Corrosion decelerating system for wet desulphurization chimney of sintering machine

Abstract

The invention relates to a corrosion decelerating system for a wet desulphurization chimney of a sintering machine, which comprises a wet desulphurization device, a valve, a chimney, a blower, a circular cooler and a high temperature resistant duster, wherein the circular cooler is provided with temperature sections which comprise a low temperature section, a moderate temperature section and a high temperature section; the temperature sections are respectively connected with the wet desulphurization device and the chimney through pipelines; the blower is arranged on the pipelines; the wet desulphurization device is connected with the valve; and the high temperature resistant duster is arranged on the pipelines in a position near the temperature sections of the circular cooler. In the invention, a heat source for improving the temperature of wet flue gas in desulphurization can use the hot blast cooled in the moderate temperature section of the circular cooler, and also can use the flue gas exhausted from a waste heat boiler of the circular cooler. The system of the invention does not use GGH, the hot blast which achieves an emission standard after dust removal and recovery of waste heat by the circular cooler, or the hot blast in the moderate temperature section of the circular cooler without recovery of waste heat is mixed with wet flue gas after desulphurization for improving the temperature of the wet flue gas after desulphurization, so that the actual effect of decelerating corrosion of the wet desulphurization chimney is achieved, and the overall system is simple and practical.

Description

technical field [0001] The invention relates to the anticorrosion of the wet desulfurization chimney of sintering machine flue gas, which meets the national energy saving and emission reduction requirements, and belongs to the field of iron and steel metallurgy. Project of wet flue gas desulfurization. Background technique [0002] There are many methods for sintering flue gas desulfurization, which can be roughly classified into three categories: wet method, dry method and semi-dry method; relatively speaking, the wet method has the highest desulfurization efficiency. Due to the large-scale sintering machine, the limitations of the dry and semi-dry desulfurization in terms of large flue gas volume, and the fact that the desulfurization efficiency is not as high as that of the wet method, the desulfurization of the sintering machine flue gas will still be dominated by the wet method in the future. [0003] For the wet desulfurization of sintering machine flue gas, due to th...

AI Technical Summary

Problems solved by technology

[0005] Many problems occurred during the use of GGH: ①The equipment is huge and expensive, accounting for more than 15% of the total investment of wet desulfurization equipment; up to 1600Pa), the power consumption of the system is greatly increased; ③ complex soot blowing and cleaning systems are required, and special treatment is required for flushing wastewater; ④ due to leakage, the desulfurization efficiency is reduced by 1% to 2%, and SO 2 The total emissions increase by 10% to 30%; ⑤The cold side of GGH is severely corroded, and anti-corrosion measures must still be taken for the chimney after installing GGH

Long-term practice has proved that the role of GGH in the desulfurization system is not great, but it has brought more negative effects. At present, GGH is no longer built for wet desulfurization, so higher requirements are put forward for the selection of chimney anti-corrosion and anti-corrosion materials. requirements

[0006] At present, the most commonly used chimney anticorrosion in China is scale resin lining and boric acid brick lining. It is generally believed that the service life can reach 10-15 years and 20 years; serious corrosion problems, and some even peeled off the lining, which affected the safe operation of wet desulfurization facilities

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