The researchers studied how the temperature and humidity of flue gas from a desulfurization scrubber are affected by different operating conditions. They found that higher scrubbing liquid temperature leads to higher humidity and gas temperature. Increasing the liquid-to-gas ratio raises humidity but lowers gas temperature. A model showed that adding steam to the flue gas can create a supersaturated vapor environment, which helps remove fine particles. By optimizing the desulfurization system parameters and adding steam, this environment can be formed to improve particle removal efficiency.