Low-temperature synchronous denitration and desulfurization equipment and process for flue gas

The invention belongs to the field of flue gas purification technology, and particularly relates to low-temperature synchronous denitration and desulfurization equipment and process for flue gas. The low-temperature synchronous denitration and desulfurization equipment for the flue gas comprises a residual heat boiler (1), a reaction tower (3), an absorption tower (4) and a water circulation system (5); the residual heat boiler (1) is arranged at the outlet end of the flue gas of the equipment, the reaction tower (3) is arranged at the flue gas outlet end of the residual heat boiler (1), the reaction tower (3) is arranged at the flue gas outlet end, the reaction tower (3) is provided with a flue gas inlet I (10) and a flue gas outlet I (11); the reaction tower (3) is internally provided with an ammonia steam injection system (5), an inlet of the ammonia steam injection system (5) is formed between the flue gas inlet I (10) and the flue gas outlet I (11); the absorption tower (4) is provided with a flue gas in