A system for desulfurization and denitrification integrated treatment and recycling of flue gas by using red mud, comprising a desulfurization spray tower, an ozone generator, a denitration spray tower, a slurry mixing tank, a slurry storage tank, a vacuum filter, an ammonia water neutralization tank, an aluminum hydroxide precipitation tank, an ammonia water tank, an aluminum hydroxide storage tank, a filter press, an ammonia distillation tower, a dephlegmator, a cooler, a concentrated ammonia water storage tank, a gypsum precipitation tank, and an anaerobic biochemical pool, wherein
- an air blower is arranged at a flue gas inlet end at the bottom of the desulfurization spray tower;
- a liquid outlet end at the bottom of the desulfurization spray tower is communicated with a spray nozzle communication pipeline at the top of the desulfurization spray tower through a circulation pipeline I;
- a circulating pump I is arranged on the circulation pipeline I;
- a flue gas outlet end at a top end of the desulfurization spray tower is communicated with a flue gas inlet end of the denitration spray tower through a flue gas conveying pipeline I;
- an ozone outlet end of the ozone generator is communicated with the flue gas conveying pipeline I through an ozone conveying pipeline;
- a liquid inlet at the bottom of the desulfurization spray tower is communicated with a liquid outlet at the bottom of the denitration spray tower through a slurry pipeline I;
- a liquid discharge port at the bottom of the desulfurization spray tower is communicated with a liquid inlet of the slurry storage tank through a slurry pipeline II;
- a liquid outlet of the slurry storage tank is communicated with a liquid inlet of the vacuum filter through a slurry pipeline IV;
- a slurry pump is arranged on the slurry pipeline IV;
- a liquid outlet of the vacuum filter is communicated with a liquid inlet of the ammonia water neutralization tank through a liquid conveying pipeline I;
- a liquid outlet of the ammonia water neutralization tank is communicated with a liquid inlet of the aluminum hydroxide precipitation tank through a liquid conveying pipeline II;
- a liquid outlet end at the top of the aluminum hydroxide precipitation tank is communicated with a liquid inlet of the ammonia water tank through a liquid conveying pipeline III;
- a slurry outlet at the bottom of the aluminum hydroxide precipitation tank is communicated with a feed port of the aluminum hydroxide storage tank through an aluminum hydroxide slurry conveying pipeline;
- the aluminum hydroxide storage tank is communicated with the filter press through a screw filter pump;
- a liquid outlet of the filter press is communicated with a liquid inlet of the ammonia water tank through a liquid conveying pipeline IV;
- a liquid outlet of the ammonia water tank is communicated with the dephlegmator through a liquid conveying pipeline V;
- an ammonia pump is arranged on the liquid conveying pipeline V;
- a liquid outlet of the dephlegmator is communicated with a liquid inlet at the top of the ammonia distillation tower through the slurry pipeline IV;
- a gas outlet at the top of the ammonia distillation tower is communicated with a gas inlet of the dephlegmator through a flue gas conveying pipeline II;
- a gas outlet of the dephlegmator is communicated with an air inlet end of the through a flue gas conveying pipeline III;
- the cooler is communicated with concentrated ammonia water through a slurry pipeline V;
- the concentrated ammonia water is communicated with the ammonia water neutralization tank through a slurry pipeline VI;
- a bottom part of the ammonia distillation tower is communicated with the gypsum precipitation tank through a slurry pipeline VII;
- an outlet of the gypsum precipitation tank is communicated with the anaerobic biochemical pool through a slurry pipeline VIII;
- and a slurry outlet of the anaerobic biochemical pool is communicated with a feed end of the slurry mixing tank through a slurry pipeline IX;
- and
- a liquid outlet end at the bottom of the denitration spray tower is communicated with a spray nozzle communication pipeline at the top of the denitration spray tower through a circulation pipeline II;
- a circulating pump II is arranged on the circulation pipeline II;
- a liquid inlet at the bottom of the denitration spray tower is communicated with a liquid discharge port of the slurry mixing tank through a slurry pipeline III;
- and a feed pump is arranged on the slurry pipeline III.