Abstract
SO3 and sulfuric acid mist generated in coal-fired boilers and wet flue gas desulfurization (WFGD) processes can adversely affect boiler facilities, while detection and absorption is an important issue. Factors affecting the conversion of SO3 to sulfuric acid mist (SO3/sulfuric acid mist) during wet desulfurization were studied and evaluated in a simulated experimental system, including the effects of flue gas composition, temperature and humidity on the SO3/sulfuric acid mist conversion rate. The certain concentrations of SO3, water vapor, SO2, NO, NH3, O2 and N2 were mixed thoroughly to simulate the flue gas of WFGD under the special temperature conditions in this experiment. The sulfuric acid droplets, sulfuric acid vapor and sulfuric acid aerosol in the simulated flue gas were absorbed and intercepted by NaCl and quartz wool, gaseous SO3 was absorbed by isopropanol solution, and thorium-barium titration method was used to measure SO42− concentration. The results showed that the increase of temperature significantly decreased the SO3/sulfuric acid mist conversion rate, the increase of humidity significantly increased the SO3/sulfuric acid mist conversion rate, and O2 concentration had little effect on the SO3/sulfuric acid mist conversion rate. In addition, the increase concentration of NH3, NO and SO2 also improved the conversion rate of SO3/sulfuric acid mist to some extent.
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