What is the difference between dry desulfurization and wet desulfurization? thank you

The characteristics of wet desulfurization are that the desulfurization system is located at the end of flue, behind the dust collector, the reaction temperature is lower than the dew point during desulfurization, and the desulfurized flue gas needs to be reheated before being discharged. Because it is a gas-liquid reaction, its desulfurization reaction is fast and efficient, and the utilization rate of desulfurization additives is high. If lime is used as desulfurizer, when Ca/S= 1, the desulfurization rate can reach 90%, which is suitable for flue gas desulfurization in large coal-fired power plants. However, there are wastewater treatment problems in wet flue gas desulfurization, with large initial investment and high operating cost.

Definition of dry flue gas desulfurization: CaCO3 injected into the furnace is decomposed into CaO by high temperature calcination, which reacts with SO2 in flue gas to generate calcium sulfate; SO2 is converted into ammonium sulfate or sulfuric acid by electron beam irradiation or activated carbon adsorption, which is collectively called dry flue gas desulfurization technology.

merits and demerits

Its advantages are simple process flow, no sewage and acid treatment problems, low energy consumption, especially the high temperature of purified flue gas, which is beneficial to the diffusion of chimney exhaust gas, and will not produce the phenomenon of "white smoke". The purified flue gas does not need secondary heating and has low corrosiveness. Its disadvantages are low desulfurization efficiency, huge equipment, large investment, large area and high technical requirements for operation.