Sintering flue gas denitrification process based on sintering hot returning ore catalysis

Abstract

The invention relates to a sintering flue gas denitrification process based on sintering hot returning ore catalysis and aims at solving the problems of long denitrification process route, large equipment investment and high operating cost in an existing denitrification process. According to the technical scheme, the sintering flue gas denitrification process comprises that sintering flue gas passes through a sintering bed, a backing material, a grate at the bottom of a sintering machine trolley and an air bellow below the trolley under the action of draft of a high pressure fan to enter a main flue; sintering ore leaves the sintering machine trolley and then is broken by a single roller at the tail of a sintering machine and screened by a heated oscillating screen, an oversize product is hot sintering ore, screen underflow is hot returning ore, and the hot returning ore is fed into a fluidized-bed denitrification reactor through a particulate matter stock bin and is used as a catalyst for reduction and denitrification of the sintering flue gas. The sintering flue gas denitrification process provided by the invention has the advantages that technological process is simple, a denitrification catalyst is not out-purchased, waste heat recovery is high, controllability is good, floor area is small and equipment investment and operating cost are low.

Description

technical field [0001] The invention relates to a flue gas denitrification process in the field of environmental protection, in particular to a sintering flue gas denitrification process based on sintering heat return ore catalysis. Background technique [0002] my country's iron and steel industry has developed rapidly since the 1990s, resulting in a large amount of air pollutants, among which SO 2 And NOx emissions are second only to power plant flue gas. With the advancement of the industrialization process of sintering flue gas desulfurization, the technology continues to mature. During the "Twelfth Five-Year Plan" period, the desulfurization and purification of sintering (pellet) flue gas has been completed nationwide. [0003] In terms of denitrification, activated carbon (coke) adsorption and selective catalytic reduction (S-SCR) are two technologies that can be applied in engineering and have actual performance in sintering flue gas denitrification. However, the s...

AI Technical Summary

Problems solved by technology

However, the one-time investment cost of SCR denitrification technology is high (the catalyst cost accounts for 30-40% of the total investment cost), and the existing SCR flue gas denitrification technology is generally carried out at 350-450°C, which requires a large amount of heat energy for desulfurization. Flue gas heating increases the operating cost of SCR denitrification

Low-temperature denitrification catalysts are mostly noble metals, which are more expensive and prone to oxygen inhibition and sulfur poisoning

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