气化合成气洗涤塔中气液两相流动的数值模拟

Numerical simulation of gas liquid two phase flow in syngas scrubber of gasification

针对合成气洗涤塔中合成气带水和灰渣堵塞的问题,应用双流体模型,研究了GSP气化装置洗涤塔中内构件结构对于气液两相流体力学的影响。数值模拟结果展示了不同工况下压降、气含率等流体力学参数的分布规律,同时还得到了详细的流场分布。研究结果表明,升气筒的存在会导致严重的雾沫夹带情况;设置挡板对于减缓气泡穿刺有一定作用。为了验证数值模拟的可靠性,开展了冷模试验研究,试验结果直观地展示了升气筒导致雾沫夹带的过程,同时展示了挡板对于气泡流动的影响。试验结果和模拟结果较为一致,验证了数值模拟对于洗涤塔设计优化的指导作用。

According to the syngas with water and ash jammed problem occurred in the syngas scrubber,the two fluid model was applied to study the internal framework structure in the scrubber of the GSP gasification device affected to the gas liquid two phase fluid mechanics.The numerical simulation results showed the distribution law of the pressure drop,gas content rate and fluid mechanics parameters under the different performances. The detail flow field distribution was obtained. The study results showed that the gas rising cylinder existed could cause serious entrainment and the baffle could play a certain role to release bubbles punctured. In order to verify the reliability of the numerical simulation,a cold model experiment was conducted. The experiment results visually showed the entrainment process caused by the gas rising cylinder and showed the influences of the baffle to the bubble flow. The experiment results were a quite same to the simulation results and the numerical simulation verified had a guide role to the optimization of the scrubber design.