静态旋流强化湿法烟气脱硫研究进展

静态旋流作为湿法烟气脱硫中一种强化传质的方式，对其发展现状与趋势展开研究。分析了旋流吸收器的内部气相速度场以及强化传质的过程原理，综合比较了各类气液接触的脱硫方式、脱硫剂的特征，确定了在运行范围内脱硫剂浓度、气液流速、SO₂浓度等操作参数对于脱硫效率η和气相总体积传质系数K_ga的影响及其机理，剖析了利用传质理论进行旋流吸收的研究及发展，介绍了旋流脱硫的工业应用。结果表明:静态旋流有助于脱硫传质过程的强化，在工况范围内，吸收液浓度、气液流速的增加，提高了η和K_ga，但随着SO₂浓度的增加，η及K_ga略有下降，分别最高下降7.1%和0.75 s-1，总工况范围内η和K_ga分别为68.58%~97.63%和5.08~8.46 s-1。研究结果可对基于旋流强化的工业烟气脱硫提供参考。

ADVANCES IN STATIC VORTEX FLOW ENHANCING MASS TRANSFER FOR WET FLUE GAS DESULFURIZATION

Static vortex was a way for progress intensification in wet flue gas desulfurization, and its status and trend were studied. The gas-phase flow field and the principle of the progress intensification were introduced. Various types of gas-liquid contact were compared, and the characteristics of various absorbents were analysed. The effects of the absorbent concentration, gas and liquid flow rate and SO₂ concentration on the desulfurization efficiency (η) and the overall gas phase mass transfer coefficient(K_ga) were determined and the mechanisms were explained. The research on cyclone absorber using mass transfer theory and development of mass transfer theory were analyzed, and the industrial applications were introduced. The results showed that static vortex flow was useful to improve desulfurization efficiency and mass transfer rate, and η and K_ga increased with the increase of absorbent concentration and gas-liquid flow rate; but with the increase of SO₂ concentration, η and K_ga decreased slightly(with maximum value of 7.1% and 0.75 s-1, namely), and the range of η and K_ga in all operation conditions were 68.58%~97.63% and 5.08~8.46 s-1, respectively. The results of the research could offer references for the industrial use of vortex flow technology for desulfurization.