Iron smelting flue gas treatment method

Abstract

The invention discloses an iron smelting flue gas treatment method. The iron smelting flue gas treatment method comprises the following steps: firstly, dust removal is carried out on flue gas by a dust remover; then, nitric oxide in the flue gas is removed by adopting an SCR method; after the nitric oxide is removed, the flue gas is conveyed into a desulfurization device; the flue gas subjected to desulfurization treatment is discharged into air, wherein the desulfurization device is provided with a nozzle; in a desulfurization process, a mixed solution of hydrogen chloride and hypochlorous acid is sprayed into the desulfurization device, wherein the mol ratio of hydrogen chloride to hypochlorous acid is (5-10) to (3-4); a compound adsorbent is arranged at a flue gas outlet of the desulfurization device and is specifically formed by 20wt%-60wt% of active carbon, 20wt%-40wt% of MCM-41 and 20wt%-30wt% of NaY type zeolite; and a preparation method of the compound adsorbent is a mixing method. By virtue of the method, when more than 80% of denitration efficiency and more than 95% of desulfurization efficiency are reached, more than 80% of demercuration efficiency and more than 95% of dechloridation and defluorination efficiency are reached and partial volatile organic pollution is oxidized and degraded, so that the environment protection standards which are increasingly strict in the future can be met.

Description

technical field [0001] The invention relates to a method for treating iron smelting flue gas. Background technique [0002] The sulfur oxides and nitrogen oxides produced in the process of energy utilization have caused increasingly serious harm to my country's atmospheric environment. In addition, trace amounts of heavy metals such as mercury Hg, HCl, HF and volatile organic pollutants VOC have also increasingly caused harm. people's attention. At present, large-scale treatment and control of sulfur dioxide have been carried out, and the control of nitrogen oxides has also been increasingly put on the agenda. Mercury, chlorine, fluorine, and volatile organic pollutants have not yet been clearly required in coal-fired boilers in my country. With the development of my country's economy and society and the enhancement of people's awareness of environmental protection, these pollutants are bound to be gradually controlled. [0003] At present, the existing desulfurization tech...

AI Technical Summary

Problems solved by technology

The efficiency of mercury removal by fly ash adsorption is low, and it is still in the stage of laboratory research