquid-solid multiphase flow in the process of syngas cooling are obtained,and the law of the two-phase flow characteristics affected by the main factors and the separation characteristics of ash particles in multiphase flow are revealed,which can be actually synthesized.The gas scrubbing and cooling process provides a reference.