| Limestone-gypsum wet FGD technology is one of the most widely used SO2 removal technologies currently. With the improvement of emission standards for SO2 in flue gas, requirements of SO2 processing capacity in wet flue gas desulfurization system are also increasing, which lead to a higher requirements of oxidation ability in FGD slurry. Currently majority of oxidation part in desulfurization system has been unable to meet the new requirements, which need transformation optimize both in arrangement and operating parameters.In the wet flue gas desulfurization systems, state of motion and interaction mechanism of slurry, solids and bubble is the main factor in determining the oxidation efficiency and cost. Slurries and solid particles, bubble motion and interaction capability in slurry pond is determined by both flow conditions and reaction process.In this paper, transformation of wet flue gas desulfurization system in a 300 MW unit was chosen for research. With simulation under different arrangement, mounting height and rotation speeds, an optimal solutions for agitator arrangement was provided.The simulation results showed that: three agitator arrangement has better cyclone characteristics, and the effect is increased, while energy consumption also increasing with four stirrer arrangement; a better performance in solids suspending and slurry disturbance was found with mounting height h=1/3H; when rotational speed N = 400 rpm, a better swirl effect and solids suspension effect was found with improvement of economy.Through the experiment on the transformation objects, the effect of slurry pH, liquid and slurry density on reconstruction program was studied, in order to determine the best conditions of the optimization program, so as to optimize the reaction process of slurry pond. Experiment show that, for best results, the slurry pH is maintained at about 5.4 to 6.0, with slurry density in the range of 1130 to 1140 kg / m3, and the most appropriate level of 12.8m. |
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