Comprehensive dust removal and desulfurization purification equipment for flue gas in cupola furnace

The utility model relates to the field of environment-friendly equipment of an industrial furnace, in particular relates to a comprehensive dust removal and desulfurization purification equipment for flue gas in a cupola furnace, and can solve the problem that existing equipment used for purifying the flue gas and harmful gas respectively has different defects. The equipment provided by the utility model comprises a cyclone dust remover, a bag-type dust remover, a flue gas desulfurization device employing a double-alkali method, and a normal-pressure hot water chimney which is connected with a flue gas outlet of the cupola furnace, wherein a circulating water jacket is arranged outside the normal-pressure hot water chimney; the normal-pressure hot water chimney is connected with the cyclone dust remover through a transition connector; a flue gas outlet of the cyclone dust remover is communicated with a flue gas inlet II through an underground flue; a flue gas outlet II of the underground flue is connected wit