A wet
ammonium flue gas cleaning process for desulfurizing and denitrifying and a
system thereof are disclosed. The process oxidates NO in the
flue gas to be NO2, makes SO2 and NO2 in the
flue gas react with
ammonium to product
ammonium sulfite,
ammonium nitrate and
ammonium nitrite, then oxidates
ammonium sulfite and
ammonium nitrite therein to product the byproduct that is ammiaonia
sulfate and
ammonium nitrate, and lastly gets the clear
flue gas after demisting to the desulfurizing and denitrifying
flue gas. The
system comprises a dust pre-collector, a
hydrogen peroxide or
ozone sprayer, and a desulfurizing and denitrifying
tower, which are connected in turns, wherein
ammonia replenishment
system and an air feeding device are mounted at the bottom of the desulfurizing and denitrifying
tower, sprinkling layer which can cycle sprinkle is mounted at the middle, and a
demister is mounted at the upper. The invention has a simple process, a simplified system, a low investment and operation cost. The invention not only has a high efficiency in desulfurizing and denitrifying, but also a high utilance of desulfurizing and denitrifying absorbent, and byproduct of desulfurization and denitration can be utilized as chemical
fertilizer of ammiaonia
sulfate and
ammonium nitrate.