气化炉内气体穿越液池过程压力波动特性

Simulation of Pressure Fluctuation and Flow Characteristics for Syngas Passing through Cistern in Gasifier

采用欧拉模型对室内合成气穿越液池的非定常流动过程进行了数值模拟。在分析气液两相流动特性的基础上，获得压力波动信号，通过快速傅里叶变换，分析了气流速度及静态液位对室内压力波动特性的影响，并将计算结果与文献实验值进行了对比，数值模拟结果与实验值一致。研究表明，洗涤冷却室内压力波动呈周期性变化。随着气流速度及静态液位高度的增加，压力波动幅度增大，主频能量提高，频率改变不明显，主要集中在3～4Hz。气流速度对压力波动的影响较静态液位显著。

A dynamic simulation was carried out for flow of syngas passing through a cistern based on Euler model. The pressure fluctuation signals were predicted by analyzing flow characteristics of the process. And using FFT method, the influences of airflow velocity and static liquid level on pressure fluctuating characteristics were analyzed. The calculated results were compared with experiments in the literature, and the calculated results were in good agreement with experimental values. The results showed that pressure difference fluctuation assumed periodic change. With the increase of gas velocity and static liquid level, the fluctuating range of pressure difference enhanced, power spectrum and amount of energy increased. Pressure fluctuation frequency concentrated at the frequency range between 3 and 4 Hz, and the power spectrum reached its maximum. And the influence of airflow velocity on pressure fluctuation was more prominent than static liquid level. It was also found that this main frequency almost kept stability in different operating conditions.