Abstract
An efficient sintering process was proposed based on the autocatalytic denitrification of the sintered ore. The catalytic denitrification of sintered ore, the effect of double-layer ignition sintering process on the emission reduction in nitrogen oxides, and the impact on the quality of sintered ore were studied. The results showed that the catalyzed reduction of NO with sinter ore as a catalyst has a significant effect; when the airspeed reaches 3000 h−1, the temperature is 500 °C, and the conversion rate of NO can reach 99.58%. The sinter yield of double-layer ignition sintering is increased, solid fuel consumption is slightly reduced, falling strength is slightly increased, and drum strength is slightly decreased. Under the conditions of layer height proportion of 320/400 mm (lower/upper) and ignition time interval of 10 min, the yield, drum strength, shatter strength, and solid fuel consumption reached 61.60%, 54.82%, 46.75%, and 69.55%, respectively. NOx concentration under the 16% baseline oxygen content (c(NOx)’) in the flue gas of double-layer ignition sintering is reduced to a certain extent, and the generation time of NOx is greatly shortened. The double-layer ignition sintering process can reduce the emission of nitrogen oxides in the sintering process under the condition of guaranteeing the quality of sinter, which has great economic and environmental benefits.
Highlights
The nitrogen oxide concentration in flue gas is based on the Nitrogen oxide (NOx) concenIron Oretration under the 16% baseline oxygen
The nitrogen oxide concentration in flue gas is based on the NOx concentration under the 16% baseline oxygen content (c NOx ), and the calculation formula is shown in Equation (2)
In order to explore the strength of sinter catalysis under different reaction temperatures, this experiment studied the influence of different temperatures on the catalytic reduction of NO in sinter under the conditions of particle size of 0.2–1 mm, space velocity ratio of h−1, gas flow rate of 1 L/min, CO concentration of 0.3%, and NO concentration of
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Nitrogen oxide (NOx ) is a major air pollutant [1]. The excess emission of NOx has brought harm and trouble to human beings repeatedly due to its role in the formation of photochemical smog and acid rain [2,3]. The iron and steel industry is one of the major polluters in the industrial field; the NOx emissions from iron and steel industry approximately account for 6% of the total industrial emissions in China [4,5]. Sintering, as one of the most polluting processes in steel production, accounts for about 50%
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