Flue gas desulfurization and denitrification system

The utility model discloses a flue gas desulfurization and denitrification system and relates to the technical field of waste gas treatment. Comprising a negative pressure discharge mechanism, one end of the negative pressure discharge mechanism is fixedly connected with an absorption tank, the absorption tank comprises a tank body, the top of the tank body is fixedly connected with a tank top, the outer wall of the top of the tank top is fixedly connected with a liquid inlet pipe, the bottom of the tank body is fixedly connected with a tank bottom, and the bottom of the tank bottom is fixedly connected with a drainage pipe; the outer wall of the tank bottom is fixedly connected with a smoke inlet pipe, and the inner wall of the tank body is fixedly connected with a molecular sieve tank and a plurality of pieces of parallel gauze cloth in sequence from bottom to top. The spray head capable of atomizing the treating fluid is arranged at the top of the tank, so that the vaporized treating fluid is in contact wi