Flue gas desulfurization process suitable for sintering machine of steel mill

Abstract

The invention discloses process technology suitable for removing a sulfur dioxide byproduct, namely, ammonium sulfate chemical fertilizer in flue gas produced by a sintering machine of a steel mill and suitable for the characteristics of large sintering flue gas amount, large flue temperature fluctuation, high moisture content, high dust content and the like. The process comprises the following steps of: allowing sintering flue gas to enter from the middle of an absorption tower, wherein the flue gas is reversely contacted with absorption liquid; removing sulfur dioxide from the flue gas in acontacting process; exhausting the flue gas through a chimney on the top of the tower after the flue gas flows through a demister on the top of the tower; introducing compressed air and ammonia waterinto the absorption liquid, wherein ammonium sulfate in solution is saturated and 5 percent of crystal is separated out along with continuous absorbing and oxidizing processes; and rotating, filtering and drying ammonium sulfate crystal-containing suspension to obtain a finished product. Since the absorption, oxidation and condensation of the sintering flue gas are completed in the absorption tower at the same time, the process has the characteristics of refined flow, high desulfurization efficiency and high byproduct quality.

Description

Technical field: [0001] The invention relates to the desulfurization and denitrification technology for air pollution control in the field of environmental protection, in particular to a technology suitable for flue gas desulfurization of sintering machines in steel mills. Background technique: [0002] The iron and steel industry is a pillar industry of my country's national economy and has made important contributions to the advancement and development of my country's industrialization and urbanization. The iron and steel industry is also a major pollutant emitter. Sintering production is an important process unit of modern iron and steel industry production. During the sintering process, a large amount of waste gas is emitted into the air pollutants, mainly including dust, sulfur dioxide, nitrogen oxides and harmful heavy metals, etc., which contribute as much as 40% to 60% to the emission of sulfur dioxide in the iron and steel industry. At present, the control of sinteri...

AI Technical Summary

Problems solved by technology

[0024] Aiming at the problems existing in the prior art, the present invention proposes a process suitable for flue gas desulfurization of sintering machines in steel mills to solve the characteristics of large sintering flue gas volume, large fluctuating flue gas temperature, high moisture content, and high dust content.

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