The utility model relates to the technical field of boiler
flue gas treatment, in particular to a boiler
flue gas two-stage desulfurization structure which comprises a desulfurization box, a desulfurization mechanism is arranged at the upper end of the inner side of the desulfurization box, and a cleaning mechanism is arranged at the upper end, close to the desulfurization mechanism, of the desulfurization box. According to the
flue gas desulfurization device, the desulfurization box, the rectifying plates, the
circulating pump, the water outlet
pipe, the
water pumping pipe and the atomizing nozzles are matched for use,
flue gas sequentially flows through the rectifying plates, and meanwhile,
lime water sprayed by the atomizing nozzles reversely flows down along the rectifying plates to perform primary desulfurization treatment on the
flue gas; the
flue gas subjected to primary desulfurization is sprayed out from the right side of the rectifying plate at the topmost end and then is subjected to secondary desulfurization treatment by
lime water sprayed out of the atomizing nozzles, and the rectifying plates are arranged in a staggered manner, so that the flowing distance of the flue gas in the desulfurization box is increased, the contact area of the flue gas and the
lime water is increased, and the desulfurization effect is better; and only one circulating
system is used, so that the purpose of saving energy can be achieved.