A wet desulfurization method in iron and steel metallurgy

Abstract

The invention discloses a wet desulphurization method in ferrous metallurgy. The process comprises the following steps: 1, feeding metallurgy fume into a desulphurization device; 2, performing primary spraying to the metallurgy fume in the desulphurization device through spraying, so as to accomplish cooling and initial desulphurization of the fume in the process; 3, enabling metallurgy fume treated in step 2 to rise to a turbulent ball section directly in the desulphurization device. The method is characterized in that the turbulent ball section is composed of three layers in structure including a foam particle packing layer, an alkaline sodium carbonate particle packing layer, and an aluminum oxide particle layer; after passing through the turbulent ball section adopting a three-layered structure, the metallurgy fume is discharged after defogging. The method can achieve a better effect when being applied to the field of wet desulphurization, thereby having remarkable social benefits and economical benefits.

Description

technical field [0001] The invention relates to a wet desulfurization method in iron and steel metallurgy. Background technique [0002] Existing flue gas desulfurization equipment can be divided into two categories, one is packed tower, which has large gas resistance and is easy to scale; the other is plate tower, which has low desulfurization efficiency. The smoke, SOx, NOx and other harmful substances produced by the combustion of fuel in the boiler have seriously polluted the atmosphere and endangered human health. With the development of the national economy and the increase of energy development and utilization, air pollution is also increasing sharply. In order to protect the environment and make the air cleaner, the emission of pollutants must be limited, especially the emission of harmful substances produced by the combustion of fuel in the boiler. [0003] At present, sintering flue gas desulfurization has just started. It mainly refers to the wet flue gas desulf...

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Problems solved by technology

[0003] At present, sintering flue gas desulfurization has just started, mainly referring to wet flue gas desulfurization processes such as power stations. The main desulfurization process is carried out in desulfurization devices such as spray towers, grid towers, and bubble towers, among which spray towers are the most operating , the absorption principle is that the absorbent slurry is sprayed and atomized in the absorption tower, and the SO2 in the flue gas is absorbed during the process of spraying from top to bottom and mixing the flue gas from the bottom of the tower upwards. The main disadvantage is that the flue gas and absorbent slurry It is difficult to fully mix, resulting in low desulfurization efficiency, especially the low sulfur content of sintering flue gas, and the desulfurization efficiency is even more difficult to guarantee; at the same time, the flow rate of the spray tower is low and the equipment is large, so it occupies a large area; for the bubble tower, its process The process is that the flue gas is directly sent into the absorption liquid. The main disadvantage is that both absorption and crystallization occur in the solution pool. The pH value required for absorption is high, while the pH value required for crystallization is low. This contradiction results in incomplete absorption and crystallization. In addition, due to Bubbles are generated during bubbling washing, resulting in low desulfurization efficiency