Dust removal device and dust removal method for sintering flue gas by shunted and graded desulfurization

Abstract

The invention relates to a dust removal device for sintering flue gas by shunted and graded desulfurization. The device comprises an air bellow set for sintering machines, a desulfurization tower and a blast furnace gas diffusion tower, wherein the air bellow set for sintering machines is connected with a flue gas inlet of the desulfurization tower, a flue gas outlet of the desulfurization tower and an inlet of the blast furnace gas diffusion tower are connected together, the top of the blast furnace gas diffusion tower is provided with an outlet, and a burner is arranged at the outlet and on the outside of the blast furnace gas diffusion tower. By using the device disclosed by the invention, a whole flue gas treatment can be performed, so that the emission of sulfur dioxide reaches the standard, and the pollution to the environment caused by dioxin in flue gas can be eliminated as far as possible; high-sulfur flue gas and low-sulfur flue gas, after being shunted, enter a same desulfurization tower to be subjected to graded desulfurization treatment, so that compared with a traditional mode of mixing high-sulfur flue gas and low-sulfur flue gas firstly and then carrying out whole flue gas treatment on the obtained mixture, the mode according to the invention has the advantages that the size of the desulfurization tower is smaller, the manufacturing cost is lower, and the investment and running costs of the desulfurization tower are reduced.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy sintering flue gas purification, in particular to a split-flow and graded desulfurization and dust removal device and a dust removal method for iron and steel metallurgy sintering flue gas. Background technique [0002] During the "Twelfth Five-Year Plan" period, my country has clearly required that the iron and steel industry achieve full desulfurization. Sintering flue gas desulfurization has always been the focus of environmental governance in the iron and steel industry. The composition of sintering flue gas in my country's iron and steel industry is complex and fluctuates greatly. It has the following characteristics: First, the amount of flue gas is large, and the flue gas produced by one ton of sintering 3 ; Second, the concentration of sulfur dioxide varies greatly, ranging from 400 to 5000mg / Nm 3 The third is that the temperature changes greatly, generally from 80°C to 180°C; the...

AI Technical Summary

Problems solved by technology

(2) Flue gas circulation, so that the generated flue gas re-enters the sintering layer, reducing the amount of dioxins and other pollutants; (3) Rapid cooling, so that the flue gas is rapidly cooled from the temperature range of 250 to 450 degrees to below 200 degrees; (4) Activated carbon / activated lignite adsorption combined with bag filter has the disadvantage of increased smoke load, and it is difficult to regenerate and treat activated carbon after adsorption; (5) Catalytic reduction by catalyst oxidizes dioxin to generate CO at low temperature 2 , hydrated HCl and other inorganic substances, the disadvantage is that the catalyst is expensive and prone to poisoning and clogging

Images