Sintering flue gas SCR denitration and vapor removal system and technology

Abstract

The invention relates to a sintering flue gas SCR denitration and vapor removal system. The system comprises a flue gas condensation vapor-removal defogging dedusting tower, a heat exchange device, ahot-blast stove, an ammonium hydroxide evaporator, a dilution fan, an ammonia injection grid, an SCR denitration reaction device and a flue gas exhaust device. The heat exchange device is arranged between the flue gas condensation vapor-removal defogging dedusting tower and the SCR denitration reaction device. The heat exchange device is used for heat exchange on flue gas to be denitrated or denitrated flue gas to change the temperature, an original flue gas outlet of the heat exchange device is connected with a gas inlet of the SCR denitration reaction device through a second main flue, the hot-blast stove and the ammonia injection grid are arranged in sequence in the flowing direction of the flue gas in the second main flue, and the ammonium hydroxide evaporator and the dilution fan arearranged between the ammonia injection grid and a gas outlet of the SCR denitration reaction device. The sintering flue gas SCR denitration and vapor removal system can carry out SCR denitration on desulfurated sintering flue gas while carrying out vapor removal treatment, the effect of purifying sintering flue gas desulfurated with a wet method is improved, and environmental pollution is reduced.

Description

technical field [0001] The invention belongs to the field of sintering flue gas pollutants and flue gas dewhitening control, and in particular relates to a sintering flue gas SCR denitrification and whitening system and process. Background technique [0002] At present, the iron and steel smelting industry is an industry with high energy consumption and heavy pollution. The sintering flue gas produced by the high-temperature sintering process of iron and steel contains a variety of pollutant gases, including particulate matter, NOx and SO2 and other acid gases, and these pollutant gases are one of the main culprits of air pollution. The current "Steel Sintering and Pelletizing Industry Air Pollutant Emission Standard" (GB28662-2012) stipulates that the emission limits of particulate matter, NOx and SO2 in the sintering flue gas are 50mg / m 3 , 200mg / m 3 、300mg / m 3 . However, at present, the control of sintering flue gas is still mainly in the aspects of desulfurization an...

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Problems solved by technology

At the same time, the temperature of the saturated flue gas after wet desulfurization is relatively low. If it is directly discharged from the chimney and mixed with the cold air outside, the water vapor in the flue gas will condense and form a white plume, which will cause more than just visual damage to the atmosphere. pollution, but actual pollution

However, the traditional flue gas denitrification treatment process is difficult to adapt to and cannot meet the new environmental standards, so it is essential for the denitrification transformation of the sintering section of the iron and steel industry

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