Adopting sodium-based dry desulfurization is to use the ultrafine powder of desulfurizer to fully mix and contact the flue gas, and quickly react with the SO2 in the flue gas under the action of catalysts and accelerators. Moreover, in the reactor, flue and bag filter, the ultra-fine powder of desulfurization agent has always reacted with the SO2 in the flue gas. The reaction is fast and sufficient, and the by-product Na2SO4 can be produced within 2 seconds. By-products are recovered through cloth bags and used as chemical products. This kind of reaction has high desulfurization efficiency. When the chemical reaction equivalent is 1:1, the desulfurization efficiency is relatively high, and the desulfurization agent is sprayed in one time without circulation. The desulfurization mechanism uses sodium bicarbonate (NaHCO3) as the desulfurizer, which is activated under the action of high-temperature flue gas, and forms a microporous structure on the surface, just like popcorn is popped. The flue gas in the flue is fully in contact with the activated desulfurizer and a chemical reaction occurs. The SO2 and other acidic media in the medium are absorbed and purified, and the desulfurized and dried Na2SO4 by-products enter the bag filter along with the air flow and are captured.

Main reaction: 2NaHCO3(S) = Na2CO3(s)+H2O(g)+CO2(g) (1)

SO2(g)+Na2CO3(s) +1/2O2 = Na2SO4(s)+CO2(g) (2)

Side reaction: SO3(g)+Na2CO3(s) = Na2SO4(s)+CO2(g)