Comprehensive treatment method for iron ore sintering smoke pollutants

Abstract

The invention provides a comprehensive treatment method for iron ore sintering smoke pollutants. According to the characteristic that the properties of sintering smoke at different positions of a sintering machine are different, the sintering machine is sequentially divided into a section I, a section II, a section II, a section IV and a section V from the machine head to the machine tail. The length of the section I accounts for one twelfth that of the sintering machine. The length of the section II accounts for one fourth to three tenths that of the sintering machine. The length of the section III accounts for one fifth to one fourth that of the sintering machine. The length of the section IV accounts for one fourth of the sintering machine. The length of the section V accounts for one sixth that of the sintering machine. Smoke in the section I, the section III and the section V circulates to a smoke hood of the sintering machine through a circulating flue. The proportion of circulating smoke is 45%-50%. According to the features of the smoke entering the sintering bed layer, the temperature is 200 DEG C-250 DEG C, the content of O2 is greater than or equal to 17%, the content of CO2 is less than or equal to 6%, H2O (g) is less than or equal to 8%, and the content of SO2 is less than or equal to 500 ppm. The smoke in the section II and the smoke in the section IV are treated by a comprehensive activated carbon desulfurization and denitrification system and then discharged.

Description

technical field [0001] The invention relates to a method for energy saving and emission reduction in the iron ore sintering process, in particular to a comprehensive treatment method for iron ore sintering flue gas pollutants. Background technique [0002] The iron ore sintering process is the main source of flue gas pollutants in the iron and steel industry, and its exhaust gas emissions account for 40% of the total exhaust gas in the iron and steel industry. The sintering flue gas is the dust-containing waste gas generated during the high-temperature sintering molding process with the operation of the trolley after the mixture is ignited. Its main characteristics are: ①Due to the influence of air leakage and high return rate, the amount of sintering flue gas is relatively large. Large, about 4000~6000m3 for every 1t of sinter produced 3 smoke. ②The temperature of the sintering flue gas is relatively high, especially in several bellows near the end of sintering. The flue...

AI Technical Summary

Problems solved by technology

④High water vapor content

⑦ SO in the large sintering flue 2 Low concentration, resulting in low desulfurization system efficiency

At the same time, the flue gas circulation technology currently used in the sintering process is mainly developed for one or several flue gas pollutants, and due to the low proportion of flue gas circulation, the emission reduction efficiency of sintering flue gas pollutants is low

Images