Method and device for treating solid combustion exhaust gas

Abstract

The invention discloses a method and device for treating solid combustion exhaust gas. The method for treating the solid combustion exhaust gas includes the steps of removing at least major amount ofSOX and possibly other pollutants, pre-removing of NOX and removing of NOX and / or other reaction products. The device for treating the solid combustion exhaust gas includes a moving bed reactor for removing SOX, NOX and possibly other pollutants in the solid combustion exhaust gas, a NH3 supply unit and a regeneration unit for an adsorbent; and after air cooled by the adsorbent in the regenerationunit flows out of a cooling section of the regeneration unit, the air can be introduced into a dilution fan in the NH3 supply unit. According to the method and device for treating the solid combustion exhaust gas, simple and convenient production of NH3 can be realized, recycle of gas during the regeneration of the adsorbent is realized, and the gas during regeneration of the adsorbent can be used in the NH3 supply unit.

Description

technical field [0001] The invention relates to the technical field of waste gas treatment, in particular to a method and a device for processing solid combustion waste gas. Background technique [0002] In the combustion of the ore material, the ore material is mixed with solids containing small carbon particles and placed on a sintering belt where the ore material is at least partially combusted during its onward transport, the at least partially combusted material is transported to the discharge end. During the sintering process, the material undergoes a smoldering and at least partial combustion process, whereby a large amount of gas is released, which in addition to the component CO 2 and possible CO, O 2 , H 2 O and / or N 2 It also contains a series of pollutants. In particular, the pollutants are nitrogen oxides (NOx), SO 2 , HCl, dioxins, furans, dusts and sublimable or condensable residues, heavy hydrocarbons and / or heavy metals from smoldering processes. [0...

AI Technical Summary

Problems solved by technology

The current treatment of off-gases from the sinter zone is usually expensive, thereby increasing the overall cost of steel production

In addition, since the fractions of the pollutants in the sinter zone exhaust gas are different and their composition varies greatly with the feed, and because of the different reactions of the pollutants and the purification methods available, multiple purification steps must be taken to remove the different pollutants ingredients

[0004] Patents WO 01 / 17663 and WO 2006 / 084671 A1 disclose a method for purifying sintering waste gas. However, the methods in the above two patents require expensive equipment and consume materials. Therefore, the patent CN 101605589B discloses a method for The method and equipment for purifying sintering waste gas to overcome the above-mentioned problems, but the supply of NH in this patent 3 The unit is more complex and does not fully realize the recycling of resources

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