Device and method for removing sulphur dioxide and dioxin from sintering flue gas

Abstract

The invention relates to a device and method for removing sulphur dioxide and dioxin from sintering flue gas. The device comprises a circulating fluid bed adsorption tower (2) and a bag-type dust collector (13), wherein a desulphurizer bin (3) and a water spray nozzle are arranged at the bottom of the circulating fluid bed adsorption tower (2); a cyclone separator (6) and a flue duct (8) are sequentially arranged between the top of the circulating fluid bed adsorption tower (2) and the top of the bag-type dust collector (13) along the flowing direction of flue gas; and a plurality of activated carbon spray nozzles (12) are arranged at one end of the flue duct (8) adjacent to the bag-type dust collector (13) in the direction opposite to the flowing direction of the flue gas, and are communicated with an activated carbon bin (10). The device and method for removing sulphur dioxide and dioxin from sintering flue gas, provided by the invention, have the advantages that the sulphur dioxide and the dioxin are separately removed, the influence of the sulphur dioxide on absorption of the dioxin by activated carbon in the flue gas is reduced, and the efficiency of removing the dioxin is increased; and due to the adoption of spiral fins (9) in the flue duct, gas-solid mass transfer of the flue gas and the activated carbon is strengthened, and the efficiency of removing the dioxin from the flue gas can be obviously improved.

Description

technical field [0001] The invention relates to the field of sintering flue gas desulfurization, in particular, the invention relates to a device and method for removing sulfur dioxide and dioxins from sintering flue gas. Background technique [0002] The iron and steel industry is a pillar industry of my country's national economy and has made important contributions to the advancement and development of industrialization and urbanization. But at the same time, the environmental protection level of my country's iron and steel industry is low, and the discharge of pollutants remains high, which has seriously restricted the improvement of the overall competitiveness of the iron and steel industry. Typical pollutants in the exhaust gas emitted by iron and steel enterprises mainly include dust, SO 2 , dioxin-like pollutants, etc. Among these pollutants, more than 70% of SO 2 , 90% of atmospheric dioxin-like pollutant emissions come from steel sintering machines. Therefore, t...

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Problems solved by technology

The main problem of this process is that the desulfurization and the removal of dioxin-like pollutants are completed in the same reaction device, and the activated carbon that adsorbs dioxin-like pollutants is mixed with the desulfurization by-products. Since the desulfurization by-products introduce dioxin-like pollutants , so that the by-products of desulfurization cannot be used as building materials. At present, there is no other way to deal with them. A large number of by-products produced by the process can only be landfilled.

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