Experimental Study on Removal of SO3 from Flue Gas by Na2CO3

Abstract The alkaline absorbent spraying technology is an efficient method for accurately removing SO3 in flue gas. By studying the characteristics of the technology, the reaction mechanism, the migration rule of SO3, and the experimental platform by using the real flue gas as the source of the alkaline absorbent jet removal of flue gas SO3. The results of the study show that the efficiency of the alkaline absorbent to remove SO3 is related to n(Na2CO3):n(SO3), flue gas temperature, residence time and other factors; under the test conditions, the flue gas temperature is 320°C, n(Na2CO3): n(SO3) is 1:4, the concentration of Na2CO3 solution after gasification is 52.6 mg/m3, and the concentration of soot is 4680 mg/m3 under standard conditions, which can ensure the removal efficiency of SO3 is above 85%; The effect of the catalyst is small and can be ignored. The above results can provide a reference for the domestic coal-fired power plants to carry out the research and application of alkaline absorbent to remove flue gas SO3 technology.