Dust removal, desulfurization and denitrification integrated treatment device for industrial flue gas

The utility model discloses an industrial flue gas dust removal, desulfurization and denitrification integrated treatment device which comprises a shell, a flue gas outlet and a flue gas inlet are formed in the top end and the bottom end of the shell respectively, and a flue gas inlet pipe is connected to the flue gas inlet of the shell. An inclined partition plate is arranged in the shell and divides the interior of the shell into a reaction cavity and a cooling cavity in the vertical direction, the cooling cavity is filled with cooling liquid, a cooling liquid inlet and a cooling liquid outlet are formed in the positions, corresponding to the cooling cavity, of the shell, and a cooling fan is installed on the position, corresponding to the cooling cavity, of the shell. A cooling coil communicated with the air inlet pipe is arranged in the cooling cavity, a diffusion unit, a spraying head, a filler layer and a demister are sequentially arranged in the reaction cavity from bottom to top, the end, away from th