Abstract
On basis of investigation of the mass transfer coefficient and gas-liquid interfacial area, a mathematical model was developed to simulate the absorption of SO2 by ammonia in a spray scrubber. This model could provide predictions of the desulfurization efficiency at different operating conditions such as pH of solution, velocity of flue gas, liquid-to-gas ratio, SO2 concentration and the height of absorption zone. The calculated desulfurization efficiency of a lab-scale ammonia-based desulfurization system by this model was compared with that of corresponding measured data. The comparison results show that the relative error between the calculated desulfurization efficiency and the measured data is almost within ±32.5%. This fact could be explained as that the velocity of flue gas was not rigorously consistent in the radial direction and the droplets did not descend rigorously along the vertical line, because the diameter of the experimental spray scrubber is small in this study. The relative error between the calculated desulfurization efficiency and the measured values of plant-scale ammonia-based desulfurization system by this model would be smaller than that of lab-scale system. Accordingly, this model would be beneficial for optimizing design and operation of ammonia-based desulfurization system.
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