Comprehensive comparison of commonly used wet desulfurization process(2)
Crushing equipments and grinding equipments
desulfurization process, Wet desulfurization process,
4.Magnesium Oxide law
Magnesium Oxide method using Magnesium Oxide and SO2 reaction to get sub Magnesium Sulfate and Magnesium Sulfate, they can be re decomposed by calcination Magnesium Oxide, while the recovery of more pure SO2 gas, desulfurization agent can be recycled. Because of the high activity of Magnesium Oxide, the desulfurization efficiency is higher than that of the lime method. Its disadvantage is that the process of recycling Magnesium Oxide need to be calcined, the process is more complex, but if the direct use of discarded, magnesium salt will lead to two pollution, the overall operating costs are higher.
Ammonia method using ammonia as a SO2 absorbent, SO2 and NH3 reaction can produce ammonium sulfite, ammonium sulfite and part of the production of ammonium sulfate. According to the different regeneration methods of the absorption liquid, the ammonia method can be divided into ammonia acid method, ammonia - ammonium sulfite
Method and ammonia - ammonium sulfate method. Ammonia method is the main advantage of high desulfurization efficiency (similar to the sodium base method), the by-product can be used as agricultural fertilizer.
Due to ammonia volatilization, the absorbent consumption increased, the desulfurizer utilization rate is not high; the concentration of ammonia desulfurization have certain requirements, if the ammonia concentration is too low, not only affect the desulfurization efficiency, and the water circulation system is huge, operation cost increases: the increase of the concentration of, will inevitably lead to evaporation increases, the impact on the environment. Moreover, the SO2 reaction in the flue gas of ammonia is easy to be purified, and the aerosol is formed, so that the flue gas can not be discharged into the standard.
Ammonia recovery process is very difficult, high investment cost, equipped with acid making system or crystal recovery device, such as neutralizer, crystallization, dewatering machine, dryer, etc., complex systems, equipment and different, manage and maintenance requirements.
, Wet desulfurization process