The utility model relates to a
flue gas desulfurization and
denitrification purification
system which comprises a desulfurization
tower, a
denitrification tower and a
desorption tower, and the desulfurization tower and the
denitrification tower are sequentially communicated along a
flue gas flowing direction, so that
flue gas sequentially passes through the desulfurization tower and the denitrification tower; a
discharge port of the
desorption tower is connected with a feed port of the desulfurization tower and a feed port of the denitration tower through a first conveying mechanism and used for conveying active
coke to the desulfurization tower and the denitration tower, and a
discharge port of the denitration tower is connected with the feed port of the desulfurization tower through a second conveying mechanism. And a
discharge port of the desulfurization tower is connected with a feed port of the
desorption tower through a third conveying mechanism. According to the utility model, the denitrated active
coke is conveyed to the desulfurization tower, so that the
utilization rate of the active
coke is improved, the idling of the denitrated active coke is avoided, and the denitrated active coke is conveyed to the desulfurization tower instead of being mixed with the active coke at the outlet of the desulfurization tower and then enters the desorption tower, so that the total circulation volume of the active coke is reduced, and the abrasion consumption of the active coke is reduced.